Watts Aerco INN 600N Guide

Disclaimer
The information contained in this manual is subject to change without notice
from AERCO International, Inc. AERCO makes no warranty of any kind with
respect to this material, including, but not limited to, implied warranties of
merchantability and fitness for a particular application. AERCO International is
not liable for errors appearing in this manual, not for incidental or
consequential damages occurring in connection with the furnishing,
performance, or use of these materials.
Heating and Hot Water Solutions
AERCO International, Inc. • 100 Oritani Drive • Blauvelt, NY 10913
USA: T: [phone] • Toll Free: [phone] • AERCO.com
Technical Support • [phone] • Mon-Fri, 8 am - 5 pm EST
© 2019 AERCO
Electrical Power Design Guide
TAG-0092 •GF-5066 • 9/6/2019
Applies to models:
•INN 600N
•INN 800N
•INN 1060N
•INN 1350N
Innovation Water Heaters
With Edge [i] Controller

Innovation Water Heaters –Edge [i] Controller
Electrical Power Design Guide
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1General Information
Innovation-Edge (INN) Water Heaters are fully factory wired and packaged units which require simple
power wiring as part of the installation. This technical guide is intended to help designers provide
electrical power wiring (line voltage) to Innovation-Edge units. Control wiring details are provided in
other publications depending on the intended application. This document is intended as a guide only,
and cannot include all alternatives, situations, or be totally inclusive. To comply with all codes and
authorities having jurisdiction, designers and installers must plan the electrical wiring carefully and
execute the installation completely. Emergency shutoffs, fusible fire switches, break glass stations,
and other electrical requirements should be considered and installed whenever necessary.
2Electrical Requirements
Innovation-Edge water heaters require one of the following input power:
•120 volts, single phase, 50/60 Hz, 20 Amps
•220 volts, single phase, 50/60 Hz, 10 Amps
Refer to Figure 1 for typical Service Disconnect Switch location.
Figure 1. Service Switch Typical Location
The distribution block for field connection is located in the upper right of the control box (see Figure 2).
All copper wire must be connected to the terminal distribution block. 110 VAC is the minimum
allowable supply voltages to the unit. Lower voltages will result in increased wear and premature
failure of the blower motor. Wire size and type should be made per the National Electrical Code based
on length and load.
Figure 2 shows the location of the Power Box containing the terminal block connections. The Power
Box is accessed by removing the front panel door of the unit.
Service
Disconnect
Switch
Knock-Out for
alternate electrical
conduit to Service
Switch
INNOVATION-EDGE

Innovation Water Heaters –Edge [i] Controller
Electrical Power Design Guide
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Power Box Shown With Cover Removed
Figure 2. Terminal Block Location
2.1 220V Input Power
Innovation-Edge units operate internally on 120 VAC power. All Innovation-Edge units that will
connect to a 220 VAC power source must be ordered with a 220 VAC to 120 VAC transformer. This
transformer is installed inside the unit, as shown in Figure 3. The 220 VAC electrical connection is
made in the Power Box to the same terminals as 120 VAC connections are made (see Figure 2). The
transformer is pre-wired to convert the power to 120 VAC. No further steps are needed.
Figure 3. 220V Transformer –Front Frame & Panel and Side Panels Removed
3Provisions for Service
Designers must provide emergency shutoffs and other devices to satisfy electrical codes. It is also
recommended to provide an electrical shutoff disconnect switch of suitable load carrying
characteristics on or near each water heater. No electrical boxes or field components should be
mounted to the surface of the unit or where they would interfere with the removal of the side or top
POWER BOX
TERMINAL BLOCK
FOR 110 VAC
UNITS
220 VAC to 120 VAC
TRANSFORMER
NOTE
Terminal block will specify 220
VAC for international units

Innovation Water Heaters –Edge [i] Controller
Electrical Power Design Guide
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panels for maintenance. The disconnect switch should be mounted near the unit as illustrated in
Figure 1. Wiring conduit, EMT, or other wiring paths should not be secured to the unit, but supported
externally. Electricians should be instructed as to where the wiring conduit should be located, such as
away from the relief valve discharge, drains, etc. All electrical conduit and hardware should be
installed so that it does not interfere with the removal of any cover, inhibit service or maintenance, or
prevent access between the unit and walls or another unit.
4Unit Wiring
A dedicated protected circuit should be provided from the power source to the unit. No other electrical
devices should be permanently wired on the same circuit. An emergency switch (electrical shutoff)
must be in series with the power to the unit. Refer to Figure 4 (120 VAC units) and Figure 5 (220 VAC
units) for the wiring connections to the terminal block contained in the unit’s Power Box.
Figure 4. 120 volt, Single Phase Wiring Schematic
TERMINAL BLOCK IN
POWER BOX
DISCONNECT SWITCH
SINGLE-POLE, 20 AMP
120 V 1 phase
1 POLE 20 AMP
CIRCUIT BREAKER
GND
L2/N
L1
120 VAC 1 PHASE
GND L2/N L1

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Electrical Power Design Guide
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Figure 5. 220, Single Phase Wiring Schematic
5Multiple Unit Wiring
Whenever multiple units are installed within the same mechanical spaces, electrical code
requirements call for a single electrical shutoff for emergency use. It is the responsibility of the
electrical designer to comply with local codes and regulations affecting an individual installation.
TERMINAL BLOCK IN
POWER BOX
DISCONNECT SWITCH
SINGLE-POLE, 10 AMP
220 V 1 phase
1 POLE 10 AMP
CIRCUIT BREAKER
GND
L2/N
L1
220 VAC 1 PHASE
GND L2/N L1

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Electrical Power Design Guide
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© AERCO International, Inc., 2019
Change Log:
Date
Description
Changed by
9/6/2019
Rev A: Initial release