QuickDraw
Storage and Semi-instantaneous
Boiler Water Heater
8
PV500-26 05/13
4.2 Boiler Water Piping
WARNING: All system piping to the heat exchanger plumbing must be adequately supported. Failure to
provide adequate support will result in excessive loads on the heat exchanger connections that can cause
hot water or steam discharge resulting in property damage, scalding and personal injury or loss of life.
This appliance will perform in accordance with the boiler water and domestic water temperatures and flows to which
it is connected. To obtain the desired performance, it must be installed to operate with the temperature and flow
conditions specified when selecting the appliance. The boiler water piping must be appropriately sized and include a
strainer, isolation valves, pressure gauges, drain valve, and over pressure protection where required. The domestic
water piping must also be appropriately sized and include isolation valves, drain valve, temperature and pressure
relief valve and expansion tank or other means of expansion control.
Boiler water supply piping should be sized to deliver sufficient hot water to the appliance without excessive pressure
drop. A heat trap of at least 3x pipe diameters must be used for the boiler water supply piping as depicted in the
above typical piping arrangement.
When larger sized boiler water supply and return piping is not furnished by PVI, the installation must comply with the
typical piping installation diagram shown below. It is important that a minimum of 3x pipe diameters heat trap be
installed on the boiler water supply line to achieve proper performance of the heat exchanger.
