Technical information

1
Control Overview—Pump Outputs
Pump Outputs—DHW Recirculation Pump [28] and DHW Production Pump [21]: Contactor
Applicable for Vitotronic 100, GC1*, Vitotronic 300, GW2 and Vitocontrol-S, MW1
1 White [28] and [21] plugs are
plugged into control from
previous control installation
steps.
2 Pre-wired interconnecting
harness for [28] and [21] plug
between DIN rail terminals.
3 Terminals on DIN rail inside of
control junction box.
4 Output voltage 120VAC at
terminal 3 for DHW
Recirculation pump and terminal
4 for DHW production pump.
5 Connected device
120VAC Output
Rated Current: max 2FLA
Recommended connection wire
size: AWG 14
240VAC or 208/575VAC 3PH
Pumps
Please note:
Field supplied contactor and/or
motor starter to power pump from
external power source.
Output from control to activate the
contactor:
Rated current: max. 2FLA
Please ensure 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 to
be connected.
2 Connect pump and power
supply to contactor.
3 Connect contactor coil to the
corresponding terminals.
4 Ensure proper pump rotation.
2
3
*Note: Vitotronic 100, GC1 does not have DHW Recirculation pump output.
DHW
Recirculation
Pump
DHW
Production
Pump
Section 3.5.2
Section 3
4
5
R
5
R
Connection Overview
IMPORTANT
Ensure that all field wiring conforms
to local codes and regulations.
5346540 v1.0 09/2006 Technical information subject to change without notice
48