State RPVS-24K, RPVS-30K, RPVS-35K, RPVS-35E, RPVS-40X, RPVS-45E, RPVS-55E, RPVS-70E, RPVS-78X, RPVS-80E, RPVS-90E, RPVS-120E, R2VA-140E, R2VA-140X, R2VA-160E, R4LA-180E, R4LA-220E, R4LA-240E, R4LA-280E, R4LA-280X, R4MA-320E Instruction Manual

InstallaƟon InstrucƟons and
Use & Care Guide
Printed on: 2/1/2024 10:35:01 AM CT
Electric Tankless
Water Heater
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have diĸculty following the direcƟons, or
aren’t sure you can safely and properly do any of this work yourself,
call the Technical Support Hotline which is listed on your warranty.
We can help you with installation, operations, troubleshooting, or maintenance.
Before you call, write down the model and serial number from the water heater’s
data plate.
°F
°C
ENTER
Incorrect installaƟon, operaƟon, or service can damage the water heater, your house
and other property, and present risks including Įre, scalding, electric shock, and
explosion, causing serious injury or death.
°F
°C
ENTER
Table of Contents ..............................Page
IMPORTANT SAFETY INFORMATION ............................. 2
GENERAL INFORMATION ............................................... 5
INSTALLATION ............................................................... 11
OPERATION ................................................................... 15
TROUBLESHOOTING .................................................... 17
SERVICE ......................................................................... 22
WIRING DIAGRAMS ..................................................... 29
APPENDIX ...................................................................... 34
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.
09/21
100306523_2000558983 (REV. D)
SAFETY
IMPORTANT SAFETY INFORMATION
Read and follow all safety messages and instrucƟons in
this manual.
This is the safety alert symbol. It is used to alert you to
potenƟal 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 instrucƟons, 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 informaƟon to keep...
Fill out this secƟon and keep this
manual for reference.
Date Purchased:
Model number:
Printed on: 2/1/2024 10:35:01 AM CT
Serial number:
DANGER
DANGER indicates hazardous
situaƟon that, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous
situaƟon that, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a hazardous
situaƟon that, if not avoided, could
result in minor or moderate injury.
NOTICE
2
•
NOTICE indicates pracƟces 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 precauƟons below,
all labels on the water heater, and
the safety messages and instrucƟons
throughout this manual.
• Be sure the cover is reinstalled and
secured after servicing to reduce
the risk of fire and electric shock.
Temperature Time to Produce a
Serious Burn
120°F (49°C)
More than 5 minutes
RISKS DURING OPERATION
125°F (52°C)
1½ to 2 minutes
130°F (54°C)
About 30 seconds
135°F (57°C)
About 10 seconds
140°F (60°C)
Less than 5 seconds
145°F (63°C)
Less than 3 seconds
150°F (66°C)
About 1½ seconds
155°F (68°C)
About 1 second
WARNING
General Requirements
Printed on: 2/1/2024 10:35:01 AM CT
•
•
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 or
CSA standard C22.1 Canadian
Electrical Code, Part 1 in Canada.
Follow all applicable plumbing,
heating, and air conditioning
codes during installation.
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.
RISKS DURING INSTALLATION
AND MAINTENANCE
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 DEͳENERGIZE THE
EQUIPMENT. ALL BRANCH CIRͳ
CUITS MUST BE DISCONNECTED
PRIOR TO SERVICE.
• Use a non-contact circuit tester to
confirm that power is off before working on or near any electrical parts.
•
For all models, the temperature
set point is factory set to 120°F
to reduce the risk of scalding.
Exception: single element (pointof-use) models are factory set to
approximately 105°F.
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 15.
Even if you set the water heater set
point to a low seƫng, 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 (user
interface on two- or four-element
models) or other malfunctions may
result in higher than expected water
temperatures.
To reduce the risk of unusually hot water reaching the Įxtures in the house,
install ThermostaƟc Mixing Valves at
each point of use.
If anyone in your home is at parƟcular
risk of scalding (for example, the elderly, children, or people with disabiliƟes) or if there is a local code or state
law requiring a certain water temperature at the hot water tap, then these
Electric Tankless Water Heater
•
3
SAFETY
Printed on: 2/1/2024 10:35:01 AM CT
precauƟons are parƟcularly important.
According to a naƟonal 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 ThermostaƟc Mixing
Valves installed at each point of use
allow you to set the water heater’s
set point to a higher seƫng without
increasing the risk of scalds. A higher
temperature can help provide proper
water temperatures for appliances such
as dishwashers and washing machines.
WARNING
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 13. Use a UL listed or CSA
approved strain relief. Connect the
ground wire to the ground lug. (The
ground lug is identified by a green
and white ground label 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.
• 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
4
•
Electric Tankless Water Heater
GENERAL INFORMATION
Introduction
Printed on: 2/1/2024 10:35:01 AM CT
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.
Temperature and Pressure
Relief Valve
•
Two- or four-element models:
page 19.
WARNING! Do not cap or plug the
T&P relief valve or discharge pipe.
If you install a T&P valve, turn on the
water supply to ensure that no water
drips from it. Next, operate the valve
Component Identification: Point-of-Use Models (RPV, CPV)
OUTLET
INLET
Heating Element
(Behind inlet/outlet)
Thermistor* Connections
T-Aux
Auxiliary thermistor
T-In
Inlet thermistor
T-Out
Outlet thermistor
Outlet Thermistor *
(Connects to T-Out)
Auxiliary Thermistor *
(Connects to T-Aux)
Inlet Thermistor *
(Connects to T-In)
T-Aux
Your water heater also includes
on-board self diagnostics. If the
system produces an error code, see
“Troubleshooting” on one of the
following pages:
Point-of-use models: page 17.
NOTICE: If a temperature and
pressure relief valve is installed, it
must be piped by minimum 1 inch
pipe to a suitable drain capable of
discharging 10 GPM. A splash cover
must be included to protect the
area of attachment to the wall. The
manufacturer will not be responsible
for any water damage that may occur.
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.
A built-in alarm is included. If water
leaks inside your electric water
heater, an alarm will sound to provide
warning. Simply turn off power to the
water heater at the circuit breakers,
turn off the water supply, then correct
the leak.
•
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.
T-In
T-Out
TERMINAL
BLOCK
L2/N
L1
*
GND
POWER
SUPPLY
Often referred to
as a temperature
sensor.
Continued on the next page...
Electric Tankless Water Heater
•
5
GENERAL INFO
•
Component
Descriptions
Component IdenƟĮcaƟŽŶ͗Two-Element Models (R2V, C2V)
GENERAL INFO
OUTLET
INLET
HEATING ELEMENTS
NOTICE͗
The user interface is
described in Figure 7,
page 16.
Intermediate
Thermistor *
(connects to
TH-1)
TH-1
TH-2
TH-IN
Printed on: 2/1/2024 10:35:01 AM CT
Thermistor* Connections
TH-IN
Inlet thermistor
TH-1
Intermediate thermistor
TH-2
Outlet thermistor
Second “L1” and “L2”
to be used for 14 kW
208 V, and 16 kW and
18 kW 240 V models
with 2-circuits.
L1
L2
L1
L2
Access Plate
(for draining)
Outlet Thermistor *
(connects to TH-2)
Inlet Thermistor *
(connects to TH-IN)
* Often referred
to as a
temperature
sensor.
