Domccy EC18 Guide

TANKLESS ELECTRIC WATER HEATER
INSTALLATION AND USER INSTRUCTIONS
EC18
EC24
Installer: Leave this manual with the homeowner.
Model:
READ AND SAVE THESE INSTRUCTIONS

OPERATION INSTRUCTIONS
USER INSTRUCTIONS
WARNING
TECHNICAL SPECIFICATION
Before installing, debugging, using, maintaining and repairing the tankless electric
water heater, please take time to read and understand the safety and installation and
user manual thoroughly and carefully to ensure the safety and you and that of others.
The manual contains important safety tips and instructions.
PRODUCT DIMENSIONS
WARNING
INSTALLATION INSTRUCTIONS
INSTALLATION INSTRUCTIONS
TROUBLESHOOTING
MAINTENANCE INSTRUCTIONS
IMPORTANT INFORMATION
IMPORTANT INFORMATION 2
3
3
4
5
5
6
7
8
9
11
12
▲ This water heater must be grounded.
▲ This unit should be installed by a licensed electrician or plumber in accordance with federal, state,
and local electrical and plumbing codes.
▲ This water heater is used to provide domestic hot water for household use and can provide multi-
ple outputs.
▲ If the water heater is not used, the connection with power supply shall be cut off. In order to avoid
a hazard.
▲ If it is not used for a long time in winter, To avoid damage to the container,drain the water from the
heater to avoid the water from freezing. Please cut off the power supply before emptying.
▲ Keep the instructions after installation, you may need it later to get more information and support.
▲ The company is not responsible for any damage due to the customer's discretion.Failure to
comply with the details of this manual will include,but not limited to electric leakage,water leakage
and other consequences.
NOTE: This unit has multiple power inputs. Shut off all breakers before Installation and maintenance.
CONTENTS
MOUNTING YOUR WATER HEATER
PLUMBING INSTALLATION
ELECTRICAL INSTALLATION
PRODUCT INNER STRUCTURE

USER INSTRUCTIONS
WARNING
▲ To ensure the safety of your own and that of others,you will need to read the installation manual and user
instruction carefully before operating the unit.Failure to comply with the manual may cause property damage,se-
rious injury,or death.If you have any questions,contact our company or the maintenance personnel appointed by
our company.
▲ DO NOT install this unit in a location where it may be subject to freezing temperatures. If the water inside your
tankless water heater freezes, it can cause severe and permanent damage that is not covered under our warranty.
▲ Water temperature over 125°F (52°C) can cause severe scalding. If the set temperature of the unit is too high,
there is the possibility of hot water scalding. Children, disabled persons or the elderly in small households may
need to set the temperature of the product below 113°F (45°C) in order to prevent possible harm caused by hot
water or use after mixing hot and cold water.
▲ Where children or persons with limited physical, sensory or mental capabilities are to be allowed to control
this appliance, ensure that this will only happen under supervision or after appropriate instructions by a person
responsible for their safety. Children should be supervised to ensure that they never play with the appliance.
▲ This unit has more than one power-supply connection point. Disconnect all power supplies before servicing.
▲ To avoid damage, the unit needs to be kept dry. Keep the unit away from direct sunlight, moisture, dust,
steam, and other liquids. Do not install the units in places where water can leak. (such as under air conditioning
lines that might leak or condense moisture or water pipes ).
▲ The outlet water pipe can get very hot, make sure that the outlet water pipe is out of the reach of children, and
must be insulated.
▲ This product is only used to heat water, do not use it to heat other liquids.
▲ Damage caused by water quality is not covered by the warranty.
▲ Make sure all circuit breakers and disconnect switches are off before installation and maintenance.
▲ Do not store inflammables and explosives near the water heater.
▲ Water heater will produce steam or high temperature water and cause severe burns if dry burning without
water,so please make sure to fill water in water heater,if dry burning happen, disconnect power and water imme-
diately, stop using, and call the service hotline for repair.
▲ After the water heater installation and using, the user should check and maintain it regularly. If there is any
abnormality, the user should stop using it immediately and call the service hotline for repair.
▲ If any part is soaked in water, it should be inspected or repaired by professionals before use.
▲ Please do not use damaged wires, aging, loose and non-fixed power socket, otherwise will cause electric
shock, short circuit, fire and other accidents.
▲ In case of any abnormal situation of grounding system outside of the product, stop water heater immediately,
pull of plug or disconnect all power supply circuit and call the service hotline for repair.
TECHNICAL SPECIFICATION
Note: The temperature rise data is measured under the conditions of inlet water temperature of 3℃ (37℉).
Phase Single 60 Hz
Amperage draw
Min. wire size (copper)
Min. Water Flow
Water connection
Watts
Temp
Rise
Model
@1.5GPM
@2.25GPM
@3.0GPM
3/4"NPT
208V 240V 208V 240V
Working pressure 150PSI/10BAR
Voltage
Circuit breaker(Amps)
EC18 EC24
2x38A2x33A
18.0kW13.5kW
2x40 2x40 3x30 3x40
0.66GPM/2.5L/min
2x8AWG
3x34A
24.0kW
3x29A
18.0kW
3x8AWG
61℉
41℉
31℉
82℉
54℉
41℉
82℉
54℉
41℉
102℉
73℉
54℉
3

