Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 31

Connection of the Pumps (CM2 only)
Available pump connections
A1/M1Heating circuit high
sÖ
temperature (without mixing valve)
Terminals 7 - L, - G , - N
sA Circulation pump for heating
up the domestic hot water tank -
Terminals 6 - L, - G , - N
Shunt pump, boiler circuit pump
sL
Terminals 8 - L, - G, - N.
DHW recirculattion pump
sK
terminals 5 - L, - G, - N
M2 Heating circuit high
sÖM2
temperature (with mixing valve)
Terminals 4 - L, - G , - N
M3 Heating circuit high
sÖM3
temperature (with mixing valve)
Terminals 3 - L, - G , - N
Install pumps: see
manufacturer's
instructions.
120 VAC pumps
Note:
The maximum power consumption of
all pumps is 4A .
Rated current: max. 2 FLA
Recommended connection
cable: AWG 14
Use contactor for pumps with higher
current rating
Connect the 3-wire cable from the
pump to the corresponding terminals.
Installation
240 VAC or 3 PH pumps
Please note:
Use contactor and/or motor starter to
power pump.
For activating the contactor:
Rated current: max. 2 FLA
Recommended connection
wire size: AWG 14
Please ensure that all connections and
wire sizes comply with local and
national codes.
1.Select the contactor and the
connecting wire in accordance with
the rating of the pump that is to be
connected.
2.Connect pump and power supply to
the contactor.
3.Connect contactor coil to the
corresponding terminals.
31