Technical information

Control Overview—External Controls Connections
BMS Connections—Single/Multiple Boilers—Burner Disable [146]
Applicable for Vitotronic 100, GC1 (without communications)
Burner Disable:
Dry contact to [146] plug
Primary Consideration(s):
Boiler does not maintain minimum boiler water temperature.
Burner operation can be started with override switch
Configurations:
Burner disable dry contact wired to Plug 146 terminals 2 and 3
Boiler coded for 01:03
Notes:
Minimum boiler water temperature is not maintained when contact open.
Boiler temperature set point cannot be adjusted on the user interface.
Boilers which require minimum temperature protection will operate until
minimum temperature is satisfied upon receiving a demand signal.
1 Boiler control.
2 Plug [146] used to interface
disable signal to control via
terminals 2 and 3.
Open contact disables burner.
3 Field supplied relay and wiring
interconnections.
4 Field supplied relay to provide
burner disable when contact is
open between terminals 2 and
3.
Note: Relays used to provide dry
contact disable to plug 146 is
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.
IMPORTANT
No minimum boiler water
temperature or freeze-up protection
when control is disabled.
Section 4.1
Section 4
2
1
146
R
143
146
4
3
1 2 3
Connection Overview
5346540 v1.0 09/2006 Technical information subject to change without notice
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