ON/OFF: CLICK THE KNOB
PRESS 3 SECONDS
USER INSTRUCTIONS
OPERATION INSTRUCTIONS
Power On
When the main power supply is switched on, the buzzer beeps once and all the indicators light up for three seconds and
then go out except power indicator. Power indicator is on green, heating indicator and display screen are not on.
Operation
1. Press the knob (a beep can be heard) to turn on the water heater power, the LED display will turn on, it shows the
actual outlet water temperature. Heating indicator is on red in the state of heating.
Note: The unit will not work and the heating indicator is not on if there is no water flow, or the water flow do not meet the
start-up requirements (0.5GPM/1.9L/min - 0.79GPM/3.0L/min).
2. If the unit is frequently used and the intermediate interval is short, initially a short burst of very hot water from the unit
will flow out, wait a few seconds for the water to cool down to the set temperature when using.
CAUTION: Regularly clean the inlet filter and the shower head to get enough flow.
Temperature Control
In the state of heating, the outlet water temperature can be adjusted by turning the knob. Turn the knob clockwise to
increase the outlet temperature, and turn the knob counterclockwise to decrease the outlet temperature between 80°F -
140°F (26℃- 60℃), the factory set temperature is 95°F.
When the setting temperature is turned to the maximum or minimum, it will be not changed and two beeps will be heard at
the same time.
Fahrenheit / Celsius Switch
●The factory set temperature of the unit is Fahrenheit.
● In the state of heating, press the knob for 3 seconds, the display will switch between Fahrenheit and Celsius.
● When fahrenheit is displayed, the last text shows F.
● When celsius is displayed, the last text shows C.
NOTE: When the outlet water temperature reaches 167°F (75℃) the unit will stop heating.
Power indicator
Heating indicator
Temperature display
Knob
35C
95f
Fahrenheit display Celsius display
4

