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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
Intake temperature (TH1)
Indoor liquid pipe temperature (TH2)
Indoor 2-phase pipe temperature (TH5)
Set temperature
Outdoor fluid pipe temperature (TH3)
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
50
35
5
30deg
5deg
HEAT
20.5
45
50
22
5
5
5
5
30deg
5deg
(*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.
When the unit enters emergency operation and TH values are mismatched, set the thermistors to open/short.
And the unit runs emergency operation with the values listed above.
*2 If one thermistor is set to open/short, the value of SHd/SC will be different from the list above.
[Example] When liquid temperature thermistor (TH3) has an open or short circuit.
COOL
45
Ta
5
5
HEAT
5
Tb
50
45
Thermistor
TH3
TH6
TH5
TH2
Regard normal figure as effective data.
Degree of subcooling (SC)
Cooling = TH6- TH3 = Ta -45
Heating = TH5- TH2 = 50 - 45 = 5 deg.
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