Ingersoll-Rand R Series, Инструкция по установке, эксплуатации и обслуживанию

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7. Trouble Shooting Guide
COMPRESSOR WILL NOT START. NO HUM:
• Line disconnect switch open. Close switch.
• Fuse removed or blown. Replace fuse.
• Overload tripped. Wait 5 to 20 minutes to reset. Check ambient
and inlet air temperatures, operating pressure and air flow rates
against rated capacities listed, to determine cause of overload.
• Loose or improper wiring. Check connections against schematic.
Tighten loose connections.
• Safety controls tripped (oil, temperature, refrigerant). Test controls
for malfunction by jumpering. Look for reason device tripped (high
head, low suction, oil loss). Correct any malfunctions such as
dirty condenser, high ambient, overloads. Replace faulty controls.
• Starter coils open or contact burnt. Replace coils and/or contacts.
COMPRESSOR WILL NOT START, HUMS, (Trips overload protector.)
• Loose or improper wiring
• Low line voltage, 10% of nameplate rating. Check line voltage with
voltmeter. Correct condition.
• Start winding open or shorted. Check with ohmmeter, referring to
motor schematic for correct value. Replace motor.
• Open or unbalanced phase ( 3 phase units). Check phases for
equal voltages (+/- 10%).
• Relay or contactor not closing. Examine contacts and coils for
burning, opens, shorts or sticking. Correct conditions.
• Compressor internal mechanical failure. Loss of oil may have
locked up compressor. If above steps do not apply, this may be
the cause. Replace compressor.
UNIT SHORT-CYCLES:
• Motor overload cutting out. Check for high head pressure air
overload, high ambient clogged condenser.
• Defective overload protectors. Check currents. Replace if neces-
sary.
• Low voltage or 3 phase unbalance. Voltages must be within 10%
on nameplate rating. Correct off specification conditions.
• Refrigerant shortage. Check for leaks. Repair and recharge.
• Low suction pressure or sticking expansion valve. Check valve
setting and operation. Adjust, repair or replace.
• Shorted motor winding.
LOW OR NO OUTLET AIR PRESSURE:
• Incorrect or restricted piping. Look for restrictions in lines or too
small pipe sizes. Replace piping if needed.
• Evaporator and/or precooler clogged. If clogged, reverse flow and
flush with mild detergent. Evaporator frozen. Turn unit off to thaw.