Document Number:
38-9007-142
Revision:
02
S.A.C.
S.r.l .
Sede Legale: Via Varese, 90
Società a socio unico
I - 21013 Gallarate (VA)
Telefono: +39 0331 755111
Fax: +39 0331 784513
Codice Fiscale e R.I. Varese 08930800159
Capitale Sociale Euro 8.287.000
Partita IVA IT 01982420125
REA N. 221925 - Varese
5
Principle of functioning
Heating mode
When the unit is in heating mode, the system will regulate the heating capacity delivered to the room to
increase the room air temperature (RAT) to the set point (SPT) and to balance the thermal load of the
room to keep the set point temperature.
Cooling mode
When the unit is in cooling mode, the system will regulate the cooling capacity delivered to the room to
decrease the room air temperature (RAT) to the set point (SPT) and to balance the thermal load of the
room to keep the set point temperature.
Dehumiditication (dry) mode
When the unit is in dry mode, the system will operate according to the following table:
Note: when dry mode is active, the temperature of the room could decrease below the setpoint
temperature if the thermal load of the room is low.
Auto mode
When the unit is in auto mode (auto cooling or auto heating), the system will switch between heating
and cooling mode to maintain the room air temperature (RAT) to the set point temperature (SPT).
The system will switch between heating and cooling mode if one of the following conditions is met:
-
Cooling Heating if at least 3 minutes have passed since the compressor was stopped and
∆
T ≤ -3
-
Cooling Heating if at least 1 hour have passed since the compressor was stopped and
∆
T ≤ -1
-
Heating Cooling if at least 3 minutes have passed since the compressor was stopped and
∆
T ≥ 3
-
Heating Cooling if at least 1 hour have passed since the compressor was stopped and
∆
T ≥ 1
where:
∆
T = RAT – SPT
Fan mode
During fan mode, compressor is stopped and indoor fan will run at the selected speed.
RAT
DRY LEVEL
DESCRIPTION
≥ SPT + 2°C
0
Unit operates normally in cooling mode.
< SPT + 2°C
≥ SPT - 1°C
1
Unit operates with a fixed cooling demand.
Indoor fan switches between very low speed and
low speed every 30 seconds.
< SPT - 1°C
≥ 10°C
2
Unit cycles between a period of operation with a
fixed cooling demand (3 minutes) and a period of
non operation (9 minutes).
Indoor fan switches between very low speed and
low speed every 30 seconds.
< 10°C
DRY OFF
Unit is off.
