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Main Functions
SiE12-411
70
Function and Control
1. Main Functions
Note:
See the list of functions for the functions applicable to different models.
1.1
Frequency Principle
Main Control
Parameters
The compressor is frequency-controlled during normal operation. The target frequency is set by
the following 2 parameters coming from the operating indoor unit:
"
The load condition of the operating indoor unit
"
The difference between the room temperature and the set temperature
Additional
Control
Parameters
The target frequency is adapted by additional parameters in the following cases:
"
Frequency restrictions
"
Initial settings
"
Forced cooling / heating operation
Inverter Principle
To regulate the capacity, a frequency control is needed. The inverter makes it possible to vary
the rotation speed of the compressor. The following table explains the conversion principle:
Drawing of
Inverter
The following drawing shows a schematic view of the inverter principle:
Phase
Description
1
The supplied AC power source is converted into the DC power source for the present.
2
The DC power source is reconverted into the three phase AC power source with variable
frequency.
"
When the frequency increases, the rotation speed of the compressor increases resulting
in an increased refrigerant circulation. This leads to a higher amount of the heat
exchange per unit.
"
When the frequency decreases, the rotation speed of the compressor decreases
resulting in a decreased refrigerant circulation. This leads to a lower amount of the heat
exchange per unit.
Refriger
a
nt circ
u
l
a
tion r
a
te (high)
high f
low f
fre
q
=v
a
ri
ab
le
Refriger
a
nt circ
u
l
a
tion r
a
te (low)
high
s
peed
low
s
peed
(R2
8
12)
Amo
u
nt of he
a
t
exch
a
nged
a
ir (
s
m
a
ll)
Amo
u
nt of he
a
t
exch
a
nged
a
ir (l
a
rge)
fre
q
=
con
s
t
a
nt
50 Hz
50 Hz
60 Hz
60 Hz
AC
po
w
e
r
DC
po
w
e
r
c
a
p
a
city=
v
a
ri
ab
le
Amo
u
nt of he
a
t
exch
a
nged
a
ir (l
a
rge)
Amo
u
nt of he
a
t
exch
a
nged
a
ir (
s
m
a
ll)
Summary of Contents for Super Multi NX C-Series
Page 6: ...SiE12 411 Table of Contents v Index i Drawings Flow Charts v...
Page 7: ...SiE12 411 vi Table of Contents...
Page 67: ...Specifications SiE12 411 56 Specifications...
Page 171: ...Instruction SiE12 411 160 System Configuration...
Page 225: ...Check SiE12 411 214 Service Diagnosis...
Page 295: ...SiE12 411 iv Index...