TM-5-4310-389-14
Table 3-2. Unit Troubleshooting Procedures (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COMPRESSOR (Contd)
8.
Condensate drain system not draining (cold weather only).
Step 1. Check to see if condensate heater switch and light are on.
Step 2. Check fuse. Replace. Notify Direct Support Maintenance.
9. No oil pressure.
Step 1. Check to see if there is air trapped in the oil pump. Vent pump and line. Notify Direct
Support Maintenance.
10.
Compressor output insufficient.
Step 1. Check to see if intake filter is clogged. Replace filter element.
Step 2. Check intermediate stage pressures.
Step 3. Check engine compressor rpm. Adjust as required. Notify Direct Support Maintenance.
11.
Safety valves between individual stages releasing pressure.
Step 1. Check intermediate stage pressure. Notify Direct Support Maintenance.
Step 2. Check to see if valves are not closing properly. Notify Direct Support Maintenance and
clean valves.
12.
Compressor overheats (shutdown activates).
Step 1. Check to see if intake or outlet valves are not closing properly. Notify Direct Support
Maintenance.
Step 2. Check to see if there is an insufficient supply of cooling air. Move to location which permits
adequate air for cooling and observe ambient temperature for operation.
Step 3. Check to see if cooling fins are dirty. Clean.
13.
Automatic condensate drains do not unload.
Step 1. Check to see if condensate drain valve piston is jammed. Dismantle drain valve; clean or
replace piston. Notify Direct Support Maintenance.
3-13
