Testing The Water System - Navien NFC-250/175H Installation Manual

3.4.1 Built-in Water Fill Connection
The Navien NFC-H boiler is equipped with an auto-
feeding water connection and motorized feeding
valve. Therefore, installation of additional system
water fill connection is not necessary in most cases.
See the following figure for an example of a water
fill installation using the built-in connection.
3.4.2 External Water Fill Connection
External water fill connection may be installed
on the system piping if it is required for specific
applications. See the following figure for an example
of external water fill installation on the system
piping.
Pressure Relief Valve
Air Separator
Pump
To System
Make-up
Water
Expansion Tank

3.5 Testing the Water System

Backflow
Preventer
Perform a fill test after installing the boiler's water
system to make sure that the system has been
Make-up
installed properly. Follow the instructions below to
Water
perform a fill test on the water system.
1. Fill the system only after ensuring that the water
Air Vent
External LWCO
From
System
WARNING
Ensure that the boiler is full of water before
firing the burner. Operating the unit without
completely filling it will damage the boiler. Such
damage is not covered by the warranty, and
may result in property damage, severe personal
injury, or death.
chemistry meets the requirements.
Contaminant Maximum Allowable Level
Total Hardness Up to 200 mg/l (12 grains/gallon)
Aluminum 0.05 to 0.2 mg/l
Chloride Up to 250 mg/l
Copper Up to 1.0 mg/l
Iron Up to 0.3 mg/l
Manganese Up to 0.05 mg/l
pH 6.5 to 8.5
Sulfate Up to 205 mg/l
Total Dissolved
Up to 500 mg/l
Solids (TDS)
Zinc Up to 5 mg/l
Chlorine Up to 4 mg/l
Proper maintenance of the boiler is
Note
required when water quality does
not meet standards. Damage caused
by poor water quality is not covered
under warranty. The table above shows
the maximum contaminant levels
allowed. If you suspect that your water
is contaminated in any way, discontinue
the use of the boiler and contact an
authorized technician or licensed
professional.
Installing the System Piping 33