IntesisBox FJ-RC-MBS-1 User Manual page 11

Where:
- setpoint value currently applied to the indoor unit
S
AC
- setpoint value written at Modbus side (register 4/5)
S
u
- external temperature reference written at Modbus side (register 22/23)
T
u
- ambient temperature that the indoor unit is using as the reference of its
T
AC
own control loop (register 5/6)
When FJ-RC-MBS-1 detects a change in any of the values of
{ S
, T
u
After the startup, the value for "external temperature's reference" (register
o
22/23) has a value -32768 (0x8000). This value means that no external
temperature reference is being provided through FJ-RC-MBS-1. In this scenario,
the setpoint value shown in register 4/5 will always be the same as the current
setpoint value of the indoor unit. AC indoor unit will use its own return path
temperature sensor as reference for its control loop.
When the mechanism of "Virtual Temperature" is applied. The temperature
o
setpoint's value shown by the Remote Controller or other Control System from
Fujitsu connected to the indoor unit may show a different value from the value
shown in register 4/5.
If it is desired to use the temperature's reading from the Remote Control as the
o
external temperature reference (T
be configured as Master, and the Fujitsu AC indoor unit must have the option
"thermostat sensor in the Remote Controller" as activated. This configuration is
done via a Fujitsu Remote Controller connected to the indoor unit and must be
done by Fujitsu authorized installers while the AC is being installed.
When FJ-RC-MBS-1 is set as "Master" of FG bus (BWR), the external
o
temperature's sensor connected to Modbus RTU EIA-485 network provides
directly the value currently applied to the indoor unit ( S
the Virtual temperature is not applied. In this case, the Remote Controller or any
other Control System connected from Fujitsu is not able to send the external
temperature reference's value to the register 22/23.
• AC Real temperature setpoint (R)
(register 23 – In Protocol address / register 24 – in PLC address):
As it has been detailed on the previous point, the real temperature setpoint in the indoor
unit and the temperature setpoint requested from FJ-RC-MBS-1 might differ (when a
value in register 22/23 – "external temperature reference" is entered). This register
always informs about the current temperature setpoint which is being used by the indoor
unit – it is also includes the temperature setpoint that will be shown by an additional
remote controller from Fujitsu connected to the indoor unit, if it is present on the
system.
Moreover, notice that temperature's values of all these four registers are expressed according to
the temperature´s format configured through its onboard DIP-Switches (See 4.3 "DIP-switch
Configuration Interface"). These following formats are possible:
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This information is subject to change without notice
IntesisBox ® is a registered trademark of Intesis Software SLU
FJ-RC-MBS-1
}, it will send the new setpoint (S
, T
u AC
) to the indoor unit.
AC
,register 22/33), the Remote Controller must
u
URL
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Phone
User's Manual r1.9 EN
), and the process of
AC
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