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Functional description
2 Functional description
T2-BT control extension
The T2-BT control extension adds an ETAtouch
control panel and additional interfaces to the existing
ETAtouch controller.
Possible extensions include:
• 2 extra heating circuits with mixing valve
• 1 extra hot water tank
• 1 extra fresh water module
• Solar heating system with 1 or 2 tanks
• Solar heating system with stratified charging
module
A circulation pump, or a light or horn to indicate mal-
functions, can be connected with the integrated sup-
plementary relay (potential-free changeover contact).
A USB flash drive is supplied with each control
extension for storing the configuration. We
recommend keeping it in the wall housing.
T4-0 control extension
The T4-0 control extension with the MK-E circuit board
can be optionally added to the control extension's wall
housing.
Extension:
• 2 extra heating circuits with mixing valve
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