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Figure 54
Figure 54.
1 AquaBalance® wall mount boiler
2 Indirect Water Heater, if used
3
Relief valve, field piped — MUST be piped to boiler return
connection on Combi boilers, Heating Only boilers relief
valve field 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 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,
(field supplied), 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
Zone Valve zoning – primary/secondary
(Shown with optional DHW piping)
See Figure 54.
1. This configuration is for zone valve systems using a boiler
loop connected as a secondary circuit off of a primary system
loop. Systems whose flow 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 flow 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—The control turns off space heating
to the HEAT zones during domestic water heating calls on the
DHW input. The 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 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
Boilers, refer to Section 2 - Field Wiring.
Controlling the Zones
1. The control can be used to control space heating only, domestic
water heating only, or both. Refer to field wiring, beginning
on page 53, for instructions on wiring to zone valves.
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.
Use isolation relays if connecting 3-wire zone
valve end switches to the HEAT input.
Part number 550-100-325/0419
43
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
18 Primary/Secondary System Piping (continued)
(See Note,
page 44)
not run in
DHW mode
on Heating
Only Boil-
Do not
install
on
Combi
Boil-
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