lp-585 Rev. 000 Rel. 001 Date 9.10.18
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The circulating pump becomes very hot when running. Allow
sufficient time to cool before touching. Failure to do so can lead to
personal injury.
F. Solar System Pump
Solar pumps must be installed at least 3’ below drain back tank level.
Remove integral check if so equipped. The solar system pump must
be sized to lift water to the top of the collector array. The solar pump
must be sized for proper flow and head loss. Friction losses must also
be considered when sizing a pump and solar system piping.
When sizing the pump, determine the head losses (also called psi, head
feet, and foot lift). Determine head loss through piping and the heat
exchanger using the solar collector manufacturer’s recommended
flow rates. Consider the vertical lift from the drain back tank to the
top of the solar panels. Size the pump for whichever is greater: Head
loss pumping through the system, or vertical lift, not both. A solar
modulating pump control is highly recommended on a drain back
system.
If the pump continues pumping at full speed rate after the system
is primed, the solar loop will often be over-pumped and the
recommended velocity will be exceeded. This condition will lead to
premature failure and reduced performance of the solar system.
G. Electrical Installation
ALL CONNECTIONS MUST BE MADE IN ACCORDANCE WITH LOCAL
ELECTRICAL CODES. A qualified electrician or contractor is required to
install a 115-120VAC duplex receptacle adjacent to the solar storage
tank. This receptacle is used to supply power to the pump/control
combo.
H. Installing the Drain Back Tank Sight Tube
IMPORTANT NOTE:
A sight tube has been included with the solar
drain back tank. The sight tube allows service technicians, installers,
and users to quickly determine proper drain back system drainage and
solar system heat transfer fluid level.
It is extremely important that this sight tube be installed BEFORE
filling the solar water heating system. Failure to install the sight tube
will result in a spillage of heat transfer fluid, which, depending on
your system, may or may not contain antifreeze. Property damages
due to failure to install the sight tube ARE NOT covered by product
warranty.
1. Fit one (1) clamp on the solar drain back tank sight tube. Move the
clamp about two inches down the sight tube.
2. Fit the drain back tube onto the top sight tube fitting. See Figure 5.
Figure 5 - Brass Drain Back Sight Tube Fitting
3. Move the clamp over the tube and onto the sight tube fitting. This
will secure the tube to the fitting. See Figure 6.
4. Fit one (1) clamp on the other end of the solar drain back tank sight
tube. Move the clamp about two inches down the sight tube.
Figure 6 - Sight Tube Secured to Brass Fitting
NOTE:
If the fitting was offset, use an adjustable wrench to straighten
it back up.
7. After the solar water heating system has been piped, check the
drain back sight tube and fittings and repair any leaks.
5. Fit the drain back sight tube onto the bottom sight tube fitting. It
may be necessary to use an adjustable wrench to offset the fitting.
This will ease securing the drain back tank sight tube to the fitting.
6. Move the clamp over the tube and onto the sight tube fitting. This
will secure the tube to the fitting. See Figure 6.
Summary of Contents for Drain Back
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