Vaillant 837 E - Page 49

Supplied By www.heating spares.co Tel. 0161 620 6677
Diagrams 11
Instructions for Installation and Servicing turboMAX plus and thermoCOMPACT R1 49
Functional Flow diagram: thermoCOMPACT 615/2 E, 620/2 E, 624/2 E, 628/2 E, 637 E
Fig. 11.2: Functional Flow diagram VU
POWER SUPPLY
F2A
L
2
N
1
MAIN SWITCH
MAIN
TRANSFORMER
230V
20V
AIR
PRESSURE
SWITCH
FAN
PUMP
NTC FLOW
TEMPERATURE
SENSOR
FLAME
SENSOR
GAS
VALVE
F1,25A
NTC RETURN
TEMPERATURE
SENSOR
Burner lock out
indicator (red)
Ignition indicator
MAIN SWITCHBOARD
IGNITION
ELECTRODES
Legend
b blue
br brown
y/g yellow/green
r red
p pink
or orange
t transparent
bl black
gr grey
w white
gr
b
br
y/g
bbr
y/g
br
t
w
t
br
br
r
b
br
y/g
gr
r
CONTROL BOX
plug in
connector
display
plus / minus buttons
reset button
info button
r
bl
b
gr
637 only