Commissioning, Startup, Operation,
and Shutdown
Pump operation precautions
WARNING:
• Do NOT exceed the maximum working pressure of the pump. This information is
listed on the nameplate of the pump.
• The heating of water and other fluids causes volumetric expansion. The associated
forces can cause the failure of system components and the release of high-
temperature fluids. In order to prevent this, install properly sized and located
compression tanks and pressure-relief valves. Failure to follow these instructions can
result in serious personal injury or death, or property damage.
• Make sure that all components are properly guarded or insulated when operating at
extremely high or low temperatures.
• Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local rules.
Electrical Hazard:
Do NOT install this pump in swimming pools or marine areas. Failure to follow these
instructions could result in serious personal injury, death and/or property damage.
Prepare the system
1. Clean and drain closed heating and cooling systems.
2. Refill the system with clean water.
The system fluid pH must be maintained between 7 and 9.
Start the pump
WARNING:
Pressurize the pump body slowly while you check for leaks at all gasketed joints and
solder connections.
Do not start pump until you fill and vent the system.
1. Vent air 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.
2. Make sure the pump is filled with clean water.
Do not run the pump dry. Pump operation without water circulation can result in
pump and motor damage.
Select the speed
The pump can be run at different speeds to suit the required operating conditions.
Select the speed by adjusting the three-position switch on the side of the terminal
box.
Commissioning, Startup, Operation, and Shutdown
12
NRF
™
-25,36,45/NBF
™
-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
