User Guide

Installation
The Caleffi NA573 replenishment water treatment filling unit must be installed in accordance with the
diagrams contained in this instruction sheet taking into account all the applicable local codes and
regualtions.
Before installing a Caleffi NA573 filling unit, the system must be thoroughly flushed to remove
impurities or any debris which may have accumulated during installation. Failure to remove dirt or
debris may affect system performance and the manufacturer's guarantee. In addition, the system
must be filled with demineralized water with total dissolved solids (TDS) less than 30 ppm. This can
be accomplished with the Caleffi NA570 series HYDROFILL™ portable water treatment filling unit.
Because the NA573 filling unit is designed for system replenishment with a 1 gpm maximum flow
rate for optimal demineraliztion, it can not be used for filling the system.
Note: The Caleffi NA570 HYDROFILL™ portable water treatment filling unit's built in TDS meter
will indicate the TDS level during filling operation. If this is not used for filling the system, the Caleffi
NA575002 TDS tester kit can be used to verifty the system fluid TDS level is less than 30 ppm before
operation.
The Caleffi NA573 filling unit must be installed horizontally, following the flow direction indicated by
the arrow on the filter cartridge head, and also as indicated on the AutoFill™ and back flow preventer.
The Caleffi NA573 filling unit comes pre-assembled and pressure tested. Make sure that you have
connecting piping and proper connections to accomodate the assembled unit installation with 19
inches end-to-end length.
The Caleffi NA573 filling unit must be installed in an accessible location to facilitate testing and
servicing. The back flow preventer just be installed with the vent port connected via an air gap to a
discharge line, in accordance with the local plumbing code requirements and keeping a minimum
distance of 12" from the floor. Do not install where the discharge can cause water damage.
The NA573 replenishment water treatment filling unit must not be installed upside down.