Eternal GU125T, Installation And Operation Manual

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28
Temperature and Pressure Relief Valve
Troubleshooting Thermal Expansion
If a water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold water
supply line, then a thermal expansion tank is required, Contact the water supplier or local plumbing inspector on how to
control this situation.
The following 3/4", maximum 150psi valves are approved by CSA for use with GU125T / GU160T :
- WATTS 100XL- 4
The temperature-pressure relief valve should be manually opened once a year.
No one should be in front of or around the outlet of the temperature-pressure relief valve discharge line when in use.
If after manually opening the valve, it fails to completely reset and continues to release water, immediately close the
cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve
with a new one.
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CAUTION
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Installation Codes:
Follow the requirements of the local authority having jurisdiction. In the absence of such requirements, follow the
latest edition of the National Electrical Code ANSI/NFPA 70.
Do not plug electrical power to the unit until all plumbing and gas piping is complete and the water heater has
been
 lled with water.
The use of a surge protector is recommended to protect from power surges.
Do not connect 220-240V AC to this unit. It will damage the water heater and void the warranty.
Do not disconnect the power supply when the unit is in normal operation.
A battery back-up may be used to supply hot water during periods of power outages. We recommend a computer-
grade UPS (uninterruptable power supply; true sine wave) with at least 600VA
rating for extended coverage.
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Grounding and Surges
A means for switching off the 120 VAC power supply must be provided.
Wire the heater exactly as shown in the wiring diagram
in the page of 37 .
Check all new water piping for leaks. Repair as needed.
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The water heater requires an electrical power supply of 120 VAC/60Hz, and it must be properly grounded to
function.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
CAUTION
! !
The water heater must be electrically grounded.
Do not rely on the gas or water piping to ground the metal parts of the water heater, because plastic pipe may
isolate the water heater electrically. Service and maintenance personnel who work on or around the water
heater may be standing on wet
 oors, and could be electrocuted by an ungrounded water heater.
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WARNING
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All units come with a factory installed 3-pronged power (grounded) plug. It is required to run a dedicated
electrical line to the water heater to prevent electrical interference.
WARNING
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Electrical Connection