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Models C708/C709/C716/C717
Troubleshooting
Hot Gas Bypass Valve (DBV) Solenoid Valve
a. Stuck Closed: Suction will run in a vacuum cooling the hopper only. Frost back occurred at the
compressor.
Sloppy product for initial draw.
b. Stuck Open/Leaking: Trouble setting the barrel suction pressure due to DBV influence. Poor (cold,
lumpy) product quality.
If DBV is set to close to the barrel AXV, cooling will take longer.
Expected results with metering valves o u t of adjustment:
DBV: Too low could cause system to run in a vacuum with hopper only cooling.
Too high will cause inefficiency if set too close to AXV.
AXV: Too low will cause lower evaporator and product temperatures. Possible heavy scraping of blades
and barrel freeze up.
Too high will cause longer run times, warmer evaporator and product temperatures.
EPR: Too low will cause hopper product to freeze to the sides.
Too high will cause longer run times and could cause the hopper product to be warmer than 40°F
(4.4°C).
OPR: Too low will cause extended heat cycle heat phase times, less efficiency.
Too high will cause over amping of the compressor in the heat cycle heat phase and high pressure
cut out in the cool phase.
The OPR is very sensitive to high ambient conditions. Must be set in the ambient the machine will
run in.
TXV: The TXV is not adjustable.
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