Navien KDB-535GTD Installation Manual page 18

M e d i u m - s i z e d g a s b o i l e r
Precautions for the piping installation for the
dedicated boiler for hot water supply
Model no.: KDB-535, 735 GTG
KDB-1035, 1535, 2035 GPG
Open piping system
- Be sure to comply with the instructions presented in the "Considerations in common".
- Never supply the water with a pressure higher than the maximum allowable working
pressure of the boiler specified on the name plate, nor connect the water pipe directly
for the piping.
- Be sure to use the coated piping material and the stainless piping material for the
dedicated boiler for hot water supply.
- The pressure release pipe shall be installed to exceed 25A.
- The expansion tank shall be installed at least 1.5m above the maximum height of the
hot water pipe in case of the upward type, and at least 1.5m above the top of the boiler
in case of the downward type.
- When installing the hot water storage tank, connect the hot water outlet to lower part (inlet)
of the hot water tank, and the hot water inlet to the upper part (outlet) of the hot water tank.
- Use the connection wire to the circulation pump of the boiler to install the hot water
storage tank separately.
- If the water pressure is too low, attach an additional pump to the hot water outlet.
- When attaching an additional pump, be sure to install the pressure switch (S/W) and the
check valve. (Do not connect them to the wire of the circulation pump of the boiler.)
Closed piping system
"
- Be sure to comply with the instructions presented in the "Considerations in common".
- Be sure to install the strainer, the depressurizing valve, the check valve, the safety valve,
and the closed expansion tank, in order to directly connect the boiler to the water pipe.
- Be sure to use the coated piping material and the stainless piping material for the dedicated
boiler for hot water supply.
- Be sure to install the depressurizing valve and the check valve in the water supply pipe.
- Install the air vent on top of the hot water supply pipe to facilitate air vent.
- Be sure to install the safety valve.
- Be sure to install the closed expansion tank with an appropriate capacity.
- When installing the hot water storage tank, connect the hot water outlet to lower part (inlet)
of the hot water tank, and the hot water inlet to the upper part (outlet) of the hot water tank.
- Use the connection wire to the circulation pump of the boiler, in order to install the hot
water storage tank separately.
- If the water pressure is too low, attach an additional pump to the hot water outlet.
- When attaching an additional pump, be sure to install the pressure switch (S/W) and the
check valve. (Do not connect them to the wire of the circulation pump of the boiler.)
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