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Remember that suction refers to the low side, and is showing you what is happening with in the evaporator coil. Higher than normal pressures indicate the refrigerant is not transferring its heat into the air passing through evaporator coil.

You need to assess the air flow, are the filter or coil dirty, or is the ducting blocked, fan speed set up correctly. Try cleaning coils and a light weight filter, then recheck pressures.

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12y ago

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What will cause the suction pressure to rise?

An increase in the ambient temperature can cause the suction pressure to rise, as warmer air entering the system raises the pressure. Additionally, any restriction in the refrigerant flow or a dirty filter can also lead to a rise in suction pressure.


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If the suction pressure rises, the head pressure will also increase to match the rise. This is because the compressor will work harder to maintain the balance between the two pressures to ensure proper operation of the refrigeration system. A significant increase in the head pressure could lead to compressor overload or system inefficiency.


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Common causes of high suction pressure in a refrigeration system can include a dirty or blocked evaporator coil, low airflow due to a dirty filter or a malfunctioning blower motor, overcharge of refrigerant, or a faulty expansion valve. It could also be due to issues with the compressor such as overheating or mechanical failure.


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