Bell & Gossett DN0129D Series CMU - Manual (Page 2)

2
DESCRIPTION
Series CU condensate units have one (simplex) or two (duplex)
pumps which are controlled by a float(s) switch or mechanical
alternator switch in the receiver.
These pumps return accumulated condensate to the boiler
feed system.
Series CMU boiler feed units have one (simplex) or two (duplex)
pumps which are controlled by boiler system controllers. Series
CMU receivers are sized to provide for accumulating system
surges of condensate. Water makeup valves are also included
to insure that water is always available to meet boiler demands.
Receivers are non-code cast iron.
PRELIMINAR Y INSPECTION
Assur e that there is no shipping damage.
Assure that nameplate ratings agree with job specifications and
actual conditions.
HANDLING
Use car e in installing unit.
LOCA TION
Place unit for easy access to all parts. Allow adequate space
for servicing. Check ambient conditions.
NOTICE / TEMPERA TURE LIMITS
Motors ar e designed to operate in 104ºF (40°C) max. ambient.
Insulate or ventilate as required.
PIPING (General)
Pipe the unit per the Elementary Piping Diagram. Locate and
support piping so as not to load the pump discharge.
PIPING (Retur ns)
Gravity r eturn lines from the system must be properly pitched
down to unit inlet. Returns must also be trapped to pre-
vent steam entry into the unit. An inlet basket strainer is
recommended.
PIPING (V ent)
Install a vent pipe to atmospher e. 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.
FLOA T SWITCHES AND MECHANICAL ALTERNATORS
The floats which operate these swithces ar e factory set but can
be field readjusted as required.
Adjustment is made by removing the float switch as an assem-
bly and readjusting the stop collars on the float rod.
Setting should utilize as much of the tank volume as practical.
Settings should avoid “short cycling” of the pump. See page 3
for detailed instructions.
ELECTRICAL WIRING & CONTROLS
Connect power wiring per NEC. Rechceck nameplate vs. spec -
ifications and conditions. All single phase motors have internal
thermal protection.
Three phase motors must use starters with properly sized over-
load relays. Overload relays furnished are designed for manual
reset.
AIR VENT
TO DRAIN
UNION
CHECK VALVE GATE VALVE
STEAM COCK
DISCHARGE
CONDENSATE
RETURN LINE
UNDERGROUND
CONDENSATE
RETURN LINE
BASKET
STRAINER
(OPTIONAL)
UNION
TO DRAIN
IDPD33
AIR VENT
TO DRAIN
WATER LINE
OF BOILER
UNION
CHECK VALVE GATE VALVE
STEAM COCK
WATER MAKE-UP
WITH 3 VALVE BYPASS
OPTIONAL
DISCHARGE TO BOILER
DETAIL AA
WATER
MAKE-UP
SUPPLY
(SEE DETAIL AA)
CONDENSATE
RETURN LINE
UNDERGROUND
CONDENSATE
RETURN LINE
BASKET
STRAINER
UNION
TO DRAIN
IDPD44
SERIES CU – CONDENSATE UNIT SERIES CMU BOILER FEED UNIT
REPRESENTATIVE PIPING DIAGRAMS
WARNING: 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.
CAUTION: NOT A CHEMICAL PUMP
Inject boiler feed compounds fr om chemical feed tank
into boiler feed piping – never into condensate tank. Failure
to follow these instructions could result in injury or property
damage.
W ARNING: HIGH VOLTAGE ELECTRICITY
Disconnect and lock out power befor e connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.