Table of Contents
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A. Technical Data ................................................................................................................................................................... 5
A.1. General Description ............................................................................................................................................................ 5
A.2. General Specifications ........................................................................................................................................................ 6
A.2.1. 2-pipe Systems ........................................................................................................................................................... 6
A.2.2. 4-Pipe Systems............................................................................................................................................................ 7
A.3. Coil Data ............................................................................................................................................................................. 7
A.4. Sound Power Data .............................................................................................................................................................. 8
A.5. Dimension Drawings ........................................................................................................................................................... 9
A.6. Valve Information (Optional)............................................................................................................................................ 11
A.6.1. On/Off Ball Valve Models ......................................................................................................................................... 11
A.6.2. Modulating Valve Models ......................................................................................................................................... 12
B. Installation ....................................................................................................................................................................... 13
B.1. Safety Precautions ............................................................................................................................................................ 13
B.2. Location ............................................................................................................................................................................ 14
B.3. Installation Procedures ..................................................................................................................................................... 14
B.4. Pipes Connection .............................................................................................................................................................. 16
B.5. Electrical Connection ........................................................................................................................................................ 17
C. Maintenance .................................................................................................................................................................... 19
C.1. General Maintenance ....................................................................................................................................................... 19
C.2. Regular Maintenance ....................................................................................................................................................... 19
C.3. Filter Cleaning ................................................................................................................................................................... 19
C.4. Fan Motor Assembly Maintenance ................................................................................................................................... 19
D. Control Specifications: Complete Function PCB: AC-S1 .................................................................................................... 20
D.1. I/O Port Definitions........................................................................................................................................................... 20
D.2. Wiring Diagram ................................................................................................................................................................ 21
D.2.1. Complete Function PCB: AC-S1 ................................................................................................................................ 21
D.3. Configuration Settings ...................................................................................................................................................... 22
D.3.1. Fan Coil Unit ON/OFF ............................................................................................................................................... 23
D.3.2. Auto Restart ............................................................................................................................................................. 23
D.4. Control Logics for 2-Pipe System ...................................................................................................................................... 24
D.4.1. With Valve Configuration ......................................................................................................................................... 24
D.4.2. Without Valve Configuration .................................................................................................................................... 26
D.5. Control Logics for 4-Pipe System ...................................................................................................................................... 27
D.6. Sleep Mode ....................................................................................................................................................................... 29
D.7. Auto Fan Speed ................................................................................................................................................................ 29
D.8. Buzzer ............................................................................................................................................................................... 30
D.9. Auto Restart ..................................................................................................................................................................... 30
D.10. On/Off Switch on LED Display Panel............................................................................................................................... 30
D.11. Electric Heater Safety Switch .......................................................................................................................................... 30
D.12. Low Temperature Protection of Indoor Coil in Winter ................................................................................................... 30
D.13. LED Display and Error Description .................................................................................................................................. 31
D.14. LED Display on Master/Slave Connection....................................................................................................................... 32
Table of Contents
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SK2019 EU FDHD-V/P-AC-001
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