Hitachi PC-ARF Technical Catalogue page 581

6 Building air conditioning controls
CSNET Manager LT/XT
TSet Limits:
•
USERMAX: Maximum Setting temperature. If the selected temperature is higher, CSNET will use USERMAX
-
as the value for the Setting temperature, changing this value as soon as the operation mode changes.
- Pre set adjustment: +25°C.
- 1°C steps.
17°C... 30°C margin.
-
- USERMIN: Minimum Setting temperature. If the selected temperature is lower, CSNET will use USERMIN as
the value for the Setting temperature, changing this value as soon as the operation mode changes.
- Pre set adjustment: +20°C.
1°C steps.
-
- 17°C... 30°C margin.
After adjust previously parameters, if unit is working in Auto Cool/Heat mode, it will be displayed on the status zone which
option is currently doing.
Considerations for the use of the Auto Cool/Heat mode
When the Auto Cool/Heat is used, the difference of 4°C programmed in the heating mode of each indoor unit should be
cancelled in all of them. Otherwise, there may be a conflict between the system program and the CSNET program. (See the
Service Manual of the indoor unit for details about cancelling this misadjustment using the optional function b1). However, if
an optional remote sensor has been fitted in the rooms (one per indoor unit), the misadjustment is cancelled automatically
(not available in the FSGM RPK series).
If an indoor unit is defined by CSNET in Auto Cool/Heat mode, all the indoor units connected to the same outdoor Set-
Free FS (or to the same CH Box in Set-Free FX systems) will change to the Auto Cool/Heat mode. This means that, for
example if one of the indoor units was adjusted for heating at 17ºC and the outdoor Set-Free FS or Set-Free FX CH Box
changes to cooling mode, according to the calculation of CSNET, this indoor unit will begin to cool when it reaches 17°C.
To prevent this kind of situation from occurring, take care when programming the timer.
For all the indoor units connected to a single outdoor Set-Free FS or Set-Free FX CH Box, the starting time in the morning
for the first unit (see "Timer") should serve as the reference time and conditions for all the other units in the same system.
At night, the last indoor unit to change will be the reference point for all the other units of the system in question.
If a user selects a different mode with the individual remote control when the local mode is being used, it will later return
to the mode calculated by CSNET. Thus it is not recommended to use the mode selector of the remote controls during the
Auto Cool/Heat operation of CSNET in local mode. The temperature should only be regulated, if necessary, with the 
(up) or  (down) buttons. CSNET will then select and adjust the necessary (and possible) mode by outdoor unit (also in
the LCD screen of the individual remote control).
C A U T I O N
In case of configuring Auto Cool/Heat and Fan stop heating during thermo off functions, it should be ensured that only one input data
THM4 or RCS Sensor has been configured on both functions.
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TCGB0106 rev.0 - 12/2014
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