Bryant Air Conditioner 180A User Manual

180A, 187A  
Evolutionr Line Air Conditioners  
with Puron Refrigerant  
2 to 5 Nominal Tons (Sizes 024 to 060)  
Installation Instructions  
NOTE: Read the entire instruction manual before starting the  
Indoor Thermostat Control Options  
installation.  
Evolution  
Control  
Standard 2---stage  
Unless otherwise noted, information in these installation  
instructions pertain to both 180A and 187A series units.  
Information that is unique to the 180A series will be identified as  
such; likewise information that is unique to the 187A series will  
also be identified.  
Model  
Thermostat  
187A  
180A  
Yes  
Yes  
Yes  
SAFETY CONSIDERATIONS  
Yes*  
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.  
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.  
* Units containing circuit board HK38EA015 or newer.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
Before installing, modifying, or servicing system, main  
electrical disconnect switch must be in the OFF position.  
There may be more than 1 disconnect switch. Lock out and  
tag switch with a suitable warning label.  
!
!
!
Recognize safety information. This is the safety--alert symbol  
.
WARNING  
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury.  
UNIT OPERATION AND SAFETY HAZARD  
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 may 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.  
Failure to follow this warning could result in personal injury,  
death and/or equipment damage.  
Puron refrigerant systems operate at higher pressures than  
standard R--22 systems. Do not use R--22 service equipment  
or components on Puron equipment.  
!
CAUTION  
CUT HAZARD  
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.  
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On rooftop applications, locate unit at least 6 in. (152.4 mm) above  
roof surface.  
!
CAUTION  
Operating Ambient  
UNIT DAMAGE HAZARD  
The minimum outdoor operating ambient in cooling mode is  
55_F/12.78_C without low ambient cooling enabled, and the  
maximum outdoor operating ambient in cooling mode is  
125_F/51.67_C. On Evolution communicating systems only, for  
both 180A and 187A models, low ambient cooling is available to  
0_F/--17.78_C.  
Failure to follow this caution may result in equipment  
damage or improper operation.  
If ANY refrigerant tubing is buried, provide a 6 in. (152.4  
mm) 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).  
Make Piping Connections  
!
Outdoor units may be connected to indoor section using  
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 Longline  
Guideline will reduce these losses. Refer to Table 1 for field tubing  
diameters. Refer to Table 2 for accessory requirements.  
WARNING  
PERSONAL INJURY AND ENVIRONMENTAL  
HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
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.  
There are no buried--line applications greater than 36 in. (914.4  
mm).  
If refrigerant tubes or indoor coil are exposed to atmosphere, they  
must be evacuated to 500 microns to eliminate contamination and  
moisture in the system.  
!
CAUTION  
Outdoor Unit Connected to Factory Approved Indoor  
Unit:  
UNIT DAMAGE HAZARD  
Outdoor unit contains correct system refrigerant charge for  
operation with factory approved ARI 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.  
Failure to follow this caution may result in equipment  
damage or improper operation.  
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.  
Table 1 – Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)  
LIQUID RATED VAPOR*  
UNIT SIZE  
Connection  
Tube  
Connection  
Tube  
Diameter  
Diameter  
Diameter  
5/8  
Diameter  
187A024  
187A036  
187A048  
187A060  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
5/8  
3/4  
7/8  
3/4  
7/8  
7/8  
1 --- 1 / 8  
180A024  
180A036  
180A048  
3/8  
3/8  
3/8  
3/8  
7/8  
7/8  
7/8  
180A060  
1 --- 1 / 8  
*
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.  
Notes:  
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. (6.10 m) vertical differential (250 ft./76.2 m Total Equivalent Length),  
refer to the Residential Piping and Longline Guideline.  
ISO 9001:2000  
the environmentally sound refrigerant  
REGISTERED  
This product has been designed and manufactured to  
meet Energy Star® criteria for energy efficiency when  
matched with appropriate coil components. However,  
proper refrigerant charge and proper air flow are critical  
to achieve rated capacity and efficiency. Installation of  
this product should follow all manufacturing refrigerant  
charging and air flow instructions. Failure to confirm  
proper charge and air flow may reduce energy  
efficiency and shorten equipment life.  
