Honeywell Evohome

Y Plan: Three-port Mid position
valve with a wired boiler
If a wireless boiler relay is used the Orange wire
and feed to pump and boiler are not required.
N E L
PUMP
HTG
N A B
L
RECEIVER
BDR91
DHW
N A B
L
C
RECEIVER
BDR91
1 2 3 4 5 6 7 8 9 10
230V
50Hz
3A RATED
L N E
N
BOILER
E
L
V4073A
MID POSITION
ZONE VALVE
BLUE
G/YELLOW
WHITE
GREY
ORANGE
Figure 10 Mid position
(3 port) valve
G/Yellow: Earth wire
BLUE: Motor Neutral
WHITE: Heating relay
GREY: Hot water relay
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.
47evohome Installation Guide