Install Instructions

PUMP INSTALLATION
Locate the pump so there is sufficient room for inspection,
maintenance and service. Bell & Gossett recommends the
installation of service valves on the suction and discharge of
all circulators to facilitate servicing or replacement of the
circulator without draining the system.
Install suction and discharge flanges or union connectors on
the pipe ends. The use of PTFE tape sealer or a high quality
thread sealant is recommended.
Be sure to minimize any pipe-strain on the pump. Support the
suction and discharge piping by the use of pipe hangers near
the pump. Line up the vertical and horizontal piping so that the
bolt-holes in the pump flanges match the bolt-holes in the
pipe flanges. If union connections are used, line up the pump
threads with union tail pieces. DO NOT ATTEMPT TO SPRING
THE SUCTION OR DISCHARGE LINES IN POSITION. THIS
MAY RESULT IN UNWANTED STRESS IN THE PUMP BODY,
FLANGE CONNECTIONS AND PIPING. The code for Pressure
Piping (ANSI B31.1) lists many types of supports available for
various applications.
Bell & Gossett flange/union gaskets must be installed between the
NRF/NBF/SSF pump body flanges and the suction and discharge
pipe flanges/union tail pieces. Use
7
/16" diameter x 1
1
/2" long cap
screw and matching nut to connect the pump to the flanges.
Apply torque in even increments to both flange bolts until a
value of 115 in-lbs. is reached. Both the suction and discharge
flange bolts must be torqued in this manner.
If your NBF pump is equipped with a sweat connected pump
body, see the following instructions:
1. Use a torch with a sharp pointed flame.
2. Clean tube ends and pump connections thoroughly.
3. Use 95-5 (Tin-Antimony); and a good grade of flux.
4. When sweating the joints, first wrap the pump body with a
cool wet rag, then direct the flame with care to avoid
subjecting the pump to excessive heat.
5. Check soldered connections for leaks. If resoldering is
required, take care to avoid subjecting the pump to exces-
sive heat.
MODE OF DISCHARGE
The Model NRF/NBF/SSF Circulator can be installed to dis-
charge up or down, horizontally, left or right, but the motor
shaft must remain in the horizontal position, the arrow on the
body must point in the direction of the flow, the conduit box
must be positioned on the top or to the side of the motor
housing (see figure 2). If the conduit box position must be
changed, it is best to do so before installation. However, if the
pump is already installed, see the section titled “REMOVAL OF
PUMP FROM EXISTING SYSTEM FOR REPLACEMENT”
before proceeding.
TO CHANGE THE CONDUIT POSITION
1. Remove the four (4)
1
/4-20 Allen screws (
3
/16 wrench) while
supporting the motor assembly.
2. Remove the motor assembly from the pump body and
rotate it to the desired position (see figure 2).
3. Replace the Allen screws and tighten evenly in a diagonal
method to 60 in-lbs.
4. Check to see that the impeller turns freely. Insert your finger
in the discharge port of the pump body (the arrow on the
pump body points in the direction of the discharge) until
you can feel the impeller and rotate it with your fingertip. If
the impeller does not turn easily, repeat the disassembly/
reassembly process.
FIG. 2
CAUTION:
Heat associated with the use of silver solder may
damage a pump voiding the warranty. Do not use silver
solder. Failure to follow these instructions could result in
property damage and/or moderate personal injury.
CAUTION:
Excessive use of solder in a vertical installation may
result in damage to the pump impeller. Do not use
excessive flux. Failure to follow these instructions could
result in property damage and/or moderate personal injury.
3
WARNING: HOT WATER HAZARD
When disassembling a gasketed joint, always use a
new gasket upon reassembly. NEVER RE-USE OLD
GASKETS. Failure to follow these instructions could result
in serious personal injury, death and/or property damage.
WARNING: WATER LEAKAGE HAZARD
To prevent leakage, make certain that the flange bolts
or ring nuts have been adequately tightened and that the
solder connections do not leak. Failure to follow these
instructions could result in serious personal injury, death
and/or property damage.
CAUTION: The use of PTFE impregnated pipe
compound and PTFE tape on pipe threads pro-
vides lubricity which can lead to overtightening and break-
age. Do not overtighten. Failure to follow this instruction
can result in moderate personal injury from hot water
and/or property damage.
CAUTION:
Make sure the power is turned off before placing
anything inside the discharge opening to move the impeller.
WARNING: HOT WATER HAZARD
Make sure that each flange gasket remains seated in
the flange groove during and after installation. Failure to
follow these instructions could result in serious personal
injury, death and/or property damage.