Carrier 40GXC Service Manual

Also see for 38GXC: Installation instructions Owner's manual Owner's manual Product data

Contents

21DIAGNOSTIC CHARTS (CONT.)Outdoor coil clean? Clean coil. Problempersists?Indoor filter clean? Clean filter. Problempersists?Check indoor fanmotorReplace indoor fanmotor.Normal suction,high head?High head, highsuction?High head, lowsuction?YesYesYesNoNo NoProblem solvedProblem solvedNo NoNo NoNoYesYesYesYes Yes YesCheck applicationlimits.Non condensablesin sys. Pump downand recharge unitSee note below ** Restriction in system. Check capillary tube and check for damage to liquid line between indoor andoutdoor units.Connect low side gaugeat suction service valve.Measure discharge temp.*Unit is overcharged.Reclaim charge andweigh in correct chargeOutdoor coil clean? Clean coil. Problempersists?Indoor filter clean? Clean filter. Problempersists?Check indoor fanmotorReplace indoor fanmotor.Normal suction,high head?High head, highsuction?High head, lowsuction?YesYesYesNoNo NoProblem solvedProblem solvedNo NoNo NoNoYesYesYesYes Yes YesCheck applicationlimits.Non condensablesin sys. Pump downand recharge unitSee note below ** Restriction in system. Check capillary tube and check for damage to liquid line between indoor andoutdoor units.Connect low side gaugeat suction service valve.Measure discharge temp.*Unit is overcharged.Reclaim charge andweigh in correct chargeA09368Fig. 36 – Unit Not Running OptimallyVisually check outdoorUnit for ice blockage. **Check reversing valve.Go to flow chart 12NoYesYesCheck defrost sensor. Ok?Go to flow chart 2NoReplace sensorCheck application limits.Ok?* To supplement flow chart 9** Check for blockage on outdoor coil and drain pan. Are the holes in drain pans blocked?No Beyond operating rangeYesYesCheck ambient conditions.Prime icing?Explain to customerVisually check outdoorUnit for ice blockage. **Check reversing valve.Go to flow chart 12NoYesYesCheck defrost sensor. Ok?Go to flow chart 2NoReplace sensorCheck application limits.Ok?* To supplement flow chart 9** Check for blockage on outdoor coil and drain pan. Are the holes in drain pans blocked?No Beyond operating rangeYesYesCheck ambient conditions.Prime icing?Explain to customerA09369Fig. 37 – Unit Not Running Optimally (HP in Heating*)38/40GXC(Q)