3
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Table 2 – Accessory Usage  
REQUIRED FOR  
L O W --- A M B I E N T C O O L I N G  
APPLICATIONS  
REQUIRED FOR SEA COAST  
APPLICATIONS  
(Within 2 miles/3.22 km)  
REQUIRED FOR LONG LINE  
APPLICATIONS*  
Accessory  
(Below 55°F/12.8_C)  
Accumulator  
Compressor Start Assist Capacitor and  
Relay}  
No  
No  
No  
Standard on 187A models.  
Not required for 180A models.  
Standard  
Standard on 187A models.  
Not required for 180A models.  
Standard  
Standard on 187A models.  
Not required for 180A models.  
Standard  
Crankcase Heater  
Standard with Evolution Control  
(Low Ambient not allowed with non---  
communicating Thermostat)  
No  
Standard with Evolution Control (Low  
Ambient not allowed with non---com-  
municating thermostat)  
Evaporator Freeze Protection  
Liquid Line Solenoid Valve  
Low---ambient Control  
No  
No  
No  
No  
No  
No  
Yes{  
Puron Balance Port Hard Shut---off TXV  
Winter Start Control  
Yes{  
No  
Yes{  
Standard with Evolution Control (Low  
Ambient not allowed with Non---Com-  
municating Thermostat)  
No  
Support Feet  
Recommended  
No  
Recommended  
*
For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (250 ft./76.2 m Total Equivalent Length),  
refer to the Residential Piping and Long Line Guideline for Air Conditioners and Heat Pumps using Puron® Refrigerant.  
{
}
Required on all indoor units. Standard on all new Puron fan coils and furnace coils.  
Information is specific to 187A and 180A models.  
Install Liquid-Line Filter Drier Indoor  
Refrigerant Tubing Connection Outdoor  
Connect vapor tube to fitting on outdoor unit vapor service valves  
(see Table 1.) Connect and braze the 3/8 in. coupling (provided  
with the filter drier) to the liquid service valve and connect and  
braze the liquid tubing to the other end of this coupling. Use  
refrigerant grade tubing.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
Sweat Connection  
Installation of filter drier in liquid line is required.  
!
CAUTION  
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.  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
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.  
S Use a brazing shield  
S Wrap service valves with wet cloth or heat sink material.  
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.  
Evacuate Refrigerant Tubing and Indoor Coil  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
A05178  
Fig. 3 -- Liquid Line Filter Drier  
Never use the system compressor as a vacuum pump.  
4
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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._  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Deep Vacuum Method  
The deep vacuum method requires a vacuum pump capable of  
pulling a vacuum of 500 microns and a vacuum gage 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)  
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.  
5000  
4500  
4000  
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.  
LEAK IN  
3500  
SYSTEM  
3000  
2500  
2000  
1500  
1000  
DISCONNECT  
PER N. E. C. AND/OR  
LOCAL CODES  
CONTACTOR  
VACUUM TIGHT  
FIELD POWER  
WIRING  
TOO WET  
TIGHT  
500  
DRY SYSTEM  
FIELD GROUND  
A95424  
0
1
2
3
4
5
6
7
WIRING  
MINUTES  
GROUND LUG  
A95424  
A91056  
Fig. 4 -- Deep Vacuum Graph  
Fig. 5 -- Line Power Connections  
Final Tubing Check  
Connect Control Wiring  
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.  
Route low--voltage control wires through control wiring grommet  
and connect leads to control board.  
For Evolution, connect to ABCD only.  
For standard  
non--communicating thermostats, connect to standard thermostat  
connections R, C, Y1 and Y2.  
Use No. 18 AWG color--coded, insulated (35_C minimum) wire  
for all installations.  
Make Electrical Connections  
All wiring must be NEC Class 1 and must be separated from  
incoming power leads.  
Use furnace transformer or fan coil transformer for control power,  
24--v/40--va minimum. The outdoor unit requires a minimum of  
27va/24 vac control power.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Final Wiring Checks  
Do not supply power to unit with compressor terminal  
box cover removed.  
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.  
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.  
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: 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.  
NOTE: On 187A models, starting the compressor without a  
minimum of 12 hours of crankcase heat prior to initial start--up  
may result in a compressor chattering noise and possible damage to  
the compressor.  
NOTE: Use copper wire only between disconnect switch and unit.  
