Page 1
Hot Water on Demand
118
º
F
Installation and Operation Guide
Thermo-Pro Thermostatic Series
18kW, 21kW, 24kW
www.atmorusa.com
Page 2
Safety GuidelinesTable of Contents
Description Page
Safety Guidelines ..........................................................................................................................2
Technical Information .....................................................................................................................3
Plumbing .................................................................................................................................... 4-5
Mounting ........................................................................................................................................5
Installation Procedure ................................................................................................................ 6-8
Wiring ............................................................................................................................................9
Starting the system ......................................................................................................................10
Operation Guid ............................................................................................................................11
Care and Maintenance ................................................................................................................13
Troubleshooting ...........................................................................................................................14
OVERVIEW
Read this manual thoroughly before attempting to
install the instant water heater.
Failure to follow the safety instructions in this
manual may cause damage to the unit, and could
also result in property damage, personal injury, or
loss of life.
Failure to comply with the safety, installation or
operating instructions voids the product warranty.
The product manufacturer and the product distributor
will not be liable for any damages or injury because
The heater must
be installed by
professional
01
04 05
06
technician and
according to
the installation
instructions
The heater
must be
installed
according to
the installation
instructions
(see gures).
The plumbing
installation
must be
completed
before the
electrical
installation.
02
of failure to comply with the installation and operating
instructions specied in this manual or because of
improper use.
Never attempt to install, disassemble, inspect or repair,
disassemble or service the water heater without rst
shutting off all power to the unit by means of the circuit
breaker on the main electrical panel.
The water heater must be installed in a manner that
prevents contact with combustible materials. Keep
combustible materials at least two feet away from the
heater and hot water output pipe.
Caution:
The
appliance
must be
grounded.
A pressure reduction device (PRD) must
be installed on the heater’s incoming water
supply line prior to installing the unit. The
maximum recommended operating water
pressure is 8 bar.
The heater
operates at
a minimum
water ow rate
of 0.5 gallon/
minute.
03
0807
withstand a minimum pressure
of 8 bar. (Other types of pipes
will cause damage.)
A dedicated
circuit breaker
must be
installed on
the power
distribution
panel.
The plumbing
installation
requires metal
or reinforced
pipes that can
Do not install
the heater
09
sunlight, rain and/or a
constant spray of water or
freezing temp.
where it may
be subjected
to direct
10
To be in compliance EN 61000-3-11,
the product shall be connected only to a
supply of the system impedance: I Zsys I =
0.07673ohms less. before connect the product
to public power network, please consult your
local power supply authority to ensure the
power network meet above requirement.
21
Page 3
Technical Information
Plumbing
Electrical Specications
Thermo-Pro
18 kw
Heating elements 3 3 3
Watts 18,000 21,000 24,000
Kilowatts 18 kW 21 kW 24 kW
Voltage 240 V 240 V 240 V
Circuit Breaker Amperage 3 x 30 A 3 x 40 A 3 x 40 A
Breaker/Relay 3 x double-pole 3 x double-pole 3 x double-pole
Total Connection Load 75 A 87.5 A 100 A
Cable Size (minimum) 3 x 8 AWG 3 x 8 AWG 3 x 8 AWG
Plumbing Specications
Minimum water ow to activate unit 0.5 gpm
Working pressure 0.5–10 bar (7–145 psi)
Tested pressure 20 bar (290 psi)
Water connections 3/4" NPT
Flow Rate
Temperature Rise
Δt (°F)
81 1.6 1.8 2
74 1.7 1.9 2.2
63 2 2.2 2.5
54 2.4 2.7 3
45 2.85 3.2 3.6
36 3.6 4.1 4.5
Physical Dimensions
Height Width Depth Weight
3
/8 in.
13
(340 mm)
(440 mm)
Thermo-Pro
18 kw
17 3/8 in.
Thermo-Pro
21 kw
Flow Rate (gpm)
Thermo-Pro
21 kw
5 1/4 in.
(135 mm)
Thermo-Pro
24 kw
Thermo-Pro
24 kw
17 lbs
(7.7 kg)
01 02
The plumbing installation
must be completed before
the electrical installation.
