Toshiba HWT-601XWHM3W-ETR Service Manual page 91

Item
7-4. 5) Defrosting control
Outdoor unit
5-1) Defrost operation
control
This control defrosts the outdoor heat exchanger. The temperature sensor (TE sensor) of the outdoor heat exchanger
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 ≤ TE < 12°C for a minute, the
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
(-30)*
* ( ): 801, 1101
A Zone
B Zone
C Zone
D Zone
Operation flow and applicable data, etc.
10 15 39
*
1
Maintain "(TEO - TE) - (ToO - To) ≥ 3°C" for 20 sec
Maintain "(TEO - TE) - (ToO - To) ≥ 2°C" for 20 sec
Accumulate compressor operation status of TE < -2°C for 150 min
39 (45)* 55 [d]
A zone
D zone
B zone
C zone
To Normal
Maintain "TE ≤ -23 (-30)* °C" for 20 sec
90
[min]
* In 10 to 15 minutes after the heating
1
operation starts, the lowest value of
TE is recorded as TEO, and the
lowest temperature of To as ToO.
* ( ): 801, 1101