Bell & Gossett DN0145D HS Vacuum Heating Units Series HVTM - 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.
Check motor nameplate for any lubrication requirements.
Pumps require no lubrication.
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) is 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 System)
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).
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.
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
POSITION WHEN USED OPERATION
“Vacuum and Float” or “FL-Vac” Normal position
Pumps operate on either low
vacuum or high condensate
“Float Only” or “Float”
Sometimes used for night and week-end service. This Pump starts and stops on
setting not recommended for use with lift fitting. Condensate level change
“Continuous” or “Hand”
Testing and for unusually high
Continuous
lift conditions in return lines.
“Off” (Duplex Units only) Adjust controls, inspect pump Prevent operation of motor
SELECTOR OR V ACUUM SWITCH SETTINGS
The vacuum switches are adjusted and tested at the factory
for proper operation. The vacuum switch on a single unit and
the lead switch of a duplex unit is set to close at 3" Hg vacu-
um and open at 8". The lag switch of a duplex unit is set to
close at 2
1 / 2 " and open at 8".
These settings are suitable for all normal installations including
those having an accumulator tank or lift fitting. If settings must
be readjusted refer to manufacturer’s instructions.
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.