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Column 1 – Cool Vapor Valve Leaking
A leaking cool vapor valve must be replaced.
Column 2 – Low Charge/TXV Starving
Normally, a starving expansion valve only affects the
Freeze cycle suction, discharge pressure and ice fill
pattern. A low refrigerant charge will first affect the
harvest cycle pressures. As more refrigerant is lost
the freeze cycle pressures and fill pattern are affected.
Verify the ice machine is not low on charge before
replacing an expansion valve. Weigh the refrigerant
when it is recovered and verify the amount recovered
matches the ice machine model/serial plate amount.
Column 3 – TXV Flooding/Overcharge
A loose or improperly mounted expansion valve bulb
causes the expansion valve to flood. Check bulb
mounting, insulation, etc., before changing the valve.
On dual expansion valve machines, the service
technician should be able to tell which TXV is flooding
by analyzing ice formation patterns. Change only the
flooding expansion valve. Weigh the refrigerant when
it is recovered and verify the amount recovered
matches the ice machine model/serial plate amount.
Column 4 – Compressor
Replace the compressor and start components. To
receive warranty credit, the compressor ports must be
properly sealed by crimping and soldering them
closed. Old start components must be returned with
the faulty compressor.
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