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1. Fill the system only after ensuring that the water
chemistry meets the requirements.
Contaminant
Maximum Allowable Level
Up to 200 mg/l
Total Hardness
(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.
2. Close the manual and automatic air vents and
the boiler drain valve.
3. Fill the boiler to the correct system pressure. The
correct pressure will vary with each application.
The typical cold water fill pressure for a
residential system is 12 psi. The pressure will rise
when the boiler is turned on and the system
water temperature increases. The operating
pressure must never exceed the relief valve
pressure setting.
4. At initial fill and during boiler start-up and
testing, check the system thoroughly for leaks.
Repair any leaks before proceeding further.
NOTICE
Eliminate all system leaks. The continual
introduction of fresh makeup water will reduce
boiler life. Minerals can build up in the heat
exchanger, reducing heat transfer, overheating
the heat exchanger and causing heat exchanger
failure.
The system may have residual substances that
could affect water chemistry. After the system has
been filled and leak tested, verify that water pH and
chlorine concentrations are within the acceptable
range by performing sample testing.
WARNING
Before operating the boiler for the first time,
ensure that the boiler system is filled with water.
Purge the air inside the system to avoid damage
to the boiler.
3.5 Considerations for System
Applications
Read and follow the guidelines listed below when
installing system piping for the Navien NHB-H boiler:
System application drawings are intended to
●
explain the system piping concept only.
For the upstream side of all pumps, use straight
●
pipes with a minimum inside diameter of
/
in (12 mm).
1
2
Provide a system expansion tank following the
●
guidelines on page 18.
System installations must comply with all local
●
codes.
Air Removal
The boiler and system piping layout must be
configured to promote the removal of air from the
water. Air vents and bleeders must be strategically
placed throughout the system to aid in purging the
air from the system during commissioning of the
boiler. The system must also employ the use of a
strategically located air removal device, such as an
air eliminator designed to remove the air from the
water as it flows through the system.
Installing the System Piping
27
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