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Part number 550-100-260/0520
41
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
General piping information
We recommend installing 1" NPT piping unions on boiler
outlet and return to facilitate future service. Pipe unions are
Not included with the boiler.
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 protection.
Some jurisdictions require an additional high temperature
limit. Consult local requirements for other codes/standards to
determine if needed.
1. If required, install a manual reset high temperature limit
constructed to prevent a temperature setting above 200°F
in Boiler In 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
system 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. Please note
that a combi model installed in a low temperature
system is a multi-temperature system.
Low temperature materials — If using temperature-
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 58 for wiring information.
3. If using a manual reset limit control or wiring in the manual
reset circuit, set control boiler 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).
1. A separate low water cutoff is required. See NOTICE above
regarding the inherent protection provided by the Control
module. A low water cut-off is to be supplied by the installer.
2. A 3/4" female NPT port is included within the internal boiler
piping and it is recommended you install a low water cut off
at this location, see Figure 51 .
3. Use a low water cutoff designed for water installations.
Electrode probe-type is recommended.
See Replacement parts section at the end of this manual
for the Weil-McLain low water cut-off kit. When using
kit, ensure extra wire length is neatly bundled with zip ties
and away from internal components.
4. For additional Limit controls wiring, see Field wiring
instructions beginning on page 58 .
Install boiler water piping
Boiler Models System header
80/110 1" or larger
150/199 1¼" or larger
Recommendations are based on a 20°F temperature drop
through the system.
Suggested maximum load per zone
Copper pipe and
baseboard size
Maximum recommended
feet of baseboard
¾" 67
1" 104
Size zone circulators to handle the required fl ow and head
loss for each zone.
Use backfl ow 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 52 .
LWCO 3/4" female NPT port location
Suggested pipe sizing for system headers
and zone piping — RESIDENTIAL with
baseboard, convectors or cast iron
radiators ONLY (20°F temperature rise)
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