Here are some tips to ensure maximum TXV performance.
Bulb Mounting/Location TipsExtreme care should be taken when mounting the thermal bulb of the TXV, since this is crucial to proper operation of the valve. Too often, this function is rushed and not done correctly. The results can be erratic valve operation and unnecessary valve adjustments along the way.
Valve Orientation Tips
External Equalizer Use Tips
Superheat Adjustment TipsMost expansion valves have an adjustment stem to vary the superheat. This is sometimes necessary because of the varied evaporators and load conditions any particular model valve may be used in. When making superheat adjustments, turn the stem no more than 1/4 to 1/2 rotation at one time. Let the system operate after an adjustment at least 15 minutes before checking the actual evaporator superheat.
Troubleshooting TipsThe chart above provides some tips for troubleshooting TXV problems.
Steve Maxson is a supermarket specialist for Parker Hannifin Corp., Climate & Industrial Controls Group, Cleveland. For more TXV information, go to www.parker.com/rac. Maxson can be contacted at firstname.lastname@example.org.
Publication date: 05/02/2005