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LP-505 REV. 4.29.14
E. PRESSURE RELIEF VALVE
An external pressure relief valve must be installed on this water heater. When
installing, observe the following guidelines. Failure to comply with these guidelines
can result in substantial property damage, personal injury, or death.
This water heater must be provided with an approved 150 psi, ¾” ASME HV Valve
that must be installed on the DHW outlet line (See Figure 19). The 150 psi Pressure
Relief Valve must be installed on the DHW supply line to ensure a compliant
installation and safe operation.
This water heater has a high-temperature shut-off switch built in as a standard safety
feature. Therefore, a “pressure only” relief valve is required. DO NOT operate this
water heater before the supplied pressure relief valve is installed with sufficient
relieving capacity in accordance with the ASME rating plate on the water heater.
Pressure relief valves must be installed as close to the water heater as possible. No
other valves should be placed between the pressure relief valve and the appliance.
DO NOT install a relief valve with a pressure rating greater than 150 psi. This is the
maximum allowable relief valve setting for this water heater.
After installing the relief valve and filling and pressurizing the system, test the
operation of the valve by lifting the lever. Make sure the valve discharges freely. If
the valve fails to operate correctly, replace it with a new relief valve. Ensure that the
maximum BTU/H rating on the pressure relief valve is equal to or greater than the
maximum input BTU/H rating of the combination water heater.
To avoid water damage or scalding due to relief valve operation:
Discharge line must be connected to relief valve outlet and run to a safe place of disposal. Terminate the discharge line in a
manner that will prevent possibility of severe burns or property damage should the relief valve discharge.
Discharge line must be as short as possible and the same size as the valve discharge connection throughout its entire length.
Discharge line must pitch downward from the valve and terminate at least 6” above the floor drain, making discharge clearly
visible.
Discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of 375
o
F or greater.
Do not pipe discharge to any location where freezing could occur.
No shutoff valve may be installed between the relief valve and water heater or in the discharge line. Do not plug or place any
obstruction in the discharge line.
Test the operation of the relief valve after filling and pressurizing the system by lifting the lever. Make sure the valve
discharges freely. If the valve fails to operate correctly, replace it with a new relief valve.
Test relief valve at least once annually to ensure the waterway is clear. If valve does not operate, turn the water heater “off”
and call a plumber immediately.
Take care whenever operating relief valve to avoid scalding injury or property damage.
For water heaters installed with only a pressure relief valve, the separate storage vessel must have a temperature and
pressure relief valve installed. This relief valve shall comply with Relief Valves for Hot Water Supply Systems, ANSI Z21.22
CSA4.4.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
PART 9 – CONNECT ELECTRICAL POWER / INITIAL STARTUP
Install wiring and electrically ground water heater in accordance with the authority having jurisdiction or, in the absence of such an
authority, follow the National Electrical Code, NFPA 70, and/or CSA C22.1 Electrical Code-Part 1 in Canada. Failure to follow all
applicable local, state, and national regulations, mandates, and building supply codes for guidelines to install the electrical power supply
could result in property damage, serious personal injury, or death.
ELECTRICAL SHOCK HAZARD – To ensure safety, turn off electrical power supply at service entrance panel before making any
electrical connections to avoid possible electric shock hazard. Failure to do so could result in property damage, serious personal injury,
or death.
Figure 19 – Relief Valve Details
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