Maintenance
Periodic inspection
• It is recommended that periodic inspections be made to check for potential problems
with the pump.
• If any leaks or evidence of leakage is present, repair or replace the unit.
Remove the pump from an existing system
WARNING:
• Make sure that the pump is isolated from the system and that pressure is relieved before
you disassemble the pump, remove plugs, open vent or drain valves, or disconnect the
piping.
• Always disconnect and lock out power to the driver before you perform any installation
or maintenance tasks. Failure to disconnect and lock out driver power will result in
serious physical injury.
• Burn hazard. Do NOT re-use old gaskets. When disassembling a gasketed joint, always
use a new gasket upon reassembly.
1. Close the valves on the suction and discharge sides of the pump.
If no valves are installed, you might need to drain the system.
2. Drain the system:
WARNING:
Allow all system and pump components to cool before you handle
them to prevent physical injury.
a) Allow the water to cool to at least 100°F (38°C).
b) Take precautions against water damage, and then open the drain valve.
c) Leave the drain valve open until servicing is complete.
Electrical Hazard:
Make sure the electrical power is not present at the motor leads before
continuing.
3. Loosen the screws on the conduit box and remove the cover.
4. Disconnect the electrical supply lines to the pump.
5. Relieve pressure in the pump body.
WARNING:
Pressurized device. Relieve any contained pressure in the pump body
by loosening the flange bolts and shifting the pump assembly slightly
to allow the pressurized water to escape.
6. Remove the flange nuts and bolts or loosen the union ring nuts. Then remove the
pump from the piping
Maintenance
16
NRF
™
-25,36,45/NBF
™
-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
