Operation 39
d
If the compressor is mounted on a vehicle, and the vehicle needs to be moved, work is
completed for the day, or the compressor needs maintenance, you must relieve all
pressure from the system. Turn off the compressor normally and allow the blowdown
cycle to complete. Then, drain all air using the service valve located on the truck. Close
the valve once the air release is complete.
WARNING
Federal law prohibits moving a compressor without first releasing all air.
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 140
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