60
Troubleshooting
Models C708/C709/C716/C717
Solenoid Valve Failure Troubleshooting
These hot gas units were tested to determine symptoms exhibited by the units when the solenoid valves fail. The
following are the test results.
Barrel Hot Gas Solenoid Valve
a. Stuck Closed:
Will cause a failure of the heat cycle, heat phase.
b. Stuck Open/Leaking:
Will cause a failure of the heat cycle, cool phase.
Product in the barrel will not freeze down to temperature, or if frozen at time of
malfunction will cause poor product quality. The initial draw with compressor off will
be sloppy.
Suction Pressure will be high (about 5 psi [35 kPa] above setting).
Hopper Hot Gas Solenoid Valve
a. Stuck Closed:
Will cause a failure of the heat cycle, heat phase.
b. Stuck Open/Leaking:
Will cause a failure of the heat cycle, cool phase.
Will warm product in the hopper above acceptable level.
Pressures: Suction was 30 psi (207 kPa), discharge was 175 psi (1,207 kPa).
Barrel Suction Solenoid Valve
a. Stuck Closed:
Product will not freeze properly in Auto, and will fail heat cycle.
Compressor Will Fail
Suction pressure dropped to DBV setting and discharge psi also dropped.
Compressor sump temperature rose to 200°F (93°C) in 30 minutes.
b. Stuck Open/Leaking:
Product in barrel will cool while the hopper cools with the beater off. The belt is
squealing, and there is low suction psi.
Will not cause a heat cycle failure but will be an issue after long hopper cooling
period in Standby after heat cycle.
Barrel Liquid Solenoid Valve
a. Stuck Closed:
Product will not freezer down in the Auto mode or cool in the Standby mode.
Compressor Will Fail
Suction pressure was in a vacuum, discharge pressure was 175.
The compressor cut out on internal overload in 9 minutes.
b. Stuck Open/Leaking:
Will fail the heat cycle in the heat phase.
The product will be cold and lumpy, and there will be poor ejection.
Hopper Liquid Solenoid Valve
a. Stuck Closed:
Will fail heat cycle, cool phase. Product will not cool in Auto or Standby modes.
Suction pressure is below DBV setting with hopper only cooling.
b. Stuck Open/Leaking:
Will fail the heat cycle in the heat phase.
In Auto or Standby modes, the hopper product cools to 32°F (0°C).
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 ...