OPTIONAL ACCESSORIES
12-2
Revision 0
Service Manual - KXL DCI
12.1.3
Target Frequency Setting
12.1.3.1 Target Frequency Setting for DCI 50/60
The compressor target frequency is a function of the NLOAD number sent from the indoor
controller and the outdoor air temperature.
Basic Target Frequency Setting:
NLOAD Target
Frequency
127
Maximum Frequency
10<NLOAD<127
Interpolated value between minimum and maximum
frequency
10
Minimum frequency
0
Compressor is stopped
Target frequency limits as a function of outdoor air temperature (OAT):
OAT Range
Cooling Mode limits
Heating Mode limits
OAT < 6
No limit
6
≤
OAT < 15
MaxFreqAsOAT1H
15
≤
OAT < 28
MaxFreqAsOATC
28
≤
OAT
No limit
MaxFreqAsOAT2H
12.1.3.2 Target Frequency Setting for DCI 72/80
The compressor Target Speed is calculated according to the following formula:
⎥⎦
⎤
⎢⎣
⎡
⋅
=
127
,
max
arg
ODUNload
MaxSpeed
MinSpeed
Speed
et
T
load
MaxSpeed
MinSpeed
,
are defined as following:
When the unit is in the cool mode,
Hz
MaxSpeedC
Hz
MinSpeedC
75
,
15
=
=
When the unit is in the heat mode,
Hz
MaxSpeedC
Hz
MinSpeedH
95
,
20
=
=
ODUNload
is caculated according to the IDU NLoad:
⎭
⎬
⎫
⎩
⎨
⎧
=
127
,
*
3
min
ODUCode
IDUNLOAD
NLOAD
ODU
OAT ODUCodeC
ODUCodeC
IDUNLOAD
≤
-5 3 3
-5 3.8 3
Refer to sect.12.1.2.1
12.1.4 Frequency
Changes
Control
When the unit is running normally , the compressor frequency change rate is 1 Hz/sec.
