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Revision Date: 02/07/2020
Revision: C
Pre-Assembled Rhino - Installation Manual
Manifold/Header Plugs
Automatic Drain Down
All Solar Systems should be installed in a manner that will allow the water to drain automatically and
completely, each and every time the pump is switched “OFF”. This is extremely important
as water left in the
system can cause a variety of issues that may affect the integrity of your system. This is especially important in
areas subject to freezing conditions.
If the system cannot be designed to automatically drain down (possibly due to a unique roof design) then
manual drain down valves should be installed in the plumbing or at the end of the bottom (supply) header. If
this procedure is employed, it is important to train the pool owner in the proper drain-down procedure for
winterising the system.
Systems installed on flat roofs may require additional help when draining down by opening the collector
connections and manually lifting the panel to empty the residual fluid.
Alternatively, you may wish to install a Solar Controller that has an ANTI-FREEZE/BOIL function (such as the
Dontek AS5 or Dontek AS5RTS).
These type of controllers sense when the temperature on the roof reaches the anti-freeze setting (the
temperature at which the system can experience damage from the stagnant water freezing) and will switch
the pump on for 5 minutes then turn off for 15 minutes. It will continue this sequence until the roof
temperature rises above the anti-freeze temperature. It has a similar function to protect the flooded system
from boil damage (damage from the stagnant water over heating).