Operation 35
Sub-Zero Temperature Operating Instructions
For IMT rotary screw compressors (both shaft driven and hydraulically driven) sub-zero
temperature operation is defined as operation of the compressor when the oil temperature is
below 0º F. It is possible to operate an IMT rotary screw compressor when the ambient
temperature is below 0º F, as long as the oil temperature is above 0° F. Follow these guidelines
to protect the compressor:
1
MAINTENANCE REQUIREMENTS
If the IMT rotary screw compressor is expected to operate at temperatures below 0º F, the oil
filter, coalescer, air filter, and oil should be changed before the compressor is run in sub-zero
temperatures (ex: late fall, but this may vary by location and environment). Performing this
maintenance will improve the performance of the system during sub-zero temperature
operation. Use only IMT approved rotary screw compressor oils and filters.
2
STORAGE REQUIREMENTS
The IMT rotary screw compressor should be stored at or above 0º F. If the ambient
temperature is below 0º F the vehicle should be stored inside, preferably in a heated
environment. After moving the vehicle from the heated environment, the compressor system
should be operated for 15 minutes before proceeding to a job site. During this time, the
service valve must be slightly ajar such that the pressure gauge reads between 100 and 125
psi. This ensures that the oil temperature has had adequate time to come up to operating
temperature, and that most of the water in the system has been removed. This will allow for
approximately one hour of travel time before the oil cools to ambient temperature. If an
extended driving time is expected, the operator may need to stop driving and run the system
for 15 minutes every hour to ensure that the oil temperature does not cool to below 0º F.
The operator should use his/her judgment when deciding what interval is needed between
running the compressor to warm the oil. Lower ambient temperature will require more
frequent warming of the compressor oil.
3
FAILURE TO FOLLOW MAINTENANCE AND STORAGE REQUIREMENTS
At temperatures below 0º F, failure to follow the guidelines may result overheating of the
compressor due to the oil’s inability to circulate through the compressor system. The lack of
circulation leads to rapid warming of the compressor air end, and eventually the compressor
air end will exceed the maximum operating temperature. If the system shuts down due to
high temperature during sub-zero temperature operation, the oil will need to be warmed
before restarting. This may require moving the vehicle to a heated location or waiting for the
ambient temperature (and therefore the oil temperature) to exceed 0º F.
CAUTION
Failure to adhere to these guidelines and repeated running of the compressor to high
temperature shutdown may result in permanent damage to the air end.
Summary of Contents for CAS2545
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Page 15: ...Section 1 Compressor Introduction 13 CAS2545 Performance Charts...
Page 16: ...14 IMT CAS2545 Air Compressor Manual Part No 99904145...
Page 17: ...Section 1 Compressor Introduction 15...
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Page 71: ...Parts 69 Electrical Schematic 77441156...
Page 72: ...70 IMT CAS2545 Air Compressor Manual Part No 99904145 Hydraulic Schematic 99904155...
