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Figure 50
:ONEVALVEZONINGPRIMARYSECONDARY
CONNECTIONASYSTEMCIRCULATORISREQUIRED
,%'%.$FOR
Figure 50
.
.OTE
4HISISACOMMONLEGENDFORALLPIPINGDIAGRAMS.OTALL
ITEMSLISTEDAPPEARINEVERYlGURE
1
FreeStyle
™ wall mount boiler
2 Indirect Water Heater, if used
3 Relief valve, supplied with boiler, field piped — MUST be
piped to boiler supply connection — see page 9 for infor-
mation
4 Relief valve piping to drain — see page 40
5 DHW circulator
6 Isolation
valves
7 System
circulator
8 Expansion tank, diaphragm type, if used
9 Air
separator
10 Flow/check valves
11 Purge/drain valves (one drain valve shipped loose with boiler)
12 Auto air vent
13 Zone valves
14 Primary/secondary connection (tees no more than
12 inches apart)
15 Expansion tank, closed type, if used (some chiller
systems may use a diaphragm-type expansion tank)
16 Water chiller
17 Check valve
18 Y-strainer
19 Balancing valve
20 Make-up water supply – Use applicable codes to deter-
mine if backflow preventers, pressure reducing valves,
and fill valves may be required
21 By-pass pressure regulator, REQUIRED for zone valve
systems unless other provision is made
22 High limit temperature control
23 Zone circulator
24 Pressure/temperature gauge, supplied with boiler, field piped
25 Heating circuits
26 Additional heating circuits, if any
27 Boiler circulator,
*
(For Heating Only boilers, In the
Combi boiler the circulator is already inside the boiler
jacket).
28 Mixing valve, if any
Part number 550-142-850/0115
41
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
17
Primary/Secondary System Piping
(continued)
Zone Valve zoning – primary/secondary
(Shown with optional DHW piping)
See Figure 50.
4HIS CONlGURATION IS FOR ZONE VALVE SYSTEMS USING A BOILER
LOOPCONNECTEDASASECONDARYCIRCUITOFFOFAPRIMARYSYSTEM
loop. Systems whose flow characteristics do not comply with
those listed in Figure 47, page 38 must pipe the boiler loop as a
secondary circuit as show.
3YSTEMSZONEDWITH ZONEVALVES-534USEABYPASSPRESSURE
regulator.
)NSTALL A SYSTEM CIRCULATOR SUPPLIED BY INSTALLER CAPABLE OF
delivering the proper flow and head as shown.
Expansion Tank required
0ROVIDEASYSTEMEXPANSIONTANKFOLLOWINGTHEGUIDELINESON
pages 37 or 39.
2.
DO NOT
USEACLOSEDTYPETANKIFCONNECTINGTOABOILERTHAT
is equipped with an automatic vent.
Domestic Hot Water (DHW) tank, if used
1.
$(7DIRECTCONNECTION0IPEFROMTHENEARBOILERPIPINGTO
THE$(7TANKSBOILERCONNECTIONSASSHOWN
2.
$(7ASZONE!$(7TANKCANBECONNECTEDASAZONEIFA
DHW tank is
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
™
CONTROLTURNSOFF
space heating to the HEAT zones during domestic water heat-
INGCALLSONTHE$(7INPUT4HE-!8/.4)-%SETTINGCAN
BEADJUSTEDTOLIMITHOWLONGTHISOCCURS3ETTHE-!8/.
4)-%TOhvTODISABLEDOMESTICPRIORITY3EE
page 61
FORSET
-
ting instructions.
4.
)F
NOT
connecting an indirect water heater, do not use the DHW
input or DHW Circulator output on the
FreeStyle
™
control.
/VERRIDINGTHE/UTDOOR2ESETFUNCTIONBYCONNECTING
space heating zones to inputs and outputs intended
FOR $(7 APPLICATIONS MAY VIOLATE
Section 303 of
the 2007 Energy Act.
See page 119
FORCOMPLIANCE
INFORMATIONANDEXEMPTIONS
Wiring the Indirect tank aquastat to the Heating Only
"OILERREFERTO3ECTION&IELD7IRING
Controlling the Zones
1.
The
FreeStyle
™
control can be used to control space heating
only, domestic
WATERHEATINGONLYORBOTH2EFERTOlELDWIRING
beginning on page 51
FORINSTRUCTIONSONWIRINGTOZONEVALVES
2. The boiler and zone valves can also be operated by a
zone controller.
Connect zone valve end switches to HEAT input.
Connect system circulator to HEAT Circ. output.
5SE ISOLATION RELAYS IF CONNECTING WIRE ZONE
valve end switches to the HEAT input.
(See Note,
page 42)