Install Accessories  
Refer to the individual instructions packaged with kits or  
accessories when installing.  
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  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
5
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Make Airflow Selections  
START--UP  
Airflow Setup for Evolution Control Furnace of FE  
Fan coil (communicating)  
When using an Evolution User Interface, airflow is  
automatically selected based on equipment size. See User  
!
CAUTION  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this caution may result in minor personal  
injury, equipment damage or improper operation.  
Interface  
adjustments.  
Installation Instructions  
for  
available  
To prevent compressor damage or personal injury,  
observe the following:  
S Do not overcharge system with refrigerant.  
S Do not operate unit in a vacuum or at negative pressure.  
S Do not disable low pressure switch  
Airflow Selection for Variable Speed Furnaces for  
Models Using Non-Communicating (non-Evolution)  
Thermostats  
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:  
S Dome temperatures may be hot in scroll and bottom  
temperatures may be hot in recip.  
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.  
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.  
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.  
Follow these steps to properly start up the system:  
1. After system is evacuated, fully back seat (open) liquid and  
vapor service valves.  
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 installation instructions for details  
of how to use this feature.  
2. Unit is shipped with valve stem(s) front seated (closed) and  
caps installed. Replace stem caps after system is opened to  
refrigerant flow (back seated). Replace caps finger--tight and  
tighten with wrench an additional 1/12 turn.  
Airflow Selection for FV4 Fan Coils for Models Using  
Non-Communicating (non-Evolution) Thermostats  
3. Close electrical disconnects to energize system.  
4. 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.  
5. Set room thermostat or User Interface to COOL and fan  
control to ON or AUTO mode, as desired. Operate unit for  
15 minutes. Check system refrigerant charge.  
The FV4B provides high-- and low--stage blower operation to  
match the capacities of 187A compressor at high-- and low--stage.  
The FV4C provides high-- and low--stage blower operation to  
match the capacities of 180A compressor at high-- and low--stage  
(units containing circuit board HK38EA015 or newer). To select  
recommended airflow, refer to the FV4 Installation Instructions.  
The FV4 utilizes an Easy Select control board that allows the  
installing technician to select proper airflows. For adjustments to  
control board and recommended A/C SIZE and CFM ADJUST  
selections. This fan coil has an adjustable blower off delay factory  
set at 90 sec. for high-- and low--stage blower operation.  
NOTE: Non--communicating (non--Evolution) Bryant electronic  
thermostats are equipped with a 15--minute staging timer. This  
timer prevents the 2--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 (±2.78_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_ (±2.78_C) below room ambient.  
For other combinations of equipment consult the Product Data  
Sheet.  
6. Set room thermostat to COOL and fan control to AUTO or  
ON as desired. Wait for appropriate time delay(s). Operate  
unit for 15 minutes. Check refrigerant charge.  
6
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products. The green LED will remain OFF until communications 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.  
System Functions And Sequence Of Operation  
The outdoor unit control system has special functions. The  
following is an overview of the 2--stage control functions:  
Cooling Operation  
187A and 180A (containing circuit board HK38EA015 or newer)  
models utilize either a 2--stage cooling indoor thermostat or an  
Evolution communicating User Interface. 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 or User  
Interface. After second stage is satisfied, the unit returns to  
low--stage operation until first stage is satisfied or until second  
stage is required again. When both first stage and second stage  
cooling are satisfied, the compressor will shut off.  
NOTE: On 187A models, if unit has not operated within the past  
12 hrs, or following a unit power--up, upon the next thermostat  
high-- or low--stage demand, unit operates for a minimum of 5  
minutes in high--stage.  
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 6 for codes and definitions.  
NOTE: Only one code will be displayed on the outdoor unit  
control board (the most recent, with the highest priority).  
Utility Interface  
With Evolution Control  
The utility curtailment relay should be wired between R and Y2  
connections on the control board for Evolution Communicating  
Systems only (see Fig. 6.) This input allows a power utility device  
to interrupt compressor operation during peak load periods. When  
the utility sends a signal to shut the system down, the User  
Interface will display, “Curtailment Active”.  
NOTE: With non--communicating (non--Evolution) systems, with  
first stage of cooling, (Y1) is powered on; and with second stage of  
cooling, (Y1 and Y2) are on.  
