Navien KDB-535GTD Installation Manual page 15

M e d i u m - s i z e d g a s b o i l e r
Precautions for piping installation
Considerations in common
A separable union connection or a nut connection shall be performed on the connection points.
The piping materials shall comply with the Korea Standard.
Do not use the metals with different electric potentials to install the piping in the
dedicated boiler for hot water supply, (For example, do not install the copper pipe in the
iron boiler.) which may cause galvanic corrosion, eventually generating rusty water.
Do not use the rubber hose for the faucet, when installing the piping.
Be sure to remove foreign objects inside the pipe prior to the piping installation.
Install the piping correctly for the water supply, the hot water supply, the heating, and
the drain.
The heating pipe shall be equipped with the heating strainer.
If the water supply pressure exceeds the allowable working pressure specified on the
name plate, be sure to install the depressurizing valve.
Proper measures shall be taken against a water leak through a water leak test for the
entire piping after completion of installation.
The entire pipelines, except for the gas pipe, shall be provided with heat insulation to
protect against getting frost, after completion of installation. (Especially, care shall
be taken for the water supply and the hot water pipes.)
Be sure to install the pressure release pipe for installation of the boiler. If it is
impossible to install the pressure release pipe, the safety valve, operating below the
maximum allowable working pressure of the boiler, shall be installed.
(The maximum allowable working pressure of the boiler is presented in the
"Specifications".)
Never install the valve and the check valve in the pipeline where the pressure release
pipe or the safety valve is installed.
Select the boiler expansion tank, if necessary, with a capacity suitable for the boiler
in use.
Do not use the water inlet for the purpose of the drain, and vice versa.
If the water is supplied to the boiler from the rooftop water tank, be sure to install the
water supply pipe in the auxiliary tank, separate from the rooftop water tank, for
water supply to the boiler.
Install the pipes as illustrated in the standard pipe drawing.
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