Carrier WeatherExpert 48LCD05 - Flue Gas Passageways; Combustion-Air Blower

23
Fig. 33 — LP Supply Line Low Pressure Switch
Wiring
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.
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-
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.
Fig. 34 — Heat Exchanger Assembly
PNK
W2
TSTAT
GRA
BRN
IGC
J2-12
IGC
J2-11
BRN
C
NO
MGV
C
LP LPS
FLUE BAFFLE
LOW NOX ONLY
HEATER TUBE
ASSEMBLY
SEAL STRIPS, SPONGE RUBBER
REGULATOR
GASKET
REGULATOR
BAFFLE ASSEMBLY
LOW NOX ONLY
RETAINER
SUPPORT
INSULATION
ASSEMBLY
WIND CAP ASSEMBLY
SHOWN INVERTED,
AS SHIPPED
BURNER ASSEMBLY
INDUCER FANMOTOR
ASSEMBLY