Weil-McLain Evergreen EVG 70 Manual page 60

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g
Field wiring
K. Proof of closure (fl ow switch and/or CAD) –
Jumper on Terminal Strip P7 (EVG control module)
1. A fl ow switch or combustion air damper (CAD) interlock can be confi gured
by clipping the jumper on terminal strip P7 and wiring components as shown
at right and in the wiring diagram ( Figure 60, page 62 ).
2. No control settings are required when using a fl ow switch.
3. Recommended confi guration of the EVG control for a CAD interlock:
a. Assign as a
INPUT 3
b. For the
AUX PUMP/OUTPUT
. This ensures the damper will be activated any time the boiler
DEMAND
is called on to fi re.
c. will provide 120VAC to the damper motor. Use an isolation
OUTPUT 3
relay if damper motor requires another voltage or more than 2.2 amp if
using 120 VAC.
*
The devices used must provide electrically isolated contacts,
because the P7 jumper circuit carries 5 VDC.
L. 0–10 VDC Remote TARGET input –
Terminal Block P15 #5 & #6 (EVG control module)
1. See illustration at right and Figure 60, page 62 (wiring diagram) for details.
2. Remote target using 0–10VDC input requires a 0–10VDC input signal at
P15-4/5 as shown at right.
a. The input positive connection must be at P15 terminal 6 and the common
connection at terminal 5.
3. This illustration also shows how to connect TT or end switch contacts at
INPUT 1, INPUT 2 and INPUT 3.
a. If a Heat/DHW demand is required, connect the demand's dry contact
to an unused input on the control and its pump/valve to the respective
output. Then assign and setup a priority to the input using the Wizard
or manually through the contractor menu.
b. A dry contact heat demand must be applied to one of the inputs in order
to initiate a call for heat.
4. The 0–10VDC signal is used to adjust the supply target temperature, using
the TARGET ADJUST setting. Set TARGET ADJUST during the WIZARD or
manually in the PRIORITY SETTINGS menu for the desired system/ priority.
a. Many options are available for confi guring the control. The following is
a suggested setup that uses factory default settings as much as possible.
b. Use PRIORITY 1 for the DHW heating system when used. This priority's
default values are set for DHW, direct-piped to the boiler. Verify that
settings are suitable for the application, change if needed.
c. Use PRIORITY 2 for the heating systems.
• For single boilers, the factory default settings for PRIORITY 2
make this priority a good choice for space heating applications.
Set PRIORITY 2 values to the following:
• Set TARGET ADJUST value to 0–10V.
• Set VOLTS FOR MAX at the voltage that will call for the highest target
temperature. Set SUPPLY MAX at this temperature.
• Set VOLTS FOR MIN at the voltage that will call for the lowest target
temperature. Set SUPPLY MIN at this temperature.
• For voltages between VOLTS FOR MAX and VOLTS FOR MIN, the
target temperature will range proportionately between SUPPLY MAX
and SUPPLY MIN. See the EVG Advanced Manual for a full discussion.
• NOTE: The 0–10VDC signal replaces the ODT sensor as the target
temperature modifi er (TARGET ADJUST setting). The EVG control
does not control target.
60
as-fired water boiler —
(see wiring diagram, Figure 60, page 62 ) (continued)
function.
AUX PUMP/OUTPUT
operating mode, select
70/110/155
see ADVANCED Manual
ANY BURNER
See Figure 60, page 62 for details.
OPTIONAL
See Figure 60, page 62 for details.
Boiler Manual
–
OPTIONAL
Part number 550-100-191/0917