Technical information

5
2
Control Overview—External Controls Connections
BMS Connections—External Change of Heating Program/Mixing Valve Open [143]
Applicable for Vitocontrol-S, MW1 (CT3/VD2/RS/VB2)
1
3
1 Boiler control.
2 Plug [143] used to interconnect
control devices with boiler
control. Ensure Plug [143] is
plugged into the correct socket
found in the boiler control.
3 Field supplied interconnection
wire between Plug [143] and
control device.
4 Field supplied relay:
24VAC
120VAC
24VDC
5 Field supplied control relay.
When coil energized, dry
contact switch is made and
change over or mixing valve
demand takes place.
6 Instead of relays, it may be
possible to use simple switches
to provide similar control
functionality.
External Change of Heating Program OR Open Valves Demand:
Dry contact to [143] plug.
Primary Consideration(s):
Only one selection allowed either External Change of Heating Program or
Open Valves demand.
Select which valves are affected by the change of heating program or
open mixing valve demand.
Configurations:
External change of heating program Plug 143 terminals 1 and 2.
Open mixing valves demand Plug 143 terminals 1 and 2.
Address 91 change required for Change of Heating Program demand.
Address 9A change required for Open Valves demand.
SW
143
146
143
R
4
OR
6
IMPORTANT
Ensure that all field wiring conforms
to local codes and regulations.
Section 4.3
Section 4
1 2 3
Connection Overview
5346540 v1.0 09/2006 Technical information subject to change without notice
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