65
(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 pipe temperature (TH2)
Indoor 2-phase pipe temperature (TH5)
Set temperature
Outdoor liquid pipe temperature (TH3)
Outdoor discharge pipe temperature (TH4)
Outdoor 2-phase pipe temperature (TH6)
Outdoor ambient 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
30
:
5
:
HEAT
20.5
:
45
:
50
:
22
:
5
:
80
:
5
:
7
:
5
30
:
5
:
(*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.
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 values for SHd/SC will be different from the list above.
[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
:
—
—
—
—
—
OCH653