Component Identification: Four-Element Models (R4L, C4L, R4M, C4M)
Intermediate
Thermistor *
(connects to
TH-2)
OUTLET
Element
Element
Intermediate
Thermistor *
(connects to
TH-1)
Element
Element
INLET
NOTICE:
The user interface is
described in Figure 7,
page 16.
TH-1
TH-2
TH-3
TH-4
TH-IN
Thermistor* Connections
TH-IN
Inlet thermistor.
TH-1
Intermediate thermistor
TH-2
Intermediate thermistor
TH-3
Intermediate thermistor
TH-4
Outlet thermistor
L1
L2
L1
L2
* Often referred to as a
temperature sensor.
Outlet Thermistor *
May be located on
outlet elbow.
(connects to TH-4)
6
•
Electric Tankless Water Heater
Access Plates
(for draining)
Intermediate Thermistor *
(connects to TH-3)
Inlet Thermistor *
(connects to TH-IN)
General Specifications
Wiring & Circuit Breaker
Requirements
Water Connections
Weight
lbs. (kg)
Water Heater
Dimensions*
Printed on: 2/1/2024 10:35:01 AM CT
*
Point-of-Use:
RPV, CPV
Two Element:
R2V, C2V
GENERAL INFO
Models
Four Element:
R4L, C4L, R4M, C4M
See “Electrical Requirements” on page 8.
3/4” NPT
3/4” NPT
3/4” NPT
8 lbs. (3.6 kg)
13 lbs. (5.9 kg)
20 lbs. (9 kg)
H 16-5/8” x W 6-1/2” x D 7-3/16” H 17-3/4” x W 11-1/2” x D 6-1/8”
H 18-1/8” x W 17” x D 6-1/8”
(H 42.2cm x W 16.5cm x D 18.3 cm) (H 45.1 cm x W 29.2 cm x D 15.6 cm) (H 46 cm x W 43.2 cm x D 15.6 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 maximum working pressure is 150 psi. 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.
Electric Tankless Water Heater
•
7
GENERAL INFO
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 that model number in one of the tables listed below.
For example, if your model is RPVA-24-K, find *P**-24-K in the appropriate table.
Models within each table are sorted by Voltage first, then by Wattage per Element (KW).
•
Printed on: 2/1/2024 10:35:01 AM CT
•
Follow the requirements listed for your model.
ප
Point-of-use models are listed below.
ප
Two-element models: page 9.
ප
Four-element models: page 10.
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
Recommended
Breaker Size
Voltage
(Amps)
*
Number
Wattage
Current per
of
per Element
Breaker
Elements
(KW)
(Amps)
Recommended
Wire Size*
(AWG)
Element Type
*P**-24-K
20
120
1
2.4
20.00
12
Single
*P**-30-K
25
120
1
3
25.00
10
Single
*P**-35-K
30
120
1
3.5
29.17
10
Single
*P**-40-X
20
208
1
4
19.23
12
Single
*P**-78-X
40
208
1
7.8
37.5
8
Single
*P**-35-E
15
240 ‡
1
3.5
14.58
14
Single
*P**-45-E
20
240 ‡
1
4.5
18.75
12
Single
*P**-55-E
25
240 ‡
1
5.5
22.92
10
Single
*P**-70-E
30
240 ‡
1
7
29.17
10
Single
*P**-80-E
40
240 ‡
1
8
33.33
8
Single
*P**-90-E
40
240 ‡
1
9
37.50
8
Single
*P**-120-E
50
240 ‡
1
12
50
6†
Dual
*P**-30-Y
15
277
1
3
10.83
14
Single
†
‡
All wiring/conductors must be rated for 90°C or greater.
Maximum recommended wire size is #6 cu AWG.
This model may used with a 208 VAC supply. Use of 208 VAC may require different breaker and/or wire sizes.
Follow all code requirements.
8
•
Electric Tankless Water Heater
Point-of-Use Models
GENERAL INFO
(For potable water heating only. Not for space heating.)
NOTICE: Models sorted by Voltage, then by Wattage per Element.
Model
Recommended
Breaker Size
Voltage
(Amps)
Printed on: 2/1/2024 10:35:01 AM CT
*
†
‡
Number
Wattage
Current per
of
per Element
Breaker
Elements
(KW)
(Amps)
Recommended
Wire Size*
(AWG)
Element Type
*P**-40-Y
15
277
1
4
14.44
14
Single
*P**-60-Y
25
277
1
6
21.66
10
Single
*P**-73-Y
30
277
1
7.3
26.35
10
Single
*P**-90-Y
40
277
1
9
32.49
8
Single
All wiring/conductors must be rated for 90°C or greater.
Maximum recommended wire size is #6 cu AWG.
This model may used with a 208 VAC supply. Use of 208 VAC may require different breaker and/or wire sizes.
Follow all code requirements.
Two-Element Models
(For potable water heating only. Not for space heating.)
NOTICE: Models sorted by Voltage, then by Wattage per Element.
Model
Recommended
Breaker Size
Voltage
Number of
Elements
Wattage per
Element (KW)
(Amps)
Current per
Breaker
(Amps)
Recommended
Wire Size*
Element
Type
(AWG)
*2**-140-X
40 amps each
(2 circuits)
208
2
7
33.65
8
Single
*2**-120-E
60 amps
240
2
6.1
50.83
6†
Single
*2**-140-E
60 amps
240
2
7
58.34
6†
Single
*2**-160-E
40 amps each
(2 circuits)
240
2
8
33.33
8
Single
*2**-180-E
40 amps each
(2 circuits)
240
2
9
37.5
8
Single
* All wiring/conductors must be rated for 90°C or greater.
† Maximum recommended wire size is #6 cu AWG.
Electric Tankless Water Heater
•
9
GENERAL INFO
Four-Element Models (Single Phase)
For potable water heating only. Not for space heating.
NOTICE: Models sorted by Voltage, then by Wattage per Element.
Model
Recommended
Breaker Size
Voltage
Number of
Elements
Wattage per
Element (KW)
Printed on: 2/1/2024 10:35:01 AM CT
(Amps)
Current per
Breaker
(Amps)
Recommended
Wire Size*
(AWG)
*4**-280-X
70 amps each
(2 cirucits)
208
4
7
67.31
6†
Single
*4**-180-E
40 amps each
(2 circuits)
240
4
4.5
37.50
8
Single
*4**-220-E
50 amps each
(2 circuits)
240
4
5.5
45.83
6†
Single
*4**-240-E
60 amps each
(2 circuits)
240
4
6
50.00
6†
Single
*4**-280-E
60 amps each
(2 circuits)
240
4
7
58.33
6†
Single
*4**-320-E
70 amps each
(2 circuits)
240
4
8
66.67
6†
Single
* All wiring/conductors must be rated for 90°C or greater.
† Maximum recommended wire size is #6 cu AWG.
10
Element
Type
•
Electric Tankless Water Heater
INSTALLATION
Getting Started
electrical wires that will enter the
heater from the side.
Clearances
Bottom Clearance: At a minimum,
maintain a bottom clearance of 8
inches (20.3 cm) for single element
models or 15 inches (38.1 cm) for 2- or
4-element models. Do not store any
items underneath the water heater.
See Figure 1 or Figure 2.
