State UPVS-18K, UPVS-24K, UPVS-30K, UPVS-35K, UPVS-35E, UPVS-45E, UPVS-55E, UPVS-70E, UPVS-90E, UPVS-119E, UPVS-40Y, UPVS-55Y, UPVS-80Y, UPVS-110Y, Instruction Manual

Installa on Instruc ons
and Use & Care Guide
Electric Tankless
Water Heater
PLEASE DO NOT RETURN THIS UNIT TO THE
STORE.
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have difficulty following the direc ons, or
aren’t sure you can safely and properly do any of this work yourself:
°F
°C
•
Call our Technical Assistance Hotline which is listed on your warranty. We can
help you with installa on, opera ons, troubleshoo ng, or maintenance. Before
you call, write down the model and serial number from the water heater’s ra ng
plate.
•
Incorrect installa on, opera on, or service can damage the water heater, your
house and other property, and present risks including fire, scalding, electric
shock, and explosion, causing serious injury or death.
ENTER
Table of Contents ..............................Page
IMPORTANT SAFETY INFORMATION ............................. 2
GENERAL INFORMATION ............................................... 5
INSTALLATION ................................................................. 8
OPERATION ................................................................... 11
TROUBLESHOOTING ..................................................... 13
MAINTENANCE ............................................................. 16
SERVICE/REPAIR............................................................ 18
WIRING DIAGRAMS ..................................................... 28
APPENDIX ...................................................................... 30
C
US
Keep this manual near the water heater for future reference whenever maintenance, adjustment or service is required.
Retain your original receipt as proof of purchase.
June, 2024
100378931_2000810930_REV. C
SAFETY
IMPORTANT SAFETY INFORMATION
Read and follow all safety messages and instruc ons in
this manual.
This is the safety alert symbol. It is used to alert you to
poten al physical injury hazards. Obey all safety messages
that follow this symbol to avoid possible property damage,
serious injury or death. Do not remove any permanent
instruc ons, labels, or the data plate from either the outside of the water
heater or on the inside of the access panels. Keep this manual near the
water heater.
Important informa on to keep...
Fill out this sec on and keep this
manual for reference.
Date Purchased:
Model number:
Serial number:
DANGER
DANGER indicates hazardous
situa on that, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous
situa on that, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a hazardous
situa on that, if not avoided, could
result in minor or moderate injury.
NOTICE
2
•
NOTICE indicates prac ces not
related to physical injury.
Electric Tankless Water Heater
Maintenance performed:
Date:
o reduce the risk of property damage, serious injury or death, read
and follow the precau ons below, all labels on the water heater, and the safety
messages and instruc ons throughout
this manual.
General Requirements
•
•
Install and properly ground the
unit in accordance with local
codes, or in the absence of local
codes, with the current edition
of the National Electrical Code:
ANSI/NFPA 70 in the USA.
Follow all applicable plumbing,
heating, and air conditioning
codes during installation.
RISKS DURING INSTALLATION
AND MAINTENANCE
• Use a non-contact circuit tester to
confirm that power is off before
working on or near any electrical
parts.
Temperature Time to Produce a
Serious Burn
120°F (49°C)
More than 5 minutes
• Be sure the cover is reinstalled and
secured after servicing to reduce
the risk of fire and electric shock.
125°F (52°C)
1½ to 2 minutes
130°F (54°C)
About 30 seconds
135°F (57°C)
About 10 seconds
RISKS DURING OPERATION
140°F (60°C)
Less than 5 seconds
145°F (63°C)
Less than 3 seconds
150°F (66°C)
About 1½ seconds
WARNING
Scalding Risk
This water heater
can make water hot
enough to cause
severe burns instantly, resulting in
severe injury or death.
•
Feel water before bathing or
showering.
•
To reduce the risk of scalding,
install Thermostatic Mixing
Valves (temperature limiting
valves) at each point of use.
These valves automatically mix
hot and cold water to limit the
temperature at the tap. Mixing
valves are available at your local
hardware store or from your
plumbing supplier. Follow the
manufacturer’s instructions for
installation and adjustment of the
valves.
WARNING
Electric Shock Risk
Contact with the electrical
parts inside the water heater
can result in severe injury or
death from electrical shock:
• Disconnect power by opening the
circuit breaker(s) before installing
or servicing.
• SOME MODELS ARE CONNECTED
TO MORE THAN ONE BRANCH
CIRCUIT, AND MORE THAN ONE
DISCONNECT SWITCH MAY BE
REQUIRED TO DE ENERGIZE THE
EQUIPMENT. ALL BRANCH CIR
CUITS MUST BE DISCONNECTED
PRIOR TO SERVICE.
•
For most models, the temperature
set point is factory set to 120°F to
reduce the risk of scalding.
•
Higher temperatures increase
the risk of scalding, but even at
120°F, hot water can scald. If you
choose a higher temperature,
Thermostatic Mixing Valves
located at each point of use are
particularly important to help
avoid scalding.
SAFETY
T
For information about changing the
factory temperature setting, refer to
“Water Temperature Adjustment” on
page 11.
Even if you set the water heater set
point to a low se ng, higher temperatures may occur in certain circumstances:
• Water temperature will be hotter if
someone adjusted the temperature
set point to a higher setting.
• If the water supplied to the water
heater is pre-heated (for example,
by another water heater), the temperature of the water may be higher than the temperature set point.
• Problems with the UIM or other
malfunctions may result in higher
than expected water temperatures.
Electric Tankless Water Heater
•
3
SAFETY
To reduce the risk of unusually hot water reaching the fixtures in the house,
install Thermosta c Mixing Valves at
each point of use.
If anyone in your home is at par cular
risk of scalding (for example, the elderly, children, or people with disabilies) or if there is a local code or state
law requiring a certain water temperature at the hot water tap, then these
precau ons are par cularly important.
According to a na onal standard, American Society of Sanitary Engineering
(ASSE 1070), and most local plumbing
codes, the water heater’s temperature
set point should not be used as the sole
means to regulate water temperature
and avoid scalds.
Properly adjusted Thermosta c Mixing
Valves installed at each point of use
allow you to set the water heater’s
set point to a higher se ng without
increasing the risk of scalds. A higher
temperature can help provide proper
water temperatures for appliances such
as dishwashers and washing machines.
WARNING
• Keep the water heater from becoming wet. Immediately shut the water
heater off and have it inspected by
a qualified person if you find that
the wiring or control board have
been exposed to water in any way
(e.g., leaks from plumbing or leaks
from the water heater itself). Such
leaks can damage property and
could cause a fire risk. If the water
heater is subjected to flood conditions or has been submerged in
water, the entire water heater must
be replaced.
• Make electrical connections properly according to the instructions
on page 10. Use a UL listed or
CSA approved strain relief. Connect the ground wire to the ground
terminal port of the terminal block.
The ground lug is identified by an
embossed grounding emblem inside
the water heater.
Water Contamination Risk
Do not use chemicals that could contaminate the potable water supply. Do
not use piping that has been treated
with chromates, boiler seal, or other
chemicals.
Fire Risk
To reduce the risk of a
fire that could destroy
your home and seriously injure or kill people:
• Do not store things that can burn
easily such as paper or clothes next
to the water heater.
• Be sure the water heater’s cover
is in place. This cover keeps debris
from entering and potentially being
ignited, and helps keep any internal
fires from spreading.
4
•
Electric Tankless Water Heater
GENERAL INFORMATION
Introduction
This manual provides information
necessary for the installation,
operation, and maintenance of
the water heater.
•
The model description is listed on
the rating plate which is attached
to the side panel of the water
heater.
•
Please read all installation
instructions completely before
installing this product.
•
If you have any problems
or questions regarding this
equipment, consult the
manufacturer or its local
representative.
This appliance is an on-demand,
electric tankless water heater. It is
designed to efficiently supply endless
hot water for your needs, when
appropriately sized for the application.
A built-in alarm is included. If water
leaks onto the leak detection sensor,
an alarm will sound to provide
warning. Turn off power to the water
heater at the circuit breakers, turn
off the water supply, then correct the
leak.
drainage of both the T&P Relief Valve
and the discharge pipe. The discharge
pipe must not be smaller than the
pipe size of the T&P Relief Valve. The
pipe must also be able to withstand
250°F (121°C) without distortion. Use
only copper or CPVC pipe. Do not use
any other type of pipe, such as PVC,
iron, flexible plastic pipe, or any type
of hose.
NOTICE: If a temperature and
pressure relief valve is installed, the
discharge pipe should be at least ¾”
inside diameter and sloped for proper
drainage. Install to allow complete
WARNING! Do not cap or plug the
T&P relief valve or discharge pipe.
Figure 1 - Component Identification:
Point-of-Use Models
TOP VIEW
TH3
TH1
TH2
TH4
NOTICE: The user interface is
described in Figure 11, page
15.
Outlet Thermistor *
OUTLET
Chamber Thermistor *
TH2
TH3
TH4
Sensor
Connection
TH1 TH2 TH3 TH4
Flow
Sensor
TH-Out
Your water heater also includes onboard self diagnostics. If the system
produces an error code, see the
Troubleshooting section found on
pages 13-15.
F
TEMPERATURE
MODE JUMPER
Not Used
C
Component Descriptions
Lavatory
(140 F)
Eye Wash
(85 F)
ENTER
Temperature and Pressure
Relief Valve
In most cases, you are not required
to install a temperature and pressure
relief valve (T&P valve). However,
some local codes do require the
installation of a T&P Valve. If a T&P
valve must be installed, install it on
the hot outlet pipe according to the
valve manufacturer’s instructions and
local code.
TH1
INLET
Control Board
Side Entry
Power Supply
Back Entry
Power Supply
Knockout Point
TERMINAL
BLOCK
Chamber cut
away to expose
the element and
chamber thermistor
L1
L2/N
Heating Elements
* Often referred to as a temperature sensor.
