Operation Guideline - Daikin VRV Plus Series General Information Manual

Si33-003.book Page 181 Monday, June 25, 2001 9:06 AM
SiE33-003

7. Operation Guideline

7.1

Operation Guideline

The following guideline figures in the table indicate refrigerant conditions. These values are obtained in a
simulation conducted under the conditions listed under the table.
Discharge pressure (high pressure)
Suction pressure (low pressure)
Discharge temperature
Suction temperature
(Conditions)
Condensation temperature : 50˚C, evaporation temperature : 5˚C, degree of supercool : 5˚C, degree of
superheat : 5˚C
The other simulation conditions for R22, R-407C and R410A are same. Absolute pressure was used for
dischange pressure and suction pressure.
Unlike R22, the new refrigerants, R-407C undergo a temperature change during a phase change
(condensation process and evaporation process).
→To diagnose problems using the temperature difference at the inlet and outlet of a heat exchanger, take
into consideration the temperature difference caused by the above temperature change. (Temperature
drops during condensation process, while it increases during evaporation process.)
Graphs based on above simulation results
R-407C
Note: In actual products, conditions may differ slightly, as the figures shown above.
New Refrigerant R-407C
R22 R-407C
MPa(kgf/cm²) 1.94 (19.8) 2.11 (21.5)
Mpa(kgf/cm²) 0.58 (5.96) 0.59 (5.97)
˚C 74.07 70.67
˚C 10.00 12.26
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Operation Guideline
(Source : DAIREP2.0)
R410A
3.07 (31.3)
0.93 (9.53)
74.99
10.05
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