Pipe Demensions And Water Pressure - Navien NCB-24LSWE Installation & Operation Manual

a
b
a. From the boiler directly into an external drain
b. From the boiler, through a neutralizing agent, and then
into an external drain
If you choose this option, the neutralizing agent
Note
must be replaced periodically. Depletion of
the neutralizing agent will vary, based on the
usage rate of the boiler. During the first year of
operation, the neutralizer should be checked
every few months for depletion and replaced as
needed.
c. From the boiler into a laundry tub.
The bottom of the boiler must be higher than
Note
the top of the laundry tub to use this option. The
condensate line must have a negative slope to
drain properly.
d. From the boiler into a condensate pump, and then into a
laundry tub.
A pump can be used when there is a long
Note
distance between the boiler and the laundry tub
or when the bottom of the boiler is lower than the
top of the laundry tub.
c
d
To connect the condensate drain:
1. Connect a drain line to the 13 mm fitting at the bottom of
the boiler.
Use only corrosion-resistant material for the drain line, such
as PVC or CPVC. Do not reduce the size of this fitting or the
drain line to less than 13 mm.
2. Place the free end of the drain line into an appropriate drain.
3. If you are using a condensate pump, ensure that the pump
allows for up to 3.78 LPH of drainage for each boiler in the
system.
4. If you are not using a condensate pump, ensure that the
drain line is pitched downward at a minimum slope of 6 mm
per 30 cm.

3.4 Pipe Demensions and Water Pressure

The requirements recommended for the pipe dimensions and
water pressure are as follows:
The connection diameter for the domestic cold water inlet
●
must be at least Ø15 mm.
If a shut-off valve is fitted at the domestic cold water inlet, it
●
must have a safety valve incorporated, calibrated to 9 bar.
For DHW production installation, the inlet pressure must be
●
over 0.5 bar.
For hot water supply to the second floor of a building, the
●
mnimum pressure required is 1.0 bar.
The pipe diameter is not determined by the boiler connection
●
but must be calculated in accordance with its length and
consequent pressure drop.
Installing the System Piping 25