13
12
Honeywell ‘Y’ plan - fully pumped hot water and heating
Boiler
stat
Boiler
burner
Cooker
programmer
Cylinder stat
L641A or equivalent
V40 73A Mid position
Valve or equivalent
Room stat
T6306B or equivalent
Pump (2.5 amp max)
Cooker
burner
Boiler
status
neon
Cooker
status
neon
Boiler
Limit stat
Hot water
C
1
E
C
2
E
C
2
1
E
C
2
E
C
2
1
2
1
2
5
4
EN
NE
N
E
L
3
3
2
1
L
N
E
1
2
3
4
5
6
7
8
9
10
11
12
G
R
E
Y
B
L
U
E
G
R
E
E
N
/Y
E
L
O
R
A
N
G
E
W
H
IT
E
Internal wiring
External wiring
Cooker
Limit stat
Mains
E
supply
L
(3 AMP N
fuse)
Cooker
stat
Heating/
Hot water
V4073A
6
HORSTMANN
H37XL
Boiler
stat
Boiler
burner
Cooker
programmer
Cylinder stat
L641A or equivalent
DHWS Cylinder primary
motorised valve
-28mm V4043H
or equivalent
Heating circuit
motorised valve
V4043H
or equivalent
Room stat
T6306B
or equivalent
Cooker
burner
Boiler
status
neon
Cooker
status
neon
Boiler
Limit stat
Hot water
C
1
E
C
2
E
C
2
1
E
C
2
E C
2
1
2
3
1
EN
NE
L
E
N
2
1
2
3
4
5
6
7
8
9
10
11
12
B
R
O
W
N
B
L
U
E
G
R
E
Y
O
R
A
N
G
E
G
R
E
E
N
/Y
E
L
Internal wiring
External wiring
Cooker
Limit stat
Mains
E
supply
L
(3 AMP N
fuse)
Cooker
stat
Heating/
Hot water
Honeywell ‘S’ plan - fully pumped hot water and heating
B
R
O
W
N
B
L
U
E
G
R
E
Y
O
R
A
N
G
E
G
R
E
E
N
/Y
E
L
Pump (2.5amp max)
V4043H
V4043H
5
4
3
2
1
L
N
E
6
HORSTMANN
H37XL
Honeywell ‘Y’ Plan - Fig.4
Honeywell ‘S’ Plan with heating and hot water timed together - Fig.5