PURON® (R-410A) QUICK REFERENCE GUIDE
• 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®.
• Puron® refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.
• 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.
• Manifold sets should be at least 700 psig high side and 180 psig low side with 550 psig low-side retard.
• Use hoses with 700 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• Puron®, as with other HFCs, is only compatible with POE oils.
• Vacuum pumps will not remove moisture from oil.
• Do not leave Puron® suction line filter driers in line longer than 72 hrs.
• Do not use liquid-line filter driers with rated working pressures less than 600 psig.
• Do not install a suction-line filter drier in liquid line.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• Poe oils may cause damage to certain plastics and roofing materials.
• Wrap all filter driers and service valves with wet cloth when brazing.
• A factory-approved liquid-line filter drier is required on every unit.
• Do not use an R-22 TXV.
• If indoor unit is equipped with an R-22 TXV, it must be changed to a Puron TXV.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, recover refrigerant, break vacuum with dry nitrogen prior to opening to atmosphere.
Evacuate to 500 microns prior to recharging.
• Always replace filter drier after opening system for service.
• Do not vent Puron® into the atmosphere.
• Do not use capillary tube coils.
• Observe all warnings, cautions, and bold text.
NOTES:
1. BRYANT THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS BEGIN-
NING WITH TSTAT _ _ _ _ _ _ _.
2. WIRING MUST CONFORM TO NEC LOCAL CODES.
3. SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH(ES), TEMPERATURE SWITCH, OR 5-MINUTE
COMPRESSOR CYCLE PROTECTION. CONNECT 24V FIELD WIRING TO FACTORY-PROVIDED STRIPPED
LEADS.
4. A LIQUID-LINE SOLENOID VALVE IS REQUIRED ON SOME UNITS. SEE SPECIFIC UNIT INSTRUCTIONS.
5. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE COMPRESSOR CYCLE PROTECTION
AND 4 CYCLES PER HOUR LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR DETAILS.
6. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR THERMOSTAT INSTALLATION IN-
STRUCTIONS.
A97368
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
CONTACTOR
C
© 2002 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231
—12—
Printed in U.S.A.
ii533a186
Catalog No. 5353-308
