Carrier 48HG14---28 User's Information Manual

Contents

Carrier 48HG14---28 User's Information Manual Manual pdf 6 page image

6TO LIGHT UNIT (UNITS WITHCOMFORTLINK™ CONTROL)(CONTINUED)See Fig. 1 for location of gas valve. Refer to Fig. 3 whileproceeding with the following steps.Step 1 — Turn off the unit demand for cooling or heating byusing the Scrolling Marquee. The Scrolling Marquee is located inthe control box at the compressor end of the unit.a. Push the ESCAPE key until a blank display screen isshown.b. Push the DOWN arrow key until the SERVICE TESTLED is lit.c. Push the ENTER key. The display will show TEST.d. Push the ENTER key again. The NO/YES display willflash.e. Push the UP or DOWN key to toggle the display toYES and then push ENTER . The unit will be lockedoff from heat, cooling or any operation. The controlswill still function and the display will still operate.NOTE: A password may be required to change Service Testvalues depending on previous settings configured in the unit.Default password is “1111.”Step 2 — Close the external gas pipings manual shut off valvelocated outside the unit.Step 3 — Turn off the electrical supply to the unit andinstall lockout tag.Step 4 — Remove the heat section access panel.Step 5 — Turn the Off/On selector switch on the gas valve tothe OFF position and wait 5 minutes.Step 6 — Move the Off/On selector switch on the gas valve tothe ON position.Step 7 — Replace the heat section access panel.Step 8 — Remove lockout tag and turn on the electrical supplyto unit.NOTE: Normal operation will automatically begin. Service Testmode will automatically end (exit) after a recycle of power.Step 9 — Open the external gas pipings manual shut off valvelocated outside the unit.Step 10 — Using the Scrolling Marquee, enable the unit to runusing the following procedure:a. Push the ESCAPE key until a blank display screen isshown.b. Push the DOWN key until the SERVICE TEST LED islit.c. Push the ENTER key. The display will show TEST.d. Push the ENTER key again. The NO/YES display willflash.e. Push the UP or DOWN key to toggle the display to NOand then push ENTER . The unit will return to normaloperation and exit SERVICE TEST mode.Step 11 — To test the operation of the gas section, use theScrolling Marquee test routine to energize the gas outputs and toturn on the gas.Step 12 — For normal operation, make sure that the set pointsare at the normal heat set points.FIRE, EXPLOSION HAZARDFailure to follow this warning could result in personal injury,death, and/or property damage.If the main burners fail to light, or the blower fails to come on,shut down gas heating section and call your dealer for service.! WARNINGTO SHUT UNIT OFF(UNITS WITH THERMOSTAT CONTROL)FIRE HAZARDFailure to follow this warning could result in personal injury,death, and/or property damage.Do not turn off the electrical power to unit without first turningoff the gas supply. Should the gas supply fail to shut off or ifoverheating occurs, shut off gas valve to the unit beforeshutting off the electrical supply. Make sure to apply lockouttags.! WARNINGSee Fig. 1 for location of gas valve. Refer to Fig. 4 whileproceeding with the following steps.Step 1 — Set room thermostat to lowest temperature setting andset SYSTEM switch to OFF position.Step 2 — Close the external gas pipings manual shut off valvelocated outside the unit.Step 3 — Turn off the electrical power supply to the unit andinstall lockout tag.Step 4 — Remove the heat section access panel.Step 5 — Turn the control dial on the main gas valvecounterclockwise to the OFF position.Step 6 — Replace 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 thecooling system during the cooling season.TO SHUT UNIT OFF(UNITS WITH COMFORTLINK™CONTROL)FIRE HAZARDFailure to follow this warning could result in personal injury,death, and/or property damage.Do not turn off the electrical power to unit without first turningoff the gas supply. Should the gas supply fail to shut off or ifoverheating occurs, shut off gas valve to the unit beforeshutting off the electrical supply. Make sure to apply lockouttags.! WARNINGSee Fig. 1 for location of gas valve. Refer to Fig. 5 whileproceeding with the following steps.