One Minute Stage Change Time Delay on 187A Models  
When compressor changes stages from high to low or low to high,  
there is a 1--minute time delay before compressor restarts. The  
outdoor fan motor remains running.  
NOTE: When 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.  
Compressor Operation on 187A Models  
NOTE: Outdoor fan motor will continue to operate for one  
minute after compressor shuts off, when outdoor ambient is greater  
than or equal to 100_F (37.78_C). This reduces pressure  
differential for easier starting on the next cycle.  
When the compressor operates in high--stage operation, the motor  
rotates clockwise. Both the lower and upper pistons are eccentric  
with the rotating crankshaft and both compress refrigerant.  
When the compressor operates in low--stage operation the motor  
reverses direction (rotates counterclockwise). The lower piston  
becomes idle and the upper piston compresses refrigerant. The  
start and run windings are reversed.  
Communication and Status Function Lights  
For Evolution Control Only, Green communications (COMM)  
Light  
A green LED (COMM light) on the outdoor board (see Fig. 6)  
indicates successful communication with the other system  
MODEL  
PLUG  
UTILITY RELAY  
*
UTILITY SIGNAL  
OPEN RELAY  
LLS  
Liquid Line Solenoid  
*
SUPPLIED BY UTILITY PROVIDER  
A06526  
Fig. 6 -- 2--Stage Control Board  
7
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In low ambient cooling (below 55_F/12.78_C) on 187A and 180A  
models, the control board cycles the fan off and on.  
Compressor Operation on 180A Models  
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.  
Time Delays  
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.  
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.  
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 On 187A models there is a 1 minute time delay between staging  
from low to high and from high to low capacity. On 180A  
models there is no delay; the compressor will change from low  
to high and from high to low capacity on the fly to meet the  
demand.  
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.  
Low Ambient Cooling  
If this unit will be required to operate below 55_F/12.78_C  
outdoor temperature, provisions must be made for low ambient  
operation.  
NOTE: 67% compressor capacity translates to approximately  
75% cooling capacity at the indoor coil.  
The compressor will always start unloaded and stay unloaded for  
five seconds even when the thermostat is calling for high--stage  
capacity.  
Evolution Controlled low ambient cooling:  
This unit is capable of low ambient cooling  
down to  
0_F/--17.78_C without a kit ONLY when using Evolution control.  
A low ambient kit is not required, and the outdoor fan motor does  
not need to be replaced for Evolution controlled low ambient  
operation. The Evolution Control provides an automatic  
evaporator coil freeze protection algorithm that eliminates the need  
for an evaporator freeze thermostat. Low ambient cooling must be  
enabled in the User Interface set up. Fan may not begin to cycle  
until about 40_F/4.4_C OAT. Fan will cycle based on coil and  
outdoor air temperature.  
Crankcase Heater Operation  
The crankcase heater is energized during unit off cycle regardless  
of OAT temperature on 187A models.  
The crankcase heater is energized during off cycle below  
65_F/18.33_C on 180A models.  
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 allow for easier starting during next cooling  
cycle.  
Evolution controlled low ambient mode operates as follows:  
S Fan is OFF when outdoor coil temp is < (outdoor air temperature +  
3 _F/1.67_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 temp > (outdoor air temperature +  
25_F/13.89_C)oroutdoorcoiltemp>80_F/26.67_Cor ifoutdoor  
fan has been OFF for 30 minutes. (Fan is turned on to allow  
refrigerant system to stabilize.)  
On 187A models, the outdoor fan remains energized during the  
1--minute compressor staging time delay.  
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 turned off for 10 minutes, with the compressor running. 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.  
On 187A 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 180A 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.  
For 180A models, the PWM output for both high-- and low--stage  
equals the value for low--stage operation below 55_F (12.8_C).  
Table 3 – Outdoor Fan Motor PWM  
Outdoor Temp (DC volts, Tolerance +/-- 2%)  
L O W --- & H I G H ---  
L O W --- S TA G E  
H I G H --- S TA G E  
STAGE  
(OAT>104_F/40_C)  
MODEL  
(OAT104_F/40_C)  
(OAT104_F/40_C)  
180A024  
180A036  
180A048  
180A060  
NOTE:  
9.57  
9.06  
9.91  
10.88  
10.23  
11.04  
11.70  
11.90  
11.90  
11.90  
11.90  
10.83  
For 180A 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).  
