ESP Varimax 20 ASHP Installation And Operation Manual page 16

 The control wire must be passed through the
protective wire aperture in the unit casing and
plugged into the controller socket.

The power supply must go through the
protective wire aperture in the unit casing and
be connected securely to the terminals in the
control box. There is an alternate access
grommet in the casing near to the drain-off point.
 In section 13 you will find wiring diagrams for the. Please refer to 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.
 If the Building Regulations in your area require a 7-day programmer,
please note that the most efficient way of running an ASHP heating
system is to set the programmer to ALWAYS ON. A programmerthat
meet current building regulations 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 45&46
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 1.0
Controller
Mains power
Connector
Connector Block
PASRW060-D-BP