Bryant Puronr R-410A Refrigerant Quick Reference Guide, Catalog No. II123A 18---3

A/C			Typical
THERMOSTAT			FURNACE
24 VAC HOT
		R		R
24 VAC COM		C		C
HEAT STAGE 1	W/W1			W
COOL STAGE 1	Y/Y2			Y
INDOOR FAN		G		G

AIR

CONDITIONER

C

A/C		Typical	AIR
THERMOSTAT		FAN COIL	CONDITIONER
24 VAC HOT	R	R
24 VAC COM	C
		C
HEAT STAGE 1	W/W1	W2	C
COOL STAGE 1	Y/Y2
INDOOR FAN	G	G
			A02326

123A / 124A

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

CCONTACTOR

A97368

Fig. 7 - Generic Wiring Diagrams

(See Thermostat Installation Instruction

for specific unit combinations)

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.

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. II123A---	18---3
			Replaces: II123A--- 18---	2
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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