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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 Larger than normal amounts of air released at hot water fixtures
Evidence of leakage or scaling at collector air vents or vacuum
breakers
Symptoms of an airbound storage loop in closed loop and drainback systems are:
No evidence of flow in a flow meter, although the pump is operating
normally otherwise
Higher than normal pump temperatures
Collector feed and return lines are both at a high temperature on a
sunny day, but the two sides of the storage loop are both at about
room temperature (the storage pump may be heating the piping
somewhat)
High points in storage piping without functional air vents
Collector loops in drainback systems do not become airbound. However, if the
reservoir tank for the collector loop does not have enough water, the collector loop
pump cannot move water through the collectors. The symptoms are:
Low water level in a sight glass
No evidence of flow in a flow meter, although the pump is operating
normally otherwise
Higher than normal pump temperatures
Collector feed and return lines are both about room temperature on a
sunny day, although the pump in operating normally otherwise (the
pump may be heating the feed line somewhat)
No temperature difference between the two sides of the storage loop
(this may also indicate an airbound storage loop)
Pump damage, in extreme cases when no water is left in the loop
TROUBLESHOOTING
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4.3 TROUBLESHOOTING OPERATIONS
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