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CAUTION
Do not touch hot surfaces.
The upper limit of the blower operation is 445° F (229° C) Do not touch
the blower while it is in operation and assure blower is cool when not in
operation.
CAUTION
Use of a thermowell insulates the thermocouple. Invalid and delayed
readings will result. This can result in ineffective protection devices.
NOTE
The upper temperature limits are not intended for continuous operation.
Consult with factory for detailed information assistance.
6.4 STOPPING
CAUTION
Do not stop the blower if there are high outlet pressures in the outlet piping.
Unload the outlet piping prior to shutting down the blower.
Stop the blower by turning off the motor. Isolate the blower from the vacuum system and vent the blower
to atmosphere. Turn off the cooling water, if water cooled. Stop the backing pump. Refer to component
instruction manual.
6.5 WATER INJECTED BLOWERS
Water injected into the inlet of a blower operating on vacuum service will cool the blower. The water absorbs
the heat of compression as it passes through the unit along with the air/gas being compressed. A blower
cooled in this manner can operate safely at higher vacuums or higher inlet temperatures than a normally
uncooled unit.
The amount of water required depends on the inlet air/gas temperature, inlet vacuum, water temperature,
and the maximum discharge temperature desired. Check with the factory or sales representative for
additional guidance.
6.5.1 OPERATION
1. Check oil level in sight glass of blower and assure all fi ttings are tight.
2. Check the water injection system to assure water is available.
3. Operate the blower dry for a few minutes at no load to check correct rotation and smooth operation.
4. Turn water on and adjust fl ow as recommended for the individual blower. Assure water discharges
freely from the outlet piping.
5. Apply vacuum and observe operation at the desired inlet condition.
6.5.2 SHUTDOWN
1. The blower can be shutdown for brief periods by relieving the inlet vacuum, shutting the water off, and
then stopping the unit.
2. Rusting during a slightly longer shutdown period can be avoided by operating the blower under a partial
vacuum without the water injection, allowing the blower to heat within safe limits. The heat will tend to
drive off residual moisture.
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