2
ASDI
Installation, Operation and Maintenance Manual
– SECOND SUN – P/N 51856
A solid state thermo-electric generator provides power to operate the tank heater controls. Electrical power is
generated by the temperature differential between the heater and the ambient air. The small finned aluminum
heat exchanger cools one side of the EMF generating device, and the heater provides heat to opposite side. The
heat exchanger must remain exposed and unobstructed. A common “flame type” thermocouple does not function
in this application because there is no pilot flame.
The
SECOND SUN™
is a
“staged” heater consisting of a smaller portion called the “pilot” heater and a larger
sec
tion called the “main” heater. These two sections are both contained within the overall heater and cannot be
seen without removing the catalyst material. The pilot heater is used to start the catalyzing process with a limited
energy source such as a 12V car battery, and to allow the heater to ramp down when main heat is not necessary.
In cold environments our testing has shown that the
SECOND SUN™
performs best when the pressure setting
corresponds to a saturation temperature above 32 F (55 psi for propane) is preferred. When set below this point
ice formation may impede the heater performance when the main heater cycles off for long periods.
When not needed during the summer, we recommend the unit be shut off. Before restarting the unit in the fall, the
catalyst material should be visually inspected to make sure rodents have not entered and degraded the material.
At the same time, the tank surface covered by the heater should be inspected for corrosion, using the same
method used for inspecting all other exposed surfaces.
12V power
connections for
cold start only.
Thermoelectric generator
Heat Exchanger.
Gas Inlets
