In some low-floor neighborhoods, solar water heater piping is basically piped from the duct. This structure of the low-floor houses, often appear to install solar electric heating trace cable tape mix and match phenomenon. Because most of the solar water heater will be erected on the roof, the phenomenon of mix and match general users will not be easy to find. Resulting in solar electric heaters after the fire, do not know what the cause. The following summarizes a few serious mix and match problems, for users' reference:
First, some developers in order to save trouble, the whole unit of solar energy tube share a heat preservation layer, and from a common duct go tube. If the installation of solar energy electric heat tape tracing cable, this practice will cause electric heat tape cross, uneven heat, fire and other problems occur. The correct practice is: a solar tube corresponds to a electric heat tape, and independent installation of insulation layer; to avoid the electric heat tape in the air duct mutual intersection, accompanied by uneven heat and fire.
Second, the roof of the solar electric tropical wiring exposed, no good waterproof insulation measures or no insulation treatment at all; resulting in electric tropical leakage, and other cables occur and fire. The correct practice is: do a good job at each junction of the waterproof insulation treatment, also do not put the joints into the duct; and install leakage protection or open.
Third, the solar electric heating tape cable and piping when affixed, tied more tightly, not in the necessary place to leave an appropriate margin. Tropical and solar pipe thermal expansion and contraction degree is not the same; when the pipe meets the hot water heated thermal expansion and contraction phenomenon occurs, it will lead to tropical pull off or cut off the heat; pull off, the exposed metal wires are also prone to danger. The correct approach is: the electric heat tape parallel to the solar tube, can be fixed can, should not be too tight; necessary places can leave an appropriate margin to prevent thermal expansion and contraction phenomenon, and the installation of insulation.
Fourth, the use of ordinary transparent tape binding, overheating or short-circuit caused by fire; ordinary transparent tape does not have flame retardant and temperature-resistant properties, adhesive surface will melt when hot. The correct practice is: not to use ordinary transparent tape binding, choose to have high temperature resistance, corrosion resistance, flame retardant electric tropical special pressure sensitive adhesive tape or aluminum foil tape fixed.