Bell & Gossett DN0135D User Manual

Domestic® Pump

WARNING

Vacuum Heating

INSTRUCTION MANUAL

DN0135

REVISION D

Units Series VL

™

INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.

SAFETY

INSTRUCTIONS

This safety alert symbol will be used in this manual and on

the unit safety instruction decals to draw attention to safety
related instructions. When used, the safety alert symbol means
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT
IN A SAFETY HAZARD.

SERIES VL UNIT

25,000 – 60,000 EDR

If the decals as noted below are missing or are illegible contact

your local B&G representative for a replacement.

1. Electrical connections to be made by qualified Electrician in
accordance with all National, State and Local codes.

2. Motor must have properly sized starter with properly sized
heaters to provide overload and undervoltage protection.

3. If pump, motor or piping are operating at extremely high or
low temperatures, guarding or insulation is required.

4. Operating personnel should be trained in the operation of
pumps and associated systems (condensate, boiler feed, etc.).

EXPLOSIBLE

(2) All Units

DN0483 (Small) - DN0484 (Large)

DO NOT PRESSURIZE TANK.
ISOLATE TANK DURING LEAK TEST.
DO NOT RESTRICT VENT.
DO NOT PLUG OVERFLOW.
OPEN INLET VALVES SLOWLY.
DO NOT USE AS A FLASH TANK.

FAILURE TO FOLLOW
INSTRUCTIONS COULD RESULT
IN SERIOUS INJURY OR DEATH.

WARNING

EXPLOSIBLE

ISOLATE TANK

DURING LEAK TEST

(2) All Units
DN0485 (Small)
DN0486 (Large)

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

DN0116 Units with Panel

TM

Morton Grove, Illinois 60053

CAUTION

DO NOT RUN PUMP DRY,
SEAL DAMAGE MAY OCCUR.

INSPECT PUMP SEAL
REGULARLY FOR LEAKS,
REPLACE AS REQUIRED.

FOR LUBRICATION
REQUIREMENTS, CONSULT
SERVICE INSTRUCTIONS.

FAILURE TO FOLLOW
INSTRUCTIONS COULD
RESULT IN INJURY OR
PROPERTY DAMAGE.

P70644 All Units

P70644

2

DESCRIPTION AND INSTALLATION

The Series VL vacuum heating units are designed to serve the

dual purpose of pumping accumulated condensate back to the
boiler feed tank and maintaining vacuum in the condensate
system. This vacuum will draw air out of the system on start-up
and facilitate the flow of steam thru the heating system.

One pump/vacuum producer/discharge valve assembly
controls both the condensate discharge and the production of
vacuum. Two pump (duplex) units have a second assembly for
backup and to provide extra capacity to handle peak loads.

Various electrical controls are offered to meet system require­ments. These controls are normally supplied as part of the
assembled unit and a wiring diagram is furnished with the unit.
Refer to this electrical diagram as required.

The units respond to both changing condensate levels and
system vacuum requirements.

In operation the centrifugal pump circulates water (condensate)
thru the multi-jet nozzle creating multiple jets of water entering
the venturi. These jets entrain air and gasses creating a smooth
steady vacuum in the nozzle body and in the condensate
system. The air and gasses are separated in the receiver and
vented to atmosphere.

Low system vacuum or high water in the receiver will start the
pump to create vacuum and circulate water.

The solenoid operated discharge valve is opened in response
to the condensate level float switch. Controlled opening of the
discharge valve holds sufficient back pressure in the nozzle
body that the vacuum producer continues to function even
when discharging condensate (simultaneous rating).

When the vacuum and float switches have been satisfied and
the pump stops, the check valve in the nozzle body closes,
preventing the return of air and water to the system.

An internal orifice permits the vacuum in the receiver and in the
system to slowly equalize. Note that the vent line on the Series
VL requires a check valve to prevent return of atmospheric air
to the receiver. Without the check valve and orifice, a system
could develop high vacuum upon cooling holding the check
valve closed and thereby preventing flow of condensate into
the unit.

