Bryant 187B User Manual

187B (2 -- 5 TONS)  
180B (3 TON TROPHY)  
EVOLUTIONt SERIES 2--STAGE AIR CONDITIONER  
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  
187B / 180B  
Yes  
Yes  
INSTALLATION RECOMMENDATIONS  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
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.  
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  
ELECTRICAL SHOCK HAZARD  
9. When necessary, use hanger straps which are 1 in. (25.4  
mm) wide and conform to shape of tubing insulation. (See  
Fig. 1.)  
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.  
NOTE:Avoid contact between tubing and structure  
OUTDOOR WALL  
INDOOR WALL  
CAULK  
LIQUID TUBE  
!
CAUTION  
VAPOR TUBE  
JOIST  
CUT HAZARD  
INSULATION  
THROUGH THE WALL  
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.  
HANGER STRAP  
(AROUND VAPORTUBE ONLY)  
INSULATION  
VAPOR TUBE  
1” (25.4 mm) MIN.  
LIQUID TUBE  
SUSPENSION  
A94026  
Fig. 1 -- Piping Installation  
Table 1 – 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)  
Compressor Start Assist Kit  
Crankcase Heater  
No  
Standard  
Yes  
Standard  
No  
Standard  
Standard with Evolutiont Control  
(Low Ambient not allowed with  
non---communicating thermostat)  
No  
Standard with Evolution Control  
(Low ambient not allowed with  
non---communicating thermostat)  
Evaporator Freeze Protection  
Liquid---Line Solenoid Valve  
Low---Ambient Control  
No  
No  
No  
No  
No  
No  
Puron Refrigerant Balance Port Hard---  
ShutOff TXV  
Yes{  
Yes{  
Yes{  
Support Feet  
Recommended  
No  
Recommended  
Standard with Evolution Control  
(Low Ambient not allowed with  
non---communicating thermostat)  
Winter Start Control  
No  
No  
*
For tubing set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 35 ft. (10.7 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.  
Table 2 – Refrigerant Connections and Recommended Liquid  
and Vapor Tube Diameters (In.)  
Outdoor Unit Connected to Factory Approved Indoor  
Unit  
Outdoor unit contains correct system refrigerant charge for  
operation with factory approved AHRI rated indoor unit 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.  
NOTE: If the indoor furnace coil width is more than the furnace  
casing width, refer to the indoor coil Installation Instructions for  
transition requirements.  
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  
*
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 35 ft. (10.7 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.  
WARNING  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this warning could result in personal injury  
or equipment damage.  
3. For alternate liquid line options on 18---42 size units, see Product Data or  
Residential Piping and Application Guideline  
Install Liquid-Line Filter Drier Indoor  
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.  
!
CAUTION  
Refrigerant Tubing Connection Outdoor  
Connect vapor and liquid tubes to fittings on vapor and liquid  
service valves (see Table 2.) Use refrigerant grade tubing.  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Sweat Connection  
1. Installation of filter drier in liquid line is required.  
2. Filter drier must be wrapped in a heat--sinking material  
such as a wet cloth while brazing.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Service valves must be wrapped in a heat--sinking material  
such as a wet cloth while brazing.  
Use refrigeration 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.  
3
Refer to Fig. 3 and install filter drier as follows:  
1. Braze 5--in. liquid tube to the indoor coil.  
2. Wrap filter drier with damp cloth.  
Make Electrical Connections  
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.  
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.  
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: Use copper wire only between disconnect switch and 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.  
A05178  
Route Ground and Power Wires  
Fig. 3 -- Liquid Line Filter Drier  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
Evacuate Refrigerant Tubing and Indoor Coil  
!
CAUTION  
!
WARNING  
UNIT DAMAGE HAZARD  
ELECTRICAL SHOCK 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  
death.  
Never use the system compressor as a vacuum pump.  
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.  
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 triple evacuation  
procedure in service manual). Always break a vacuum with dry  
nitrogen.  
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.  
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. A tight dry system will hold a vacuum of 1000  
microns after approximately 7 minutes. See Fig. 4.  
DISCONNECT  
PER N. E. C. AND/OR  
LOCAL CODES  
CONTACTOR  
FIELD POWER  
WIRING  
5000  
4500  
4000  
FIELD GROUND  
LEAK IN  
3500  
WIRING  
SYSTEM  
GROUND  
LUG  
3000  
2500  
2000  
1500  
1000  
A91056  
Fig. 5 -- Line Connections  
VACUUM TIGHT  
TOO WET  
Connect Control Wiring  
TIGHT  
500  
DRY SYSTEM  
This unit is capable of communication with an Evolution Control,  
or will operate using standard 24v 2--stage thermostat. Route 24--v  
control wires through control wiring grommet and connect leads to  
control board. When an Evolution User Interface is available,  
connect A, B, C and D connections only. If a 2--stage thermostat is  
used, connect to the R, C, Y1, and Y2 connections. Refer to the  
wiring label to further clarification.  
