Freestyle 2 Series - Circulator Zoning - Primary;Secondary

Figure 55 Circulator zoning plus optional DHW
piping
NOTE: (Applies to Figures 54, 55 & 56)
Add boiler and tank head loss for pump sizing.
Part number 550-142-950/0122
44
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
18 Primary/Secondary System Piping (continued)
Circulator zoning – primary/secondary
(Shown with optional DHW piping)
See Figure55.
1. is conguration is for circulator-zoned systems using a boiler
loop connected as a secondary circuit o of a primary system
loop. Systems zoned with circulators must pipe the boiler loop
as a secondary circuit as show.
2. Install a separate circulator (supplied by installer) for each zone
capable of delivering the proper ow and head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guidelines on pages
39 or 41.
2. DO NOT use a closed-type tank if connecting to a boiler that is
equipped with an automatic vent.
Domestic Hot Water (DHW) tank, if used
1. DHW direct connection — Pipe from the near-boiler piping to
the DHW tank’s boiler connections as shown.
2. DHW as zone—A DHW tank can be connected as a zone if a
DHW tank is NOT already connected to the boiler. To provide
DHW priority operation, use a zone controller. See notices on
page53 to ensure compliance with the 2007 Energy Act.
3. DHW Priority operation—e FreeStyle® control turns o space
heating to the HEAT zones during domestic water heating calls
on the DHW input. e MAX ON TIME setting can be adjusted
to limit how long this occurs. Set the MAX ON TIME to “0” to
disable domestic priority. See page67 for setting instructions.
4. If NOT connecting an indirect water heater, do not use the DHW
input or DHW Circulator output on the FreeStyle® control.
Overriding the Outdoor Reset function by connecting
space heating zones to inputs and outputs intended for
DHW applications may violate Section 303 of the 2007
Energy Act. See page135 for compliance information
and exemptions.
Wiring the Indirect tank aquastat to the Heating Only
Boiler, refer to Section 22 - Field Wiring.
Controlling the Zones
1. e FreeStyle® control can be used to control space heating only,
domestic water heating only, or both. Refer to eld wiring, begin-
ning on page52, for instructions on wiring to circulators.
2. e boiler and circulators can also be operated by a zone
controller.
LEGEND for Figure 55 and Figure 56 Note: This is a common legend for all piping diagrams, not
all items listed appear in every gure.
1 FreeStyle® wall mount boiler
2 Indirect Water Heater, if used
3
Relief valve, eld piped — MUST be piped to boiler return
connection on Combi boilers, Heating Only boilers relief
valve eld piped on supply.
4 Relief valve piping to drain — see page42
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
(Installer supplied)
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
determine if backow preventers, pressure reducing
valves, and ll 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, eld
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
(See Note,
below)
Note:
Do not
install
on
Combi
Boil-
ers.
Note: This
pump does
not run in
DHW mode
on Heating
Only Boil-
ers.