Heatrae Sadia Megalife 100E Installation Manual page 10

Fig: 05. Schematic Wiring Diagram - Basic 2 x 2 port valve system
NOTES: Control terminal numbering may differ from those shown.
Refer to instructions with controls selected.
A double pole isolating switch must be installed in the mains supply.
All earth connections must be connected back to the mains earth supply.
Fig: 06: Schematic Wiring Diagram - 2 port valve in conjunction with 3 port mid position valve system. (Y plan).
KEY
Bl Blue
Br Brown
G Grey
O Orange
GY Green/Yellow
DHW Domestic Hot Water
HTG Heating
L
N
NOTES:
1. A double pole isolating switch must be installed in the mains supply.
2. All earth connections must be linked back to the mains earth supply.
3. Assumes basic boiler with external pump.
4. Use copper links supplied to make connections between terminals.
5. Do not mount wiring centre on cylinder.
6. The above diagram is for guidance only.
10
Cylinder terminal block
Zone valve (HTG)
G Br Bl 0
GY
1 2 3
(Supply)
L N
3 4 5 6 7 8 9 10
1 2
1 2 3 4 5 6 7 8 9 10
1 2 3
L N
HTG DHW
ON ON
Programmer
Programmer
L N
HTG DHW
ON ON
2 3 4 5 6 7 8 9
1
1
3 2
Room stat
1 2 3
3
Room stat Zone valve (DHW)
1 3 2 G
2 1
2 3
L N
Boiler
Cylinder terminal block
(supplied fitted)
DHW 1 2 3
OFF
11 12 13 14 15 16
10
Bl W G O GY
3-port mid position valve
Br Bl 0
2
Junction box
L
3
N
Pump
(DHW) 2-port
Bl Br G O GY
L
N N L
Boiler Pump