ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 855

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.
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.
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.
For information regarding limitations, refer to FIGURE 4-1, below.
MAX.
SIZE
RPM
3LR 3600
3MR 3600
3HR 3600
4LR 3600
4MR 3600
4HR 3600
5LR 2850
5MR 2850
5HR 2850
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.
MIN. MIN MAX.
RPM RPM PRESSURE
VERT. HORIZ.
1528 1091
1528 1091
1528 1091
1337 955
1337 955
1337 955
1070 764
1070 764
1070 764
MAX
VAC TEMPERATURE
PSI IN HG
7 14
12 15
15 16
7 14
10 16
15 16
7 14
13 16
15 16
MAX.
DISCHARGE
RISE ° F TEMPERATURE ° F
160
180
220
160
185
210
160
180
200
MAX.
260
280
320
260
285
310
260
280
300
E-112