Midea MCH2U-18PHH2 Service Manual page 16

----If the temperature increase and T5≧110℃
℉), decrease the frequency to a lower
(230
level every 2 minutes till to F1.
---If T5≧115℃ (239
compressor stops and then restart untill
T5<90℃ (194 ℉).
6.3.3 Fan Speed Malfunction
---- If outdoor fan speed is lower than
100RPM or higher than 2400RPM for 60
seconds or more, the unit stops and LED
displays failure code.
E8
6.3.4 Inverter Module Protection.
---- The inverter protection module ensures
that faults related to current, voltage, or
temperature does not damage the inverter.
If these protections are triggered, the A/C
unit stops and the LED displays the failure
code.
The unit restarts 3 minutes after the
protection mechanism has turned off.
6.3.5 Low Voltage Protection
V O L T A G E
Note: If low voltage protection triggers and
voltage is not restored to normal within 3
minutes, the protection remains active
even after a machine restart.
6.3.6 Compressor Current Limit
Protection
℉) for 10 seconds, the
N o lim it
V O L T _ LT M _ F R E Q 1_ A D D
V O L T _ LT M _ F R E Q 2 _ A D D
The temperature interval for the current limit
is the same as the range of the T4
frequency limit.
Cooling mode:
CoolT4Zone5I
℃
50
49
CoolT4Zone4I
45
44
41
CoolT4Zone3I
40
33
32
CoolT4Zone2I
CoolReturnI
CoolT4Zone5I
CoolT4Zone4I
CoolT4Zone3I
CoolT4Zone2I
CoolT4Zone1I
CoolStopI
Heating mode:
16
The difference between
current limit
and shutdown current
Cooling T4≥50℃ current
limit value
Cooling 49＞T4≥45℃
current limit value
Cooling 44＞T4≥41℃
current limit value
Cooling 40﹥T4≥33℃
current limit value
Cooling 32＞T4℃current
limit value
Cooling stop protection
current value