Water Pressure; Safety Valve - Absolute ABS-1500 Installation And Operating Manual

4.6.1 Water pressure

The boiler is suitable for a maximum working pressure of 160 psi [10.8 bar], the system pressure shall be at least 12
psi [0.8 bar]

4.6.2 Safety valve

A safety relief valve NB certified with V or HV symbol as supplied must be installed on the boiler supply piping without
any obstructions. Do not install any valve or fitting that will restrict the relief valve. The relief must be not smaller
than ¾" and no larger than 2 inch NPT. 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 to persons or damage to property will
result. Consult local codes. When replacing this safety relief valve, the relief capacity must be > than the minimum
relief capacity as listed on the rating plate. Please see page # 19 for pressure relief valve selection, based on system
pressure and input rating of boiler.
WARNING
Reducing couplings or other restrictions are not permitted in the discharge pipe. Ensure the discharge pipe faces
down and into a floor drain where ever possible.
Absolute Boilers ABS 1500-2000-2500-3000-4000
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