AERCO Innovation (G-13-1854 and above) - Manual (Page 31)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0078_0J
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 31 of
196
GF-128
Phone: 800-526-0288
PRI: 11/22/2013
2.12.3 O2 SENSOR Terminals
The O2 SENSOR (–) and O2 SENSOR (+) terminals are not currently used in this unit.
2.12.4 SPARK SIGNAL Terminals
The SPARK SIGNAL terminals (+ & -) permit an external current sensor to be connected for
ignition spark monitoring purposes. If no spark is present during the ignition sequence, the
controller will shut down and display a fault message.
2.12.5 ANALOG IN Terminals
The ANALOG IN terminals (+ & -) are used when an external signal is used to change the
setpoint (Remote Setpoint Mode) of the heater.
Either a 4 to 20 mA /1 to 5 VDC or a 0 to 20 mA/ 0 to 5 VDC signal may be used to vary the set-
point or air/fuel valve position. The factory default setting is for 4 to 20 mA / 1 to 5 VDC,
however this may be changed to 0 to 20 mA / 0 to 5 VDC using the Configuration Menu
described in Chapter 3.
If voltage rather than current is selected as the drive signal, a DIP switch must be set on the
PMC Board located inside the C-More Control Box. Refer to Appendix D in C-More Manual GF-
112 for information on setting DIP switches.
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 Heater’s I/O Box.
Whether using voltage or current for the drive signal, they are linearly mapped to a 40°F to
240°F setpoint or a 0% to 100% air/fuel valve position. No scaling for these signals is provided
2.12.6 B.M.S. (PWM) IN Terminals
The B.M.S. (PWM) IN Terminals are not applicable to Water Heaters.
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 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 C-More controller is Valve Position 0-10v and settings behave as follows:
1) When 0-10VDC is selected, the voltage output is used by the controller to modulate the
combustion blower via the I/O Box terminals labeled VFD/Blower (Section 2.12.11).
2) If “On Board” boiler or Water Heater Management is enabled, the Analog Output
terminals are used to drive the isolation valve, open and closed.
3) When the 4-20mA is selected for the Analog Output, the 0-10VDC is disabled at the
VFD/Blower terminals, and the selected output is available at the terminals labeled
Analog Output +/-.