Heating Multiple Zones Or Buildings - Central Boiler CL 4030 Owner's Manual

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. If the return water temperature
can not be maintained above 150°F, then a separate
pump should be used for each zone. A thermostatic
bypass valve should be installed to ensure that the water
temperature in the outdoor furnace is maintained above
150˚F.
If a manifold is used (as illustrated in Fig. 27), 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
(as illustrated in Fig. 27) to allow for purging air from
the zones.
Fig. 27
Return
p/n Description
108 140,000 Btu Heat Exchanger
118 3/4" Close Nipple
119 3/4" Flange Kit
133 3/4" Tee
154 1/4-hp Blower & Motor
173 009 Pump
198 3/4" Ball Valve
199 3/4" Drain Valve
3/4" Check Valve
296
22
Typical Large System Installation
Thermostatic
Valve
Ball Valve
1-1/4"
Hot Supply from Pump
ThermoPEX on Outdoor Furnace
Thermostatic Valve
Return to
Outdoor Furnace
p/n Description
301 Air Handle Cabinet
380 1-1/4" Male Adapter
395 Manifold
409 1-1/4" Close Nipple
410 1-1/4" Ball Valve
411 1-1/4" Street Elbow
412 1-1/4" x 1/2" Bushing
1330 3/4" x 1" Adapter
Models with side panels offer three sets of supply and
return ports (for up to three zones or buildings, without
the need for manifolds) for mounting of up to three
pumps on the outdoor furnace.
NOTE: If a Taco 014 pump is used, the pump
should be mounted at the base of the outdoor
furnace and a 1-1/4" supply line to the pump
should be used to ensure adequate supply
feed to the pump. See the Hydronic Component
Selection Guide (p/n 2482) for more detailed
information.
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 wood or the heat load
exceeds the capacity of the outdoor furnace.
Suspended Space Heater
Supply
Hose Bib
Section 1 - Furnace Installation
Heat
Exchanger
and Fan
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