Installing the System Piping 19
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 plumbing inspector 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 device may be needed Consult your
.
local code requirements to determine if this device is required
.
Refer to the following illustration for a typical DHW piping example
for the boiler
.
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
.
●
VESTA recommends using unions and manual shut off valves
-
on the cold water inlet and DHW outlet
.
●
Keep the hot water piping system as short as possible to deliver
,
hot water to the fixtures more quickly
.
●
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
.
DHW SUPPLY
Cold Water Inlet
Pressure Relief Valve
DHW Supply
Cold Water Inlet
Pressure Relief Valve
CAUTION
The boiler, when usde in conjunction with a refrigeration
system, must be installed so that the chilled medium is
piped in parallel with the heating boiler. Appropriate valves
must be used to prevent the chilled medium from entering
the boiler
If the boiler is connected to heating coils located in air handling
units where they can be exposed to refrigerated air, use flow
control valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle
