Bryant Heat Pump 286B User Manual

286B (2 -- 5 TONS)  
289B (3 TON TROPHY)  
EVOLUTIONt SERIES 2--STAGE HEAT PUMP  
R
WITH PURON REFRIGERANT  
Installation Instructions  
Indoor Thermostat Control Options  
SAFETY CONSIDERATIONS  
Standard  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause death, personal injury, or property  
damage. Consult a qualified installer, service agency, or your  
distributor or branch for information or assistance. The qualified  
installer or agency must use factory--authorized kits or accessories  
when modifying this product. Refer to the individual instructions  
packaged with the kits or accessories when installing.  
Evolution  
Control  
2 --- s t a g e  
Model  
Thermostat  
286B / 289B  
Yes  
Yes  
INSTALLATION RECOMMENDATIONS  
Follow all safety codes. Wear safety glasses, protective clothing,  
and work gloves. Use quenching cloth for brazing operations.  
Have fire extinguisher available. Read these instructions  
thoroughly and follow all warnings or cautions included in  
literature and attached to the unit. Consult local building codes and  
current editions of the National Electrical Code ( NEC ) NFPA 70.  
In Canada, refer to current editions of the Canadian electrical code  
CSA 22.1.  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
1. Locate unit away from windows, patios, decks, etc. where  
unit operation sound may disturb customer.  
2. Ensure that vapor and liquid tube diameters are appropriate  
for unit capacity.  
3. Run refrigerant tubes as directly as possible by avoiding un-  
necessary turns and bends.  
!
!
Recognize safety information. This is the safety--alert symbol  
4. Leave some slack between structure and unit to absorb vi-  
bration.  
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury. Understand  
these signal words; DANGER, WARNING, and CAUTION. These  
words are used with the safety--alert symbol. DANGER identifies  
the most serious hazards which will result in severe personal injury  
or death. WARNING signifies hazards which could result in  
personal injury or death. CAUTION is used to identify unsafe  
practices which would result in minor personal injury or product  
and property damage. NOTE is used to highlight suggestions  
which will result in enhanced installation, reliability, or operation.  
5. When passing refrigerant tubes through the wall, seal open-  
ing with RTV or other pliable silicon--based caulk. (See Fig.  
1.)  
6. Avoid direct tubing contact with water pipes, duct work,  
floor joists, wall studs, floors, and walls.  
7. Do not suspend refrigerant tubing from joists and studs with  
a rigid wire or strap which comes in direct contact with  
tubing.(See Fig. 1.)  
8. Ensure that tubing insulation is pliable and completely sur-  
rounds vapor tube.  
!
WARNING  
9. When necessary, use hanger straps which are 1 in. wide and  
conform to shape of tubing insulation. (See Fig. 1.)  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
10. Isolate hanger straps from insulation by using metal sleeves  
bent to conform to shape of insulation.  
Before installing, modifying, or servicing system, main  
electrical disconnect switch must be in the OFF position and  
install a lockout tag. There may be more than 1 disconnect  
switch. Lock out and tag switch with a suitable warning label.  
When outdoor unit is connected to factory--approved indoor unit,  
outdoor unit contains system refrigerant charge for operation with  
AHRI rated indoor unit when connected by 15 ft. (4.57 m) of  
field--supplied or factory accessory tubing. For proper unit  
operation, check refrigerant charge using charging information  
located on control box cover and/or in the Check Charge section of  
this instruction.  
!
CAUTION  
CUT HAZARD  
IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all  
residential applications including long line applications.  
Failure to follow this caution may result in personal injury.  
Sheet metal parts may have sharp edges or burrs. Use care and  
wear appropriate protective clothing and gloves when  
handling parts.  
IMPORTANT: Always install the factory--supplied liquid--line  
filter drier. Obtain replacement filter driers from your distributor or  
branch.  
 
Outdoor units may be connected to indoor section using accessory  
tubing package or field--supplied refrigerant grade tubing of correct  
size and condition. For tubing requirements beyond 80 ft. (24.38  
m), substantial capacity and performance losses can occur.  
Following the recommendations in the Residential Piping and  
Long--Line Guideline will reduce these losses. Refer to Table 1 for  
field tubing diameters. Refer to Table 2 for accessory requirements.  
Make Piping Connections  
!
WARNING  
PERSONAL INJURY AND UNIT DAMAGE  
HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Outdoor Unit Connected to Factory-Approved Indoor  
Unit  
Outdoor unit contains correct system refrigerant charge for  
operation with factory--approved, AHRI--rated indoor unit with  
highest sales volume when connected by 15 ft. (4.57 m) of  
field--supplied or factory--accessory tubing, and factory--supplied  
filter drier. Check refrigerant charge for maximum efficiency.  
Relieve pressure and recover all refrigerant before system  
repair or final unit disposal. Use all service ports and open  
all flow--control devices, including solenoid valves.  
!
CAUTION  
NOTE: If the indoor furnace coil width is more than the furnace  
casing width, refer to the indoor coil Installation Instructions for  
transition requirements.  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Table 1 – Refrigerant Connections and Recommended Liquid  
and Vapor Tube Diameters (in.)  
Do not leave system open to atmosphere any longer than  
minimum required for installation. POE oil in compressor is  
extremely susceptible to moisture absorption. Always keep  
ends of tubing sealed during installation.  
LIQUID  
RATED VAPOR*  
Connection  
& Max. Tube  
Diameter  
UNIT SIZE  
Connection  
Tube  
Diameter  
Diameter  
024  
036  
048  
060  
3/8  
3/8  
3/8  
3/8  
3/4  
7/8  
7/8  
7/8  
3/4  
7/8  
1-1/8  
1-1/8  
!
CAUTION  
*
Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for  
performance data when using different size and length linesets.  
UNIT DAMAGE HAZARD  
Notes:  
Failure to follow this caution may result in equipment  
damage or improper operation.  
1. Do not apply capillary tube or fixed orifice indoor coils to these units.  
2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m)  
horizontal or 20 ft. (6.1 m) vertical differential 250 ft. (76.2 m) Total  
Equivalent Length), refer to the Residential Piping and Longline Guide  
line--- Air Conditioners and Heat Pumps using Puron refrigerant.  
If ANY refrigerant tubing is buried, provide a 6 in. vertical  
rise at service valve. Refrigerant tubing lengths up to 36 in.  
(914.4 mm) may be buried without further special  
consideration. Do not bury lines longer than 36 in. (914.4  
mm).  
Table 2 – Accessory Usage  
REQUIRED FOR  
LO W --- A M B I E N T C O O L I N G  
APPLICATIONS  
REQUIRED FOR SEA  
REQUIRED FOR LONG LINE  
COAST APPLICATIONS  
ACCESSORY  
APPLICATIONS*  
(Within 2 miles/3.22 km)  
(Below 55°F/12.8_C)  
Compressor Start Assist  
Crankcase Heater  
No  
Yes  
No  
Standard  
Standard  
Standard  
Standard with Evolutiont Control  
(Low Ambient not allowed with non---  
communicating thermostat)  
Evaporator Freeze Protection  
Liquid---Line Solenoid Valve  
Low---Ambient Control  
No  
No  
No  
No  
Yes  
No  
No  
Standard with Evolution Control  
(Low ambient not allowed with non---  
communicating thermostat)  
Puron Refrigerant Balance Port  
H a r d --- S h u t O f f T X V  
Yes{  
Yes{  
Yes{  
Support Feet  
Recommended  
Recommended  
No  
*
For tubing set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (total equivalent length), refer to the Long  
Line Guideline—Air Conditioners and Heat Pumps using Puron® Refrigerant.  
{
Required on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.  
3
 
Install Liquid-Line Filter Drier Indoor  
Sweat Connections  
!
!
CAUTION  
WARNING  
UNIT DAMAGE HAZARD  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Failure to follow this warning could result in personal injury  
or equipment damage.  
S Use a brazing shield  
S Wrap service valves with wet cloth or heat sink material.  
PuronR refrigerant systems operate at higher pressures than  
standard R--22 systems. Do not use R--22 service equipment  
or components on PuronR refrigerant equipment.  
Use refrigerant grade tubing. Service valves are closed from factory  
and ready for brazing. After wrapping service valve with a wet  
cloth, braze sweat connections using industry accepted methods  
and materials. Consult local code requirements. Refrigerant tubing  
and indoor coil are now ready for leak testing. This check should  
include all field and factory joints.  
Refer to Fig. 3 and install filter drier as follows:  
1. Braze 5--in. (127 mm) liquid tube to the indoor coil.  
2. Wrap filter drier with damp cloth.  
3. Braze filter drier to above 5--in. (127 mm) liquid tube. Flow  
arrow must point towards indoor coil.  
4. Connect and braze liquid refrigerant tube to the filter drier.  
Evacuate Refrigerant Tubing and Indoor Coil  
!
CAUTION  
!
CAUTION  
UNIT DAMAGE HAZARD  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Failure to follow this caution may result in equipment damage  
or improper operation.  
Never use the system compressor as a vacuum pump.  
Installation of filter drier in liquid line is required.  
Refrigerant tubes and indoor coil should be evacuated using the  
recommended deep vacuum method of 500 microns. The alternate  
triple evacuation method may be used. See Service Manual for  
triple evacuation method. Always break a vacuum with dry  
nitrogen.  
Deep Vacuum Method  
The deep vacuum method requires a vacuum pump capable of  
pulling a vacuum of 500 microns and a vacuum gauge capable of  
accurately measuring this vacuum depth. The deep vacuum method  
is the most positive way of assuring a system is free of air and  
liquid water. (See Fig. 4)  
5000  
4500  
4000  
A05227  
LEAK IN  
3500  
SYSTEM  
Fig. 3 -- Liquid--Line Filter Drier  
3000  
2500  
2000  
1500  
1000  
Refrigerant Tubing connection Outdoor  
Connect vapor tube to fitting on outdoor unit vapor service valves  
(see Table 1).  
VACUUM TIGHT  
TOO WET  
Install Adapter Tube  
TIGHT  
500  
DRY SYSTEM  
1. Remove plastic retainer holding outdoor piston in liquid  
service valve.  
0
1
2
3
4
5
6
7
MINUTES  
2. Check outdoor piston size with matching number listed on  
unit rating plate.  
3. Locate plastic bag taped to unit containing adapter tube.  
A95424  
Fig. 4 -- Deep Vacuum Graph  
4. Remove TeflonR  
washer from bag and install on open  
Final Tubing Check  
end of liquid service valve.  
IMPORTANT: Check to be certain factory tubing on both indoor  
and outdoor unit has not shifted during shipment. Ensure tubes are  
not rubbing against each other or any sheet metal. Pay close  
attention to feeder tubes, making sure wire ties on feeder tubes are  
secure and tight.  
5. Remove adapter tube from bag and connect threaded nut to  
liquid service valve. Tighten nut finger tight and then with  
wrench tighten an additional 1/2 turn (15 ft--lb).  
DO NOT OVERTIGHTEN!  
4
 
Connect Control Wiring  
Make Electrical Connections  
Route low voltage control wires through control wiring grommet  
and connect leads to control board.  
!
WARNING  
Connect to Evolution connections ABCD only when Evolution  
User Interface is available.  
ELECTRICAL SHOCK HAZARD  
Standard non--communicating thermostat connections are possible  
when you connect to standard thermostat connections R, C, W, Y1,  
Y2, and O. Refer to wiring label for further clarification.  
Failure to follow this warning could result in personal  
injury or death.  
Do not supply power to unit with compressor terminal box  
cover removed.  
General Information  
Use No. 18 AWG color--coded, insulated (35°C minimum) wire for  
all installations.  
Be sure field wiring complies with local and national fire, safety,  
and electrical codes, and voltage to system is within limits shown  
on unit rating plate. Contact local power company for correction of  
improper voltage. See unit rating plate for recommended circuit  
protection device.  
All wiring must be NEC Class 1 and must be separated from  
incoming power leads.  
Use furnace transformer, fan coil transformer, or accessory  
transformer for control power, 24v/40va minimum. The outdoor  
unit requires a minimum of 27va/24vac control power.  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating plate. Do not  
install unit in system where voltage may fluctuate above or below  
permissible limits.  
Final Wiring Check  
IMPORTANT: Check factory wiring and field wire connections  
to ensure terminations are secured properly. Check wire routing to  
ensure wires are not in contact with tubing, sheet metal, etc.  
NOTE: Use copper wire only between disconnect switch and unit.  
Compressor Crankcase Heater  
Furnish power to crankcase heater a minimum of 24 hr before  
starting unit. To furnish power to heater only, set thermostat to  
OFF and close electrical disconnect to outdoor unit.  
NOTE: Install branch circuit disconnect of adequate size per NEC  
to handle unit starting current. Locate disconnect within sight from  
and readily accessible from unit, per Section 440--14 of NEC.  
Route Ground and Power Wires  
Airflow Setup for Evolution Control Furnace or  
FE Fan Coil (communicating)  
When using an Evolution User Interface, airflow is automatically  
selected based on equipment size. See User Interface Installation  
Instructions for available adjustments.  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
!
WARNING  
Airflow Selections (ECM Furnaces-- non commu-  
nicating)  
The ECM Furnaces provide blower operation to match the  
capacities of the compressor during high and low stage cooling  
operation. Tap selections on the furnace control board enable the  
installing technician to select the proper airflows for each stage of  
cooling. Below is a brief summary of the furnace airflow  
configurations  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
The unit cabinet must have an uninterrupted or unbroken  
ground to minimize personal injury if an electrical fault  
should occur. The ground may consist of electrical wire or  
metal conduit when installed in accordance with existing  
electrical codes.  
1. The Y2 call for high stage cooling energizes the “Cool” tap  
on the control board. The grey wire from cool tap is connec-  
ted to tap 5 on the motor. Refer to the furnace Product Data  
to find the corresponding airflow. If the airflow setting for  
high cooling needs to be switched from tap 5 to a different  
tap, jumper a connection from the cool tap to the desired tap  
so that the Y2 signal is communicated via the cool tap to the  
desired speed tap.  
Connect Ground and Power Wires  
Connect ground wire to ground connection in control box for  
safety. Connect power wiring to contactor as shown in Fig. 5.  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
CONTACTOR  
2. The Y1 call for low stage cooling energizes the “Fan” tap  
on the control board. The red wire from the fan tap is con-  
nected to tap 1 on the motor. Refer to the furnace Product  
Data to find the corresponding airflow. If the airflow setting  
for low cooling needs to be switched from tap 1 to a differ-  
ent tap, jumper a connection from the Fan tap to the desired  
tap so that the Y1 signal is communicated via the Fan tap to  
the desired speed tap. The Y1 setting will also govern the  
continuous fan airflow for the furnace.  
FIELD POWER  
WIRING  
BLUE  
3 PHASE ONLY  
FIELD GROUND  
WIRING  
GROUND  
LUG  
A91056  
Fig. 5 -- Line Power Connections  
Refer to the furnace literature for further details.  
5
 
Airflow Selection for Variable Speed Furnaces  
(non--communicating)  
The variable speed furnaces provide blower operation to match the  
capacities of the compressor during high and low stage cooling  
operation. The furnace control board allows the installing  
technician to select the proper airflows for each stage of cooling.  
Below is a summary of required adjustments. See furnace  
installation instructions for more details:  
!
CAUTION  
PERSONAL INJURY HAZARD  
Failure to follow this caution may result in personal injury.  
Wear safety glasses, protective clothing, and gloves when  
handling refrigerant.  
1. Turn SW1----5 ON for 400 CFM/ton airflow or OFF for 350  
CFM/ton airflow. Factory default is OFF.  
!
CAUTION  
2. The A/C DIP switch setting determines airflow during high  
stage cooling operation. Select the A/C DIP switch setting  
corresponding to the available airflow shown in the furnace  
Installation Instructions that most closely matches the re-  
quired airflow shown in the air conditioning Product Data  
for HIGH speed.  
3. The CF DIP switch setting determines airflow during low  
stage cooling operation. Select the CF DIP switch setting  
corresponding to the available airflow shown in the furnace  
installation instructions that most closely matches the re-  
quired airflow shown in the air conditioning Product Data  
for LOW speed. If a higher or lower continuous fan speed is  
desired, the continuous fan speed can be changed using the  
fan switch on the thermostat. Refer to the furnace Installa-  
tion Instructions for details of how to use this feature.  
ENVIRONMENTAL HAZARD  
Failure to follow this caution may result in environmental  
damage.  
Federal regulations require that you do not vent  
refrigerant to the atmosphere. Recover during system  
repair or final unit disposal.  
Follow these steps to properly start up the system:  
1. After system is evacuated, fully open liquid and vapor ser-  
vice valves.  
2. Close electrical disconnects to energize system.  
3. Set room thermostat or User Interface at desired temperat-  
ure. Be sure set point is below indoor ambient temperature  
and is set low enough to energize desired stage.  
Airflow Selection for FV4C Fan Coils Using  
Non--Comm. (Non--Evolution) Thermostats  
4. Set room thermostat or User Interface to HEAT or COOL  
and fan control to AUTO or ON, as desired. Wait for appro-  
priate time delay(s). Operate unit for 15 minutes. Check re-  
frigerant charge.  
The FV4C provides high-- and low--stage blower operation to  
match the capacities of compressor at high-- and low--stage. To  
select recommended airflow, refer to FV4C Installation  
Instructions. The FV4C utilizes an Easy Select control board that  
allows the installing technician to select proper airflows. For  
adjustments to control board, select appropriate HP SIZE and CFM  
ADJUST setting. This fan coil has an adjustable blower off delay  
factory set at 90 sec for high-- and low--stage blower operation.  
NOTE:  
Systems using only  
a
non--communicating  
(non--Evolution) thermostat, Bryant electronic thermostats are  
equipped with a 15--minute staging timer. This timer prevents the  
two--stage system from operating at high stage until unit has been  
operating in low stage for 15 minutes, unless there is at least a ±5°F  
(±2.8°C) difference between room temperature and thermostat set  
point. To force high stage (after a minimum of 2 minutes in low  
stage), adjust the set point at least ±5°F (±2.8°C) below room  
ambient.  
When using a communicating (Evolution) control, dipswitch  
adjustments are not necessary. Airflows are determined by  
Evolution Control setup. The fan coil is the FE4A.  
For other combinations of equipment consult Product Data Digest.  
System Functions And Sequence Of Operation  
Install Accessories  
Refer to the individual instructions packaged with kits or  
accessories when installing.  
When using a communicating control with the fan coil or the  
furnace, dip switch adjustments are not necessary. The outdoor  
unit configuration and the indoor airflows are determined by  
communicating control setup.  
The 286B/289B models utilize either an Evolution  
Communicating User Interface or a 2-stage cooling indoor  
thermostat. With a call for first stage cooling, the outdoor fan and  
low-stage compressor are energized. If low-stage cannot satisfy  
cooling demand, high-stage is energized by the second stage of  
indoor thermostat. After second stage is satisfied, the unit returns to  
low-stage operation until first stage is satisfied or until second stage  
is required again.  
Start--Up  
When both first stage and second stage cooling are satisfied, the  
compressor will shut off. When a 2-stage unit is operating at  
low-stage, system vapor (suction) pressure will be higher than a  
standard single-stage system or high-stage operation.  
When the outdoor ambient is more the 100_F (37.8_C), the  
outdoor fan will continue to run for one minute after compressor  
shuts off. This reduces pressure differential for easier starting in  
the next cycle.  
!
CAUTION  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this caution may result in minor personal  
injury, equipment damage or improper operation.  
Observe the following:  
1. Do not overcharge system with refrigerant.  
2. Do not operate unit in a vacuum or at negative pressure.  
3. Do not disable low pressure switch  
4. Dome temperatures may be hot.  
With non--communicating (non--Evolution) systems, with first  
stage of cooling, Y1 and O are powered on; and with second stage  
of cooling, Y1, Y2, and O are on. For these systems, with first  
stage of heating Y1 is on and for second stage of heating, Y1 and  
Y2 are on. When the reversing valve is energized, O is powered  
on.  
6
 
Communication and Status Function Lights  
Time Delays  
For Evolution Control only, Green communications (COMM)  
Light  
The unit time delays include:  
S Five minute time delay to start cooling or heating operation  
when there is a call from the thermostat or user interface. To  
bypass this feature, momentarily short and release Forced  
Defrost pins.  
S Five minute compressor re--cycle delay on return from a  
brown--out condition.  
S Two minute time delay to return to standby operation from last  
valid communication (with Evolution only).  
S One minute time delay of outdoor fan at termination of cooling  
mode when outdoor ambient is greater than or equal to 100_F  
(37.78_C).  
S Fifteen second delay at termination of defrost before the  
auxiliary heat (W1) is de--energized.  
A green LED (COMM light) on the outdoor board (see Fig. 6)  
indicates successful communication with the other system  
products. The green LED will remain OFF until communication is  
established. Once a valid command is received, the green LED will  
turn ON continuously. If no communication is received within 2  
minutes, the LED will be turned OFF until the next valid  
communication.  
Amber Status Light  
An amber colored STATUS light is used to display the operation  
mode and fault codes as specified in the troubleshooting section.  
See Table 5 for codes and definitions.  
NOTE: Only one code will be displayed on the outdoor unit  
control board (the most recent, with the highest priority).  
S Twenty second delay at termination of defrost before the outdoor  
fan is energized (unless fan delay defeated).  
S Thirty second compressor delay when quiet shift enabled.  
S There is no delay between staging from low to high and from  
high to low capacity. The compressor will change from low to  
high and from high to low capacity “on the fly” to meet the  
demand.  
Crankcase Heater Operation  
The crankcase heater is energized during off cycle below 65°F  
(18.33°C).  
Outdoor Fan Motor Operation  
The outdoor unit control energizes the outdoor fan any time the  
compressor is operating except for low--ambient cooling operation.  
The outdoor fan remains energized if a pressure switch or  
compressor overload should open. Outdoor fan motor will  
continue to operate for one minute after the compressor shuts off  
when the outdoor ambient is greater than or equal to 100_F  
(37.78_C) to reduce pressure differential for easier starting on next  
cycle.  
Compressor Operation:  
The basic scroll design has been modified with the addition of an  
internal unloading mechanism that opens a by--pass port in the first  
compression pocket, effectively reducing the displacement of the  
scroll. The opening and closing of the by--pass port is controlled  
by an internal electrically operated solenoid. The modulated scroll  
uses a single step of unloading to go from full capacity to  
approximately 67% capacity.  
On 286B models -- The outdoor fan motor is a PSC type. A fan  
relay on the control board turns the fan off and on by opening and  
closing a high voltage circuit to the motor. It does not change  
speeds between low and high stage operation.  
On 289B models -- The outdoor fan is an ECM type. The motor  
control is continuously powered with high voltage. The motor  
speed is determined by electrical pulses provided by the PWM  
outputs on the control board. The ECM motor RPM adjusts to  
outdoor conditions as described in Table 3. The PWM output can  
be measured between the PWM1 and PWM2 terminals on the  
circuit board with a volt meter set to DC volts.  
A single speed, high efficiency motor continues to run while the  
scroll modulates between the two capacity steps. Modulation is  
achieved by venting a portion of the gas in the first suction pocket  
back to the low side of the compressor, thereby reducing the  
effective displacement of the compressor.  
Full capacity is achieved by blocking these vents, thus increasing  
the displacement to 100%. A DC solenoid in the compressor  
controlled by a rectified 24 volt AC signal in the external solenoid  
plug moves the slider ring that covers and uncovers these vents.  
The vent covers are arranged in such a manner that the compressor  
operates at approximately 67% capacity when the solenoid is not  
energized and 100% capacity when the solenoid is energized. The  
loading and unloading of the two step scroll is done ”on the fly”  
without shutting off the motor between steps.  
Table 3 – Outdoor Fan Motor PWM  
Outdoor Temp (DC volts, Tolerance +/-- 2%)  
L O W --- &  
L O W --- S T A G E  
H I G H --- S T A G E  
MODEL  
HIGH---STAGE  
(OAT104_F/40_C)  
(OAT104_F/40_C)  
NOTE: 67% compressor capacity translates to approximately  
(OAT>104_F/40_C)  
75% cooling or heating capacity at the indoor coil.  
289B036  
9.06  
10.23  
11.90  
NOTE:  
The compressor will always start unloaded and stay unloaded for  
five seconds even when the thermostat is calling for high stage  
capacity.  
For 289B models in low---ambient cooling, the PWM output for both high---  
and low---stage equals the value for low---stage operation below 55_F  
(12.8_C).  
In low ambient cooling (below 55_F/12.78_C) on 286B and 289B  
models, the control board cycles the fan off and on.  
7
 
MODEL  
PLUG  
MODEL  
PLUG  
UTILITY RELAY  
*
UTILITY SIGNAL  
OPEN RELAY  
LLS  
Liquid Line Solenoid  
*
SUPPLIED BY UTILITY PROVIDER  
A06525  
A06526  
Fig. 6 -- 2--Stage Control Board  
S When defrost time 3--5 minutes, the next defrost interval=90  
minutes.  
S When defrost time 5--7 minutes, the next defrost interval=60  
minutes.  
S When defrost time >7 minutes, the next defrost interval=30  
minutes.  
The control board accumulates compressor run time. As the  
accumulated run time approaches the selected defrost interval time,  
the control board monitors the coil temperature sensor for a defrost  
demand. If a defrost demand exists, a defrost cycle will be initiated  
at the end of the selected time interval. A defrost demand exists  
when the coil temperature is at or below 32_F (0_C) for 4 minutes  
during the interval.  
The defrost cycle is terminated when the coil temperature reaches  
65_F (18.33_C)or 10 minutes has passed. When OAT is > 25°F  
(--3.9°C), defrost will occur in low or high stage as demanded by  
the thermostat or User Interface.  
GENERAL INFORMATION  
Evolution Controlled low ambient cooling:  
This unit is capable of low ambient cooling down to 0°F (--17.8°C)  
without a kit ONLY when using an Evolution Control. A low  
ambient kit is not required for Evolution controlled low ambient  
operation. The Evolution Control provides an automatic  
evaporator freeze thermostat. Low ambient cooling must be  
enabled in the User Interface setup. Fan may not begin to cycle  
until about 40°F (4.4°C) OAT. Fan will cycle based on coil and  
outdoor air temperature.  
Evolution controlled low ambient mode operates as follows:  
S Fan is OFF when outdoor coil temperature is less than outdoor air  
temperature (+ 3 _F/1.7_C) or outdoor fan has been ON for 30  
minutes. (Fan is turned off to allow refrigerant system to stabilize.)  
S Fan is ON when outdoor coil temperature is less than outdoor air  
temperature (+25_F/13.9_C) or outdoor coil temperature is more  
than 80_F (26.7_C) or if outdoor fan has been OFF for 30 minutes.  
(Fan is turned on to allow refrigerant system to stabilize.)  
S Low pressure switch is ignored for first 3 minutes during low  
ambient start up. After 3 minutes, if LPS trips, then outdoor fan  
motor is turnedoff for10 minutes, withthe compressorrunning. If  
LPS closes within 10 minutes then cooling continues with the  
outdoor fan cycling per the coil temperature routine listed above  
for the remainder of the cooling cycle. If the LPS does not close  
within 10 minutes, then the normal LPS trip response (shut down  
cooling operation and generate LPS trip error) will occur.  