0
1
2
3
4
5
6
7
MINUTES  
A95424  
Fig. 4 -- Deep Vacuum Graph  
Final Tubing Check  
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 or wires. Pay  
close attention to feeder tubes, making sure wire ties on feeder  
tubes are secure and tight.  
Use No. 18 AWG color--coded, insulated (35_C minimum) wire. If  
thermostat is located more than 100 ft. (30.48 m) from unit, as  
measured along the control voltage wires, use No. 16 AWG  
color--coded wire to avoid excessive voltage drop.  
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.  
NOTE: Use of available 24v accessories may exceed the  
minimum 40va power requirement. Determine total transformer  
loading and increase the transformer capacity or split the load with  
an accessory transformer as required.  
4
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.  
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.  
Compressor Crankcase Heater  
Airflow Selection for FV4C Fan Coils (non--com-  
municating)  
The FV4 provides high-- and low--stage blower operation to match  
the capacities of the compressor at high-- and low--stage.  
When equipped with a crankcase heater, furnish power to 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.  
To select recommended airflow, refer to the FV4C Installation  
Instructions. The FV4C utilizes an Easy Select control board that  
allows the installing technician to select proper airflows. This fan  
coil has an adjustable blower--off delay factory set at 90 sec. for  
high-- and low--stage blower operation.  
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.  
A crankcase heater is required if refrigerant tubing is longer than  
80 ft. (24.38 m). Refer to the Application Guideline and Service  
Manual Longline Section--Residential Split--System Air  
Conditioners and Heat Pumps.  
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.  
Start--Up  
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  
!
CAUTION  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this caution may result in personal injury,  
equipment damage or improper operation.  
S Do not overcharge system with refrigerant.  
S Do not operate unit in a vacuum or at negative pressure.  
S Compressor dome temperatures may be hot.  
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.  
!
CAUTION  
PERSONAL INJURY HAZARD  
Failure to follow this caution may result in personal injury.  
Wear safety glasses, protective clothing, and gloves when  
handling refrigerant and observe the following:  
S Front seating service valves are equipped with Schrader  
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.  
valves.  
SYSTEM FUNCTIONS AND SEQUENCE  
OF OPERATION  
The 180B  
/
187B 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.  
Refer to the literature for the furnace for further details.  
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:  
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 than 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.  
1. Turn SW1----5 ON for 400 CFM/ton airflow or OFF for 350  
CFM/ton airflow. Factory default is OFF.  
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-  
5
Communication and Status Function Lights  
Outdoor Fan Motor Operation  
The outdoor unit control energizes the outdoor fan any time the  
compressor is operating except for low--ambient cooling operation.  
For Evolution Control Only, Green communications  
(COMM)Light  
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.  
On 187B 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.  
Green LED (COMM Light)  
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 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.  
Amber Status Light  
On 180B 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.  
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  
Table 3 – Outdoor Fan Motor PWM  
Outdoor Temp (DC volts, Tolerance +/-- 2%)  
LOW--- &  
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”.  
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)  
(OAT>104_F/40_C)  
180B036  
9.06  
10.23  
11.90  
NOTE:  
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).  
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.  
In low ambient cooling (below 55_F/12.78_C) on 187B and 180B  
models, the control board cycles the fan off and on.  
Time Delays  
The unit time delays include:  
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. A single speed, high efficiency motor continues to  
run while the scroll modulates between the two capacity steps.  
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 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.  
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.  
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.  
Crankcase Heater Operation  
The crankcase heater is energized during off cycle below 65_F  
(18.33_C).  
6
MODEL  
PLUG  
MODEL  
PLUG  
UTILITY RELAY  
*
UTILITY SIGNAL  
OPEN RELAY  
LLS  
Liquid Line Solenoid  
*
SUPPLIED BY UTILITY PROVIDER  
A06526  
Fig. 6 -- 2--Stage Control Board  
Evolution Controlled Low Ambient Cooling  
Check Charge  
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.  
Models 180B / 187B should be charged in high stage compressor  
operation. 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:  
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge  
by adding or removing 0.6 oz/ft of 3/8 liquid line above or below  
15ft (4.57 m) respectively.  
Evolution controlled low ambient mode operates 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.  
