Industrial Air Division
152920 5997 03
8. Unit does not start
a. Electrical failure
a. Check or have electrical system checked. Check fuses in
motor starter
b. Overload relay cut out
b. Reset overload relay by means of knob (2-Fig. 3). If the
relay cuts out again after starting, see point 9 or 10
c. Air pressure above pre-set starting pressure
c. Compressor will start when air pressure is lower than pre-set
starting pressure of air pressure switch
9. Thermal overload relay cuts out during starting
a. Overload relay incorrectly set
a. Check and adjust. Reset relay
b. 2) Star-delta timer incorrectly set
b. Check setting, which should be 6 to 10 seconds
c. 2) Solenoid valve out of order
c. See 1i
d. 2) Unloader plunger jammed
d. See 1h
e. 2) Muffler choked
e. Replace muffler element
10. Thermal overload relay cuts out during operation
a. Overload relay incorrectly set
a. See 9a
b. One phase of mains supply line interrupted
b. Check fuses and line terminals for tightness. Check voltage
across motor line terminals
c. Supply voltage variations exceed normal tolerances
c. Consult power supplier
d. Ambient temperature too high
d. Improve ventilation of room
e. Motor stops and starts too frequently
e. See 6
f. Overcurrent due to motor or compressor failure
f. Measure motor line current in the three phases. If currents
exceed rated motor current, have compressor inspected; if
currents are not equal, have motor inspected
Notes
1) only LE/LT5, -6
2) not for LE/LT5, -6
3) only LT
4) not for LEN
d. See 1i
e. 2) Muffler choked
e. Replace muffler element
3. Air receiver pressure rises above maximum and causes
safety valve to blow
a. Air pressure switch incorrectly set or out of order
a. Set switch to unload compressor at rated maximum pressure.
Replace switch if it does not respond
b. 2) Solenoid valve defective
b. See 1i
c. 2) Unloader plunger jammed
c. See 1h
d. 2) Muffler choked
d. Replace muffler element
4. 3) Relief valve blows
a. Defective inlet valve in HP cylinder head
a. Inspect and replace part(s) as necessary
b. Relief valve not airtight
b. Replace valve
5. Receiver does not hold pressure
a. Check valve leaks
a. Check for broken valve and springs
b. Air leaks
b. Check and correct as necessary
6. Too frequent starting/too short operating periods
a. Air pressure switch incorrectly set
a. Increase pressure difference
b. Check valve leaks
b. See 5a
7. 4) High oil consumption
a. Oil level too high
a. Do not overfill crankcase. Keep level within lower half of
sight-glass
b. Breather valve malfunctioning
b. Replace breather valve
c. Piston ring(s) worn or broken
c. Have condition of piston rings checked
7 Principal data
Reference conditions
1. Inlet pressure (absolute) .......................... bar 1
2. Relative air humidity ................................ % 0
3. Air inlet temperature ................................ °C 20
Limitations
1. Minimum inlet temperature ....................... °C 0
2. Maximum inlet temperature ...................... °C 40
3. Maximum unloading pressure ................... bar(e) See below
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