16 ©ESP Ltd. Sept 2008
4.Installation
4. Installation
Great care should be taken to ensure that the unit is properly wired to the
mains electricity and any auxiliary components.
The mains wire connection will be found towards the bottom of the unit. The
power supply MUST be switched.
The 2-port motorised valve MUST be wired in series with the Indirect controls
(for the unit Indirect Thermostat and Thermal Cut-Out) such that the power
supply to the valve is interrupted should either the Thermostat or Thermal Cut-
Out operate. Wiring to external controls is made via the terminal block fitted.
The cable should be routed through the aperture in the terminal cover and se-
cured using cable grips. The Indirect Thermal Cut-out MUST NOT be by-
passed.
4.15 UNIT/SYSTEM CONTROLS
The controls either supplied with the unit or to be purchased from reputable
suppliers, must be properly installed to ensure the safe operation of the unit.
Other controls/zone valves will be necessary to control solar (or other) auxil-
iary requirements.
4.16 IMMERSION HEATER(S)
The unit is supplied with an immersion heater which can be used as an alter-
native and/or complementary heat source to raise the temperature of the wa-
ter in the unit to above 60°C once a week to remove any risk from legionella
bacteria. The immersion heater is located in the side of the unit
Hot water air source heat pump
Hot water air source heat pump
