Weil-McLain EcoTec 80 Manual page 65

G -
®
ECO Tec
AS FIRED WATER BOILER
Field wiring
(see wiring diagram, Figure 70, page 66) (continued)
Combi models use Input/Output pairs 1 and 4 for 3-way valve operation and cannot be used for any
other purpose. Use Input 2 for Indirect DHW (if needed) and Input 3 for Space Heating applications.
L. 0–10 VDC Remote MODULATION input –
1. See illustration at right and Figure 70, page 66 for details.
2. This illustration also shows how to connect TT or end switch contacts at
INPUT 3 and INPUT 4 for other uses.
3. Note that using 0–10VDC input replaces INPUT 2 for generating a heat
demand. Do NOT wire any input to INPUT 2 as shown at right.
4. Remote modulation requires a 0–10VDC input signal at J16-5/6 as shown
at right.
a. The 0–10VDC input positive connection must be at terminal 6 and
common connection at terminal 5.
5. Control setup:
a. Many options are available for configuring the control. The following is
a suggested setup that uses factory default settings as much as possible.
b. If Indirect DHW is required, use PRIORITY 1 to minimize setup steps.
Connect the DHW aquastat to INPUT 3, or INPUT 4 and assign the
input used to PRIORITY 2.
Verify that control settings are suitable for the application, change
if necessary.
c. Use PRIORITY 3 for the system to be remote modulated.
The factory default settings for this priority are best suited for space
heating.
Assign INPUT 2 to the priority chosen. Accept all defaults for INPUT 2
— no changes should be necessary during the WIZARD.
After the WIZARD has been completed, go to the SYSTEM SETTINGS
– INPUT USAGE menu for INPUT 2. Change SOURCE to 0–10V
(default setting is TT1). See page 92 for System Settings menu
information.
6. Operation:
a. The boiler comes on at 0.9VDC and turns off at 0.8VDC. 1 VDC = 10%
input. 10 VDC = 100% input. These voltage settings are not adjustable.
b. OUTPUT 2 (120VAC) is activated and deactivated as the heat demand
is turned on and off. This output is a good choice to operate the system
pump.
NOTE: The control can be configured to use either 0–10VDC for target operation
(see previous section) or modulation,
Part number 550-100-260/0520
–
80/110/150/199
OPTIONAL
.
B M
OILER ANUAL
See Figure 70, page 66 for details.
65