Horstmann HRT4-B - HRT4-B thermostat - internal wiring diagram; Typical combination boiler installation for boiler with built in timer and external room stat; Typical combination boiler installation with ChannelPlus H11 XL time switch and HRT4-B room thermostat

5
HRT4-B thermostat – internal wiring diagram
• The HRT4-B has voltage free contacts.
• The HRT4-B is battery powered, therefore no
mains connection is required to power it.
Please ensure that all wiring complies with
the current IEE regulations.
The HRT4-B is double insulated and does not require an earth connection, an earth connection
block is provided on the wall plate for terminating any cable earth conductors. Earth continuity
must be maintained and all bare earth conductors must be sleeved. Ensure that no conductors
are left protruding outside the central space enclosed by the wall plate.
HRT4-B terminal connections
Typical combination boiler installation with
ChannelPlus H11XL time switch and HRT4-B room thermostat
Typical combination boiler installation for boiler
with built in timer and external room ‘stat




  


MAINS
SUPPLY









   
 







HRT4-B







MAINS
SUPPLY




These diagrams are schematic and should be used for guidance only.
1
4
HRT4-B
COMMON
   
CALL FOR
HEAT