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APPENDIX A
Air Conditioner & Heat Pump with PURON
— Quick Reference Guide
S Puron
(R-410A) refrigerant operates at 50 percent to
70 percent higher pressures than R-22. Be sure tha t
servicing equipment a nd 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 Use only factory specified liquid-line filter driers with
rated working pressures greater than 600 psig.
S Do not install a suction-line filter drier in liquid-line.
S POE oils absorb moisture rapidly. Do not expose oi l 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 a TXV, it must be
changedtoaPuron
TXV.
S Never open system to atmosphere while it is under a
vacuum .
S When system must be opened for service, recover
refrigerant, break vacuum with dry nitrogen before
opening system.
S Always replace filter drier after opening system for
service.
S Do not vent Puron
into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions,andbold text.
S All Puron
heat pumps must have indoor TXV.
S Do not leave Puron
suction line driers in place for
more than 72 hours.
APPENDIX B
Wiring Diagram List
Unit
Electrical
Characteristics
Diagram
Number
38AUZD/E08
208/230---3--- 60 38AU000026
4 6 0 --- 3 --- 6 0 38A U000027
5 7 5 --- 3 --- 6 0 38A U000025
APPENDIX C
Low Ambient Option — F actory Installed
38AUZE08 units with the factory installed low ambient
option are equi pped with a Motormaster
R
solid--state head
pressure control which regulates fan speed. A temperature
sensor mounted on the outdoor coil controls the speed of
approved outdoor fan motors in order to maintain a
constant head pressure in the outdoor coil (see Fig. 27).
The control maintains the appropri ate head pressure a t
low ambient temperatures down to --20_F(--28_C).
C14297
Fig. 27 -- 38AUZE08 Motormaster Sensor Location
38AU
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