Table of Contents
I.
General Information ........................................................................................................................................................... 4
1.
Model Number Nomenclature .................................................................................................................................. 4
2.
Capacity Range .......................................................................................................................................................... 5
3.
Outdoor Units Lineup ................................................................................................................................................ 6
4.
Indoor Units Lineup ................................................................................................................................................... 6
5.
Combination Table ..................................................................................................................................................... 7
6.
Refrigerant Charge Calculation .................................................................................................................................. 7
II. Refrigerant Circuit............................................................................................................................................................... 8
1.
Refrigerant Circuit Diagram ....................................................................................................................................... 8
2.
Functional Parts Layout ........................................................................................................................................... 11
3.
38VMA072, 096, 120HDS ................................................................................................................................ 13
38VMA144HDS ................................................................................................................................................ 17
III. Function and Control ........................................................................................................................................................ 21
1.
Operation Mode ...................................................................................................................................................... 21
2.
Basic Control ............................................................................................................................................................ 22
Normal Operation ............................................................................................................................................ 22
Capacity Calculation ........................................................................................................................................ 22
Compressor Control ......................................................................................................................................... 26
Compressor Operating Priority ................................................................................................................................ 26
3.
4.
Fan Control .............................................................................................................................................................. 29
Cooling Fan Control ......................................................................................................................................... 30
Fan Control Process ......................................................................................................................................... 30
Heating Fan Control ......................................................................................................................................... 30
IV. Special Control .................................................................................................................................................................. 31
1.
Startup Control ........................................................................................................................................................ 31
2.
Oil Return Operation ............................................................................................................................................... 31
3.
Overload Control ..................................................................................................................................................... 33
4.
Stopping Operation ................................................................................................................................................. 33
V. Protection Control ............................................................................................................................................................ 35
1.
High Pressure Protection Control ............................................................................................................................ 35
2.
Low Pressure Protection Control ............................................................................................................................. 35
3.
4.
Inverter Protection Control ...................................................................................................................................... 36
5.
Other Control ........................................................................................................................................................... 37
Outdoor Unit Rotation ..................................................................................................................................... 37
6.
Cooling Operation Prohibition ................................................................................................................................. 37
7.
Heating Operation Prohibition ................................................................................................................................ 37
VI. Field Settings..................................................................................................................................................................... 38
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