S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
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Refrigeration System Section 7<br />
ANALYZING DISCHARGE PRESSURE<br />
DURING FREEZE OR HARVEST CYCLE<br />
Procedure<br />
1. Determine the ice machine operating conditions:<br />
Air temp. entering condenser ______<br />
Air temp. around ice machine ______<br />
Water temp. entering sump trough ______<br />
2. Refer to Operating Pressure Chart for ice machine<br />
being checked.<br />
Use the operating conditions determined in step 1 to<br />
find the published normal discharge pressures.<br />
Freeze Cycle _______ Harvest Cycle _______<br />
Freeze Cycle Discharge Pressure High Checklist<br />
Freeze Cycle Discharge Pressure Low Checklist<br />
NOTE: Do not limit your diagnosis to only the items listed in the checklists.<br />
3. Perform an actual discharge pressure check.<br />
Freeze Cycle<br />
PSIG (kPa)<br />
Harvest Cycle<br />
PSIG (kPa)<br />
Beginning of Cycle __________ __________<br />
Middle of Cycle __________ __________<br />
End of Cycle __________ __________<br />
4. Compare the actual discharge pressure (step 3) with<br />
the published discharge pressure (step 2).<br />
The discharge pressure is normal when the actual<br />
pressure falls within the published pressure range for the<br />
ice machine’s operating conditions.<br />
Possible Cause Check/Correct<br />
Improper installation See “Installation/Visual Inspection Checklist”<br />
Restricted condenser water flow Low water pressure [20 psi (138 kPa) min.]<br />
High inlet water temperature (90°F/32.2°C max.)<br />
Dirty condenser<br />
Dirty/defective water regulating valve<br />
Water regulating valve out of adjustment<br />
Improper refrigerant charge Overcharged<br />
Non-condensables in system<br />
Wrong type of refrigerant<br />
Other Non-<strong>Manitowoc</strong> components in system<br />
High side refrigerant lines/component restricted (before mid-condenser)<br />
Possible Cause Check/Correct<br />
Improper installation See “Installation/Visual Inspection Checklist”<br />
Improper refrigerant charge Undercharged<br />
Wrong type of refrigerant<br />
Water regulating valve Out of adjustment<br />
Defective<br />
Other Non-<strong>Manitowoc</strong> components in system<br />
7-12 Part Number 80-1634-3
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