ESP Varimax I ASHP Installation And Operation Manual page 17

 In section 13 you will find wiring diagrams for the unit and, in
section 16, instruction on how to connect a remote controller to
the rear of the Carel controller. Please use these diagrams when
introducing power or other wiring into the unit. You should also
use these diagrams to check the installation through before
starting the unit for the first time.
 Part L2 of The Building Regulations requires that the heating
system be fitted with a 7 day programmer. However, the most
efficient way of running an ASHP heat system is to set the
programmer to ALWAYS ON. An L2 compliant programmer may
be used but it is very IMPORTANT that any signal going back to
the heat pump from the heating system thermostat and/or
programmer must be VOLT FREE ! The heating system
thermostat/ programmer controller is wired to terminals 24&25
inside the heat pump (these connections are not polarized) If
you do not use a volt free programmer you WILL damage the
ASHP unit.
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V 1.7
Mains power
Connector Block
Mains power
Connector Cover
Terminals 24/25
PASRW040-D-BP