35
BOILER INSTALLATION SEQUENCE
Connection details for control systems utilising 3 port motorised valve
via external wiring centre/junction box
Diagram only applies to the specific controls mentioned
L
N
L
N
3
4
5
E
N
L
CENTRAL
HEATING
ON
HOT
WATER
ON
HOT
WATER
OFF
3 amp fused
main supply
THERMOcompact
terminal strip
Programmer
for programmer connections see fig. 16.b
L
N
L
N
3
4
5
E
5
3
6
7
8
External wiring centre/junction box*
3
4
5
6
7
8
9
10
N N L L
*Do not use pre-wired printed circuit board type
not used
EARTH
BLUE
BROWN
OR
WHITE
GREY
ORANGE
3 Port mid position motorised valve
4
E
5
8
9
E
C
A
N
4
N
4
2
4
4
3
3
3
3
3
2
2
2
2
1
1
L
2
1
L
1
1
1
1
3
C
B
E
E
E
E
Vaillant VRT 9090
ACL Drayton Digistat 2, 3, 4
ACL Drayton RTS 1, 2
Danfoss Randall RX-1
Danfoss Randall RMT 230
Danfoss Randall RET 230
Tower SS
Honeywell T6360
Horstmann HRT 1
Siemens-Landys & Staefa RAD 1
Sunvic TLX 2000 series
5
9
6
L
N
E
Room thermostat
2
1
C
YL
3
3
2
2
BK
1
2
2
1
1
RED
C
1
1
3
ACL Drayton HTS3
Danfoss Randall ATC
Tower CS1
Honeywell L641
Horstmann HTC1
Siemens-Landis & Staefa RAM 1
Sunvic SA 2452
8
4
7
E
Cylinder thermostat
3
E
2
E
N
L
2
3
4
5
3
8
7
6
1
not used
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
N
L
2
3
4
5
3
8
7
6
1
E
N
L
2
3
4
5
3
8
7
6
1
E
*
N
L
2
3
4
5
3
7
8
6
1
E
*
5
6
N
L
2
3
4
5
3
8
7
6
1
N
3
5
6
7
5
6
7
8
4
L
3
8
N
L
2
3
4
5
3
8
7
6
1
N
L
2
3
4
5
3
7
8
6
1
E
*
5
6
N
L
2
3
4
5
3
8
7
6
1
N
L
2
3
4
5
3
8
7
6
1
N
L
2
3
4
5
3
8
7
6
1
E
5
not used
not used
not used
not used
not used
not used
not used
not used
not used
not used
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).
Fig. I.17
Fig. I.18
THERMOcompact
