8
Problem solving
Before carrying out any maintenance or repair, perform following steps:
• Stop the compressor and switch off the voltage.
• Open and lock the isolating switch to prevent an accidental start.
• Isolate the compressor by closing the outlet valve.
• Depressurize the system by opening the drain valve(s).
Compressor
Condition
Fault
Remedy
The compressor does
not start.
Pressure too high.
Compressor will start again when the
pressure drops to the starting pressure.
Loose connection.
Check all electrical connections.
Safety valve blows.
Pressure too high
Check settings and correct.
Safety valve opens too soon.
Replace valve.
Compressor capacity
or pressure below
normal.
Air consumption exceeds capacity of
compressor.
Check equipment connected.
Choked air inlet filter.
Remove and check filter. Replace if
necessary.
Safety valve leaking.
Replace valve.
Compressor element out of order.
Consult your supplier.
Compressor module
overheating or
compressor shutdown
on high air
temperature.
Insufficient compressor cooling.
Improve ventilation of compressor room.
Clean compressor element fins and fan,
see
Cleaning the compressor element
.
Cooling fan out of order.
Check and correct.
Condensate trap
continuously
discharging air an
water
Automatic drain out of order
Have the drain checked. Replace as
necessary
Refrigerant dryer
For compressors with a built-in refrigerant dryer also:
Condition
Fault
Remedy
Dew point too high
Air inlet temperature too high
Check and correct; see section
Reference conditions and limitations
Fuses blown
Check fuses and remedy the cause.
Shortage of refrigerant
Have circuit repaired or recharged.
Refrigerant compressor does not run
See below
Evaporator pressure is too high
See below
Condenser pressure is too high
See below
Instruction book
94
2920 7140 52
Summary of Contents for SF 15+
Page 1: ...INSTRUCTION BOOK OIL FREE SCROLL COMPRESSORS SF 15 SF 17 SF 22 SFD 11 SFD 15 SFD 22 ...
Page 2: ......
Page 16: ...2 2 Flow diagram Flow diagram of SF 15 SF 17 SF 22 Instruction book 14 2920 7140 52 ...
Page 18: ...Flow diagram of SFD 11 SFD 15 SFD 22 Instruction book 16 2920 7140 52 ...
Page 112: ......
Page 113: ......