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33
ELECTRICAL WIRING
If you lack the necessary skills required to properly install the
electrical wiring to this water heater, do not proceed but have a
qualified electrician perform the installation. Refer to the Power
Supply section on Page 18 for additional requirements.
When making the electrical connections, always make sure:
• The voltage and frequency must correspond to that specified
on the water heater data plate on the front of the water heater.
• The electrical supply has the proper overload fuse or breaker
protection. The heater draws less than 7 amps.
• Wire sizes, connections and conduits comply with all applicable
codes.
• The water heater and electrical supply are properly grounded.
• This water heater must be “hard-wired” do not use an ex tension
cord to supply electrical power to this water heater.
NOTE: The wiring diagram can be found in Figure 49 on page 57.
Always reference the wiring diagram(s) for the correct electrical
connections.
When installing the electrical wiring to the water heater:
1. Shut off the power at the electrical service box.
2. Loosen the screws securing the access panel to the electrical
compartment. (The electrical wiring diagram for all models can
be found on the inside of the access panel at the base of the
water heater. Set the access panel aside.
3. Connect the electrical supply to the water heater in accordance
with local utility requirements and codes. Use only a dedicated
electrical circuit containing a properly sized fuse or circuit
breaker. Maximum overload protection should not exceed 15
amperes.
4. Connect this circuit (directly from the electrical service box) to
an electrical disconnect switch.
5. Ground the water heater by connecting the electrical service
ground wire to the green ground wire (provided).
NOTE: The power supply to this water heater must be properly
polarized, [120 volts from the hot lead (black) to ground and 0 volts
from the neutral lead (white) to ground] otherwise, the unit will not
operate.
6.
After making all electrical connections, completely fill the
tank with water and check all connections for leaks. Open the
nearest hot water faucet and let it run for 3 minutes to purge the
water lines of air and sediment and to ensure complete filling
of the tank. The electrical power may then be turned on. See
Page 44 for the complete Start Up instructions.
ENABLE/DISABLE CIRCUIT
(For Building Management Systems)
The water heaters covered in this manual are equipped with
an enable/disable circuit for use with field supplied external
supervisory controls such as time clocks or Building Management
Systems. The enable/disable circuit may be used to disable
heating operation during periods when the building is unoccupied
or there is no demand for hotwater.
To use the enable/disable circuit it must first be activated by
selecting the “Use External Enable” from the UIM. Field supplied
wiring is then installed between the water heater’s CCB and a
set of “dry contacts” (no voltage or load) on the field supplied
external control.
NOTE: The water heater’s enable/disable circuit is a switching
circuit only: Do not apply external voltage or connect any load
(IE: relay coil) to this circuit. This will damage the CCB circuit
board and is not covered under the limited warranty.
CONNECTING AN EXTERNAL SUPERVISORY CONTROL
The enable/disable circuit is accessed from the CCB’s J17 plug
inside the CCB enclosure; see Figure 3 on page 12 to locate the
CCB enclosure and Figure 48 on page 56 for the CCB layout.
Install field wiring to the enable/disable circuit:
1. Turn off power at the water heater’s enable/disable switch
and the breaker that supplies power to the water heater.
2. Locate the CCB enclosure.
3. Carefully remove the Temperature Probe connectors and
CCB enclosure cover.
4. Locate pins 1 and 2 on the CCB J17 plug. See Figure 48 on
page 56.
5. Connect the two field supplied control wires to pins 1 and 2
on the CCB J17 plug.
6. Thread the control wires out of the CCB enclosure with the
other wiring and carefully replace the CCB enclosure cover.
Ensure all wiring is routed through the intended area provided
for strain relief. Ensure no wiring is being pinched.
7. Reinstall the CCB enclosure cover.
8. Route the control wires inside the junction box on the top
of the water heater; see Figure 3 on page 12 to locate the
junction box. Use an available knock-out to route the wires
inside the junction box.
9. Install field supplied control wiring and conduit as required
by national and local codes between the water heater’s
junction box and the external supervisory control. Connect
the wiring from the external control to the control wires inside
the junction box using wire nuts and electrical tape.
10. Connect the control wiring to a set of dry contacts on the
external control. Follow the control manufacturer’s instructions
for making connections.
11. Restore power to the water heater.
12. From the water heaters UIM “Heater Information Screen”
select “Use External Enable” and change to “Yes”. See
Figure 3 on page 12 to locate the UIM.
NOTE: Whenever the external control opens the set of dry
contacts used, water heating operation will be disabled.
Whenever the external control closes the set of dry contacts
used, water heating operation will be enabled. A diagonal line and
circle appears over the thermometer icon on the UIM when water
heating operation is disabled. See the Status Icons descriptions
in Table 12 on page 37.
NOTE: Ensure the water heater is protected from freezing
temperatures when water heating operation is disabled. Damage
to the water heater caused by freezing temperatures is not
covered under the limited warranty.
WATER LINE CONNECTIONS
The water piping installation must conform to these instructions and
to all local and national code authority having jurisdiction. Good
practice requires that all heavy piping be supported.
Read and observe all requirements in the following sections before
installation of the water piping begins:
1. Mixing Valves on page 18.
2. Dishwashing Machines on page 19.
3. Temperature-Pressure Relief Valve on page 20.
4. Closed Systems and Thermal Expansion on page 19.
WATER PIPING DIAGRAMS
This manual provides detailed water piping diagrams for typical
methods of application for the water heaters, see Piping Diagrams
beginning on Page 59.
The water heater may be installed by itself, or with a separate storage
tank. When used with a separate storage tank, the circulation may
be either by gravity or by means of a circulating pump. When a