Bryant Heat Pump 223A User Manual

223A, 224A  
Legacyt Line Heat Pump  
with Puronr Refrigerant  
1--1/2 To 5 Nominal Tons (Sizes 018 to 060)  
Installation Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
5. When passing refrigerant tubes through the wall, seal  
opening with RTV or other pliable silicon--based caulk.  
(See Fig. 1.)  
SAFETY CONSIDERATIONS  
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.)  
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  
National Electrical Code (NEC) for special requirements.  
8. Ensure that tubing insulation is pliable and completely  
surrounds vapor tube.  
9. When necessary, use hanger straps which are 1 in. wide and  
conform to shape of tubing insulation. (See Fig. 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  
CAULK  
INDOOR WALL  
LIQUID TUBE  
!
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 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.  
VAPOR TUBE  
JOIST  
INSULATION  
THROUGH THE WALL  
HANGER STRAP  
(AROUND VAPOR  
TUBE ONLY)  
INSULATION  
VAPOR TUBE  
!
WARNING  
1MIN.  
ELECTRICAL SHOCK HAZARD  
LIQUID TUBE  
SUSPENSION  
Failure to follow this warning could result in personal injury  
or death.  
A94028  
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.  
Fig. 1 -- Connecting Tubing Installation  
When outdoor unit is connected to factory--approved indoor unit,  
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 RECOMMENDATIONS  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
1. Locate unit away from windows, patios, decks, etc. where  
unit operation sound may disturb customer.  
IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all  
2. Ensure that vapor and liquid tube diameters are appropriate  
for unit capacity.  
3. Run refrigerant tubes as directly as possible by avoiding  
unnecessary turns and bends.  
4. Leave some slack between structure and unit to absorb  
vibration.  
residential applications including line line.  
IMPORTANT: Always install the factory--supplied liquid--line  
filter drier. Obtain replacement filter driers from your distributor or  
branch.  
 
Table 1 – Accessory Usage  
REQUIRED FOR LOW---AMBIENT  
REQUIRED FOR  
LONG LINE APPLICATIONS*  
(Over 80 ft. / 24.38 m)  
Standard  
REQUIRED FOR  
SEA COAST APPLICATIONS  
(Within 2 miles / 3.22 km)  
Standard  
Accessory  
COOLING APPLICATIONS  
(Below 55°F / 12.8°C)  
Standard  
Accumulator  
Ball Bearing Fan Motor  
Compressor Start Assist Capacitor and  
Relay  
Yes{  
No  
No  
Yes  
Yes  
No  
Crankcase Heater  
Yes  
No  
Yes  
Evaporator Freeze Thermostat  
Hard Shutoff TXV  
Yes  
Yes  
Yes  
No  
Yes  
No  
No  
Yes  
No  
Isolation Relay  
See Long---Line Application  
Guideline  
Liquid Line Solenoid Valve  
No  
No  
Motor Master® Control or  
Low Ambient Switch  
Yes  
No  
No  
Support Feet  
Recommended  
No  
Recommended  
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Split---System Longline  
Application Guideline.  
{ Additional requirement for Low---Ambient Controller (full modulation feature) MotorMasterr Control.  
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 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.  
RATED VAPOR  
up to 80 ft. (24.38 m)*  
LIQUID  
UNIT SIZE  
Connection  
Tube  
Connection  
Diameter  
Tube  
Diameter  
3/8  
Diameter  
Diameter  
018, 024  
030, 036  
042, 048  
060  
3/8  
3/8  
3/8  
3/8  
5/8  
3/4  
7/8  
7/8  
5/8  
3/4  
7/8  
3/8  
3/8  
3/8  
Refrigerant Tubing and Sweat Connections  
1--1/8  
Connect vapor tube to fitting on outdoor unit vapor service valves  
(see Table 2). Connect liquid tubing to adapter tube on liquid  
service valve. Use refrigerant grade tubing.  
Notes:  
1. Tube diameters are for total equivalent lengths up to 80 ft. (24.38 m)  
2. Do not apply capillary tube or fixed orifice indoor coils to these units.  
*
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 Longline Guideline--- Air Conditioners  
and Heat Pumps using Puronr Refrigerant.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Install Liquid Line Filter Drier Indoor  
Refer to Fig. 5 and install filter drier as follows:  
Failure to follow this caution may result in equipment  
damage or improper operation.  
1. Braze 5 in. (127 mm) liquid tube to the indoor coil.  
2. Wrap filter drier with damp cloth.  
Service valves must be wrapped in a heat--sinking material  
such as a wet cloth while brazing.  
3. Braze filter drier to 5 in. (127 mm) long liquid tube from  
step 1.  
Remove plastic retainer holding outdoor piston in liquid service  
valve, leaving the piston and piston retainer inside the valve.  
Connect sweat/flare adapter provided, to valve. (See Fig. 4.)  
Connect refrigerant tubing to fittings on outdoor unit vapor and  
liquid service valves. Service valves are closed from factory and  
ready for brazing. After wrapping service valve with a wet cloth,  
tubing set can be brazed to service valve using either silver bearing  
or non--silver bearing brazing material. Do not use soft solder  
(materials which melt below 800°F/427°C). Consult local code  
requirements. Refrigerant tubing and indoor coil are now ready for  
leak testing. This check should include all field and factory joints.  
4. Connect and braze liquid refrigerant tube to the filter drier.  
A05227  
Fig. 5 -- Liquid Line Filter Drier  
Evacuate Refrigerant Tubing and Indoor Coil  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
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.  
A05226  
Fig. 4 -- Liquid Service Valve  
3
 