ON/OFF: CLICK THE KNOB
PRESS 3 SECONDS
PRODUCT DIMENSIONS
WARNING
▲ To ensure the safety of your own and that of others,you will need to read the installation manual and user instruction
carefully before operating the unit.Failure to comply with the manual may cause property damage,serious injury,or death.If
you have any questions, contact our company or the maintenance personnel appointed by our company.
▲ This unit should be installed by a licensed electrician or plumber in accordance with federal, states and local electrical
and plumbing codes.
▲ When installing or using any high voltage electrical appliance, basic safety precautions should always be followed.
▲ DO NOT install this unit in a location where it may be subject to freezing temperatures. If the water inside your tankless
water heater freezes, it can cause severe and permanent damage that is not covered under our warranty.
▲ This unit has more than one power-supply connection point. Disconnect all power supplies before servicing.
▲ To avoid damage, the unit needs to be kept dry. Keep the unit away from direct sunlight, moisture, dust, steam, and
other liquids. Do not install the units in places where water can leak. (such as under air conditioning lines that might leak
or condense moisture or water pipes ) or space with water spray.
▲ Be sure that the water heater is out of the reach of children so they cannot adjust the temperature knob at will.
▲ The outlet water pipe can get very hot, make sure that the outlet water pipe is out of the reach of children, and must be
insulated.
▲ Damage caused by water quality is not covered by the warranty.
▲ Make sure all circuit breakers and disconnect switches are off before installation and maintenance.
▲ Piping that has been treated with boiler seal, chromates, or other chemicals is not allowed to use.
▲ Special branch circuit shall be used for circuit connection of water heater ,check whether the voltage, circuit breaker,
wire diameter, electrical switch, etc. meet the parameter requirements of water heater, and the connection is reliable.
▲ If the pressure of the inlet water supply system exceeds 150 psi, a pressure relief valve should be installed between
the valve and the water heater. The pressure relief valve must be equipped with a diversion pipe which must be continu-
ously downward. The water overflowing from the guide pipe should be discharged into the floor drain.
▲ There must be a well drained floor drain near the water heater, and the installation area of the water heater should be
able to ensure that the leakage of the water heater or joint will not cause damage to the articles in the adjacent area or
the lower layer of the building.
▲ If installation personnel find that the power supply in the user's home is not standardized, a leakage protector should
be installed in the circuit of the water heater.
Attention: This water heater must be connected to a reliable earth connection at all times, ground wire and neutral line
should be strictly separated.
7 1/8" (180mm)
3 1/8"
(80mm)
13 1/8" (334mm)
14 1/4" (363mm)
17 1/8" (434mm)
5 1/8"
(130mm)
4 7/8"
(124mm)
INSTALLATION INSTRUCTIONS
5

MOUNTING YOUR WATER HEATER
BEFORE MOUNTING
* THE UNIT MUST BE INSTALLED BY A LICENSED ELECTRICIAN.
1. The wall for the installation of the water heater must be firm, solid, and able to bear four times the weight of the water
heater.
2. Indoor installation only. Do not install this water heater near flammable, volatile substances or strong magnetic fields.
The unit must be installed vertically parallel to the water pipe joint.
3. Be sure that the external power harness and air-opening meet the standard requirements.
4. Gloves are required during installation.
INSTALLATION LOCATION
There should be a certain space around the machine for
installation and future maintenance.
SUGGESTION: a (side gap): minimum 12" (305mm)
b (top gap): minimum 15" (381mm)
WARNING: c (bottom gap): keep a distance out of the
reach of children
ACCESSORIES CONTENTS
4 espansion boltes 2 gaskets
(in the red / blue pipe)
4 screw st 4.2x30
1 installation template1 user manual
7 1/8" (180mm)
5 1/8" (130mm)
14 1/4" (363mm)
WARNING: This unit should be installed by a qualified electrician or plumber in
accordance with federal, state and local electrical and plumbing codes.
WARNING: This water heater must be connected to a reliable earth connection
at all times.
WARNING: Make sure all circuit breakers and disconnect switches are off before
installation and maintenance.
WARNING: DO NOT install this unit in a location where it may be subject to
freezing temperatures. If the water inside your tankless water heater freezes, it can
cause severe and permanent damage that is not covered under your warranty.
The wall for installation of water heater must be firm and solid and can bear four
times the weight of the water heater.
WARNING: Indoor installation only. Do not install this water heater near
flammable, volatile substances or strong magnetic fields. The unit must be
installed in the vertical position of the water pipe joint.
This unit has more than one power-supply connection point. Disconnect all
power supplies before servicing.
WARNING: To avoid damage, the unit needs to be kept dry. Keep unit away from
direct sunlight moisture, dust, steam, and other liquids.
WARNING: The unit do not installed in places with water leaks (such as under
air conditioning lines that might leak or condense moisture or water pipes ).
WARNING: Be sure that the water heater are out of the reach of children so they
cannot adjust the temperature knob at will.
WARNING: The outlet water pipe can get very hot, make sure that the outlet
water pipe is out of the reach of children.
Installation location
There should be a certain space around the machine for
installation and future maintenance.
c
b
a
a
Wall or other fixed objects that cannot be moved
a (side gap): minimum 12" (305mm)
b (top gap): minimum 15" (381mm)
WALL
SUGGESTION:
WARNING: c (bottom gap): keep a distance out of the
reach of children
INSTALLATION INSTRUCTIONS
TANKLESS ELECTRIC WATER HEATERS
INSTALLATION AND USER INSTRUCTIONS
EC18
EC24
Installer: Leave this manual with the homeowner.
Model:
READ AND SAVE THESE INSTRUCTIONS
The contents of Chinese and English version are the same. In case of any slight difference,
the Chinese version shall prevail.
c
b
a
a
Wall or other fixed objects that cannot be moved
WALL
DD
DD: Inlet pipe (cole water)
EE: Outlet pipe (hot water)
EE
6

