Trouble Shooting - AADCO 737 Series Operating Instructions Manual

13.0

TROUBLE SHOOTING

13.1 COMPRESSOR (See Section 7.0).
13.2 Depress the PUMP switch.
compressor should start.
(a) PUMP SWITCH LAMP LIGHTS BUT COMPRESSOR DOES NOT
START.
greater, compressor cannot start. Depress POWER switch, so that air will
drain from ballast tank and compressor will start when input pressure falls
to 60-psig or less.
(1) Input pressure is less than 60-psig and compressor will not start.
Fuse is okay since PUMP switch lights.
pressure switch, the solid state relay, or the compressor.
NOTE:
(2) Check voltage between terminal #4 on solid state relay and neutral
on terminal strip TS-1. Voltage not present indicates problem is with
pressure switch. Confirm by removing pressure switch cover and
shunting between two outside terminals. Voltage should now appear
at terminal #4 on solid state relay and compressor should start. If so,
replace or reset pressure switch as in Section 14.0.
(3) Voltage is present at terminal #4 on solid state relay but compressor
does not start. Jump between terminals #1 and #2 on solid state
relay. If compressor starts, relay is defective and must be replaced.
(4) Compressor does not start after jumping between terminals #1 and
#2 on solid state relay. Problem lies with compressor assembly.
13.3 THE COMPRESSOR HAS BEEN IN OPERATION BUT HAS STOPPED
SUDDENLY. The unit passes all tests as in Section 13.2 (a) (1) through (4).
Problem must lie with cooling fan or compressor itself.
(a) Place hand under silencer housing and feel for exhaust air from cooling
fan when PUMP switch is on. If this exhaust air is not felt, remove cover
from silencer housing and observe fan rotation. If the fan is not running,
replace fan.
The PUMP switch lamp should light and the
Check INPUT PRESSURE gauge.
POWER IS ALWAYS PRESENT AT TERMINAL #1 OF AC
RELAY EVEN WHEN PUMP SWITCH IS OFF.
SHOCK, EXERCISE CARE WHEN WORKING IN THE AREA
OR WHEN CHANGING THE RELAY.
DISCONNECT POWER TO UNIT.
If reading is 60-psig or
Problem lies with the
TO AVOID
FOR SAFETY,
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