Bell & Gossett DN0153D HS Vacuum Heating Units Series HV - Manual (Page 6)

OPERA TION AND MAINTENANCE
Operators must be familiar with all sections of this manual to
understand the operation of the unit.
Hot water, steam and electricity can be hazardous.
LUBRICATION
The only pump bearing requiring lubrication is the ball bearing
in the motor support just below the flexible coupling. It has a
reservoir, which is filled with moisture resistant high tempera-
ture grease.
Remove pipe plug in motor support and add approximately 3
ounces of Shell Alvania RL 2 grease (or equivalent) from once
a year (normal) to twice a year for extremely hot conditions. Do
not use ordinary grease.
NOTICE / AUTO RESTART
Single phase motors will restart automatically after thermal
overload protector trips.
Overload thermal relays in starters must be reset manually.
A properly installed unit should function unattended for long
periods of time. Periodic checks to assure proper operation
are highly recommended. Refer to trouble shooting section
when necessary.
A variety of control options are available and are furnished in
accordance with user specifications. Refer to wiring diagrams
(when furnished) to determine control switch settings.
The inlet strainer (when furnished) in intended to protect the
pump and system. Periodic cleaning should be included in the
maintenance schedule. Check frequently in new systems.
GAGE GLASS MAINTENANCE (Vented Systems)
Clean gage glass as required using commercial glass cleaner.
Dilute muratic acid may be used if required (observe handling
precautions). Never clean gage glass with wire brushes,
scrapers or harsh abrasives.
Do not reuse gage glass or packings or seals.
Immediately replace glass which is broken, cracked, chipped,
scratched or otherwise damaged. Inspect periodically with a
bright concentrated light. Anything which glistens and catches
the fingernail or any star-shaped or crescent-shaped mark
which glistens is cause for replacement. Any gage glass which
appears cloudy or roughened and will not respond to cleaning
procedures should be replaced.
When replacing gage glass, use new packings specified for
this use. Install glass with sufficient end clearance for expan-
sion (keep glass to metal clearance at each end) and tighten
nuts just enough to avoid leakage (do not over tighten).
Condensate enters the screen from the bottom and flows out-
ward from the inside. Foreign matter intercepted by the screen
may drop into the large dirt pocket in the lower portion of the
strainer body; however, grease, oil, gasket material and other
foreign substances present in all heating systems are likely to
stick and clog the strainer screen. For this reason it may be
necessary to clean the strainer several times a week during
the first few months of operation.
To clean strainer proceed as follows: (1) open disconnect
switch(es), (2) close return line gate valve, (3) remove drain
plug, (4) remove cap screws, cover and screen, (5) clean
screen thoroughly, (6) flush strainer body and dirt pocket, (7)
inspect gasket, (8) reassemble.
While the pump is shut down inspect and clean the multi-jet
nozzles as follows: (1) drain receiver below nozzle level by
removing drain plug, (2) remove discharge manifold cover
plate and multi-jet nozzle, (3) clean nozzle, (4) inspect gasket
and reassemble, (5) reprime pump to half way level in gauge
glass, (6) close switches, (7) open return line gate valve slowly.
INLET BASKET STRAINER MAINTENANCE
WARNING: HIGH VOLTAGE
Disconnect and lock out power before connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.
CAUTION: SUBSEQUENT DAMAGE
A unit showing symptoms of possible problems
(overflow, noise, leaks, vibrations, continual operation, etc.)
must be corrected immediately. Failure to follow these
instructions may result in full liability for subsequent injury
or property damage.
SAFETY INSTRUCTIONS
SEE COVER OF THIS MANUAL
WARNING: EXPLOSIBLE
Do not pressurize receiver. Isolate receiver during
leak test. Do not plug overflow. Do not restrict vent opening
to atmosphere. Open valves slowly. Failure to follow these
instructions could result in serious injury or death.
6
VACUUM GAUGE TAPPING
VACUUM BREAKER TAPPING
CAPSCREWS
COVER
GASKET
SCREEN
STRAINER BODY
DRAIN PLUG (ON REAR OF STRAINER)
THERMOMETER (ON FRONT OF STRAINER)
FIG. 11
5
SPECIAL PIPING ARRANGEMENTS FOR LOW RETURNS
(IF LIFT EXCEEDS 5 FEET, A MECHANICAL LIFT IS RECOMMENDED)
FIG. 5
FIG. 7
FIG. 6
FIG. 9
FIG. 10
FIG. 8