Flue Gas Passageways; Combustion-Air Blower - Carrier WeatherExpert 48LC Series Service And Maintenance Instructions

IGC
BRN C
J2-11
IGC
J2-12
TSTAT
W2 PNK
Fig. 33 — LP Supply Line Low Pressure Switch

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat
exchanger:
1. Remove the combustion blower wheel and motor assembly
according to directions in Combustion-Air Blower section.
See Fig. 34.
2. Remove the flue cover to inspect the heat exchanger.
3. Clean all surfaces as required using a wire brush.
WIND CAP ASSEMBLY
(SHOWN INVERTED,
AS SHIPPED)
BURNER ASSEMBLY
LP LPS
BRN
NO
MGV
GRA
Wiring
REGULATOR
GASKET
REGULATOR
BAFFLE ASSEMBLY
(LOW NOX ONLY)
RETAINER
SUPPORT
INSULATION
ASSEMBLY
Fig. 34 — Heat Exchanger Assembly

Combustion-Air Blower

Clean periodically to assure proper airflow and heating efficiency.
Inspect blower wheel every fall and periodically during heating
season. For the first heating season, inspect blower wheel bi-
C monthly to determine proper cleaning frequency.
To access burner section, slide the sliding burner partition out of
the unit.
To inspect blower wheel, shine a flashlight into draft hood open-
ing. If cleaning is required, remove motor and wheel as follows:
1. Slide burner access panel out.
2. Remove the 7 screws that attach induced-draft motor housing
to vestibule plate. (See Fig. 34.)
3. The blower wheel can be cleaned at this point. If additional
cleaning is required, continue with Steps 4 and 5.
4. To remove blower from the motor shaft, remove 2 setscrews.
5. To remove motor, remove the 4 screws that hold the motor to
mounting plate. Remove the motor cooling fan by removing
one setscrew. Then remove nuts that hold motor to mounting
plate.
6. To reinstall, reverse the procedure outlined above.
HEATER TUBE
SEAL STRIPS, SPONGE RUBBER
ASSEMBLY
INDUCER FAN-MOTOR
ASSEMBLY
23
FLUE BAFFLE
(LOW NOX ONLY)