Bryant Air Conditioner 127A User Manual

127A  
Legacyt Line Air Conditioner  
with Puronr Refrigerant  
1--1/2 To 5 Nominal Tons (Sizes 018 to 060)  
Installation Instructions  
5. When passing refrigerant tubes through the wall, seal open-  
SAFETY CONSIDERATIONS  
ing with RTV or other pliable silicon--based caulk. (See Fig.  
1.)  
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.  
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.  
9. When necessary, use hanger straps which are 1 in. (25.4  
mm) wide and conform to shape of tubing insulation. (See  
Fig. 1.)  
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.  
10. Isolate hanger straps from insulation by using metal sleeves  
bent to conform to shape of insulation.  
NOTE: Avoid contact between tubing and structure  
OUTDOOR WALL  
INDOOR WALL  
CAULK  
Recognize safety information. This is the safety--alert symbol  
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.  
LIQUID TUBE  
VAPOR TUBE  
JOIST  
INSULATION  
THROUGH THE WALL  
HANGER STRAP  
(AROUND VAPOR  
TUBE ONLY)  
INSULATION  
VAPOR TUBE  
!
WARNING  
1” (25.4 mm) MIN.  
LIQUID TUBE  
ELECTRICAL SHOCK HAZARD  
SUSPENSION  
Failure to follow this warning could result in personal  
injury or death.  
A94026  
Fig. 1 -- Piping Installation  
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.  
The outdoor unit contains system refrigerant charge for operation  
with ARI rated indoor unit when connected by 15 ft. (4.57 m) of  
field--supplied or factory accessory tubing. For proper unit  
operation, check refrigerant charge using charging information  
located on control box cover and/or in the Check Charge section of  
this instruction.  
INSTALLATION INSTRUCTIONS  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all  
residential applications including long line.  
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.  
IMPORTANT: Always install the factory--supplied liquid--line  
filter drier. If replacing the filter drier, refer to Product Data Digest  
for appropriate part number. Obtain replacement filter driers from  
your distributor or branch.  
3. Run refrigerant tubes as directly as possible by avoiding un-  
necessary turns and bends.  
4. Leave some slack between structure and unit to absorb vi-  
bration.  
 
Outdoor Unit Connected to Factory Approved Indoor  
Unit  
Outdoor unit contains correct system refrigerant charge for  
operation with factory approved ARI 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.  
Refrigerant Tubing Connection Outdoor  
Connect vapor and liquid tubes to fittings on vapor and liquid  
service valves (see Table 1.) Use refrigerant grade tubing  
A05178  
Fig. 3 -- Liquid Line Filter Drier  
Evacuate Refrigerant Tubing and Indoor Coil  
Sweat Connection  
!
CAUTION  
!
CAUTION  
UNIT DAMAGE HAZARD  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Service valves must be wrapped in a heat--sinking material  
such as a wet cloth while brazing.  
Never use the system compressor as a vacuum pump.  
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.  
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.  
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.  
Table 1 – Refrigerant Connections and Recommended Liquid  
and Vapor Tube Diameters (In.)  
LIQUID  
RATED VAPOR*  
UNIT SIZE  
(SERIES)  
Connection  
& Max. Tube  
Diameter  
Connection  
Tube  
Diameter  
Diameter  
24  
36  
48  
60  
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  
5000  
4500  
4000  
*
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.  
LEAK IN  
3500  
SYSTEM  
Notes:  
3000  
2500  
2000  
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.  
3. For alternate liquid line options on 18---42 size units, see Product Data or  
Residential Piping and Application Guideline  
VACUUM TIGHT  
TOO WET  
1500  
1000  
TIGHT  
DRY SYSTEM  
500  
Install Liquid-Line Filter Drier Indoor  
A95424  
0
1
2
3
4
5
6
7
!
CAUTION  
MINUTES  
A95424  
UNIT DAMAGE HAZARD  
Fig. 4 -- Deep Vacuum Graph  
Failure to follow this caution may result in equipment  
damage or improper operation.  
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.  
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.  
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.  
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.  
3
 