Top Clearance: A minimum of 12
inches (30.5 cm) is required for
removal and maintenance of heating
elements and to provide access for
plumbing connections.
Printed on: 2/1/2024 10:35:01 AM CT
Figure 1.
Side View
12”
(30.5 cm)
Front Clearance:
15” + (38.1 cm +)
2-Element or
4-Element
Water Heater
Front
View
Wall or
adjacent
object
•
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 or
CSA standard C22.1 Canadian
Electrical Code, Part 1 in Canada.
•
Follow all other applicable
plumbing, heating, and air
conditioning codes during
installation.
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
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).
8”
(20.3 cm)
8”
(20.3 cm)
°F
°C
ENTER
15”+
(38.1 cm +)
Install one
stĂŶĚŽīďƵŵƉĞƌat
each corner.
(4 totĂů͖Ɖrovided.)
Minimum Clearances
•
Figure 2.
Wall
Side View
12”
(30.5 cm)
8”
(20.3 cm)
Front Clearance:
15” + (38.1 cm +)
Single
Element
Water Heater
Front
View
8”
(20.3 cm)
NOTICE: Point-of-use models may be mounted
8”+
horizontally. See Figure 3, page 12.
(20.3 cm +)
Maintain 12” (30.5 cm) MIN. clearance at
inlet/outlet.)
Minimum Clearances
Choose a
Location
Wall or
adjacent
object
•
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
Electric Tankless Water Heater
•
11
INSTALLATION
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 1 or Figure 2.
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
Wall
Code Compliance
•
Do not install your water heater
underneath condensate lines.
•
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.
INSTALLATION
Printed on: 2/1/2024 10:35:01 AM CT
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
“Clearances” on page 11.
Mount Your
Water Heater
2
1.
2.
marker. You will then be able to
align the marks later. See also
Figure 5, page 14.
5.
6.
3.
Remove the screws that secure
the protective cover.
4.
Remove the cover. If your water
heater has a user interface display
(UIM) , unplug its ribbon cable
from the control board in the
water heater. (A UIM is shown in
Figure 7, page 16.)
8.
Position the unit against the wall.
Make sure that the unit is level.
NOTICE: Two-element and
four-element models must be
oriented with the inlet and
outlet facing upward. However,
point-of-use (POU) models may
be oriented horizontally as
described in Figure 3. To mount
a POU water heater horizontally,
follow the instructions on page
34.
9.
NOTICE: Be sure to remember
where to plug it back in later.
When the Ɵme comes to plug the
connector back into the control
board, it must be oriented correctly. We recommend marking
the connector and board with a
12
•
Electric Tankless Water Heater
sĞƌƟĐĂů
Two- or four-element water
heaters only:
Apply one standoī bumper to
each corner on the back of the
water heater. Standoīs are
provided. These standoīs must
be installed so the water heater
can vent properly. See Figure 1,
page 11.
Determine the mounting location
on the wall, then verify your
clearances. (See “Clearances” on
page 11.)
Stand the unit upright and
remove the plastic wrap.
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water heater:
If you have a point-of-use model,
locate the four mounting holes
in the back plate. (If you have
a two- or four-element model,
there are two mounting tabs on
each side of your water heater.)
7.
Unpack the heater from the
shipping carton, but do not cut
the shipping carton with a sharp
instrument.
Figure 3.
Secure the water heater to the
wall or other suitable structure
with screws, bolts, or anchors
as appropriate. Ensure that the
mounting surface and fasteners
will support the weight of the
water heater. (You will reinstall
the water heater’s protective
cover later.)
Horizontal
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Connect the
Water Lines
3
NOTICE:
•
DO NOT apply heat to the water
lines, nipples, or any fitting on the
water heater. Heat from soldering
may damage the heat exchanger.
•
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.
•
Use two wrenches when attaching
the hot and cold water lines to
•
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 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.
•
The warranty will not cover
damage caused by water quality.
•
Recommended operating
pressure: 50 to 60 psi. Higher
pressures require a pressure
reducing valve.
6.
Installations above the ceiling or in
an attic require a bleed air separator.
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.
•
•
A properly-sized arrestor should
be installed where water hammer
exists.
NOTICE: Do not supply electrical
power to your water heater yet. If you
Figure 4.
NOTICE: Failure to purge air from
the water lines can leave air pockets,
causing damage to the heating
elements when power is applied.
4
Hot
Cold
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 must 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 installaƟon
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 in the USA or CSA
standard C22.1 Canadian Electrical
Code, Part 1 in Canada.
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.
Install Electrical
Service
WARNING
Failure to observe these warnings
could lead to an improper
installation, and the risks include fire,
electrical shock, and/or death:
•
Installation must be performed
by a qualified installer. The
installer (licensed professional)
is responsible for the correct
installation of the water heater
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 raƟng
plate and ensure that the electrical
service’s voltage, wiring size
Electric Tankless Water Heater
•
13
INSTALLATION
Printed on: 2/1/2024 10:35:01 AM CT
the heater. The second wrench
must be used to hold the heater’s
fittings securely because they are
designed to turn freely.
(ampacity) and circuit breaker
raƟng/type are correct for this
water heater.
model. (See “Wiring Diagrams” on
page 29.)
If you marked the board and connector during earlier steps, align
the marks when plugging the connector in.
NOTICE: The electrical
requirements for your model are
listed in “Electrical Requirements”
which starts on page 8.
INSTALLATION
Printed on: 2/1/2024 10:35:01 AM CT
4.
1.
Connect the electrical service
as described in “Electrical
Requirements” (starting on page
8).
Do the following:
B.) Disconnect the plug.
ප
C.) Rotate the plug 180 degrees,
then plug it back in.
ප
ප
6.
7.
14
A.) Disconnect power at all
branch circuits.
Check all electrical
connections to make sure that
they are correct and secure.
Make sure that the
supply voltage, wiring
size (ampacity), circuit
breaker rating and type are
correct. (Refer to “Electrical
Requirements” which starts
on page 8).
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.
8.
WARNING! Be sure the cover is
secured to reduce the risk of Įre
and electric shock.
9.
Turn on power to the water heater.
10. Verify proper operation.
2.
At nearby hot water faucets, turn
water on medium-low.
ප
You should hear a “click” as
the heater’s relays engage.
ප
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 diagnosƟcs. If water heater powers
up but does not heat water, shut oī
power to the unit. Reverse the top pair
of L1 and L2 leads on the terminal strip.
Apply power and check again. See
“TroubleshooƟng” for more informaƟon (page 17 or 19).
Figure 5.
Two- and four-element models only:
Ribbon Cable
Red Band
Two- and four-element models
only: Plug the connector end
of the cover’s ribbon cable into
the control board. See Figure 5.
(Plug it in where you see two rows
of header pins close together, five
pins in each row.) If necessary,
refer to the “DISPLAY” callout
in the wiring diagram for your
•
Reinstall the water heater’s cover.
Test Water
Heater Operation
5
NOTICE: The plug must be oriented correctly. If you plug it in
backwards, it will not cause damage, but the display will not work.
If the display does not work aŌer
you have completed installaƟon,
follow these steps:
There is a wiring diagram label on
the inside of your water heater’s
protective cover. See also “Wiring
Diagrams” on page 29 of this
manual.
5.
Operating instructions are listed
on page 15.
