Figure 52
#IRCULATORZONINGWITHHIGHANDLOWTEMPERATURE
HEATINGZONES
Part number 550-142-850/0115
43
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
17
Primary/Secondary System Piping
(continued)
Circulator zoning – Multiple
temperature zones with
primary/
secondary
(Shown with optional DHW piping)
See Figure 52
.
1.
4HISCONlGURATIONISFORCIRCULATORZONEDSYSTEMS
with
high- and low- temperature
heating zones
using a boiler loop connected as a secondary circuit
OFFOFAPRIMARYSYSTEMLOOP3YSTEMSZONEDWITH
circulators must pipe the boiler loop as a secondary
circuit as shown.
2. Install a separate circulator (supplied by installer)
FOREACHZONECAPABLEOFDELIVERINGTHEPROPERmOW
and head as shown.
Expansion Tank required
1.
0ROVIDE A SYSTEM EXPANSION TANK FOLLOWING THE
guidelines on pages 37 or 39.
2.
DO NOT
USEACLOSEDTYPETANKIFCONNECTINGTOA
boiler that is equipped with an automatic vent.
System setup and settings
1.
(ITEMPEMITTERSMAYBEBASEBOARDSRADIATORSFAN
coils, or heat exchangers.
2. Add a mixing device (Figure 52, item 28) to help
ensure supply water temperature will not exceed
THEMAXIMUMALLOWABLEFORTHERADIANTSYSTEM
3. Heating zone supply water temperature settings
SHOULD BE SELECTED FOR THE HITEMP ZONES 4HE
mixing device regulates supply temperature to the
lower-temp zones.
Domestic Hot Water (DHW) tank, if used
1.
$(7 DIRECT CONNECTION0IPE FROM THE NEAR
BOILERPIPINGTOTHE$(7TANKSBOILERCONNECTIONS
as shown.
2. DHW as zone—A DHW tank can be connected as
AZONEIFA$(7TANKIS
NOT
already connected to
the boiler.
To provide DHW priority operation, use
a zone controller. See notices on page 51 to ensure
compliance with the 2007 Energy Act.
3. DHW Priority operation—The
FreeStyle
™
control
TURNSOFFSPACEHEATINGTOTHE(%!4ZONESDURING
domestic water heating calls on the DHW input.
4HE -!8 /. 4)-% SETTING CAN BE ADJUSTED TO
LIMITHOWLONGTHISOCCURS3ETTHE-!8/.4)-%
to “0” to disable domestic priority. See page 61
FOR
setting instructions.
4.
)F
NOT
connecting an indirect water heater, do not
use the DHW input or DHW Circulator output on
the
FreeStyle
™
control.
/VERRIDINGTHE/UTDOOR 2ESETFUNCTIONBY
connecting space heating zones to inputs
ANDOUTPUTSINTENDEDFOR$(7APPLICA
-
tions may violate
Section 303 of the 2007
Energy Act.
See page 119
FORCOMPLIANCE
INFORMATIONANDEXEMPTIONS
Wiring the Indirect tank aquastat to the Heating Only Boiler,
REFERTO3ECTION&IELD7IRING
Controlling the Zones
1.
The
FreeStyle
™
control can be used to control space heating only,
domestic water heating only, or both.
2. The boiler and circulators can also be operated by a zone controller
and in some installations may be needed.
(See Note,
page 42)
