Outdoor Fan; Way Valve - Toshiba HWS-803XWHM3-E Service Manual

Item
8-4. 6) Defrosting control
Outdoor unit
This control defrosts the outdoor heat exchanger. The temperature sensor (TE sensor) of the outdoor heat exchanger
control
determines frost formation, and then defrosting is performed in the 4-way valve reverse defrosting method.
1) During a heating operation, defrosting is performed when the TE sensor meets any of the conditions in A through D
zones.
2) During defrosting, when TE sensor maintains 12°C or higher for 3 seconds or 7°C
defrosting ends. Also, when defrosting continues for 10 minutes even if the TE sensor temperature is below 7°C, the
defrosting ends.
3) After the defrosting, stop the compressor for approx. 40 seconds before starting a heating operation.
4) Switching the jumper "J805" and "J806" of the outdoor control board can change the time of d above mentioned.
(Factory default: 150 minutes)
Heating operation starts
0
TE
[ ]
°C
-2
-5
-10
-23
(-25)* 2
A Zone
B Zone
C Zone
D Zone
A Zone
B Zone
C Zone
D Zone
Jumper switching
J805
O
O
×
×
Compressor

Outdoor fan

4-way valve

Outdoor PMV
Operation flow and applicable data, etc.
10 15 39
1
*
Maintain " (TEO - TE) - (ToO - To)
Maintain " (TEO - TE) - (ToO - To)
Maintain " TE
Maintain " TE < -25°C" for 20 sec (803H-E)
Accumulate compressor operation status of TE < -2°C for 150 min
Maintain " TE
Maintain " TE < -25°C" for 20 sec (803H-E)
Accumulate compressor operation status of TE < -2°C for 150 min
O: Short circuit ×: Open
J806 [d]
O 150 min (Factory default)
× 90 min
O 60 min
× 30 min
ON
OFF
ON
OFF
ON
OFF
500pulse
200pulse
0pulse
0s 30s 40s
78
45 55 [d]
[min]
A zone
D zone
B zone
C zone
To Normal
3°C" for 20 sec
2°C" for 20 sec
-23°C" for 20 sec (except 803H-E)
To Normal
Maintain " TEO - TE 3°C" for 20 sec
Maintain " TEO - TE 2°C" for 20 sec
-23°C" for 20 sec (except 803H-E)
Defrosting operation
0s 10s
TE < 12°C for a minute, the
* 1 In 10 to 15 minutes after the heating
operation starts, the lowest value of
TE is recorded as TEO, and the
lowest temperature of To as ToO.
* 2 Inside brackets: For 803H-E
30s 40s