Plumbing And Water Connection Guidel Ines - Navien CR-180 Installation Manual

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Pl umbing:

Plumbing and Water Connection Guidel ines

Pipe Sizing
� The water fittings on the Navien water heater are 3A"N PT.
� Although Navien's water connections are %", if the installation site has only W' plumbing
throughout the building, it is NOT necessary to upsize the water lines to %" when installing a
single unit;
� When installing multiple units to supply higher volumes of hot water either in residential (multi­
head shower systems for example) applications or in commercial applications, the number of
Navien water heaters required and the header pipe sizing needs to be properly sized to meet
the total hot water demand. A water pressure above 4 0 psi is recommended for each water
heater for proper operation of the unit. Consult the Navien website or call for further information
on sizing such applications.
Water Piping G uidelines
� All pipes, pipe fitti ngs, valves and other components, including solder, must be approved
for use in potable water systems;
� The use of unions and manual shut off valves on both the cold water inlet and hot water
outlet are recommended ;
� The longer the piping, the longer it takes to get hot water to the fixtu res. Make the hot
water piping system as short as possible;
� To conserve water and energy, insulate all water piping especially the hot and
recircu lation water lines. DO NOT cover the drain or pressu re relief valve;
After the water heater has been installed, be sure to clean the mesh filter located within
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the cold inlet and then test the unit. The fi lter is there to prevent debris from entering
you r water heater. This will need to be cleaned periodically to maintain optimum flow; See
"drai ning the unit" and "cleaning the in let filter" procedu res in the maintenance section of
the operating manual for instructions on these two procedures.
Space Heating
� Piping and components connected to the water heater for the space heating application
shall be suitable for use with potable water.
� The effect that toxic chem icals, such as used for boiler treatment, shall not be introduced
into the potable water used for space heating.
� The effect that a water heater which wi ll be used to supply potable water shall not be
connected to any heati ng system or component(s) previously used with a nonpotable
water heating appliance.
� I nstructions that when the system requires water for space heating at temperatu res higher
than req uired for other uses, a means such as a mixing valve shall be installed to temper
the water for those uses in order to reduce the risk of scalding potential. These instructions
shall include a piping diag ram(s) for a typical installation.
CAUTION
This water heater must only be used with the followi ng water supply system conditions
� With clean , potable water free of corrosive chemicals, sand , dirt, or other contaminates.
� With inlet water temperatu res above 3 2
Free of lime and scale deposits.
�
"'-
° °
C ) , but not exceeding 1 4 0
F ( 0
° °
F (6 0
C ).
