Burner Control Unit Connection Diagram - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service

Burner Control Unit Connection Diagram

WARNING
Disconnect power inside the boiler junction box, before
servicing boiler.
A Burner control unit interface VUC 310/base
B Flame sensor aA
C Vitotronic control unit
D Servomotor for burner inlet damper
E Ignition unit gF
F Gas valve V1 dG
G Gas valve V2 dH
H Fan motor with PWM control and feedback
I Boiler temperature sensor 1 3A
J Boiler temperature sensor 2 3B
K AC-EMI suppression filter device
L Flue gas temperature sensor 1
M Burner display and programming unit
N Gas pressure switch (outlet pressure at first valve
seat) kJ GDW2
O Inlet fan pressure switch acA (APS1)
P Inlet gas pressure switch ayA GDW1
Q Flue gas temperature sensor 2
R Overfire pressure switch
100A
15A
15B
(APS2)
131A
CAUTION *
Provide disconnect means and overload protection as
required.
F1 Fuse
F2 Fuse
F6 Fixed high limit
F7 Adjustable high limit (AHL)
H1 Hours run meter, modulation (Vitotronic control)
H2 Fault message (Vitotronic control)
S1 ON/OFF switch (only to the boiler control,
line voltage still present at burner base)
avG KM-BUS
fA Boiler control wiring to burner
Power supply, 120 VAC, 60Hz
40
/abH Boiler control to burner base wiring
40
Burner modulation controller "+" Up
90
/ Flue gas damper (accessory optional)
53 100
B1 Boiler junction box (cable
B2 Burner base (cable
40
B3 Burner contactor
Connection Diagram
"-" Down
40 pre-wired)
/abH supplied)
53