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Figure 56
Part number 550-100-325/0419
45
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
18 Primary/Secondary System Piping (continued)
Circulator zoning – Multiple
temperature zones with primary/
secondary
(Shown with optional DHW piping)
See Figure 56.
1. This configuration is for circulator-zoned systems with
high- and low- temperature heating zones using a
boiler loop connected as a secondary circuit off of a pri-
mary system loop. Systems zoned with circulators must
pipe the boiler loop as a secondary circuit as shown.
2. Install a separate circulator (supplied by installer) for
each zone capable of delivering the proper flow and
head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guide-
lines 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.
System setup and settings
1. Hi-temp emitters may be baseboards, radiators, fan
coils, or heat exchangers.
For cast iron radiation and old black iron pip-
ing systems a “Dirt separator with a magnet”
must be installed on the return piping to
protect the boiler heat exchanger.
2. Add a mixing device (Figure 56, item 28) to help ensure
supply water temperature will not exceed the maximum
allowable for the radiant system.
3. Heating zone supply water temperature settings should
be selected for the hi-temp zones. The mixing device
regulates supply temperature to the lower-temp zones.
Boiler operation for fan coil only applica-
tions, parameter P02 (page 99) may be set
to 20 for faster “ramp up” to boiler set point
temperature.
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
Boiler, refer to Section 22 - Field Wiring.
Controlling the Zones
1. The 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 control-
ler and in some installations may be needed.
(See Note,
page 44)
This
not run in
DHW mode
on Heating
Do
not in-
stall on
Combi
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