Daikin FTXN25L Service Manual page 33

Algorithm & Control
Model
RXN25/35L
ARXN25/35L
RXN50/60L
ARXN50/60L
RXB50/60A
RXB50/60B
RXN50/60M
RXC50/60A
RXN25/35MV1
RXN25/35MV1B
RXN25/35MV1B9
ARXN25/35MV1B
RXN25/35N
ARXN25/35MV1B7
ARXN25/35MV16
ARXN25/35N
RXK25/35AV1B
RXC25/35A
2.16.2 Command Rotation
Cut in upon termination of Starting Control.
Achieve capacity control by controlling the compressor rotation based on:
• Temperature difference between set and room temperature, ∆T.
• Limit Rotation.
• Defrost control.
2.16.3 Fuzzy Control
Based on temperature difference, ∆T, current fan speed setting & current indoor operating mode at every 30
seconds interval.
Temperature Difference
Condition 1
∆T
∆T = T - T
t room set
Use to set target for compressor frequency change
Compressor frequency is increased or decreased
25
a Hz
(Time, s) (Time, s)
38 (60) 52 (120)
35 (60) 55 (120)
55 (120) 70 (200)
40 (180) 54 (420)
40 (180) 54 (420)
(Applicable for ARXN/RXN50/60L)
Condition 2
d∆T
d∆T = ∆T
t t
b Hz c Hz
(Time, s)
66 (120)
75 (360)
85 (470)
72 (180)
72 (180)
- ∆T
t-1
d Hz Max Hz
(Time, s) (Time, s)
80 (120) 94 (120)
- -
- -
90 (120) -
90 (120) -