Specifications

www.aetsolar.com Open Loop / PV - Page 20

INSUFFICIENT HOT WATER

If insufficient hot water is available a system malfunction may not be indicated. A low amount of solar

radiation or heavy water demand can be the cause.

If no excessive demands are put on the system and ample solar radiation is available, the system should

operate properly. The pump should run each sunny day until a full supply of hot water is stored. If the

pump does not run, there is a problem on the electrical end of the system. Either the pump, controller, or

sensors are malfunctioning. The controller can be bypassed by running a power cable directly to the

pump and checking its function separate from the control system. Make sure that the problem is not a

blown fuse or a tripped breaker. If the pump runs normally when powered externally, the control circuit is

the problem area. Eagle Sun controllers use thermistor sensors to determine modes of operation. A

controller tester is available from AET for checking differential function. Check sensor wiring. If no faulty

wiring can be discovered, replace sensors.

If the pump is running all the time, even when the collectors are cool, then the storage sensor or collector

sensor may be open. It is also possible that the sensor wire itself is at fault. To check this, test the

continuity with an ohm meter. Be sure to disconnect the sensor when performing this test. Test the wire

with both ends open, then retest often twisting the 2 sensor wires together at one end. The system can

be set on a timer or switched on manually until the controller is properly functioning.

CONDENSATION ON COLLECTORS

If condensation occurs inside the collectors, ¼” vent holes should be drilled in the lower side of the

collector. Three holes should be drilled, one at each end of the bottom of the collector and one in the

center. These holes should be drilled 1” from the base of the collector

This should clear up any condensation within three days.