Technical information

1
Control Overview—Pump Outputs
Pump Outputs—DHW Recirculation [28] and DHW Pump [21]: Dry Contact Control Signal
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.
Field supplied 120VAC relay.
Relay can either be mounted in
control junction box or
remotely.
120VAC Pump Output
Rated current: max 2FLA
Recommended connection wire
size: AWG 14
2
3
*Note: Vitotronic 100, GC1 does not have DHW Recirculation pump output.
Section 3.5.2
Section 3
4
DHW
Recirculation
Pump Output
Signal
DHW
Production
Pump Output
Signal
R R
5
5
IMPORTANT
Contact rating of field supplied
contactor or relay will determine the
loads that can be switched. Consult
contact rating information on the
side of relay/contactor housing or
manufacturer directly
IMPORTANT
Ensure that all field wiring conforms
to local codes and regulations.
Connection Overview
5346540 v1.0 09/2006 Technical information subject to change without notice
49