Wiring Diagrams - Viessmann Vitogas 050 Rs Series Installation & Service Manual

Vitogas 050, RS single stage with Vitotronic control (Natural gas)
Refer to wiring label affixed
to boiler access panel,
Viessmann reserves the right
to substitute components or
wiring methods. Boiler wiring
label takes precedence.
Honeywell S8600B ignition control
15 sec
lockout
PV
24V
GND
PV GND
MV MV BRN
Yel
Blk
Yel
Blk
Grn
ITT S311
pilot
gas valve
Ionization
electrode
Org
PV
Blk
PV/ MV
MV
Redundant Honeywell
gas valve
V8943A valve has
"PV/MV" and "PV"
terminal designations
22
Vitotronic Boiler Control
Refer to internal wiring diagram supplied with the
Vitotronic Contol
S S
E P
T N
A
H S R
24V W E K
Class II
Transformer
40 VA
Landis & Gyr
QSZ1 pilot
pilot burner
Ignition
electrode
Org
Blk
Gas flow
Blk
Main Honeywell automatic gas valve
and regulator V8943B valve has
"PV/MV" and "PV" terminal designations
To #41
Connection
Boiler 7-pole
#41 plug
Boiler 7-pole
Factory wired
#41 plug
junction box
Do not connect
additional 120V
to this junction box
PV
PV/MV
MV
FHL – Safety limit
manual reset fixed
(fixed at 120°C, 248°F)
AHL – Operating limit
adjustable aquastat
Do not operate burner without boiler control
Never bypass safety high limit aquastats
Adaptor harness
(only for use with damper)
5-pole
Viessmann vent damper
(optional)
If vent damper not installed, connect two boiler
7-pole #41 plugs together.
Caution: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation
after servicing.
Warning! Disconnect power before
servicing boiler
If any of the original wire as supplied with the
appliance must be replaced, it must be replaced
with 105°C rated or its equivalent. Minimum size
16 AWG.
53 plug
53 plug
Motor