Technical information

2
Control Overview—External Controls Connections
BMS Connections—Burner Disable [150]
Applicable for Vitotronic 300, GW2
Burner Disable:
Dry contact to [150] terminal block
Primary Consideration(s):
Dry contact disable part of the 120VAC burner call-for-heat circuit.
Configurations:
Burner disable contact wired to terminals 16 and 17.
Notes:
Depending on how the field supplied relay is wired, it may be possible to
disable the burner when the relay is powered or not powered. When
jumper 16 to 17 is removed, the control does not have the capability to
maintain minimum boiler water temperature or provide freeze-up
protection.
1 The [150] plug is plugged into
the boiler control during the
installation process. This plug is
yellow in colour.
2 Multiple wire conductor
between [150] plug and the DIN
rail mounted terminal block.
3 Two jumpers are found on the
[150] DIN rail mounted terminal
block. A jumper between
terminals 12 and 15 is removed
when installing the LWCO. The
second jumper is found
between terminals 16 and 17
for BMS connections. This
jumper is removed when
connecting external control
relay. Open contact does not
allow burner call for heat signal.
4 Field supplied relay (dry
contact) to demand burner ON
connected to [150] terminal
block.
Note: Relays used to provide dry
contact demands to [150] terminal
block 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.
Connections to the [150] terminal
block are part of the 120VAC
burner call-for-heat circuit. Ensure
relay contacts or switch are
suitable for this application.
1
3
4
IMPORTANT
Ensure that all field wiring conforms
to local codes and regulations.
R
IMPORTANT
No minimum boiler water
temperature or freeze-up protection
when control is disabled.
Section 4.2
Section 4
Connection Overview
5346540 v1.0 09/2006 Technical information subject to change without notice
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