Technical information

Control Overview—External Controls Connections
BMS Connections—Single/Multiple Boilers—Burner Demand
Applicable for Vitotronic 100, GC1 (without communications)
Burner Demand:
1st stage: dry contact to 143 plug
2nd stage: dry contact to 143 plug
Primary Consideration(s):
Boiler will not maintain minimum boiler water temperature as long as
contact at [146] plug is open.
Burner will fire when control detects demand signal at [146] plug.
Control will provide call for heat to burner until boiler reaches minimum
boiler water temperature based on coding card.
Configurations:
1st stage demand dry contact wired to Plug 143 terminals 1 and 2.
2nd stage demand wired to Plug 143 terminals 2 and 3.
Dry contact “enable” wired to Plug 146 terminals 2 and 3.
Boiler coded for 01:03.
Boiler maximum temperature limit address 06.
1
143
R R
146
R
143
146
2 3 4
1 Boiler control.
2 Field supplied relay and wiring
interconnections to call burner
onto low fire.
3 Field supplied relay and wiring
interconnections to call burner
onto high fire.
4 Field supplied relay and wiring
interconnections to provide
operation demand when contact
is closed between terminals 2
and 3.
Note: Relays used to provide dry
contact demands to plugs [143]/
[146] are controlled by local BMS
or system controller. The relay coil
voltage must be compatible with
the system that is controlling it.
Some examples of this are 24VAC,
120VAC and 24VDC.
IMPORTANT
Ensure that all field wiring conforms
to local codes and regulations.
Section 4.1
Section 4
Connection Overview
1 2 3
1 2 3
IMPORTANT
Record all coding changes for future
reference.
Ensure only knowledgeable coding
changes are made.
5346540 v1.0 09/2006 Technical information subject to change without notice
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