Installation
Pump location guidelines
Guideline
Explanation/comment
Make sure that the space
around the pump is sufficient.
This facilitates ventilation, inspection, maintenance, and service. Xylem
recommends that the service valves on the suction and discharge of all circulators
are installed so they can be serviced or replaced without draining the system.
Pump orientation
You can install this pump to discharge up, down, left, or right. However, make sure that
you install the pump according to these pump orientation guidelines:
• Only install the pump with the motor shaft horizontal.
• The arrow on the pump body must point in the direction of the flow.
• You must position the conduit box on the top or to the side of the motor housing. If
you need to change the position of the conduit box, change it before you start the
installation. If the pump is already installed, see
Remove the pump from an existing
(page 15) before proceeding.
Change the conduit position
CAUTION:
Burn or projectile hazard. Make sure the power is turned off before placing anything
inside the discharge opening to move the impeller.
Figure 1: Conduit box position
1. While supporting the motor assembly, use a 3/16 wrench in order to remove the four
1/4-20 Allen screws.
2. Remove the motor assembly from the pump body and rotate it to the desired
position.
3. Replace the Allen screws and tighten them 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 until you can feel the impeller and rotate it with your fingertip.
The arrow on the pump body points in the direction of the discharge. If the impeller
does not turn easily, repeat the disassembly/ reassembly process.
Installation
8
NRF
™
-25,36,45/NBF
™
-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
