Honeywell Evohome Installation Manual page 47

Figure 7 Connecting a
two port zone valve
G/Y: Green/Yellow
Earth wire
BL: Blue Motor Neutral
BR: Brown Motor Live
GR: Grey End switch (if
used) Permanent Live
O: Orange End switch (If
used). In wired system
this typically feeds
the boiler. When a
wireless boiler relay is
fitted the end switch
is not required
Figure 8
evohome Installation Guide
Connecting a two-port zone valve
BDR91
230V
N L L
50-60Hz
<5A
L
N
Opentherm bridge
Opentherm bridge
A-B:5(3)A
A-C:5(3)A
A B C
G/Y BL BR GR O
M
V4043H
Opentherm equipped boiler
Opentherm input on the boiler ONLY.
Do not connect to the room thermostat
terminals
45