Residential plumbing systems with
unstable pressure or pressure above 5
bar require the application of a pressure
stabilizer valve, set to 4–5 bar.
Copper water pipes are recommended for
use within three feet of the unit’s water inlet
05
06
08
and outlet. Other types of piping can be used
provided that are rated for high temperature
applications.
If installing the heater on an upper oor or in
an attic, be sure installation is in compliance
with local code. Install a drip pan with
drainage, or a leak detector and automatic
shutoff valve, to prevent damage in case of
a leak.
Before proceeding to electrical
installation, run water through the unit
for several minutes to ush out any air
bubbles from the water line.
A pressure reduction device (PRD) must
be installed on the heater’s incoming
water supply line prior to installing the
unit. The maximum recommended
operating water pressure is 8 bar.
0403
The plumbing installation
requires pipes or reinforced
exible hoses that can
withstand pressure up to
8 bar and that are rated
for high temperature
applications.
07
After plumbing installation
is completed, carefully
inspect all connections,
unions, and the pressure
relief device for leaks.
43
Page 4
Mounting
Assembly Instructions
The mounting surface
must be solid and secure.
01 02
Use mounting screws
that are at least 1 inch
in length.
Make sure the unit is
level prior to securing the
mounting screws.
The water heater must be installed in a manner that prevents
contact with combustible materials. Keep combustible materials at
06
least two feet away from the heater and hot water output pipe.
The water heater and hot water outlet pipe must be securely out of
the reach of children to prevent tampering with controls or contact
with an extremely hot pipe.
0403
The unit must be installed
in an upright position with
the water inlet and outlet
at the bottom.
05
Do not install the unit
above electrical boxes
or junctions.
Connect the Pressure Relief Device (PRD)
to the unit (Fig1)
01
Note: IMPORTANT – do not discard
this step. A PRD must be installed.
03
Disconnect the cable
from the PCB within
the unit. (Figure 3)
Connect the incoming water line
to the heater inlet (on right side),
05
and connect the outgoing water
line to the heater outlet.
Use a hose that can withstand
pressure up to 8 bar (Figure 5).
04
02
Remove the appliance
covers (Figure 2).
Mount the unit on the wall with 4 screws
at the marked points. (Figure 4)
Make sure the unit is horizontally level,
with water inlets and outlets at the
bottom. (Figure 5)
06
Run water through the
unit for one minute, and
make sure there are no
leaks
07
If installing the heater on an upper oor or in an attic, be sure
installation is in compliance with local code. Install a drip pan
with drainage, or a leak detector and automatic shutoff valve, to
prevent damage in case of a leak.
07
Make sure power to the unit is shut off by means of the dedicated
circuit breakers on the main electrical panel.
Run the power cable wires from the circuit breakers on the main
electrical panel to the water heater.
Connect the power cable to the terminal block within the unit.
Make sure the correct breaker size and wire gauge have been used.
Make sure all wire connections are tight and secure.
Make sure the unit is connected to a ground in accordance with
applicable codes. (Figure 6)
65
Page 5
118
º
F
1
Washer
Pressure
relief
device
2
Assembly Instructions
1
104ºF
09 1008
Reconnect the cable to
the PCB within the unit.
(Figure 3)
2
104ºF
Restore power to the unit by means
of the dedicated circuit breakers on
11
the main electrical panel.
3
118ºF
12
Do not install the heater where it may
be subject to direct sunlight, and
freezing temperatures.
Replace the front
cover onto the unit and
reattach it with 2 screws.
(Figure 2)
Before turning on power
to the water heater,
open several hot water
faucets and allow water
to run through the unit for
several minutes to purge
any air from the heater
and water lines.
This step must be
performed before turning
on power to the heater.
Failure to perform
this step may result in
permanent damage to
the heating elements.
4 5
L1L2L1L2L1
18kw-24kw
L2
6
Note: Neutral (N)
does not need to
be connected.
Water
Filter
13
Install the unit in a location that does
not require signicant modications
to plumbing and near the main
electrical panel.
