Weil-McLain Eco Tec 2 Series Advanced Manual page 36

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ECO Tec series 2 gas-fired water boiler – advanced manual
Field wiring
(see wiring diagram, Figure 18, page 44) (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.
C. Inputs 1, 2, 3 and 4 (demands) –
Connector J17 (Input 1, 2, & 3) & Connector J16 (Input 4, 0-10VDC Input)
1. Input 1 – Connector J17 – 1, 2 & 3 (common)
2. Input 2 – Connector J17 – 4, 5 & 6 (common)
3. Input 3 – Connector J17 – 7, 8 & 9 (common)
4. Input 4 – Connector J16 – 1, 2 & 3 (common)
5. These four (4) inputs on each boiler can indicate a call for heat to the con-
trol by means of a dry contact closure (thermostat, aquastat, or switch).
(See right and Figure 18, page 44).
6. The control provides inputs for up to four (4) demands and up to three (3)
systems (priorities).
7. For Priority Indirect DHW Application:
The DHW aquastat can be connected to any one of the four (4) input/output pairs
for Heating Only models and Inputs 2 or 3 for Combi models. The selected input
should be assigned to LOCAL PRIORITY 1 during the WIZARD setup or manu-
ally in the System Settings menu for Heating Only models or LOCAL PRIORITY
2 for Combi models.
8. The default control setting uses each input (INPUT 1, INPUT 2, INPUT 3 and
INPUT 4) to control its respective 120VAC output (OUTPUT 1, OUTPUT 2,
OUTPUT 3 and OUTPUT 4). For Combi models, input 1 and 4 and output
1 and 4 are reserved for Combi calls for heat and 3-way valve operation.
Use of 0–10VDC input for modulation disables Input 2 T/T input
from creating calls for heat. See page 40 for instructions.
An input can be assigned to an AUX PUMP/OUTPUT function to
operate a system pump or interlock with a combustion air damper.
Inputs assigned for this function cannot be used for heat demand
operation. See page 70 for more information on the setup and
selection of operating conditions.
Use Priority 2 - Network 1 for system piped DHW applications.
Thermostats
circuits (Input 1, Input 2, Input 3 and Input 4 in Figure 18, page 44)
or attempt to supply 24 volts for any other application.
For thermostats that require a continuous 24-volt power source,
connect the common wire ("C") (see Figure 18, page 44). Do NOT
exceed 120mA total amp draw at 24VAC per thermostat.
– 36 –
—
supply 24-volt power to the thermostat
DO NOT
As needed for systems
Zone valves
relays to provide dry contacts to the Control ther-
mostat connections. The zone valve end switches
of 3-wire valves carry 24VAC from the valve.
Thermostat anticipator setting
See Figure 18, page 44 for details.
— If using 3-wire zone valves, use
— 0.1 amps.
Part number 550-100-272/1021