TFC Group Towerchron QM1 User Manual
Page 12
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12
Always use special 24V thermostat supplied with this boiler, and wire as indicated in boiler instructions
substituting time switch terminals A and B for terminals 3 and 4 respectively on QM1�
Saunier Duval SD625M
Elm Leblanc GVM 420
Boiler with timeswitch and room thermostat
N
D
COM�
S
room stat
D = demand
S = satisfy
COM = common
N
boiler terminals
L
50 Hz AC
220/240V
main supply
1
L
2
3
4
240V 3 AMP
fused supply
240V
3 AMP
fused
supply
frost protection
thermostat (if required)
timeswitch
1
6
3
4
2
5
N
E
L
E
N
L
B
A
C
K
D
H
J
thermostat
ground
boiler connection box
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