Leak Detection
Sensor
Electric Tankless Water Heater
GND
•
5
GENERAL INFO
•
If you install a T&P valve, turn on
the water supply to ensure that no
water drips from it. Next, operate the
valve manually two or three times to
purge the trapped air from the top of
the heater’s chamber, then close the
valve. Verify that water has stopped
flowing completely before connecting
the discharge pipe to the valve.
GENERAL INFO
General Specifications
Point-of-Use:
UPV
Models
Wiring & Circuit Breaker
Requirements
Water Connections
Weight
lbs. (kg)
Water Heater
Dimensions*
*
See “Electrical Requirements” on page 7.
1/2” NPT
2 Chamber
4 Chamber
6 lbs. (2.7 kg) full
8 lbs. (3.6 kg) full
H 12.22” x W 7.65” x D 5.11”
(H 31.04cm x W 19.43cm x D 12.98 cm)
Height dimension includes the distance from the bottom of the heater to the highest point of the inlet/outlet.
Width dimension includes the mounting tabs on the left-hand and right-hand sides (two- and four-element models).
NOTE:
• Check the rating plate to ensure this product matches your specifications.
• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and
without incurring obligations.
• The water supply pressure should not exceed 80 psi. If this occurs, a pressure reducing valve with a bypass should be
installed in the cold water inlet line.
• Maximum flow may require water pressure equal to or greater than 40 psi.
6
•
Electric Tankless Water Heater
Electrical Requirements
Follow these steps to determine the electrical requirements for your water heater:
1.) Find your model number on your water heater’s rating plate.
2.) Locate the model number in the table listed below.
GENERAL INFO
•
For example, if your model is UPVA-18K, find *P**-18K. Sorted by Voltage first, then by total
Wattage (KW).
•
Follow the requirements listed for your model.
•
Use copper conductors only.
Point-of-Use Models
(For potable water heating only. Not for space heating.)
NOTICE: Models sorted by Voltage, then by Wattage per Element.
Model Number
Voltage
Number of
Elements
Total Input
(KW)
Wattage
per
Element
Total Current
Draw (Amps)
Recommended
U. S. Circuit
Breaker Size
(Amps)
Conductor Size
(AWG)^
UPV*-18K
120
2
1.75
0.88
14.58
15
14
UPV*-24K
120
2
2.40
1.20
20.00
20
12
UPV*-30K
120
2
3.00
1.50
25.00
25
10
UPV*-35K
120
2
3.50
1.75
29.17
30
10
UPV*-35E
240 †
2
3.50
1.75
14.58
15
14
UPV*-45E
240 †
2
4.50
2.25
18.75
20
12
UPV*-55E
240 †
2
5.50
2.75
22.92
25
10
UPV*-70E
240 †
4
7.00
1.75
29.17
30
10
UPV*-90E
240
4
9.00
2.25
37.50
40
8
UPV*-110E
240
4
11.00
2.75
45.83
50
8
UPV*-40Y
277
2
4.00
2.00
14.44
15
14
UPV*-55Y
277
2
5.50
2.75
19.86
20
12
UPV*-80Y
277
4
8.00
2.00
28.88
30
10
UPV*-110Y
277
4
11.00
2.75
39.71
40
8
^All wiring/conductors must be rated for 90°C or greater.
† This model may be connected to a 208 VAC supply. Connection
to 208 VAC may require different breaker and/or wire size than shown in the table.
NOTICE: Incoming line voltage variations may result in nuisance breaker trips. Contact Technical
Support if there are multiple breaker trips when the recommended breaker size is in use.
Electric Tankless Water Heater
•
7
INSTALLATION
Getting Started
Code Compliance
Clearances
•
Install and properly ground the
unit in accordance with local
codes, or in the absence of local
codes, with the current edition
of the National Electrical Code:
ANSI/NFPA 70 in the USA.
INSTALLATION
Top Clearance: A minimum of
12 inches (30.5 cm) is required
to provide access for plumbing
connections.
Side Clearance: Allow an 8 inch (20.3 cm)
minimum horizontal space for the
heater. This horizontal clearance will
allow for the removal of protective
cover screws and provide access to
electrical wires that will enter the
heater from the side.
Bottom Clearance: At a minimum,
maintain a bottom clearance of 12
inches (30.5 cm) to allow for removal
and maintenance of heating elements.
Do not store any items underneath the
water heater.
Front Clearance: Maintain a
minimum clearance of 8 inches (20.3
cm). In the absence of a door or
removable access panel in front of the
heater, allow a minimum of 15 inches
(38.1 cm) front clearance. This will
allow for cover removal and ease of
service. See Figure 2.
•
include crawl space under a house
or building, in the garage (in
regions prone to high humidity)
and in the attic (unless the attic
has been converted to a living
space).
•
Locate your water heater where it
will not be accessible to children.
WARNING! This water heater
can make water hot enough to
cause severe burns instantly,
resulting in severe injury or death.
•
Be sure that your water heater
is accessible and that minimum
clearances are observed. Do
not store any items underneath
the water heater, and do not
store flammable liquids or other
flammable materials near the
water heater. This is important
for safety and future service. See
Figure 2.
•
Do not install your water heater
where condensate may drip onto
the water heater.
•
A drain pan, or other means of
protection against water damage,
is recommended to be installed
under the water heater in case of
leaks. In addition, you may install
an active water leak detector with
a shutoff valve which can turn off
the water supply in the event of
a leak. The manufacturer is not
responsible for damage due to
water leaks. See Figure 2.
Follow all other applicable
plumbing, heating, and air
conditioning codes during
installation.
Choose a
Location
1
•
Your water heater is designed to
be installed indoors only.
•
Locate your water heater in a
clean, dry area that is as close to
the point of use as possible. Do
not install it in a bath enclosure
or shower stall.
•
Your water heater and water lines
must be protected from freezing.
Do not install your water heater
where it may be subjected to
freezing temperatures.
•
Avoid locations that are prone
to dampness, high humidity,
moisture, or dust. Such locations
Figure 2 - Clearance Specifications
Minimum Clearances
Wall
Side View
12”
(30.5 cm)
Front
View
Wall or
adjacent
object
2
°F
°C
8”
(20.3 cm)
ENTER
8”
(20.3 cm)
Front Clearance:
15” + (38.1 cm +)
12”+
(30.5 cm +)
Drain Pan
8
•
Drain Pan
Floor
Electric Tankless Water Heater
12”+
(30.5 cm +)
Mount Your
Water Heater
1.
Unpack the heater from the
shipping carton, but do not cut
the shipping carton with a sharp
instrument.
2.
Stand the unit upright and
remove the plastic wrap.
Remove the screws that secure
the protective cover.
4.
Remove the cover.
5.
Locate the four mounting holes
in the back plate. Locate and
use the point-of-us mounting
template, located on page 32.
6.
Determine the mounting location
on the wall, then verify your
clearances. (See “Clearances” on
page 8.)
7.
Position the unit against the wall.
Make sure that the unit is level.
NOTICE: All models must be
oriented with the inlet and
outlet facing upward. See Figure
3.
8.
Secure the water heater to the
wall or other suitable structure
with screws, bolts, or anchors as
appropriate. Ensure the mounting
surface and fasteners will support
the weight of the water heater.
See General Specifications for
unit weights, page 6. (You will
reinstall the water heater’s
protective cover later.)
Visual
Example:
3
NOTICE:
• DO NOT apply heat to the water
lines, nipples, or any fitting on the
water heater. Heat from soldering
may damage the water heater.
• Thread sealing tape (plumber’s
tape) is the only sealer that may
be used on the threads of the
inlet and outlet fittings. DO NOT
use pipe dope or PVC/CPVC
primer and glue on the threads
of the inlet and outlet fittings.
Exposure to these compounds
will damage the nipples, causing
leaks.
•
•
•
•
•
•
•
•
NOTICE: All models must be oriented
with the inlet and outlet facing upward.
Figure 3 - Point of-Use Orientation
Connect the Water Lines
•
The POU water heaters have a
retaining plate that keeps the
inlet and outlet nipples from
turning freely. Use only one
wrench when attaching the hot
and cold water lines to the heater.
Flexible water supply hoses
are recommended for your
installation.
Well water must be treated.
Only potable water can be used
with this water heater. Do not
introduce pool or spa water, or
any chemically treated water into
the water heater.
Do not connect to a saltregenerated water softener or a
water supply of salt water.
The warranty will not cover
damage caused by water quality.
Recommended operating
pressure: 50 to 60 psi. Higher
pressures require a pressure
reducing valve.
Installations above the ceiling or in
an attic require a bleed air separator.
A properly-sized arrestor should
be installed where water hammer
exists.
Hot
Cold
°F
°C
ENTER
Figure 4 - Hot and Cold Water Lines
Installed
NOTICE: Do not supply electrical
power to your water heater yet. If you
do so at this point, you will damage
your heating element(s).
1.
Make sure that the water supply
is turned off.
2.
Connect the hot water line to the
hot outlet of the water heater.
(Figure 4.)
3.
Connect the cold water line to
the cold inlet of the water heater.
(Figure 4.)
4.
Open the valve on the main water
line to supply water to the heater.
5.
Open several hot water fixtures
and allow water to run through
the water heater for several
minutes to purge air from the
water lines.
6.
Check for water leaks. Correct any
that are found.
7.
If you installed a T&P valve to
meet local code requirements,
operate it manually several
times to allow any trapped air to
escape.
NOTICE: Failure to purge air from
the water lines can leave air pockets,
causing damage to the heating
elements when power is applied.
Electric Tankless Water Heater
•
9
INSTALLATION
3.
