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temperature. Normal temperature range is closed at 32_ 3_F (0
1.7_C) and open at 65_ 5_F (18 2.8_C).
NOTE: The defrost thermostat must be located on the liquid side
of the outdoor coil on the bottom circuit and as close to the coil as
possible. The factor location is on the left/back coil.
FEEDER TUBE
Fig. 28 - - Defrost Thermostat
PURONR (R- -410A) QUICK REFERENCE GUIDE
Puron refrigerant operates at 50- -70 percent higher pressures than R- -22. Be sure that servicing equipment and replacement
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components are designed to operate with Puron
Puron refrigerant cylinders are rose colored.
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Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
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Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
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charging into suction line with compressor operating
Manifold sets should be minimum 700 psig high side and 180 psig low side with 550 psig low- -side retard.
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Use hoses with minimum 700 psig service pressure rating.
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Leak detectors should be designed to detect HFC refrigerant.
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Puron, as with other HFCs, is only compatible with POE oils.
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Vacuum pumps will not remove moisture from oil.
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Do not use liquid- -line filter driers with rated working pressures less than 600 psig.
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Do not leave Puron suction line filter driers in line longer than 72 hrs.
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Do not install a suction- -line filter drier in liquid line.
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POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
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POE oils may cause damage to certain plastics and roofing materials.
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Wrap all filter driers and service valves with wet cloth when brazing.
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A factory approved liquid- -line filter drier is required on every unit.
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Do NOT use an R- -22 TXV.
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Never open system to atmosphere while it is under a vacuum.
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When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
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driers. Evacuate to 500 microns prior to recharging.
Do not vent Puron into the atmosphere.
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Observe all warnings, cautions, and bold text.
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All indoor coils must be installed with a hard shutoff Puron TXV metering device.
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Use the Troubleshooting Guides (See Tables 13- -15) if problems
occur with these units.
Use Start- -Up checklist to ensure proper start- -up procedures are
followed.
STUB TUBE
DEFROST
THERMOSTAT
C99029
56
TROUBLESHOOTING
START- -UP CHECKLIST
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