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SM-18006
- Table of Contents -
4. Maintenance ..........................................................................................................................4-1
4.1 Maintenance of Water Source Unit .................................................................................................4-2
4.1.1 Removing Service Cover and Front Cover ............................................................................4-2
4.1.2 Attaching Service Cover and Front Cover .............................................................................4-3
4.1.3 Removing Upper Cover ..........................................................................................................4-4
4.1.4 Removing Rear Cover ............................................................................................................4-5
4.1.5 Removing Pipe Cover ...........................................................................................................4-6
4.1.6 Removing Side Cover ............................................................................................................4-7
4.1.7 Removing Electrical Box Cover ..............................................................................................4-9
4.1.8 Removing Electrical Box ........................................................................................................4-10
4.1.8.1 Removing Radiation Plate from Inverter PCB ..................................................................4-10
4.1.8.2 Removing Wiring and Disconnect Connectors .................................................................4-11
4.1.8.3 Removing Electrical Box ...................................................................................................4-13
4.1.9 Removing Compressor ..........................................................................................................4-14
4.1.10 Replacing Plate Heat Exchanger ...........................................................................................4-23
4.1.11 Replacing Refrigerant Oil .......................................................................................................4-25
4.1.11.1 Replacing Refrigerant Oil (No Clogging in Oil Return Pipe Assy) ..................................... 4-25
4.1.11.2 Replacing Refrigerant Oil (Clogging in Oil Return Pipe Assy)
and Replacing Oil Return Pipe Assy ................................................................................4-27
4.1.12 Removing Expansion Valve and Solenoid Valve Coils ...........................................................4-30
4.1.12.1 Removing Expansion Valve Coil (MV1,MV3,MV4, MVB) .................................................. 4-31
4.1.12.2 Removing Solenoid Valve Coil (SVA, SVB, SVC, SVG) ...................................................4-33
4.1.12.3 Removing Solenoid Valve Body (SVA, SVB, SVC, SVG) .................................................4-33
4.1.12.4 Removing Reversing Valve Coil (RVR1, RVR2) ...............................................................4-35
4.1.12.5 Removing Reversing Valve Body (RVR1, RVR2) .............................................................4-36
4.1.13 Removing Stop Valve .............................................................................................................4-38
4.1.14 Removing High Pressure Switch, High Pressure Sensor, Low Pressure Sensor
and Thermistors .....................................................................................................................4-39
4.1.14.1 Removing High Pressure Switch (PSH1 and PSH2) ........................................................4-41
4.1.14.2 Removing High Pressure Sensor (Pd) and Low Pressure Sensor (Ps) ............................ 4-41
4.1.14.3 Removing Thermistor for Refrigerant Piping (Te, Tg, Tchg, Tsc) ......................................4-42
4.1.14.4 Removing Thermistor for Entering Water Temperature (Ta) .............................................4-43
4.1.14.5 Removing Thermistor for Upper Side of
Compressor (Discharge Gas) Temperature (Td1 and Td2) ..............................................4-44
4.1.14.6 Removing Thermistor for Electrical Box Temperature (Ts) ................................................4-45
4.1.15 Removing Other Electrical Components ................................................................................4-46
4.1.15.1 Removing Control PCB and Electrical Components inside Electrical Box ........................4-46
4.1.15.2 Removing Inverter PCB ....................................................................................................4-59
4.1.15.3 Removing Electrical Box ...................................................................................................4-60
4.1.15.4 Removing Cooling Fan .....................................................................................................4-62
4.1.16 Removing Components for Change-Over Box.......................................................................4-64
4.1.16.1 Removing Service Cover for Electrical Box and Electronic Expansion Valve ................... 4-64
4.1.16.2 Removing Electrical Components ..................................................................................... 4-66
4.1.16.3 Removing Electric Expansion Valve Coil ..........................................................................4-69
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