9. Deice Control
ƒU
Deicing operation is controlled by timer and sensing the indoor pipe temperature.
ƒU
Deicing operation checks the indoor pipe temperature and Intake-air temperature at 25 minutes and 60 min-
utes on starting of heating operation, and discriminates by temperature difference.
ƒU
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).
ƒU
When the heating operation passed 60 minutes, deicing operation checks the indoor pipe temperature (TE2)
and the indoor Intake-air temperature (TR2), and checks the temperature difference (
¡
T2=TE2–TR2) and the
temperature difference
¡
Td(=
¡
T1–
¡
T2) of
¡
T1,
¡
T2.
If the temperature difference (
¡
Td) become more than the option temperature, deicing operation starts.
ƒU
At that time, deicing operation time is decided.
ƒU
The deicing operation time stops after deicing operation started.
ƒU
If deicing operation start, above heating operation time is reset, so if deicing operation is finished, the heating
operation time is recounted.
ƒU
The deicinig time and the operation diagram are as following.
ƒ¡
19
ƒ¡
60 minutes
Heating
25 MINS
Heating
TE1
TR1
TE2
TR2
TR1
TE1
Heating
25 MINS
Deicing
Pipe Temp.
Intake Air
Temp.
T1
T2
T1
TEMP °C
INDOOR FAN
OUTDOOR FAN
COMPRESSOR
4WAY VALVE
ON
ON
ON
ON
OFF
OFF
ON
OFF
ON After HOT-START finished
ON
ON
ON
Td (=T1– T2)
Over 3.5°C
3.0~3.5°C
2.5~3.0°C
2.0~2.5°C
below 2.0°C
Deicing Time
12mins
11mins
10mins
9mins
Heating Operation