STRAINER

CONTROL PANEL

VENTURI

AIR VENT VALVE

FLOAT SWITCH

RECEIVER

MOUNTING PADS FOR DUPLEX
CENTRIFUGAL PUMPS

CENTRIFUGAL PUMP

MULTI-JET NOZZLE

DISCHARGE
MANIFOLD

SOLENOID
DISCHARGE VALVE

DISCHARGE

CHECK VALVE

VACUUM GAGE

DSK-1330

FIG. 1 SERIES VL VACUUM UNITS 25,000-60,000 EDR

FIG. 2 SERIES VL VACUUM PRODUCER

AIR VENT

RECEIVER

INLET

MULTI-JET NOZZLES
VENTURI

NOZZLE

BODY

CENTRIFUGAL PUMP

DSK-1328

SOLENOID

DISCHARGE

VALVE

BOILER

TO
DRAIN

FROM BOILER
FEED SYSTEM

TO DRAIN

INLET
STRAINER

RETURN FROM
HEATING
SYSTEM

EQUALIZING LINE –

3

/4"

OPEN VENT ABOVE
BOILER WATER LINE

AIR VENT

DISCHARGE
VALVES

PRIMING
OPENING

TO DRAIN

CENTRIFUGAL PUMPS

– CHECK VALVE
– GATE VALVE
– STEAM OR PLUG COCK
– UNION

TO BOILER
FEED SYSTEM

Receivers are non-code cast iron.

PRELIMINARY INSPECTION

Assure that there is no shipping damage.

Assure that nameplate ratings agree with job specifications and
actual conditions.

HANDLING

Use care in installing unit.

LOCATION

Place unit for easy access to all parts. Allow adequate space

for servicing. Check ambient conditions.

NOTICE/TEMPERATURE LIMITS

Motors are designed to operate in 104°F max. ambient.

Insulate or ventilate as required.

PIPING (General)

Pipe the unit per the Elementary Piping Diagram. Locate and

support piping so as to not load the discharge valve.

PIPING (Vent)

Install a vent pipe to atmosphere. Pipe to be size of vent port

on unit. Do not restrict or reduce vent opening or exceed 20
feet vertical height unless an overflow connection is provided.

Series VL Units require a check valve in the vent line as shown
on the piping diagram (furnished with unit).

PRIMING PORT

Provide a priming port as shown on piping diagram. Provide a

water supply for priming.

FLOAT SWITCHES

Floats are locked in place to prevent damage during shipment.

Remove shipping locks. Check factory settings. Floats are
adjustable for various levels of operation.

See page 7 for detailed instructions.

EQUALIZING LINE

An equalizing line must be installed with all Series VL units. This

line must be installed to prevent formation of a vacuum on the
radiation side of the system when steam stops flowing in the
mains. This vacuum may be higher than return line vacuum,
which would prevent condensate from flowing back to pump.
To correct this is an unzoned system, install equalizer line as
shown in the piping diagram. To correct this in a zoned system,
install equalizer line for each zoned section or install a vacuum
breaker on supply line on radiation side of each zone control
valve.

3

CAUTION: UNIT LIFTING EYE

Use unit lifting eyes only to lift unit as shipped from

factory. Unit must be empty and disconnected from pipes,
anchors and other restraints. Use proper rigging pro­cedures. Failure to follow these instructions could result in
injury or property damage.

CAUTION: NOT A CHEMICAL PUMP

Inject boiler feed compounds from chemical feed tank

into boiler feed piping – never into condensate tank. Failure
to follow these instructions could result in injury or property
damage.

EQUALIZING CONNECTIONS FOR ZONED SYSTEMS

ZONE CONTROL

VALVE

STEAM MAIN

M

TO ZONE

RETURN MAIN

FIG. 3. SERIES VL PIPING DIAGRAM

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.