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gas
Field wiring
K. Proof of closure (flow switch and/or CAD) –
Jumper on Terminal Strip P7 (EVG control, bottom left of center)
1. A flow switch or combustion air damper (CAD) interlock can be configured
by clipping the jumper on terminal strip P7 and wiring components as shown
at right and in the wiring diagram (Figure 65, page 59).
2. No control settings are required when using a flow switch.
3. Recommended configuration of the EVG control for a CAD interlock:
INPUT 3
a. Assign
as a
AUX PUMP/OUTPUT
b. For the
DEMAND
. This ensures the damper will be activated any time the boiler
is called on to fire.
OUTPUT 3
c.
will provide 120VAC to the damper motor. Use an isolation
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, left side)
1. See illustration at right and Figure 65, page 59 (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 configuring 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 set-
tings 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 modifier (TARGET ADJUST setting). The EVG control
does not control target.
Part number 550-100-131/0120
-
fired water boiler
(see wiring diagram, Figure 65, page 59)(continued)
AUX PUMP/OUTPUT
function.
operating mode, select
— 220/299/300/399 Boiler Manual
see ADVANCED Manual
ANY BURNER
OPTIONAL
–
OPTIONAL
See Figure 65, page 59 for details.
See Figure 65, page 59 for details.
– 57 –
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