Vaillant sensoCOMFORT VRC 720f Operating And Installation Instructions page 90

4 -- Using the functional modules, basic system diagram, start-up
Abbreviation Meaning
13 Ventilation unit
14a Supply air outlet
14b Extract air inlet
14c Air filter
14d Reheater
14e Frost protection element
14f Silencer
14g Restrictor flap
14h Weather guard grille
14i Extract air box
14j Air humidifier
14k Air dehumidifier
14l Air manifold
14m Air collector
15 Cylinder ventilation unit
BufBt Bottom buffer cylinder temperature sensor
BufBtCH Bottom temperature sensor for heating sec-
tion of buffer cylinder
BufTopCH Top temperature sensor for heating section
of buffer cylinder
BufBtDHW Bottom temperature sensor for DHW section
of buffer cylinder
BufTopDHW Top temperature sensor for DHW section of
buffer cylinder
C1/C2 Enable cylinder charging/buffer cylinder
charging
COL Collector temperature sensor
DEM[x] External heat demand for the heating circuit
DHW Cylinder temperature sensor
DHWBt Bottom cylinder temperature sensor (do-
mestic hot water cylinder)
DHWBt2 Cylinder temperature sensor (second solar
cylinder)
EVU Energy supply company switching contact
FS[x] Flow temperature sensor for heating cir-
cuit/swimming pool sensor
MA Multi-function output
ME Multi-function input
PV Photovoltaic inverter interface
PWM PWM signal for pump
RT Room thermostat
SCA Cooling signal
SG Transmission system operator interface
Solar yield Solar yield sensor
SysFlow System temperature sensor
TD1, TD2 Temperature sensor for a differential temper-
ature control
TEL Switch contact for remote control
TR Isolating circuit with switching floor-standing
boiler
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Operating and installation instructions sensoCOMFORT 0020288151_00