Install Electrical
Service
4
WARNING! Failure to observe
these warnings could lead to an
improper installation, and the risks
include fire, electrical shock, and/or
death:
INSTALLATION
•
•
•
•
•
Installation must be performed
by a qualified installer. The
installer (licensed professional)
is responsible for the correct
installation of the water heater
and for compliance with all
national, state / provincial, and
local codes.
Refer to the electrical
requirements and electrical
schematic during installation and
service.
Turn off power service at the
main circuit breaker(s) prior
to installation. Working on an
energized circuit can result in
severe injury or death from
electrical shock.
Some models may be connected to
more than one branch circuit, and
more than one disconnect switch
may be required to de-energize
the equipment. All branch circuits
must be disconnected during
installa on or service.
Install and properly ground the
unit in accordance with local
codes, or in the absence of local
codes, with the current edition of
the National Electrical Code: ANSI/
NFPA 70.
1.
Be sure the electrical power to
the water heater is turned OFF
at the circuit breaker panel (or
remove the circuit’s fuses).
2.
Using a non-contact circuit tester,
check the wiring to make certain
the power is OFF.
3.
Check the water heater’s ra ng
plate and ensure that the
electrical service’s voltage, wiring
size (ampacity) and circuit breaker
ra ng/type are correct for this
water heater.
NOTICE: The electrical requirements
for your model are listed in “Electrical
Requirements,” page 7.
4.
Do the following:
□ Check all electrical
connections to make sure
that they are correct and
secure.
□
6.
7.
Verify proper operation.
Operating instructions are listed
on page 11.
Label all breakers/
connections to the water
heater.
Ensure that all air has been
purged from the water lines
by opening several hot water
fixtures near the water heater.
Run water through the water
heater until all air is purged from
the lines.
Reinstall the water heater’s cover.
Electric Tankless Water Heater
Test Water
Heater Operation
5
NOTICE: Before performing the
following steps, ensure the air is
purged from the water lines leading to
the faucet. Refer to ”Installation,” step
3, page 9.
1.
At the faucet, install the
recommended faucet aerator
provided with this Point-Of-Use
electric tankless water heater for
optimal performance. The aerator
may enable more consistent
output and flow of hot water
regardless of available water
pressure.
NOTICE: Sediment is found in many
water systems. Periodic inspection is
recommended, and cleaning of the
faucet aerator may be necessary.
2.
Make sure that the
supply voltage, wiring
size (ampacity), circuit
breaker rating and type are
correct. Refer to “Electrical
Requirements,” page 7.
WARNING! Be sure the cover is
secured to reduce the risk of fire and
electric shock.
•
9.
At the hot water faucet, turn the
water on medium-low.
□
□
NOTICE: When using stranded wire,
make sure that all strands are secure
inside the terminal block. A loose
strand can cause a short circuit and
damage the circuit board.
10
Turn on power to the water
heater.
Connect the electrical service
as described in “Electrical
Requirements,” page 7.
There is a wiring diagram label on
the inside of your water heater’s
protective cover. See also “Wiring
Diagrams,” pages 28 and 29.
5.
8.
3.
You should hear a “click” as
the heater’s relays engage.
□ You may hear a hissing or
crackling noise from the heat
exchanger after the unit
begins to heat water. This is
normal.
Check water at the fixtures to
make sure that the water is being
heated.
NOTICE: Your water heater includes
on-board self diagnos cs. If water
heater powers up but does not heat
water, shut off power to the unit.
Reverse the top pair of L1 and L2 leads
on the terminal strip. Apply power and
check again. See “Troubleshoo ng” for
more informa on (pages 13 - 15).
OPERATION
Water Temperature
Adjustment
Manually switching between
modes:
1.
WARNING
Scalding Risk
This water heater
can make water hot
enough to cause
severe burns
instantly, resulting in severe injury or
death. Before a emp ng to adjust the
temperature set point, read “RISKS
DURING OPERATION” on page 3. If
the instruc ons are not clear, contact a
qualified service technician.
Emergency Eye Wash Mode
(Optional)
The water temperature set point
can be adjusted within a range of
80°F (27C) and 150°F (66 °C) while
in lavatory mode. To adjust the
temperature setting for all point of
use models in lavatory mode:
1.
Press and release either the UP
or DOWN button. The display
will blink and allow you to adjust
the temperature set point. Press
the UP or DOWN button to scroll
through the temperatures. See
Figure 7.
2.
Press the ENTER button to
confirm.
°F
°C
ENTER
Remove the
four screws.
^ĐƌĞǁůŽĐĂƟŽŶ͘
Figure 5 - Removing the front cover.
2.
Locate and remove the jumper.
Place the jumper on the pins
corresponding to the desired
mode. Test the operation of the
water heater to ensure that it is
operating as desired. See Figure
6.
INLET
TEMPERATURE
MODE JUMPER
Lavatory Mode (Factory
PreSet)
The factory water temperature set
point when in lavatory mode is 105°F
(+/-1°F). The water temperature set
point can be adjusted within a range of
80°F (27C) and 150°F (66 °C).
Side View (Right)
NOTICE: Water temperatures at the
hot water fixture may be lower than
the water heaters set point, depending
on the distance from the water heaters
outlet to the hot water fixture.
Not Used
Lavatory
(140 F)
Eye Wash
(85 F)
F
C
ENTER
Jumper
Figure 6 - Temperature mode jumper.
To toggle between Fahrenheit and
Celsius:
1.
Press and hold the DOWN button
for five seconds. See Figure 7.
2.
The °F or °C LED will illuminate,
and the 7-segment LED will
display the temperature set point
in the appropriate units.
NOTICE: When toggling back and
forth from °F to °C, the set point may
be reduced slightly below the desired
temperature (due to decimal rounding during conversion calcula ons). To
adjust the set point temperature, follow steps 1 and 2 for Adjus ng Water
Temperature.
The emergency eye wash mode water
temperature is factory preset to 85 °F
(29 °C) and is Non-adjustable.
Electric Tankless Water Heater
•
11
OPERATION
The point of use model has two
modes, designed to meet specific
demands and uses: Lavatory and
Emergency Eye Wash.
Remove the front cover on the
point-of-use unit by removing the
two screws from the left and two
from the right of the cover. With
the screws removed, gently pull
the cover away from the unit and
place the cover out of the way.
See Figure 5.
FrontView
To adjust the temperature se ngs, refer to one of the following procedures.
NOTICE: If installing a point of use
(POU) water heater as a secondary
or standby unit, the max inlet water
temperature coming into the POU unit
cannot exceed 135 °F. The thermostat
setpoint on the primary water heater
will need to be adjusted accordingly.
Adjusting Water Temperature
Figure 7 - Point of Use Display
°F
°C
Temperature Units (°F or °C)
One will be lit if power to the
water heater is on.
hƉĂŶĚŽǁŶƵƩŽŶƐ
(adjust the set temperature)
ENTER
ŶƚĞƌƵƩŽŶ
(Set)
OPERATION
User Interface Module (UIM)
Need Assistance?
Call our Technical Assistance Hotline at 1-877-817-6750.
We can help you with installa on, opera on, troubleshoo ng,
or maintenance. Before you call, write down the model and serial
number from the water heater’s data plate.
12
•
Electric Tankless Water Heater
TROUBLESHOOTING
Error Codes for Point-of-Use Models
WARNING
Electric Shock Risk
Contact with the electrical parts inside the water heater can result in severe injury or death from electrical shock:
• Disconnect power by opening the circuit breaker(s) or removing the fuses before installing or servicing.
• Some models are connected to more than one branch circuit, and more than one disconnect switch may be
required to de-energize the equipment. All branch circuits must be disconnected prior to service.
On the point of use unit, the 7-segment display will show an error code when a fault is found in the control board.
See Figure 8, page 15. A er you iden fy the fault code, locate its descrip on and solu on in the table.
NOTICE:
• There may be mul ple codes; verify all sequences.
• If there are mul ple fault codes, the display will pause between each one. The fault codes will then repeat.
Display Fault
Code
002
Description
Overheat:
•
Heat is above the so ware’s desired
limit.
Action / Solution
1.
2.
3.
4.
5.
6.
7.
If the water heater is in Lavatory mode reduce the set point temperature.
If problem persists turn off all power to the water heater.
Open a nearby hot water fixture and allow water to run through the
heater for about 5 minutes.
Check the resistance of the temperature sensors (thermistors). If one
of the thermistors has a resistance that is much higher than the others,
replace that thermistor.
If problem persists turn off all power to the water heater.
Drain the water heater.
Remove the elements and inspect the housings for scale buildup. Remove
any clogs that are present.
Chamber 1 Thermistor:
•
Chamber 1 thermistor shows open.
•
Chamber 1 thermistor shows a
short.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check the connec ons of the thermistor in ques on.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the thermistor.
004
Chamber 2 Thermistor:
•
Chamber 2 thermistor shows open.
•
Chamber 2 thermistor shows a
short.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check the connec ons of the thermistor in ques on.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the thermistor.
005
So ware Error:
•
A so ware ming error has been
detected.
1.
2.
Turn off power to the water heater.
The circuit board will need to be replaced. Contact Technical Support.
006
Hardware Error:
•
The power supply output is too low.
•
An issue with so ware interrupts is
detected.
•
An issue with process registers is
detected.
•
An issue with program counter is
detected.
•
An issue with the clock is detected.
•
The flash CRC check has failed.
1.
2.
Turn off power to the water heater.
The circuit board will need to be replaced. Contact Technical Support.
TROUBLESHOOTING
003
Continued on the next page...
Electric Tankless Water Heater
•
13
TROUBLESHOOTING
Display Fault
Code
Description
Action / Solution
006
Hardware Error:
•
An issue with RPM memory is
detected.
•
An issue with heater control circuit
is found.
•
The user flash check has failed.
•
Mode selec on jumper missing or
shorted.
1.
Turn off power to the water heater and contact Technical Support
008
User Interface:
•
Bu on malfunc on detected.
