Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1035

(2) 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.
Heating operation
-2
Room temperature (detected atTh
(3) Operations of major functional items under each operation mode
Operation mode
Thermostat ON Thermostat OFF
Functional item
Remote controller
Indoor unit fan
command
Indoor unit electronic
According to deter-
mined frequency
expansion valve
Compressor
Outdoor unit fan
Drain motor
Solenoid valve (20VU)
Solenoid valve (20 VF)
Four-way valve (20 SL,S)
Solenoid valve (SV1, L,S)
Notes(1) : ON, : OFF, / : ON or OFF
(2) Cooling and heating also include auto mode.
(3) Off if jumper wire (J3) is short circulated (factory setting) and open.
(4) 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
Model (Indoor)
Category
22 model 28 model 36 model 45 model 56 model 71 model 90 model 112 model 140 model
Required frequency (Hz)
10 ~ 15
Selected frequency (Hz)
5 ~ 15
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.
(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 ndoor units will select the cooling thermostat of mode.
Cooling operation
+2
Room temperature setting
-A) (deg.)
I
Cooling
fan
Remote controller Remote controller
command command
Fully closed Fully closed
/
/
10 ~ 20 10 ~ 25 10 ~ 25
5 ~ 20 5 ~ 25 5~ 25
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 ˚C 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.)
Heating
Thermostat ON Thermostat OFF
Remote controller Intermittent
command operation
According to deter-
Fully closed
mined frequency
/
/
Individual definitions
Individual definitions
All series
15 ~ 30 15 ~ 40 15 ~ 50 35 ~ 60
5 ~ 30 5 ~ 40 5 ~ 50
FDC-HKXR
Dehumidify
Defrost
→
According to deter-
Fully open
mined frequency
→
35 ~ 70
5 ~ 60 5 ~ 70
/
/
/
/
/
1033