The factory default setting is 4 to 20 mA, however this can be changed in the Remote Signal
parameter in Main Menu → Advanced Setup → Unit → Application Configuration (note,
Operating Mode must equal Remote Setpoint).
If voltage rather than current is selected as the drive signal, a DIP switch must be set on the
Interface Board, located inside the Edge Controller. Refer to Appendix G – Edge [i] Controller
Views for information on setting DIP switches. If Remote Signal is set to either 4 to 20 mA or 0
to 20 mA, DIP switch #4 in block SW1 must be set to mA. If Remote Signal is set to 1 to 5
VDC or 0 to 5 VDC, DIP switch #4 must be set to V.
All supplied signals must be floating (ungrounded) signals. Connections between the source
and the Heater’s I/O Box must be made using twisted shielded pair of 18–22 AWG wire such as
Belden 9841. Polarity must be maintained and the shield must be connected only at the source
end and must be left floating (not connected) at the unit’s I/O Box.
Whether using voltage or current for the drive signal, they are linearly mapped to a 40°F (4.44
°C) to 240°F (115.6 °C) setpoint or a 0% to 100% air/fuel valve position. No scaling for these
signals is provided.
2.12.6 VALVE FEEDBACK Terminals
The Valve Feedback terminals are used when the Sequencing Isolation Valve Feedback option
is selected. The Valve Feedback signal is connected to the “Valve Fdbk” terminals and is used
to confirm that the valve has properly opened or closed. If the Valve Feedback signal does not
match the Valve-Open or Valve-Close command for the time defined in the "Valve Fdbk timer"
entry, the controller will proceed as follows:
(a) If the valve fails with the Valve Stuck Open fault, the Valve Stuck Open message will be
displayed and the unit will remain active.
(b) If the valve fails with the Valve Stuck Closed fault, the Valve Stuck Closed message will
be displayed and the unit will shut down.
NOTE:
If the Valve Feedback option is used, Shorting Jumper #JP2 on the I/O Board will be inserted
at the factory.
2.12.7 SHIELD Terminals
The two SHIELD terminals are used to terminate any shields used on sensor wires connected to
the unit. Only shields must be connected to these terminals.
2.12.8 ANALOG OUT Terminals
The two ANALOG OUT terminals (+ & -) output from 0 to 20 mA and may be used to monitor
Setpoint, Outlet Temperature, Valve Position 4-20 mA, Valve Position 0-10v or be set to OFF.
Default setting in the Edge Controller is Valve Position 0-10 v and settings behave as follows:
1. 0-10VDC must be selected for the voltage output used by the controller to modulate the
combustion blower via the I/O Box terminals labeled VFD/BLOWER (Section 2.12.11).
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