Here are some possible causes of low suction pressure and high superheat in hvacr systems.
• Moisture, dirt, wax.
• Undersized valve.
• High superheat adjustment.
• Gas charge condensation.
• Dead thermostatic element charge.
• Wrong thermostatic charge.
• Evaporator pressure drop/no external equalizer.
• External equalizer location.
• Restricted or capped external equalizer.
• Low refrigerant charge.
• Liquid line vapor.
• Vertical lift.
• High friction loss.
• Long or small line.
• Plugged drier or strainer.
• Low pressure drop across valve.
• Same as No. 11 above.
• Undersized distributor nozzle or circuits.
• Low condensing temperature.
Source: Sporlan Valve Co.
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