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
12-13
CONTROL SYSTEM
SM DNGDCI 2-E.1 GB
12.9.7.2 Outdoor coil Deicing Protection For DCI72/80
Entering Deicing Conditions
Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – 8 AND TLD > DI
Case 2: OCT < OAT – 12 AND TLD > 30 minutes.
Case 3: OCT is Invalid AND TLD > DI
Case 4: Unit is just switched to STBY AND OCT < OAT – 8
Case 5: NLOAD = 0 AND OCT < OAT - 8
Case 6: OAT is invalid AND OCT< 8 AND TLD > DI AND Compressor ON Time > 15 minutes
All this condition will exist during 400 seconds
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval between Two Deicing)
Deicing interval is the time when compressor is first started in heat mode, is 10 minutes if OCT < -2,
and is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of deicing
time. If deicing time is shorter then former deicing time, the deicing interval time will be increased. If
deicing time is longer then former deicing time, the deicing interval time will be decreased.
Deicing Operation Procedure
T1=50 secondes;T2=36 secondes;T3=6 secondes
COMP
RV
OFAN
EEV
ON
HEAT
COOL
ON
OFF
EEVDeicerOpen
An
y
T1
12
0
Threshold
max. 12 minutes
DT
OCT
CONTENT