Virtual Temperature Function - HMS Networks Intesis IN485FGL001I000 User Manual

IN485FGL001I000 Gateway

9. Virtual Temperature Function

IMPORTANT
This function is only available when a communication accessory is not used to connect the gateway
to the Fujitsu AC unit.
Typically, the temperature sensor used by Fujitsu indoor units
inside the indoor unit itself. This may provoke a substantial difference between the temperature perceived by
this sensor and the temperature perceived by the room occupants, especially if the indoor unit is mounted away,
such as on a high ceiling or a distant wall.
NOTE
1
Referring to the indoor units compatible with this IN485FGL001I000 gateway.
Figure 5. In this case, the room temperature is four degrees Celsius less than the temperature perceived by the
Also, Fujitsu AC systems don't allow the IN485FGL001I000 gateway to provide the reference temperature, i.e., to
overwrite the value reported by the indoor unit's sensor, which is the value the AC system uses as the reference
temperature.
To overcome these issues, this IN485FGL001I000 gateway implements the Virtual Temperature function.
With the Virtual Temperature function, the gateway uses the value reported by a temperature sensor from the
BMS side, i.e., a sensor connected to the BACnet or Modbus installation, to apply a formula that establishes the
setpoint temperature for the indoor unit. This recalculated setpoint can effectively be sent to the AC system by
the gateway to overwrite the AC system's reference temperature and, at the same time, it offsets the difference
between the real temperature in the room and the temperature perceived by the indoor unit.
NOTICE
To use the value reported by the BMS side's sensor, the gateway implements the BACnet object
RoomTemperature_command (Analog Output) and the Modbus register Input sensor temperature
(protocol address 22 / PLC address 23)
To know more about all the objects dedicated to temperature settings, see
Temperature Signals (page
Page 66 of 74
1
to establish the temperature setpoint is placed
indoor unit's sensor.
2
.
67).
Virtual Temperature Function
Considerations on
USER MANUAL Version 1.0.9