Westinghouse WBRCNG140F Installation Manual download pdf (Page 33)

WHL-015 REV. 12.17.14

SYSTEM TEMPERATURE CHART

Min. Flow (GPM)

Head (ft)

Min. Flow (GPM)

Head (ft)

Min. Flow (GPM)

Head (ft)

12.9

10.3

8.6

Table 15 – System Temperature Chart

E. PRESSURE RELIEF VALVE

An external pressure relief valve must be installed on this appliance. When installing, observe the following guidelines. Failure to

comply with these guidelines can result in substantial property damage, personal injury, or death.

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.

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.

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. DO NOT install a CH pipe line relief valve with a pressure rating

greater than 30 psi, or a DHW relief valve with a pressure rating greater than

150 psi. These are the maximum allowable relief valve settings for this

appliance. A DHW pressure relief valve is not included with the appliance, and is to be field supplied and installed.

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

Figure 21 – Relief Valve Details

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Westinghouse WBRCNG140F Installation Manual Page 33