Refrigerant Charge/Recharge; Thermal Expansion Valve (Txv); Hot Gas Defrost Valve - Cornelius I-SERIES Training Manual
For model numbers beginning with iac, iwc, or irc carbon dioxide water syrup/concentrate mechanical refrigeration controls & electrical
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Also See for I-SERIES:
- Use and care manual (14 pages) ,
- Training manual (58 pages) ,
- Installation instructions (3 pages)
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I-Series Ice Machine Training Manual
NOTE: Never judge the thickness of the ice from the first batch of the ice pro-
duced — the first cycle is a balance cycle. Always wait for the second
cycle before making any adjustments.
Refrigerant Charge/Recharge
The refrigeration system is critically charged to within ± 1/2 ounces (14.8 ml), and
does not use an accumulator. DO NOT use gauges until all other tests have been per-
formed. Time the freeze cycle and refer to the charts in the I Series Ice Cube Machine
Service Manual & Maintenance Guide.
NOTE: If water is leaking from the dump valve, warm water is introduced which will
increase freeze time.
After conducting all other tests attach gauges and
check head and suction pressures.
The ice machine should freeze within ± 10% of the
times indicated in the service guide. If the times are
longer, find and fix the leak. Then evacuate and
recharge the system BY WEIGHT.
NOTE: The R404A refrigerant used in the I-Series ice machines is a blend of several
refrigerants. These can fractionate in the refrigeration system. This is why it
is so important to completely evacuate the system before recharging.
NOTE: Always recharge R404A systems in a liquid state (not in a gas state).
NOTE: ALWAYS install a new dryer whenever the refrigeration system has been
opened (replace with an EK 404A dryer).
Thermal Expansion Valve (TXV)
Check the TXV by disconnecting the capillary valve
from the suction line. Warm the bulb in your hand
and watch to see that the valve opens and the suction
pressure gauge increases. Cooling the bulb closes the
valve.
Hot Gas Defrost Valve
Check that the Hot Gas Defrost Valve is not leaking
during the freeze cycle.
NOTE: The best way to detect a small weeping hot-
gas valve, use an electronic sight glass.
Alternately, touch the outlet line. If it is warm/hot, it is leaking.
- 12 -
Test
ports
Bulb
Thermal Expansion Valve
Hot gas
defrost
valve
© 2001, IMI Cornelius Inc.
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