Electric Tankless Water Heater
“TX” Label
on Board
Ribbon Cable
Connector
Control Board
NOTICE:
When plugging the display
(User Interface Module)
into the control board,
orient it as shown in this
graphic.
OPERATION
Water Temperature
Adjustment
Scalding Risk
This water heater
can make water hot
enough to cause
severe burns instantly, resulting in
severe injury or death. Before
aƩempƟng to adjust the temperature
set point, read “RISKS DURING
OPERATION” on page 3. If the
instrucƟons are not clear, contact a
qualiĮed service technician.
To adjust your temperature seƫng, refer to one of the following procedures.
The water temperature set point can
be adjusted within a range of 90°F
(32C) and 140°F (60 °C).
The factory seƫng is approximately
105°F (+/-1°F).
To change the set temperature,
•
To decrease the set temperature,
turn the knob to the left (counter
clockwise).
•
To increase the set temperature,
turn the knob to the right
(clockwise).
•
1.
Press and release either the
UP or DOWN button (Figure 7,
page 16). The display will
blink and allow you to adjust the
temperature set point.
2.
Press and hold the UP or
DOWN button to scroll through
the temperatures quickly.
Single presses will adjust the
temperature setting one degree
at a time.
3.
Press the ENTER button to
confirm.
Use a small flat blade screwdriver
to turn the knob.
The water temperature set point can
be adjusted within a range of 90°F
(32C) and 140°F (60 °C).
Point -of-use models only:
To adjust the temperature setting,
Figure 6.
Two- or four-element models
only:
OPERATION
Printed on: 2/1/2024 10:35:01 AM CT
WARNING
turn the temperature adjustment
knob as described below. This knob
can be found at the top of the circuit
board next to the plumbing connecƟons. (Figure 6.)
Continued on the next page...
POINT-OF-USE MODELS ONLY:
TEMPERATURE ADJUSTMENT KNOB ON INTERNAL CIRCUIT BOARD
PLUMBING CONNECTIONS
BEHIND CIRCUIT BOARD
TEMPERATURE ADJUSTMENT KNOB
• DECREASE SET TEMPERATURE:
TURN KNOB TOWARD LEFT
(COUNTER-CLOCKWISE )
• INCREASE SET TEMPERATURE:
TURN KNOB TOWARD RIGHT
(CLOCKWISE )
• USE A SMALL FLAT BLADE
SCREWDRIVER.
Electric Tankless Water Heater
•
15
To toggle between Fahrenheit and
Celsius,
Figure 7.
Two and Four Element Models Only:
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.
°F
°C
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ENTER
OPERATION
Printed on: 2/1/2024 10:35:01 AM CT
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16
•
Electric Tankless Water Heater
TROUBLESHOOTING
Error Codes for Point-of-Use Models
If you have a two- or four-element model, see page 19.
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.
•
•
•
The Įrst digit of the error code is Ňashed in RED.
A GREEN Ňash separates the Įrst and second digits.
The second digit of the error code is Ňashed in RED.
See the example below. Components are idenƟĮed in Figure 8, page 18.
Example from the Table Below:
Flash Code Sequence: 3-6 (Freeze Warning). The 3-6 code would be displayed like this:
3
6
3 red Ňashes — green Ňash — 6 red Ňashes
AŌer you idenƟfy the code, locate its descripƟon and soluƟon in the table.
NOTICE:
• There may be mulƟple codes; verify all sequences.
• If there are mulƟple error codes, the LED will pause between each one. The GREEN LED will Ňash twice aŌer the last error
code. The error codes will then repeat.
• If you want to hear the Ňash code, press the mode buƩon for two seconds. This will turn the audible beeper on. See Figure 8,
page 18.
Flash Code
Sequence
Description
Action / Solution
1-1
Disable switch open (hardware
jumper is not installed on the circuit
board).
Install the missing jumper(s) on the circuit board as shown in Figure 8, page 18.
Both jumpers must be in place.
1-2
T-In thermistor is open.
Check wiring. Replace as necessary.
1-3
T-Out thermistor is open.
Check wiring. Replace as necessary.
1-7
Water temperature above 145°F has
been detected. (This code will clear
when the condiƟon is corrected.)
1. Turn oī all power to the water heater. Open a nearby hot water Įxture
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.
2. If the issue persists, the circuit board (control board) may need to be replaced.
Contact Technical Support.
Continued on the next page...
Electric Tankless Water Heater
•
17
TROUBLESHOOTING
Printed on: 2/1/2024 10:35:01 AM CT
The LED on the circuit board will display an error code as a Ňash paƩern. The Ňash paƩern is displayed as follows:
Description
Action / Solution
1-8
Leak detected.
Shut oī all power to the water heater. Check for water leaks. Correct any leaks
found. Dry the leak sensor (Figure 8), then dry the circuit board completely before
restoring power.
2-1
Tank is not full of water.
Ensure that the heater is Įlled with water and that there is no air trapped inside.
Make sure that the back Ňow preventer or check valve is operaƟng properly and is
not blocking the water heater’s water supply. If the heater is Įlled and there are
no leaks, connect level detect spades on the circuit board to ground. If the code
is accompanied by a clicking sound that is present when water is running, check
the elements.
3-4
CriƟcal error (displayed when other
errors are triggered)
Follow the AcƟon/SoluƟon for the other errors that are displayed.
3-6
Freeze Warning (T-In thermistor
detects that incoming water is lower
than 40°F). This error may also
occur when an open thermistor is
detected.
1. Check wiring to the T-In thermistor. Ensure that the T-In thermistor is not faulty.
2. If incoming water is below 40°F, Turn oī power to the water heater, close oī
its water supply, then drain the water heater. Wait unƟl the incoming water is
above 40°F, then restore service.
Figure 8.
OPEN PINS (3)
REQUIRED JUMPERS (2)
LEAK SENSOR
BACK OF CASE
TROUBLESHOOTING
Printed on: 2/1/2024 10:35:01 AM CT
Flash Code
Sequence
TOP OF INTERNAL CIRCUIT BOARD
INTERNAL CIRCUIT BOARD
PLUMBING CONNECTIONS
BEHIND CIRCUIT BOARD
LED STATUS LAMP
18
•
Electric Tankless Water Heater
MODE BUTTON:
(PRESS FOR TWO
SECONDS TO TURN
AUDIBLE BEEPER
ON)
Error Codes for Two and Four Element Models
If you have a point-of-use model, see page 17.
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.
Description
Action / Solution
E02
Hardware determined that the
heated water has exceeded the
temperature limit.
Turn oī power to the water heater. Contact Technical Support.
E03
Low water level in heater.
1.
2.
3.
E04
Moisture/leak detected in heater. Turn oī power and water supply to the water heater.
Contact Technical Support.
E06
SoŌware determined that the
water temperature is too high.
E10
Inlet temperature sensor is open.
E11
Open
thermistor.
E12
Open
thermistor.
Turn off power to the water heater.
Turn on a nearby hot water faucet to flush air out of the water line.
When water runs uninterrupted from the hot water fixture, turn on
power to the water heater.
This error may appear when the unit is powered up. Turn on a hot water
tap to run water through the water heater. The error should clear. If not,
turn oī the power to the water heater. Contact Technical Support.
