Testing The Water System - Navien NHB Series Installation & Operation Manual

3.3.1 Make-up Water Connection
An external make-up water connection is required. The illustration
below shows an example of an external water supply connected to
the system piping.
Pump
To System
Make-up Water
Backflow Preventer
Pressure Reducing Valve
30 Installing the System Piping
Air Separator
Expansion Tank

3.4 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 leak 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 leak test on the water system.
1. Fill the system only after ensuring that the water chemistry
meets the requirements.
Contaminant
Total Hardness
From
Aluminum
System
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 water
heater 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