Daikin FVXS25FV1B Service Manual page 47

Control Specification
3.3.2 Four Way Valve Switching
Outline During the heating operation current must be conducted and during cooling and defrosting
current must not be conducted. In order to eliminate the switching sound (as the four way valve
coil switches from ON to OFF) when the heating is stopped, the delay switch of the four way
valve must be carried out after the operation stopped.
Detail The OFF delay of four way valve
Energize the coil for 160 sec (25/35 class) or 150 sec (50 class) after unit operation is stopped.
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SiBE06-708
Function and Control