DXR Drainback
Page 26
FLUID QUALITY
This system uses water as a heat transfer fluid media in the solar loop.
“No other fluid shall be used that would change the original classification of this system. Unauthorized
alterations to this system could result in a hazardous health condition.”
HAZARDS
Solar collectors become very hot when in direct sun with no fluid being circulated through them. Extreme caution
should be taken when standing near, or handling solar collectors in this state.
The circulating pumps become very hot when running. Always allow at least 30 minutes for the pump to cool down
before touching the pump.
Relief valves may discharge fluids at high temperature and/or pressure.
FLUID SAFETY LABELING
Included with your EagleSun drainback system is a set of labels which describe the component function. These
labels are necessary to alert the owner of potential hazards. These labels are affixed by string/wire tie (on valves)
and/or “peel-and-stick” (on pipe insulation). All labeling must be in place at final inspection. Label examples are as
shown on the following page.
FLUID SAFETY LABELING:
Valve “A”
– this label is affixed to
the system fill/drain valve at the
lowest point in the solar plumbing
loop.
The heat transfer fluid is
introduced here. When properly
charged, the fluid level should be
approximately ¼” from the top of
the sight glass, on the drainback
reservoir.
Valve “B”
– this label is affixed to
the temperature and pressure relief
valve on top of the water heater.
The valve is preset to open and
discharge if either a high pressure
or high temperature situation occur
in the water heater.
Valve “C”
– this label is affixed to
the pressure relief valve on the
drainback reservoir.
This valve is normally closed and
may open and discharge if high
pressure occurs in the collector
plumbing loop.
Valve “D”
- this label is affixed to
the cold water supply, “shut-off”
valve.
This valve is normally open and
should
only
be closed when
maintenance is performed on the
system. Power should be
disconnected, at the circuit
breaker, prior to service.
