ELECTRICAL INSTALLATION
ELECTRICAL INSTALLATION
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 or 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 the
Canada .
Failure to comply with these warnings can lead to the
risks include fire, electrical shock and/or 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 have been closed to
prevent electric shock.
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 160°F (75°C).
WARNING:
This product has more than one power-supply
connection point. Disconnect all power supplies before
servicing.
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 damage the circuit
board, make sure all strands are secure inside the terminal
block.
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
EI18
EI24
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
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
Circuit Diagram
Wiring diagram
208VAC
240VAC
8888
208VAC
240VAC
G
L2
L1
L2
L1
L2
L1
1
2
3
4
5
6
G
L2
L1
L2
L1
1
2
3
4
EI18
EI24
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.
EI18 need two circuit breakers.
EI24 need three circuit breakers.
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 electrical short circuit
and/or the terminal block burn out.
Circuit
breaker
Circuit
breaker
Circuit
breaker
G
L2
L1
L2
L1
L2
L1
1
2
3
4
5
6
Ground
Circuit
breaker
Circuit
breaker
Ground
G
L2
L1
L2
L1
1
2
3
4
EI18
EI24
3. Again 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 water
lines prior to turning on power to the unit.