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ELECTRICAL CONNECTIONS
Power supply
The boiler operates with a 230 V - 50 Hz single phase supply.
A double pole isolator with a 6 amp fuse or a 6 amp MCB must
be fitted outside the boiler to allow power to be shut off during
servicing and before any repairs are carried out on the boiler.
Conformity
Boiler installation must comply with the prevailing local standards
and legislation.
Safety
The stainless steel tank must be earthed separately.
The power to the boiler must be switched off before
any work is carried out.
WIRING DIAGRAM
HeatMaster wiring diagram legend
60 N, 70 N, 100 N (page 13) and 150 Jumbo (page 14)
1. 230 V power connection plug
2. On/off switch
3. Temperature high limit cutoff indicator (except HM 150 Jumbo)
4. Manual reset high limit thermostat
5. Primary circuit low water pressure indicator
6. Low water pressure switch
7. Time clock
8. Summer/winter switch (except HM 150 Jumbo)
9. Hot water priority link (except HM 150 Jumbo)
10. Burner lockout indicator (except HM 150 Jumbo)
11. Room thermostat connection (option)
12. Central heating pump
13. HeatMaster shunt pump
14. Burner plug connector
15. Water flow switch connection
(option)
16. Thermal reset high limit thermostat 95 °C
17. Control thermostat
18. 230 V servicing socket
(only HM 150 Jumbo)
19. Relay (only HM 150 Jumbo)
INSTALLATION
Electrical connection HeatMaster 60 N, 70 N and 100 N
B. Blue
Bk. Black
Br. Brown
G. Grey
Gr. Green
Or. Orange
Pk. Pink
R. Red
V. Violet
W. White
Y. Yellow
Y/Gr. Yellow / Green
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
11
9
L1 N T1 T2 S3 B4
L1 N T1 T2 S3 B4
L1 N
L1 N
O
I
1
2
3
4
5
6
7
8
10
12 13
14
15
16
17
21
C
12
P
12
C
12
C
5
4
3
103 °C
95 °C
0 - 90 °C
21
C
Y/Gr
Br
Y/Gr
Y/Gr
Or
Or
W
W
Pk
Pk
R
B
B
Or
BB
B
Y
G
Gr
Y/Gr
Y/Gr
Br
B
Y
G
Gr
Y/Gr
Or
G
G
GG
B
B
Or Or
B
B
B
B
Br
B
B
G
Y/Gr
B
Br
Y/Gr
Br
B
Or
Or Br Bk
B
B
B
Bk
W
Pk
Bk
W
PkW