87
Page 6
Electrical Diagram
118
º
F
2 Phase, 18kW, 21kW, 24kW
TRIAC 3
TRIAC 2
TRIAC 1
SNSR3
TEMP SENSOR
SNSR1
FLOW SENSOR
H3
H2
H1
SNSR2
TEMP SENSOR
T1
T2
T3
HEATER CONTROL
CTRL1
HEATER
DISPLAY
TERMINAL
BLOCK
L1
L2
L1
L2
L1
L2
GROUND
BAR
Starting the system for the rst time
01 0302
Turn the temperature
knob clockwise to activate
the heater to display
outlet temperature.
With water running through
the unit, turn the knob to
adjust the temperature.
The recommended
temperature setting is
118°F (48°C).
BA
The water heater
is now ready for
operation.
T1, T2, T3 = Thermostat
H1, H2, H3 = Heating Element
SNSR2 = Inlet Temperature Sensor
SNSR3 = Inlet Temperature Sensor
C D
A Temperature setting knob
B Digital temperature display
C Hot water outlet
E
(to be connected to the main hot water pipe)
D Pressure relief device (PRD)
E Cold water inlet
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Page 7
Operation Guide
Operation Guide
Operating Instructions for the Home Owner
This electric water heater is designed to supply hot water for a house or apartment. Unlike a
conventional tank storage water heater, this unit is a tankless water heater that does not store hot
water. However, once you begin using the system, you will nd it operates much like a conventional
tank system.
Tankless systems deliver hot water instantaneously on demand. Since a tankless system does not
waste energy continually heating water that is idly sitting and losing heat in a storage tank, it provides
greater energy efciency than a conventional system.
With your new system, as soon as you turn on a hot water faucet, the demand for hot water is
detected, and high power heating elements are activated. Sensors continually monitor water ow
rate and incoming and outgoing temperature, and transmit data to the system controller, which
determines the exact amount of power required by heating elements to reach the set temperature.
It is important to keep in mind that all tankless water heaters are subject to a maximum ow rate. If
this ow rate is exceeded, the heater will not be capable of fully heating water.
Also keep in mind that conventional tank heaters are set to high temperatures to prevent running
out of hot water quickly, and thus a large amount of cold water needs to be mixed in to reach a
comfortable level for washing and showering. Since this unit heats water on demand, it is designed
to heat to a lower temperature. This means you only need to mix in a small amount of cold water,
or none at all.
Your hot water supply may also be affected by the incoming water temperature. During winter, if
incoming water temperature is very cold, you might not be able to run multiple hot water outlets at
the same time. However, you can run showers back-to-back without having to wait for water to heat.
Setting the Output Water Temperature
To set the temperature, rst turn on a hot water faucet and allow water to run through the heater.
The digital display lights up and shows the current temperature setting.
To increase or lower the temperature setting, press the UP or DOWN button.
Temperature can be set to a level from 90°F to 135°F (30°C to 57°C).
A comfortable temperature for bathing and showering is between 98°F and 105°F (37°C to 41°C).
The recommended temperature setting is 118°F (48°C), which will deliver hot water for all household
needs at a maximum water ow rate. A higher temperature setting is not recommended, as it can
cause serious scalding injuries to children and elderly persons. Higher temperatures also produce
more scale buildup in water heating devices.
Freezing Temperatures
If the ambient temperature falls below 32°F (0°C), protect the heater from potential damage. Shut
off power to the unit by means of the dedicated circuit breaker on the main electrical panel. Open
a faucet slightly to cause water to ow continuously through the device at a very low rate, without
heating. Restore power to the unit when temperature conditions allow.
If the water inside the heater freezes, it can cause damage that is not covered by warranty. If you
suspect water has frozen within the unit, do not turn it on until you are certain the frozen water has
melted and there are no leaks in the unit. It is recommended to contact a qualied electrician or the
manufacturer for service in this situation.
Leak Detected
If you detect a water leak from the water heater: Turn off the water supply at the shutoff valve on
the unit’s incoming water supply line, shut off power to the heater, and contact your local authorized
distributor for service.
Care and Maintenance
The water heater has no required maintenance procedures, but periodic inspections and tests are
recommended.
Remember that water heated to higher temperatures produces scale buildup much faster than at
lower temperatures.