TROUBLESHOOTING
Printed on: 2/1/2024 10:35:01 AM CT
Display
2- and
4-Element
models:
TH-1 open.
Point-of-use
models:
T-Out open.
2-Element
models:
Outlet
thermistor
open.
1.
2.
3.
4.
5.
Turn oī power to the water heater.
Check the connecƟons of the thermistor in quesƟon.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
Does the error code reoccur? If yes, turn oī power and replace the
thermistor that is listed in the leŌ-hand column. See “Thermistor
(Temperature Sensor) Replacement” on page 25.
4-Element
models:
TH-3 thermistor
open.
E13
4-Element models only:
TH-2 thermistor is open.
Continued on the next page...
Electric Tankless Water Heater
•
19
Display
Description
E14
4-Element models only:
Outlet thermistor open (TH-4).
E20
Inlet thermistor shorted.
E21
Shorted
thermistor.
Turn oī power to the water heater.
Check the connecƟons of the thermistor in quesƟon.
Disconnect the thermistor, then reconnect it.
Turn on power to the water heater.
Does the error code reoccur? If yes, turn oī power and replace the
thermistor that is listed in the leŌ-hand column. See “Thermistor
(Temperature Sensor) Replacement” on page 25.
2- and
4-Element
models:
TH-1 shorted.
Point-of-use
models:
T-Out shorted.
2-Element models:
TH-2 thermistor is shorted.
Replace the temperature sensor that is listed in the leŌ-hand column.
See “Thermistor (Temperature Sensor) Replacement” on page 25.
4-Element models:
TH-3 thermistor is shorted.
E23
4-Element models only:
TH-2 thermistor is shorted.
E24
4-Element models only:
TH-4 thermistor is shorted.
E51
&
E52
CommunicaƟons Failure. The
Turn oī power to the water heater. Contact Technical Support.
user interface has lost connecƟon
with the control board.
TROUBLESHOOTING
Printed on: 2/1/2024 10:35:01 AM CT
E22
Action / Solution
1.
2.
3.
4.
5.
20
•
Electric Tankless Water Heater
General Troubleshooting
The following chart provides an overview of basic troubleshooting.
Symptom
Hot water supply is warm, but it does
not get hot.
Corrective Action
Cold water used causes reverse flow
through water heater.
Install check valve on outlet.
Unit has been in standby for an
extended period with no hot water
use.
NORMAL OPERATION. Unit will
activate as needed to maintain a
reference temperature to ensure
quick start-up on next use.
Temperature set point too low.
Increase the temperature set point.
Flow is too high.*
Reduce flow.
One of the main circuit breakers may
be tripped. (For units with more than
one branch circuit only.)
Check power panel. Reset breaker if
tripped.
Failed heating element or
temperature sensor.
Replace element or sensor
(thermistor).
Flow is too high.*
Reduce flow.
The circuit breaker(s) may be tripped.
Check power panel. Reset breaker if
tripped.
Failed heating element or
temperature sensor.
Replace element or sensor
(thermistor).
Control board failure.
Contact Technical Support.
Flow is too high*
Reduce flow.
One of the main circuit breakers may
be tripped. (For units with more than
one branch circuit only.)
Check power panel. Reset breaker if
tripped.
Failed heating element or
temperature sensor.
Replace element or sensor
(thermistor).
Control not able to read phase.
Reverse the top pair L1 and L2 leads
on the terminal strip.
Hot water supply is cold.
Hot water temperature fluctuates.
No hot water after installation.
TROUBLESHOOTING
Printed on: 2/1/2024 10:35:01 AM CT
Unit “clicks” periodically when no hot
water is being used.
Possible Cause
* If your water heater runs out of hot water too quickly, it may be too small for your needs. Consider replacing it with a
larger model or adding additional heater(s) to meet flow demand. Please refer to the product specification sheet for
proper flow rates based on incoming water temperature.
Electric Tankless Water Heater
•
21
SERVICE
WARNING!
Electric Shock Risk
Servicing should be
performed on this water
heater only after it has been
disconnected from the power supply
circuit(s). Failure to do so can result in
severe injury or death from electrical
shock:
• Disconnect power by opening the
circuit breaker or removing the
fuses before installing or servicing.
Printed on: 2/1/2024 10:35:01 AM CT
• Some models are connected to
more than one branch circuit, and
more than one disconnect switch
may be required to de-energize the
equipment.
Element Removal and
Replacement
•
1
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 oī. When you are Įnished,
be sure all covers are secured to
reduce the risk of Įre and electric
shock.
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.
Figure 10: Heating elements
• All branch circuits must be
disconnected prior to service.
• Use a non-contact circuit tester to
confirm that power is off before
working on or near any electrical
parts.
SERVICE
• Replace the water heater’s cover
after servicing to reduce the risk of
fire and electric shock.
NOTICE:
A built-in alarm is also included. If
water leaks inside your electric water
heater, an alarm will sound to provide
warning. Simply turn off power to the
water heater at the circuit breakers,
turn off the water supply, then correct
the leak.
Figure 9: Non-Contact circuit tester
If you are not comfortable replacing
a heaƟng element yourself, have this
work done by a qualiĮed person. To replace the heaƟng element, you’ll need
the following tools and supplies:
•
Phillips head screwdriver
•
Adjustable wrench (for point-ofuse models)
•
Pipe wrench or slip joint pliers (for
point-of-use models only)
•
1-1/2 inch element wrench or
adjustable wrench (for element
removal; two- and four-element
models)
•
Bucket
•
Rag
•
Hair dryer or compressed air
Figure 11: Installed heating
element
2
ConĮrm that power is oī by
checking the wires with a
non-contact circuit tester.
3
Open a nearby hot water
faucet and run the water until
it is cool.
WARNING! To reduce the
risk of scalding, be sure the
water runs cool before you
proceed.
4
Close the inlet valve to the
water heater, but leave the
hot water faucet open to
relieve pressure.
ConƟnued...
22
•
Electric Tankless Water Heater
5
Remove the heater’s front
cover, then place a bucket
under the water heater to
catch any water that spills.
NOTICE: If you have a two- or
four-element model, you must
unplug the cover’s ribbon
cable from the control board.
When you plug it back in later,
it must be oriented correctly.
(See Figure 5, page 14.)
We recommend marking the
connector and board with a
marker. You will then be able
to align the marks.
Printed on: 2/1/2024 10:35:01 AM CT
•
If you have a point-of-use water
heater, go to step 6.
•
If you have a two- or four-element
water heater, go to step 7 on page
24.
6
Point-of-use water heaters
only:
6.1 Remove the heater’s top plate:
A.) Remove both screws which secure
the top plate to the water heater.
(See Figure 12.)
B.) Lift and remove the top plate.
Figure 13.
Point-of-use models:
Grommet OrientaƟon
Outlet
Inlet
Grommets
NOTICE: During the next step,
protect the circuit board from
dripping water!
A.) Slide the inlet and outlet
grommets upward to provide
clearance. (Figure 13).
E.) Lift the element out of the water
heater. NOTICE: As you lift the
element out of the opening, wrap
it with a rag to keep water from
dripping onto the circuit board.
B.) Remove the screws that secure
the red and black wires to the top
of the heating element. (Use the
Phillips screwdriver. Save both
screws for later use.)