Fan is OFF when outdoor coil temp is less than 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.)  
Fan is ON when outdoor coil temp is more than outdoor  
air temperature (+ 25_F / 13.89_C) or outdoor coil temp  
is more than 80_F (26.67_C) or if outdoor fan has been  
OFF for 30 minutes. (Fan is turned on to allow  
refrigerant system to stabilize.)  
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.  
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.  
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.  
The PWM output for both high and low--stage equals the  
value for low--stage operation, below 55_F (12.8_C).  
7
Final Checks  
IMPORTANT: Before leaving job, be sure to do the following:  
CARE AND MAINTENANCE  
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 Owner’s Manual with owner. Explain system opera-  
tion and periodic maintenance requirements outlined in  
manual.  
5. Fill out Dealer Installation Checklist and place in customer  
file.  
8
Control Fault  
TROUBLESHOOTING  
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.  
If the compressor fails to operate with a cooling call, Table 4 can be  
used to verify if there is any damage to the compressor windings  
causing system malfunction.  
Brown Out Protection  
Table 4 – Winding Resistance  
Winding resistance at 70_F + / --- 2 0 _F  
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)  
(21.11_C +/--- 11.11_C)  
Winding  
187B036 /  
180B036  
1.98  
187B024  
187B048  
187B060  
Star t (S --- C)  
Ru n (R --- C)  
2.74  
0.8  
1.55  
0.48  
0.6  
0.49  
0.75  
230 V Brown Out Protection Defeated:  
Systems Communication Failure  
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:  
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.  
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  
5).  
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.  
Table 5 – Model Plug  
Pin Resistance  
Model  
Number  
Model Plug  
Number  
(k - Ohms)  
S Status code 6 shows the brownout is disabled.  
Pin 1 - 4  
Pin 2 - 3  
S Status code 5 shows the brownout is active.  
187B024  
187B036  
180B036  
187B048  
187B060  
Hk70EZ040  
Hk70EZ042  
Hk70EZ011  
Hk70EZ044  
Hk70EZ046  
18K  
18K  
5.1K  
18K  
18K  
75K  
120K  
150K  
180K  
270K  
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 model plug is used to identify the type and size of unit to the  
control.  
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.  
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.  
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.  
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.  
Compressor Voltage Sensing  
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.  
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:  
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.  
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).  
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.  
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.  
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.  
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 reset, 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. If the thermal  
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.  
9
cutout trips for three consecutive cycles, then unit operation is  
locked out for 4 hours and the appropriate fault code is displayed.  
2--Stage Compressor  
The 2--stage compressor contains motor windings that provide  
2--pole (3500 RPM) operation. Refer to Table 4 for correct  
winding resistance.  
No 230V at Compressor  
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.  
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 550 --  
625 psi The compressor is also protected by an internal overload  
attached to motor windings.  
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.  
NOTE: The liquid pressures are very similar between low and  
high stage operation so liquid pressure should not be used for  
troubleshooting.  
Compressor Control Contactor  
The contactor has a 24 volt coil. The electronic control board  
controls the operation of the appropriate contactor.  
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  
outdoor ambient or coil thermistor should fail, the control will  
flash the appropriate fault code (see Table 6.)  
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.  
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.  
NOTE: DO NOT INSTALL A PLUG WITHOUT AN  
INTERNAL RECTIFIER.  
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:  
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.  
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.  
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 per-  
cent.  
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. 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 (or Thermostat) calling for high stage, test  
the voltage output at the plug with a DC voltmeter. The  
reading should be 24 volts DC.  
Failed Thermistor Default Operation  
Factory defaults have been provided in the event of failure of  
outdoor air thermistor and/or coil thermistor.  
If the OAT sensor should fail, low ambient cooling will not be  
allowed and the one minute outdoor fan--off delay will not occur.  
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.  
If the OCT sensor should fail, low ambient cooling will not be  
allowed.  
OAT Thermistor must be locked in place with spherical nib end  
facing towards the front of the control box  
THERMISTOR CURVE  
MAJOR COMPONENTS  
2--Stage Control  
90  
80  
70  
60  
50  
40  
30  
20  
The 2--stage control board controls the following functions:  
Compressor high and low stage operation  
Outdoor fan motor operation  
Low ambient cooling  
Compressor external protection  
Pressure switch monitoring  
Time delays  
10  
0
Field Connections  
0
20  
40  
60  
80  
100  
120  
(-17.77) (-6.67)  
(4.44)  
(15.56) (26.67) (37.78) (48.89)  
On 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 OD units can be controlled  
using a standard 2--stage thermostat or Evolution User Interface.  
