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Good looking and reliable, this Horstmann room thermostat is suitable for all mains operated central heating systems
that respond to an electrical on/off signal.
A bimetallic sensor ensures excellent response to temperature changes and the simple rotating dial allows setting
between 5°C and 35°C.
Should be mounted directly onto the wall using built in patress (see pic.1). It should be located in a regularly heated
area about 1,5m above floor level. It should not be exposed to draughts, and should be away from internal heat
sources and direct sunlight.
N
LOAD (HEAT)
DO NOT USE
L (LINE)
To remove the knob
Turn the knob to the maximum temperature position (35°).
Insert the blade of a screwdriver in the fissure between
the knob and the top cover.
Use the screwdriver as lever to remove the knob (see pic.2).
To remove the top cover.
Remove the cover retaining screw situated behind the control knob.
Then press lightly with a screwdriver on the fixing hooks either
side and remove cover (see pic.3).
Specification
SPST contacts
Switching Capacity 10 amps (resistive) at 230V AC
Switching Differential: Approx 0.5°C
Enclosure protection: IP20
E-mail : sales@horstmann.co.uk
Website: www.horstmann.co.uk
HORSTMANN
Model HRT3 Room Thermostat
Features
Installation Instructions
top cover screws
base
screw
knob
Wiring Instructions
Room thermostat key:
L
= Mains/Live supply
Load
= Call for heat
N
= Neutral
Type of disconnection: micro - disconnection
Group of insulation: IIIa
Overvoltage: II 1500 V
Duration of electric stress for insulation parts: long period
Number of cycles: 200.000
Horstmann Controls Limited
Bristol
BS4 1UP
t:0117 9788 773 - f:0117 9788 701
wall
61
60
pic.1
Important:
To ensure correct operation of this
thermostat it is essential that terminal
4 is connected to neutral.
Failure to provide this connection will
result in incorrect and random switching.
pilot lamp
screwdriver
screw
NOTES
screwdriver
fissure for screwdriver
pic.2
screwdriver
fixing hook
pic.3
92L01 -ED.2
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