Bell & Gossett DN0134D User Manual

Domestic® Pump

WARNING

Vacuum Heating Units

INSTRUCTION MANUAL

DN0134

REVISION D

Series VLR

™

SERIES VLR UNITS

1,000 – 20,000 SQ. FT. EDR

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.

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

EXPLOSIBLE

(2) All Units

DN0483 (Small) - DN0484 (Large)

DO NOT USE AS A FLASH TANK.

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

EXPLOSIBLE

DURING LEAK TEST

DN0485 (Small)
DN0486 (Large)

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
vacuum/condensate return units.

TM

WARNING

ISOLATE TANK

(2) All Units

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 VLR 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. The Series VLR units feature a
low inlet height and therefore have a second float (in lower
compartment). As condensate accumulates in the lower com­partment, this float starts the pump and siphons the conden­sate to the upper chamber.

In operation the centrifugal pump circulates condensate from
the upper compartment 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 lift manifold
and in the condensate system. The air and gasses are sepa­rated in the upper compartment and vented to atmosphere.
See Figure 1.

Low system vacuum or high water in the upper compartment
or high water in the lower compartment will start the pump to
create vacuum and transfer water to the upper tank. High water
level in the upper compartment will also cause the discharge
valve to open.

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

The solenoid operated discharge valve is opened in response
to the condensate level float switch in the upper compartment.
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 ratings).

NOZZLE BODY

MULTI-JET NOZZLE

VENTURI

PUMP SUCTION

SOLENOID OPERATED
DISCHARGE VALVE

DISCHARGE

LIFT MANIFOLD

CHECK VALVE

CENTRIFUGAL PUMP

LOWER COMPARTMENT FLOAT SWITCH

UPPER COMPARTMENT FLOAT SWITCH

STRAINER

LOW INLET

VACUUM GAUGE

VACUUM BREAKER

VACUUM SWITCH

AIR VENT

OPERATION IS SIMPLE, EFFECTIVE AND RELIABLE

FIG. 1 CUT-AWAY VIEW OF SINGLE SERIES VLR SINGLE UNIT: TYPICAL OF ALL SINGLE AND DUPLEX MODELS

FIG. 2 SERIES VLR VACUUM PRODUCER

AIR VENT

RECEIVER

INLET

MULTI-JET NOZZLES
VENTURI

NOZZLE

BODY

CENTRIFUGAL PUMP

DSK-1328

SOLENOID

DISCHARGE

VALVE

TO BOILER
FEED
SYSTEM

REDUCER

STRAINER

SERIES VLR DUPLEX

PIPING DIAGRAM

DRAIN

DRAIN

DRAIN

DV

PRIMING

OPENING

EQUALIZING LINE —

3

/4"

BOILER

FROM BOILER
FEED SYSTEM

— GATE VALVE

— DISCHARGE VALVE

DV

— STEAM OR PLUG COCK
— UNION

— CHECK VALVE

OPEN VENT ABOVE
BOILER WATER LINE

RETURN FROM
HEATING 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
inch vertical height unless an overflow connection is provided.

PRIMING PORT

Provide a priming port as shown on piping diagram.

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 VLR 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 in 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.

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.

FIG. 4