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Connection details for control systems utilising 3 port motorised valve
via external wiring centre/junction box
Diagram only applies to the specific controls mentioned
3 amp fused
THERMOcompact
main supply
terminal strip
L
N
L
N
L
N
L
N
External wiring centre/junction box*
N
L
N
*Do not use pre-wired printed circuit board type
8
4
7
Cylinder thermostat
ACL Drayton HTS3
2
1
C
Danfoss Randall ATC
3
2
1
Tower CS1
YL
BK
RED
Honeywell L641
2
1
C
Horstmann HTC1
3
2
1
Siemens-Landis & Staefa RAM 1
3
2
1
Sunvic SA 2452
2
1
3
E
EARTH
3 Port mid position motorised valve
Fig. I.17
Lifestyle LP241, LP 522, LP 722
Tempus 6, Tempus 7
Danfoss Randall CP 715, FP715
Note:
*Earth not required
Danfoss Randall Set 2E, Set 3E
Note:
*Earth not required,
Link L - 2 - 5
Grässlin Towerchron QE2
Honeywell ST699B, ST799A
Note:
Link L - 5 - 8
Honeywell ST6200, ST6300, ST6400
Horstmann Channel Plus H21, H27
Note:
*Earth not required,
Link L - 2 - 5
Siemens-Landis & Staefa RWB2, RWB9
Potterton Myson EP 2002, EP 3002, EP 6002
Note:
Link L - 5
Sunvic Select 207
Fig. I.18
Programmer
for programmer connections see fig. 16.b
3
4
5
E
3
4
5
E
3
4
5
6
7
8
9
L
E
Room thermostat
Vaillant VRT 9090
E
ACL Drayton Digistat 2, 3, 4
ACL Drayton RTS 1, 2
Danfoss Randall RX-1
Danfoss Randall RMT 230
E
Danfoss Randall RET 230
Tower SS
Honeywell T6360
Horstmann HRT 1
Siemens-Landys & Staefa RAD 1
Sunvic TLX 2000 series
5
9
8
4
BROWN
BLUE
OR
GREY
ORANGE
WHITE
N
L
1
2
not used
5
3
8
E
N
L
1
5
3
8
E
N
L
1
not used
*
5
3
8
E
N
L
1
*
5
3
7
N
L
1
2
not used
5
3
8
L
N
3
4
not used
3
5
6
N
L
1
2
not used
5
3
8
E
N
L
1
*
5
3
7
N
L
1
2
not used
5
3
8
E
N
L
1
5
3
8
N
L
1
2
not used
5
3
8
BOILER INSTALLATION SEQUENCE
CENTRAL
HOT
HOT
N
L
HEATING
WATER
WATER
ON
ON
OFF
5
3
6
7
8
10
not used
5
9
6
L
N
E
E
C
A
3
1
N
3
L
3
2
C
B
4
2
1
N
3
L
4
2
1
E
2
3
1
4
2
1
E
2
1
E
4
1
3
E
3
4
7
6
2
3
4
not used
7
6
2
3
4
7
6
2
3
4
5
6
not used
8
6
3
4
7
6
5
6
7
8
7
8
3
4
7
6
2
3
4
5
6
not used
8
6
3
4
7
6
2
3
4
5
not used
7
6
3
4
7
6
Controls
(THERMOcompact boiler)
External electrical controls
The boiler terminals 3, 4 and 5 are
for connecting external
electrical controls such as a
programmer, room thermostat, etc.
Terminals 3 and 4 are linked together
when the boiler is supplied. If external
controls are used, this link must be
removed, and the controls connected
across terminals 3 and 4.
Terminal 5 is an additional neutral
connection for external controls.
Connection of external electrical
controls
Connection details using an external
wiring centre
The boiler should be connected to the
system controls using an external
wiring centre. Fig. 17, 18 shows
connection details for a system
utilising a 3 port mid position
motorised valve, figure 19, 20 shows
the connection details for a system
utilising two 2 port motorised valves
connected via an external wiring cent-
re (Important: the arrowed numbers
indicate connection into the relevant
terminal of thre external wiring
centre).
35
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