Freestyle 2 Series Manual page 36

FreeStyle
®
2
series
17 Install water piping
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.
• Cleaning- refer to the installation manual maintenance
section for the proper cleaning procedure for the plate
DHW heat exchanger, and the required cleaning frequency.
Figure 46
Domestic Piping - Brazed Plate Heat
Exchanger - Ports 2 and 4
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.
This boiler is NOT intended for connection with a
refrigeration system.
36
-
wall mount gas fired water boiler
(continued)
–
boiler manual
General piping information
Additional controls, if required
The control uses temperature sensors to provide
both high limit protection and modulating
temperature control.
function requires manual reset
jurisdictions may require additional external
controls for high limit and/or low water cutoff
protection.
Additional limit controls
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.)
Multi-temperature systems
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.
Low temperature systems
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).
Backflow preventer
Use backflow preventer in the cold water supply piping if
required by local codes.
System/zone pipe sizing
(Baseboard, convectors or cast iron radiators ONLY)
For residential space heating applications (other than radiant
heating or unit heaters) ONLY, you can use the sizing suggestions
in Figure 47, page 37.
The control's high limit
. Some codes/
— If the heating sys-
— If using temper-
Part number 550-142-950/0122