Supplied By www.heating spares.co Tel. 0161 620 6677
17
27
FULLY PUMPED ‘Y’ PLAN
28
TYPICAL PROGRAMMER
In the event of the Best being installed on an existing gravity DHW
and pumped heating system with no additional controls being fitted
then the wiring diagram adjacent (Fig. 28)
must
be adhered to.
However it should be noted that this is not recommended because
of the overall lack of control and that the radiators may get hot
when the pump overun is in operation.
CT200
ROOM
THERMOSTAT
L641A
V4073A
CYLINDER
THERMOSTAT
MID POSITION
VALVE
230V MAINS
INPUT
OR
A
B
C
4
5
8
6
5
2
7
8
3
1
2
3
L
N
E
WHITE
BLUE
GREY
ORANGE
GREEN/
YELLOW
1
3
2
1
2
4
5
2
T6360B
ROOM THERMOSTAT
2 1 E N L
L N E
9 8 3 2 1
9 2 3
BOILER
PUMP
6 3
N L
3 4
N L
6 4 3 2 1
Honeywell ST699B 1002
(Link L-5-8) ST 799A
ST6400/ST6300
PROGRAMMER
2=Pump Live
1=Switched Live
L=Permanent Live
230V 50Hz
L
N
HW
OFF
HTG N
L
V4073A
MID
POSITION
ZONE
VALVE
T6360B
ROOM
THERMOSTAT
L641A
CYLINDER
THERMOSTAT
BOILER
TIME
CONTROLLER
1
2
3
4
5
6
7
8
9 10
2
1
3
1
C
GREY
ORANGE
T4360A
FROST
THERMOSTAT
Opens heating
circuit only - use
with programmers
with spot switching
1
3
1
5
OPTIONAL
7
7
1
3 4
N L
ST6200
7
2
WHITE
PUMP
N
E
L
2
1
E
N
L
HW
ON
BLUE
GREEN/YELLOW
HEATING
HOT WATER
EARTH
NEUTRAL
230V FUSED 3 AMP
ROOM
THERMOSTAT
BOILER
TERMINALS
PUMP
PUMP LIVE
SWITCHED
LIVE
PERMANENT
LIVE
2
1
E
N
L
The wiring plan shown is based on the use of 10-way junction box
(Honeywell Part No. 42002116-001).
Junction Box terminal 8 is switched live and terminal 9 is pump live.
