Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 8)

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Instruction manual Laing Electric heater circulator unit
www.lainginc.com
Electrical Connection
Notice: The electrical connection has to be performed by a licensed
electrician!
The pump must not be operated without water.
To make the electrical connections, the control box at the top of the heater
has to be opened by removing the 4 screws. A cable with a sufficient cross
section for the performance of the Electric heater circulator unit has to be
inserted through the strain relief and connected to the input terminal (see
Electrical Diagram below)
The circulator is already wired to the control box.
Power Supply
The Electric heater-circulator is designed for three different kinds of power
supply. In all cases the following information has to be taken into account:
The electronic switches integrated into the Electric heater circulator unit do
not separate the heating elements from the power supply. Therefore, a master
switch that interrupts all phases has to be installed in an accessible place,
taking into account all applicable safety codes.
As a protection for the semiconductor relays each phase has to have a fast
acting fuse.
400V N3 Electrical Diagram
230V N1 Electrical Diagram
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