Bell & Gossett DN0153D HS Vacuum Heating Units Series HV - Manual (Page 10)

Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2013 Xylem Inc. DN0153D February 2013
DEALER SER VICE
If trouble 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 at right.
2. Vacuum readings.
3. Ampere draw of the motor.
4. A sketch of system piping.
Morton Grove, Illinois 60053
TM SERIES HV
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
HOFFMAN SPECIALTY ®
PUMP MAKES NOISE
1. The pump is working against a lower pressure than designed for.
While pump is discharging, adjust square headed steam cock in
discharge line until pressure at pump approaches pump rated
pressure. Secure adjustment of steam cock by tightening lock
nut.
2. Excessive condensate temperature. Correct system conditions.
3. Magnetic hum or bearing noise in motor. Consult motor manufac-
turer’s authorized service station nearest pump location.
4. Starter chatters. Trouble is caused by low line voltage, poor con-
nections, defective starter coil, or burned contacts.
5. Pump is running backward.
6. Water hammer when discharge valve closes:
(1) Adjust steam cock to reduce discharge velocity or
(2) Install surge chamber on boiler side of discharge check valve or
(3) Install additional check valve near boiler or
(4) Install discharge piping 1 or 2 sizes larger.
THE SYSTEM IS NOISY
1. Banging in the steam mains is usually caused by “imploding” in
condensate lying in low points in lines. These pockets can be
eliminated by “dripping” low points, properly supporting the pipe,
or by increasing the 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 to the drain line.
3. The piping is too small to drain properly.
4. A defective trap is holding condensate in radiation.
5. A priming boiler is permitting a carry-over of water with the steam.
A priming boiler is caused by:
(1) Oil or other foreign matter. Clean boiler thoroughly.
(2) A reduction of the steam liberating area due to too high a
water level in the boiler. Reduce water line.
(3) Overloading. Reduce firing rate.
(4) Undersized steam outlet area, resulting in velocities in excess
of 15 to 25 ft. per second.