TEMPERATURE °F (°C)  
A08054  
Fig. 7 -- Resistance Values Versus Temperature  
10  
OAT Thermistor must be  
locked in place with spherical  
nib end facing towards the  
front of the control box  
OCT Thermistor must be  
secured tight on the liquid tube.  
Fig. 9 -- Outdoor Coil Thermistor (OCT) Attachment  
Fig. 8 -- Outdoor Air Thermistor (OAT) Attachment  
Table 6 – TROUBLESHOOTING  
AMBER  
LED  
FLASH  
CODE  
OPERATION  
FAULT  
POSSIBLE CAUSE AND ACTION  
On sol-  
id, no  
flash  
Standby – no call for unit op-  
eration  
None  
Normal operation  
L ow --- stage Cool /Heat Oper a-  
None  
None  
1, pause  
2, pause  
16  
Normal operation  
Normal operation  
tion  
High-stage Cool/Heat Opera-  
tion  
System Communications  
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 trip. Check refrigerant charge, outdoor fan operation  
and coils for airflow restrictions.  
High Pressure Switch Open  
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 Sensor Fault  
Outdoor air sensor not reading or out of range. Ohm out sensor and check  
53  
55  
56  
wiring.  
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.  
Thermistors out of range  
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 Thermal Cutout  
High stage Thermal Cutout  
71*  
72*  
Compressor voltage sensed when no demand for compressor operation  
exists. Contactor may be stuck closed or there is a wiring error.  
Compressor voltage not sensed when compressor should be starting. Contac-  
tor 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 oper-  
ation locked out for 4 hours or until 24v power recycled.  
High pressure switch trip has occurred during 3 consecutive cycles. Unit oper-  
ation locked out for 4 hours or until 24v power recycled.  
Contactor Shorted  
73  
74  
81  
82  
83  
84  
No 230V at Compressor  
Low-stage Thermal Lockout  
High-stage Thermal Lock-  
out  
Low Pressure Lockout  
High Pressure Lockout  
* Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.  
11  
Two-Stage  
Air Conditioner  
Variable Speed  
Fan Coil  
Variable Speed  
Furnace  
2-Stage  
Air Conditioner  
Thermidistat  
Thermidistat  
O
Y1  
Y1  
W1  
Heat Stage 2  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
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  
JUMPER FOR  
HEAT STAGING  
Y1  
W2  
Y/Y2  
G
Cool Stage 2  
Y/Y2  
G
Y/Y2  
Y2  
Y/Y2  
G
Fan  
R
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
REMOVE J1 FOR  
DEHUMIDIFY  
MODES  
Rc  
Rc  
DH  
C
D1  
D1  
C
D2  
DHUM  
COM  
Dry Contact 2  
D2  
C
24VAC Common  
Humidify  
C
*
HUM  
OAT  
HUM  
*
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Air Temp  
Remote Room Sensor  
OAT  
RRS  
RRS  
Outdoor Sensor *  
Outdoor Sensor  
SRTN  
Remote Room  
Sensor *  
OAT/RRS Return  
SRTN  
SRTN  
Remote Room  
Sensor  
* See Humidifier Instructions for proper wiring  
* See Humidifier Instructions for proper wiring.  
A09566  
A09565  
T h er midistat Model s T 6 --- PRH01 --- A & T 6 --- NRH01 --- A  
w/ VS Fan Coil & 2---Stage Air Conditioner  
T h er midistat Model T 6 --- PRH01 --- A & T 6 --- NRH01 --- A  
w/ VS Furnace & 2---Stage Air Conditioner  
Fig. 10 -- Thermidistat Wiring with 2--Stage Puron refrigerant Air Conditioner  
R
R
*
*
* See Humidifier Instructions for proper wiring.  
* See Humidifier Instructions for proper wiring.  
A09568  
A09567  
2 --- Stage T h er mostat with Sin gl e --- Stage Fu r n ace an d  
2---Stage Air Conditioner  
Single Stage Furnace with 2---Stage Air Conditioner  
Fig. 11 -- VS Furnace or Fan Coil Wiring with Communicating 2--Stage AC  
Communicating AC//HP  
User Interface  
Fan Coil  
D
C
B
A
D
C
B
A
D
C
B
A
* See Humidifier Instructions for proper wiring.  
A09569  
Fig. 12 -- Evolution Furnace or Fan Coil with Communicating 2--Stage AC Wiring Diagram  
(See Thermostat Installation Instruction for specific unit combinations)  
12  
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 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 Puron TXV metering device.  
13  
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. II180---187B---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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