1.
Turn off power to the water heater and contact Technical Support
009
AC Supply:
•
Line frequency too high or too low.
1.
2.
3.
4.
Turn off power to the water heater.
Check the AC wiring connec ons.
Turn on power to the water heater.
If the fault code remains or reoccurs, contact Technical Support.
025
Chamber 3 Thermistor:
•
Chamber 3 thermistor shows open.
•
Chamber 3 thermistor shows a
short.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check the connec ons of the thermistor in ques on.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the thermistor.
026
Chamber 4 Thermistor:
•
Chamber 4 thermistor shows open.
•
Chamber 4 thermistor shows a
short.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check the connec ons of the thermistor in ques on.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the thermistor.
027
Outlet Thermistor:
•
Outer thermistor shows open.
•
Outer thermistor shows a short.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check the connec ons of the thermistor in ques on.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the thermistor.
031
Leak Detect:
•
Leak detected.
1.
2.
3.
4.
5.
Turn off power to the water heater.
Check for plumbing leaks and correct accordingly.
If the water heater is leaking, replace the unit.
Dry the leak sensor and circuit board completely before restoring power.
Turn on power to the water heater. Check for plumbing leaks and correct accordingly.
043
Flow Sensor:
•
Flow sensor not detected.
1.
2.
3.
4.
Turn off power to the water heater.
Check the wire connec ons to the flow sensor.
Turn on power to the water heater.
If the fault code remains or reoccurs, replace the flow sensor.
331
Scale Build Up Error:
•
Scale has built up inside the
chamber
1.
2.
Turn off power to the water heater.
Drain and Clean the water heater as shown in the Scale Buildup Cleaning
Instruc ons under the Service and Maintenance Sec on.
Turn on power to the water heater.
If the fault code remains, contact Technical Support.
3.
4.
332
Scale Build Up Error - 4 Chamber:
•
Scale has built up inside chamber 1
or 2.
•
Unit will con nue to operate off of
chamber 3 and 4.
Continued on the next page...
14
•
Electric Tankless Water Heater
1.
2.
3.
4.
Turn off power to the water heater.
Drain and Clean the water heater as shown in the Scale Buildup Cleaning
Instruc ons under the Service and Maintenance Sec on.
Turn on power to the water heater.
If the fault code remains, contact Technical Support.
Display Fault
Code
333
Description
Scale Build Up Error - 4 Chamber:
•
Scale has built up inside chamber 3
or 4.
•
Unit will con nue to operate off of
chamber 1 and 2.
Action/Solution
1.
2.
3.
4.
Turn off power to the water heater.
Drain and Clean the water heater as shown in the Scale Buildup Cleaning
Instruc ons under the Service and Maintenance Sec on.
Turn on power to the water heater.
If the fault code remains, contact Technical Support.
* These instruc ons are brief and intended as guidance for a qualified person. If you lack the necessary skills to perform these
procedures call the Technical Assistance Hotline which is listed on the water heater’s warranty sheet for assistance.
Figure 8 - Fault Code Display Example
F
C
TROUBLESHOOTING
ENTER
Electric Tankless Water Heater
•
15
MAINTENANCE
Routine Maintenance
Routine maintenance will help your
water heater last longer and function
properly. If you cannot perform
these routine maintenance tasks
yourself, contact a qualified person.
IMPORTANT! Failure to perform
required or recommended
maintenance as described in the
following section may void the
warranty.
Water Heater
Maintenance
After the first six months, drain
and clean the water heater and
inspect the elements, chambers, and
chamber thermistors. Depending on
the hardness of your water, repeat
this process at least annually, or
more frequently if needed.
MAINTENANCE
WARNING!
Electric Shock Risk
Servicing should be performed on this water heater
only a er it has been disconnected
from the power supply circuit(s).
Failure to do so can result in severe
injury or death from electrical shock:
WARNING!
• Working on an energized circuit
can result in severe injury or
death from electrical shock. Turn
power off.
• Some models are connected to
more than one branch circuit.
Disconnect all branch circuits
before servicing unit.
• Check wires with a non-contact
circuit tester to make sure power
is off. When you are finished,
be sure all covers are secured to
reduce the risk of fire and electric
shock.
Accessing Heating
Elements
1
Confirm that power is off by
checking the wires with a
non-contact circuit tester.
2
Open a nearby hot water
faucet and run the water
until it is cool.
WARNING! Be sure the water runs
cool before draining the water heater
to reduce the risk of scalding.
3
Close the inlet valve to the
water heater, but leave the
hot water faucet open to
relieve pressure.
Cover the top of the water
heater with towels (to prevent
water from dripping through
the openings) and place a bucket
under the water heater to catch any
water that might spill. A er the towels
and bucket are in place, disconnect the
inlet and outlet water lines from the
water heater.
NOTICE: There is a retaining plate
around the inlet and outlet nipples. A
single wrench is all that’s necessary to
unscrew the inlet and outlet lines.
4
Remove the top two access
plugs located next to the
outlet nipple with a flat
head screwdriver. See Figure 10.
Figure 9 - Non-Contact circuit tester
16
•
Side View (Right)
°F
°C
ENTER
^ĐƌĞǁůŽĐĂƟŽŶ͘
Remove the
four screws.
Figure 11 - Accessing Point-of-Use Control
Board
Element Removal
If you are not comfortable removing
the hea ng elements yourself, contact
a qualified person. To remove the heating elements, you’ll need the following
tools and supplies:
•
•
•
•
Phillips head screwdriver
Bucket
Rag
Hair dryer or compressed air
Viewing the bottom of the
unit with the front cover
removed, take a moment to
note how the elements are installed.
See Figure 12.
1
Bottom View
Element
Mounting Screws
Elements
5
Element Wire
Terminal Screws
Remove Access Plugs
Note: Element wires removed for clearity.
Figure 12 - Bottom view, element(s).
Using a Phillips screwdriver,
loosen the two element wire
terminal screws and disconnect the element wires. Bend the
element wires out of the way.
NOTICE: Use masking tape to label
the red and black element wires to
the corresponding chamber. For the
unit to func on properly, it is crucial the
elements are installed and wired in the
correct orienta on. Refer to the wire
diagram found inside the front cover or
in this manual.
2
Figure 10 - Removing access plugs.
ON
OFF
Front View
Use a Phillips screwdriver to
remove the four screws
securing the front cover.
Remove the heater’s front cover. See
Figure 11.
Electric Tankless Water Heater
6
With the element wires out
of the way, use a Phillips
screwdriver to remove the
two moun ng screws securing the
element in the chamber. Place the p
of a flat head screwdriver between
the element moun ng bracket and
chamber housing to gently pry the
element away from the chamber. Pull
the element down and out of the
chamber. Use a towel to clean up any
water that might spill from the
chamber. See Figure 13.
NOTICE: Protect the circuit board from
any water. Complete the following
steps before the removal and cleaning
of addi onal elements.
3
Figure 13 - Removing the element(s).
Inspect the copper sheathing
of the elements. If the copper
sheathing has splits or cracks,
replace it with a new element. See the
“Element Removal and Replacement
Section.”
5
Inspect the chambers for dark
brown or black spots. This is
an indication of chamber
overheating. If dark brown or black
spots are present, contact Technical
Support.
6
Chamber
Alignment Notch
IMPORTANT! At least annually,
inspect elements, chambers, and
thermistors for scaling or damage
caused by corrosive water condi ons
and mineral deposits a er the first
inspec on performed six months a er
ini al installa on of the unit.
Use a so bristle brush to remove
scale from the elements and a non
metal bristle pipe cleaner to remove
any scale buildup from inside the
chambers. If necessary, soak the
elements in cider vinegar for two
hours to remove scale. NOTICE: At
this me, we recommend inspec ng
the thermistors and cleaning them
with a so bristle brush. DO NOT soak
thermistors in cider vinegar. Reference
“Chamber Thermistor Replacement,”
(page 21) for instructions on how to
remove and reinstall the chamber
thermistors.
IMPORTANT! Failure to clean scaling
from elements and chambers can lead
to scale buildup and premature failure
(leaks) in the chambers resulting in
property damage. Replace the heating
elements if necessary. If dark brown
or black spots are present on the
chambers, contact Technical Support.
Install the Elements
Before installing the elements,
make sure the O-ring is
lubricated with dish soap or a
food safe silicon lubricant and properly
installed onto the element.
1
Install the element, ma ng
the element slot with the
chamber alignment notch.
Secure the element by sequen ally
ghtening the moun ng bracket
screws. DO NOT over ghten screws.
See Figure 14.
NOTICE: To prevent damage to the
element moun ng bracket do NOT
ghten the screws down completely
one at a me.
2
Element
Alignment Slot
Figure 14 - Chamber Alignment Notch, Element Slot.
Secure the red and black wires
to the corresponding hea ng
element(s). Use the two screws
previously loosened.
3
Return the heater to service
by follow the instructions in
“Returning the Water Heater
Back to Service” (page 18).
4
Turn on a nearby hot water
faucet to fill the heater with
water. Continue until all air has
been expelled from the heater and
pipes. If a T&P valve is installed, operate
it manually several times to allow any
trapped air to escape.
5
6
Check for water leaks and
correct any leaks that are
found.
NOTICE: Most leaks occur at connecons and are not a chamber leak. Do
not proceed to the next step un l the
circuit board and components are completely dry.
Reinstall the front cover
reusing the four screws
previously removed along
with the top access plugs.
7
The water heater is now ready
for normal opera on. Turn
the electric power on at the
circuit breaker panel, or fuse box to
energize the water heater. Once
complete, proceed to the Operations
section of the owner’s manual.
NOTICE: If the system diagnostic yields
any codes, check wire connections.
Reference the diagnostic codes section in the manual if code(s) are still
present.
