Daikin Super Multi NX FLKS25BAVMB, Service Manual, Page: 54 / 144

Control Specification SiBE05-722EE
44 Functions and Control
3.3 Controls at Mode Changing / Start-up
3.3.1 Preheating Control
Outline The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, the radiation fin temperature, and the preheating command from
the indoor unit.
Detail
„
RK(X)S25/35E2V1B, RK(X)S25/35G2V1B
ON Condition
Š
When the discharge pipe temperature is below 10°C, the inverter operation in open phase
starts.
OFF Condition
Š
When the discharge pipe temperature is higher than 12°C, the inverter operation in open
phase stops.
„
RK(X)S25/35G2V1B9, RXS25/35J2V1B, RXS25K3V1B, RXS35K2V1B, RXS25/35L2V1B,
RXS25/35L3V1B
Outdoor temperature
≥
A °C
→
Control I
Outdoor temperature < A °C
→
Control II
Control I
Š
ON condition
Discharge pipe temperature < B °C
Radiation fin temperature < 85°C
Š
OFF condition
Discharge pipe temperature > C °C
Radiation fin temperature
≥
90°C
Control II
Š
ON condition
Discharge pipe temperature < D °C
Radiation fin temperature < 85°C
Š
OFF condition
Discharge pipe temperature > E °C
Radiation fin temperature
≥
90°C
3.3.2 Four Way Valve Switching
Outline The four way valve coil is energized / not energized depending on the operation mode.
(Heating: ON, Cooling / Dry / Defrost: OFF) In order to eliminate the switching sound as the four
way valve coil switches from ON to OFF when the heating is stopped, the OFF delay switch of
the four way valve is carried out.
Detail OFF delay switch of four way valve
The four way valve coil is energized for 160 seconds after the operation is stopped.
A (°C) B (°C) C (°C) D (°C) E (°C)
RK(X)S25/35G2V1B9
RXS25/35J2V1B
7 10 12 20 22
RXS25K3V1B
RXS35K2V1B
RXS25/35L2V1B
RXS25/35L3V1B
–2.5 0 2 10 12