Pneumatech AD Series, Руководство пользователя, Страница: 19 / 24

18
TROUBLESHOOTING
The following conditions can cause abnormal operation or malfunction of the air dryer
• High inlet air temperatures
• High cooling water inlet temperatures
• Untreated cooling water
• Dirty condenser
• Low ambient temperatures
• Malfunctioning automatic drains at aftercooler, or dryer
• Refrigerant overcharge
• Leaky evaporator
• Electrical power supply more than ±10% of the rated
voltage
• Low inlet air pressures
• Contaminated cooling water
• Condenser water pressure below 35 PSIG
• High ambient temperatures
• Compressed air flow greater than rated capacity
• Undersized fuses
• Refrigerant undercharge
• Clogged air compressor air intake filter
If any of these symptoms are noticed, refer to
Troubleshooting Guide.
Table 1 — Troubleshooting Guide
Symptoms Cause Remedy
A. Unit does not run. 1. Motor line open.
2. Fuse
blown.
3. Tripped overload.
4. Safety controls open.
5. Air switch open. (Dead end
control)
6. Frozen
(locked) compressor.
7. Wiring improper or loose.
1. Close disconnect switch, to start.
2. Replace
fuse.
3. Turn switch off, wait 15 minutes,
check for overload condition.
4. Repair or replace.
5. Check air pressure. Adjust air
and/or switch. If defective repair or
replace.
6. Repair or replace.
7. Check wiring against diagram.
B. Unit short cycles. 1. Motor compressor overload cutting
out.
2. Shortage of refrigerant.
3. Suction pressure low.
4. Sticking expansion valve.
1. Check for high head pressure,
clogged condenser, high ambient,
or air overload. Check high
pressure cutout, repair or replace.
2. Repair leak and recharge.
3. Check hot gas bypass adjust,
repair or replace.
4. Repair or replace.
C. Compressor will not start – hums. 1. Improperly wired.
2. Low line voltage.
3. Starting capacitor defective.
4. Relay or contactor not closing.
5. Start winding open.
6. Single-phasing.
1. Check wiring against diagram.
2. Check voltage – correct.
3. Replace.
4. Check for reason – repair or
replace.
5. Check leads, if leads OK replace
motor.
6. Check fuses.