Weil-McLain Eco Tec 2 Series Advanced Manual page 5

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ECO Tec series 2 gas-fired water boiler – advanced manual
ECO Tec Control
y Each boiler has up to four (4) input/output pairs (INPUT/
OUTPUT 1, 2, 3 and 4) for Heating Only boilers, 2 and 3
for Combi models.
y Control setup prompts the user to assign each of these I/O
pairs to a PRIORITY. The control then knows which system
(priority) to operate when the input receives a call for heat. On
a call for heat to an input, the control closes the corresponding
output (120VAC) and begins controlling the boilers according
to the setup for the assigned priority.
y When multiple inputs are set up on the same priority, they
will run at the same time if the priority and inputs are active.
Boiler circulator
y The boiler circulator is factory installed inside the boiler
cabinet.
y For multiple boiler systems, the boiler pump is defaulted to
run and cannot be changed.
The boiler circulator must be installed and
connected. Flow through the boiler must be
provided during all times of operation. Fail-
ure to do so can result in severe personal
injury, death or substantial property damage.
ECO Tec control operation
• The control responds to signals from:
• DHW Flow demand (Combi models only).
• DHW Temperature sensor (Combi models only).
• Room thermostats.
• DHW aquastats (if used).
• Temperature sensors Boiler Out, Boiler In, flue tempera-
ture and when used, outdoor temperature.
• For optimal performance, it is recommended to
install System Supply and Return sensors.
y The control automatically adjusts blower speed to match boiler
output to space heating and/or DHW heating demand.
y The control provides up to four (4) inputs and four outputs
(for circulators or auxiliary devices) plus a fifth (5) boiler
circulator output based on selected boiler model.
y Outdoor reset must be used in all applications that are not
exempt as described on page 2.
y The outdoor temperature is used for target temperature reset
operation and for the Warm Weather Shut Down (WWSD)
option.
y System presets:
The control provides presets by system type for complete
list, see Figure 25, page 55.
DHW Target
Set DHW target to the required Combi DHW water temperature
for the application according to design mixing valve.
OUTDOOR TEMP FOR MIN TARGET
1. OUTDOOR TEMP FOR MIN TARGET means the outdoor
temperature at which the target temperature reaches its minimum
(Min Target Temp).
Part number 550-100-272/1021
Overview
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2. In the examples of Figure 2, this occurs at 70 °F (the factory default).
OUTDOOR TEMP FOR MAX TARGET
1. OUTDOOR TEMP FOR MAX TARGET means the outdoor tem -
perature at which the target temperature reaches its maximum value
(Max Target Temp).
2. In the examples of Figure 2, this occurs at 0°F outdoor (the factory
default setting).
3. OutDOOR TEMP FOR MAX TARGET should equal the Out -
door Temp (outdoor design temperature) for the installation's
location.
Outdoor reset operation
1. Set desired temperatures for space heating zones.
2. For an explanation of the target temperatures and associated
outdoor temperatures, see Figure 2.
3. The temperature settings discussed below are accessed in the
priority menu for the applicable system. For detailed explana-
tions of the priority menus, see Figure 35, page 65.
Figure 2
Figure 3
(continued)
Outdoor reset operation
Remote target operation
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