Clean the lter once a half year.
Electrical connections should be tested once a year by a qualied technician.
Plumbing connections on the water heater should be inspected at least once a year for any signs of
damage or failure. If the water supply has a high level of mineralization (hard water), the water heater
should be inspected and descaled more frequently.
As a result of maintenance or a water stoppage, air may be introduced into the plumbing system.
Under such circumstances, follow the steps below to ensure the unit can safely resume operation.
Stopping and restarting the system due to servicing, water stoppage,
or other interruptions of operation
1211
Page 8
Care and Maintenance
Press the power switch to the OFF
position.
01 02
03
05
Shut off all power to the unit at the
circuit breaker on the main electrical
panel.
Open one or more hot water faucets and
allow water to run through the unit for
several minutes to purge any air from the
heater and water lines.
This step must be performed before
turning on power to the heater.
Failure to perform this step may cause
permanent damage to the heating
elements.
With water running through the unit, check
and reset the temperature if necessary.
The recommended temperature setting is
118°F (48°C).
Perform the maintenance
or servicing tasks.
04
Reconnect power to
the unit at the circuit
breaker on the main
electrical panel.
Press the power switch
to the ON position.
Troubleshooting
Before calling for service, check the troubleshooting list of common issues.
If you are unable to resolve a problem, contact your local authorized distributor.
PROBLEM ISSUE POSSIBLE CAUSE SOLUTION
Water not hot
enough.
Water too hot. The water ow rate through
Heater shuts off
during use.
Water stops
owing.
Water temperature
varies from hot to
cold during use.
No hot water even
though the shutoff
valve on the unit’s
incoming water
supply line is fully
open.
The water ow rate exceeds
the heating capacity of the
heater.
Temperature setting is too
low.
Water pressure is less than
0.5 bar (7 psi).
Electrical malfunction.
the heater is too slow.
Temperature setting is too
high.
Power outage or faulty
wiring.
Blockage in water pipes or
hoses.
No water supply.
Water pressure has dropped
below minimum level.
Power outage or faulty
wiring.
The ow rate needed to
activate the heating element
(0.5 gpm) has not been
reached.
Reduce the water ow rate at the
faucet or slightly close the shutoff
valve on the unit’s incoming water
supply line to reduce the water ow
rate.
Increase the temperature setting on
the unit.
Make sure the shutoff valve is fully
open and the water supply line is not
blocked.
Contact a qualied electrician or your
local authorized distributor for service.
Increase the ow rate at the water
outlet.
Switch to a lower temperature setting.
Check the power supply. Check the
circuit breaker.
If problem persists, contact a qualied
electrician or the manufacturer.
Make sure the main water line
valve is fully open and there are no
obstructions in the water supply line.
Increase the ow rate from the water
supply source.
Check the power supply. Check the
circuit breaker.
Increase the ow rate from the water
supply source.
Clean the lter screen on the unit’s
water inlet.
If you have an issue and need further assistance,
please call: 1-888-783-6082
1413
Page 9
LIMITED WARRANTY
Atmor Industries Ltd. warrants to the original owner of this instant water heater that it will
be free from defects in workmanship and material for a period of two years from the date of
purchase, and free from leakage for a period of seven years from the date of purchase. Should
any part(s) prove to be defective during this period, Atmor will be responsible for replacement
of the defective part(s) only. Atmor is not responsible for labor charges or any incidental or
consequential expenses.
Should the owner wish to return the water heater for repair, the owner must rst secure a
written authorization from Atmor. The owner will be required to show proof of purchase date
and to pay all transportation costs to return the defective part(s) or water heater for repair or
replacement.
Warranty is void if: (a) the water heater has been installed or used improperly; (b) the design
has been altered in any way; (c) the water heater has been installed and/or serviced by
someone other than a licensed electrician; or (d) the water heater has been installed or used in
contradiction to installation instructions, applicable laws and/or ordinances.
Distributed by:
PARAGON GROUP USA LLC
Englewood, NJ 07631
USA
Phone: 1-888-783-6082
Email: info@paragongroupusa.com
Web: www.atmorusa.com
P.N. 196183
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