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
12-6
CONTROL SYSTEM
SM DNGDCI 2-E.1 GB
12.1.8.2 EEV Control for DCI72/80
The target EEV value is the sum of open loop value (OL) and a result of the accumulative correction
values (CV).
The EEV intial value(OL) is defined as follow:
EEV
OL
= EEVBaseOpenLoop + EEVOpenLoopCpctyCrct + EEVTubeCompnst
EEVBaseOpenLoop
Basic EEV open loop
EEVOpenLoopCpctyCrct
Open Loop correction
EEVTubeCompnst
EEV tube Length
compensation
Mode DNG72/80 DNG72/80 DNG72/80
COOL 220 25 0
HEAT 210 30 0
EEV
CV is a correction value for the EEV opening that is based on the compressor temperature,
During the first 6 minutes after SB the correction is not calculated. After that the correction value is
updated every 30 seconds.
12.1.9 RV(Reversing Valve) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.
12.1.10 Ioniser Control
Ioniser is on when unit is on ,AND indoor fan is on ,AND Ioniser power switch (on Ioniser) is on.
12.1.11 Base Heater Control
The base heater will be working only when RV is “ON” according to the following graph:
When OAT is faulty the base heater will be “ON” continuously in HEAT mode.
CVOL
EEVEEVEEV
ON
OFF
OAT
0
2
Base
Heater
CONTENT