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H. Discharge pressure too high
Problems and symptoms
Too little or too warm condenser air.
Restricted air flow.
Excessive discharge pressure.
J. Discharge pressure too high
Problems and symptoms
Bubbles in sight glass.
K. Discharge pressure too high
Problems and symptoms
Compressor runs continuously.
Abnormally cold suction line; liquid
flood-back to compressor.
L. Discharge pressure too high
Problems and symptoms
Bubbles in sight glass.
High pressure drop across
filter-drier.
No refrigerant flow through
expansion valve.
Loss of capacity.
Superheat too high.
This is by no means a complete analysis of the scroll
refrigeration system. Instead, its intention is to familiarize
the operator with the operation of the scroll unit and
Trouble Analysis
Probable cause
Excessively warm air leaving
condenser.
Cuts out on high pressure control.
Air or noncondensible
gas in system.
Probable cause
Lack of refrigerant.
Probable cause
Excessive load on evaporator
a) Expansion valve opens too far.
b) Expansion valve stuck in open
position.
Probable cause
Lack of refrigerant.
Clogged filter drier.
Expansion valve power element has
lost charge.
Obstructed expansion valve.
Too much pressure drop in
evaporator.
provide the background necessary for him to recognize
and accurately correct or report any developing problem.
17
Recommended action
Clean coil, check fan and motor
for proper operation.
Remove air or non condensibles.
Recommended action
Repair leak and charge.
Recommended action
Check system.
a) Adjust superheat and check
bulb attachment.
b) Repair or replace.
Recommended action
Repair leak, add refrigerant.
Replace.
Replace valve power element.
Clean or replace .
Check external equaliser of
expansion valve.
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