Troubleshooting; Troubleshooting Guide - Sullair LS-20S Operator's Manual And Parts List

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 efficiency
decrease of a dirty heat exchanger.
A detailed visual inspection is worth performing for

7.7 TROUBLESHOOTING GUIDE

SYMPTOM
COMPRESSOR WILL NOT START:
POWER LED OFF
MOTOR OL MESSAGE
T- -1, T- -2 FAIL MESSAGE
P-1, P-2, P-3, P-4
FAIL MESSAGE
MOTOR WILL NOT START,
E- -STOP MESSAGE
LO WATER MESSAGE
(Water- -cooled packages only)
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND:
MOTOR OL MESSAGE
P1- -LO
P3-LO
HI T1, HI T2 MESSAGE
PROBABLE CAUSE
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Temperature Transducer Failure
Pressure Transducer Failure
Emergency Switch Open
(depressed)
Water Pressure Feed Below 10 psig
(0.7 bar)
Motor Starter Overloads Tripped
Low Incoming Line Voltage
P1 is Less Than 10 psig (0.7 bar)
Loss of Oil
Plugged Oil Filter
P3 is Less Than One Half of P1
Discharge Temperature Exceeded
235_F (113_C) Because:
Ambient temperature exceeded
105_F (41_C)
MAINTENANCE
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.
REMEDY
Close switch.
Replace fuse.
Replace fuse.
Reset after heater elements cool
down. Should trouble persist,
check whether motor starter
contacts are functioning
properly.
Check voltage. Should voltage
check low, consult power
company.
Check connections from
transducer. If adequate,
replace transducer.
Check connections from
transducer. If adequate,
replace transducer.
Close switch (pull).
Check cooling water supply (i.e.,
closed valves).
Reset after heater elements cool
down. Should trouble persist,
check whether motor starter
contacts are functioning properly.
Check voltage. Should voltage
check low, consult power com- -
pany.
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.
Check oil level.
Replace filter.
Improve local ventilation (i.e.,
remote intake of process and/or
cooling air.
Section 7
37