F.) Remove the brass ground ring
from the top of the element. (See
Figure 15: Brass ring and flag
terminal.) Set it aside for later
use.
6.3. Remove the old element:
C.) Disconnect the green ground wire
from the heating element. (See
Figure 14.) It is secured with a
spade connector. Pull it straight
up from the element to slide it off
the terminal.
Figure 15: Brass ring and flag terminal
Flag terminal
Figure 14.
Element in point-of-use heater
Figure 12.
Brass ground ring
(point-of-use models)
Top View of Point-of-Use Model
Top Plate
D.) Unscrew and remove the
retaining nut that secures the
heating element (See Figure 14).
Use an adjustable wrench. You
may also purchase an element
replacement kit which includes a
thin-walled socket. Call Technical
Support for ordering information.
Screws
A.) Insert the new element into its
water heater opening.
Retaining Nut
B.) Place the brass ground ring on top
of the element. Make sure that the
flag terminal is positioned so that
the ground wire can be reconnected
easily (Figure 16.)
Ground wire (spade connector)
ConƟnued...
Electric Tankless Water Heater
•
23
SERVICE
6.4 Install the new element:
NOTICE: Ensure that there is an O-ring
installed above the threads of the
element. (See Figure 20, page 25.)
C.) Secure the element by installing and
tightening the retaining nut (Figure
14, page 23). Do not overtighten.
D.) Secure the red and black wires onto
the top of the heating element. Use
the two screws that you removed
earlier.
E.) Reconnect the green ground wire
to the element’s ground terminal
(flag terminal).
6.5 Reassemble the point-of-use
water heater:
Printed on: 2/1/2024 10:35:01 AM CT
A.) Reposition both grommets as
shown in Figure 17. Ensure that
their flat surfaces press firmly against
the top plate when you reinstall it.
Figure 16.
Brass ring on point-of-use models.
B.) Reinstall the top plate and secure
it with the two screws that you
removed earlier. (See Figure 12,
page 23.)
C.) Go to step 8 on page 25.
ĐĐĞƐƐWůĂƚĞ;ďŽƩŽŵŽĨŚĞĂƚĞƌͿ
Inlet
Flat
Grommets
Flat surface presses against inside
surface of housing. See above.
7
Two- or four-element water
heaters only:
7.1 Drain the two- or four-element
water heater:
A.) Remove all six screws that secure
the access plate beneath the
element (at the bottom of the
water heater). See Figure 18.
B.) Remove the access plate and allow
the water to drain into the bucket.
Place brass ground ring
on top of element.
C.) Clean the access plate and both
seals.
D.) Make sure that both seals are
seated properly, then reinstall the
access plate. (Use all six screws
that you removed earlier.)
7.2 Remove the old element:
A.) Remove the screws that secure the
red and black wires to the top of
the heating element (Figure 19).
Use the Phillips screwdriver. Save
both screws for later use.
B.) Remove the heating element with
an element wrench.
C.) Lift the element out of the water
heater. NOTICE: As you lift the
element and O-ring out of the
opening, wrap them with a rag
to keep water from dripping onto
the circuit board.
Figure 19.
Top view of element
(two- or four-element model)
SERVICE
<ĞĞƉŇĂŐƚĞƌŵŝŶĂů
accessible.
ͻ dǁŽͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
one access plate
ͻ &ŽƵƌͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
two access plates
Figure 17.
Point-of-use models:
Grommet OrientaƟon
Outlet
Figure 18.
Access Plates:
Two- or Four-Element models only
D.)
24
•
Electric Tankless Water Heater
7.3 Install the new element:
A.) Insert the new element into its
water heater opening. Make
sure that the O-ring is positioned
properly. (See Figure 20.)
Printed on: 2/1/2024 10:35:01 AM CT
Figure 20.
11
A.) Two- or four-element water
heaters only: Take the connector
end of the cover’s ribbon cable
and plug it into the control board.
(Plug it in where you see two rows
of header pins close together, five
pins in each row.) If necessary,
refer to the “DISPLAY” callout
in the wiring diagram for your
model. (See “Wiring Diagrams” on
page 29.)
NOTICE: The plug must be oriented
correctly. (The correct orientaƟon
is shown in Figure 5, page 14.)
If you plug it in backwards, it will
not cause damage, but the display
will not work. If the display does
not work aŌer you have completed
installaƟon, 1.) disconnect power
at all branch circuits, 2.) disconnect
the plug, 3.) rotate it 180-degrees,
then 4.) plug it back in.
O-ring
B.) Tighten the element with an
element wrench until it is snug,
then tighten for 1/4 turn more.
C.) Secure the red and black wires
onto the top of the heating
element. Use the two screws that
you removed earlier. Proceed to
step 8.
8
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.
9
NOTICE: Do not restore power until
the circuit board and components are
completely dry. If water has dripped
anywhere inside the heater (during element replacement or leak check), dry it
with a hair dryer or compressed air. Be
sure to dry behind the circuit board.
B.) Reinstall the water heater’s cover.
WARNING! Be sure the cover is
reinstalled and secured to reduce
the risk of fire and electric shock.
•
Check wires with a non-contact
circuit tester to make sure power is
oī. When you are Įnished, be sure
all covers are secured to reduce the
risk of Įre and electric shock.
If you are not comfortable replacing
a thermistor yourself, have this work
done by a qualiĮed person. To replace
a thermistor, you’ll need the following
tools/supplies:
•
Phillips head screwdriver
•
1/2-inch open end wrench
•
•
Bucket (for draining the heater)
Siphon transfer pump & towels
1
Turn oī power to the water
heater.
2
Drain the water heater as
described in the draining
instructions (page 27).
3
Locate the thermistor (temperature sensor) that was
idenƟĮed by the error code.
Refer to the appropriate
Įgure on page 26.
C.) Restore power to the water
heater.
Figure 21.
D.) Run hot water from a faucet to
make sure that the water heater
is working as expected.
Top
vi
Thermistor
Thermistor
(Temperature Sensor)
Replacement
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.
SERVICE
10
Check for water leaks. Correct
any leaks that are found.
Disconnect all branch circuits
before servicing unit.
If there are no water leaks,
complete these steps:
4
Unplug the thermistor’s wires
from the control board.
Continued on page 27.
Electric Tankless Water Heater
•
25
Figure 22.
Thermistor locaƟons
(Point-of-use models)
OUTLET
Figure 24.
Thermistor locaƟons (Four-element models)
INLET
Thermistor* Connections
T-Aux
Auxiliary thermistor
T-In
Inlet thermistor
T-Out
Outlet thermistor
Intermediate
Thermistor *
(connects to
TH-2)
OUTLET
Intermediate
Thermistor *
(connects to
TH-1)
INLET
Outlet Thermistor *
(Connects to T-Out)
Auxiliary Thermistor *
(Connects to T-Aux)
Inlet Thermistor *
(Connects to T-In)
T-Aux **
T-In **
TH-1
TH-2
TH-3
TH-4
TH-IN
T-Out
Often referred to
as a temperature
sensor.
L2/N
POWER
SUPPLY
L1
** If the inlet
thermistor fails,
there is no need
to replace it.
Simply switch the
T-Aux and T-In
plugs on the
control board.
TERMINAL
BLOCK
GND
Printed on: 2/1/2024 10:35:01 AM CT
*
L1
L2
L1
L2
NOTICE:
Appearance of cap
may vary.
