Xylem P81547D Series 90 In-Line Centrifugal Pump - Manual (Page 15)

Special installation
Installation with suction diffuser and triple-duty valve
Do not install and operate triple-duty valves and suction diffusers in closed systems unless
the system is designed with these safety and control devices:
• Pressure relief valves
• Compression tanks
• Pressure controlling equipment
• Temperature controlling equipment
• Flow controlling equipment
Check that the control and safety devices have these characteristics:
• Properly sized for their purpose
• Placed correctly in the system before putting the system into operation
Connect the wiring
WARNING:
• Disconnect and lock out electrical power before installing or servicing the pump.
• Motors without built-in protection must be provided with contactors and thermal
overload protection for single-phase motors, or starters with heaters for three-phase
motors. (See the nameplate on the drive unit to select properly-sized overloads.)
Electrical Hazard:
Make sure that all connections are secure and the conduit box cover is closed before you
connect the electrical power.
1. Remove the screws that secure the conduit box cover.
2. Lift off the cover.
3. Attach the appropriately sized connector to the hole in the side of the conduit box.
The circulators are thermally protected by impedance or on-winding thermal protectors
and do not require external overload protection.
Installation
14 Series 90 Installation, Operation, and Maintenance Manual