9
If you lack the necessary skills required to properly install the
electrical wiring to this water heater, do not proceed but have a
quali
fi
ed electrician perform the installation.
When making the electrical connections, always make sure:
•
The electrical service provides 240 VAC to the water heater
for proper operation. DO NOT use 208 VAC.
•
Wire sizes and connections comply with all applicable
codes or in the absence of local or state codes follow
NFPA-70, the National Electrical Code-current edition.
•
Wiring enclosed in approved conduit (if required by local
codes).
•
The water heater and electrical supply are properly
grounded.
•
The electrical supply has the proper overload fuse or
breaker protection.
Always reference the wiring diagram located on the water
heater for the correct electrical connections and
connect the
electrical supply to the water heater in accordance with local
utility requirements and codes.
When installing the electrical wiring to the water heater:
1. Although this water heater is equipped with “Dry Fire”
protection, be sure tank is completely filled with water, and
all air is purged from the tank before making any electrical
connections. See “Draining and Flushing Section”.
2. Turn off power to the electrical wiring for the water heater at
the circuit breaker/fuse box.
3. If metal conduit is used for the grounding conductor:
A. The grounding electrode conductor shall be of copper,
aluminum, or copperclad aluminum. The material shall
be of one continuous length without a splice or joint.
B. Rigid metal conduit, intermediate metal conduit,
or electrical, metallic tubing may be used for the
grounding means if conduit or tubing is terminated in
fittings approved for grounding.
C. Flexible metal conduit or flexible metallic tubing shall
be permitted for grounding if all the following conditions
are met:
• The length in any ground return path does not
exceed 6 feet.
• The circuit conductors contained therein are
protected by overcurrent devices rated at 30 amperes.
Figure 10
Junction Box
Power Supply
Connector
Black Wire
Red Wire
Green
Ground
Wire
1/2” Conduit
Opening
Green Ground Screw
• The conduit or tubing is terminated in fittings
approved for grounding.
For complete grounding details and all allowable exceptions,
refer to the current edition of the National Electrical Code NFPA
70.
4. A standard 1/2" conduit opening has been made in the
water heater junction box for the conduit connections.
5. Use wire nuts and connect the power supply wiring to the
wires inside the water heater's junction box (Figure 10).
6. The water heater must be electrically "grounded" by the
installer. A green ground screw has been provided on the
water heater's junction box. Connect ground wire to this
location.
7. Replace the wiring junction box cover using the screw
provided.
8. Turn on electrical power to the water heater.
9. Press the Efficiency button to set the operating mode.
NOTE:
The water heater will conduct a system diagnostic
(approximately 8 minutes) prior to returning to operation.
10. Once the diagnostic sequence has finished, the fan should
turn on.
NOTE:
The heat pump’s fan will not turn on if the
incoming water temperature is less than 59°F / 15
°C
and/
or the ambient air temperature is above 120°F / 15
°C
or below 45°F / 7.2
°C
. Should the internal diagnostics
detect a problem with the heat pump, an error code will be
displayed.
11. Set the desired operational mode. For typical installations,
the Hybrid Mode offers the best combination of efficiency
and hot water delivery. For detailed descriptions of all
operational modes see “Adjusting the User Interface
Module/Operational Modes” section.
Insulation Blankets
The use of an insulation blanket on this water heater is not
needed or recommended. The purpose of an insulation
blanket is to reduce the standby heat loss encountered with
storage tank heaters. Your water heater meets or exceeds
the National Appliance Energy Conservation Act standards
with respect to insulation and standby loss requirements,
making an insulation blanket unnecessary. If an insulation
blanket is installed, make sure it does not block airflow into
or out of the compressor assembly.
