Install Instructions

ITT
8200 N. Austin Avenue
Morton Grove, IL 60053
Phone: [phone]
Fax: [phone]
www.bellgossett.com
© COPYRIGHT 2008 BY
ITT CORPORATION
PRINTED IN CHINA 2-08
THE ITT ENGINEERED BLOCKS SYMBOL AND
ENGINEERED FOR LIFE ARE REGISTERED
TRADEMARKS OF ITT CORPORATION
CHECK VALVE INSTALLATION
The NRF/NBF-25 pump discharge nozzle is machined to
accept check valve P/N P86596. If a check valve is required
for the installation, insert the O-ring end of P86596 into the
discharge port of the pump body and hand press the check
valve body into place until it snaps in position.
SYSTEM PREPARATION
Prior to pump start-up, closed heating and cooling systems
should be cleaned, drained, and refilled with clean water. The
system fluid pH must be maintained between 7 and 9.
START-UP
Do not start pump until the system has been filled and vented.
Air should be vented from the system by means of an air vent
located at a high point in the system. The system must be
completely vented prior to pump operation. Do not run NRF/
NBF circulators dry. Pump operation without water circulation
could result in pump and motor damage.
PERIODIC INSPECTION
Bell & Gossett NRF/NBF Circulators are designed to provide
years of trouble free service. It is recommended that periodic
inspections be made to check for potential problems with the
pump. If any leakage or evidence of leakage is present, repair
or replace the unit.
WARNING: HOT WATER LEAKAGE HAZARD
Pressurize the body slowly while checking for leaks at
all joints with gaskets or solder connections. Failure to follow
these instructions could result in serious personal injury
and/or property damage.
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0102030405060
510
0123
40
30
20
10
0
(gpm)
(m3/hr)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-36
SPEED 1
SPEED 3
SPEED 2
SPEED 1
100
(kPa) (M) (FT)
50
0
10
5
0
0
0102030405060
510
0123
40
30
20
10
0
(gpm)
(m3/hr)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-45
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 1020 30405060
510
0123
40
30
20
10
0
(gpm)
(m3/hr
)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-25 WITH CHECK VALVE
SPEED 1
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 1020 30405060
510
0123
40
30
20
10
0
(gpm)
(m3/hr
)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-25 WITHOUT CHECK VALVE
SPEED 1
SPEED 3
SPEED 2