Plant Cooling/Heating Function Enabling From Ta - TESY MultiThermica User's And Installer's Manual

FUnCTIon SETTInG InDooR UnIT WITH InTEGRATED WATER TAnK
INDOOR UNIT WITHOUT INTEGRATED WATER TANK
Check the primary pump head with the pressure drop of the plant. If this is not sufficient, manifolds must be provided on

the delivery and return lines of secondary pumps.
5�2�2 Plant cooling/heating function enabling from TA
The connection and activation of an external consents (TA) is essential for the operation of the unit:
• TA from room thermostat
• TA from Modbus Supervisor
The two types of TA consents can co-exist and the unit will activate when it receives a call from at least one of the two .
TA from room thermostat or a generic potential-free contact contact
Function Logic:
The TA must be connected to digital input PI3:
• on the terminal board of the indoor unit
Contact logic:
• Closed contact: the unit is switched on for heating or cooling the plant water.
• Open contact: the unit is switched off for heating or cooling the plant water
If the domestic hot water function is active, this function has priority even when the contact is open.

TA from Modbus Supervisor
Function Logic:
The room thermostat is enabled by Modbus Supervisor and controlled by the Modbus register with address 10.
Logic of the register:
The call is managed by the Modbus Supervisor.
• Value 1: the unit is switched on for heating or cooling the plant water.
• Value 0: the unit is switched off for heating or cooling the plant water.
If the domestic hot water function is active, this function has priority.

Enabling:
Use must be enabled by parameter "ATM"
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p. 22
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