Deep Vacuum Method  
Connect Ground and Power Wires  
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. 6.  
Connect ground wire to ground connection in control box for  
safety. Connect power wiring to contactor as shown in Fig. 7.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury or  
death.  
5000  
4500  
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.  
4000  
LEAK IN  
SYSTEM  
3500  
3000  
2500  
2000  
1500  
1000  
500  
Connect ground wire to ground connection in control box for  
safety. Connect power wiring to contactor as shown in Fig. 7.  
VACUUM TIGHT  
TOO WET  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
TIGHT  
DRY SYSTEM  
CONTACTOR  
A95424  
0
1
2
3
4
5
6
7
FIELD POWER  
WIRING  
MINUTES  
BLUE  
A95424  
3 PHASE ONLY  
Fig. 6 -- Deep Vacuum Graph  
FIELD GROUND  
WIRING  
GROUND  
LUG  
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. Pay close  
attention to feeder tubes, makings sure wire ties on feeder tubes are  
secure and tight.  
A94025  
Fig. 7 -- Line 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.  
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.  
!
CAUTION  
A00010  
Fig. 8 -- 3--Phase Monitor Control  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
(Applies to 3--Phase Units Only)  
Table 3 – 3--Phase Monitor LED Indicators  
Installation of filter drier in liquid line is required.  
LED  
OFF  
FLASHING  
STATUS  
No call for compressor operation  
Reversed phase  
Make Electrical Connections  
ON  
Normal  
!
WARNING  
Connect Control Wiring  
Route 24v control wires through control wiring grommet and  
connect leads to control wiring. See Thermostat Installation  
Instructions for wiring specific unit combinations. (See Fig. 9.)  
Use No. 18 AWG color--coded, insulated (35°C minimum) wire. If  
thermostat is located more than 100 ft (30.5 m) from unit, as  
measured along the control voltage wires, use No. 16 AWG  
color--coded wire to avoid excessive voltage drop.  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury or  
death.  
Do not supply power to unit with compressor terminal box  
cover removed.  
NOTE: Use copper wire only between disconnect switch and unit.  
All wiring must be NEC Class 1 and must be separated from  
incoming power leads.  
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.  
Use furnace transformer, fan coil transformer, or accessory  
transformer for control power, 24v/40va minimum.  
Route Ground and Power Wires  
NOTE: Use of available 24v accessories may exceed the  
minimum 40va power requirement. Determine total transformer  
Remove access panel to gain access to unit wiring. Extend wires  
from disconnect through power wiring hole provided and into unit  
control box.  
4
 
