Specifications
149
(2) Cooling operation
(a) Cooling
1) If the sum of selected and required frequencies is not larger than the maximum frequency, the required frequencies listed
in the following table apply. If the sum of required frequencies is larger than the maximum frequency, the required
frequencies divided proportionally apply.
Frequency bands for indoor unit models
Notes(1) Frequency during cooling is 45 Hz.
(2) The required frequency is counted in the unit of 5 Hz and the selected frequency in the unit of 1 Hz.
2) This indoor unit electronic expansion valve (EEV) controls opening of each indoor unit corresponding to decision frequency.
Also, the thermostat is sampled in pitch of 20 second.
22 model 28 model 36 model 45 model 56 model 71 model
90 model
(1)
112 model 140 model
10 ~ 15 10 ~ 20 10 ~ 25 10 ~ 25 15 ~ 30 15 ~ 40 15 ~ 50 35 ~ 60 35 ~ 70
5 ~ 15 5 ~ 20 5 ~ 25 5~ 25 5 ~ 30 5 ~ 40 5 ~ 50 5 ~ 60 5 ~ 70
(b) Cooling thermostat off
(i) When all thermostata of indoor unit in a module are turned off, the indoor units operate in the cooling thermostat off
mode per outdoor unit module.
(ii) When the decision frequency to indoor units is less than 5Hz, or when the demand frequency reaches to the OFF area
according to fuzzy operation, the indoor units will select the cooling thermostat of mode.
2.4.2 Indoor unit
(1) Automatic operation
Once the [Auto] mode is selected by remote control, the operating mode is automatically selected according to the setting temperature
and the intake air temperature of the indoor unit and cooling or heating operation is performed. The determination is performed
when the thermostat has been in the OFF mode for 10 minutes or more continuously.
Notes (1) No determination is made if the mode setting is cooling, dehumidify or heating
and the cooling and heating thermostats have been in the off mode for 10 minutes
in the automatic operation mode.
(2) If set to automatic operation mode when the intake temperature is within ± 2 in
relation to the setting temperature, the same operation as the previous automatic
operation will be performed. (Note that it will be the heating mode when first
turned on after the power has been turned off.)
-2 +2
Heating operation
Cooling operation
Room temperature setting
Room temperature (detected atTh
I
-A) (deg.)
Model (Indoor)
Category
All series
Required frequency (Hz)
Selected frequency (Hz)
(3) Dehumidifying (Thermal dry)
•
This cooling operation is mainly for dehumidifying, with which the compressor, indoor and outdoor fans are operated in the patterns as
listed in the following table and in accordance with operation blocks switched with the room temperature sensor. The operation blocks are
selected by checking the return air temperature at 4-minute intervals. Respective functional items are operated in each operation block as
shown by the following table.
Compressor Sum of frequencies on combined indoor units
Indoor unit electronic expansion valve
Frequency adaptation
Indoor unit fan Me Lo Lo Lo↔OFF
Outdoor unit fan
Operation Operation Operation Stop
ABCD
Operation block
Item
Indoor unit frequency (Hz)
22 model 10 10 10 0
28 model 15 10 10 0
36 model 20 15 10 0
45 model 20 15 10 0
56 model 25 15 15 0
71 model 30 20 15 0
90 model 40 25 15 0
112 model 50 40 35 0
140 model 60 45 35 0
Operation block
DCBA
Low -2 ▲ +2 High
Room temperature
setting point
• Indoor unit fan will be operated in
D block as shown below.
Temperature check
20 sec.
4 min.
Temperature check
Lo
OFF