Sullair LS-20S - General Troubleshooting Information; Troubleshooting Guide

Section 7
MAINTENANCE
37
7.6 TROUBLESHOOTING
The foregoing information has been compiled from
operational experience with your package. It identi-
fies symptoms and diagnosis of SEVERAL probable
difficulties, but NOT ALL of those possible.
The systematic collection of operational data cannot
be over--emphasized, as it may give evidence of the
presence (or not) of a fault before it turns into a seri-
ous breakdown -- for example, the vibrations signa-
ture increase of a damaged bearing, or the ef ficiency
decrease of a dirty heat exchanger.
A detailed visual inspection is worth performing for
almost all problems and may avoid unnecessary ad-
ditional damage to the compressor. Always remem-
ber to:
1. Check for loose wiring.
2. Check for damaged piping.
3. Check for parts damaged by heat or an electrical
short circuit, usually apparent by discoloration or a
burnt odor .
Should your problem persist after making the recom-
mended check, consult your nearest Sullair repre-
sentative or the Sullair Corporation factory toll free at
1--800--SULLAIR.
7.7 TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NOT START: Main Disconnect Switch Open Close switch.
POWER LED OFF Line Fuse Blown Replace fuse.
Control T ransformer Fuse Blown Replace fuse.
MOTOR OL MESSAGE Motor Starter Overloads Tripped Reset after heater elements cool
down. Should trouble persist,
check whether motor starter
contacts are functioning
properly.
Low Incoming Line Voltage Check voltage. Should voltage
check low, consult power
company.
T--1, T--2 FAIL MESSAGE Temperature Transducer Failure Check connections from
transducer. If adequate,
replace transducer.
P-1, P-2, P-3, P-4 Pressure Transducer Failure Check connections from
FAIL MESSAGE transducer. If adequate,
replace transducer.
MOTOR WILL NOT START, Emergency Switch Open Close switch (pull).
E--STOP MESSAGE (depressed)
LO WATER MESSAGE Water Pressure Feed Below 10 psig Check cooling water supply (i.e.,
(Water--cooled packages only) (0.7 bar) closed valves).
COMPRESSOR SHUTS DOWN Motor Starter Overloads Tripped Reset after heater elements cool
WITH AIR DEMAND: down. Should trouble persist,
MOT OR OL MESSAGE check whether motor starter
contacts are functioning properly.
Low Incoming Line Voltage Check voltage. Should voltage
check low, consult power com--
pany .
P1--LO P1 is Less Than 10 psig (0.7 bar) First, check starter wiring. If dis--
charge pressure above 10 psig
(0.7 bar) was evident, then sensor
is at fault -- check connections
from transducer. If adequate,
replace transducer.
P3-LO Loss of Oil Check oil level.
Plugged Oil Filter Replace filter.
P3 is Less Than One Half of P1
HI T1, HI T2 MESSAGE Discharge Temperature Exceeded
235
_
F(113
_
C) Because:
Ambient temperature exceeded Improve local ventilation (i.e.,
105
_
F(41
_
C) remote intake of process and/or
cooling air.