Electra LEX 25 DCI Service Manual page 66

CONTROL SYSTEM
Target frequency limits as a function of outdoor air temperature (OAT):
OAT Range
OAT < 6
6 ≤ OAT < 15
15 ≤ OAT < 28
28≤ OAT
12.1.3.2 Target Frequency Setting for DCI 72 / 80
The compressor Target Speed is calculated according to the following formula:
arg max
T et Speed
load
MiniSpeed, MaxSpeed
When the unit is in the cool mode,
When the unit is in the heat mode,
ODU NLOAD
is caculated according to the IDU NLoad:
­
3
min
®
ODU NLOAD
¯
OAT ODUCodeC
≤-5
≤-5
12.1.4 Frequency Changes Control
When the unit is running normally , the compressor frequency change rate is 1 Hz/sec.
12.1.5 Compressor Starting Control
12.1.5.1 Compressor starting control for DCI 50 / 60 / 72 Z
Step3
Step2
Step1
1
Minute
12-2
Cooling Mode limits
MaxFreqAsOATC
No limit
ª
,
MinSpeed MaxSpeed
«
¬
are defined as following:
MiniSpeedC = 15Hz, MaxSpeed = 75Hz
MiniSpeedH = 20Hz, MaxSpeed = 95Hz
½
*
IDUNLOAD
, 127
¾
ODUCode ¿
ODUCodeC
3 3
3.8 3
1
Minute
Min 10 Minutes
CONTENTS
Heating Mode limits
No limit
MaxFreqAsOAT1H
MaxFreqAsOAT2H
º
ODUNload
˜
»
127
¼
IDUNLOAD
Refer to sect.112.1.2.1
Time
SM LEXDCI 1-E.1 GB