Controls At Mode Changing / Start-Up - Daikin FLKS25BAVMB Service Manual

Control Specification
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
ON Condition
OFF Condition
Outdoor temperature ≥ A°C → Control I
Outdoor temperature < A°C → Control II
Control I
Control II
RK(X)S25/35G2V1B9
RXS25/35J2V1B
RXS25K3V1B
RXS35K2V1B
RXS25/35L2V1B
RXS25/35L3V1B
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.
44
RK(X)S25/35E2V1B, RK(X)S25/35G2V1B
When the discharge pipe temperature is below 10°C, the inverter operation in open phase
starts.
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
ON condition
Discharge pipe temperature < B°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > C°C
Radiation fin temperature ≥ 90°C
ON condition
Discharge pipe temperature < D°C
Radiation fin temperature < 85°C
OFF condition
Discharge pipe temperature > E°C
Radiation fin temperature ≥ 90°C
A (°C)
7
–2.5
B (°C) C (°C) D (°C)
10 12 20
0 2 10
SiBE05-722EE
E (°C)
22
12
Functions and Control