Annex I: Alarm Table - Midea MAD020T1N1S1 Technical Manual

Midea Precision AC Technical Manual

Annex I: Alarm table

Alarm display
Low pressure compressor 1
Lose of airflow (Serious Alarm) UNIT OFF
Main fan overload(Serious Alarm) UNIT OFF
EL heater1 overload
EL heater2 overload
Fire / Smoke detected(Serious Alarm) UNIT
OFF
Power alarm
High room temperature
Low room temperature
High room humidity
Low room humidity
Operating hour threshold reached for
compressor 1
Operating hour threshold reached for mail
fan
Room temperature probe faulty or
disconnected
Supply temperature probe faulty or
disconnected
Room humidity probe faulty or disconnected
Condenser 1 pressure probe faulty or
disconnected
94
Result
Switch off the compressor 1.
Switch off the unit
Switch off the unit
Switch off the E-heater 1
Switch off the E-heater 2
Switch off the unit
Switch off the unit
Switch off E-heater and
compressor
Switch off humidifier and
compressor
Switch off compressor
MCAC-PDSM-2013-01
Probable reason
10s after the low pressure switch is
trigged.
10s after the airflow switch from close to
open.
Indoor fan motor protector acts.
The overload protector of E-heat 1 acts.
The overload protector of E-heat 1 acts.
Fire/smoke protector acts.
sequence protector is trigged.
Phase
It keeps 10s after difference between Ta
and Ts is higher than design value. The
unit will alarm.
It keeps 10s after difference between Ta
and Ts is lower than design value. The unit
will alarm.
It keeps 10s after difference between Ha
and Hs is higher than design value. The
unit will alarm.
It keeps 10s after difference between Ha
and Hs is lower than design value. The unit
will alarm.
Only remind, need to cancel alarm.
Only remind, need to cancel alarm.
a、 When Ta is lower than -30°C and
keeping 60s, alarms and switches off
all the E-heater. When Ta is lower
than 50°C, 999.9°C will be displayed.
b、
When Ta is higher than 80°C and
keeping 60s, alarm and switch off
compressor. When Ta is higher than
95°C, 999.9°C will be displayed.
W
a、 hen Ts is lower than -30°C and
keeps 60s, unit will alarm. When Ts is
lower than -50°C, -999.9°C will be
displayed.
b、
When the supply air temperature is
higher than 80°C and keeps 60s, unit
will alarm. When it is higher than
95°C, 999.9°C will be displayed.
a、 When Ha is lower than 5% and it
keeps 60s, unit will alarm and
switch off humidifier.
b、 When Ha is higher than 90% and
it keeps 60s, unit will alarm and
switch off compressor.
a. When discharge pressure
displayed is lower than -3.4bar
and it keeps 60s, the unit will
alarm.
b. When discharge pressure
displayed is higher than 37.4bar
and it keeps 60s, unit will alarm.