Service manual
Table Of Contents
- DNG DC Inverter Series
- LIST OF EFFECTIVE PAGES
- TABLE OF CONTENTS
- INTRODUCTION
- PRODUCT DATA SHEET
- RATING CONDITIONS
- OUTLINE DIMENSIONS
- PERFORMANCE DATA & PRESSURE CURVES
- AIRFLOW CURVES
- SOUND LEVEL CHARACTERISTICS
- ELECTRICAL DATA
- WIRING DIAGRAMS
- REFRIGERATION DIAGRAMS
- TUBING CONNECTIONS
- CONTROL SYSTEM
- TROUBLESHOOTING
- EXPLODED VIEWS AND SPARE PARTS LISTS
- APPENDIX A
12-2
CONTROL SYSTEM
SM DNGDCI 2-E.1 GB
12.1.2 Target Frequency Setting
12.1.2.1 Target Frequency Setting for DCI 50/60
The compressor target frequency is a function of the NLOAD number sent from the indoorcontroller
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 MaxFreqAsOATC No limit
6 ≤ OAT < 15 MaxFreqAsOAT1H
15 ≤ OAT < 28 MaxFreqAsOAT2H
28 ≤ OAT No limit
12.1.2.2 Target Frequency Setting for DCI 72/80
The compressor Target Speed is calculated according to the following formula:
MinSpeed, MaxSpeed are defined as following:
When the unit is in the cool mode, MinSpeedC = 15Hz, MaxSpeedC = 75Hz
When the unit is in the heat mode, MinSpeedH = 20Hz, MaxSpeedH = 95Hz
ODUNload is caculated according to the IDU NLoad:
127,
*3
min
ODUCode
IDUNLOAD
NLOADODU
127
,maxarg
ODUNload
MaxSpeedMinSpeedSpeedetT
load
CONTENT