Mitsubishi SCM80ZA Manual page 32

(8) Determining the operating mode
The cooling and heating operating modes are the remote control switch mode that have been previously determined.
If a mode differing from these is selected after this, the selected mode will appear in the display of the remote control, but only the
fan will operate.
First operation
Example
Selected Mode Remote Control Display
1 Cooling
Cooling
2
Cooling Cooling
3
Heating Heating
4
Heating Heating
Example of operating pattern
Cooling
switch
A unit
ON
Heating
B unit switch
ON
Operation Operation
(9) Control and protection functions
(a) Control during start of compressor operation
1) Soft start
The inverter starts from 4 Hz when starting from the stop mode to control the starting current.
2) Start of protection for compressor
When the inverter decision frequency is 34 Hz or more, compressor protection starts.
1 Start of protection I (When the unit is started after 6 hours or more have elapsed since the last compressor stop.)
After the compressor has been started, the frequency of the outdoor unit is maintained at a maximum of 60 Hz for 5
minutes, after which transition is made to the decision frequency.
2 Start of protection II (Other than item 1 )
After the compressor has been started, the frequency of the outdoor unit is maintained at 48 Hz for 1 minute and 45
seconds, after which transition is made to the decision frequency.
3 Start of protection III (The first time after the power is turned on and when starting when the total power-on time is
less than 6 hours.)
After the compressor has been started, it is operated at 30 Hz for 1 minute. Then for the next 10 minutes it increases
at a rate of 2 Hz every 30 seconds to the upper limit frequency of the outdoor unit. For the next 4 minutes, the
increase is 2 Hz every 15 seconds.
4 The 4-way diverter valve protection (When the unit is started under the decision frequency of less than 34Hz). The
unit is operated for 30 seconds under the outdoor unit's frequency of 34Hz and then it is operated in accordance with
the decision frequency.
3) Delay of compressor start
If the compressor (inverter) is stopped by the operation of the cooling or heating thermostat, the operation switch on the
remote controller or an abnormality, it cannot be restarted for 3 minutes.
However, turning on the power disables the 3-minute timer.
(b) Heating overload protection control
When the outdoor units are operating at a frequency other than 0 Hz and the outdoor air temperature is 12°C or more for 30
continuous seconds, the outdoor fan speed is reduced by one step to perform the current safe control. However, when one unit
is operating, the outdoor frequency is forced to 30 Hz. Recovery is when the outdoor air temperature is 10°C or less.
(c) Cooling overload protection control
When the outdoor units are operating at a frequency other than 0 Hz and the outdoor air temperature is 39°C or more for 3
continuous minutes, the fan speed of the outdoor unit is increased 1 speed and the current safe control operates. Recovery is
when the outdoor air temperature is 38°C or less.
82
Second operation
Operation Selected Mode Remote Control Display
Cooling Heating Heating
Cooling Fan
Heating Cooling Cooling
Heating Fan
Cooling
Cooling
Fan
switch
ON
Operation Operation
Notes
Operation
Fan (1)
• Different mode
Fan Fan
is only fan
Fan
operation.
Fan Fan
Heating
Fan Heating
switch
ON
Heating
Cooling
switch
ON
Operation
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Note (1) If the display shows heat-
ing and the opera-tion is
fan, Hot Keep will op-
erate.
Heating
Note (1) [ ] indicates correct operation.