Safety Relief Valve; Water System Layout - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

C230 ECO-A
5.1.6

Safety relief valve

A safety relief valve NB certified with V or HV & CRN symbols, must
be installed within 20 inches on the boiler supply piping without any
obstructions. The relief valve must not be smaller than 3/4 inch and
not larger than 4 inch. The pressure shall not exceed 10% above the
MAWP and must be of an automatic reset type. The valve opening
must be routed away so that no injury or damage to property will
result. Consult local codes. When replacing the valve, the relief
capacity must be more than the minimum relief capacity shown on the
boiler rating plate.
5.1.7

Water system layout

Fig. 5 Boiler water connections (minimum)
The above piping diagram illustrates the minimum boiler system
controls needed, the by-pass system is not necessary, but can be
used in multiple heating temperature circuits.
The boiler if installed above radiation (heating circuits below the
boiler) or as required by local codes or authorities having jurisdiction
must install a low water cut-off safety device, The LWCO is not a
standard scope of supply, but is available as an option. The boiler has
been approved and has found to be in compliance to the LWCO
protection, provided the factory pre-set high limit and flow
temperatures are not altered and the modulating controls are used
and no minimum flow is required as the Comfort master system will
monitor these conditions and reduce the boiler output, finally shutting
down until the flow conditions improve, As a result, the boiler is
virtually unaffected by low water flow. Although boiler flow and content
protection is provided, does not safeguard the entire heating system,
additional low water content and temperature safety control maybe
needed in certain jurisdictions.
5 Water-side connections
21