Connecting A Burner; Preparing Boilers For Cascade Mode - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B & MW1B Installation and Service
Connecting the Burner
Legend
A To the Vitotronic control
B To the burner (burner control unit)
C KM BUS cable

Preparing Boilers for Cascade Mode

Installation, Vitotronic 300, GW5B
The burner cables are included in the standard boiler
delivery.
Max. power consumption 3A.
Terminal codes
L Burner control power supply
Ground conductor to burner
?
N Neutral conductor to burner
T1 120V~ from boiler control unit
T2 Base load demand
S3 Connection for burner fault
B4 Connection for hours run meter
IMPORTANT
The following procedure must be done to configure each
boiler for constant temperature control (cascade control)
mode.
1. Turn on the boiler and set the language then press
'OK'.
2. Set the time and date and press 'OK'.
Refer to the boiler Installation Instructions.
3. Press and hold OK and
up.
4. Scroll using to the service functions, press OK.
5. Scroll using to the multi-boiler system.
6. Press OK.
7. Scroll using to "Yes".
8. Press OK.
Note: The boiler will restart in cascade mode.
9. Set the language and press 'OK'.
Refer to the boiler Installation Instructions.
until service menu comes
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