Filling Water Heater; Electrical Connections - Rheem Marathon MR105/473185 Use & Care Manual

To prevent stress on the relief valve fitting, which may damage the tank,
support the drain pipe using metal strapping or similar method to an over-
head point. Refer to Figure 3 for typical strapping method.
NOTE: Local codes shall govern the installation of relief valves.
If the Temperature and Pressure Relief Valve should ever need replacing,
use only a valve specified by local codes, but not less than a new combina-
tion temperature and pressure relief valve, complying with the Standard for
Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply
Systems, ANSI Z21.22. The pressure rating of the relief valve must not
exceed 150 PSI, the maximum working pressure of the water heater as
marked on the rating plate. The BTUH Rating of the relief valve must not
be less than the input rating of the water heater as indicated on the rating
label located on front of the heater (1 watt = 3.412 BTUH).
5. DRAIN VALVE — The drain valve is factory installed. If required, to face
the drain valve outlet in a different direction, loosen the union hex nut, posi-
tion drain valve outlet as desired, and retighten union hex nut.
NOTE: DO NOT attempt to turn the drain valve without first loosen-
ing the union hex nut. Doing so could damage the water heater
beyond repair.
6. TO FILL WATER HEATER — Make certain drain valve is completely
closed. Open shut-off valve in cold water supply line. Open each hot water
faucet slowly to allow air to vent from the water heater and piping. A steady
flow of water from the hot water faucet(s) indicates a full water heater.
When the water heater is completely filled, close the faucet(s). Check all
plumbing work for leaks, and repair as necessary before proceeding with
installation.
!
WARNING
Tank MUST BE full of water before power is turned on. Heating ele-
ments WlLL BE DAMAGED if energized for even a short time while
tank is dry. The water heater's warranty does not cover damage or
failure resulting from operation with an empty or partially empty
tank. (Reference is made to the limited warranty for complete terms
and conditions.)
Figure 4 — Water heater junction box location.
7. ELECTRICAL CONNECTIONS — The water heater is completely wired to
the junction box inside jacket at top front of water heater (see Figure 4). An
opening for a l / " or 3 / " electrical fitting is provided for field wiring connec-
2 4
tions. A separate branch circuit with copper conductors, overcurrent protec-
tive device and suitable disconnecting means must be provided by a quali-
fied electrician. The voltage requirements and wattage load for the water
heater is specified on the rating plate on front of heater. Be certain that the
Installation
Cable and fittings approved for use as
BLACK
GREEN
Wire Nut
BLACK
Figure 5A— Water heater field wiring connections using metallic
Non - Metallic Sheathed Cable with sep-
Junction Box Cover
GREEN
Wire Nut
BLACK
Figure 5B— Water heater field wiring connections using non-
5
Metallic Conduit or Metal Sheathed
a grounding conductor.
Water Heater Junction Box
conduit or metallic sheathed cable approved for use
as a grounding conductor and installed with fittings
approved for the purpose.
arate grounding conductor.
BLACK
Water Heater Junction Box
metallic sheathed cable and separate grounding con-
ductor. Grounding conductor must be attached to
the ground terminal of water heater and the electrical
distribution panel.
Main Fuse or
Circuit Breaker Panel
RED
Wire Nut
RED
Main Fuse or
Circuit Breaker Panel
Grounding Conductor
(Bare or Green)
RED
Wire Nut
RED