SB-7-632 Page 22
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 “Maximum Operating Limitations”, FIGURE 4-1, below.
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 must 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 / MINIMUM OPERATING LIMITATIONS
SIZE
MAX.
RPM
MIN.
RPM
VERT.
MIN
RPM
HORIZ.
MAX.
PRESSURE
PSI
MAX
VAC
IN HG
MAX.
TEMPERATURE
RISE ° F
MAX.
DISCHARGE
TEMPERATURE ° F
3LR
3600
1528
1091
7
14
160
260
3MR
3600
1528
1091
12
15
180
280
3HR
3600
1528
1091
15
16
220
320
4LR
3600
1337
955
7
14
160
260
4MR
3600
1337
955
10
16
185
285
4HR
3600
1337
955
15
16
210
310
5LR
2850
1070
764
7
14
160
260
5MR
2850
1070
764
13
16
180
280
5HR
2850
1070
764
15
16
200
300
DO NOT EXCEED THESE LIMITS
NOTICE
Blower speed, line losses, elevation, and increased inlet temperatures will affect the maximum
operating limitations. The minimum RPM for the blowers is based on lubrication only. The blowers
may only be operated down to the minimum RPM, when the temperature rise and discharge
temperature are below the maximum limitations as shown.
FIGURE 4-1 – MAXIMUM / MINIMUM OPERATING LIMITATIONS
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