– 33 –
Item
7. Quick heating
control
Operation flow and applicable data, etc.
This function quickens the starting of heating operation
when indoor/outdoor temperature is low.
(Available only in heating operation)
When indoor temperature is low, this function stores the
heat by heating winding depended on the outdoor tem-
perature and then it enables the hot air blowing out
quickly.
Description
When the following conditions are
satisfied, winding is heated by output
varied by the outdoor heat ex-
changer temperature.
Condition 1 :
The previous operation was heating.
Condition 2 :
2 hours passed after operation stop.
Condition 3 :
The room temperature is 20°C or
lower.
The indoor temperature sensor
detects the room temperature.
If the detected room temperature is
20°C or lower, the outdoor heat
exchanger temperature sensor
detects the outdoor heat exchanger
temperature. As shown in the left
figure, winding of the compressor is
heated for each division of the
temperature (
for each outdoor
temperature) and the heat is stored.
8. Defrost control
(Only in heating
operation)
(This function removes frost adhered to the outdoor heat
exchanger.)
The temperature sensor of the outdoor heat exchanger
(Te sensor) judges the frosting status of the outdoor heat
exchanger and the defrost operation is performed with
4-way valve reverse defrost system.
The necessity of defrost operation is
detected by the outdoor heat
exchanger temperature. The condi-
tions to detect the necessity of
defrost operation differ in A, B, or C
zone each. (Table 1)
<Defrost operation>
• Defrost operation in A to C zones
1) Stop operation of the compressor
for 20 seconds.
2) Invert (ON) 4-way valve 10
seconds after stop of the com-
pressor.
3) The outdoor fan stops at the same
time when the compressor stops.
4) When temperature of the indoor
heat exchanger becomes 38°C or
lower, stop the indoor fan.
<Finish of defrost operation>
• Returning conditions from defrost
operation to heating operation
1) Temperature of outdoor heat
exchanger rises to +8°C or higher.
2) Temperature of outdoor heat
exchanger is kept at +5°C or
higher for 80 seconds.
3) Defrost operation continues for
15 minutes.
<Returning from defrost operation>
1) Stop operation of the compressor
for approx. 50 seconds.
2) Invert (OFF) 4-way valve approx.
40 seconds after stop of the
compressor.
3) The outdoor fan starts rotating at
the same time when the compres-
sor starts.
Table 1
A zone
B zone
C zone
When Te0 - TE ≥ 2.5 continued for 2 minutes in
A zone, defrost operation starts.
When the operation continued for 2 minutes in
B zone, defrost operation starts.
When Te0 - TE ≥ 3 continued for 2 minutes in C
zone, defrost operation starts.
*
The minimum value of Te sensor 10 to 15 minutes after
start of operation is stored in memory as Te0.
20˚C
–1˚C
–3˚C
–6˚C
–8˚C
OFF
Heating output for winding
20W or equivalent
20W or equivalent
Winding is not heated
Indoor temperature
Outdoor heat exchanger
temperature
The previous operation was
heating and 2 hours passed after the
operation had stopped.
In case of operation stop
YES
NO
–5˚C
0’ 10’ 15’ 27’40” 34’
–7˚C
–20˚C
Operation time
(Minute)
Start of heating operation
*
Outdoor heat exchanger temperature
C zone
A zone
B zone
To Next Page
Loading...
