Navien NCB-190/060H, Руководство по установке и эксплуатации

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25 Installing the System Piping
Cold Water
Supply
DHW
Supply
When installing the DHW system, follow these
guidelines:
●
Use only pipes, fittings, valves, and other
components (such as solder), that are approved
for use in potable water systems.
●
Tighten the connection valves with care to avoid
damage.
●
Navien recommends using unions and manual
shut-off valves on domestic cold and domestic
hot.
●
Keep the hot water piping system as short as
possible, to deliver hot water to the fixtures more
quickly.
●
Recirculation controls are included with the
boiler for use of an optional external recirculation
system.
●
To conserve water and energy, insulate the DHW
supply and DHW recirculation lines (if applicable).
Do not cover the drains or pressure relief valves.
●
After installing the boiler, clean the cold water
inlet filter. Then, test the boiler for proper DHW
supply and inspect for leaks. Instruct the boiler
owner that the filter must be cleaned periodically
to maintain proper DHW flow.
When installing pressure relief valve, follow these
guidelines:
●
Ensure that the valve’s discharge capacity is equal
to or greater than the maximum pressure rating
of the boilers DHW system.
●
Ensure that the maximum BTU/H rating on the
pressure relief valve is equal to or greater than the
maximum input BTU/H rating of the boiler.
●
Direct the discharge piping of the pressure
relief valve so that hot water does not splash on
operator, or any nearby equipment.
●
Attach the discharge line to the pressure relief
valve and run the end of the line to within 6-12 in
(150 300 mm) of the floor.
●
Ensure that the discharge line allows for free and
complete drainage without restriction. Do not
install a reducing coupling or other restrictions on
the discharge line.
●
If the relief valve discharges periodically, this may
be due to thermal expansion in a closed water
supply system. Contact the water supplier or local
plumber on how to correct the situation. Do not
plug the relief valve.
3.2.3 DHW System Piping
CAUTION
To comply with ASME or CRN requirements,
an additional high temperature limitation
appliance may be needed. Consult your
local code requirements to determine if this
appliance is required.
Refer to the following illustration for a typical DHW
piping example for the boiler.