ESIE11-02 Maintenance
Part 5 – Maintenance 5–5
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Expansion valve The expansion valve will allow the correct amount of refrigerant to enter the evaporator to match the
cooling load (by keeping a constant superheat). Follow the instructions below to check the expansion
valve.
■ Check the superheat setting.
■ Inspect the bulb / power-head capillary connection (no chaffing).
■ Inspect the equaliser line visually.
■ Inspect the feeler bulb suction pipe connection / insulation.
Flow switch and
pump interlock
Follow the instructions below to check the flow switch and the pump interlock.
■ Check operation by ohmmeter after disconnecting the wires to the field terminals and simulating
flow and no-flow conditions.
■ Inspect the flow-switch for possible corrosion (glycol applications). Check electrical connections for
shunts or bridges.
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