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. Refrigerant Flow for Each Operational Mode .......................................................................................................... 13
a. 38VMA072, 096, 120HDS ................................................................................................................................ 13
b. 38VMA144HDS ................................................................................................................................................ 17
III. Function and Control ........................................................................................................................................................ 21
1. Operation Mode ...................................................................................................................................................... 21
2. Basic Control ............................................................................................................................................................ 22
a. Normal Operation ............................................................................................................................................ 22
b. Capacity Calculation ........................................................................................................................................ 22
c. Compressor Control ......................................................................................................................................... 26
Compressor Operating Priority ................................................................................................................................ 26
3. Electronic Expansion Valve Control ......................................................................................................................... 28
a. Cooling Electronic Expansion Valve Control .................................................................................................... 28
b. Heating Electronic Expansion Valve Control .................................................................................................... 28
4. Fan Control .............................................................................................................................................................. 29
a. Cooling Fan Control ......................................................................................................................................... 30
b. Fan Control Process ......................................................................................................................................... 30
c. 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. Discharge Pipe Protection Control ........................................................................................................................... 35
4. Inverter Protection Control ...................................................................................................................................... 36
a. Inverter Overcurrent Protection Control ......................................................................................................... 36
b. Inverter Fin Temperature Control .................................................................................................................... 36
5. Other Control ........................................................................................................................................................... 37
a. Outdoor Unit Rotation ..................................................................................................................................... 37
b. Sequence of Outdoor Unit Rotation ................................................................................................................ 37
c. Timing of Outdoor Unit Rotation ..................................................................................................................... 37
6. Cooling Operation Prohibition ................................................................................................................................. 37
7. Heating Operation Prohibition ................................................................................................................................ 37
VI. Field Settings..................................................................................................................................................................... 38
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