61
(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 fluid 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 (intake temperature - set temperature) (
∆
Tj)
Discharge super heat (SHd)
Sub-cool (SC)
Operation mode
COOL
27
:
, 81˚F
5
:
, 41˚F
5
:
, 41˚F
25
:
, 77˚F
45
:
, 113˚F
50
:
, 122˚F
35
:
, 95˚F
5
30degC, 54degF
5degC, 9degF
HEAT
20.5
:
, 69˚F
45
:
, 113˚F
50
:
, 122˚F
22
:
, 72˚F
5
:
, 41˚F
5
:
, 41˚F
7
:
, 45˚F
5
30degC, 54degF
5degC, 9degF
(
w
1)
(
w
1)
(
w
1)
(
w
1)
(
w
2)
Remarks
w
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.
w
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
:
, 113˚F
Ta
Tc
5
:
, 41˚F
5
:
, 41˚F
HEAT
5
:
, 41˚F
Tb
Td
50
:
, 122˚F
45
:
, 113˚F
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
:
or 122˚F)
Degree of subcooling (SC)
Cooling = TH6 - TH3 = Ta - (45
:
or 113˚F)
Heating = TH5 - TH2 = 50
:
- 45
:
= 5 degC.
or
= 122˚F - 113˚F = 9degF
OC367C--3.qxp 07.6.20 0:54 PM Page 61
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