53
(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
Pressure saturation temperature (T
63HS
)
Liquid temperature (TH3)
Discharge pipe temperature (TH4)
2-phase pipe temperature (TH6)
Ambient temperature (TH7)
Temperature difference code (intake temperature - set temperature) (Tj)
Discharge superheat (SHd)
Sub-cool (SC)
Operation mode
COOL
27
5
5
25
50
45
80
50
35
5
30deg
5deg
HEAT
20.5
45
50
22
50
5
80
5
7
5
30deg
5deg
(
+
1)
(
+
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 emegency operation with the values listed above.
+
2: If one thermistor is set to open/short, the values for each will be different from the list above.
[Example] When pipe temperature thermistor (TH3) has an open or short circuit.
COOL
45
Ta
Tc
5
5
Te
HEAT
5
Tb
Td
50
45
Tf
Thermistor
TH3
TH6
TH4
TH5
TH2
T
63HS
Regard normal figure as effective data.
Regard normal figure as effective data.
—
—
—
—
—
Discharge superheat (SHd)
Cooling = TH4 - T
63HS
= Tc - Te
Heating = TH4 - T
63HS
= Td - Tf
Degree of subcooling (SC)
Cooling = T
63HS
- TH3 = Te - 45
Heating = T
63HS
- TH2 = Tf - 45
Regard normal figure as effective data.
OCH526
