Bell & Gossett DN0136C Domestic Pump Vacuum Heating Units Series VCL - Manual (Page 7)

FLOA T SWITCH SETTINGS
Float switches and mechanical alter nators are factory adjusted and
tested for proper operation. Shipping brackets on these switches
are used to preserve these adjustments while pump is in transit.
Remove these brackets before putting pump into operation. If
adjustments are disturbed for any reason they can be correctly
reset as follows:
ADJUSTMENT OF FLOA T SWITCHES
IN CONDENSATE RECEIVER
1. Close inlet gate valve and operate water pump on “Hand” to
remove water to the low level dimensioned.
2. Adjust cut-off point of float switch F1 so that switch opens at
low level shown. Both switches of duplex units should open
at same low level (See switch manufacturer’s instructions).
Set selector switches to OFF.
3a. (One float switch in condensate receiver). Fill lower compart-
ment thru strainer. Remove drain plug from strainer. When
water stops flowing from drain opening, adjust cut-in point of
float switch by depressing float arm slightly and setting
adjusting strip so that switch turns on when float arm is released.
3b. (Two float switches in condensate receiver). Adjust the F1 or
lead float switch as described in 3a. Adjust cut-in point of
second or stand-by switch F2 at a level 1" higher than F1.
ADJUSTMENT OF MECHANICAL AL TERNATOR
2. Fill lower compartment thru strainer. Remove drain plug from
strainer. When water stops flowing from drain opening, set
upper adjusting strip by depressing float arm with operating
level so that both sets of contacts close when operating lever
is lowly released. (See switch manufacturer’s instructions).
3. Set the lower adjusting strip for minimum differential
(no lost motion of adjusting plate). Set selector switches
to AUTOMATIC. When adjustments have been properly made,
both pumps will automatically shut off at the proper level.
HURLING W ATER CONTROL FLOAT
SWITCH ON SEPARATION CHAMBER
The switch is factory adjusted and does not r equire field
settings.
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 REST ART
Single phase motors will r estart automatically after thermal over-
load 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.
Frequent starting and stopping of the pumps (short cycling) is a
symptom of system problems and will lead to premature
failure of the vacuum producer. See Trouble Shooting procedures.
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 mainte-
nance schedule. Check frequently in new systems.
GAGE GLASS MAINTENANCE (Vented Systems)
Clean gage glass as r equired 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 packing 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 finger-
nail 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 expansion (keep
glass to metal clearance at each end) and tighten nuts just enough
to avoid leakage (do not over tighten).
W ARNING: HIGH VOLTAGE
Disconnect and lock out power befor e 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 pr
oblems (over-
flow, 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
W ARNING: EXPLOSIBLE
Do not pr essurize 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.
7
FIG. 11