Ch And Dhw Pressure Relief Valves; Part 9 - Connect Electrical Power / Initial Startup - Westinghouse WBRCNG140W Installation Manual

D. CH AND DHW PRESSURE RELIEF VALVES
An external pressure relief valve must be installed on this appliance for both the CH and
DHW loops. When installing, observe the following guidelines. Pressure relief valves
must be installed as close to the appliance as possible. No other valves should be
placed between the pressure relief valve and the appliance. Failure to comply with these
guidelines can result in substantial property damage, personal injury, or death.
This appliance 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
appliance before the supplied pressure relief valve is installed with sufficient relieving
capacity in accordance with the ASME rating plate on the appliance.
CH Loop
This appliance is provided with a CH pressure relief valve that complies with the
ANSI/ASME Appliance and Pressure Vessel Code, Section IV (Heating Appliances).
The included 30 psi CH Pressure Relief Valve must be installed on the CH supply line to
ensure a compliant installation and safe operation. Westinghouse has supplied a ¾" X
1" bushing to aid installation of the CH Pressure Relief Valve. The valve is meant to be
field installed. DO NOT install a CH pipe line relief valve with a pressure rating greater
than 30 psi. This is the maximum allowable CH relief valve setting for this appliance.
DHW Loop
This appliance must be provided with a DHW pressure relief valve that complies with local codes, but not less than valves certified as
meeting the requirements of Relief Valves for Hot Water Supply Systems, ANSI Z21.22 CSA4.4 by a nationally recognized lab that
maintains periodic inspection of production listed equipment. A DHW pressure relief valve is not included with the appliance, and is to
be field supplied and installed. DO NOT install a DHW relief valve with a pressure rating greater than 150 psi. This is the maximum
allowable DHW relief valve setting for this appliance.
After installing the relief valves and filling and pressurizing the system, test the operation of the valves by lifting the levers. Make sure
the valves discharge freely. If a 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 appliance.
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.

The relief line cannot be in contact with any live electrical parts.

Discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of 375

Do not pipe discharge to any location where freezing could occur.

No shutoff valve may be installed between the relief valve and appliance 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 appliance "off" and
call a plumber immediately.

Take care whenever operating relief valve to avoid scalding injury or property damage.

For appliances 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 appliance 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.
Figure 23 – Relief Valve Details
o
F or greater.
WHL-012 REV. 12.17.14
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