61
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 out 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.
Summary of Contents for C708
Page 1: ...Models C708 C709 C716 C717 Heat Treatment Soft Serve Freezers Service Manual 059061 S 6 15 05 ...
Page 2: ......
Page 6: ...Table of Contents Models C708 C709 C716 C717 Notes ...
Page 22: ...16 Introduction Models C708 C709 C716 C717 Notes ...
Page 49: ...43 Models C708 C709 C716 C717 Systems Controls and Operations C708 C709 Control Overview ...
Page 50: ...44 Systems Controls and Operations Models C708 C709 C716 C717 C716 C717 Control Overview ...
Page 53: ...47 Models C708 C709 C716 C717 Systems Controls and Operations Refrigeration Schematic ...
Page 70: ...64 Troubleshooting Models C708 C709 C716 C717 Notes ...
Page 73: ...67 Models C708 C709 C716 C717 Parts Notes ...
Page 74: ...68 Parts Models C708 C709 C716 C717 Model C708 Exploded View ...
Page 78: ...72 Parts Models C708 C709 C716 C717 Model C709 Exploded View ...
Page 82: ...76 Parts Models C708 C709 C716 C717 Model C716 Exploded View ...
Page 86: ...80 Parts Models C708 C709 C716 C717 Model C717 Exploded View ...
Page 133: ...C708 C709 057010 27 Rev 6 05 ...
Page 134: ...C708 C709 057010 33 Rev 6 05 ...
Page 135: ...C708 C709 057010 40 Rev 6 05 ...
Page 136: ...C708 C709 057010 58 Rev 6 05 ...
Page 137: ...Model C716 059900 27 Rev 2 06 ...
Page 138: ...Model C716 059900 27 Inset 1 2 06 ...
Page 139: ...Model C716 059900 27 Inset 2 2 06 ...
Page 140: ...Model C716 059900 33 Rev 2 06 ...
Page 141: ...Model C716 059900 40 Rev 2 06 ...
Page 142: ...Model C716 059900 58 Rev 2 06 ...
Page 143: ...Model C717 059901 27 6 05 ...
Page 144: ...Model C717 059901 27 Inset 1 6 05 ...
Page 145: ...Model C717 059901 27 Inset 2 6 05 ...
Page 146: ...Model C717 059901 33 6 05 ...
Page 147: ...Model C717 059901 40 6 05 ...
Page 148: ...Model C717 059901 58 6 05 ...