Toyotomi TPN A128 IVP Service Manual page 27

compressor is heated without operation.
Preheating release condition:
If T4＞5℃ or the compressor starts running, the preheating function will stop.
8.3.8 Zero crossing detection error protection(except MSR1-24HRDN1-QRC4W)
If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display
the failure. The correct zero crossing signal time interval should be between 6-13ms.
8.3.9 Sensor protection at open circuit and breaking disconnection.
When there's one temperature sensor in malfunction, the air conditioner will display error code and will
not stop immediately, to avoid the case that the air conditioner is in urgent need.
Fault temp.
sensor
T1
T2
T3
T4
TP
T1
25
23
F4(30 minutes on+3
minutes off)
table 1
8.4.10 Refrigerant leakage detection
This function is only active in cooling mode. It can better prevent the compressor being damaged
by refrigerant leakage or compressor overload.
Operation in cooling, drying and
fan only mode
Run supposed T1=26℃ high fan
speed
Refer to table 1
Run with compressor frequency
not higher than F14
Run supposed T4=50℃
Run supposed T4=50℃
F12
Operation in heating mode
Run supposed T1=26℃ high fan
speed
Refer to table 2
3 minutes' defrosting every 40
minutes when T4<7℃; 2 minutes'
defrosting every 90 minutes when
T4≥7℃.
Run supposed T4=15℃
Run supposed T4=15℃
T1
20
18
F12(Indoor fan 1 minute
off, 1 minute M- ane then
the setting fan speed.)
27
F4
table 2