Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 54

Installation Sequence
Burner Connection, Motor Power Supply
Legend
A Burner motor power supply 240VAC, 1PH
B Connection terminals and plug inside
connection enclosure
C Cable and conduit- factory supplied
D Burner
E Motor starter
F Burner motor
G Connection enclosure on boiler control
54
Vitotronic 300, GW2B Installation and Service
(continued)
Burner motor power supply connection
For burners with 240VAC, 1PH power
supply and connection in conduit.
See burner manual for correct fuse
and wire gauge sizing, and specific
connections for Viessmann controls.
1. Disconnect power to burner and boiler control.
2. Connect 240VAC power to the terminals 21,
22 and 23 on the DIN rail inside the connection
enclosure. Provide fuseable disconnect means
according to local codes.
3. Connect supplied power cable to the motor terminals
on the burner.
4. Connect cable plug to the socket on the DIN rail in
the connection enclosure.