Condenser Fan; Electrical Controls And Wiring; Refrigerant Circuit; Evaporator Airflow - Payne PA1Z Installation, Start-Up And Service Instructions Manual

splash water on motors, insulation, wiring, or air filter(s). For
best results, spray condenser-coil fins from inside to outside
the unit. On units with an outer and inner condenser coil, be
sure to clean between the coils. Be sure to flush all dirt and
debris from the unit base.
Inspect the drain pan and condensate drain line when
inspecting the coils. Clean the drain pan and condensate drain
by removing all foreign matter from the pan. Flush the pan
and drain tube with clear water. Do not splash water on the
insulation, motor, wiring, or air filter(s). If the drain tube is
restricted, clear it with a ''plumbers snake'' or similar probe
device. Ensure that the auxiliary drain port above the drain
tube is also clear.
V. CONDENSER FAN
CAUTION: Keep the condenser fan free from all
obstructions to ensure proper cooling operation. Never
place articles on top of the unit. Damage to unit may
result.
1. Shut off unit power supply.
2. Remove condenser-fan assembly (grille, motor, motor cover,
and fan) by removing screws and flipping assembly onto
unit top cover.
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 21.
5. Tighten setscrews.
6. Replace condenser-fan assembly.
Fig. 21 — Condenser-Fan Adjustment
VI. ELECTRICAL CONTROLS AND WIRING
Inspect and check the electrical controls and wiring annu-
ally. Be sure to turn off the electrical power to the unit.
Remove the top panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten
all screw connections. If any smoky or burned connections
are noticed, disassemble the connection, clean all the parts,
restrip the wire end and reassemble the connection properly
and securely.
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 with the proper elec-
trical instrumentation. Refer to the unit wiring label when
making these checkouts.
NOTE: Refer to the Sequence of Operation section on
page 14, as an aid in determining proper control operation.
VII. REFRIGERANT CIRCUIT
Inspect all refrigerant tubing connections and the unit base
for oil accumulations annually. Detecting oil generally indi-
cates a refrigerant leak.
If oil is detected or if low cooling 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 on
page 11.
If no refrigerant leaks are found and low cooling perfor-
mance is suspected, refer to Refrigerant Charge section on
page 11.
VIII. EVAPORATOR AIRFLOW
The cooling airflow does not require checking unless im-
proper 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 Indoor Airflow and Airflow Adjustments section on
page 14 to check the system airflow.
IX. METERING DEVICES
Refrigerant metering devices are fixed orifices and are
located in the inlet header to the evaporator coil.
X. LIQUID LINE STRAINER
The liquid line strainer (to protect metering device) is made
of wire mesh and is located in the liquid line on the inlet side
of the metering device.
—17—