42007193-003 R1
Installation Guide
for EHE0200158 Frost Thermostat
Frost Thermostat Application
Fixing holes spaced
to suit BS4662
Screws supplied
Use wall box fixing holes
or alternatives shown
Screws supplied
3. Wiring options
2. Mount the backplate to wall
1. Remove the cover from the backplate
a. Wall box mounting
b. Surface mounting
CAUTION:
Disconnect
system power supply
before removing cover.
a. Wall box wiring
b. Surface wiring
The Frost Thermostat can be installed to protect either the whole
central heating system, or the boiler and localised pipework.
If the Frost Thermostat is installed to protect the central heating
system it must be sited within the dwelling in a place where a
rise and fall in ambient air temperature can be detected i.e. in a
room with a radiator. The wiring for this is shown in the wiring
diagram overleaf.
The Frost Thermostat must be wired to override all other time
and temperature control and preferably to switch on the
heating circuit, rather than the hot water circuit.
When a Frost Thermostat is installed on a central heating
system, the Connection Unit should only be switched off for
servicing or maintenance. If the system is to be switched off
for any other reason e.g. holiday, then switching MUST only be
carried out at the programmer or time clock.
