Quick Heating Control; Defrost Control (Only In Heating Operation) - Toshiba RAS-10GAVP-E Service Manual

Item
7. Quick heating This function quickens the starting of heating opera-
control tion 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
temperature and then it enables the hot air blowing
out quickly.
In case of operation stop
The previous operation was heating and
2 hours passed after the operation had stopped.
Winding is not heated.
20˚C
–1˚C
–3˚C
–6˚C
–8˚C
8. Defrost control (This function removes frost adhered to the outdoor
(Only in heating heat exchanger.)
operation)
The temperature sensor of the outdoor heat ex-
changer (Te sensor) judges the frosting status of the
outdoor heat exchanger and the defrost operation is
performed with 4-way valve reverse defrost system.
Start of heating operation
0' 10' 15'
–5˚C
–7˚C
–20˚C
*
* The minimum value of Te sensor 10 to 15 minutes
after start of operation is stored in memory as Te0.
When Te0 - TE
A zone
defrost operation starts.
When the operation continued for 2 minutes in B zone,
B zone
defrost operation starts.
When Te0 - TE
C zone
defrost operation starts.
Operation flow and applicable data, etc.
YES
Heating output for winding
20W or equivalent
20W or equivalent
Operation time
27'40" 34'
(Minute)
C zone
A zone
B zone
Table 1
2.5 continued for 2 minutes in A zone,
3 continued for 2 minutes in C zone,
When the following conditions are
satisfied, winding is heated by output
varied by the outdoor heat exchanger
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.
NO
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 tempera-
OFF
ture (
the heat is stored.
The necessity of defrost operation is
detected by the outdoor heat exchanger
temperature. The conditions 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
2) Invert (ON) 4-way valve 10 seconds
3) The outdoor fan stops at the same time
4) When temperature of the indoor heat
<Finish of defrost operation>
• Returning conditions from defrost
1) Temperature of outdoor heat exchanger
2) Temperature of outdoor heat exchanger
3) Defrost operation continues for
<Returning from defrost operation>
1) Stop operation of the compressor for
2) Invert (OFF) 4-way valve approx. 40
3) The outdoor fan starts rotating at the
– 33 –
Description
for each outdoor temperature) and
20 seconds.
after stop of the compressor.
when the compressor stops.
exchanger becomes 38°C or lower,
stop the indoor fan.
operation to heating operation
rises to +8°C or higher.
is kept at +5°C or higher for 80 seconds.
15 minutes.
approx. 50 seconds.
seconds after stop of the compressor.
same time when the compressor starts.