Test Run and Operation Data ESIE05-04
4–26 Part 4 – Commissioning and Test Run
Correlation of
Air-Conditioner’s
Operation Status
and Pressure /
Running Current
What happens in comparison to normal values is summarized in the table below.
(Measured from 15 ~ 20 minutes or more after operation starts.)
When Cooling
When Heating
Notes:
Q ∗1. Water in the refrigerant freezes inside the capillary tube or expansion valve, and is basically
the same phenomenon as pump down.
Q ∗2. Dirt in the refrigerant clogs filters inside the piping, and is basically the same phenomenon as
pump down.
Q ∗3. Pressure differential between high and low pressure becomes low.
Air-Conditioner Status Low Pressure High Pressure Running Current
Air Filter Fouling Lower Lower Lower
Short Circuit of Indoor Unit
Inlet/Outlet Air
Lower Lower Lower
Outdoor Unit Fin Fouling Higher Higher Higher
Short Circuit of Outdoor Unit
Inlet/Outlet Air
Higher Higher Higher
Air Mixed in Refrigerant Higher Higher Higher
Water Mixed in Refrigerant ∗1 Lower Lower Lower
Dirt Mixed in Refrigerant ∗2 Lower Lower Lower
Lack of Refrigerant (Gas) Lower Lower Lower
Unsatisfactory Compression ∗3 Higher Lower Lower
Air-Conditioner Status Low Pressure High Pressure Running Current
Air Filter Fouling Higher Higher Higher
Short Circuit of Indoor Unit
Inlet/Outlet Air
Higher Higher Higher
Outdoor Unit Fin Fouling Lower Lower Lower
Short Circuit of Outdoor Unit
Inlet/Outlet Air
Lower Lower Lower
Air Mixed in Refrigerant Higher Higher Higher
Water Mixed in Refrigerant ∗1 Lower Lower Lower
Dirt Mixed in Refrigerant ∗2 Lower Lower Lower
Lack of Refrigerant (Gas) Lower Lower Lower
Unsatisfactory Compression ∗3 Higher Lower Lower
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