loading and increase the transformer capacity or split the load with  
an accessory transformer as required.  
HEAT  
PUMP  
TYPICAL  
FAN COIL  
HP THERMOSTAT  
Final Wiring Check  
R
C
R
R
C
24 VAC HOT  
24 VAC COM  
HEAT STAGE 2  
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.  
C
*
W2  
W2  
W2  
Compressor Crankcase Heater  
*
*
E
W3  
G
COOL/HEAT  
STAGE 1  
Y
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.  
A crankcase heater is required if refrigerant tubing is longer than  
80 ft. Refer to the Long Line Guideline--Residential Split--System  
Air Conditioners and Heat Pumps.  
Y
G
INDOOR FAN  
O
E
RVS COOLING  
O
EMERGENCY  
HEAT  
IF AVAILABLE  
*
Install Electrical Accessories  
LEGEND  
Refer to the individual instructions packaged with kits or  
accessories when installing.  
24-V FACTORY WIRING  
24-V FIELD WIRING  
Start--Up  
FIELD SPLICE CONNECTION  
OUTDOOR THERMOSTAT  
EMERGENCY HEAT RELAY  
SUPPLEMENTAL HEAT RELAY  
ODT  
EHR  
SHR  
!
CAUTION  
PERSONAL INJURY HAZARD  
Failure to follow this caution may result in personal  
injury.  
A02325 / A97413  
Fig. 9 -- Generic Wiring Diagrams  
(See Thermostat Installation Instructions for  
specific unit combinations)  
Wear safety glasses, protective clothing, and gloves when  
handling refrigerant and observe the following:  
S Front seating service valves are equipped with Schrader valves.  
Sequence of Operation  
!
NOTE: Defrost control board is equipped with 5 minute lockout  
timer that is initiated upon any interruption of power.  
CAUTION  
ENVIRONMENTAL HAZARD  
Turn on power to indoor and outdoor units. Transformer is  
energized.  
Failure to follow this caution may result in environmental  
damage.  
Cooling  
Federal regulations require that you do not vent refrigerant to  
the atmosphere. Recover during system repair or final unit  
disposal.  
On a call for cooling, thermostat makes circuits R--O, R--Y, and  
R--G. Circuit R--O energizes reversing valve, switching it to  
cooling position. Circuit R--Y sends low voltage through the  
safeties and energizes the T1 terminal on the circuit board. If the  
compressor has been off for 5 minutes, or power has not been  
cycled for 5 minutes, the OF2 relay and T2 terminal will energize.  
This will close the contactor, and start the outdoor fan motor and  
compressor.  
!
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 Do not disable low pressure switch in scroll compressor  
applications.  
When the cycle is complete, R--Y is turned off, stopping the  
compressor and outdoor fan. The 5 minute time guard begins  
counting. Compressor will not come on again until this delay  
expires. In the event of a power interruption, the time guard will  
not allow another cycle for 5 minutes.  
NOTE: If the indoor blower off delay is enabled, it will run up to  
an additional 90 seconds to increase system efficiency.  
S Compressor dome temperatures may be hot.  
Heating  
Follow these steps to properly start up system:  
On a call for heating, thermostat makes circuits R--Y and R--G.  
Circuit R--Y sends low voltage through the safeties and energizes  
the T1 terminal on the circuit board. T1 energizes the defrost logic  
circuit. If the compressor has been off for 5 minutes, or power  
has not been cycled for 5 minutes, the OF2 relay and T2 terminal  
will energize. This will close the contactor, start the outdoor fan  
motor and compressor.  
When the cycle is complete, R--Y is turned off , stopping the  
compressor and outdoor fan. The 5 minute time guard begins  
counting. Compressor will not come on again until this time delay  
expires. In the event of a power interruption, the time guard will  
not allow another cycle for 5 minutes.  
1. After system is evacuated, fully 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.  
3. Close electrical disconnects to energize system.  
4. Set room thermostat at desired temperature. Be sure set  
point is below indoor ambient temperature.  
5. Set room thermostat to HEAT or COOL and fan control to  
ON or AUTO mode, as desired. Operate unit for 15  
minutes. Check system refrigerant charge.  
5
 