8
Electric Tankless Water Heater
•
17
MAINTENANCE
Inspect the elements and the
chambers for any scale
buildup. If any scale has
formed on the elements or the
interior of the chambers, clean the
unit as described in the “Cleaning
Heating Elements and Chambers
Section.”
4
Cleaning Hea ng
Elements and
Chambers
SERVICE/REPAIR
Servicing the Water
Heater
WARNING!
•
Working on an energized circuit
can result in severe injury or
death from electrical shock. Turn
power off.
Some models are connected to
more than one branch circuit.
Disconnect all branch circuits
before servicing unit.
Check wires with a non-contact
circuit tester to make sure power
is off. When you are finished,
be sure all covers are secured to
reduce the risk of fire and electric
shock.
•
•
Draining the Water Heater
Confirm that power is off by
checking the wires with a
non-contact circuit tester.
1
Open a nearby hot water
faucet and run the water
until it is cool.
2
WARNING! Be sure the water runs
cool before draining the water heater
to reduce the risk of scalding.
Close the inlet valve to the
water heater, but leave the
hot water faucet open to
relieve pressure.
3
If needed, remove the top
two access plugs located
next to the outlet nipple
with a flat head screwdriver. See
Figure 15.
SERVICE/REPAIR
4
Remove Access Plugs
Figure 15 - Removing access plugs.
18
•
Use a Phillips screwdriver to
remove the four screws
securing the front cover.
Remove the heater’s front cover. See
Figure 16.
5
Front View
Side View (Right)
°F
^ĐƌĞǁůŽĐĂƟŽŶ͘
Figure 16 - Accessing Point-of-Use Control
Board
Cover the top of the water
heater with heavy towels (to
prevent water from dripping
through the openings) and place a
bucket under the water heater to
catch any water that might spill. A er
the towels and bucket are in place,
disconnect the inlet and outlet water
lines from the water heater.
NOTICE: There is a retaining plate
around the inlet and outlet nipples. A
single wrench is all that’s necessary to
unscrew the inlet and outlet lines.
6
Remove the hea ng elements
as described in “Element
Removal and Replacement,”
(pages 19 - 20).
7
Inspect the elements,
thermistors, and the
chambers for any scale
buildup. If any scale has formed on
the elements, thermistors, or the
interior of the chambers, clean the
unit as described in the “Cleaning
Heating Elements and Chambers
Section,” (page 17).
8
IMPORTANT! Failure to clean scaling
from elements and chambers can lead
to corrosion and premature failure
(leaks) in the chambers resulting in
property damage. Replace the heating
elements if necessary. If dark brown
or black spots are present on the
chambers, contact Technical Support.
Electric Tankless Water Heater
10
Reinstall the front cover
followed by the inlet and outlet
water lines to the water heater.
Returning the Water Heater to
Service
°C
ENTER
Remove the
four screws.
Reinstall the hea ng elements
as described in “Element
Removal and Replacement,”
(pages 19 - 20).
9
1
Turn on the WATER supply to
the heater.
Turn on a nearby hot water
faucet to fill the heater with
water. Continue until all air has
been expelled from the heater and
pipes. If a T&P valve is installed, operate
it manually several times to allow any
trapped air to escape.
2
3
Check for water leaks and
correct if found.
NOTICE: Do not restore power until
the circuit board and components are
completely dry. If water has dripped
anywhere inside the heater, dry it with
a hair dryer or compressed air. Be sure
to dry behind the circuit board.
If there are no water leaks,
reinstall the water heater’s
cover and access plugs (if
removed).
WARNING! Be sure the cover is
reinstalled and secured to reduce the
risk of fire and electric shock.
4
5
Restore power to the water
heater. Verify proper
operation.
Replacement Parts
The following parts may be ordered
through your retailer or local
plumbing wholesaler:
• Heating Elements
• Outlet and/or Chamber
Thermistors
(temperature sensors)
• Flow Sensor
• Control Board
• Nipples (inlet and/or outlet)
When ordering replacement parts,
please be ready to provide the water
heater model and serial numbers.
WARNING!
Electric Shock Risk
Servicing should be performed on this water heater
only a er it has been disconnected
from the power supply circuit(s).
Failure to do so can result in severe
injury or death from electrical shock:
WARNING!
Working on an energized circuit
can result in severe injury or
death from electrical shock. Turn
power off.
• Some models are connected to
more than one branch circuit.
Disconnect all branch circuits
before servicing unit.
• Check wires with a non-contact
circuit tester to make sure power
is off. When you are finished,
be sure all covers are secured to
reduce the risk of fire and electric
shock.
Element Removal and
Replacement
Bottom View
If you are not comfortable replacing
a hea ng element yourself, contact a
qualified person. To replace the heating element, you’ll need the following
tools and supplies:
•
•
•
•
Phillips head screwdriver
Bucket
Rag
Hair dryer or compressed air
1
Using a Phillips screwdriver,
loosen the two element wire
terminal screws and disconnect the element wires. Bend the
element wires out of the way.
NOTICE: If replacing more than one
element, use masking tape to label
the red and black element wires to
the corresponding chamber. For the
unit to func on properly, it is crucial the
elements are installed and wired in the
correct orienta on. Refer to the wire diagram found inside the front cover and/or
in the manual.
5
Point-of-use Models
With the element wires out
of the way, use a Phillips
screwdriver to remove the
two moun ng screws securing the
element in the chamber. Place the p
of a flat head screwdriver between
the element and chamber housing to
gently pry the element away from the
chamber. Pull the element down and
out of the chamber. Use a towel to
clean up any water that might spill
from the chamber. See Figure 20.
NOTICE: Protect the circuit board from
any water. If replacing addi on elements, complete the following steps
before the removal and replacement
of addi onal elements.
6
Figure 18 - Heating elements
2
3
Confirm that power is off by
checking the wires with a noncontact circuit tester.
Follow the instructions on
page 18 for draining the
water and removing the front
cover to the unit.
WARNING! To reduce the risk of
scalding, make sure the water runs
cool before you proceed.
Viewing the bottom of the
unit with the front cover
removed, take a moment to
note how the elements are installed.
See Figure 19.
4
Electric Tankless Water Heater
•
19
SERVICE/REPAIR
NOTICE: A built-in alarm is also
included. If water leaks inside your
electric water heater, an alarm will
sound to provide warning. Turn off
power to the water heater at the
circuit breakers, turn off the water
supply, then correct the leak.
Element Wire
Terminal Screws
Figure 19 - Bottom view, element(s).
Check your water heater’s data
plate for the correct wattage
and voltage. Verify that your
new heating element has the
correct wattage rating and is
sized correctly for your water
heater. Reference “Electrical
Requirements Table,” (page 7).
ON
Figure 17 - Non-Contact circuit tester
Elements
Note: Element wires removed for clearity.
•
OFF
Element
Mounting Screws
Return the heater to service
by follow the instructions in
“Returning the Water Heater
Back to Service’” (page 18).
4
Turn on a nearby hot water
faucet to fill the heater with
water. Continue until all air has
been expelled from the heater and
pipes. If a T&P valve is installed, operate
it manually several times to allow any
trapped air to escape.
5
Figure 20 - Removing the element(s).
6
Installing The New Element(s)
Before installing the new
element, make sure the o-ring
is lubricated with dish soap or
a food safe silicon lubricant and
properly installed onto the element.
1
Install the element, ma ng
the element slot with the
chamber alignment notch.
Secure the element by sequen ally
ghtening the moun ng bracket
screws. DO NOT over ghten screws.
See Figure 21.
NOTICE: To prevent damage to the
element moun ng bracket do NOT
ghten the screws completely one at
a me, alternate ghtening each
screw If replacing the element with the
ground wires sharing the same mounting
screw, remember to reinstall the ground
wires previously removed.
2
Chamber
Element
SERVICE/REPAIR
Alignment Notch
Alignment Slot
Figure 21 - Chamber Alignment Notch, Element Slot.
Secure the red and black wires
to the corresponding hea ng
element(s). Use the two screws
previously loosened.
3
20
•
Check for water leaks and
correct any leaks that are
found.
NOTICE: Most leaks occur at connecons and are not a chamber leak. Do
not proceed to the next step un l the
circuit board and components are completely dry.
NOTICE: Reference the illustra on on
page 30 for a larger view of the thermistor loca ons.
1
Drain the water heater and
remove the front cover as
described in “draining the
water heater,” page 18.
2
With the front cover removed, take a moment to
note how the outlet thermistor is installed and which
control board terminal the
wire harness is plugged into.
See Figure 22.
3
Reinstall the front cover
reusing the four screws
previously removed along
with the top access plugs.
Outlet Thermistor
>ŽĐĂƟŽŶ
7
The water heater is now ready
for normal opera on. Turn
the electric power on at the
circuit breaker panel, or fuse box to
energize the water heater. Once
complete, proceed to the Operations
section of the owner’s manual.
NOTICE: If the system diagnostic yields
any codes, check wire connections.
Reference the diagnostic codes section in the manual if code(s) are still
present.
Turn off power to the water
heater.
Outlet Thermistor
ŽŶƚƌŽůŽĂƌĚ
dĞƌŵŝŶĂů>ŽĐĂƟŽŶ
8
Outlet Thermistor
(Temperature Sensor)
Replacement
If you are not comfortable replacing
a thermistor yourself, have this work
done by a qualified person. To replace
an outlet thermistor, you’ll need the
following tools/supplies:
•
•
•
•
•
Electric Tankless Water Heater
Phillips Screwdriver (Magnetic)
Non-Contact Circuit Tester
Needle Nose Pliers
Bucket (for draining the heater)
Towels
Figure 22 - Chamber thermistor location.
4
Unplug the thermistor’s wire
connector from the control
board. See Figure 23.
TH-Out
TH-Out
NOTE: Chamber thermistor wires removed for clarity.
