Carrier 48SX024-048 - Manual (Page 43)

A CAUTION
When servicing gas train, do not hit or plug orifice spuds.
REMOVAL OF GAS TRAIN
1. Shut off manual gas valve.
2. Shut off power to unit
3. Remove burner access panel. (See Fig. 32.)
4. Disconnect gas piping at unit gas valve.
5. Remove wires connected to gas valve. Mark each wire
6. Remove ignitor and sensor wires at the ignitor module.
7. Remove the mounting screw that attaches the burner rack
to the basepan. (See Fig. 31.)
8 Slide the burner rack out of the unit. (See Fig. 31 and
34.)
9. To reinstall, reverse the procedure outlined above.
Straighten bent fins with a fin comb. If coated with dirt or
lint, clean the coils with a vacuum cleaner, using the soft
brush attachment. Be careful not to bend the fins. If coated
with oil or grease, clean the coils with a mild detergent-
and-water solution. Rinse coils with clear water, using a
garden hose. Be careful not to splash water on motors, in­
sulation, wiring, or air filter(s). For best results, spray con­
denser coil fins from inside to outside the unit. On units
with an outer and inner condenser coil, be sure to clean be­
tween the coils. Be sure to flush all dirt and debris from the
unit base.
Inspect the drain pan and condensate drain line when in­
specting 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.
Condenser Fan
Fig. 34 — Burner Rack Removed
Condenser Coil, Evaporator Coil, and Conden­
sate Drain Pan
— Inspect the condenser coil, evapo­
rator coil, and condensate drain pan at least once each year.
Proper inspection and cleaning requires the removal of the
unit top. See Unit Top Removal section on page 39.
The coils are easily cleaned when dry; therefore, inspect
and clean the coils either before or after each cooling sea­
son. Remove all obstructions, including weeds and shrubs,
that interfere with the airflow through the condenser coil.
A 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.
2 .
3.
4.
6
.
Remove 2 screws at bottom and 2 screws along sides of
condenser air intake grille and remove plastic grille.
Inspect the fan blades for cracks or bends.
If fan needs to be removed, loosen the setscrew and slide
the fan off the motor shaft.
When replacing fan blade, position blade so that lead­
ing edge is
‘/2 in. in front of fan orifice. See Fig. 22.
Ensure that setscrew engages the flat area on the motor
shaft when tightening.
Replace grille.
Electrical Controls and Wiring — Inspect and check
the electrical controls and wiring annually. Be sure to turn
off the gas supply, and then the electrical power to the unit.
Remove the control, blower, and compressor compart­
ment access panels 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, re­
place all the panels. Start the unit, and observe at least one
complete heating cycle and one complete cooling cycle to
ensure proper operation. If discrepancies are observed in
either or both operating cycles, or if a suspected malfunc­
tion has occurred, check each electrical component with the
proper electrical instrumentation. Refer to the unit wiring
label when making these checkouts.
NOTE: Refer to the heating and/or cooling sequence of op­
eration in this publication as an aid in determining proper
control operation.
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