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Tightening and Sealing Frames
If the connections between frame components are sound, use silicone sealant to
weatherproof them. If joints are loose and can be tightened, apply silicone to the
surfaces before tightening the collector frame.
Use stainless steel, cadmium-plated or aluminum hardware for repairing aluminum
frames. Do not use galvanized hardware. Contact with zinc will corrode aluminum
within one year.
Painting Frames
The frames of some older styles of collectors are made of mild steel.  If these are
rusting, remove the corroded material with a wire brush and repaint the frame.
Seals and Gaskets
If the glazing gasket is leaking, but the glazing is not broken, apply silicone sealant
to suspicious spots (Figure 6-2). Make sure the collector surfaces are clean and
dry.
FIGURE 6-2
Resealing a Collector
with Silicone Sealant
Leaks around the absorber headers can be repaired the same way. Make sure the
headers are not too warm. The silicone tube will list the highest application
temperature. Replace the piping insulation.
MAINTENANCE
204
6.1 MAINTENANCE PROCEDURES





 


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