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 Symptoms of an airbound collector loop in a Closed loop system include:
o
Wide pressure fluctuations with temperature changes (in some cases
leading to pressure relief valve blowoff)
o
No evidence of flow by a flow meter, although the pump is operating
normally otherwise
o
A high difference in pressure on each side of the pump, although the
pump is operating normally otherwise
o
Uneven collector temperatures, both from one collector to another,
and hot spots in individual units
o
Higher than normal pump temperatures
o
Collector feed and return lines are both about room temperature on a
sunny day; although the pump is operating normally otherwise (the
pump may be heating the feed line somewhat)
o
Approximately equal temperatures on the inlet and outlet of both the
solar fluid and water sides of the heat exchanger
o
Evidence of leakage at joints or components
o
Fluid in the air chamber of diaphragm type expansion tanks (very
briefly depress schrader valve stem)
Symptoms of an airbound collector loop in a draindown system include:
o
Wide pressure fluctuations with temperature changes (in some cases
leading to temperature and pressure relief valve blowoff)
o
No evidence of flow by a flow meter, although the pump is operating
normally otherwise
o
A high difference in pressure on each side of the pump, although the
pump is operating normally otherwise
o
Higher than normal pump temperatures
TROUBLESHOOTING
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4.3 TROUBLESHOOTING OPERATIONS
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