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Test Operation, Troubleshooting and Maintenance
4.3.3 Main board
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No. Name
1 Water ow switch
2 System 2 low-pressure switch for heating
3 System 1 high-pressure switch
4 System 1 low-pressure switch for heating
5 External passive contact switch
6 Preserved
7 Preserved
8 System 1 low-pressure switch for cooling
9 System 1 discharge temp. sensor
10 System 1 defrosting temp. sensor
11 Anti-freezing temp. sensor
12 Leaving water temp. sensor
13 Inlet water temp. sensor
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