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(5) Operation data during emergency operation
During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation
are set to the following values:
Operation data
Room temperature (TH1)
Indoor pipe temperature (TH2)
Indoor 2-phase pipe temperature (TH5)
Set temperature
Outdoor pipe temperature (TH3)
Outdoor discharge pipe temperature (TH4)
Outdoor 2-phase pipe temperature (TH6)
Outdoor air temperature (TH7)
Temperature difference code (room temperature - set temperature) (Tj)
Discharge superheat (SHd)
Sub-cool (SC)
Operation mode
COOL
27
5
5
25
45
80
50
35
5
30deg
5deg
HEAT
20.5
45
50
22
5
80
5
7
5
30deg
5deg
(+1)
(+1)
(+1)
(+1)
(+2)
(+2)
Remarks
+1: If the thermistor temperature data is normal (not open/short), that data is loaded into the control as valid data.
If the unit enters emergency operation because TH values have become mismatched, setting the thermistors
to open/short corrects the settings.
+2: If one thermistor is set to open/short, the values for each will be different.
[Example] When liquid temperature thermistor (TH3) has an open or short circuit.
COOL
45
Ta
Tc
5
5
HEAT
5
Tb
Td
50
45
Thermistor
TH3
TH6
TH4
TH5
TH2
Regard normal figure as effective data.
Regard normal figure as effective data.
Discharge superheat (SHd)
Cooling = TH4 - TH6 = Tc - Ta
Heating = TH4 - TH5 = Td - 50
Degree of subcooling (SC)
Cooling = TH6- TH3 = Ta -45
Heating = TH5- TH2 = 50 - 45 = 5
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