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SiENBE04-512A
Control Specification
Function and Control
51
3.2
Frequency Control
Outline
Frequency will be determined according to the difference between room and set temperature.
The function is explained as follows.
1. How to determine frequency.
2. Frequency command from an indoor unit. (The difference between a room temperature and
the temperature set by the remote control.)
3. Frequency command from an indoor unit.
4. Frequency initial setting.
5. PI control.
Detail
How to Determine Frequency
The compressor’s frequency will finally be determined by taking the following steps.
For Heat Pump 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, peak cutting, freeze-up protection, dew prevention, fin
thermistor temperature.
1.2 Limiting defrost control time
1.3 Forced cooling
1.4 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, peak cutting, freeze-up protection,
defrost.
3. Determine lower limit frequency
Set a maximum value as an lower limit frequency among the frequency lower limits of the
following functions:
Four way valve operating compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
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-up protection, dew prevention, fin thermistor temperature.
1.2 Indoor frequency command
Comm
a
nd fre
qu
ency
Limit frequency
S
kip control
Upper limit f
u
nction
Compre
ss
or protection f
u
nction
Lower limit f
u
nction
Fo
u
r-w
a
y v
a
lve oper
a
ting compen
sa
tion, etc. (
*
)
Initi
a
l fre
qu
ency
PI control
Defro
s
t control (
*
)
Drooping f
u
nction
Inp
u
t c
u
rrent control, etc.
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Tar
g
et frequency
Comm
a
nd fre
qu
ency X repe
a
t
s
when fre
qu
ency
b
ecome
s
lower
Fre
qu
ency ch
a
nge
s
b
y PI control < repe
a
t
s
when fre
qu
ency
b
ecome
s
lower
*
only for he
a
t p
u
mp model
(R2
83
1)
SiENBE04-512A.book Page 51 Friday, October 5, 2007 1:49 PM
Summary of Contents for ARKH20CVMB7
Page 1: ...SiENBE04 512A Service Manual Inverter Pair Wall Mounted Type C Series D Series ...
Page 17: ...List of Functions SiENBE04 512A 8 List of Functions ...
Page 37: ...Specifications SiENBE04 512A 28 Specifications ...
Page 73: ...Control Specification SiENBE04 512A 64 Function and Control ...
Page 103: ...Instruction SiENBE04 512A 94 System Configuration ...
Page 147: ...Check SiENBE04 512A 138 Service Diagnosis ...
Page 225: ...Outdoor Unit RK X H C ARK X H C R Y N C SiENBE04 512A 216 Removal Procedure ...
Page 229: ...Others SiENBE04 512A 220 Others ...
Page 241: ...Wiring Diagrams SiENBE04 512A 232 Appendix ...