Bell & Gossett DN0132F Domestic Pump Vented Boiler Feed Units Series CME - Manual (Page 4)

4
TROUBLE SHOOTING PROCEDURES
All units ar e thoroughly tested at the factory before shipment.
They should operate satisfactorily without further adjustment if
properly installed and providing they have not been damaged
by rough handling in transit. If system or unit performance is
not satisfactory, refer to the following check list.
Pump Will Not Start
1.
The power supply has been interrupted, disconnect switch
is open, or selector switch is improperly positioned.
2. Incorrect voltage for motor. Check voltage and wiring with
motor characteristics.
3. Incorrect starter coil for power supply.
4. The overload relays and the starter have tripped out and
must be reset. Ambient temperature may be too high.
5. Check pump controls or other controls for proper operation.
6. Wiring to control cabinet is incorrect or connections are
loose.
7. The strainer is dirty thus retarding flow. Clean periodically.
8. Boiler is full or boiler control switch is defective.
9. The low water cut-off float switch is open due to low water,
incorrect adjustment or failure.
Pump Runs Continuously
1.
Pump is running backward. Rotation of three phase motors
may be corrected by interchanging any two of the three
wires. Rotation should be clockwise looking down on motor.
2. Steam traps are blowing through causing condensate to
return at excessive temperatures. This may reduce the
capacity of pump below its rating, depending on the unit
and type of pump furnished. Traps should be repaired or
replaced.
3. Pump discharge pressure is less than operating pressure of
the boiler.
4. The total required pressure at the pump discharge is greater
than the pressure for which the pump was designed. Check
the total pressure which includes atmospheric pressure, the
friction head and the static head.
5. A valve in the discharge line is closed or throttled too
tightly. Check valve is installed backwards.
6. The impeller eye is clogged.
7. Pump is too small for system.
Boiler Feed Pump is Noisy
1.
The pump is working against a lower pressure than
designed for. While pump is discharging, adjust plug cock in
discharge line until pressure at pump approaches pump
rated pressure.
2. Excessive condensate temperature. Correct system
conditions. However, this applies to certain units only;
others are designed to handle boiling water.
3. Magnetic hum or bearing noise in motor. Consult motor
manufacturer’s authorized service station nearest unit
location.
4. Starter chatters. Trouble is caused by low line voltage, poor
connections, defective starter coil, or burned contacts.
5. Pump is running backward.
The System is Noisy
1.
Banging in the steam mains is usually caused by steam
“imploding” in condensate lying in low points in lines. These
problems can be eliminated by dripping low points, prop-
erly supporting the pipe, or by increasing th pitch of the
lines.
2. Improper dripping of the steam mains and risers; where
there is a rise in the steam main, or where it branches off into
a riser, a drip trap must be installed in the drain line.
3. The piping is too small to drain properly.
4. A defective trap is holding condensate in steam supply line.
5. Defective check valve permits steam to vent thru pump into
the boiler feed tank.
6. A priming boiler is discharging water with the steam.
Consult boiler manufacturer.
Excessive W ater Overflow From Unit
1. Receiver sized too small to accommodate system surges.
2. Water make-up valve open or float switch set too high.
3. Water make-up valve leaks.
Morton Grove, Illinois 60053
TM
TM SERIES
MODEL
SERIAL
GPM PSI PUMP
CFM IN HG. PUMP
DWGS
POWER V. PH. HZ 60
CONTROL V. PH. 1 HZ 60
TOTAL LARGEST MOTOR
F.L. AMP F.L. AMP
DN0016
DEALER SER VICING
If tr ouble occurs that cannot be rectified, contact your local
B&G representative. He will need the following information in
order to give you assistance.
1. Complete nameplate data of pump and motor.
SEE RATING NAMEPLATE.
2. Suction and discharge pipe pressure gauge readings.
3. Ampere draw of the motor.
4. A sketch of the pump hook-up and piping.
5. Provide complete information on boiler control switches
and any motorized or solenoid valves in the boiler feed piping.