AERCO Innovation (G-14-2265 and above) - Manual (Page 32)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 32 of
206 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0078_0L
PRI: 11/25/2014
Phone: 800-526-0288
GF-128
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 +/-.
2.12.9 RS485 Comm Terminals
The RS485 communication terminals (+, GND, & -) are used when the Innovation Water
Heaters are being controlled by an Energy Management System (EMS) or the C-More Water
Heater Management (WHM) system using Modbus (RS485) communication. The WHM
software required to control up to 8 AERCO Innovation Water Heaters is included in the C-More
Control System used with each Innovation unit.
2.12.10 RS232 Comm Terminals
As of Firmware version 4.0 and above, these terminals are used only by factory-trained
personnel to monitor OnAER communications via a portable computer.
2.12.11 VFD/BLOWER Terminals
These terminals (0-10 & AGND) send an analog signal to control the blower speed. When any
of the 4-20mA options is selected for the Analog Outputs (Section 2.12.8), the output from the
VFD/Blower terminals is disabled.
2.12.12 Interlock Terminals
The unit offers two interlock circuits for interfacing with Energy Management Systems and
auxiliary equipment such as pumps or louvers or other accessories. These interlocks are called
the Remote Interlock and Delayed Interlock (REMOTE INTL’K IN and DELAYED INTL’K IN in
Figure 2-12). Both interlocks, described below, are factory wired in the closed position.
NOTE
Both the Remote Interlock and Delayed Interlock must be in the closed
position for the unit to fire.
2.12.12.1 REMOTE INTL’K Terminals
The remote interlock circuit is provided to remotely start (enable) and stop (disable) the unit if
desired. The circuit is 24 VAC and comes factory pre-wired closed (jumped).
2.12.12.2 DELAYED INTL’K Terminals
The delayed interlock is typically used in conjunction with the Auxiliary Relay Contacts
described in section 2.12.14. This interlock circuit is located in the purge section of the start
string. It can be connected to the proving device (end switch, flow switch etc.) of an auxiliary
piece of equipment started by the unit’s auxiliary relay. The delayed interlock must be closed for
the heater to fire. If the delayed interlock is connected to a proving device that requires time to
close (make), a time delay (Aux Start On Dly) that holds the start sequence of the unit long
enough for a proving switch to make (close) can be programmed.
Should the proving switch not prove within the programmed time frame, the unit will shut down.
The Aux Start On Dly can be programmed from 0 to 120 seconds. This option is located in the
Configuration Menu (Chapter 3).