Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 45

Vitotronic 300, GW2B Installation and Service
Vitotronic 100, GC1 with 30% LTP Package
30% LTP Package consists of:
- 1 circulation pump
- 1 cast iron flange set
- 2 full port ball valves
- 1 flow check valve
- 1 17B sensor (strap -on)
Legend
A Vitotronic 300 GW5B
B Junction box
C Return temperature 2 aJB
D Return temperature 1 aJA
E Shunt pump sÖA1
F Boiler pump sL
(VD2 only)
Each pump output: 120V single phase
Max. pump current: 2 FLA
IMPORTANT
Pump current larger than 2 FLA will require a contactor
or isolation relay (see page 41).
Mandatory Coding Address Changes
0C:5 - Modulating isolation valve
(independant of boiler water temperature).
0d:2 - Switching contact
4A:1 - 17A Sensor installed
4b:1 - 17B Sensor installed
4C:2 - Connections at plug 20A1
Therm control switch contact
4d:2 - Boiler circuit pump
Installation Sequence
45