8
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Table 4 – Model Plug Information  
Check Charge  
All 180A and 187A units must be charged in high stage only.  
PIN RESISTANCE  
(K---ohms)  
MODEL  
MODEL PLUG  
NUMBER  
NUMBER  
Factory charge amount and desired subcooling are shown on unit  
rating plate. 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:  
P i n s 1 --- 4  
Pins 2---3  
187A024  
187A036  
187A048  
187A060  
HK70EZ001  
HK70EZ003  
HK70EZ005  
HK70EZ007  
5.1  
5.1  
5.1  
5.1  
11  
24  
39  
62  
180A024  
180A036  
180A048  
180A060  
HK70EZ009  
HK70EZ011  
HK70EZ013  
HK70EZ015  
5.1  
5.1  
5.1  
5.1  
91  
150  
220  
360  
Unit is factory charged for 15 ft (4.57 m) of lineset. Adjust charge  
by adding or removing 0.6 oz/ft (.018 kg/m) of 3/8 liquid line  
above or below 15 ft (4.57 m) respectively.  
Pressure Switch Protection  
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:  
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.  
1. De--energize the appropriate compressor contactor,  
2. Keep the outdoor fan operating for 15 minutes,  
3. Display the appropriate fault code (see Table 6).  
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.  
4. After a 15 minute delay, if there is still a call for cooling and  
the LPS or HPS is reset, the appropriate compressor contac-  
tor is energized.  
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.  
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.  
6. If LPS or HPS trips 3 consecutive cycles, the unit operation  
is locked out for 4 hours.  
7. In the event of a high pressure switch trip or high pressure  
lockout, check the refrigerant charge outdoor fan operation  
and outdoor coil for airflow restrictions.  
8. In the event of a low pressure switch trip or low pressure  
lockout, check the refrigerant charge and indoor airflow.  
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 6) Check the wiring to the User Interface, indoor and  
outdoor units.  
Control Fault  
If the outdoor unit control board has failed, the control will flash  
the appropriate fault code. (See Table 6) The control board should  
be replaced.  
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 6).  
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.)  
The model plug is used to identify the type and size of unit to the  
control. On 187A models, the model plug is also used to determine  
the start sequence timing for each individual model.  
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 UI) or can be  
initiated through the forced defrost pins for non--communicating  
systems as follows:  
The brownout toggle is accomplished by shorting 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.  
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.  
S Status code 6 shows the brownout is disabled.  
S Status code 5 shows the brownout is active.  
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.  
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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.  
187A Models Only, Compressor Start Detection  
In low--stage, if the specified start voltage at VR terminal is not  
achieved, the start relay is de--energized after 1 second and the  
control will flash the appropriate fault code.  
In high--stage, if the specified start voltage at VS terminal is not  
achieved, the start relay is de--energized after 1 second and the  
control will flash the appropriate fault code.  
230V Line (Power Disconnect) Detection  
If there is no 230v at the compressor contactor(s) when the indoor  
unit is powered and cooling demand exists, the appropriate error  
code is displayed (see Table 6). Verify that the disconnect is closed  
and 230v wiring is connected to the unit.  
If the specified start voltage is not achieved for 3 consecutive  
low--stage starts, low--stage operation is locked out for 30 minutes.  
If the specified start voltage is not achieved for 3 consecutive  
high--stage starts, high--stage operation is locked out for 30  
minutes. The control will flash the appropriate fault code.  
Compressor Voltage Sensing  
The control board input terminals labeled VS, VR and L2 on 187A  
models and VS and L2 on 180A models (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.  
Troubleshooting 187A units for proper switching  
between low- & high-stages  
Check the suction and liquid pressures at the service valves.  
Suction pressure should be reduced by 5--10% when switching  
from low to high capacity. There should be a 10--20% increase in  
liquid pressure when switching from low to high capacity.  
Compressor current should increase 100--250% when switching  
from low to high--stage.  
Contactor Shorted Detection  
If there is compressor voltage sensed when there is no demand for  
compressor operation, the contactor may be stuck closed or there is  
a wiring error. The control will flash the appropriate fault code.  
Troubleshooting 180A 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.  