If OAT is 25°F (3.9_C), defrost will occur in high stage only,  
regardless of thermostat or User Interface demand, and will  
terminate at 50_F (10_C) coil temperature with a minimum of 2.5  
minutes in defrost.  
If the coil temperature does not reach 32_F (0_C) within the  
interval, the interval timer will be reset and start over.  
S Upon initial power up the first defrost interval is defaulted to 30  
minutes. Remaining intervals are at selected times.  
S Defrost is only allowed to occur below 50_F (10_C) outdoor  
ambient temperature.  
The outdoor fan output (ODF) will remain off for 20 seconds after  
termination. This delay will allow time for the system to capture  
the heat from the outdoor coil and reduce the “steam cloud” effect  
that may occur on transition from defrost to heating cycle. The  
outdoor fan output OFF delay of 20 seconds may be defeated to  
enable the fan to energize immediately at the time of termination  
and 12 seconds prior to the reversing valve de--energizing through  
Defrost  
This control offers 5 possible defrost interval times: 30, 60, 90, 120  
minutes, or AUTO.  
Defrost intervals are selected by dip switches on the unit control  
board or by the Evolution Control User Interface. The Evolution  
Control selection overrides the control board dip switch settings.  
Defrost interval times: 30, 60, 90, and 120 minutes or AUTO are  
selected by the Evolution Control User Interface (the dip switches  
are not used.)  
the  
User  
Interface  
setup  
screen  
(available  
with  
SYSTXBBUID01--C), or forced defrost pins as follows:  
The ODF fan delay defeat can be toggled by shorting the forced  
defrost pins for >15 seconds while in the standby mode (status  
LED on solid). The LED will start to flash when the toggle has  
taken place.  
AUTO defrost adjusts the defrost interval time based on the last  
defrost time as follows:  
S When defrost time <3 minutes, the next defrost interval=120  
minutes.  
8
 
Status code 4 shows the fan delay defeat is active (no delay).  
Status code 3 shows that it is not active (20 second delay).  
Check Charge  
Charged in high or low stage  
The code will continue to be displayed until after the short is  
removed. There is a 5 second wait before the code is cancelled  
once the short is removed. The code that is flashing will finish  
before going back to solid LED. The control is shipped with the  
ODF fan delay defeat NOT active.  
The change in status is remembered until toggled to a new status.  
A power down/power up sequence will not reset the status. It may  
be necessary to do the toggle twice to cycle to the desired state of  
the defeat.  
Factory charge amount and desired subcooling are shown on unit  
rating plate for high stage. Charging method is shown on  
information plate inside unit. To properly check or adjust charge,  
conditions must be favorable for subcooling charging. Favorable  
conditions exist when the outdoor temperature is between 70_F  
and 100_F (21.11_C and 37.78_C), and the indoor temperature is  
between 70_F and 80_F (21.11_C and 26.67_C). Follow the  
procedure below:  
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge  
by adding or removing 0.6 oz/ft (17.74 g/m) of 3/8 liquid line  
above or below 15ft (4.57 m) respectively.  
For standard refrigerant line lengths (80 ft/24.38 m or less), allow  
system to operate in cooling mode at least 15 minutes. If conditions  
are favorable, check system charge by subcooling method. If any  
adjustment is necessary, adjust charge slowly and allow system to  
operate for 15 minutes to stabilize before declaring a properly  
charged system.  
Defrost Hold  
On a non--communicating system, if the thermostat becomes  
satisfied (Y1 or Y1 and Y2) before the defrost cycle is terminated,  
the control will “hold” in defrost mode and finish the defrost cycle  
on the next call for heat.  
On models with communicating Evolution Control, defrost hold is  
not needed because the User Interface will complete the defrost  
cycle before shutting down the system.  
If the indoor temperature is above 80_F (26.67_C), and the  
outdoor temperature is in the favorable range, adjust system charge  
by weight based on line length and allow the indoor temperature to  
drop to 80_F (26.67_C) before attempting to check system charge  
by subcooling method as described above.  
Forced Defrost  
On a system with non--communicating (non--Evolution) control,  
forced defrost can be initiated by manually shorting the 2--pin  
header labeled FORCED DEFROST (see Fig 6) on the control  
board for 5 seconds then releasing.  
On a system with communicating (Evolution) control, forced  
defrost is initiated with the User Interface.  
If the indoor temperature is below 70_F (21.11_C), or the outdoor  
temperature is not in the favorable range, adjust charge for line set  
length above or below 15ft (4.57 m) only. Charge level should then  
be appropriate for the system to achieve rated capacity. The charge  
level could then be checked at another time when the both indoor  
and outdoor temperatures are in a more favorable range.  
NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20  
ft (6.10 m) vertical separation, See Long Line Guideline for  
special charging requirements.  
On all models, during a Forced Defrost:  
S If coil temperature is at defrost temperature of 32_F (0_C), and  
outdoor air temperature is below 50_F (10_C), a full defrost  
sequence will occur.  
S If coil temperature or outdoor air temperature does not meet the  
above requirements, an abbreviated 30 second defrost will occur.  
Quiet Shift  
Heating Check Chart Procedure  
Quiet Shift is a field--selectable defrost mode which may eliminate  
occasional noise that could be heard at the start of the defrost cycle  
and restarting of the heating cycle. On a non--communicating  
system, this feature must be enabled by selecting the 3rd position  
of the 3--position dip switch. For communicating (Evolution)  
systems, it must be enabled at the User Interface. When activated,  
the following sequence of operation will occur. Reversing valve  
will energize and compressor will turn off for 30 seconds, then turn  
back on to complete defrost. At the end of the defrost cycle, the  
reversing valve de--energizes, compressor will turn off for another  
30 seconds, and the fan will turn off for 40 seconds, before starting  
in the heating mode.  
To check system operation during heating cycle, refer to the Heat  
Pump Charging Instructions label on outdoor unit. This chart  
indicates whether a correct relationship exists between system  
operating pressure and air temperature entering indoor and outdoor  
units. If pressure and temperature do not match on chart, system  
refrigerant charge may not be correct. Do not use chart to adjust  
refrigerant charge.  
NOTE: In heating mode, check refrigerant charge only when  
pressures are stable. If in doubt, remove charge and weigh in  
correct refrigerant charge.  
NOTE: When charging is necessary during heating season, charge  
must be weighed in accordance with unit rating plate, ±0.6 oz./ft  
(±17.74 g/m). of 3/8--in. liquid--line above or below 15 ft (4.57  
m), respectively.  
Liquid-Line Solenoid Accessory  
In heat pump long--line applications, a liquid--line solenoid is  
required to control refrigerant migration in the heating mode. The  
solenoid should be installed near the outdoor unit with the arrow  
facing the outdoor unit. This is the direction of flow control. See  
application manual for long--line application details.  
EXAMPLE:  
To calculate additional charge required for a 25--ft. line set:  
25 ft. -- 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.  
