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D. PIPING DIAGRAM
Figure 16 – DHW Piping
Figure 17 – Piping with Recirculation
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 18). 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
Figure 18 – Relief Valve Details
WHL-004 REV. 12.17.14
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