187A Models, Compressor Thermal Cutout  
The control senses the compressor voltage at VR and VS. When  
starting or running, a phase difference of the voltages on the inputs  
will indicate the thermal protector is closed. If the phase difference  
is 5 degrees or less for 10 seconds, the internal protector is open.  
The control de--energizes the appropriate compressor contactor for  
15 minutes, but continues to operate the outdoor fan. The control  
Status LED will flash the appropriate code shown in Table 6. After  
15 minutes, with a call for low-- or high--stage cooling, the  
appropriate 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.  
NOTE: The liquid pressures are very similar between low-- and  
high--stage operation, so liquid pressure should not be used for  
troubleshooting.  
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 AC signal to 24v DC.  
DO NOT INSTALL A PLUG WITHOUT AN INTERNAL  
RECTIFIER.  
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.  
Unloader Test Procedure  
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.  
180A Models, Compressor Thermal Cutout  
If the control senses the compressor voltage after start--up, and is  
then absent for 10 consecutive seconds while cooling 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 6. After 15 minutes, with a call for low-- or  
high--stage cooling, the compressor contactor is energized. If the  
thermal protector has not re--set, the outdoor fan is turned off. If  
the call for cooling 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.  
1. Operate the system and measure compressor amperage.  
Cycle the unloader on and off at 30 second plus intervals at  
the UI (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 step one does not give the expected results, remove the  
solenoid plug from the compressor and with the unit run-  
ning and the UI calling for high--stage, test the voltage out-  
put at the plug with a DC voltmeter. The reading should be  
24 volts DC.  
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.  
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.  
Low or High Contactor Open (187A models) / No 230V  
at Compressor (180A models)  
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.  
10  
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Table 5 – 2---Stage Compressor  
(Winding Resistance at 70_F ± 20_ / 21.11_C ± 11.11_C)  
Winding  
S t a r t ( S --- C )  
Run (R---C)  
187A024  
2.74  
0.80  
187A036  
1.98  
0.75  
187A048  
1.55  
0.48  
187A060  
0.74  
0.36  
Winding  
S t a r t ( S --- C )  
R u n ( R --- C )  
180A024  
1.40  
1.32  
180A036  
1.29  
0.89  
180A048  
1.52  
0.64  
180A060  
0.60  
0.49  
MAJOR COMPONENTS  
2-Stage Control  
The 2--stage control board controls the following functions:  
-- Low-- and high--stage compressor contactor operation  
-- Outdoor fan motor operation  
THERMISTOR CURVE  
90  
80  
70  
60  
50  
40  
30  
20  
-- Low ambient cooling  
-- Crankcase heater operation  
-- Compressor external protection  
-- Pressure switch monitoring  
-- Time delays  
10  
0
-- On 187A models, start relay and capacitor  
Field Connections  
0
20  
40  
60  
80  
100  
120  
(-17.77) (-6.67)  
(4.44)  
(15.56) (26.67) (37.78) (48.89)  
On 187A models with non--communicating (non--Evolution)  
system, the 2--stage control receives 24vac low--voltage control  
system inputs through the R, C, Y1, and Y2 connections located at  
the bottom of the control board (see Fig. 6). The 187A can be  
controlled using a standard 2--stage thermostat or Evolution User  
Interface.  
All 180A models are part of a complete Evolution communicating  
system and use only the ABCD connections on the circuit board.  
The 180A must be controlled using an Evolution User Interface for  
proper equipment staging and operation  
TEMPERATURE °F (°C)  
A08054  
Fig. 7 -- Resistance Values Versus Temperature  
IMPORTANT: Outdoor air thermistor and coil thermistor are  
factory mounted in the final locations. Check to insure 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 If the outdoor air sensor indicates 10_F/5.56_C warmer than  
the coil sensor (or) the outdoor air sensor indicates ≥  
20_F/11.11_C cooler than the coil sensor, the sensors are out of  
range.  
If the sensors are out of range, the control will flash the appropriate  
fault code as shown in Table 6.  
The thermistor comparison is not performed during low ambient  
cooling or defrost operation.  
2-Stage Compressor  
The 2--stage compressor contains motor windings that provide  
2--pole (3500 RPM) operation. Refer to Table 5 for correct winding  
resistance.  
