Noritz CB199-DV - Pressure Relief Valve Installation

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• External pressure relief valve must be installed. Observe the following. Failure to comply with the guidelines on installing
the pressure relief valve and discharge piping can result in personal injury, death or substantial property damage.
• DO NOT install a relief valve (DHW pipe line) with pressure higher than 150psi and relief valve (Heating pipe line) with
pressure higher than 30psi. This is the maximum allowable relief valve setting for the Combi Boiler.
• Approved ‘Pressure Relief Valve’ should be applied. An approved ASME HV Valve must be installed on the DHW supply
line for hydronic domestic hot water loop as close to the unit as possible.(Valve size 3/4" , maximum 150psi)
Refer to the gure below for more information on approved pressure relief valves.
(Install ‘pressure relief valve’, which can be purchased from local wholesaler.)
• No other valve should be installed between the pressure relief valve and Combi Boiler.
• Direct the discharge piping of the pressure relief valve so that hot water will not splash on anyone or any nearby
equipment. Attach the discharge line to the pressure relief valve and run the end of the line to within 6-12" (150-300mm)
of the oor.
• Isolation valve set should be installed, which can be purchased from local wholesaler.
4-7. Pressure Relief Valve
Pressure Relief Valve
Chapter4.–Installation
DHW Cold
Water
Supply
DHW
Supply
Heating
Return
Heating
Supply
Heating (3/4" 30psi)
Pressure Relief Valve
(Included Accessory)
DHW (3/4" 150psi)
Pressure Relief Valve
(Purchased Accessory)