Table 2 – Accessory Usage  
REQUIRED FOR  
SEA COAST  
REQUIRED FOR LONG LINE  
ACCESSORY  
APPLICATIONS*  
APPLICATIONS  
(Within 2 miles/3.22 km)  
Ball Bearing Fan Motor  
Compressor Start Assist Capacitor and Relay  
Crankcase Heater  
No  
Yes  
Yes  
No  
Yes  
No  
No  
No  
No  
No  
No  
No  
No  
Yes  
No  
Evaporator Freeze Thermostat  
H a r d S h u t --- O f f T X V  
Liquid Line Solenoid Valve  
®
Motor Master or Low---ambient Pressure Switch  
No  
Recommended  
No  
Support Feet  
Winter Start Control  
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 35 ft. (10.7 m) vertical differential, refer to Residential Split---System Longline  
Application Guideline.  
{ Additional requirement for Low---Ambient Controller (full modulation feature) MotorMasterr Control.  
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.  
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.  
Use furnace transformer, fan coil transformer, or accessory  
transformer for control power, 24v/40va minimum.  
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 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.  
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.  
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.  
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.  
Compressor Crankcase Heater  
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.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
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.  
Failure to follow this warning could result in personal injury or  
death.  
The unit cabinet must have an uninterrupted or unbroken  
ground to minimize personal injury if an electrical fault should  
occur. The ground may consist of electrical wire or metal  
conduit when installed in accordance with existing electrical  
codes.  
Airflow Selections (ECM Furnaces)  
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  
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.  
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.  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
CONTACTOR  
FIELD POWER  
WIRING  
BLUE  
3 PHASE ONLY  
2. The Y1 call for low stage cooling energizes the “Fan” tap  
on the control board. The red wire from the fan tap is con-  
nected to tap 1 on the motor. Refer to the furnace Product  
Data to find the corresponding airflow. If the airflow setting  
for low cooling needs to be switched from tap 1 to a differ-  
ent tap, jumper a connection from the Fan tap to the desired  
tap so that the Y1 signal is communicated via the Fan tap to  
the desired speed tap. The Y1 setting will also govern the  
continuous fan airflow for the furnace.  
FIELD GROUND  
WIRING  
GROUND  
LUG  
A94025  
Fig. 5 -- Line Connections  
Connect Control Wiring  
Route 24--v control wires through control wiring grommet and  
connect leads to control wiring (See Fig. 7). Refer to Installation  
Instructions packaged with thermostat.  
Refer to the literature for the furnace for further details.  
4
 
Airflow Selection for Variable Speed Furnaces  
SYSTEM FUNCTIONS AND SEQUENCE  
OF OPERATION  
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:  
The 127A models utilize 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.  
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.  
When both first stage and second stage cooling are satisfied, the  
compressor will shut off. Therefore, with first stage of cooling Y1  
is powered on; and with second stage of cooling Y1 and Y2 are  
powered on. 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.  
3. The CF DIP switch setting determines airflow during low  
stage cooling operation. Select the CF DIP switch setting  
corresponding to the available airflow shown in the furnace  
installation instructions that most closely matches the re-  
quired airflow shown in the air conditioning Product Data  
for LOW speed. If a higher or lower continuous fan speed is  
desired, the continuous fan speed can be changed using the  
fan switch on the thermostat. Refer to the furnace Installa-  
tion Instructions for details of how to use this feature.  
Compressor Operation on 127A 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. 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%.  
Airflow Selection for FV4C Fan Coils  
The FV4 provides high-- and low--stage blower operation to match  
the capacities of the compressor at high-- and low--stage.  
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.  
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.  
Install Electrical Accessories  
Refer to the individual instructions packaged with kits or  
accessories when installing.  
Start--Up  
NOTE: 67% compressor capacity translates to approximately  
75% cooling capacity at the indoor coil.  
!
CAUTION  
UNIT OPERATION AND SAFETY HAZARD  
Follow these steps to properly start up the system:  
Failure to follow this caution may result in personal injury,  
equipment damage or improper operation.  
S Do not overcharge system with refrigerant.  
1. After system is evacuated, fully back seat (open) liquid and  
vapor service valves.  
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.  
S Do not operate unit in a vacuum or at negative pressure.  
S Compressor dome temperatures may be hot.  
3. Close electrical disconnects to energize system.  
4. Set room thermostat at desired temperature. Ensure that set  
point is below indoor ambient temperature and is set low  
enough to energize desired stage. In order to start the system  
in low stage, refer to the literature for the installed thermo-  
stat and adjust the set point so that the differential between  
the room temperature and the set temperature energizes Y1.  
!
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  
5. Set room thermostat to COOL and fan control to ON or  
AUTO mode, as desired.  
6. Operate unit for 15 minutes. Verify system refrigerant  
charge by measuring the sub-cooling for low stage and  
comparing with the published sub-cool on the rating plate.  
valves.  
7. In order to switch the the system to high stage, refer to the  
literature for the installed thermostat and adjust the set point  
to a lower value so that the differential between the room  
temperature and the set temperature energizes Y2. Verify  
system refrigerant charge by measuring the sub-cooling for  
high stage and comparing with the published sub-cool on  
the rating plate.  
5
 