Compressor Internal Relief  
The compressor is protected by an internal pressure relief (IPR)  
which relieves discharge gas into compressor shell when  
differential between suction and discharge pressures exceeds 500 --  
550 psi on 187A models and 550 -- 625 psi on 180A models. The  
compressor is also protected by an internal overload attached to  
motor windings.  
Failed Thermistor Default Operation  
Factory defaults have been provided in the event of failure of  
outdoor air thermistor and/or coil thermistor.  
Compressor Control Contactors  
The contactor(s) have a 24 volt coil. The electronic control board  
controls the operation of the appropriate contactors.  
If the OAT sensor should fail, low ambient cooling will not be  
allowed and the one--minute outdoor fan off delay will not occur.  
TEMPERATURE THERMISTORS  
Thermistors are electronic devices which sense temperature. As the  
temperature increases, the resistance decreases. Thermistors are  
used to sense outdoor ambient (OAT) and coil temperature (OCT).  
Refer to Fig. 7 for resistance values versus temperature.  
If the OCT sensor should fail, low ambient cooling will not be  
allowed.  
If the outdoor ambient or coil thermistor should fail, the control  
will flash the appropriate fault code (see Table 6.)  
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OAT Thermistor must be locked in  
place with spherical nib end facing to-  
wards the front of the control box  
OCT Thermistor must be  
secured tight on the liquid  
tube.  
Fig. 8 -- Outdoor Air Thermistor (OAT) Attachment  
Fig. 9 -- Outdoor Coil Thermistor (OCT) Attachment  
FINAL CHECKS  
CARE AND MAINTENANCE  
For continuing high performance and to minimize possible  
equipment failure, periodic maintenance must be performed on this  
equipment.  
IMPORTANT: Before leaving job, be sure to do the following:  
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 Users 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.  
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between short flash and first long flash is 1.0 second. Time  
between code repeating is 2.5 seconds with LED OFF.  
Count the number of short and long flashes to determine the  
appropriate flash code. Table 6 gives possible causes and actions  
related to each error.  
Status Codes  
Table 6 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 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. 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  
EXAMPLE:  
3 short flashes followed by 2 long flashes indicates a 32 code.  
Table 6 shows this to be low pressure switch open.  
Table 6 – TROUBLESHOOTING  
AMBER  
LED  
FLASH  
FAULT  
POSSIBLE CAUSE AND ACTION  
OPERATION  
CODE  
On solid, no  
flash  
Standby – no call for unit operation  
None  
Normal operation  
low---stage Cool/Heat Operation  
high---stage Cool/Heat Operation  
None  
None  
1, pause  
2, pause  
Normal operation  
Normal operation  
System Commu-  
nications Failure  
16  
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 Open  
Control Fault  
32*  
45  
Low pressure switch trip. Check refrigerant charge and indoor air flow  
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)  
46  
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  
Outdoor Air Temp  
Sensor Fault  
Outdoor Coil Sen-  
sor Fault  
Thermistors out of  
range  
Outdoor air sensor not reading or out of range. Ohm out sensor and check  
wiring.  
53  
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)  
l ow --- stage T h er -  
mal Cutout  
71*  
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)  
Compressor voltage sensed when no demand for compressor operation  
exists. Contactor may be stuck closed or there is a wiring error.  
high---stage Ther-  
mal Cutout  
72*  
73  
Contactor Shorted  
No 230V at Com-  
pressor  
Compressor voltage not sensed when compressor should be starting. Con-  
tactor may be stuck open or there is a wiring error.  
74  
(180A Only)  
l ow --- stage D id Not  
Start  
Specified start voltage at VR terminal was not achieved in low---stage. Start  
relay was de---energized after 1 second.  
75  
76  
77  
78  
(187A Only)  
l ow --- stage D id Not  
Start 3 times  
(187AOnly)  
For 3 consecutive low---stage starts, the specified start voltage at VR terminal  
was not achieved & start relay was de---energized. low---stage locked out for  
30 minutes.  
h igh --- stage D id  
Specified start voltage at VS terminal was not achieved in high---stage. Start  
relay was de---energized after 1 second.  
