Thermal Zone 12H47YIMI, Руководство по обслуживанию

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5. Inverter module protection
The inverter module has a protection feature for current, voltage, and temperature. If any of
these do not operate properly, the unit will shut off and display the corresponding error code.
6. Indoor fan delayed open function
When the unit starts up, the louver will begin moving immediately but the indoor fan will
open ten (10) seconds afterwards.
7. Compressor preheating function
When it is cold, the oil in the compressor will not properly lubricate the compressor. A
compressor heating belt can preheat the compressor (and oil) to prevent damage.
▪
If T4 < 37.4°F and the system was recently connected to the power supply or has been
off for over three (3) hours, the compressor heating cable will turn on during startup.
▪
When T4 > 41°F, the compressor will start running and the compressor heating belt
will turn off.
8. Zero crossing detection error protection
If the AC time interval is not correct for a continuous 240 seconds, the unit will stop operating
and the
E2 error code will display on the panel. The correct zero crossing signal time interval
should be between 6-13ms.
9. Condenser temperature protection
The condenser has a temperature protection system to prevent it from getting too cold. This
is important because the refrigerant system was designed to operate at a specific safety
pressure. If the pressure gets too high, the compressor may get overload and an explosion
may even occur in extreme circumstances.
•
T3 > 140°F (for 5 sec) Compressor will stop until T3 < 125.6°F.
•
131°F < T3 < 140°F Compressor slowly decrease speed every three (3) minutes.
•
125.6°F < T3 < 131°F Compressor operates at the current speed.
•
T3 < 125.6°F Compressor maintains or increases the speed.
10. Evaporator temperature protection
The evaporator has a temperature protection system to prevent it from getting too cold. This
is important because if the evaporator coils are too cold, too much condensate will be created
which may get blown out by the fan or even freeze on the coils. The compressor operation
will be as follows.
•
T2 > 44.6°F Compressor maintains or increases the speed.
•
39.2°F < T2 < 44.6°F Compressor operates at the current speed.
•
32°F < T2 < 39.2°F Compressor decreases speed every three (3) minutes.
•
T2 < 32°F Compressor will stop and restart when T2 ≥ 41°F .
11. Low voltage protection
Voltage that is too low can cause overheating in the unit. To prevent this, all units come
equipped with a low voltage protection system. When the voltage drops too low, the unit will
reduce the frequency going to the compressor. If the voltage is still low after three (3) minutes,
the unit will keep running at the lower frequency with the error code
P1 display on the panel
until the unit is restarted.