Refrigerant Circuit; Indoor Airflow; Metering Devices; Liquid Line Strainers - Payne PA3Z Installation Instructions Manual

Check to ensure no wires are touching refrigerant tubing or sharp
sheet metal edges. Move and secure wires to isolate from tubing
and sheet metal edges.
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check
each electrical component
instrumentation. Refer to the unit wiring label when making these
checks.
Step 7 — Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low performance is suspected, leak test all
refrigerant tubing using an electronic leak detector, or liquid- -soap
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 8 — Indoor Airflow
The airflow does not require checking unless improper
performance is suspected. If a problem exists, be sure that all
with the proper electrical
supply- - and return- -air grilles are open and free from obstructions,
and that the air filter is clean.
Step 9 — Metering Devices
Refrigerant cooling metering device is an AccuRater (024- -042) or
TXV (048- -060) located upstream of the indoor coil distributor
assembly.
Step 10 — High Flow Valves
High flow valves are located on the compressor hot gas and suction
tubes. Large black plastic caps distinguish these valves with
O- -rings located inside the caps. These valves can not be accessed
for service in the field. Ensure the plastic caps are in place and tight
or the possibility of refrigerant leakage could occur.

TROUBLESHOOTING

Refer to the Troubleshooting Chart (Table 10) for troubleshooting
information.

START- -UP CHECKLIST

Use the Start- -Up Checklist at the back of this manual.
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