Accessory Liquid Solenoid with Evolution Communicating  
Control: When using the Evolution Control, the liquid--line  
solenoid output is provided at the Y1 connection. Connect the  
solenoid as shown in the wiring label diagram. This is a 24vac  
output that is energized whenever the compressor is energized. It  
closes, in the compressor off mode, to prevent refrigerant migration  
into the unit through the liquid--line.  
MAJOR COMPONENTS  
2-Stage Control Board  
The HP control board controls the following functions:  
S High and low stage compressor contactor operation  
S Outdoor fan motor operation  
S Reversing valve operation  
S Defrost operation  
S Low ambient cooling  
S Crankcase heater operation  
S Compressor external protection  
S Pressure switch monitoring  
S Time Delays  
On Systems with Accessory Liquid Solenoid Using  
a
Non--Communicating Thermostat: The liquid solenoid is  
connect to the Y1 and C terminal connections. The liquid solenoid  
closes, in the compressor off mode, to prevent refrigerant migration  
into the unit through the liquid--line.  
9
 
4. After a 15 minute delay, if there is a call for cooling or heat-  
ing and LPS or HPS is reset, the compressor contactor is  
energized.  
Field Connections  
On non--communicating (non--Evolution) system, the two--stage  
control receives 24vac low--voltage control system inputs through  
the R, C, Y1, Y2 and O connections located at the bottom of the  
control board (see Fig. 6.) On a non--communicating system,  
output W1 is connected at the bottom of the control board for  
auxiliary heat.  
5. If LPS or HPS has not closed after a 15 minute delay, the  
outdoor fan is turned off. If the open switch closes anytime  
after the 15 minute delay, then resume operation with a call  
for cooling or heating.  
6. If LPS or HPS trips 3 consecutive cycles, the unit operation  
is locked out for 4 hours.  
For  
connections.  
a
communicating system, use the ABCD Evolution  
7. In the event of a high--pressure switch trip or high--pressure  
lockout, check the refrigerant charge, outdoor fan operation,  
and outdoor coil (in cooling) for airflow restrictions, or in-  
door airflow in heating.  
Two Stage Compressor  
The two stage compressor contains motor windings that provide  
2--pole (3500 RPM) operation.  
Compressor Internal Relief  
8. In the event of a low--pressure switch trip or low--pressure  
lockout, check the refrigerant charge and indoor airflow  
(cooling) and outdoor fan operation and outdoor coil in  
heating.  
The compressor is protected by an internal pressure relief (IPR)  
which relieves discharge gas into the compressor shell when  
differential between suction and discharge pressure exceeds  
550--625 psi. The compressor is also protected by an internal  
overload attached to motor windings.  
Control Fault  
If the outdoor unit control board has failed, the control will flash  
the appropriate fault code (see Table 5). The control board should  
be replaced.  
Compressor Control Contactor  
The contactor has a 24volt coil. The electronic control board  
controls the operation of the contactor.  
Brown-Out Protection  
If the line voltage is less than 187v for at least 4 seconds, the  
appropriate compressor contactor and fan relay are de--energized.  
Compressor and fan operation are not allowed until voltage is a  
minimum of 190v. The control will flash the appropriate fault code  
(see Table 5).  
TROUBLESHOOTING  
Systems Communication Failure  
If communication with the Evolution control is lost with the User  
Interface, the control will flash the appropriate fault code. (See  
Table 5.) Check the wiring to the User Interface and the indoor and  
outdoor units.  
230V Brown-Out Protection Defeated  
The brownout feature can be defeated if needed for severe noisy  
power conditions. This defeat should always be a last resort to  
solving the problem. Defeat is available on the User Interface  
setup screen (available with SYSTXBBUID01--C), or can be  
initiated through the forced defrost pins for non--communicating  
systems as follows:  
Model Plug  
Each control board contains a model plug. The correct model plug  
must be installed for or the system to operate properly. (See Table  
4.)  
Table 4 – Model Plug Information  
The brownout toggle is accomplished by sorting the defrost pins  
from power up with the OAT and OCT sensor connector removed.  
After 3 seconds, the status of the force defrost short and the  
OAT/OCT as open will be checked. If correct, then the brownout  
will be toggled.  
Status code 6 shows the brownout is disabled.  
Status code 5 shows the brownout is active.  
PIN RESISTANCE  
MODEL  
MODEL PLUG  
NUMBER  
( K --- o h m s )  
NUMBER  
P i n s 1 --- 4  
P i n s 2 --- 3  
286BNA024  
286BNA036  
289BNA036  
286BNA048  
286BNA060  
HK70EZ041  
HK70EZ043  
HK70EZ012  
HK70EZ045  
HK70EZ047  
18  
18  
5.1  
18  
18  
91  
150  
180  
220  
360  
After the brownout defeat is set, power down and reinstall the  
OAT/OCT sensor and remove the short from the forced defrost  
pins. As long as the short on the forced defrost remains, the OAT  
and OCT faults will not be cleared. The code will continue to be  
flashed.  
The control is shipped with the brownout active. The change in  
status is remembered until toggled to a new status. A power  
down/power up sequence will not reset the status. it may be  
necessary to do the toggle twice to cycle to the desired state of the  
defeat.  
The model plug is used to identify the type and size of unit to the  
control.  
On new units, the model and serial numbers are input into the  
board’s memory at the factory. If a model plug is lost or missing at  
initial installation, the unit will operate according to the  
information input at the factory and the appropriate error code will  
flash temporarily. An RCD replacement board contains no model  
and serial information. If the factory control board fails, the model  
plug must be transferred from the original board to the replacement  
board for the unit to operate.  
NOTE: The model plug takes priority over factory model  
information input at the factory. If the model plug is removed after  
initial power up, the unit will operate according to the last valid  
model plug installed, and flash the appropriate fault code  
temporarily.  
230V Line (Power Disconnect) Detection  
If there is no 230v at the compressor contactor(s) when the indoor  
unit is powered and cooling or heating demand exists, the  
appropriate fault code is displayed. Verify the disconnect is closed  
and 230v wiring is connected to the unit.  
Compressor Voltage Sensing  
Pressure Switch Protection  
The control board input terminals labeled VS and L2 (see Fig. 6)  
are used to detect compressor voltage status and alert the user of  
potential problems. The control continuously monitors the high  
voltage on the run capacitor of the compressor motor. Voltage  
should be present any time the compressor contactor is energized  
and voltage should not be present when the contactor is  
de--energized.  
The outdoor unit is equipped with high-- and low--pressure  
switches. If the control senses the opening of a high-- or  
low--pressure switch, it will respond as follows:  
1. De--energize the compressor contactor.  
2. Keep the outdoor fan operating for 15 minutes.  
3. Display the appropriate fault code (see Table 5).  
10  
 
Contactor Shorted Detection  
Temperature Thermistors  
If there is compressor voltage sensed when there is no demand for  
compressor operation, the contactor may be stuck closed or there  
may be a wiring error. The control will flash the appropriate fault  
code.  
Thermistors are electronic devices which sense temperature. As the  
temperature increases, the resistance decreases. Thermistors are  
used to sense outdoor air (OAT) and coil temperature (OCT).  
