Carrier 48TC*D08 User Manual

Page 26

48TCDD08 only

C08238

All 48TC*D except DD08

C08239

Fig. 31 -- LP Low Pressure Switch (Installed)

PNK

TSTAT

GRA

BRN

IGC

J2-12

IGC

J2-11

BRN

MGV

LP LPS

C08285

Fig. 32 -- LP Supply Line Low Pressure Switch Wiring

This switch also prevents operation when the propane tank

level is low which can result in gas with a high

concentration of impurities, additives, and residues that

have settled to the bottom of the tank. Operation under

these conditions can cause harm to the heat exchanger

system. Contact your fuel supplier if this condition is

suspected.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the

heat exchanger:

1. Remove the combustion blower wheel and motor as-

sembly according to directions in Combustion--Air

Blower section. (See Fig. 33.)

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

opening. 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. 33.)

3. The blower wheel can be cleaned at this point. If ad-

ditional 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.

48TC