-18-
T1
TE1
TE2
T2
COMPRESSOR
TEMP
°
C
Pipe Temp.
Intake Air
Temp.
4-WAY VALVE
OUTDOOR FAN
INDOOR FAN
DEICE LED
ON
Heating
25 mins
60 minutes
25 mins
Deicing
Hot
Start
Heating
ON(Heating Operation)
ON
ON
OFF
ON
ON
ON
ON
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
T1
T2
9. Deice Control
•
Deicing operation is controlled by timer and sensing the indoor pipe temperature.
•
Deicing operation checks the indoor pipe temperature and Intake-air temperature at 25 minutes and 60 minutes
on starting of heating operation, and discriminates by temperature difference.
•
When the heating operation passed 25 minutes, the temperature (
△
T1=TE1–TR1) is checked and memorized
with checking the indoor pipe temperture (TE1) and the indoor Intake-air temperature (TR1).
•
When the heating operation passed 60 minutes, deicing operation checks the indoor pipe temperature (TE2)
and the indoor Intake-air temperature (TR2), and checks indoor pipe temperature(TE2), the temperature
difference (
△
T2=TE2–TR2) and the temperature difference
△
Td(=
△
T1–
△
T2) of
△
T1,
△
T2.
If temperature of indoor pipe is below 32°C Deicing function operates at the priority I condition.
If temperature of indoor pipe is over 32°C Deicing function operates at the priority II condition.
If the temperature difference (
△
Td) become more than the option temperature, deicing operation starts.
•
At that time, deicing operation time is decided.
•
The deicing operation time starts after deicing operation started.
•
If deicing operation start, above heating operation time is reset, so if deicing operation is finished, the heating
operation time is recounted.
•
The deicinig time and the operation diagram are as following.
T1-
T2
Td
Over 6°C
5~6°C
4~5°C
3~4°C
below 2.0°C
Deicing Time
10mins
9mins
8mins
7mins
Heating Operation
TE2
Below 30°C
30~31°C
31~32°C
Over 32°C
Deicing Time
12mins
11mins
10mins
Heating Operation
(DEICING DIAGRAM)
Priority I
Priority II
