User Manual

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0103_0A AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 33 of 178
GF-147 Phone: [phone] PRI: 10/28/2014
Figure 2-14: I/O Box Terminal Strips
2.12.1 OUTDOOR AIR IN Terminal
The OUTDOOR AIR IN and AIR SENSOR COMMON terminals are not applicable to this unit.
2.12.2 AIR TEMPERATURE SENSOR Terminals
The COMBUSTION AIR and AIR SENSOR COMMON terminals are not applicable to this unit.
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 abort the ignition cycle. The controller will attempt up to three ignition cycles. If no
spark is present by the third try, 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.