Atmor AT900-04 Operating instructions

www.atmor.net
Hot Water on Demand
Installation and Operation Guide
900 Series InLine
3kW-13kW

OVERVIEW
This manual must be read carefully before attempting to install the water heater. If you do not follow the safety
rules or the instructions outlined in this manual, the unit may not operate properly and it could cause property
damage, serious bodily injury or death.
Atmor will not be liable for any damages because of failure to comply with the installation and operating
instructions outlined in this manual or because of improper use. Improper use includes the use of this appliance
to heat any liquid other than water. Failure to comply with the installation and operating instructions or
improper use voids the warranty. Never remove the unit’s cover unless the electricity is turned off.
Safety Instructions
1
01
04
07
03
06
09
02
05
08
The water heater must
be installed by a licensed
electrician and in compliance
with all local electrical and
building regulations.
The heater must be installed
according to the installation
instructions (see gures).
The plumbing installation
requires metal or reinforced
pipes that can withstand a
minimum pressure of 8 bar.
(Other types of pipes will
cause damage.)
Caution: The appliance must
be grounded.
The plumbing installation
must be completed before
the electrical installation.
Do not install the heater
where it may be subjected
to direct sunlight, rain and/
or a constant spray of
water.
A dedicated circuit breaker
must be installed on the
power distribution panel.
The heater operates at a
minimum water ow rate of
0.5 gallon/minute.
Always contact your
local authorized licensed
proffessional for service.

Technical Information
Model Guide - kW Output
2
Model *Wattage Voltage Amperage Phase
Circuit breaker
size
Required wire
size
AT900-03 3 kW 110 27 1 30 10 AWG
AT900-04 3.8 kW 240 16 1 20 12 AWG
AT900-06 6.5 kW 240 27 1 30 10 AWG
AT900-08 8.5 kW 240 36 1 40 6 AWG
AT900-10 10.5 kW 240 44 1 50 6 AWG
AT900-13 13 kW 240 55 1 60 4 AWG
Minimum water ow to activate unit: 0.5 GPM
Nominal water volume: 0.11 gal (0.42l)
Working pressure: 0.5 -8 bar (7 -115 psi)
Tested pressure: 16 bar (230 psi)
Water connections: 1/2" NPT
Dimensions (in) (H x W x D): 7.3 x 11.8 x 3.55
Weight (Ib): 3.4
Model 240V 208V 110V 120V
AT900-04 3.8 kW 2.8 kW - -
AT900-06 6.5 kW 4.9 kW - -
AT900-08 8.5 kW 6.4 kW - -
AT900-10 10.5 kW 7.9 kW - -
AT900-13 13.0 kW 9.8 kW - -
AT900-03 - - 3.0 kW 3.5 kW
* Wattage based on maximum voltage.

01
05
06
02
04
03
Remove the appliance
covers (Figure 2).
Connect the Pressure Relief
Device (PRD) to the unit (Fig1)
Note: IMPORTANT – do not
discard this step. A PRD
must be installed.
Connect the water inlet hose to the entry point of the heater (left side
inlet), and connect the outlet hose to the water outlet. Use a hose that
can withstand a minimum pressure of 4 bars. Using any other type of
hose will cause damage (Figure 5).
Residential plumbing systems with unstable pressure or pressure
above 5 bar require the application of a pressure stabilizer valve, set
to 4 – 5 bars.
Do not install the appliance with water inlets and outlets at the
top (Figure 6)
Mount unit to wall with 4 screws at the
marked points (Figure 4)
The appliance must be mounted
horizontally, with water inlets and outlets
at the bottom (Figure 5)
1. Mount ground plate
to wall.
2. Pull wires through.
3. Cut out hole in back
of unit (Right/Left
back) and pass wires
through
(Figure 3)
Assembly Instructions
3

4
2
3 4
65
G = Green or Yellow
N = White
L1/L2 = Black
1Rubber
Cold Hot
PRD
*
L1 L2 N**
*3a)
3kW
*3b)
3.5-8.5kW
*3c)
8.6-13kW Note: Neutral (N)
does not need to
be connected.
L1
L1
L2
N
(L2)
L1G
G
N
NL1
L1G
G
NL1
L2

5
07
1009
13
08
It is recommended that the appliance electrical
connections be tested once a year by a qualied
technician.
Run the water ow for
one minute to check for
leakage before connecting
to power.
Reattach the front cover of the heater
and secure it with 4 screws and then
slide the bottom gray cover
Connect the power cable to the
terminal block.
Caution: The heater must be
grounded.
Reference gure *3 on page 4 and
Electrical diagram on page 6
When installed outdoors,
the heater must be
placed in sealed
waterproof electrical box.
Make sure that the
appliance is lled with
water before connecting
power. (Repeat step 7)
11 12
Do not install the heater
where it may be subject to
direct sunlight.

