Three Phase Power Supplies - Kensa Group Kensa Heat Pumps P250X Manual

Controller
Compressor
MCBs
Wiring Terminals
Cables should enter the unit from below using the cable entry ports provided. An external isolation switch
should be wired into the circuit to provide local isolation of the electrical supply as required.
The following sections detail the standard wiring connections. The heat pump should be set up in con-
junction with the BMS on commissioning.
In all wiring diagrams the terminals marked 'Reverse Cycle' change the mode from heating to cooling (If
this option is fitted). This requires a volt free relay, open is heating mode, closed cooling.
The terminals marked 'Fault' are to provide remote indication that a fault has occurred within the heat
pump. This is a volt free relay and the internal relay will close if a fault occurs.

4.6.1 Three phase power supplies

Heat Pump Enable Signal
No Call 0-50V
Call >120V
50V < Call voltages < 120V are not permitted
Fig 10 Heat pump wiring—Three phase power supplies
Plant Room Heat Pump Manual Version 11.1
Page 16 of 34
Enable Signal connection is supplied with a temporary link across it . This
should be removed after commissioning and connection to the heating
control system. (Terminals 1 and 2)
Volt Free relay
L 230V, LR 230V
Fig 9 Electrics box with the
front removed
Ground pump
relay
Controller 4mA
MCB
Volt Free relay
24V AC