BLOWER
HOUSING
(HIDDEN)
C99085
Fig. 20 - Removal of Induced-Draft Blower Assembly
ELECTRICAL CONTROLS AND WIRING
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access 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, re-strip 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 electrical
instrumentation. Refer to the unit wiring label when making these
checks.
REFRIGERANT CIRCUIT
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
Fig. 21 - Burner Rack Removed
OUTDOOR FAN
C99086
UNIT OPERATION HAZARD
Failure to follow this caution may result in damage to unit
components.
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off
motor shaft.
5. When replacing fan blade, position blade so that the hub is
1/8 in. away from the motor end (1/8 in .of motor shaft will
be visible) (See Fig. 12).
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
EXPLOSION, PERSONAL INJURY HAZARD
Failure to follow this warning could result in property
damage, personal injury or death.
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 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.
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.
METERING DEVICES
018 Model Onlv-TXV
This metering device is a hard shutoff, balance port TXV. The TXV
maintains a constant superheat at the evaporator exit resulting in
higher overall system efficiency.
024 through 060 Models-AccuRater Piston
Refrigerant metering device is a fixed orifice and is located in the
distributor assembly to the indoor coil.
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.
TROUBLESHOOTING
Refer to the Troubleshooting (:hart (Table 10-12) for
troubleshooting information.
START-UP CHECKLIST
Use the Start-Up Checklist at the back of this manual.
25
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