HIGH SUPERHEAT – Inadequate Sub-Cooling

On August 31, 2010, in Trouble Shooting, by Tradewinds

HIGH SUPERHEAT 1.4. Inadequate Sub-Cooling Probable Cause •    If the system has been designed to provide  a specific amount of sub-cooling to compensate for its pressure losses and the liquid is inadequately subcooled, then flash gas will occur at the TEV. Remedy Increase the sub-cooling to the desired levels for proper system performance.

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HIGH SUPERHEAT – Improper Piping Design

On August 24, 2010, in Trouble Shooting, by Tradewinds

HIGH SUPERHEAT 1.3. Improper Piping Design Probable Cause •     Excessive vertical lift of the liquid line. a)    Generally, for every 30cm of vertical lift using R22, there is a 0.5psi drop in pressure. b)    If a system has excessive vertical lift the flash gas will form. •    Liquid line is too long, too small [...]

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HIGH SUPERHEAT – Liquid Line Restrictions

On August 17, 2010, in Trouble Shooting, by Tradewinds

HIGH SUPERHEAT 1.2 Liquid Line Restrictions Probable Cause •     Partially plugged liquid line filter drier. Look for a temperature difference on either side of the drier. This will indicate a significant pressure drop across the filter and indicate that it is plugged. If this occurs, then the filter must be replaced as soon as [...]

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HIGH SUPERHEAT (Evaporator Outlet)

On August 10, 2010, in Trouble Shooting, by Tradewinds

1.1 Flash Gas in the Liquid Line Flash gas at the inlet of a Thermostatic Expansion Valve (TEV) will obstruct the flow of liquid refrigerant and therefore, starve the evaporator. There is nothing good about the presence of  “Flash Gas” and if it does occur, then the following conditions can be expected: a)    The valve [...]

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