Not Start  
(187A Only)  
h igh --- stage D id  
Not Start 3 times  
(187A Only)  
For 3 consecutive high---stage starts, the specified start voltage at VS termi-  
nal was not achieved & start relay was de---energized. high---stage locked  
out for 30 minutes.  
l ow --- stage T h er -  
Thermal cutout occurs in three consecutive low/ high---stage cycles. low---  
81  
82  
83  
84  
mal Lockout  
stage locked out for 4 hours or until 24v power recycled.  
high---stage Ther-  
mal Lockout  
Low Pressure  
Lockout  
High Pressure  
Lockout  
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.  
Low Contactor  
Open  
(187A Only)  
Compressor voltage not sensed when compressor should be starting. low---  
stage contactor may be stuck open or there is a wiring error.  
85  
High Contactor  
Open  
(187A Only)  
Compressor voltage not sensed when compressor should be starting. high---  
stage contactor may be stuck open or there is a wiring error.  
87  
*
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.  
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Two-Stage  
Variable Speed  
Fan Coil  
Variable Speed  
Furnace  
2-Stage  
Air Conditioner  
Thermidistat  
Air Conditioner  
Thermidistat  
O
Heat Stage 2  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
W1  
Y1  
Y1  
W1  
RVS/Heat Stage 2  
O/W2/B  
W/W1  
Y1  
Heat Stage 1  
Cool Stage 1  
Heat Stage 1  
Compressor Low  
Compressor High  
Fan  
REMOVE J2  
Y1  
JUMPER FOR  
HEAT STAGING  
W2  
Y/Y2  
G
Cool Stage 2  
Y/Y2  
G
Y/Y2  
Y2  
Y/Y2  
G
Fan  
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
R
R
C
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
Rc  
REMOVE J1 FOR  
DEHUMIDIFY  
MODES  
Rc  
D1  
DH  
C
D1  
D2  
DHUM  
COM  
C
Dry Contact 2  
D2  
C
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
HUM  
OAT  
RRS  
SRTN  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Valve  
*
Humidifier Solenoid  
Valve  
Outdoor Air Temp  
Remote Room Sensor  
Outdoor Sensor *  
Remote Room  
Sensor *  
Outdoor Sensor  
OAT/RRS Return  
SRTN  
Remote Room  
Sensor  
* Indicates connection may not be required / available.  
A09338  
A08060  
T h er midistat Model T 6 --- PRH01 --- A & T 6 --- NRH01 --- A  
w/ VS Furnace & 2---Stage Air Conditioner  
E dge T h er midistat Model s T 6 --- PRH --- 01 & T 6 --- NRH --- 01  
w/ Fan Coil & 2---Stage Air Conditioner  
TWO-STAGE  
VARIABLE SPEED  
FURNACE  
THERMIDISTAT  
AIR CONDITIONER  
RVS/Heat Stage 2  
Heat Stage 1  
O/W2/B  
W2  
W1  
Y1  
W/W1  
Y1  
Compressor Low  
Compressor High  
Fan  
Y1  
Y2  
Y/Y2  
G
Y/Y2  
G
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
Rc  
D1  
Dry Contact 2  
D2  
DHUM  
COM  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve  
Outdoor Air Temp  
Remote Room Sensor  
Outdoor Sensor  
OAT/RRS Return  
SRTN  
Remote Room  
Sensor  
A08057  
T h er midistat Model s T 6 --- PRH --- 01 & T 6 --- NRH --- 01  
w/ Furnace & 2---Stage Air Conditioner  
LEGEND  
24 VOLT FACTORY WIRING  
24 VOLT FIELD WIRING  
FIELD SPLICE CONNECTION  
RELAY SPDT, PILOT DUTY  
24-V COIL (HN61KK324)  
OR EQUIVALENT  
R1  
H
HUMIDISTAT, OPENS ON  
HUMIDITY RISE (HL38MG026)  
AIRFLOW SELECTOR  
AFS  
A02005  
Fig. 10 -- Thermidistat Wiring with 2--Stage Puron refrigerant Air Conditioner  
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Communicating AC//HP  
User Interface  
Fan Coil  
D
D
C
B
A
D
C
B
A
C
B
A
Humidifier  
A03076  
Fig. 11 -- Evolution Furnace or Fan Coil Wiring with Communicating 2--stage AC  
PURONR (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 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 balanced port Puron 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 balanced port Puron TXV metering device.  
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E2009 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 07/09  
Catalog No. II180A--- 0 6  
Replaces: II180A---05  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
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