Warning
During operation, the relief valve may discharge large amounts of steam and/or hot water. To
reduce the potential for bodily injury and property damage, install a discharge line that:
Is connected from the valve outlet with no intervening valve and directed downward to a
safe point of discharge.
Allows complete drainage of both the valve and the discharge line.
Is independently supported and securely anchored, so as to avoid applied stress on the
valve.
Is as short and straight as possible.
Terminates freely to atmosphere where any discharge will be clearly visible and is at no
risk of freezing. terminates with a plain end which is not threaded.
Is constructed of a material suitable for exposure to temperatures of 375° F or greater.
Is, over its entire length, of a pipe size equal to or greater than that of the valve outlet (1"
NPT).
Do not cap, plug or obstruct the discharge pipe outlet.
3.8.1 General piping best practices
Primary/secondary piping, or the use of a hydraulic separator (such as the Caleffi 549 SEP4™ 4-in-1
Magnetic Hydraulic Separators) is recommended for maximum flexibility in multi-load applications. Piping
loads in parallel is also encouraged in systems that only have two loads, or when loads are operating
simultaneously. The extremely low pressure drop through the heat exchanger of the EX series affords more
flexible options unavailable in other designs.
Caution
Contact local water purveyors about the suitability of the supply for use in hydronic heating
systems.
If unsure about water quality, request testing and assessment (and treatment, if required) from a
local water treatment expert.
Alternatively, water or hydronic fluid of known quality can be brought to the site.
3.8.1 General piping best practices
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