Bell & Gossett DN0145D HS Vacuum Heating Units Series HVTM - Manual (Page 3)

3
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 HV 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 HV 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 vac-
uum, which would prevent condensate from flowing back to
the pump. To correct this in an unzoned system, install equal-
izer 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.
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 pro-
cedures. 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: 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.
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
EQUALIZING CONNECTIONS FOR ZONED SYSTEMS
ZONE CONTROL
VALVE
STEAM MAIN
M
TO ZONE
RETURN MAIN
FIG. 3
SERIES HV PIPING DIAGRAM