37-1-614 Page 19
SECTION 3
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 following tables and text in section 3.
GENERAL
– A new blower from the factory must be checked and serviced before operation. The blower
must be lubricated and operated according to the following instructions. Blower failure can be caused by
operation at above rated pressure or below rated minimum speed. Both cause excessive discharge
temperature and seizure of rotating parts.
STARTING BLOWER
– Start at reduced speed and no-load if possible. If speed is fixed, start without
load by bleeding discharge to atmosphere. Starting should be smooth and free of vibrations. After initial
no-load start, and operation is satisfactory, apply load gradually until maximum operating conditions are
attained. BE SURE OPERATING CONDITIONS ARE WITHIN BLOWER RATINGS. Maintain a close
check for severe vibrations, unusual noise, leaks and undue heating. The blower will gradually heat up
due to compression, but after a reasonable length of time, temperature will stabilize. With very cold
ambient conditions, warm up blower at no-load before going into full load service.
If the blower is used as part of a specific system, check the system’s manual for any procedures that may
be necessary when starting the blower.
PRESTART CHECK
(For New or Overhauled Blower) – see “Blower Startup Checklist,” page 24.
ROTATION
– Facing the main rotor drive shaft, rotation is clockwise when the shaft extension is at
discharge end, and counterclockwise when the shaft extension is at the inlet end. An arrow indicating
rotation is attached to the blower end cover near the drive shaft.
DAILY CHECK
1. Air filter tight, clean and serviced.
2. Proper oil level in oil sumps.
3. Observe
pressure.
4. Relief valve functions.
5. Blower turns freely.
Operating beyond the specified operating limitations will result in damage to the unit.
P
Series
Models
Drive Shaft
Speed
(RPM)
Discharge
Pressure*
Sea Level (PSIG)
Dry
Vacuum*
(Inches Hg)
Wet
Vacuum*
(Inches Hg)
7CDL11, 7CDL14, 7CDL17
4000
20
17
----
7CDL11, 7CDL14, 7CDL17
3600
----
----
24
* Pressures or vacuums are gauged at immediate blower discharge or inlet. For suggested
maximum ratings at reduced speeds, See (FIGURE 3-6, page 23).
FIGURE 3-1 – MAXIMUM RATING
