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Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 2
– INSTALLATION
OMM-0143_A
• GF
-216
•
9/6/2019
Technical Support
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(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 31 of 170
2.
If “On Board” Water Heater Management is enabled, the Analog Output terminals are
used to drive the isolation valve, open and closed.
NOTE:
When driving an isolation valve, shorting jumper #JP2
MUST
be installed on the I/O Board.
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 Edge
Controller’s
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 Edge
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 4-20 mA 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 2.12-2). 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 IN
TL’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 t
he 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 (
Auxiliary Delay
) 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
Auxiliary Delay
parameter (in
Main Menu
→
Advanced Setup
→
Ancillary
Device
→
Interlocks
) can be programmed from 0 to 240 seconds.
2.12.13 FAULT RELAY Terminals
The fault relay is a single pole double throw (SPDT) relay having a normally open and normally
closed set of relay contacts that are rated for 5 amps at 120 VAC and 5 amps at 30 VDC. The