Figure 23 - Proper outlet thermistor
installation.
Use a Phillips screwdriver to
remove the screw securing
the outlet thermistor retainer
to the chamber.
Chamber Thermistor
(Temperature Sensor)
Replacement
Gently remove the outlet
thermistor with a pair of
needle nose pliers, grabbing
only the metal body of the thermistor
and not the wire.
If you are not comfortable replacing
a thermistor yourself, have this work
done by a qualified person. To replace
a chamber thermistor, you’ll need the
following tools/supplies:
5
6
NOTICE: Make sure the O-ring is removed with the chamber thermistor.
Installing The New Outlet
Thermistor
Before installing the new
outlet thermistor, make sure
the O-ring is lubricated and
properly installed. See Figure 24.
1
Outlet Thermistor
•
•
•
•
•
•
TOP VIEW
Outlet Thermistor
Washer
O-ring
Figure 24 - Outlet thermistor with o-ring..
Plug the outlet thermistor’s
wire connector into the
control board. See Figures 22
and 23, page 20.
4
TH4
TH1
TH2
TH3
TH4
Use a Phillips screwdriver to
remove the screw securing
the chamber thermistor
retainer to the chamber.
3
NOTICE: Reference the illustra on on
page 27 for a larger view of the thermistor loca ons.
Gently remove the chamber
thermistor with a pair of
needle nose pliers, grabbing
only the metal body of the thermistor
and not the wire.
NOTICE: Make sure the O-ring is removed with the chamber thermistor.
4
With the front cover removed, take a moment to
record or photograph how
the chamber thermistor is installed
and which control board terminal the
wire harness is plugged into. See
Figure 25.
Installing The New Chamber
Thermistor
WARNING! Miswiring the control
board upon reinstallation can result in
water hotter than the thermostat
setting, increasing the risk of scalding,
severe burns, serious injury and
death.
Chamber Thermistor
Before installing the new
chamber thermistor, make
sure the o-ring is lubricated
and properly installed. See Figure 27.
1
Chamber Thermistor
ŽŶƚƌŽůŽĂƌĚ
dĞƌŵŝŶĂů>ŽĐĂƟŽŶ
Chamber Thermistor
>ŽĐĂƟŽŶdžĂŵƉůĞ
O-ring
Chamber Thermistor
Retainer
Figure 27 - Chamber thermistor with o-ring.
3
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 18.
TH2
Figure 25 - Chamber thermistor location.
Unplug the chamber thermistor wire harnesses from the
control board.
NOTICE: If replacing mul ple chamber
thermistors, use masking tape to label
the chamber to the corresponding
control board terminal. See Figure 26.
2
Install the chamber thermistor and properly posi on the
retainer in place. Hand
ghten the screw snuggly against the
chamber thermistor retainer with a
Phillips screwdriver.
2
Electric Tankless Water Heater
•
21
SERVICE/REPAIR
Install the outlet thermistor
and properly posi on the
retainer in place. Insert the
washer onto the screw and use a
Phillips screwdriver to ghten the
screw (included with kit) snuggly
against the chamber thermistor
retainer.
2
TH1
Figure 26 - Proper chamber thermistors
installation.
Phillips Screwdriver (Magnetic)
Flat Head Screwdriver
Non-Contact Circuit Tester
Needle Nose Pliers
Bucket (for draining the heater)
Towels
1
Outlet Thermistor
Retainer
TH3
Properly plug the chamber
thermistor wire connector(s)
into the control board. Make
sure the chamber thermistor wire
harness connec ons are connected to
the proper control board terminals.
See Figures 25 and 26.
With the control board and
triac board(s) moun ng
screws removed, gently pull
the control board with tray away and
down from the assembly. Secure the
control board out of the way.
NOTICE: DO NOT pull or place stress
on any of the wires s ll connected to
the control board.
6
3
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 18.
TH1 TH2 TH3 TH4
Flow
Sensor
TH-Out
4
Flow Sensor
Replacement
If you are not comfortable replacing
the flow sensor yourself, have this
work done by a qualified person. To
replace a flow sensor, you’ll need the
following tools/supplies:
•
•
•
•
•
Phillips Screwdriver (Magnetic)
Flat Head Screwdriver
Non-Contact Circuit Tester
Needle Nose Pliers
12 inch Adjustable Crescent
Wrench
Bucket (for draining the heater)
Towels
•
•
Triac (1)
Connection
Figure 28 - Sensors control board terminal
locations.
Unplug all the sensors and
the triac(s) connectors from
the control board. Use a
cable e or other method to secure
the wires out of the way of the control
board and chambers, to avoid
possible damage. See Figure 29.
NOTICE: If the unit is a two or four
chamber unit, use masking tape to
label the chamber thermistor wires
and their corresponding control board
terminal.
4
TH3
TH1
TH2
TH4
Figure 31 - Heat-sink/inlet tube mounting
bracket screws.
TH1
Drain the water heater and
remove the front cover as
described in “draining the
water heater,” page 18.
SERVICE/REPAIR
2
With the front cover removed, take a moment to
record or photograph how
the sensors and triac(s) are installed
and which control board terminals the
wire harnesses are plugged into. See
Figure 28.
3
Heat Sink/Inlet Tube
Mounting Bracket Screws
TOP VIEW
Turn off power to the water
heater.
1
Locate the four moun ng
screws securing the heatsink/inlet tube moun ng
brackets. Use a Phillips screwdriver to
remove the four screws and place the
brackets to the side. The assembly can
now move freely. See Figure 31.
NOTICE Secure the heat-sinks in place
for the next step by reinstalling the
two le side bracket screws. DO NOT
ghten screws.
7
TH2
TH3
TH4
Figure 29 - Thermistor wire configuration.
Locate and remove all the
mounting screws (7 total)
with a Phillips screwdriver.
See Figure 30. IMPORTANT: In
accordance with UL 499, DO NOT
remove the lower moun ng bracket
screw securing the ground wire.
5
FRONT VIEW
Chamber Mounting
Control Board
Bracket Screws
Mounting Tray
Screws
SIDE VIEW
Triac Board(s)
Mounting Screw
Remove the nipple retaining
plate by gently pulling the top
of the assembly un l the
nipple retaining plate has cleared the
back plate. Remove the nipple
retainer plate and place it out of the
way. See Figure 32.
8
Nipple
Retainer Plate
Back Plate
WARNING! Miswiring the control
board upon reinstallation can result
in water hotter than the thermostat
setting, increasing the risk of scalding, severe burns, serious injury and
death.
Figure 30 - Mounting screw locations.
22
•
Electric Tankless Water Heater
Figure 32 - Nipple retainer plate removal.
Removing The Flow Sensor
Using a flat head screwdriver
and/or needle nose pliers,
locate and remove the
retainer pins securing the flow sensor
to the upper and lower inlet tubes. See
Figure 33.
9
Upper Inlet
Tube
Flow Direction
Arrow MUST
Point Down
Flow Sensor
Retainer Pins
With the flow sensor retainer
pins removed, gently pull the
upper inlet tube out and
away from the flow sensor.
10
Remove the flow sensor off
and away from the lower
inlet tube and set the flow
sensor to the side.
11
Installing The New Flow Sensor
Before installing the new flow
sensor, make sure the new
o-rings on the upper and
lower inlet tubes are properly lubricated.
1
2
Install the upper inlet tube
into the flow sensor and
secure the upper inlet tube
to the flow sensor with second flow
sensor retainer pin. Insure the retainer
pins are fully seated against the body of
the flow sensor. See Figure 33.
Non-Contact Circuit Tester
Needle Nose Pliers
12 inch Adjustable Crescent
Wrench
Bucket (for draining the heater)
Towels
•
•
1
Drain the water heater and
remove the front cover as
described in “draining the
water heater,” page 15.
Secure the chamber in place by
reinstalling the three chamber
mounting bracket screws.
Hand tighten the Phillips screws in
place, DO NOT over tighten. See Figure
30.
Using a crescent wrench,
reconnect the water lines to
the inlet and outlet nipples. DO
NOT over tighten.
7
Reinstall the control board
assembly into place. Reusing
the screws previously
removed, secure the control board
into place. Hand ghten the screws in
place, DO NOT over ghten. See Figure
26, page 20.
8
With the front cover removed, take a moment to
record or photograph how
the sensors and triac(s) are installed
and which control board terminals the
wire harnesses are plugged into. See
Figure 34.
3
WARNING! Miswiring the control
board upon reinstallation can result
in water hotter than the thermostat
setting, increasing the risk of scalding, severe burns, serious injury and
death.
Properly reconnect the sensor
and triac(s) to the control
board, making sure the
sensor, triacs, and wire harness
connec ons are connected to the
proper control board terminals. See
Figures 28 and 29, page 22.
TH1 TH2 TH3 TH4
Flow
Sensor
TH-Out
9
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 18.
10
Inlet Nipple
Replacement
If you are not comfortable replacing
the inlet nipple yourself, have this work
done by a qualified person. To replace
a inlet nipple, you’ll need the following
tools/supplies:
•
•
Turn off power to the water
heater.
Triac (1)
Connection
Triac (2)
Connection
Figure 34 - Sensors control board terminal
locations.
Unplug all the sensors and
the triac(s) connectors from
the control board. Use a
cable e or other method to secure
the wires out of the way of the control
board and chambers, to avoid
possible damage. See Figure 35.
NOTICE: If the unit is a two or four
chamber unit, use masking tape to
label the chamber thermistor wires
and their corresponding control board
terminal.
4
Phillips Screwdriver (Magnetic)
Flat Head Screwdriver
Electric Tankless Water Heater
•
23
SERVICE/REPAIR
Install the flow sensor onto
the lower inlet tube and
secure it in place with one of
the new flow sensor retainer pins,
previously removed. See Figure 33.