Outlet Thermistor *
May be located on
outlet elbow.
(connects to TH-4)
Intermediate Thermistor *
(connects to TH-3)
Thermistor* Connections
Figure 23.
Thermistor locaƟons
(Two-element models)
OUTLET
INLET
HEATING ELEMENTS
TH-1
TH-2
TH-IN
SERVICE
L1
L2
L1
L2
Outlet Thermistor *
(connects to TH-2)
Inlet Thermistor *
(connects to TH-IN)
Thermistor* Connections
TH-IN
Inlet thermistor.
TH-1
Intermediate thermistor
TH-2
Outlet thermistor
* Often referred to as a
temperature sensor.
•
Inlet thermistor.
TH-1
Intermediate thermistor
TH-2
Intermediate thermistor
TH-3
Intermediate thermistor
TH-4
Outlet thermistor
* Often referred to as a
temperature sensor.
Intermediate
Thermistor *
(connects to
TH-1)
26
TH-IN
Electric Tankless Water Heater
Inlet Thermistor *
(connects to TH-IN)
5
6
ප
Printed on: 2/1/2024 10:35:01 AM CT
ප
Remove the thermistor by
turning it counter-clockwise
with a 1/2-inch open end
wrench.
Draining the Water
Heater
Install the new thermistor in
the opening by turning it
clockwise with a 1/2-inch
open end wrench.
•
Make sure that the O-ring is
in place before you install the
thermistor.
Tighten the thermistor hand
tight, then carefully tighten
it with a wrench until it is
seated. Do not overtighten.
Plug the thermistor’s wires
into the control board. The
proper locaƟon is shown in one of the
Įgures on page 26.
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.
•
Return the water heater to
service. To do so, follow the
instructions in “Returning the
Water Heater to Service,” page 28.
•
If you have a point-of-use water
heater, go to step 5.
•
If you have a two- or four-element
water heater, go to step 6.
5
Check wires with a non-contact
circuit tester to make sure power
is oī. When you are Įnished,
be sure all covers are secured to
reduce the risk of Įre and electric
shock.
7
it must be oriented correctly. We
recommend marking the connector
and board with a marker. You will then
be able to align the marks. See also
Figure 5, page 14.
Point-of-use water heaters
only:
Drain the point-of-use water heater:
A.) Remove both screws which secure
the top plate to the water heater.
(See Figure 25.)
Figure 25.
Draining the Water Heater
Top View of Point-of-Use Model
1
ConĮrm that power is oī 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.
8
Top Plate
WARNING! Be sure the
water runs cool before
draining the water heater to
reduce the risk of scalding.
3
B.) Lift and remove the top plate.
(Removing it will protect if from
damage.)
C.) Cover the top of the water heater
with heavy towels (to prevent
water from dripping through the
openings).
Close the inlet valve to the
water heater, but leave the
hot water faucet open to
relieve pressure.
AŌer the towels are in place,
disconnect the inlet and outlet
water lines from the water heater.
Remove the heater’s cover,
then place a bucket under the
water heater to catch any
water that spills.
NOTICE: If you have a two- or fourelement model, you must unplug the
cover’s ribbon cable from the control
board. When you plug it back in later,
D.) Remove the heaƟng element as
described in “Element Removal and
Replacement” (page 22).
E.) Insert a pump hose into the water
heater’s chamber and pump all of
the water out.
F.) Reinstall the heaƟng element as
described in “Element Removal and
Electric Tankless Water Heater
•
27
SERVICE
4
Screws
Replacement” (page 22).
G.) Reinstall the inlet and outlet water
lines to the water heater.
H.) Go to step 7.
Two- or four-element water
heaters only:
6
Drain the two- or four-element water
heater:
A.) Remove all six screws that secure
the access plate beneath the
element (at the bottom of the
water heater). See Figure 26.
Returning the Water Heater to
Service
circuits, 2.) disconnect the plug, 3.)
rotate it 180-degrees, then 4.) plug
it back in.
When you are ready to return
the water heater to service,
turn on the WATER supply to
the heater.
B.) Reinstall the water heater’s cover.
WARNING! Be sure the cover is
reinstalled and secured to reduce
the risk of fire and electric shock.
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.
C.) Restore power to the water
heater. Verify proper operation.
7
8
Printed on: 2/1/2024 10:35:01 AM CT
B.) Remove the access plate and allow
the water to drain into the bucket.
C.) Clean the access plate and both
seals.
D.) Make sure that both seals are
seated properly, then reinstall the
access plate. (Use all six screws
that you removed earlier.)
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.
10
E.) Repeat steps A through D for each
access plate.
F.) Go to step 7.
Figure 26.
Access Plates:
Two- or Four-Chamber models only
SERVICE
ͻ dǁŽͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
one access plate
ͻ &ŽƵƌͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
two access plates
•
If there are no water leaks,
complete these steps:
A.) Two- or four-element models
only: Take the connector end of
the cover’s ribbon cable and plug
it into the control board. (Plug
it in where you see two rows of
header pins close together, five
pins in each row.) If necessary,
refer to the “DISPLAY” callout
in the wiring diagram for your
model. (See “Wiring Diagrams” on
page 29).
ĐĐĞƐƐWůĂƚĞ;ďŽƩŽŵŽĨŚĞĂƚĞƌͿ
28
Check for water leaks. Correct
any leaks that are found.
9
Electric Tankless Water Heater
NOTICE: If you have a two- or fourelement model, you must orient
the plug as shown in Figure 5, page
14. If you plug it in backwards,
it will not cause damage, but
the display will not work. If the
display does not work aŌer you
have completed installaƟon, 1.)
disconnect power at all branch
Replacement Parts
The following parts may be ordered
through your retailer or local plumbing
wholesaler:
•
•
Heating Elements
Thermistors
(temperature sensors)
When ordering replacement parts,
please be ready to provide your water
heater model and serial number.
WIRING DIAGRAMS
The wiring diagrams for various models
are listed in this secƟon. Locate the
one that corresponds with your model.
NOTICE: The correct wiring diagram for
your model can be found on the inside
of your water heater’s cover.
•
1 Chamber, 1 Element, 240/208
VAC (see below).
•
•
1 Chamber, 1 Dual Element,
240/208 VAC, p. 30.
See also “Electrical Requirements” on
page 8.
•
1 Chamber, 1 Element, 277 VAC,
p. 30.
•
2 Chamber, 2 Element, 240/208
VAC (other than 16kW, 18kW, or
14kW/208V), p. 31.
•
2 Chamber, 2 Element, 240/208
VAC (16 kW, 18kW and
14kW/208V only), p. 32.
The wiring diagrams are listed as
follows:
•
1 Chamber, 1 Element, 120 VAC
(see below).
1 Chamber, 1 Element, 240/208 VAC
GRN
Level
Detect
Moisture
Sense
Level
Detect
Control
Board
TH-IN
Element
TH-OUT
Relay 2
GRN
BLK
RED
BLK
RED
GRN
BLK
RED
Relay 2
BLK
RED
Power
Supply
N
BLK
GRND
RED
L2
GRND
N
GRN
GRN
RED
GRN
GR
BLK
L1
GRN
N
RED
GR
BLK
GRN
L1
BLK
RED
Power
Supply
GRN
BLK
BLK
BLK
TH-OUT
Relay 1
RED
Element
BLK
BLK
RED
RED
Control
Board
TH-AUX
RED
Relay 1
TH-IN
3-Pin Conn.
