3WAY SYSTEM
Control Functions
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3. Compressor Control
3-1. Compressors Mounted in the Outdoor Units
[U-8MF2E8, U-10MF2E8, U-12MF2E8, U-14MF2E8, U-16MF2E8]
8 hp
10 hp
12 hp
14 hp
16 hp
Installed
compressor
Compressor 1
DC Inverter Rotary
Compressor 2
Constant speed Scroll
10HP
10HP
10HP
10HP
10HP
5 HP
5 HP
6 HP
–
–
hp = horsepower
3-2. Compressor Selection Rules
3-2-1. Priority Order of Inverter Compressor and Constant Speed Compressor
Priority order of inverter compressor is higher than that of constant speed compressor.
3-2-2. Priority Order of Inverter Compressors
The priority order of the inverter compressor with the least operating time is high.
3-2-3. Operating Compressors
All cooling mode
All the inverter compressors operate when the system starts.
The constant speed compressors operate according to those priority orders when the load of air conditioner
becomes large.
All heating mode or mixed cooling/heating operation
At least, one inverter compressor operates when the system starts.
The other compressors operate according to those priority orders when the load of air conditioner becomes large.
8 HP
DC Inverter
10 HP
DC Inverter
12 HP
DC Inverter
Constant speed 5HP
14 HP
DC Inverter
Constant speed 5HP
16 HP
DC Inverter
Constant speed 6HP
Top view
* However, when the inverter compressor stops because of protection control or forced stop, etc., a constant speed
compressor operates while the inverter compressor has stopped.
* The comparison is made among inverter compressors other than ones stopped because of protection control or
forced stop.
* Some inverter compressors might stop after the system starts when the load of the air conditioner becomes
very small and ambient temperature is 10°C or more.
Inverter Compressor
No backup status
Constant Speed Compressor
Shorter operating time
Longer operating time
Shorter operating time
Longer operating time
Priority order flow of all compressors
SM830226-00̲3WAY ECO-i SYSTEM.in4 4
SM830226-00̲3WAY ECO-i SYSTEM.in4 4
2013/02/13 11:52:23
2013/02/13 11:52:23