6
Electrical Diagram
1. Terminal block
2. Thermal cut-out with reset
3. Thermal cut-out
4. Relay
5. Light
6. Switch 0- Off
(Option) 1- Low
7. Heating element
8. Read sensor
1. Terminal block
2. Thermal cut-out with reset
3. Thermal Cut out
4. Relay
5. Switch 0- Off
1- Low
2- Medium
3- High
6. Heating element
7. Read sensor
8. EARTH(G) Connection in
the heating canister
411 53 6
78
L1
L2(*N)
E(G)
L
N
E(G)
1
1
L
E(G)
N
L1
E(G)
L2(*N)
1. Terminal block
2. Thermostat with reset
3. Thermostat
4. Switches with lights
5. Relay
6. Heating elements
7. Read sensor
8. EARTH(G) Connection in
the heating canister
L1
L2(*N)
E(G)
5 64
12 7
3
L
N
E (G)
8
1
8.6kW-10.5kW (240V)
10.6kW-13kW (240V)
1. 3-3.4kW (110V) - Install Line 1 (L1), E(G)-Ground, N (Neutral)
2. 3.5-8.5kW (240V) - Install Line 1 (L1), E(G)-Ground, Line 2 (L2)
L1/L2 = Line1/Line2 (Black or Red)
E(G) = Ground (Green/Yellow)
*N = Neutral (White or Silver)
*Neutral acts as Line 2 (L2) for 220V/240V
*Neutral does not have to be connected for 3.5kW-13kW

Operation Guide
Troubleshooting
7
MODEL kW kW kW
AT900-03 1 2 3
AT900-04 1.6 2.2 3.8
AT900-06 3 3.5 6.5
AT900-08 3.8 4.7 8.5
AT900-10 5.25 5.25 10.5
AT900-13 4.5 8.5 13
PROBLEM ISSUE POSSIBLE CAUSE SOLUTION
Water not hot
enough.
Too much water owing
through the heater.
Reduction in the ambient
temperature.
Water Pressure below of
0.5 bar (7 psi).
Electrical Malfunction.
Reduce the ow rate of the water via
the outlet tap.
Switch to higher temperature setting.
Check if the main water line stop
valve is fully open and that there
are no other restrictions in the water
supply line.
Have the Heater unit check by a
qualied eIectrician or contact your
local authorized distributor.
Low Medium High

Troubleshooting
8
PROBLEM ISSUE POSSIBLE CAUSE SOLUTION
Water too hot. Not enough water owing
through the heater.
Increase in the ambient
temperature.
Increase the ow rate via the outlet
tap.
Switch to lower temperature setting.
Heater shut off
during use.
Interruption of main
electrical supply.
Check incoming power supply, MCB,
switches and supply cabling.
If problem persists, call your local
authorized distributor for assistance.
Water ceases to
ow.
Blockage of your hand held
shower head.
No water supply.
Clean or replace your hand held
shower head. Check to see that your
shower head hose is not twisted or
blocked. It is necessary for the hose
to have a free passage of water.
Check if the main water line stop
valve is fully open and that there
are no other restrictions in the water
supply line.
Water temperature
varies from hot to
cold during use.
Water pressure has
dropped below min. level.
Increase hot water supply.
No hot water/Unit
is not working.
No electrical power.
Low ow rate 0.5 bar (7 psi).
Check the circuit breaker and check
voltage at the wiring block.
Clean lter screen:
1. Turn circuit breaker off.
2. Open the valve to release pressure
from the unit.
3. Turn circuit breaker on.
If you have an issue and need further assistance,
please call: 1-888-783-6082

3. Cold water inlet
2. PRD
5. Hot water outlet (to be
connected to the main hot
water pipe)
1. Switches
9
Parts

10

LIMITED WARRANTY
Atmor warrants to the original owner that our instant water heaters 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 shall 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: (i) water heater has been installed or used improperly; (ii)
design has been altered in any way; (iii) water heater has been installed and/or serviced by
someone other than a licensed electrician ; (iv) or if the water heater has been installed or used
in contradiction to installation instructions, applicable laws and/or ordinances.
Distributed by:
PARAGON GROUP USA LLC
15 Engle Street, 3rd Floor
Englewood, NJ 07631
1-888-783-6082
P.N. 115045C