NOTICE: The flow direc on arrow on
the flow sensor MUST be poin ng
down.
•
•
•
2
6
Figure 33 - Disassembling the inlet components and removing the flow sensor.
3
Secure the inlet in place with
the heat-sink/inlet tube
brackets. Hand tighten the
Phillips screws in place, DO NOT over
tighten. See Figure 32, page 22.
5
Inlet
Nipple
Flow Sensor
Lower Inlet
Tube
Reinstall the nipple retainer
plate and position/seat the
assembly into place. See Figure
32, page 22.
NOTICE: The inlet nipple and flow sensor can be rotated after installation of
the retainer pins for proper alignment
into the nipple retainer plate.
4
With the inlet nipple retainer
pin removed, gently pull the
inlet nipple out and away
from the upper inlet tube.
Heat Sink/Inlet Tube
Mounting Bracket Screws
TOP VIEW
TH1
TH3
2
Installing The New Inlet Nipple
Before installing the new inlet
nipple, make sure the new
O-ring on the upper inlet tube
is properly lubricated.
1
TH4
TH2
TH1
TH2
TH3
TH4
Figure 35 - Thermistor wire configuration.
Locate and remove all the
mounting screws (7 total)
with a Phillips screwdriver.
See Figure 36.
5
FRONT VIEW
Chamber Mounting
Control Board
Bracket Screws
Mounting Tray
Screws
SIDE VIEW
Triac Board(s)
Mounting Screw
Figure 37 - Heat-sink/inlet tube mounting
bracket screws.
Remove the nipple retaining
plate by gently pulling the top
of the assembly un l the
nipple retaining plate has cleared the
back plate. Remove the nipple
retainer plate and place it out of the
way. See Figure 38.
8
Nipple
Retainer Plate
Install the inlet nipple onto
the upper inlet tube and
secure in place with the inlet
nipple retainer pin previously removed. Insure the retainer pin is fully
seated against the body of the inlet
nipple. See Figure 38.
2
Reinstall the nipple inlet plate
and position/seat the assembly
into place. See Figure 39.
NOTICE: The inlet nipple can be rotated
after installation of the retainer pin for
proper alignment into the nipple
retainer plate.
3
Back Plate
Secure the inlet in place with
the heat-sink/inlet tube
brackets. Hand tighten the
Phillips screws in place, DO NOT over
tighten. See Figure 37.
4
Figure 36 - Mounting screw locations.
With the control board and
triac board(s) moun ng
screws removed, gentle pull
the control board with tray away and
down from the assembly. Secure the
control board out of the way.
NOTICE: DO NOT pull or place stress
on any of the wires s ll connected to
the control board.
SERVICE/REPAIR
6
Locate the four moun ng
screws securing the heatsink/inlet tube moun ng
brackets. Use a Phillips screwdriver to
remove the four screws and place the
brackets to the side. The assembly can
now move freely. See Figure 37.
NOTICE Secure the heat-sinks in place
for the next step by reinstalling the
two le side bracket screws. DO NOT
ghten screws.
Figure 38 - Nipple retainer plate removal.
Removing The Inlet Nipple
Using a flat head screwdriver
and/or needle nose pliers,
locate and remove the
retainer pin securing the inlet nipple to
the upper inlet tube. See Figure 39.
1
7
Inlet Nipple
Upper Inlet
Tube
Inlet Nipple
Retainer Pin
Flow Sensor
Figure 39 - Disassembling and removing the
inlet nipple.
•
Electric Tankless Water Heater
Using a crescent wrench,
reconnect the water lines to
the inlet and outlet nipples. DO
NOT over tighten.
6
Reinstall the control board
assembly into place. Reusing
the screws previously
removed, secure the control board
into place. Hand ghten the screws in
place, DO NOT over ghten. See Figure
36.
7
Lower
Inlet Tube
24
Secure the chamber in place by
reinstalling the three chamber
mounting bracket screws.
Hand tighten the Phillips screws in
place, DO NOT over tighten. See Figure
36.
5
Properly reconnect the sensor
and triac(s) to the control
board, making sure the sensor,
triacs, and wire harness connec ons
are connected to the proper control
board terminals. See Figures 34 and 35,
page 23.
With the control board and
triac board(s) moun ng
screws removed, gently pull
the control board with tray away and
down from the assembly. Secure the
control board out of the way.
NOTICE: DO NOT pull or place stress
on any of the wires s ll connected to
the control board.
6
8
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 1
9
Outlet Nipple
Replacement
If you are not comfortable replacing
the outlet nipple yourself, have this
work done by a qualified person. To
replace the outlet nipple, you’ll need
the following tools/supplies:
•
•
•
•
•
Phillips Screwdriver (Magnetic)
Flat Head Screwdriver
Non-Contact Circuit Tester
Needle Nose Pliers
12 inch Adjustable Crescent
Wrench
Bucket (for draining the heater)
Towels
•
•
1
Turn off power to the water
heater.
Drain the water heater and
remove the front cover as
described in “draining the
water heater,” page 18.
2
Triac (1)
Connection
Triac (2)
Connection
Figure 40 - Sensors control board terminal
locations.
Unplug all the sensors and
the triac(s) connectors from
the control board. Use a
cable e or other method to secure
the wires out of the way of the control
board and chambers, to avoid possible
damage. See Figure 41.
NOTICE: If the unit is a two or four
chamber unit, use masking tape to
label the chamber thermistor wires
and their corresponding control board
terminal.
4
Locate the four moun ng
screws securing the heatsink/inlet tube moun ng
brackets. Use a Phillips screwdriver to
remove the four screws and place the
brackets to the side. The assembly can
now move freely. See Figure 43.
NOTICE Secure the heat-sinks in place
for the next step by reinstalling the
two le side bracket screws. DO NOT
ghten screws.
7
Heat Sink/Inlet Tube
Mounting Bracket Screws
TOP VIEW
TH3
TH1
TH2
TH4
TH1
TH2
TH3
TH4
Figure 41 - Thermistor wire configuration.
Locate and remove all the
mounting screws (7 total)
with a Phillips screwdriver.
See Figure 42. IMPORTANT: In
accordance with UL 499, DO NOT
remove the lower moun ng bracket
screw securing the ground wire.
5
FRONT VIEW
Chamber Mounting
Control Board
Bracket Screws
Mounting Tray
Screws
Figure 43 - Heat-sink/inlet tube mounting
bracket screws.
Remove the nipple retaining
plate by gently pulling the top
of the assembly un l the
nipple retaining plate has cleared the
back plate. Remove the nipple
retainer plate and place it out of the
way. See Figure 44.
8
SIDE VIEW
Triac Board(s)
Mounting Screw
Nipple
Retainer Plate
WARNING! Miswiring the control
board upon reinstallation can result
in water hotter than the thermostat
setting, increasing the risk of scalding, severe burns, serious injury and
death.
Back Plate
Figure 44 - Nipple retainer plate removal.
Figure 42 - Mounting screw locations.
Electric Tankless Water Heater
•
25
SERVICE/REPAIR
With the front cover removed, take a moment to
record or photograph how
the sensors and triac(s) are installed
and which control board terminals the
wire harnesses are plugged into. See
Figure 40.
3
TH1 TH2 TH3 TH4
Flow
Sensor
TH-Out
Removing The Outlet Nipple
Locate and remove the screw
and washer securing the
outlet thermistor bracket to
the outlet nipple. Remove the outlet
bracket. Gently pull out the outlet
thermistor with O-ring from the outlet
nipple. See Figure 45.
NOTICE: Pull the outlet thermistor
out by grabbing the metal body of the
thermistor and not the wire.
1
Outlet Nipple
Outlet Nipple
Outlet
Nipple O-ring
Chambers
Outlet
Thermistor
Outlet
Washer
Outlet
Thermistor
Thermistor
Chamber
Chamber
Manifold
Manifold
Using a flat head screwdriver
and/or needle nose pliers,
locate and remove the
retainer pin securing the outlet nipple
to the chamber manifold. See Figure
45.
2
With the outlet nipple
retainer pin removed, gently
pull the outlet nipple out
from the chamber manifold.
3
SERVICE/REPAIR
Installing The New Outlet
Nipple
Before installing the new
outlet nipple, make sure the
O-ring is lubricated and
properly installed.
1
Install the outlet nipple into
the chamber manifold and
secure the outlet nipple to the
chamber manifold with the retainer
pin, previously removed. Insure the
retainer pin is fully seated against the
•
3
4
Figure 45 - Disassembling and removing the
outlet nipple
26
Reinstall the outlet thermistor
with O-ring. Secure the
thermistor in place with the
outlet thermistor bracket. Insert the
washer onto the screw and hand
tighten the screw into place. DO NOT
over tighten. See Figure 45.
Outlet
Thermistor
Bracket
Outlet Nipple
Retainer Pin
2
body of the outlet nipple. The outlet
nipple can be rotated after the retainer
pin has been installed for proper alignment. See Figure 45.
Reinstall the nipple inlet plate
and position/seat the assembly
into place. See Figure 44, page
Control Board
Replacement
If you are not comfortable replacing
the control board yourself, have this
work done by a qualified person. To
replace the control board, you’ll need
the following tools/supplies:
•
•
•
Phillips Screwdriver (Magnetic)
Flat Head Screwdriver
Non-Contact Circuit Tester
Turn off power to the water
heater.
1
25.
Secure the inlet in place with
the heat-sink/inlet tube
brackets. Hand tighten the
Phillips screws in place, DO NOT over
tighten. See Figure 43, page 25.
5
Secure the chamber in place
by reinstalling the three
chamber mounting bracket
screws. Hand tighten the Phillips screws
in place, DO NOT over tighten. See
Figure 42, page 25.
6
Using a crescent wrench,
reconnect the water lines to
the inlet and outlet nipples.
DO NOT over tighten.