Quiet Shift  
Check Charge  
Quiet shift is a field selectable defrost mode (factory set to OFF),  
which will eliminate occasional noise that could be heard at the  
start of defrost cycle and restarting of heating cycle. It is selected  
by placing DIP switch 3 on defrost board (see Fig. 10) in the ON  
position.  
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:  
When Quiet Shift switch is placed in ON position, and a defrost is  
initiated, the following sequence of operation will occur. Reversing  
valve will energize, compressor will turn off for 30 seconds, and  
then turn back on to complete defrost. At the start of heating after  
conclusion of defrost, reversing valve will de--energize,  
compressor will turn off for another 30 seconds, and the fan will  
turn off for 40 seconds, before starting in the heating mode.  
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.  
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.  
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.  
Defrost  
The defrost control is a time/temperature control which has field  
selectable settings of 30, 60, 90, or 120 minutes, factory set to 90  
minutes. These settings represent the amount of time that must pass  
after closure of the defrost thermostat before the defrost sequence  
begins.  
The defrost thermostat senses coil temperature throughout the  
heating cycle. When the coil temperature reaches the defrost  
thermostat setting of approximately 32_F, it will close, which  
energizes the DFT terminal and begins the defrost timing sequence.  
When the DFT has been energized for the selected time, the defrost  
cycle begins. Defrost cycle is terminated when defrost thermostat  
opens, or automatically after 10 minutes.  
Defrost Speedup  
To initiate a forced defrost, speedup pins (J1) must be shorted with  
a flat head screwdriver for 5 seconds and RELEASED. If the  
defrost thermostat is open, a short defrost cycle will be observed  
(actual length depends on Quiet Shift switch position). When Quiet  
Shift is off, only a short 30 second defrost cycle is observed. With  
Quiet Shift ON, the speedup sequence is one minute; 30 second  
compressor off period followed by 30 seconds of defrost with  
compressor operation. When returning to heating mode, the  
compressor will turn off for an additional 30 seconds and the fan  
for 40 seconds.  
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.  
Heating Check Chart Procedure  
To check system operation during heating cycle, refer to the  
Heating Check Chart on outdoor unit. This chart indicates whether  
a correct relationship exists between system operating pressure and  
air temperature entering indoor and outdoor units. If pressure and  
temperature do not match on chart, system refrigerant charge may  
not be correct. Do not use chart to adjust refrigerant charge.  
If the defrost thermostat is closed, a complete defrost cycle is  
initiated. If the Quiet Shift switch is turned on, the compressor will  
be turned off for two 30 second intervals as explained previously.  
Final Checks  
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.  
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  
operation and periodic maintenance requirements outlined  
in manual.  
HK32EA003  
5. Fill out Dealer Installation Checklist and place in customer  
file.  
Speedup  
Pins  
Quiet  
Shift  
Defrost interval  
DIP switches  
A05378  
CARE AND MAINTENANCE  
Fig. 10 -- Defrost Control  
Table 4 – Defrost Control Speedup--Timing Sequence  
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 Users Manual for  
information.  
MINIMUM  
(MINUTES)  
MAXIMUM  
(MINUTES)  
SPEEDUP  
(NOMINAL)  
PARAMETER  
3 0 --- m i n u t e c y c l e  
5 0 --- m i n u t e c y c l e  
9 0 --- m i n u t e c y c l e  
1 0 --- m i n u t e c y c l e  
5 minutes  
27  
45  
81  
9
33  
55  
99  
11  
5.5  
7 sec  
12 sec  
21 sec  
2 sec  
4.5  
1 sec  
6
 
PURONR (R--410A) 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  
S Puron refrigerant cylinders are rose colored.  
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.  
S Puron 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, 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 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.  
7
 
E2007 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 12/07  
Catalog No. II223A--- 1 8 --- 4  
Replaces: II223A---18---3  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
8
 

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