Technical information

5
2
Control Overview—External Controls Connections
BMS Connections—Switch in Boiler as Last in Sequence [143]
Applicable for Vitotronic 100, GC1 in conjunction with Vitocontrol-S, MW1 (CT3/VD2)
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
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
boiler is placed at end of the
rotation cycle.
6 Instead of relays, it may be
possible to use simple switches
to provide similar control
functionality.
Switch in boiler as last in sequence:
Dry contact to [143 plug].
Primary Consideration(s):
Changes rotation of current boiler sequence.
Configurations:
Dry contact to 143 plug is connected to terminals 2 and 3.
Closed contact switches boiler to last in burner sequence.
Notes:
Function used if a particular boiler is to be used for a specific period of
time.
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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