MOUNTING YOUR WATER HEATER
TOOLS/MATERIALS REQUIRED (NOT INCLUDE)
Measuring tape
Pencil
Phillips screwdriver
Slotted screwdriver
Safety gloves
Electric drill
INSTALLATION INSTRUCTIONS
1. Mark the positions of mounting holes on the wall as the installation template shows (Fig. 1).
NOTE: For ease of installation and servicing, we recommend that this unit be installed in an upright position with the inlet
and outlet water connections at the bottom.
2. Drill 4 mounting holes (Ø6x32mm) at the marked position (Fig. 2).
3. Put espansion boltes into the holes (Fig. 2).
4. Put two screws into the upper two holes (Fig. 3).
5. Remove the knob on front cover, 4 screws on the top and bottom edges of the unit, and then dismantle the front cover
(Fig.4).
Fig. 1 Fig. 2 Fig. 3
mounting hole
espansion bolte
Screw
espansion bolte
7 1/8" (180mm)
5 1/8" (130mm)
14 1/4" (363mm)
WARNING: This unit should be installed by a qualified electrician or plumber in
accordance with federal, state and local electrical and plumbing codes.
WARNING: This water heater must be connected to a reliable earth connection at
all times.
WARNING: Make sure all circuit breakers and disconnect switches are off before
installation and maintenance.
WARNING: DO NOT install this unit in a location where it may be subject to
freezing temperatures. If the water inside your tankless water heater freezes, it can
cause severe and permanent damage that is not covered under your warranty.
The wall for installation of water heater must be firm and solid and can bear four
times the weight of the water heater.
WARNING: Indoor installation only.Do not install this water heater near
flammable, volatile substances or strong magnetic fields. The unit must be
installed in the vertical position of the water pipe joint.
This unit has more than one power-supply connection point. Disconnect all power
supplies before servicing.
WARNING: To avoid damage, the unit needs to be kept dry. Keep unit away from
direct sunlight moisture, dust, steam, and other liquids.
WARNING: The unit do not installed in places with water leaks (such as under air
conditioning lines that might leak or condense moisture or water pipes ).
WARNING: Be sure that the water heater are out of the reach of children so they
cannot adjust the temperature knob at will.
WARNING: The outlet water pipe can get very hot, make sure that the outlet
water pipe is out of the reach of children.
b
b
a
a
Wall or other fixed objects that cannot be moved
a (side gap): minimum 12" (305mm)
b (bottom gap): minimum 15" (381mm)
WALL
Installation location
There should be a certain space around the machine for
installation and future maintenance
Fig. 4
Knob
Screw
Screw
INSTALLATION INSTRUCTIONS
7

