Input Current Control - Daikin FTKN09NMVJU Service Manual

SiUS041501E
3.5

Input Current Control

Outline The microcomputer calculates the input current while the compressor is running, and sets the
frequency upper limit based on the input current.
In case of heat pump models, this control is the upper limit control of frequency and takes priority
over the lower limit control of four way valve operation compensation.
Detail
Frequency control in each zone
Stop zone
Dropping zone
Keep zone
Reset zone
A (A)
B (A)
C (A)
A (A)
B (A)
C (A)
A (A)
B (A)
C (A)
Limitation of current dropping and stop value according to the outdoor temperature
Function and Control
(A)
A
B
C
Input current
After 2.5 seconds in this zone, the compressor is stopped.
The upper limit of the compressor frequency is defined as operation frequency – 2 Hz.
After this, the output frequency is pulled down by 2 Hz every second until it reaches the keep
zone.
The present maximum frequency goes on.
Limit of the frequency is canceled.
RK(X)N series
RK(X)N09NMVJU
Cooling Heating
7.75 10
6.75 8.5
5.75 7.5
RKN18NMVJU
Cooling Heating
9.25 —
8.5 —
7.5 —
RK(X) series
RK(X)09NMVJU
Cooling Heating
12
6.75 8.5
5.75 7.5
The current drops when outdoor temperature becomes higher than a certain level (depending
on the model).
Compressor Stop
RK(X)N12NMVJU
Cooling Heating
8.5 10
7.5 8.5
6.5 7.5
RXN18NMVJU RK(X)N24NMVJU
Cooling Heating Cooling
13
10 9 12
9 8 11
RK(X)12NMVJU RK(X)18NMVJU
Cooling Heating Cooling
12
7.5 8.5 10
6.5 7.5 9
Control Specification
Stop Zone
Dropping Zone
Keep Zone
Reset Zone
(R14723)
Heating
18
14.5
13.5
RK(X)24NMVJU
Heating Cooling Heating
18 18
10.75 12
9.75 11
11.5
10.5
40