Part number 550-100-270/0122
42
ECO
®
Tec series 2 gas-fired water boiler – boiler manual
We recommend installing 1" NPT piping unions on boiler
outlet and return to facilitate future service. Pipe unions are
Not included with the boiler.
e control uses temperature sensors to provide
both high limit protection and modulating
temperature control. The control’s high limit
function requires manual reset
. 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.)
Multi-temperature systems — 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 page59 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 cuto is required. See NOTICE above
regarding the inherent protection provided by the Control
module. A low water cut-o 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 o
at this location, see Figure51.
3. Use a low water cuto designed for water installations.
Electrode probe-type is recommended.
See Replacement parts for the Weil-McLain low water
cut-o 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 page59.
BoilerModels Systemheader
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 ow and head
loss for each zone.
Use back ow preventer in the cold water supply piping if required
by local codes.
(Baseboard,convectorsorcastironradiatorsONLY)
For residential space heating applications (other than radiant
heating or unit heaters) ONLY, you can use the sizing suggestions
in Figure52.
Figure51 LWCO 3/4" female NPT port location
Figure52 Suggested pipe sizing for system headers
and zone piping — RESIDENTIAL with
baseboard, convectors or cast iron radiators
ONLY (20°F temperature rise)
To Next Page
Loading...
Need help?
General
