Install Water Piping - Weil-McLain ECO 70 Manual

TM -
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AS FIRED WATER BOILER

Install water piping

Use two wrenches when tightening water piping
at boiler, using one of the wrenches to prevent
the boiler interior piping from turning. Failure to
support the boiler piping connections to prevent
them from turning could cause damage to boiler
components.
General piping information
The ECO control uses temperature sensors to
provide both high limit protection and modulating
temperature control.
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 constructed to
prevent a temperature setting 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.)
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.
perature-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 56 for wiring information.
3. If using a manual reset limit control or wiring in the manual
reset circuit, set ECO control boiler limit at least 20°F less
than the external manual reset limit (i.e., set ECO control no
higher than 180°F for a 200°F external limit, for example).
1. Use backflow preventer in the cold water supply piping if
required by local codes.
System/zone pipe sizing
1. For residential space heating applications (other than radiant
heating or unit heaters) ONLY, you can use the sizing sug-
gestions in Figure 40.
36
— Boiler Manual
Recommendations are based on a 20°F temperature drop
through the system.
. Some codes/
Size zone circulators to handle the required flow and head
loss for each zone.
System water piping methods
— If the heating sys-
— If using tem-
1.
2.
3.
Using primary/secondary piping will provide the most efficient
and reliable operation of the boiler and the heating system.
1. Use information beginning on page 42 to size pump for
2. Reference suggested piping layouts on pages 47-49.
Suggested pipe sizing for system headers
and zone piping — RESIDENTIAL with
baseboard, convectors or cast iron radiators
ONLY (20°F temperature rise)
Model
70/110
155
Suggested maximum load per zone
Copper pipe and Maximum recommended
baseboard size
¾"
1"
It is recommended, but not required, to use
primary/ secondary piping to the boiler. Using
primary/secondary piping will provide the most
efficient and reliable operation of the boiler and
the heating system.
Read the NOTICES and guidelines beginning on to deter-
mine if the system is eligible for this piping strategy.
If eligible, reference suggested piping layouts on pages 41
and 42.
Use primary/secondary piping if system ineligible.
proper flow through the ECO boiler.
Some installations can be piped in numerous other
ways that will work equally as well as the sugges-
tions here.
System header
1" or larger
1¼" or larger
feet of baseboard
67
104
Part number 550-142-122/0513