Carrier 48GS Operating And Maintaining Manual

Also see for 48GS Guide: Operating and maintaining guide

Contents

Your combination heating/cooling unit is equipped withan automatic direct spark ignition and power combustion blower.Do not attempt to light by hand; personal injury mayresult.TO LIGHT UNIT1. Do not turn off the electrical power to unit withoutfirst turning off the gas supply.2. Before attempting to start the gas heating section, fa-miliarize yourself with all the procedures that mustbe followed.If you do not follow these instructions exactly, a fire orexplosion may result, causing property damage, injury,or loss of life.Refer to Fig. 1. See Fig. 2 for location of gas valve. Referto Fig. 3 while proceeding with the following steps.Step 1 — Set the temperature selector on room thermo-stat to the lowest temperature setting and set system switchto HEAT.Step 2 — Close the external manual shutoff valve.Step 3 — Turn off the electrical supply to the unit.Step 4 — Remove the front access panel with a 5 ⁄16 -in.nut driver.Step 5 — Move the selector switch on the internal gasvalve to the OFF position and wait 5 minutes.Step 6 — Move the selector switch on the internal gasvalve to the ON position.Step 7 — Replace the front access panel.Step 8 — Turn on the electrical supply to unit.Step 9 — Open the external manual shutoff valve.Step 10 — Set the temperature selector on room thermo-stat slightly above room temperature to start unit. The induced-draft combustion-air fan will start. Main gas valve will openand main burners should ignite within 5 seconds. If the burnerdoes not light within 5 seconds, the ignition module will gointo a Retry mode after a period of approximately 22 sec-onds (following the 5-second ignition period).If the burners do not light within 15 minutes of the initialcall for heat, there is a lockout.Step 11 — Set the temperature selector on room ther-mostat to desired setting.1. If the main burners fail to light, or the blower failsto start, shut down gas heating section and call yourdealer for service.2. Never attempt to manually light the main burners onunit with a match, lighter, or any other flame. If theelectric sparking device fails to light the main burn-ers, refer to the following shutdown procedures, thencall your dealer as soon as possible.Failure to follow these requirements could result in seriouspersonal injury.TO SHUT UNIT OFFDo not turn off the electrical power to unit without firstturning off the gas supply.Failure to follow these procedures can result in seriousfire or personal injury.NOTE: If unit is being shut down because the heating sea-son has ended, make sure to turn on power to coolingsystem.If unit is being shut down because of a malfunction, callyour dealer as soon as possible.Should overheating occur or the gas supply fail to shutoff, shut off the manual gas valve to the unit before shuttingoff the electrical supply.Do not use this unit if any part has been under water. Im-mediately call a qualified service technician to inspect theunit and to replace any part of the control system and anygas control which has been under water.Refer to Fig. 4 while proceeding with the following steps.Step 1 — Set the temperature selector on room thermo-stat to lowest temperature setting and set system switch toOFF.Step 2 — Close the external manual shutoff valve.Step 3 — Turn off the electrical power supply to the unit.Step 4 — Remove the front access panel.Step 5 — Move the selector switch on the internal gasvalve to the OFF position.Step 6 — Replace the burner access panel.Step 7 — Restore electrical power to the unit and set sys-tem switch to COOL to ensure operation of the cooling sys-tem during the cooling season.FRONTACCESSPANELFig. 1 — Gas Heating/Electric Cooling Unit(Unit 48GS Shown)2