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We recommend the use of a 115 volt differential
control with a factory installed six foot line cord. The
installation requires one 115 volt outlet to be installed
near the solar storage tank. Plug the control into the
outlet. The circulation pump line cord is plugged into
the receptacle on the side of the controller. A 230 volt
control and circulation pump may be substituted, but
troubleshooting the components in the future becomes
more difcult.
4.11 Charging the System
!
WARNING: Under no circumstances can any
fluid other than Dowfrost HD be used, alternate
fluids could be hazardous to your health.
Once the components are plumbed you are ready to
ll the solar storage tank with water and to charge
the collector loop with a mixture of heat transfer uid
(HTF) and distilled or deionized water. The use of
collector in the summer months or under stagna-
tion conditions can melt this type of material.
Any above ground exterior pipe insulation is sub-
ject to UV degradation and must be wrapped
with foil tape or painted with two coats of high
quality water-based acrylic resin coating as sup-
plied by the insulation manufacturer. Rubatex
UV Protective Coating or equal is the required
coating material.
4.5 Collector Plumbing
SunEarth requires the use of all copper and brass
fittings in the collector loop plumbing.
Couplings rather than unions should be used to
join the collectors to avoid leaks and fluid loss.
Use only lead-free solder. Engelhard Silvabrite
100 or equal is required. Use of 50/50 lead sol-
der is expressly prohibited. Use of galvanized
steel, CPVC, PVC, or any other type of plastic
pipe is prohibited.
Piping in new solar installations can be covered
with dirt, grease, solder flux or other impurities
that over time affect the quality of the glycol HTF.
A thorough cleaning is required before charging
the system with glycol. Carefully review the
cleaning procedures in "Charging The System"
outlined below.
All vertical piping between the storage tank and
the collector shall be supported at each story or
at maximum intervals of ten feet (10'). Copper
plumbers tape or tube strap is required. The pipe
insulation may not be compressed or crimped by
the strapping material.
The installation of all horizontal and vertical pip-
ing may not reduce the performance or rating of
any structural member or fire rated assembly.
Adhere to all applicable local codes and ordi-
nances.
4.6 Collector Sensor Placement
The collector sensor must be located on the hot
water return line as close to the collector as pos-
sible. Sensors are typically accurate to +/- 1/2°F
if properly installed and weatherized. To maxi-
mize sensor accuracy, attach the flanged portion
of the sensor to the SunEarth collector header
pipe with a stainless steel hose clamp. Wire nuts
used to connect the sensor and low voltage
wiring shall be all plastic, sealed with silicone and
thoroughly wrapped in electrician’s tape.
P .7
fig.14
fig.15
fig.13
COLLECTOR
SENSOR
COLLECTOR PLUMBING - VERTICAL MOUNT
COLLECTOR PLUMBING - HORIZONTAL MOUNT