Testing The Water System - Navien NFC-175 Installation & Operation Manual

3.4.1 Built-in Water Fill Connection
The Navien NFC 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
Backflow
Preventer
Make-up
Water
Air Vent
External LWCO
From
System

3.5 Testing the Water 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.
Perform a fill test after installing the boiler's water system to
make sure that the system has been installed properly. Follow the
instructions below to perform a fill test on the water system.
1. Fill the system only after ensuring that the water chemistry
meets the requirements.
Contaminant
Total Hardness
Aluminum
Chloride
Copper
Iron
Manganese
pH
Sulfate
Total Dissolved Solids (TDS)
Zinc
Chlorine
Proper maintenance of the boiler is required when
Note
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.
Maximum Allowable Level
Up to 200 mg/l (12 grains/gallon)
0.05 to 0.2 mg/l
Up to 250 mg/l
Up to 1.0 mg/l
Up to 0.3 mg/l
Up to 0.05 mg/l
6.5 to 8.5
Up to 205 mg/l
Up to 500 mg/l
Up to 5 mg/l
Up to 4 mg/l
Installing the System Piping 29