Weil-McLain EcoTec 80 Manual page 74

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®
ECO Tec
AS FIRED WATER BOILER
ECO Tec control operation
ECO Tec control operation
The control responds to signals from:
DHW Flow demand.
Room thermostats.
DHW aquastats (if used).
Temperature sensors Boiler Out, Boiler In, flue temperature and
when used, outdoor temperature.
The control automatically adjusts blower speed (and gas flow rate) to
match boiler output to space heating and/or DHW heating demand.
The control provides four inputs and four outputs (for circulators
or auxiliary devices) plus a fifth boiler circulator output.
Outdoor reset must be used in all applications that are not exempt
as described on page 149.
The outdoor temperature is used for supply temperature reset
operation and for the Warm Weather Shut Down (WWSD) option.
System presets:
The ECO Tec control provides presets by system type for
complete list, see Figure 79, page 85.
DHW Target
Set DHW target to the required Combi DHW water temperature for the
application according to design mixing valve.
1. OUTDOOR TEMP FOR MIN TARGET means the outdoor
temperature at which the target temperature reaches its minimum
(Min Target Temp).
2. In the examples of Figure 73, this occurs at 70 °F (the factory default).
1. OUTDOOR TEMP FOR MAX TARGET means the outdoor
temperature at which the target temperature reaches its maximum
value (Max Target Temp).
2. In the examples of Figure 73, this occurs at 0°F outdoor (the factory
default setting).
3. OutDOOR TEMP FOR MAX TARGET should equal the Outdoor
Temp (outdoor design temperature) for the installation's location.
Outdoor reset operation
4. Set desired temperatures for space heating zones.
5. For an explanation of the target temperatures and associated outdoor
temperatures, see Figure 73.
6. The temperature settings discussed below are accessed in the priority
menu for the applicable system. For detailed explanations of the
priority menus, see Figure 82, page 89.
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Set Max Target Temp to the required supply water temperature for the
system at design maximum heat loss (typically 180°F for finned tube
baseboard on new installations).
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1. Min Target Temp should equal the desired minimum supply water
temperature for the system.
2. This could be set as low as 60°F, which would supply "zero heat"
when outdoor temperature is 70°F, because supply water temperature
would equal room temperature. See examples in Figure 73.
Remote target operation (0–10VDC input)
1. This function allows a remote analog input to regulate the supply
temperature for control operation/modulation. This can be done
for any priority.
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(continued)
Remote target operation
2. The settings discussed below are accessed in the priority
menu for the applicable system. For detailed explanations
of the priority menus, see Figure 82, page 89.
3. See Figure 74 for an explanation of target temperature vs
voltage when using remote target operation.
4. In the priority menu for the applicable system, select
0-10V for the TARGET ADJUST setting.
5. In the same priority menu, select the VOLTS FOR MIN
TARGET and VOLTS FOR MAX TARGET values. VOLTS
FOR MIN TARGET sets the voltage value for the desired
minimum supply temperature. VOLTS FOR MAX
TARGET sets the voltage value for the desired maximum
supply temperature.
Remote modulation operation
(0–10VDC input)
1. To use 0-10VDC for remote modulation, go to Contractor
Menu -> System Settings -> select the appropriate
priority. Select Input 1 from System Setting menu, then
change Input 1's source to 0-10V. The priority that is
assigned to Input 1 cannot be used by any other Input.
2. The boiler comes on at 0.9VDC and turns off at 0.6VDC.
1 VDC = 10% input. 10VDC = 100% input. These voltage
settings are adjustable.
B M
OILER ANUAL
Outdoor reset operation
Part number 550-100-260/0520