Outdoor Unit; Way Valve Control; Operation, Stop And Thermostat Control - Daikin Skyair FHC35K Service Manual

Si-71A
5.2

Outdoor Unit

Note: Following functions are for R(Y)71~140K only. Please refer "Split G series" manual for smaller size outdoor
units.
5.2.1

4-way Valve Control

4-way valves conduct power when heating. Changeover switching is carried out only during operation.
4-way valve ON : During heating except when defrosting
4-way valve OFF : During cooling, program dry and defrosting
5.2.2

Operation, Stop and Thermostat Control

Thermostat Control Basic thermostat ON/OFF operations.......
Thermostat turns ON when ∆ Tr is 1°C.
Thermostat turns OFF when ∆ Tr is 0°C.
Initial operation 2.5 min Defrosting Forced operation
→ Room temperature control prevents thermostat from turning OFF.
∗ Regarding ∆ Tr
In cooling operation
∆ Tr = Indoor unit suction air temperature (Tr) - Temperature set by remote controller
In heating operation
∆ Tr = Temperature set by remote controller - Tr
Compressor
Shutdown
Operation
„ In heating operation, the 4-way valve is energized.
„ In heating operation of heat-pump units and when the thermostat is OFF in cooling-only units due to the
Explanation of Function Operation
room temperature level, the compressor stops 5 seconds after the motorized valve closes.
Function Details
65