Specifications

a
1,7,
Thcrmostatic
radiator valves
l$rere
TRVs and a
clock
are used the
ilibfrirg
side of the clock is connected
betreen
teminals 3 and
4.
lYhere
no clock is used a
wire
bridge
must be
inserted between
lerminals 3 and 4.
Setthe
pump
control to
position
ll.
VCW-Terminal
VAILLANT
Roomthermostat
VBT378
0
RANDALL
TimeSwitch 103
Do
not link
terminal3
& 6
N
Mains
L
Supply
I
Fig.21
24OV/5OHz
VCW-Terminal
SWITCHMASTER
300
Time
Switch
REMOVE
1)
Link N
and 2
2)
Link
L and:4
N
Mains
L
Supply
3
O
VAILLANT
Roomthermostat
VRT378
0
24OVlsOHz
15