Gardner Denver ELECTRA-SAVER II Service Manual page 47

SECTION 9
TROUBLE SHOOTING
IF UNIT FAILS TO START,
check
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Wiring system for wrong lead connections
Temperature and/or pressure shutdown reset on
control panel and/or reset relay in control box
Fuses in control enclosure or starter enclosure.
Compressor motor starter overload heaters and
adjusting knob
Oil cooler fan motor overload heaters and adjusting
knob
Low oil pressure or faulty low oil pressure switch
Contacts of timing relay for low oil pressure shut-
down stuck
open
Faulty timing relay.
Reduced voltage starter only — starting phase time
set too long
Reservoir pressure switch setting
UNIT STARTS BUT STOPS AFTER A SHORT RUN,
check
1.
2.
3.
4.
5.
6.
7.
8.
9
High
(a)
(b)
(c)
(d
(e)
(f
(9)
(h)
(i)
(j
air discharge temperature caused by
Low compressor oil level
Clogged oil cooler or oil filters
Thermal control (thermostatic mixing) valve in
operative
Dirt on oil cooler core faces
Poor ventilation of unit and/or oil cooler.
Water control valve inoperative
Water inlet temperature too high
Water shutoff valve inoperative
On remote oil cooler unit pilot-operated valve
or check valve in piPing to oil cooler inoperative
Reservoir pressure switch setting
Fuses in control panel enclosure or starter enclosure
Compressor motor starter overloads and adjusting
knob
Oil cooler fan motor overload heaters and adjusting
knob
Low oil pressure or faulty low oil pressure shutdown
switch.
Time delay on timing relay for low oil pressure shut-
down set too short a time
MAXIMUM DELAY
SETTING IS 15 SECONDS.
Timing relay setting screw not engaged
(a)
Faulty or intermittent HDTS or probe.
(b) Incorrect HDTS setting (225° F. is maximum).
Faulty timing relay.
COMPRESSOR DOES NOT UNLOAD,
check
1. Magnetic unloader or pressure switch for mal
function
2.
3.
4.
5.
6.
7.
8.
Control lines for restriction
Air leaks in control system.
Inlet valve stuck open due to corrosion
Inlet valve disc not sealing
Broken inlet valve stem spring
Pilot or pressure switch adjustment
Pilot or pressure switch for dirt or leaking
diaphragm
PNEUMATIC BLOWDOWN VALVE CONTINUES TO
PASS AIR, check for
1. Loose or broken air line to blowdown valve pilot
2.
Loose wiring to the blowdown valve actuator solenoid
3.
Coil failure on the blowdown valve actuator solenoid
4.
Pressure regulator not set to correct pressure.
EXCESSIVE OIL CONSUMPTION,
check for
1. Oil carryover through discharge line caused by
(a)
Overfilling the reservoir.
(b) Clogged broken or loose oil return lines
(c)
Ruptured oil separator elements
(d Loose assembly.
(e)
Incorrect oil causing foam
(f
Inoperative minimum pressure valve
2. Oil leaks at all fittings and gaskets
3. Oil leaking into water system of oil cooler.
COMPRESSOR LOW ON DELlVERY AND PRES-
SURE,
check for
1.
2.
3.
4.
5.
6.
7.
13-9-630 Section 9
Clogged air filter.
Restricted inlet valve
Corrosion in inlet valve causing sticking
Broken inlet valve stem spring.
Binding inlet valve piston.
Incorrect motor speed
Pressure gauge faulty.
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