Hrt4-B Thermostat–Internal Wiring Diagram; Typical Combination Boiler Installation; Hrt4-B Terminal Connections - Horstmann HRT4-B User And Installation Instructions Manual

HRT4-B thermostat – internal wiring diagram
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
COMMON
1
MAINS
SUPPLY
ChannelPlus H11XL time switch and HRT4-B room thermostat
MAINS
SUPPLY
For precise terminal
connection information
please refer to boiler
manufacturer's instructions
These diagrams are schematic and should be used for guidance only.
2 3 4
CALL FOR
HEAT
Typical combination boiler installation for boiler
with built in timer and external room 'stat

HRT4-B terminal connections

E
N
L
E N L
COMbINaTION bOILER TERMINaLs
Typical combination boiler installation with
N L
E
N
L
E N L
COMbINaTION bOILER TERMINaLs
• 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.
1 2 3 4
REMOVE LINK
IF FITTED
1 2 3 4 5
1
HRT4-B
ROOM
sTaT
4
6
H11XL terminals
TERMINaLs L-5
sHOULD NOT
bE LINKED
REMOVE
LINK IF
FITTED
5