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6.) Thermostat inputs and remote network commands are ignored when Service Test mode is ON. NOTE: A password may be required to change Service Test values, depending on previous settings configured in the unit. Default password is “1111.” a. Press the ESCAPE key until a blank screen is shown. b. Use the arrow keys to scroll the red LED on the display to the “Service Test” position and press ENTER. c. The control will display the Field Service Test Mode (TEST) setting. Press ENTER once to select the TEST setting for configuration. Press ENTER again for “OFF” to begin flashing. d. Use the arrow keys to change the configuration from “OFF” to “ON,” then press ENTER to save the setting. Step 2 — Close the shutoff valve on the external gas supply piping. Step 3 — Turn off the electrical power supply to the unit and install lockout tag. Step 4 — Open the heat section access panel. Step 5 — Move ON/OFF switch on the internal gas valve to the OFF position. Step 6 — Close the heat section access panel. Step 7 — If unit is being shut down because of a malfunction, call your dealer as soon as possible. If unit is being shut down because the heating season has ended, restore electrical power to the unit to ensure operation of the cooling system during the cooling season. 6 7 LOCK-OUT TA G ON OFF MAIN STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 STEP 6 STEP 7 Two-Stage RTU gas valve Single-Stage RTU gas valve On/Off Switch On/Off Switch C08543 Fig. 4 -- To Shut Unit Off (Units with Electro--Mechanical Control) 48PD, 48PG 8 LOCK-OUT TAG ON OFF MAIN STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 STEP 6 STEP 7 Run Status Service Test Temperature Pressures Setpoints Inputs Outputs Configuration Time Clock Operating Modes Alarms Alarm Status ENTER MODE ESCAPE Two-Stage RTU gas valve Single-Stage RTU gas valve On/Off Switch On/Off Switch C08544 Fig. 5 -- To Shut Unit Off (Units with ComfortLinkt Control) 48PD, 48PG 9 CONTROL BOX AND COMPRESSOR ACCESS DOOR OUTDOOR AIR SCREEN FILTER ACCESS DOOR GAS SECTION ACCESS DOOR INDOOR MOTOR ACCESS DOOR CONDENSER COIL ACCESS DOOR C08545 Fig. 6 -- Panel and Filter Locations (48PG03--07 Shown) MAINTAINING YOUR UNIT All maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure. For your safety, keep the area around the unit clear and free of combustible materials, gasoline and other flammable liquids and vapors. To assure proper functioning of the unit, flow of combustion and ventilating air must not be obstructed from reaching the unit. Clearance of at least 6 ft on all sides is required. ROUTINE MAINTENANCE AND CARE FOR THE EQUIPMENT OWNER Before proceeding with those things you might want to maintain yourself, please carefully consider the following: FIRE, EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. 1.Turn off gas supply and electrical power to your unit before servicing or performing maintenance. 2. Do not turn off electrical power to this unit without first turning off gas supply and applying lockout tags. 3. When removing access doors or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care has been taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit. ! WARNING Air Filter(s) Air filters should be checked at least every 3 or 4 weeks and changed or cleaned whenever they become dirty. Table 1 indicates the correct filter size for your unit. Open the filter access panel to replace or inspect the filters. All units have filter tracks into which the filters slide. Remove the filters by pulling the filter slide outward from the track. See Fig. 6 for filter access panel location. Note the direction of flow arrows on the filter frame. If you have difficulty in locating your air filter in the return--air duct system, or if you have questions concerning proper filter maintenance, contact your dealer for instructions. When replacing your unit filters, always use the correct size and quantity as shown in Table 1. Filter tracks are field convertible for 2 or 4--in. thick filters. Verify airflow and duct static values, and related motor sizing and belt drive adjustment, if filter type or efficiency rating is changed from the original installation. Units with outdoor air capability have cleanable screens for the outdoor air. These screens should be checked annually and cleaned as necessary. FIRE AND EQUIPMENT DAMAGE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Never operate unit without filters in place. Damage to blower motor and/or compressors could result. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and in some cases, fire. ! WARNING 48PD, 48PG 48PD , 48PG 48PD, 48PG Table 1 – Indoor Air Filter Data FILTER QUANTITY FILTER SIZE 4 16x20x(2or 4) in UNITSIZE03---0708---1...

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