Sunco Gardner Denver Sutorbilt Legend GAA P Series, Parts List Operating And Service Manual

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SB--7--621 Page 10
SECTION 4
OPERATION
Future operating problems can be avoided if proper
precautions are observed when the equipment is first
put into service.
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 follow-
ing tabulation.
Operating beyond the specified oper-
ating 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 exces-
sive 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.
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 7, below.
MAXIMUM OPERATING LIMITATIONS
PRESSURE VACUUM DISCHARGE
SIZE RPM PSI IN HG TEMPERATURE
_
F
2LP 5275 7 14 285
2MP 5275 12 15 315
3LP 3600 7 14 260
3MP 3600 12 15 280
3HP 3600 15 16 320
4LP 3600 7 14 260
4MP 3600 10 16 285
4HP 3600 15 16 310
5LP 2850 7 14 260
5MP 2850 13 16 280
5HP 2850 15 16 300
DO NOT EXCEED THESE LIMITS
FIGURE 7 -- MAXIMUM OPERATING LIMITATIONS
Blower speed, line losses, elevation, and increased inlet temperatures
will affect the maximum operating limitations.