Bell & Gossett DN0137D User Manual

Domestic® Pump
Vacuum and Boiler Feed Units

INSTRUCTION MANUAL

DN0137

REVISION D

Series VCMD

™

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.

WARNING

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

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
boiler feed units.

WARNING

ISOLATE TANK

(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

Domestic®Series VCMD™Combination Boiler Feed
and Vacuum Units

Style CMHD-A vacuum unit mounted on horizontal steel boiler feed receiver.
Style CMHD-B vacuum unit with separate horizontal steel boiler feed receiver.
Style CMVD-A vacuum unit mounted on vertical steel boiler feed receiver.
Style CVM vacuum unit with separate cast iron boiler feed receiver.

FIG. 1 REPRESENTATIVE PIPING DIAGRAM - VCMD

Style CMHD-A with vacuum unit mounted on

horizontal steel boiler feed receiver, and returns
above receiver inlet. Refer to separate diagram
for piping between boiler feed pump(s) and
boiler(s).

FIG. 2 REPRESENTATIVE PIPING DIAGRAM - VCMD

Style CMHD-B with separate vacuum unit and

horizontal steel boiler feed receiver, returns above
receiver inlet. Refer to separate diagram for piping
between boiler feed pump(s) and boiler(s).

FIG. 3 REPRESENTATIVE PIPING DIAGRAM - VCMD

Style CVM with separate vacuum unit and cast iron

boiler feed receiver, returns above receiver inlet. Refer
to separate diagram for piping between boiler feed
pump(s) and boiler(s).

DESCRIPTION

The Series VCMD family of units consists of various combinations of

boiler feed units combined with Domestic Series MJ vacuum pro­ducers. The vacuum producer may be mounted directly on the boiler
feed unit (STyle A) or the units may be independently mounted with field
piping between the units (Style B). The boiler feed units can be con­structed with cast iron or steel receivers in many of the standard con­figurations offered as Domestic boiler feed units.

The vacuum producer acts in response to selector switch settings and
system vacuum also functions to remove excess water from the boiler
feed tank. Various controls are supplied in accordance with system
specifications and system requirements. Electrical panels are normally
supplied and specific wiring diagrams are supplied with each vacuum
producer electrical panel.

The boiler feed system functions like a standard vented boiler feed sys­tem. Again, various control options are available to match system
specifications. Electrical panels and electrical diagrams are normally
furnished.

The boiler feed units are designed to pump water into an operating
boiler. The pumps are controlled by level controls on the boiler. Low
water cut-off switches and alarms are often supplied (optional).

Receivers are non-code cast iron or steel.

PRELIMINARY INSPECTION

Assure that there is no shipping damage.

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

HANDLING

Use caring 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.

BOILER FEED SYSTEM

PIPING (General)

Pipe the unit per the Piping Diagram. Locate and support piping so as

to not load the pump discharge.

PIPING (Return)

Gravity return lines from the system must be properly pitched down to

unit inlet. Returns must also be trapped to prevent steam entry into the
unit. An inlet basket strainer is recommended.

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. The water make-up float switch should “make” at a
higher level than low water cut-off switch “breaks”.

VACUUM SYSTEM

PIPING (General)

Pipe the unit per the Piping Diagram shipped with the unit or as shown

herein. Locate and support piping so as to not load the pump discharge.

PIPING (Suction) (Style B)

Use a suction line at least as large as the unit inlet fitting. Vacuum

storage tanks will reduce system surges or short cycling and a vertical
tank can trap liquids and solids.

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.

PIPING (Overflow)

Pipe overflow port to drain.

VACUUM SWITCH ADJUSTMENTS

Vacuum switches, when furnished, are factory adjusted and tested for

the specified operating range. If settings must be readjusted, refer to
manufacturer’s instructions.

HURLING WATER MAKE-UP AND CONTROL

The hurling water level is automatically controlled by a solenoid valve

actuated by a float switch.
Connect the water make-up assemblies to city water. Use piping at

least as large as the valve piping provided. Install a manual fill valve if
not included on the unit. The vacuum producer and the boiler feed unit
have separate make-ups.

To operate at a high vacuum, the hurling water must be at a low tem­perature resulting in a low vapor pressure. Cooling water can be auto­matically admitted by using an optional temperature limit switch. This
switch actuates the solenoid valve if the temperature rises above a
preset point.

The optional condensate Temperature Limit Switch will stop normal
operation of the vacuum unit when condensate exceeds the set point
temperature (usually 160ºF). Vacuum is not normally required when the
system is up to temperature and operation of the vacuum pumps with
hot condensate results in condensate loss due to evaporation.

INTERCONNECTING PIPING

On style B units, the interconnecting piping between the boiler feed

unit and the vacuum producer must be the size of the vacuum pro­ducer inlet. The two vacuum inlets on duplex vacuum producers must
be connected to the boiler feed tank.

ELECTRICAL WIRING & CONTROLS

Connect power wiring per NEC. Recheck nameplate vs. Specifications

and conditions. All single phase motors have internal thermal
protection.

Three phase motors must be use starters with properly sized overload
relays. Overload relays furnished are designed for manual reset.

EQUALIZING LINE

A vacuum may be formed on radiation side of system when steam

stops flowing in 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
Figures 1 thru 3. To correct this in a zoned system, also install equali­zer line for each zoned section or install a vacuum breaker on supply
line on radiation side of each zone valve.

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.

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.

WARNING: HIGH VOLTAGE ELECTRICITY

Disconnect and lock out power before connecting or servic-

ing unit. Failure to follow these instructions could result in injury or
property damage.

FIG. 4 EQUALIZING CONNECTIONS FOR ZONED SYSTEMS

ZONE CONTROL

VALVE

STEAM MAIN

M

TO ZONE

RETURN MAIN