59
Figure 8-9:
Heating system controls – S-plan type system connection diagram
2-Port Zone Valve
Motor
Room
Stat
2 1 3
240V
50HZ
L N E
13A
Fuse
2-Port Zone Valve
Motor
1
2
3
4
5
6
7
8
9
10
HTG
HW
Pump
Wiring
Centre
Grey
Grey
Orange
Orange
Brown
Blue
Green/Yellow
Brown
Blue
Green/Yellow
Blue
Green/Yellow
Brown
Link
Cylinder
Stat
1
C
2
E
N
L
L N E
5A
Fuse
PL N SL
L1 N L2
Four-way plug (comes fitted
to four-way socket on rear
of Grant Spira Hopper)
N
Grant 2-Channel
Wall Mounted
Programmer ESKIT
L 1 2 3 4
OFF OFF ON ON
HW HT HW HT
Frost
Thermostat
Pipe Thermostat
(If fitted)
Use 4-Core flex at least
1.5mm² between junction
box and hopper*
}
Permanent Live
Earth
Neutral
Switched Live
Permanent Live
Neutral
!
NOTE
All cable to be 0.75mm
2
minimum
unless otherwise shown.
*See Figure 8-11 for wiring Pressure
Switch Kit for use with plastic pipe in
installation
