18 • Commercial Electric Water Heater Use and Care Guide
INSTALLATION
Step 9:
Make electrical
connections
WARNING! Working on an
energized circuit can result in severe
injury or death from electrical shock.
NOTICE:
Do not turn electrical power
on unless you are sure all of the air
is out of the tank and the tank is
completely full of water. If power is
applied before the tank is completely
full of water, the upper element will
burn out (Dry Fire).
1
Be sure the electrical power
to the water heater is turned
OFF at the circuit breaker
panel (or remove the circuit’s fuses).
2
Using a non-contact circuit
tester, check the wiring to
make certain the power is OFF.
3
Check the water heater’s
data plate and ensure that
the voltage, wiring size
(ampacity) and circuit breaker rating
and type are correct for this water
heater. Refer to the wiring diagram
located on the water heater for the
correct electrical connections. Ensure
that wire sizes, type, and connections
comply with all applicable local codes.
In the absence of local/provincial
codes, follow the “Canadian Electrical
Codes” CSA C22.1 current.
4
Open the upper access panel
and fold away the insulation
to access the electrical
junction box.
Figure 18 -
The water heater’s electrical
requirements can be determined from the data
plate.
5
Install wiring in an approved
conduit (if required by local
codes). Use a UL listed or CSA
approved strain relief to secure the
electrical wiring to the water heater.
6
Connect the ground wire to
the green ground screw.
Connect the power wires to
the terminal block for single-phase or
3-phase operation as desired (see
page 10).
Figure 19 -
Connecting the electrical wires.
Fold the insulation back in
place, close the upper access
panel and secure with the
screw provided.
WARNING! Be sure cover is secured
to reduce the risk of fire and electric
shock.
NOTICE: The tank must be
completely empty of air and
full of water before connecting
electrical power to avoid “Dry
Firing.” Dry Firing may result in
the upper element burning out.
This is a common installation
mistake. After you make the
water connections, but before
you connect the electrical power,
open a hot water faucet and let
the water run full until all the
air is removed. Let the “hot”
water run full for three minutes
or longer before connecting any
electrical wires. A Dry Fired upper
heating element is an installation
error and is not covered under
warranty.
If Dry Firing occurs, replace the
upper heating element according
to the instructions on page 25.
INS
TALLA
TION
7
