7
Fitting the thermostat to the wall plate
Ensure the terminal guard is fitted into place
over the terminals of the wall plate. Fit the two
AAA batteries provided, ensuring they are installed
correctly as indicated by the terminal markings in
the battery compartment. Ensure that the electricity
supply to the HRT4-B is switched OFF.
Swing the thermostat into position on the wall plate
without fitting the battery terminal guard. Tighten the
2 captive screws on the underside of the unit.
Now switch ON the electrical circuit to the HRT4-B
and observe that it switches the heating system On
and Off as the temperature is turned up and down
on the thermostat. If the thermostat is switching
the heating system satisfactorily then switch the
electricity supply to the thermostat OFF, remove the
thermostat from the wall plate and fit the terminal
guard over the terminals on the wall plate.
Once clipped into position the terminal guard cannot be removed from the wall plate.
Re-fit the thermostat into position on the wall plate and tighten the 2 captive screws on the
underside of the unit. Switch on the electricity supply to the HRT4-B and check again for correct
operation.
Explain its operation to the householder before handing over these instructions, highlighting the
‘explanation for householders’ section on page 2.
Wiring conversion charts
Replacing existing Horstmann thermostats
Replacing other thermostats
HRT4-B DRT1
Common 1 Common
Call (N/O) 4 N/O
Satisfied (N/C) 3 N/C
HRT4-B Drayton Danfoss Honeywell
Digistat + RETB DT90E
Common 1 Com 3 A
Call (N/O) 4 On 2 B
Satisfied(N/C) 3 Off 1 C
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