PLUMBING INSTALLATION
6. Hang the body on the two installed screws, then fix the other two screws. Tighten all 4 screws to secure the body.
NOTE: Make sure that the mounting surface is solid and firm, and ensure that the unit is level prior before tighten the
screws (Fig. 5).
7. Reinstall the front cover after finishing "PLUMBING and ELECTRICAL INSTALLATION". Fasten the front cover only
after confirming that the mounting screws are firm and reliable. The front cover mounting shows as right (Fig. 6).
WARNING: The electrical components inside the water heater may cause serious personal injury or electric shock death.
Make sure that the front cover is installed correctly and firmly. Do not remove the front cover unless you are installing a compo-
nent or maintaining the device.
8. Screw the front cover to the body. Reinstall the knob (Fig. 7).
8888
Fig. 5
Screw
Screw
Fig. 6 Fig. 7
Knob
Screw
Screw
CAUTION: The plumbing installation must be completed before the electrical installation.
WARNING: It is the responsibility of the Service Person to ensure that the water supply to the equipment is provided with
protection against backflow by an air gap as defined in ANSI/ASME A112. 1.2-1979; an approved vacuum breaker or
other such methods as proved effective by test.
WARNING: Pipe dope or PVC/CPVC primer and glue are not allowed to used on the threads of the outlet and inlet
fittings. These chemicals can damage the threads and cause leaks. Only thread sealing tape can be used.
SUGGESTION: To avoid the property damage caused by leakage (small probability event), the machine must be installed
in place with a floor drain.
SUGGESTION: Install a valve (not include) at the inlet pipe for future maintenance.
WARNING: Install a pressure relief valve between valve and unit if the inlet water supply pressure exceeds 150 PSI.
INSTALLATION INSTRUCTIONS
1. Put one gasket to outlet, and another one to inlet. Facing the unit, the outlet located marked on the left side of the unit
connect to the hot water line. The inlet located marked on the right side of the unit connect to the cold water line.
Outlet pipe
(hot water) Inlet pipe (cold water)
Filter*
GasketGasket
Filter* this part is in the Inlet pipe
2. After tightening both fittings at the unit, open the hot water tap to allowd water to run through the unit for about 2 to 3
minutes, to make sure all the air is discharged from the waterpipe.
This step must be performed before power on.
IF YOU DO NOT FOLLOW THIS STEP, IT CAN CAUSE PERMANENT DAMAGE TO THE HEATING ELEMENTS.
3. Close outlet, open inlet, to check all connections for water leaks.
INSTALLATION INSTRUCTIONS
ON/OFF: CLICK THE KNOB
PRESS 3 SECONDS
8

EC18 EC24
ELECTRICAL INSTALLATION
CAUTION: Ensure that you have made the correct connections. You must follow the wire connection as shown in ensure
proper operation of the unit.
WARNING: For supply connections use 8 AWG or larger wires suitable for at least 167°F (75°C).
WARNING: This product has more than one power-supply connection point. Disconnect all power supplies before servic-
ing.
WARNING: The overcurrent protective devices are provided as a separate assembly, the product shall be used only with
this separate assembly.
WARNING: Firstly turn on the water and let it to run in the product for several minutes, and exhaust all the air in the
plumbing. At the same time, check whether there is water leakage at the internal and external water connections of the
product.
WARNING: To avoid a short circuit and circuit board is damaged, , make sure all strands are secure inside the terminal
block.
Before installing the water heater, make sure that your home has enough power to handle the maximum current available
for this product.
As with all high-power electrical products, Make sure to turn off all power to the product directly at the fuse or breaker box
before installing, repairing, disassembling this water heater.
All circuit protection (breakers) and wiring (wire gauge) must conform to the US National Electrical Code (NEC) in the
America or Canadian Electrical Code (CEC) in Canada.
Failure to comply with these warnings can lead to risks include fire, electrical shock, death, and void your
warranty.
Before starting the electrical installation work, make sure that all water pipelines have been installed and the main circuit
breaker and power switch has been closed to prevent electric shock.
CIRCUIT CONNECTION
1. Connect each group of power wires to a circuit breaker in pairs (show as below). Make sure that each circuit breaker is
connected one group of L1 and L2.
EC18 need two circuit breakers.
EC24 need three circuit breakers.
Circuit
breaker
Circuit
breaker
Circuit
breaker
GL2 L1 L2 L1 L2 L1
123456
Ground
Circuit
breaker
Circuit
breaker
Ground
GL2 L1 L2 L1
1234
2. When connecting the power cords to the terminal block, make sure that the wire and the electric conductor inside the
terminal block are in full contact. Then tighten the screws. If it is loose, May causing an electrical short circuit and/or the
terminal block burns out.
3. Again to make sure that the wiring from the main circuit breaker to the water heater is correct. If the wrong wires is
connected, the product will not work normally and may cause unnecessary danger.
4. Check earth resistance and make sure there is a proper earth continuity.
5. Confirm that all the air has been purged from the waterpipe prior to turning on power to the unit.
INSTALLATION INSTRUCTIONS
9