Check Charge  
TROUBLESHOOTING  
The 127A units may be charged in high-- or low--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:  
If the compressor fails to operate with a cooling call, the table  
below (Resistance table) can be used to verify if there is any  
damage to the compressor windings causing system malfunction.  
Table 3 – Winding Resistance  
Winding resistance at 70_F +/--- 20_F  
(21.11_C +/--- 11.11_C)  
Winding  
127A024  
127A036  
127A048  
127A060  
Start  
(S --- C)  
2.74  
1.98  
1.55  
0.6  
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.  
Run  
(R --- C)  
0.8  
0.75  
0.48  
0.49  
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.  
Troubleshooting 127A units for proper switching  
between low- and high-stages  
Check the suction pressures at the service valves. Suction pressure  
should be reduced by 3--10% when switching from low to high  
stage.  
NOTE: The liquid pressures are very similar between low-- and  
high-- stage operation, so liquid pressure should not be used for  
troubleshooting.  
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.  
Compressor current should increase 20 to 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.  
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.  
The solenoid plug harness that is connected to the compressor has  
an internal rectifier that converts the 24v DC signal to 24v AC.  
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.  
DO NOT INSTALL A PLUG WITHOUT AN INTERNAL  
RECTIFIER.  
Unloader Test Procedure:  
Final Checks  
IMPORTANT: Before leaving job, be sure to do the following:  
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:  
1. Ensure that all wiring is routed away from tubing and sheet  
metal edges to prevent rub--through or wire pinching.  
1. Operate the system and measure compressor amperage.  
Cycle the unloader on and off at 30 second plus intervals at  
the thermostat (from low-- to high--stage and back to low--  
stage). Wait 10 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 Thermostat calling for high--stage, test the  
voltage output at the plug with a DC voltmeter. The reading  
should be 24 volts DC.  
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.  
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.  
6
 
MAJOR COMPONENTS  
2-Stage Compressor  
The 2--stage compressor contains motor windings that provide  
2--pole (3500 RPM) operation.  
CARE AND MAINTENANCE  
For continuing high performance and to minimize possible  
equipment failure, periodic maintenance must be performed on this  
equipment.  
Frequency of maintenance may vary depending upon geographic  
areas, such as coastal applications. See Owner’s Manual for  
information.  
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 and  
550 -- 625 psi. The compressor is also protected by an internal  
overload attached to motor windings.  
Compressor Control Contactor  
The contactor has a 24 volt coil and is controlled by Y1 input from  
the thermostat  
High and Low Pressure Switches  
High and low pressure switches are provided in line with the Y1  
signal to the contactor for protection. The high pressure switch  
mounted on the liquid tube is set to open at 670 psi and higher, and  
the low pressure switch mounted on the suction tube opens at a  
pressure of 50 psi and lower.  
7
 
TWO-STAGE  
AIR CONDITIONER  
Two-Stage  
Air Conditioner  
Variable Speed  
Fan Coil  
THERMIDISTAT  
Thermidistat  
O
Y1  
Y1  
W1  
RVS/Heat Stage 2  
O/W2/B  
W/W1  
Y1  
Heat Stage 1  
Compressor Low  
Compressor High  
Fan  
REMOVE J2  
JUMPER FOR  
HEAT STAGING  
W2  
Y/Y2  
G
Y2  
Y/Y2  
G
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
REMOVE J1 FOR  
DEHUMIDIFY  
MODES  
Rc  
DH  
C
D1  
C
Dry Contact 2  
D2  
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve  
Outdoor Air Temp  
Remote Room Sensor  
Outdoor Sensor  
OAT/RRS Return  
SRTN  
Remote Room  
Sensor  
A09276  
A09277  
T h er midistat Model s T 6 --- PRH --- 01 & T P --- NRH --- 01  
w/ Variable Speed Fan Coil & 2---Stage Air Conditioner  
Thermidistat Model TSTATBBPRH01---B  
w/ Variable Speed Furnace & 2---Stage Air Conditioner  
Fig. 6 -- Thermidistat Wiring with 2--Stage Puron refrigerant Air Conditioner  
HUMIDFIER  
(24VAC)  
A09279  
A09278  
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. 7 -- Generic Wiring Diagrams  
(See Thermostat Installation Instruction for specific unit combinations)  
8
 
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.  
9
 
E2009 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 12/09  
Catalog No. II127A--- 0 1  
Replaces: New  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
10  
 

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