Refer to Fig. 7 for resistance values versus temperature.  
If the control senses the compressor voltage after start--up and is  
then absent for 10 consecutive seconds while cooling or heating  
demand exists, the thermal protector is open. The control  
de--energizes the compressor contactor for 15 minutes, but  
continues to operate the outdoor fan. The control Status LED will  
flash the appropriate code shown in Table 5. After 15 minutes,  
with a call for low or high stage cooling or heating, the compressor  
contactor is energized. If the thermal protector has not re--set, the  
outdoor fan is turned off. If the call for cooling or heating  
continues, the control will energize the compressor contactor every  
15 minutes. If the thermal protector closes, (at the next 15 minute  
interval check) the unit will resume operation.  
THERMISTOR CURVE  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
If the thermal cutout trips for three consecutive cycles, then unit  
operation is locked out for 4 hours and the appropriate fault code is  
displayed.  
0
20  
40  
60  
80  
100  
120  
(-17.77) (-6.67)  
(4.44)  
(15.56) (26.67) (37.78) (48.89)  
TEMPERATURE °F (°C)  
No 230V at Compressor Contactor  
A08054  
If the compressor voltage is not sensed when the compressor  
should be starting, the appropriate contactor may be stuck open or  
there is a wiring error. The control will flash the appropriate fault  
code. Check the contactor and control box wiring.  
Fig. 7 -- Resistance Values Versus Temperature  
If the outdoor air or coil thermistor should fail, the control will  
flash the appropriate fault code. (See Table 5.)  
Troubleshooting units for proper switching between  
low & high stages  
Check the suction pressures at the service valves. Suction pressure  
should be reduced by 3--10% when switching from low to high  
capacity.  
Compressor current should increase 20--45% when switching from  
low to high stage. The compressor solenoid when energized in  
high stage, should measure 24vac.  
When the compressor is operating in low stage the 24v DC  
compressor solenoid coil is de--energized. When the compressor is  
operating in high stage, the 24v DC solenoid coil is energized. The  
solenoid plug harness that is connected to the compressor HAS an  
internal rectifier that converts the 24v DC signal to 24v AC. DO  
IMPORTANT: The outdoor air thermistor and coil thermistor  
should be factory mounted in the final locations. Check to ensure  
thermistors are mounted properly per Fig. 8 and Fig. 9.  
Thermistor Sensor Comparison  
The control continuously monitors and compares the outdoor air  
temperature sensor and outdoor coil temperature sensor to ensure  
proper operating conditions. The comparison is:  
S In cooling if the outdoor air sensor indicates 10_F  
(5.6_C) warmer than the coil sensor (or) the outdoor air sensor  
indicates 20_F (11_C) cooler than the coil sensor, the  
sensors are out of range.  
S In heating if the outdoor air sensor indicates 35_F (19.4_C)  
warmer than the coil sensor (or) the outdoor air sensor indicates  
10_F (5.6_C) cooler than the coil sensor, the sensors are out  
of range.  
NOT INSTALL  
A
PLUG WITHOUT AN INTERNAL  
RECTIFIER.  
Unloader Test Procedure  
If the sensors are out of range, the control will flash the appropriate  
fault code as shown in Table 5.  
The unloader is the compressor internal mechanism, controlled by  
the DC solenoid, that modulates between high and low stage. If it  
is suspected that the unloader is not working, the following  
methods may be used to verify operation.  
The thermistor comparison is not performed during low ambient  
cooling or defrost operation.  
Failed Thermistor Default Operation  
1. Operate the system and measure compressor amperage.  
Cycle the unloader on and off at 30 second plus intervals at  
the User Interface (from low to high stage and back to low  
stage). Wait 5 seconds after staging to high before taking a  
reading. The compressor amperage should go up or down  
at least 20 percent.  
2. If the expected result is not achieved, remove the solenoid  
plug from the compressor and with the unit running and the  
User Interface or thermostat calling for high stage, test the  
voltage output at the plug with a DC voltmeter. The read-  
ing should be 24 volts DC.  
3. If the correct DC voltage is at the control circuit molded  
plug, measure the compressor unloader coil resistance. The  
resistance should be 32 to 60 ohms depending on com-  
pressor temperature. If the coil resistance is infinite, much  
lower than 32 ohms, or is grounded, the compressor must  
be replaced.  
Factory defaults have been provided in the event of failure of  
outdoor air thermistor (OAT) and/or outdoor coil thermistor  
(OCT).  
If the OAT sensor should fail, low ambient cooling will not be  
allowed and the one--minute outdoor fan off delay will not occur.  
Defrost will be initiated based on coil temperature and time.  
If the OCT sensor should fail, low ambient cooling will not be  
allowed. Defrost will occur at each time interval during heating  
operation, but will terminate after 5 minutes.  
If there is a thermistor out of range error, defrost will occur at each  
time interval during heating operation, but will terminate after 5  
minutes.  
Count the number of short and long flashes to determine the  
appropriate flash code. Table 5 gives possible causes and actions  
related to each error.  
11  
 
OAT Thermistor must be  
locked in place with spheri-  
cal nib end facing towards  
the front of the control box  
OCT Thermistor  
must be secured  
tight on stub tube.  
Fig. 8 -- Outdoor Air Thermistor (OAT) Attachment  
Fig. 9 -- Outdoor Coil Thermistor (OCT) Attachment  
Status Codes  
Table 5 shows the status codes flashed by the amber status light.  
Most system problems can be diagnosed by reading the status code  
as flashed by the amber status light on the control board.  
The short flash is 0.25 seconds ON and the long flash is 1.0 second  
ON. Time between flashes is 0.25 seconds. Time between short  
flash and first long flash is 1.0 second. Time between code  
repeating is 2.5 seconds with LED OFF.  
The codes are flashed by a series of short and long flashes of the  
status light. The short flashes indicate the first digit in the status  
code, followed by long flashes indicating the second digit of the  
error code.  
EXAMPLE:  
3 short flashes followed by 2 long flashes indicates a 32 code.  
Table 5 shows this to be low pressure switch open.  
Table 5 – TROUBLESHOOTING  
AMBER LED  
FAULT  
FLASH  
POSSIBLE CAUSE AND ACTION  
OPERATION  
CODE  
On solid, no  
Standby – no call for unit operation  
None  
Normal operation  
flash  
Low Stage Cool/Heat Operation  
High Stage Cool/Heat Operation  
None  
None  
1, pause  
2, pause  
16  
Normal operation  
Normal operation  
System Commu-  
nications Failure  
Communication with User Interface lost. Check wiring to User Interface,  
indoor and outdoor units  
Control does not detect a model plug or detects an invalid model plug. Unit  
will not operate without correct model plug.  
Invalid Model Plug  
25  
High Pressure  
Switch Open  
High---pressure switch trip. Check refrigerant charge, outdoor fan operation  
and coils for airflow restrictions.  
31*  
Low Pressure  
Switch or Dis-  
charge Temp  
Switch Open  
Low---pressure switch or discharge temperature switch trip. Check refrigerant  
charge and indoor air flow.  