EC18
EC18
EC24
EC24
WIRING DIAGRAM
GL2 L1 L2 L1 L2 L1
123456
GL2 L1 L2 L1
1234
NOTE: The rated voltage is 240VAC. If the connected power supply is 208VAC, please turn the dial switch on the
display PCB to the upper side with a slotted screwdriver.
208VAC
240VAC
8888
208VAC
240VAC
CIRCUIT DIAGRAM
L2
connector
L1
L2
L1
L2
L1
R1
R3
G
R2
heating
element
heating
element
heating
element
PCB 3
PCB 3
PCB 3
PCB 1
thermal cut-out
thermal cut-out
thermal cut-out
t0 t1
flow sensor
temperature
sensor
PCB 2
triac
triac
triac
L2
connector
L1
L2
L1
heating
element
heating
element
R1
G
R2
PCB 3
PCB 3
PCB 1
thermal cut-out
thermal cut-out
t0
t1
flow
sensor
temperature
sensor
PCB 2
triac
triac
INSTALLATION INSTRUCTIONS
10

EC18
EC18
EC24
EC24
INSTALLATION DIAGRAM
HOT
WATER
COLD WATER
CIRCUIT
BREAKER
CIRCUIT
BREAKER
CIRCUIT
BREAKER
DISCONNECT
SUB PANEL
HOT
WATER
COLD WATER
CIRCUIT
BREAKER
CIRCUIT
BREAKER
DISCONNECT
SUB PANEL
PRODUCT INNER STRUCTURE
L1L2L1L2G
L1L2L1L2L1L2G
PCB box
SCR
Flow
sensor
Terminal
block
Inlet
temperature
sensor
Heating
body
Thermal
Cut-off
Outlet
temperature
sensor
Knob
PCB box
SCR
Flow
sensor
Terminal
block
Inlet
temperature
sensor
Heating
body
Thermal
Cut-off
Outlet
temperature
sensor
Knob
INSTALLATION INSTRUCTIONS
ON/OFF: CLICK THE KNOB
PRESS 3 SECONDS
ON/OFF: CLICK THE KNOB
PRESS 3 SECONDS
11

TROUBLESHOOTING
PROBLEM ISSUE POSSIBLE CAUSE SOLUTION
Display E1 / E0
Display E2 / E3
Display LL
Inlet temperature sensor failure.
Inlet temperature lower than 37°F (3℃)Unit does not work when the inlet temperature is
lower than 37°F (3℃).
Display HH Outlet temperature higher than 167°F
(75℃)
Unit does not work when the outlet temperature
is higher than 167°F (75℃).
Display E4 The inlet and outlet pipes are reversed. Please check if the the inlet and outlet pipes are
reversed. If reversed turn off the unit and
reconnect the inlet and outlet pipes.
Display LF
Contact local dealer.
Contact local dealer.
1. Make sure that the main circuit breakers that
supply the water heater is on.
2. The unit may have a wiring error.
3. There may is a problem with the circuit breaker.
4. Contact local dealer.
Outlet temperature sensor failure.
1. Turn up the setting temperature.
2. Reduce water flow.
3. If the first installation is complete, please let
the electrician check the wiring carefully. The
wiring may be incorrect.
If not, contact local dealer.
4. Check the power supply.
5. Replace temperature sensor.
6. Replace the heating element.
Water leakage at the inlet
and outlet connector.
1. The connector is not installed in place.
2. Seal damage.
1. Tighten the connector.
2. Replace the seal.
The unit does not work
(Power indicator is NOT on)
Incorrect power wiring connection or
no power.
Water heater is not heating
at all (Power indicator is on)
Water heater is working but
the outlet temperature is not
hot well.
1. Low Setting temperature
2. Excessive water flow
3. Faulty wiring
4. Voltage too low.
5. Temperature sensor failure.
6. Heating element damaged.
1. Turn down the setting temperature
2. Increase water flow
3. Cut off the power and contact local dealer.
Water heater is heating but
the outlet temperature is too
hot.
1. Temperature set too high.
2. Low water flow
3. PCB failure
Clean them
The outlet flow is reduced. Inlet filter, shower or faucet clogged.
1. No water flow.
2. The flow is too small to start the unit.
3. Control board failure.
The flow of inlet too small to start the unit.
1a. Check the water supply channel;
1b. Clean filter at unit;
1c. Clean faucet aerator or shower head.
2. Increase water flow.
3. Cut off the power and contact local dealer.
Increase the inlet pipe flow.
MAINTENANCE INSTRUCTIONS
If you have any trouble about installation or usage, please email us or visit our website
[email protected]
12