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3-1. Compressors Mounted in the Outdoor Units
Constant
speed
5 hp
–––
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72 96
DC Inverter DC Inverter
Capacity
Rotary
hp = horsepower
* Immediately after installation, all compressors have an operating time of zero. In this case, the compressors
start in the following sequence: Inverter compressor > Constant-speed compressor 1 > Constant-speed com-
pressor 2.
Examples of accumulated operating time: ODU=Outdoor Unit
Compressor Selection Sequence in Cooling Mode:
ODU 1
100 hrs.
150 hrs.
70 hrs.
160 hrs.
4th
[CHDX07263, CHDX09663]
INV
Compressor 2
Compressor 1
Type 96
INV
Compressor 1
Type 72
3-2. Compressor Selection Rules
In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously. All the
inverter compressors will stop at a time when the outdoor is stopped accordingly. Constant-speed compressors
run in order of the shortest amount of operating time. In heating mode, the inverter compressor with the shortest
amount of operating time runs at first followed by the compressors in order of the shortest amount of operating
time including inverter units.
Suppose the following tentative system.
All the inverter compressors are firstly selected simultaneously.
ODU 2
Comp 1
Comp 2
ODU 1
ODU 2
Comp 1
Comp 2
1st
3rd
1st
Compressor Selection Sequence in Heating Mode:
First, the inverter compressor with the shortest amount of operating time is selected. And then, the remained
other compressors are selected and start in the order of shortest amount of operating time
.
3rd
4th 2nd
Installed
compressor
Compressor 1
Compressor 2
1st
ODU 1
ODU 2
Comp 1
Comp 2
1 - 4
3. Compressor Control
W-2WAY ECO-i SYSTEM
Control Functions