Vaillant VCW 2O Instructions For Installation And Servicing page 16

HORSTMANN 125
COFONET
Time Switch
Do not link
terminals
L a n d 5 !
N
t . i n "
L
SuPPIY
J
2r0v/50H2
3
o
F i g . 2 3
V A I L L A N T
Foomlhetmostat
v R T 3 7 8
l':-'
O
VAILLANT
Roomthermostat
VRT 378
0
N Mains
L SUPPIY
+ 24ovl5oHz
B
1 6