Moisture
Sense
RED
BLK
TH-AUX
GRN
3-Pin Conn.
RED
Printed on: 2/1/2024 10:35:01 AM CT
1 Chamber, 1 Element, 120 VAC
4 Chamber, 4 Element, 240/208
VAC, p. 33.
DIAGRAMS
Ground
Ground
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
Electric Tankless Water Heater
•
29
1 Chamber, 1 Element, 277 VAC
1 Chamber, 1 Dual Element, 240/208 VAC
GRN
GRN
Level
Detect
Moisture
Sense
RED
Control
Board
TH-IN
BLK
Element
BLK
TH-OUT
TH-OUT
Relay 2
BLK
Relay 2
Control Board
Element
RED
BLK
GRN
BLK
RED
BLK
RED
BLK
RED
Power
Supply
RED
GRN
BLK
RED
GND
N
Ground
Ground
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
GRN
GR
BLK
RED
RED
RED
GRN
GRN
GRN
GRN
BLK
RED
GRN
BLK
RED
N
GRN
L2
BLK
GR
GRN
L1
RED
BLK
GRN
Power
Supply
BLK
Printed on: 2/1/2024 10:35:01 AM CT
Relay 1
RED
RED
BLK Element
RED
BLK
TH-AUX
BLK
3-Pin Conn.
RED
BLK
Relay 1 RED
TH-IN
Level
Detect
Moisture
Sense
Relay 2 BLK
RED
RED
TH-AUX
Relay 1
3-Pin Conn.
Transformer
Board
DIAGRAMS
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
30
•
Electric Tankless Water Heater
L1
L2
GRND
Moisture
Sense
Relay 2
Relay 3
BLK
RED
BLK
RED
Relay 1
RED
Element 2
Element 1
RED
Element 1
BLK
BLK
RED
RED
Relay 4
BLK
Power
Supply
RED
BLK
TH-IN
RED
TH-2
RED
RED
BLK
TH-1
BLK
Level
Detect
RED
Printed on: 2/1/2024 10:35:01 AM CT
BLK
BLK
Element 2
2 Chamber, 2 Element, 240/208 VAC
BLK
RED
BLK
RED
BLK
GRN
Ground
Display
L1
L2
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
DIAGRAMS
NOTICE: 16 kW and 18 kW two-element models DO NOT use this conĮguraƟon.
14kW, 208V models DO NOT use this conĮguraƟon.
For two circuit, two-element models, see page 32. Failure to observe this
noƟce can result in equipment malfuncƟon.
Electric Tankless Water Heater
•
31
Printed on: 2/1/2024 10:35:01 AM CT
Moisture
Sense
BLK
Relay 2
Relay 3
BLK
RED
Relay 1
BLK
Element 2
RED
Element 1
RED
Element 1
BLK
BLK
BLK
Element 2
2 Chamber, 2 Element, 240/208 VAC
Used ONLY with the following two-chamber models:
• 14 kW at 208V
• 16 kW
• 18 kW
RED
RED
Relay 4
Power
Supply
BLK
DIAGRAMS
BLK
RED
BLK
GRN
Ground
RED
RED
BLK
RED
TH-IN
RED
BLK
RED
TH-2
BLK
RED
BLK
TH-1
BLK
Level
Detect
RED
L1
BLK
L2
RED
L1
BLK
Display
L2
CIRCUIT
BREAKER
A
CIRCUIT
BREAKER
B
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
NOTICE: This wiring diagram applies to the following two-element models only: 16 kW, 18 kW, and
14 kW/208 V. If you have a two-element model that is rated other than 16 kW, 18 kW, or
14 kW/208V, refer to page 31. Failure to observe this noƟce can result in equipment
malfuncƟon.
32
•
Electric Tankless Water Heater
BLK
Relay 2
Relay 4
BLK
RED
BLK
RED
BLK
RED
Relay 1
Element 4
RED
Element 3
RED
Element 2
RED
Element 1
RED
Element 1
BLK
Element 2
Moisture
Sense
RED
RED
Relay 3
Level
Detect
BLK
TH-1
Relay 6
RED
Relay 5
BLK
RED
TH-2
BLK
Relay 8
TH-3
RED
Relay 7
TH-4
Power
Supply
BLK
RED
RED
BLK
RED
BLK
TH-IN
RED
Printed on: 2/1/2024 10:35:01 AM CT
BLK
BLK
Element 3
BLK
BLK
Element 4
4 Chamber, 4 Element, 240/208 VAC
BLK
RED
RED
BLK
GRN
Ground
J7
BLK
RED
BLK
Display
L1
L2
L1
L2
CIRCUIT
BREAKER
A
CIRCUIT
BREAKER
B
USE COPPER CONDUCTORS ONLY WHEN
CONNECTING TO ELECTRICAL SERVICE.
DIAGRAMS
Electric Tankless Water Heater
•
33
APPENDIX: HORIZONTAL MOUNTING OF POU MODELS
Printed on: 2/1/2024 10:35:01 AM CT
As stated on page 12, point-ofuse (POU) models may be mounted
horizontally. Note the following:
• If a POU model is to be mounted
horizontally, it must be mounted
with brackets (provided). The
nipples must face toward the right
as shown in Figure 27.
•
Two-element and four-element
models cannot be mounted
horizontally. They must be mounted
vertically (nipples facing upward).
•
This procedure is a supplement to
“Mount Your Water Heater,” page
12.
Figure 27.
Horizontally-mounted POU water heater:
Figure 28.
Mount the brackets to the
surface as shown.
NOTICE: Read “Minimum Clearances”
(Figure 2, page 11) before you start.
See Figure 29 for fastener
locaƟons.
Complete the installaƟon
steps on pages 11 and
12. Stop when you have
completed step 7 on page 12.
1
Secure both brackets to the
wall. (See Figure 28.) Use
screws, bolts, or anchors as
appropriate. NOTE: To drill pilot holes
for the #10 screws that are provided,
use a 7/64” drill bit.
2
Figure 29.
Ensure that the mounting surface and
fasteners will support the weight of
the water heater.
Pilot hole center distances:
4.31 inches
(4 УШЕКŝŶĐŚĞƐ)
APPENDIX
Continued on the next page.
11.22 inches
(11 ХШЗЖŝŶĐŚĞƐ)
34
•
Electric Tankless Water Heater
Set the water heater on the
brackets, base plate down,
and secure it with four sets of
bolts and nuts. See Figure 30 and
Figure 31.
3
NOTICE: Ensure that the nipples face
toward the right as shown in Figure
27, page 34.
Printed on: 2/1/2024 10:35:01 AM CT
4
Return to page 12 to
complete the water heater
installation.
Figure 30.
Internal water heater components are
represented by hidden lines.
DŽƵŶƟŶŐ
Surface
Water Heater
Components
Water Heater’s
Base Plate
Bolts (X4)
(Bolt heads face upward)
Figure 31.
Internal water heater
components are represented
by hidden lines.
DŽƵŶƟŶŐ
Surface
Water Heater
Components
Brackets (X2)
Nuts (X4)
APPENDIX
Electric Tankless Water Heater
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