Danfoss DHP-A Service Instructions Manual page 21

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Figure 12. Top panel and side panels
8. Slacken off the screws that hold the rear panel and remove it.
9. Disconnect the electrical connectors at the exchange valve, circulation pump and electrical auxiliary heater.
10. Disconnect the cables for the following sensors at the electrical panel:
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Supply line (301, 302)
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Hot water (311, 312)
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Top sensor (325, 326)
11. Unscrew the electrical panel's screws.
12. Turn the electrical panel through 180 degrees and place it in front of the heat pump.
Figure 13. Electrical panel
13. Disconnect the T-pipe connector from the return line under the heater, see figure below.
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Service instructions VMGFC302 – 19