Hitachi PC-ARF Technical Catalogue page 578

6 Building air conditioning controls
CSNET Manager LT/XT
Description of the operation mode
In the automatic (Auto) Cool/Heat mode requested by the indoor units, CSNET will check first whether the cooling circuit to
which the unit is connected is 2 tube or 3 tube before deciding to change the operating mode.
Then, CSNET WEB calculates the difference to decide the best operation mode at that moment.
The temperature difference is calculated as follows:
• 2 Tubes:
CSNET WEB takes into account all the indoor units which depend on the same cooling circuit. CSNET then calculates in
the following way:
Temp diff. (1) = Air inlet temperature (1) - corrected temperature (1)
Temp diff. (2) = Air inlet temperature (2) - corrected temperature (2)
....
Temp diff. (n) = Air inlet temperature (n) - corrected temperature (n)
Temp diff. = (Temp diff. (1) + Temp diff. (2) + ... + Temp diff. (n)) / n
Where:
Air inlet temp (i) = Air inlet temperature selected (consult the section
Corrected temp (i) = Temperature shown in the remote control or selected by CSNET (if the indoor unit does not have a
remote control) (see the section
Temp diff. (i) = Temperature difference between the air inlet temperature and the setting temperature of the indoor unit
number "i".
n = Number of indoor units connected to the same outdoor unit.
Temp diff. = Average of the temperature differences of all the indoor units.
• 3 Tubes
CSNET will only make this calculation for the indoor units in Auto mode. Thus CSNET makes independent calculations for
each indoor unit:
Temp diff. = Air inlet temp. - Corrected temp.
Where:
Air inlet temp = Air inlet temperature selected (consult the section
Corrected temp = Temperature shown in the remote control or selected by CSNET WEB (if the indoor unit does not have
a remote control) (see the section
Temp diff. = Temperature difference between the air inlet temperature and the setting temperature of the indoor unit.
After calculating the operation mode which the units should use, and taking into account the conditions established as
indicated in "Description of
N O T E
If more than one indoor unit is connected to the same CH Box, CSNET treats this box as an outdoor 2-tube unit.
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TCGB0106 rev.0 - 12/2014
"Description of parameters"
"Description of parameters"
parameters", CSNET will send the order to all the affected units.
"Description of parameters"
for more information).
"Description of parameters"
for more information).
for more information).
for more information).