Carrier 48ES, Руководство по установке, Страница: 25 / 30

25
BLOWER
HOUSING
2 SETSCREWS
(HIDDEN)
C99085
Fig. 20 -- Removal of Motor and Blower Wheel
C99086
Fig. 21 -- Burner Rack Removed
OUTDOOR FAN
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.
CAUTION
!
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. (3.2 mm) away from the motor end (1/8 in. (3.2 mm)
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.
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
Annually inspect all refrigerant tubing connections and the unit
base for oil accumulations. Detecting oil generally indicates a
refrigerant leak.
EXPLOSION, PERSONAL INJURY 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.
!
WARNING
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.
EVAPORATOR 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 the Indoor Airflow and Airflow Adjustments section to check
the system airflow.
PURON ITEMS
METERING DEVICE (Thermostatic Expansion Valve )
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.
48E
S