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
12-4
CONTROL SYSTEM
SM DNGDCI 2-E.1 GB
12.1.5 Minimum On and Off Time
3 minutes
12.1.6 Indoor Fan Control
8 Indoor fan speeds are determined for each model. 4 speeds for cool/dry/fan modes and 4speeds
for heat mode.When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will
operateconstantly at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is
setaccording to the cool/heat load.
12.1.6.1 Turbo Speed
The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
Difference between set point and actual room temperature is bigger then 3 degrees.
Room temperature > 22 for cooling, or < 25 for heating.
12.1.7 Outdoor Fan Control
12.1.7.1 Outdoor Fan Control for DCI60
7 outdoor fan speeds are determined for each model. 3 speeds for cool and dry modes, and 3speeds
for heat mode, and a very low speed.
Outdoor fan speed is a function of compressor frequency and outdoor air temperature (OAT).
4 routines for fan control are determined. The control routine selection depends on operationmode,
compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).
Routine Conditions
A
Heating with OAT < 15 ºC
or
Cooling with OAT > 20 ºC
or
Faulty OAT
B Cooling with 20ºC > OAT > 7ºC
C Cooling with 7ºC > OAT
D Heating with OAT > 15ºC
CONTENT