Summary of the content on the page No. 1
48HJ004-014
Single-Package Rooftop
Heating/Cooling Units
User’s Information Manual
NOTE TO INSTALLER: TO LIGHT UNIT
This manual should be left with the equipment owner.
1. Do not turn off the electrical power to unit without
WARNING: If the information in this manual is
first turning off the gas supply.
not followed exactly, a fire or explosion may
2. Before attempting to start the gas heating section,
result causing property damage, personal
familiarize yourself with all the procedures that m
Summary of the content on the page No. 2
Refer to Fig. 3 while proceeding with the following steps. INTAKE LOUVERS COMPRESSOR ACCESS PANEL Step 1 — Set room thermostat to lowest temperature setting and set SYSTEM switch to OFF. Step 2 — Close the external manual gas valve. Step 3 — Turn off the electrical power supply to unit; install lockout tag. Step 4 — Remove the compressor access panel. Step 5 — Move the gas valve switch to the OFF position. Step 6 — Replace compressor access panel. Step 7 — If unit is being shut down because
Summary of the content on the page No. 3
E E R R O O MAIN ON OFF STEP 1 STEP 2 STEP 3 SINGLE-STAGE GAS 2-STAGE GAS VALVE VALVE STEP 4 SINGLE-STAGE GAS 2-STAGE GAS VALVE VALVE 48HJD005,006* 48HJD005,006† 48HJE004-006* 48HJE004-006† 48HJF004-006* 48HJF004-006† 48HJD007-014 48HJG005,006 48HJE007-014 48HJH004-006 48HJF007-014 48HJK004-006 48HJL005,006 48HJM004-006 48HJN004-006 STEP 5 48HJD005,006† 48HJD005,006* 48HJE004-006† 48HJE004-006* 48HJF004-006† 48HJF004-006* 48HJG005,006 48HJD007-014 48HJH004-006 48HJE007-014 48HJK004-006 48HJF
Summary of the content on the page No. 4
E R O MAIN ON OFF STEP 1 STEP 3 STEP 2 STEP 4 SINGLE-STAGE GAS 2-STAGE GAS VALVE VALVE 48HJD005,006* 48HJD005,006† 48HJE004-006* 48HJE004-006† 48HJF004-006* 48HJF004-006† 48HJD007-014 48HJG005,006 48HJE007-014 48HJH004-006 48HJF007-014 48HJK004-006 48HJL005,006 48HJM004-006 48HJN004-006 *3-phase units only. †Single-phase units only. STEP 5 STEP 6 STEP 7 Fig. 3 — To Shut Unit Off 4 LOCK-OUT TAG W E R C S C HI M O F F ON M1 O P3 F F C2 ON L E C A L P WR
Summary of the content on the page No. 5
Units with outdoor air capability have a cleanable filter for ROUTINE MAINTENANCE AND CARE the outdoor air. This filter should be checked semi-annually FOR THE EQUIPMENT OWNER and cleaned as necessary with steam or hot water and a mild Consider the following information before maintaining or detergent. Do not use throwaway filters in place of cleanable servicing equipment: filters. . 1. TURN OFF GAS SUPPLY AND THEN ELECTRI- Never operate your unit without filters in place. Failure to CAL POWER T
Summary of the content on the page No. 6
Heat Exchanger Combustion Area and Vent System — The com- bustion area and vent system should be visually inspected be- NOTE: To ensure dependable and efficient heating operation, fore each heating season. The normal accumulation of dirt, the heat exchanger should be checked by a qualified mainte- soot, rust, and scale can result in loss of efficiency and improp- nance person before each heating season, and cleaned when er performance if allowed to build up. necessary. If your unit makes any unu
Summary of the content on the page No. 7
2. Inspection of all combustion- and ventilation-air passages and openings. 3. Close inspection of all gas pipes leading to and inside your unit. 4. Inspection and if required, cleaning of the condenser and evaporator coils. 5. Inspection, and if required, cleaning of the condensate drain pan. 6. Inspection and cleaning of blower wheel housing and motor. 7. Inspection of all supply- and return-air ducts for leaks, obstructions, and insulation integrity. Any problems found should be resolved at t
Summary of the content on the page No. 8
NOTE: Before proceeding with the next check, turn OFF the BEFORE YOU CALL FOR SERVICE, electrical power supply to the unit. Remove the control access CHECK FOR PROBLEMS door. THAT CAN BE EASILY SOLVED ( ) During the heating season, check the control switch on If insufficient heating or cooling is suspected: the gas valve. Is it in the ON position? If it is not, be sure it has ( ) Check for sufficient airflow. Check the air filter for dirt. not been turned off for the purpose of safety. If no saf
