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Start-up - initial settings and functions
8.1.6 Terminology used
The terms related to this unit are shown in the table below
Parameter Description
AHS Backup boiler
IBH Backup electric heater
P_i Unit pump or Zone 1 pump (for double zone systems)
P_o Secondary circuit pump (or Zone 1 pump for double zone systems)
P_c Zone 2 pump (for double zone systems)
P_d DHW recirculation pump
P_s Solar circuit pump
Pe Evaporation pressure in Cooling mode or condensation pressure in Heating mode
SV1 3-way circuit/DHW diverter valve
SV2 3-way diverter valve for direct double zone systems
SV3 3-way mixing valve for mixed circuit
T1 Water supply temperature from additional heating source (with IBH heater or AHS boiler)
T2
Refrigerant temperature entering the user side exchanger (plate heat exchanger) in
Cooling mode (or leaving in Heating mode)
T3
Refrigerant temperature leaving the source exchanger (coil) in Cooling mode (or entering
in Heating mode)
T4 Outdoor air temperature
T5 DHW tank temperature
T1S Water supply temperature setpoint
Ta Room air temperature, detected by the probe in the HMI
Tbt1 Temperature of the upper part of the inertial storage tank
TBH Backup electric heater for DHW (Domestic Hot Water) storage tank
Th Compressor suction refrigerant temperature
Tp Compressor discharge refrigerant temperature
Tsolar Water temperature in the solar thermal circuit
Tw2 Water supply temperature for the mixed zone (for double zone systems)
TWin Unit water return temperature
TWout Unit water supply temperature
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