Midea MCH2U-18PHH2, Service Manual

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refrigerant system.
For MCH3U-27PHH2/MCH4U-
36PHH2/MCH5U-48PHH2
There are one low-pressure centralized valve
and one high-pressure centralized valve, it will
be more time saving when vacuum and
recycle refrigerant. But refer to the previous
instruction when vacuum and recycle
refrigerant.
6. Electronic Function
6.1 Abbreviation
T1: Indoor ambient temperature
T2: Middle indoor heat exchanger coil
temperature
T2B: Indoor heat exchanger exhaust coil
temperature (located on the outdoor unit)
T3: Outdoor heat exchanger pipe
temperature
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
6.2 Electric Control Working
Environment.
6.2.1 Input voltage: 230V.
6.2.2 Input power frequency: 60Hz.
6.2.3 Indoor fan standard working amp.: <1A
6.2.4 Outdoor fan standard working amp.:
<1.5A.
6.2.5 Four-way valve standard amp.: <1A.
6.3 Main Protection
6.3.1 Compressor Restart Delay
---- The compressor takes 1 minute to start
up the first time. Further restarts take 3
minutes.
6.3.2 Temperature Protection of
Compressor Discharge.
When the discharge temperature of the
compressor rises, the running frequency is
limited according to the following rules:
----If 10 5
℃
( 221
℉
)
≦
T5< 110
℃
(230
℉
),
maintain the current frequency.