![background image](http://html.mh-extra.com/html/daikin/2mks40fv1b/2mks40fv1b_service-manual_501074055.webp)
Control Specification
SiEN12-710A
44
Function and Control
For Cooling Only Model
1. Determine command frequency
$
Command frequency will be determined in the following order of priority.
1.1 Limiting frequency by drooping function
$
Input current, discharge pipes, freeze prevention, dew prevention, fin thermistor
temperature.
1.2 Indoor frequency command
2. Determine upper limit frequency
$
Set a minimum value as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipes, freeze prevention, dew prevention,
fin thermistor temperature.
3. Determine lower limit frequency
$
Set a maximum value as an lower limit frequency among the frequency lower limits of the
following functions:
Pressure difference upkeep.
4. Determine prohibited frequency
$
There is a certain prohibited frequency such as a power supply frequency.
Indoor Frequency Command (
Δ
D signal)
The difference between a room temperature and the temperature set by the remote control will
be taken as the “
Δ
D signal” and is used for frequency command.
∗
Th OFF = Thermostat OFF
Indoor Unit Capacity (S value)
The capacity of the indoor unit is a “S” value and is used for frequency command.
Frequency Initial Setting
< Outline >
When starting the compressor, or when conditions are varied due to the change of the operating
room, the frequency must be initialized according to the total of a maximum
Δ
D value of each
room and a total value of Q (
Σ
Q) of the operating room (the room in which the thermostat is set
to ON).
Q value: Indoor unit output determined from indoor unit volume, air flow rate and other factors.
PI Control (Determine Frequency Up/Down by
Δ
D Signal)
1. P control
Calculate a total of the
Δ
D value in each sampling time (20 seconds), and adjust the
frequency according to its difference from the frequency previously calculated.
2. I control
If the operating frequency is not change more than a certain fixed time, adjust the frequency
up and down according to the
ΣΔ
D value, obtaining the fixed
ΣΔ
D value.
When the
ΣΔ
D value is small...lower the frequency.
When the
ΣΔ
D value is large...increase the frequency.
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
0
∗
Th
OFF
2.0
4
4.0
8
6.0
C
0.5
1
2.5
5
4.5
9
6.5
D
1.0
2
3.0
6
5.0
A
7.0
E
1.5
3
3.5
7
5.5
B
7.5
F
ex.)
Capacity
S value
2.5 kW
25
3.5 kW
35
Summary of Contents for 2MKS40FV1B
Page 11: ...Introduction SiEN12 710A x ...
Page 12: ...SiEN12 710A List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 17: ...Heat Pump SiEN12 710A 6 List of Functions ...
Page 25: ...Heat Pump SiEN12 710A 14 Specifications ...
Page 111: ...Instruction SiEN12 710A 100 Operation Manual ...
Page 199: ...Wiring Diagrams SiEN12 710A 188 Appendix ...
Page 203: ...SiEN12 710A iv Index ...