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WARNING
!
EXPLOSION,
PERSONAL
ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use all
service ports and open all flow- -control devices, including
solenoid valves.
If oil is detected or if low cooling performance is suspected,
leak- -test all refrigerant tubing using an electronic leak- -detector,
halide torch, or liquid- -soap solution. If a refrigerant leak is
detected, refer to the Check for Refrigerant Leaks section.
If no refrigerant leaks are found and low cooling performance is
suspected, refer to the Checking and Adjusting Refrigerant Charge
section.
Gas Input
The gas input does not require checking unless improper heating
performance is suspected. If a problem exists, refer to the Start- -Up
section.
Indoor Airflow
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply- - and return- -air grilles are open and free from
obstructions, and that the air filter is clean. When necessary, refer to
Quiet
Defrost interval
Shift
DIP switches
Fig. 23 - - Defrost Control
INJURY
AND
35
the Indoor Airflow and Airflow Adjustments section to check the
system airflow.
Check Defrost Thermostat
The defrost thermostat is usually located on the lowest liquid
leaving circuit of the left condenser coil (see Fig. 21). The
thermostat closes at 32_F (0_C) and opens at 65_F (18_C).
Puron Items
Metering Device (Thermostatic Expansion Valve &
Piston)
This unit uses both a hard shutoff, balance port TXV in the indoor
coil and a piston in each side of the outdoor coil. The TXV
maintains a constant superheat at the evaporator coil exit (cooling
mode) resulting in higher overall system efficiency.
Pressure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R- -410A)
systems. R- -22 pressure switches must not be used as replacements
for the Puron (R- -410A) system.
Loss of Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig. If system pressure is above this, switch
should be closed. To check switch:
1. Turn off all power to unit.
A08020
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