Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48EJ Installation And Service Instructions Manual

Also see for 48EJ: Installation, Start-Up and Service Instructions User manual

Contents

Main Burners — For all applications, main burners arefactory set and should require no adjustment.MAIN BURNER REMOVAL (Fig. 55)1. Shut off (field-supplied) manual main gas valve.2. Shut off power to unit.3. Remove heating access panel.4. Disconnect gas piping from gas valve inlet.5. Remove wires from gas valve.6. Remove wires from rollout switch.7. Remove sensor wire and ignitor cable from IGC board.8. Remove 2 screws securing manifold bracket to basepan.9. Remove 4 screws that hold the burner support plate flangeto the vestibule plate.10. Lift burner assembly out of unit.11. Reverse procedure to re-install burners.Filter Drier — Replace whenever refrigerant system isexposed to atmosphere.Protective DevicesCOMPRESSOR PROTECTIONOvercurrent — Each compressor has one manual reset, cali-brated trip, magnetic circuit breaker. Do not bypass connec-tions or increase the size of the circuit breaker to correct trouble.Determine the cause and correct it before resetting the breaker.Overtemperature — Each 06D type compressor (024-038 units)has an internal protector to protect it against excessively highdischarge gas temperatures.Fig. 50 — Belt Tension AdjustmentFig. 51 — Condenser-Fan AdjustmentFig. 52 — Cooling Charging Chart,48EJ,EK,EW,EY024-034Fig. 53 — Cooling Charging Chart,48EJ,EK,EW,EY038-04848