3WAY VRF SYSTEM
Control Functions
1 - 4
1
2
3
4
5
6
7
8
9
2. Selecting Outdoor Unit for Operation
3. Compressor Control
3-1. Compressors Mounted in the Outdoor Units
3-2. Compressor Selection Rules
Placement of compressor seen from the top
* The inverter compressor is operated according to the load and does not operate beyond outdoor unit capacity.
3-2-1. Priority order of compressors
A.
A
B
C
D
Decide first priority order of compressor in each outdoor unit.
B. Priority order of compressor trip counter = 0 is higher than that of compressor trip counter = 1.
C. Inverter compressor: Shorter operating time > Longer operating time
D. Compressor that “outdoor unit small address”
installed in outdoor unit
Compressor that “outdoor unit large address”
installed in outdoor unit
First priority order of inverter compressor in each outdoor unit > Other inverter compressor
Compressor trip counter =0 > Compressor trip counter =1
Shorter operating time > Longer operating time
“Outdoor unit small address”
installed in outdoor unit
“Outdoor unit large address”
installed in outdoor unit
>
>
*1
*1 Select first priority order of compressor in each outdoor unit by following method.
The compressor that has no trip counter, shorter operating time and smaller number of compressor will be
taken first priority.
First priority order of inverter compressor in each outdoor unit > Other inverter compressor
2WAY VRF SYSTEM
Control Functions
Type of outdoor unit
1st compressor
2nd compressor
Type 120, 144
2nd compressor
1st compressor
Front side
Inverter compressor
(High pressure rotary)
Inverter compressor
(High pressure rotary)
4.8
72 96 120 144
unit : kW
7.9 4.5
4.5
5.6
5.6
Compressor trip counter =0 > Compressor trip counter =1
Shorter operating time > Longer operating time
1st compressor > 2nd compressor
Priority order flow of all compressors
Priority order flow of each outdoor unit
Type 72, 96
Front side
1st compressor
2-3. Outdoor Unit Stop Rules
2-3-1. Stopping of all outdoor units
When all outdoor units must stop, the units stop at the same time.
2-3-2. Stopping of individual outdoor units according to load of air-conditioning
● All cooling mode
Outdoor air temperature ≥ 113°F (45°C): All outdoor units will be operated. However, there is the outdoor unit
which has the stopped compressor according to load of air-conditioning.
69.8°F (21°C) < outdoor air temperature < 113°F (45°C): the outdoor unit which has the compressor with the
shortest amount of operating time continues to run and rest of the outdoor units may be stopped according to
load air-conditioning.
The outdoor unit which has any compressors without operation may be stopped.
Outdoor air temperature ≤ 69.8°F (21°C): The outdoor unit which has the compressor with the shortest
amount of operating time continues to run and rest of the outdoor units may be stopped according to load air-
conditioning.
There is the outdoor unit which has only the operating compressor or uses only the heat exchanger with the
stopped compressor according to some conditions.
● All heating mode
The outdoor unit which has the compressor with the shortest amount of operating time continues to run and rest
of the outdoor units may be stopped according to load air-conditioning.
● Mixed cooling/heating
The outdoor unit which has the compressor with the shortest amount of operating time continues to run and rest
of the outdoor units may be stopped according to load air-conditioning.
There is the outdoor unit which has only the operating compressor or uses only the heat exchanger with the
compressor stopped according to some conditions.
SM830246-00_北米向け3WAY_VRF.indb 4 15/12/17 11:54:22
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