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Part number 550-100-325/0419
36
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
17 Install water piping (continued)
This boiler is NOT intended for connection with a
refrigeration system.
General piping information
The control uses temperature sensors to provide
both high limit protection and modulating
temperature control.
. Some codes/
jurisdictions may require additional external
controls for high limit and/or low water cutoff
protection.
Following standard industry practices, if installation is to com-
ply with ASME or Canadian requirements, an additional high
temperature limit may be needed. Consult local requirements
for other codes/standards to determine if needed.
1. Install a manual reset high temperature limit to prevent a
temperature above 200°F in system supply piping between
boiler and isolation valve. (Note that the control operating
limit function shuts the boiler down at 195°F, or lower if set
to a lower value.)
— If the heating sys-
tem includes circuits that require lower temperature
water (radiant slab circuits, for example) as well as
higher temperature circuits, it is recommended to
protect low temperature circuits with limit controls
that are wired to the control external limit circuit
terminals.
— If using temper-
ature-limited materials (such as PEX tubing) in
system piping, it is recommended to protect the
system with limit controls that are wired to the
controls external limit circuit.
2. See instructions beginning on page 52, for wiring information.
3. If using a manual reset limit control or wiring in the manual
reset circuit, set boiler control limit at least 20°F less than the
external manual reset limit (i.e., set control no higher than
180°F for a 200°F external limit, for example).
Use backflow preventer in the cold water supply piping if
required by local codes.
System/zone pipe sizing
For residential space heating applications (other than radiant
heating or unit heaters) ONLY, you can use the sizing suggestions
in Figure 47, page 37.
Studies have indicated that dangerous bacteria
can form in potable water distribution systems
if certain minimum water temperatures are not
maintained. Contact local health department for
more information.
Figure 46
Hard Water- To prevent the formation of scale on the inside
of the plate DHW heat exchanger and other components in
the domestic hot water system, water with hardness higher
than 50 ppm Calcium Carbonate must be treated with a
“Water Softener” prior to entering the boiler. Plugging of the
domestic system by scaling or accumulation of dirt is not
the responsibility of Weil-McLain, and suitable steps must
be taken to avoid it.
section for the proper cleaning procedure for the plate
DHW heat exchanger, and the required cleaning frequency.
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