Multiple collector systems can be installed in series in non-freezing areas, but in order to drain
the system each collector must have a boiler drain at the inlet connection and a boiler drain or
vacuum breaker at the outlet connection. Never plumb more than two units in series. Plumbing
three or more units in series will greatly reduce the system’s efficiency
(see Drawing P)
.
Supply and return lines for multiple collector systems should be 1 ¼” diameter for systems up to
four collectors, 1.5” diameter for six collectors, 2” diameter for ten collectors. For larger
systems, proper engineers should be consulted.
DRAWING M
TWO UNIT SYSTEM PIPED IN
PARALLEL
OUTLET
RECOMMENDED CONFIGURATION
CAUTION: Pipe between units must be of equal
length between inlet and outlet fittings.
INLET
ALTERNATIVE CONFIGURATION
OUTLET
(THIS UNIT IS FLIPPED OVER SO THE
OUTLET BECOMES THE INLET AND THE
INLET BECOMES THE OUTLET.)
INLET
28
Summary of Contents for PROGRESSIV TUBE
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