Install Instructions
Part number 550-100-260/0520
65
ECO
®
Tec GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
L. 0–10 VDC Remote MODULATION input – OPTIONAL
#ONNECTOR*
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.
s Connect the DHW aquastat to INPUT 3, or INPUT 4 and assign the
input used to PRIORITY 2.
s Verify that control settings are suitable for the application, change
if necessary.
c. Use PRIORITY 3 for the system to be remote modulated.
s The factory default settings for this priority are best suited for space
heating.
s Assign INPUT 2 to the priority chosen. Accept all defaults for INPUT 2
— no changes should be necessary during the WIZARD.
s 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,
BUTNOTBOTH.
See
Figure 70, page 66
for details.
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.