Table 5-1. Air Compressor Troubleshooting Chart - Cont
TEST OR INSPECTION
5. COMPRESSOR RUNNING HOT
Step 1. Check for blockage of air to fan wheel.
Remove any object that is blocking the air passage.
Clean up and remove any accumulated dust or dirt.
6. COMPRESSOR RUNNING SLOW
Step 1. Check for Low line voltage, or a defective motor starter heater.
Correct line voltage if low, or tighten loose connections.
Step 2. Check for a leaking release valve.
Replace a leaking release valve.
(1) Removal of burned out muffle.
(a) Remove three screws (1, fig. 5-1) from sides of the case and remove the backplate (2).
(b) Remove loose insulation blocks (3).
(c) Lay the furnace (6) on its face. Remove the thermocouple (4) from the instrument, marking each wire to
which terminal wire goes. Withdraw the thermocouple (4) from the hole. Remove the metal air vent from the hole.
(d) Remove the nuts and the wires from the muffle terminals.
(e) Remove the terminal plate.
(f) Remove the insulating blocks at the back of the muffle carefully, laying out both layers so that they may be
installed in the same order that they were taken out. Grasp lead wires. Gently work the muffle (5) unit out. Remove the
insulating sleeves from the muffle lead wire.