Carrier WeatherMaster 48HC04 Service And Maintenance Instructions

Also see for WeatherMaster 48HC04 Series: Installation instructions

29Fig. 48 — LP Low Pressure Switch (Installed)Fig. 49 — LP Supply Line Low PressureSwitch WiringThis switch also prevents operation when the propane tank level islow, which can result in gas with a high concentration of impuri-ties, additives, and residues that have settled to the bottom of thetank. Operation under these conditions can cause harm to the heatexchanger system. Contact your fuel supplier if this condition issuspected.Flue Gas PassagewaysTo inspect the flue collector box and upper areas of the heatexchanger:1. Remove the combustion blower wheel and motor assem-bly according to directions in Combustion-Air Blower sec-tion. See Fig. 50.2. Remove the flue cover to inspect the heat exchanger.3. Clean all surfaces as required using a wire brush.Combustion-Air BlowerClean periodically to assure proper airflow and heating efficiency.Inspect blower wheel every fall and periodically during heatingseason. 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 ofthe unit (see Fig. 51).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 seven screws attaching the induced-draftmotor housing to the vestibule plate. (See Fig. 46.)3. The blower wheel can be cleaned at this point. If addi-tional cleaning is required, continue with Steps 4 and 5.4. Remove the blower from the motor shaft by removing twosetscrews.5. Removing motor: remove the four screws holding themotor to the mounting plate. Remove the motor coolingfan by removing one setscrew. Remove nuts that hold themotor to the mounting plate.6. Reverse the procedure outlined above to reinstall themotor.PNKW2TSTATGRABRNIGCJ2-12IGCJ2-11BRNC NOMGV CLP LPS