Installation Instructions

45evohome Installation Guide
Two-port zone valve
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
relay box is fitted the end
switch is not required.
Connecting an Opentherm bridge
Figure 8 Wiring an
OpenTherm Bridge to
an OpenTherm boiler.
If connecting a two
port zone valve with
an unvented cylinder
connection for a high
limit thermostat, the 'L'
permanent live feed must
be broken when high limit
cutout activates on the
insertion thermostat.
!
230V
50-60Hz
<5A
N L L
BDR91
V4043H
A-B:5(3)A
A-C:5(3)A
A B C
L
N
BL BR
M
GR O
G / Y
Opentherm input on the boiler ONLY.
Do not connect to the room thermostat
terminals
Opentherm bridge
Opentherm equipped boiler