24
OF2
OF1
ON
QUIET
SHIFT
120
30
60
60
30
90
INTERVAL TIMER
OFF
P3
DFT
O R W
2
Y C
T2 C C O
DFT
T1 Y
P1
J1
SPEEDUP
Speedup
Pins
Defrost interval
DIP switches
Quiet
Shift
A08020
Fig. 19 -- Defrost Control
Step 3 — Outdoor Fan
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. Remove 6 screws holding outdoor grille and m otor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan bl ades for cracks or bends.
4. If fan needs to be rem oved, loos en setscrew and s lide fan of f
motor shaft.
5. W hen replacing fan blade, position blade back to same posi-
tion as before.
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
Step 4 — Electrica l Controls and W iring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panels (see Fig 22 ) to locate all the electrical
cont rols and wiring. Check all electrical connections for tightness.
Tighten all screw connections. If any discolored 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 w iring, replace all the
panels. Start the unit, and observe at least one com plete cooling
cycle to ensure proper operation. If discrepancies are observed in
ope rating cycle, or if a suspected malfunction has occurred, check
each electrical component with the proper electrical
instrumentation. Refer to the unit wiring label when making these
checkouts.
Step 5 — 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 6 — Indoor Airflow
The heating and/or cooling airflow does not require checking
unl ess improper performance is suspected. If a problem exists, be
sure that all supply--air 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 to check
the system airflow.
Step 7 — Metering Devi ces--TXV & Pi ston
This unit uses 2 types of metering devices. The outdoor metering
device is a fixed orifice and is contained in the brass hex--body in
each liquid line feeding the outdoor coils. The indoor metering
device is a TXV type device.
607C-- --A
