Technical information

Control Overview—External Controls Connections
BMS Connections—Single/Multiple Boilers—Burner Demand [146]
Applicable for Vitotronic 100, GC1 (without communications)
Burner Disable:
Dry contact to [146] plug
Primary Consideration(s):
Boiler maintains minimum boiler water temperature.
Burner operation can be started with override switch.
Configurations:
Burner demand dry contact wired to Plug 146 terminals 2 and 3.
Boiler coded for 01:01.
Notes:
Minimum boiler water temperature maintained when contact open.
Boiler temperature set point can be adjusted on the user interface.
Demand contact closure causes boiler temperature set point to be based
on address 9b.
Boiler switch-off differential address 13.
Boiler maximum temperature limit address 06.
1 Boiler control.
2 Plug [146] used to interface
demand signal to control via
terminals 2 and 3.
Closed contact demands burner
if boiler water temperature
below 9b setting.
3 Field supplied relay and wiring
interconnections.
4 Field supplied relay to provide
burner demand when contact is
closed between terminals
2 and 3.
Field supplied relay
24VAC
120VAC
24VDC
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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