Freestyle 2 Series - Zone Valve Zoning - Primary;Secondary

Figure 54 Zone valve zoning — primary/secondary
connection — a system circulator is required
LEGEND for Figure 54.
Note: This is a common legend for all piping diagrams, Not all
items listed appear in every gure.
1 FreeStyle® wall mount boiler
2
I
ndirect Water Heater, if used
3
Relief v
alve, eld piped — MUST be piped to boiler
return connection on Combi boilers, Heating Only boilers
relief valve eld piped on supply.
4
Relief v
alve piping to drain — see page42
5 DHW circulator
6
I
solation valves
7
S
ystem circulator
8
E
xpansion tank, diaphragm type, if used
9
A
ir separator
10
Flo
w/check valves
11
Pur
ge/drain valves
(Installer supplied)
12 Auto air vent
13
Z
one valves
14
P
rimary/secondary connection (tees no more than
12 inches apart)
15 E
xpansion tank, closed type, if used (some chiller
systems may use a diaphragm-type expansion tank)
16 Water chiller
17
Ch
eck valve
18 Y-strainer
19 Balancing valve
20
M
ake-up water supply – Use applicable codes to
determine if backow preventers, pressure reducing
valves, and ll valves may be required
21
B
y-pass pressure regulator, REQUIRED for zone valve
systems unless other provision is made
22
H
igh limit temperature control
23
Z
one circulator
24
P
ressure/temperature gauge, supplied with boiler, eld
piped
25
H
eating circuits
26
A
dditional heating circuits, if any
27
B
oiler circulator,
*
(For Heating Only boilers, In the
Combi boiler the circulator is already inside the
boiler jacket).
28 Mixing valve, if any
Part number 550-142-950/0122
43
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
18 Primary/Secondary System Piping (continued)
Zone Valve zoning – primary/secondary
(Shown with optional DHW piping)
See Figure54.
1. is conguration is for zone valve systems using a boiler
loop connected as a secondary circuit o of a primary system
loop. Systems whose ow characteristics do not comply with
those listed in Figure51,page40 must pipe the boiler loop as a
secondary circuit as show.
2. Systems zoned with zone valves MUST use a by-pass pressure
regulator.
3. Install a system circulator (supplied by installer) 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,
beginning on page52, for instructions on wiring to zone valves.
2. e boiler and zone valves can also be operated by a zone
controller.
Connect zone valve end switches to HEAT in-
put. Connect system circulator to HEAT Circ.
output.
Use isolation relays if connecting 3-wire zone
valve end switches to the HEAT input.
Note:
Do not
install
on
Combi
Boil-
ers.
(See Note,
page 39)
Note: This
pump does
not run in
DHW mode
on Heating
Only Boil-
ers.