7
Reinstall the control board
assembly into place. Reusing
the screws previously
removed, secure the control board
into place. Hand ghten the screws in
place, DO NOT over ghten. See Figure
42, page 25.
8
Properly reconnect the sensor
and triac(s) to the control
board, making sure the
sensor, triacs, and wire harness
connec ons are connected to the
proper control board terminals. See
Figures 40 and 41, page 25.
Remove the front cover as
described in “draining the
water heater,” page 18.
NOTICE: There is no need to drain the
water heater, only remove the front
cover.
2
With the front cover removed, take a moment to
record or photograph how
the control board is installed and
where each components wire
connec on is located. See Figure 46.
3
WARNING! Miswiring the control
board upon reinstallation can result
in water hotter than the thermostat
setting, increasing the risk of scalding, severe burns, serious injury and
death.
Outlet
Thermistor
Front View
Side View
Chamber
Thermistor(s)
9
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 18.
Electric Tankless Water Heater
10
Flow Sensor
Triac
Figure 46 - Control Board Component Connections
Disconnect the chamber
thermistor(s), outlet thermistor, and flow sensor from the
control board. If jumper is present on
the temperature mode, remove and
place on new control board for the
correct mode. See Figure 47.
NOTICE: The number of chamber
thermistors will depend on the number of chambers.
4
Front View
Outlet
Thermistor
Left Side View
Installing The New Control
Board
Right Side View
Display
Cover Clips
With the new control board in
hand, adhere the hardwired
leak detec on sensor in the
designated loca on. See Figure 51.
1
Install the ground wire to the
heat-sink bracket, reusing the
larger screw removed in step
7. See Figure 50.
2
Figure 49 - Display Cover Mounting Tabs.
Chamber
Thermistor(s)
TEMPERATURE
MODE JUMPER
Not Used
Lavatory
(140 F)
Eye Wash
(85 F)
Flow
Sensor
Using a Phillips screwdriver
locate and remove the two
screws securing the control
board to the moun ng tray and the
screw securing the ground wire to the
top heat sink. See Figure 50.
7
Jumper
Ground
Screw
Control Board
Mounting Screws
Figure 47 - Thermistors, flow sensor, and
jumper.
Disconnect the triac
connec ons from the
control board and the
secondary pin connec on from the
lower triac. See Figure 48.
NOTICE: 2 chamber units only have
one triac.
Triac
Connection
Properly reconnect the
thermistor and flow sensor
wire harnesses to the new
control board. Make sure the flow
sensor and thermistor wire harness connections are connected to the proper
control board terminal. See Step 3,
Figures 46 and 47.
6
Figure 50 - Ground Wire & Control Board
Mounting Screws.
Locate and gently remove the
leak detec on sensor, using a
flathead screwdriver. Clean
the area with rubbing alcohol to
remove any remaining adhesive. See
Figure 51.
8
7
Reinstall the front cover,
reusing the four screws
previously removed.
The water heater is now ready
for normal opera on. Turn
the electric power on at the
circuit breaker panel, or fuse box to
energize the water heater. Once
complete, proceed to the Operations
section of the owner’s manual.
NOTICE: If the system diagnostic
yields any codes, ensure all wires are
properly connected before referencing the diagnostic codes section in the
manual.
8
Figure 48 - Triac(s) and secondary pin
connection.
Leak
Detection
Sensor
Figure 51 - Leak Detection Sensor Location.
Electric Tankless Water Heater
•
27
SERVICE/REPAIR
With all the components
disconnected from the
control board, remove the
display cover by pressing in the two
side tabs on the le and right, and
gently pull away from the control
board. See Figure 50.
Reinstall the display cover.
See Figure 49
Reconnect the triac harnesses to the control board and
the secondary pin connection. See Figure 48.
Secondary Pin
Connection
6
4
5
5
Side View
Install the new control board
in the moun ng tray and
secure it into place with the
two smaller screws removed in step 7.
See Figure 50.
3
WIRING DIAGRAMS
The wiring diagrams for the various
models are listed in this sec on.
Locate the correct wiring diagram that
corresponds with your model. The
correct wiring diagram for your model
can be found on the inside of your
water heater’s cover.
The wiring diagrams are listed as follows:
• 2 Chamber, 2 Element,
120/208/240/277 VAC (see below)
•
4 Chamber, 4 Element,
208/240/277 VAC, p. 29.
See also “Electrical Requirements,”
page 7.
TH
CH4
FLOW
SENSOR
BLK TH
OUT
NOTICE: Elements must be kept in this
ŽƌŝĞŶƚĂƟŽŶĨŽƌǁŝƌŝŶŐƉƵƌƉŽƐĞƐ͘
RED
YLW
BLK
BLU
BLU
BLK
YLW
RED
BRN
LED DISPLAY
HEAT
CTRL 2
FLOW
SENSOR
WIRE
BLK
RED
GRN
GRN
GRN
HEAT
SINK 1
GRN
HEAT
SINK 2
GRN
LOWER
BRACKET
WIRING DIAGRAMS
GRN
Input
L2 L1
Output
HARNESS
HEAT
CTRL 1
MOISTURE
SENSOR
Element 1
RED
•
Electric Tankless Water Heater
J2
J1
J2
J1
BLK
RED
BLK
RED
L2/N
BLK
L1
GRN
GND
OPERATING FREQUENCY RANGE: 50-60 Hz
USE ONLY COPPER CONDUCTORS WHEN
CONNECTING TO ELECTRICAL SERVICE.
28
BLK
Element 1
RED
BLK
Element 2
RED
TH
CH3
RELAY
BOARD 1
TH
CH2
Element 2
RED
BLK
THERM 2
TH
CH1
FRONT
TEMP
MODE
JUMPER
THERM 1
THERM OUT
POU 2 CHAMBER, 2 ELEMENT WIRING DIAGRAM
POU 4 CHAMBER, 4 ELEMENT WIRING DIAGRAM
THERM 1
THERM 2
THERM 3
THERM 4
TH
CH1
TH
CH2
TH
CH3
TH
CH4
Element 4
Element 3
Element 1
RED
BLK
RED
Element 2
Output
RELAY
BOARD 2
BLK
RED
BLK
BLK
RED
BLK
RED Element 1
WIRE
J2
J1
J2
J1
BLK
HARNESS
Input
L2 L1
WIRE
RED
BLK
RED
BLK
GRN
GRN
HEAT
SINK 1
GRN
HEAT
SINK 2
LOWER
BRACKET
GRN
WIRING DIAGRAMS
GRN
Output
Input
L2 L1
BLK
RED
D
BL
K
GRN
J2
J1
J2
J1
RE
BLK
RED
RELAY
BOARD 1
BLK
RED
HARNESS
HEAT
CTRL 1
HEAT
CTRL 2
LED DISPLAY
Element 4
RED
YLW
BLK
RED
YLW
BLK
BLU
BLU
RED
BRN
Element 3
FLOW
SENSOR
FLOW
SENSOR
BLK TH
OUT
MOISTURE
SENSOR
Element 2
EKd/͗ůĞŵĞŶƚƐŵƵƐƚďĞŬĞƉƚŝŶƚŚŝƐŽƌŝĞŶƚĂƟŽŶ
for wiring purposes.
TEMP
MODE
JUMPER
THERM OUT
FRONT
RED
L2/N
BLK
GRN
L1
GND
OPERATING FREQUENCY RANGE: 50-60 Hz
USE ONLY COPPER CONDUCTOR WHEN
CONNECTING TO ELECTRICAL SERVICE.
Electric Tankless Water Heater
•
29
APPENDIX
TOP VIEW
TH3
TH1
TH2
TH4
* Often referred to as a temperature sensor.
OUTLET
TH1
TH2
TH3
TH4
INLET
Outlet Thermistor *
F
C
TH1 TH2 TH3 TH4
ENTER
Chamber Thermistor *
THERMISTOR * CONNECTIONS
Control Board
APPENDIX
TH-OUT Outlet Thermistor
TH-1
Chamber 1 Thermistor
TH-2
Chamber 2 Thermistor
TH-3
Chamber 3 Thermistor
TH-4
Chamber 4 Thermistor
ELEMENTS
30
•
Electric Tankless Water Heater
TH-Out
Thermistor
Connections
POU Mounting
Instructions
As stated on page 8, the point-of-use
(POU) models MUST be mounted in the
orienta on as illustrated in Figures 2 and
3. To ensure the leak detec on sensor
func ons properly and effec vely, it is
crucial the leak detec on sensor NOT be
removed from the leak detec on sensor
shelf. See Figure 1, page 5.
dŚĞƉŽŝŶƚͲŽĨͲƵƐŵŽĚĞůƐŵƵƐƚďĞŽƌŝĞŶƚĞĚǁŝƚŚƚŚĞŝŶůĞƚĂŶĚŽƵƚůĞƚ
ĨĂĐŝŶŐƵƉǁĂƌĚ͘
Visual
džĂŵƉůĞ͗
Use the moun ng template on the next
page.
NOTICE: Read “Minimum Clearances”
(Figure 2, page 8) before you start.
APPENDIX
NOTICE:
• Point-of-use models must have ƚŚĞůĞĂŬĚĞƚĞĐƟŽŶƐĞŶƐŽƌŵŽƵŶƚĞĚ
ŽŶƚŚĞůĞĂŬĚĞƚĞĐƟŽŶƐĞŶƐŽƌƐŚĞůĨ͘^ĞĞŝůůƵƐƚƌĂƟŽŶŽŶƉĂŐĞϱ͘
Electric Tankless Water Heater
•
31
6.00”
(REF)
APPENDIX
9.50”
(REF)
Point-of-use Models
Mounting Template
32
•
Electric Tankless Water Heater
APPENDIX
A.O. Smith Corporation. All Rights Reserved.
Limited Warranty provided by Manufacturer.