Atmor AT91027TP Installation Manual
Hot Water on Demand
118
º
F
Installation and Operation Guide
Thermo-Pro Thermostatic Series
18kW, 21kW, 24kW
www.atmorusa.com
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
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
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