Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual page 13

Figure 14: Wiring diagram for one heating zone
230VAC MAINS E
SUPPLY FUSED AT
N
3AMP
L

Figure 14 details a single heating zone valve, which may be required on systems where gravitation is a
potential issue.
Figure 15: Wiring diagram for two heating zones
E
230VAC MAINS
SUPPLY FUSED AT
N
3AMP
L
DANGER
Ensure the HIU is earthed in accordance with BS EN 7671:2008

A safe means of electrically isolating the HIU must be provided.

The wiring schematics within this document are for guidance only and do not constitute system design.
HIU
T2
T1
HIU
T2
T1
2
3
L
HTG ZONE 1
N
PROGRAMMABLE
E
ROOM STAT
2
3
L
HTG ZONE 1
N
PROGRAMMABLE
E
ROOM STAT
2
3
L
HTG ZONE 2
N
PROGRAMMABLE
E
ROOM STAT
HTG ZONE
VALVE 1
HTG ZONE
VALVE 1
HTG ZONE
VALVE 2
13