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Figure 11|The Fixed Point
A fixed point should be identified as a point where the thermal expansion
moves away from. On the Fix-Mounted Panel, a fixed point in-
sert (PN10209) should be used on one header anchor per bank. This
will keep the Panel at the center point of bank movement. The header anchor
has a special insert to hold the header in place. A means of limit-
ing plumbing movement should be used which best fits the practices of the
installation company. Refer to Appendix C.
Note: Narrow Panels (2ft wide) can be useful on
roofs where there are multiple obstacles to avoid
and standard size Panels don't fit.
1. Once all Panels have been positioned with clear-
ance, finish plumbing the Panels as described in
Phase I — Mounting Panels and Connect Supply
and Return Lines.
2. After turning on the system, ensure the banks
have not moved too close to obstacles and address
as needed.
3. Once fitment is verified, finish mounting by adding
mid-bank roof penetrations by centering with the
system running.
4. The Panels may then be strapped down with Panel
body straps. Do so by starting on one side of the
bank, tightening down the strap with the Strap
Anchor and working through the bank one strap
at a time. Note: Panel straps should be installed
with a mild amount of tension so as to not be
exceptionally loose. If necessary, let slack into
the series and repeat. Do not install strapping
around lower headers. Panels need to move up
and down the roof with temperature fluctua-
tions.
VRV & End Caps
Install a Vacuum Relief Valve (VRV) by plumbing up
with a "TEE" fitting on the return line from the highest
bank. See the Panel to VRV section of Figure 4 for an
assembly schematic. Only one is necessary for each
PHASE II — System Installation Detail Cont'd
roof pitch in a typical system and should be installed
on the highest bank. Note that it's permissible to in-
stall the VRV so that it functions as an end cap for
the opposing corner of the bank and that there are
fewer parts involved if doing so this way. The primary
reason for "Teeing" up the VRV is that it will likely be
less prone to failure from sediment buildup during
operation. Systems with rows on multiple roofs re-
quire an additional VRV for each pitch.
Install End Caps to seal headers opposite the supply
and return connections.
Diverter Valve
The Diverter Valve is the "on switch" for the solar sys-
tem. It should be set to both allow and prevent flow
into the solar system (shown in Figure 12) and installs
in the pool plumbing as detailed in Figures 26-29 of
Appendix E.
An actuator will be needed when automating a solar
system. Follow the procedure specified by the manu-
facturer of your actuator. By positioning the valve as in
Figure 12, the actuator cams can be left 180° apart, as
provided by the manufacturer.
See Appendix E for detailed alternate Diverter Valve
placements and types.
The 2877 Jandy Pro Series non-positive diverter valve,
or equivalent is recommended along with a pool auto-
mation system of choice.
When installed as specified by FAFCO
ification of diverter valves or actuators is neces-
sary.
A
Figure 12 | Diverter Flow
Diverter Valves should be set to allow two flow options. One design option is
depicted. Alternate methods are outlined in Appendix E.
A) System Off, Leaving all three paths open B) System On, Closing the path
on the To Pool side. (In some cases, plumbing the Diverter with a Neutral flow
position (depicted) can allow partial flow to the solar and overheat the pool.
Consult your local install department or FAFCO
®
Inc. no mod-
®
B
®
for further details.)
20
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