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Section 6 - System Installation
HEATING MULTIPLE ZONES OR BUILDINGS
A single pump and manifold may be used to heat
more than one zone as long as the return water can be
maintained above 150°F (66˚C). If the return water
temperature can not be maintained above 150°F (66˚C),
then a separate pump should be used for each zone. A
thermostatic bypass valve must be installed to ensure
that the water temperature in the outdoor furnace is
maintained above 150˚F (66˚C).
If a manifold is used, a swing check valve (p/n 296)
should be installed in the line at the outlet of the pump.
The swing check valve must be installed in a vertical
position with the direction of flow as designated by
the arrow on the swing check valve. This will prevent
reverse circulation and loss of heat on multiple zones if
one pump fails. Hose bibs (p/n 199) should be installed
on each supply and return manifold to allow for purging
air from the zones.
The Maxim offers two sets of outlets (for up to two
zones or buildings without the need for manifolds)
for mounting up to two pumps. Fig. 35 illustrates one
possible configuration.
NOTE: If the outdoor furnace is unable to
maintain a water temperature of 150˚F (66˚C)
or higher, inspect the thermostatic valve and
replace if necessary.
NOTE: A properly-sized backup furnace or boiler
should be configured to provide heat if the
outdoor furnace is out of fuel or the heat load
exceeds the capacity of the outdoor furnace.
Heat for Multiple Buildings
Fig. 35
