HF-7-600 Page 12
SECTION 4
OPERATION
Future operating problems can be avoided if proper precautions are observed when the equipment is first
put into service.
NOTICE
Machines are shipped without oil in the sumps. Do not operate before adding lubricant.
Before starting under power, the blower should be turned over by hand to make certain there is no
binding, or internal contact.
Each size blower has limits on pressure differential, running speed and discharge temperature which
must not be exceeded. These limits are shown in the following tabulation. Refer to
FIGURE 4-1
, page 12.
Operating beyond the specified operating limitations will result in damage to the unit.
It is important that the pressures and temperatures are measured directly at the ports of the blower to
avoid error that may be caused by intervening pipe runs, fittings, etc.
Relief valves should be used to protect against excessive pressure or vacuum conditions. These valves
should be tested at initial startup to be sure they are adjusted to relieve at or below the maximum
pressure differential rating of the blower.
NOTICE
Relief valves should be placed as close as possible to the blower inlet or discharge.
In some instances, pressure may be relieved at a lower point than the blower maximum in order to protect
the motor or the equipment served by the blower.
Discharge temperature switches are recommended to protect against excessive inlet restriction or inlet
temperatures. Check valves in the discharge line on pressure blowers and in the inlet line on vacuum
blowers are recommended to protect the blower from motoring backwards when shut down under load.
LIMITATIONS
For information regarding limitations, refer to
FIGURE 4-1
, below.
MAXIMUM OPERATING LIMITATIONS
SIZE
RPM
PRESSURE
PSI
VACUUM
IN HG
TEMPERATURE
RISE ° F
DISCHARGE
TEMPERATURE ° F
HF 408
4000
15
16
250
350
HF 406
4000
15
16
250
350
DO NOT EXCEED THESE LIMITS
FIGURE 4-1 – MAXIMUM OPERATING LIMITATIONS
NOTICE
Blower speed, line losses, elevation, and increased inlet temperatures
will affect the maximum operating limitations.