32*  
Control Fault  
45  
46  
Outdoor unit control board has failed. Control board needs to be replaced.  
Line voltage < 187v for at least 4 seconds. Compressor and fan operation  
not allowed until voltage>190v. Verify line voltage.  
Brown Out (230 v)  
There is no 230v at the contactor when indoor unit is powered and cooling/  
heating demand exists. Verify the disconnect is closed and 230v wiring is  
connected to the unit.  
No 230v at Unit  
47  
53  
Outdoor Air Temp  
Sensor Fault  
Outdoor air sensor not reading or out of range. Ohm out sensor and check  
wiring.  
Outdoor Coil  
Sensor Fault  
Thermistors out of  
range  
55  
56  
Coil sensor not reading or out of range. Ohm out sensor and check wiring.  
Improper relationship between coil sensor and outdoor air sensor. Ohm out  
sensors and check wiring.  
Compressor operation detected then disappears while low stage demand  
exists. Possible causes are internal compressor overload trip or start relay  
and capacitor held in circuit too long (if installed).  
Compressor operation detected then disappears while high stage demand  
exists. Possible causes are internal compressor overload trip or start relay  
and capacitor held in circuit too long (if installed).  
Low Stage  
71*  
72*  
Thermal Cutout  
High Stage  
Thermal Cutout  
Compressor voltage sensed when no demand for compressor operation  
Contactor Shorted  
73  
74  
81  
82  
83  
84  
exists. Contactor may be stuck closed or there is a wiring error.  
No 230V at  
Compressor  
Low Stage  
Thermal Lockout  
High Stage  
Thermal Lockout  
L ow --- Pr essu r e  
Lockout  
High --- Pr essu r e  
Lockout  
Compressor voltage not sensed when compressor should be starting. Con-  
tactor may be stuck open or there is a wiring error.  
Thermal cutout occurs in three consecutive low/high stage cycles. Low  
stage locked out for 4 hours or until 24v power recycled.  
Thermal cutout occurs in three consecutive high/low stage cycles. High  
stage locked out for 4 hours or until 24v power recycled.  
Low pressure switch trip has occurred during 3 consecutive cycles. Unit  
operation locked out for 4 hours or until 24v power recycled.  
High pressure switch trip has occurred during 3 consecutive cycles. Unit  
operation locked out for 4 hours or until 24v power recycled.  
*
Sequence: Compressor contactor is de---energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor contactor after 15 minute  
delay. If fault is cleared, unit will resume operation. If fault still exists, fan shuts off, and error code continues to flash. Control will attempt re---start every 15 minutes. Cycling low voltage  
defeats the 15 minute delay.  
12  
 
2 STAGE  
FAN  
Variable Speed  
Furnace  
2-Stage  
Heat Pump  
HEAT PUMP  
COIL  
THERMIDISTAT  
Thermidistat  
O
O
O
Y1  
Y1  
RVS/Heat Stage 2  
O/B W2  
W/W1  
Y1  
RVS Cooling  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
W1  
W1  
W2  
Y/Y2  
G
Heat Stage 1  
Compressor Low  
Compressor High  
Fan  
W/W1  
W1  
Y1  
Y2  
*
Heat Stage 3 (furnace)  
Heat/Cool Stage 1  
Heat/Cool Stage 2  
Fan  
REMOVE J2  
JUMPER FOR  
HEAT STAGING  
Y/Y2  
G
Y2  
Y/Y2  
G
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
Rc  
REMOVE J1 FOR  
DEHUMIDIFY  
MODES  
Rc  
D1  
DH  
C
D1  
DHUM  
COM  
Dry Contact 2  
D2  
C
Dry Contact 2  
D2  
24VAC Common  
Humidify  
C
C
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
HUM  
OAT  
RRS  
OAT/RRS  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Valve  
*
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required / available.  
A08055  
A10107  
Fig. 10 - Thermidistat Models T6-PRH-01 or T6-NRH-01)  
Wiring with 2-Stage Heat Pump (non-communicating)  
F i g . 1 1 - T h e r m i d i s t a t M o d e l T 6 - P R H - 0 1 o r T 6 - N R H - 0 1 w i t h  
Variable Speed Furnace and 2-Stage Heat Pump  
(non-communicating)  
Communicating HP  
User Interface  
Furnace or Fan Coil  
D
C
B
A
D
C
B
A
D
C
B
A
Humidifier  
A08091  
Fig. 12 - Variable Speed Furnace or Fan Coil Wiring with Communicating 2-Stage HP  
LEGEND  
24v Factory Wiring  
24v Field Wiring  
Field Splice Connection  
A09306  
13  
 
FINAL CHECKS  
CARE AND MAINTENANCE  
IMPORTANT: Before leaving job, be sure to do the following:  
For continuing high performance and to minimize possible  
equipment failure, periodic maintenance must be performed on this  
equipment.  
1. Ensure that all wiring is routed away from tubing and sheet  
metal edges to prevent rub--through or wire pinching.  
Frequency of maintenance may vary depending upon geographic  
areas, such as coastal applications. See Owner’s Manual for  
information.  
2. Ensure that all wiring and tubing is secure in unit before  
adding panels and covers. Securely fasten all panels and  
covers.  
3. Tighten service valve stem caps to 1/12--turn past finger  
tight.  
4. Leave Users Manual with owner. Explain system operation  
and periodic maintenance requirements outlined in manual.  
5. Fill out Dealer Installation Checklist and place in  
customer file.  
R
PURON (R--410A) REFRIGERANT QUICK REFERENCE GUIDE  
S Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement  
components are designed to operate with Puron refrigerant.  
S Puron refrigerant cylinders are rose colored.  
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.  
S Puron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose  
when charging into suction line with compressor operating.  
S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.  
S Use hoses with 700 psig service pressure rating.  
S Leak detectors should be designed to detect HFC refrigerant.  
S Puron refrigerant, as with other HFCs, is only compatible with POE oils.  
S Vacuum pumps will not remove moisture from oil.  
S Do not use liquid--line filter driers with rated working pressures less than 600 psig.  
S Do not leave Puron refrigerant suction line filter driers in line longer than 72 hours.  
S Do not install a suction--line filter drier in liquid--line.  
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.  
S POE oils may cause damage to certain plastics and roofing materials.  
S Wrap all filter driers and service valves with wet cloth when brazing.  
S A factory--approved liquid--line filter drier is required on every unit.  
S Do NOT use an R--22 TXV.  
S If indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard--shutoff Puron refrigerant  
TXV.  
S Never open system to atmosphere while it is under a vacuum.  
S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter  
driers. Evacuate to 500 microns prior to recharging.  
S Do not vent Puron refrigerant into the atmosphere.  
S Do not use capillary tube coils.  
S Observe all warnings, cautions, and bold text.  
S All indoor coils must be installed with a hard--shutoff Puron refrigerant TXV metering device.  
E2010 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 02/10  
Catalog No. II286---289B---01  
Replaces: New  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
14  
 

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