Electrical Connection; Wire Sizing; Fusing - Lochinvar Commercial Electric Water Heaters Installation And Service Manual

ELECTRICAL CONNECTIONS
All installation procedures involving electric power
connection should only be performed by a trained, certified
electricians.
FIG. 4 Electric Power Connections - Electrical Control
Panel
WARNING:
WATER HEATER IS EQUIPPED FOR OPERATION
ON ONE VOLTAGE ONLY. Check the rating plate
on the front of the control panel access for the
correct voltage and phase. DO NOT use this water
heater with any other voltage other than the voltage
specified on the rating plate. Failure to use the
correct voltage can cause problems that can result
in death, serious bodily injury or property damage.
CAUTION
DO NOT CONNECT THE WATER HEATER TO AN
IMPROPER SOURCE OF ELECTRICITY!
The appliance, when installed, must be electrically
grounded in accordance with the requirements of the
authority having jurisdiction or in the absence of such
requirements, with the latest edition of the National
Electrical Code, NFPA No. 70. When the appliance is
installed in Canada, it must conform to the CAE C22.1,
Canadian Electrical Code, Part 1 and/or local Electrical
Codes.
1. Use copper conductors only. All wiring between the
appliance and field installed devices shall be made with
copper wire suitable for at least 167°F (75°C)
temperature rating. If the wiring from an old water
heater installation was aluminum, replace the old wire
with copper wire.
2. The factory internal wiring is attached to a terminal
block inside the unit. The branch circuit is connected to
the terminal block through an opening provided on the
top of the water heater electrical access panel.
3. Line voltage wire exterior to the appliance must be
enclosed in approved conduit or approved metal clad
cable.
4. To avoid serious damage, DO NOT energize the
appliance until the system is full of water. Ensure that
all air is removed from the storage tank and piping before
beginning initial operation. Operation of a water heater
without a completely filled tank may result in serious
damage to the appliance and heating element burn out.
5. The water heater should be connected with a separate
grounded branch circuit with over current protection
and disconnect switch. The water heater should be
grounded in accordance with national and local codes. A
ground terminal is provided for ground connection only.
6. Provide the appliance with proper overload protection in
the branch circuit. It is suggested that the electrician size
the branch circuit at 125 percent of the heater ampere
rating and further increase wire size as necessary to
compensate for voltage drop in long runs. Branch circuit
voltage drop should not exceed 3% at the heater.
7. Voltage applied to the heater should not vary more than
+5% to -10% of the model and rating plate marking for
satisfactory operation.
8. A wiring diagram is provided with the water heater for
the electricians use.
CAUTION
Never turn on the electric power or attempt to use
this electric water heater unless it is completely full of
water. Water must flow from the hot water faucet
before turning electrical power "ON." Operation of a
water heater without a completely filled tank may
result in serious damage to the appliance and heating
element burn out.
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