And Dhw Pressure Relief Valves - NTI FTVN085 Installation Start-Up Maintenance

Part 4 - Water Piping Part 1 - General Safety Information
F. CH and DHW Pressure Relief Valves
This boiler has a high-temperature shut-off switch built in as a standard
safety feature. Therefore, a "pressure only" relief valve is required.
DO NOT operate this appliance before the supplied pressure relief
valve is installed with sufficient relieving capacity in accordance with
the ASME rating plate on the appliance.
WARNING
The pressure relief valve provided with the boiler must be installed as
detailed in Figure 12. No other valves should be placed between the
pressure relief valve and the appliance. Failure to comply with these
guidelines can result in substantial property damage, personal injury,
or death.
CH Loop
This boiler is provided with a CH pressure relief valve that complies with
the ANSI/ASME Boiler and Pressure Vessel Code, Section IV (Heating
Boilers). The included 30 psi CH Pressure Relief Valve must be installed
at the top of the boiler, using the included pipe adapter and grommet,
as illustrated below.
DO NOT install a relief valve with a pressure rating in excess of 50 psi
- the maximum allowable operating pressure of the boiler. The relief
valve capacity must exceed the BTU/H input capacity of the boiler.
Install the factory provided relief valve in the fitting on top of the boiler.
CAUTION
Use two wrenches when installing the relief valve. Use one wrench
to prevent the fitting from turning. Failure to prevent the fitting
from turning could cause damage to boiler components.
Figure 12 - Connect CH Pressure Relief Valve
DHW Loop (Combi Models)
The DHW piping must be provided with a DHW pressure relief valve that
complies with local codes, but not less than valves certified as meeting
the requirements of Relief Valves for Hot Water Supply Systems, ANSI
Z21.22 / CSA4.4 by a nationally recognized lab that maintains periodic
inspection of production listed equipment.
A DHW pressure relief valve is not included with the boiler, and is to be
field supplied and installed in the DHW piping. DO NOT install a DHW
relief valve with a pressure rating greater than 150 psi - the maximum
allowable operating pressure of the boiler's DHW circuit.
After installing the relief valves and filling and pressurizing the system,
test the operation of the valves by lifting the levers.
Make sure the valves discharge freely. If a valve fails to operate correctly,
replace it with a new relief valve.
The relief valve capacity must exceed the BTU/H input capacity of the
boiler.
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WARNING
To avoid water damage or scalding due to relief valve operation:
• Discharge line must be connected to relief valve outlet and run
to a safe place of disposal. Terminate the discharge line in a
manner that will prevent possibility of severe burns or property
damage should the relief valve discharge.
• Discharge line must be as short as possible and the same size
as the valve discharge connection throughout its entire length.
• Discharge line must pitch downward from the valve and
terminate at least 6" above the floor drain, making discharge
clearly visible.
• The discharge line shall terminate plain, not threaded, with a
material serviceable for temperatures of 375
• Do not pipe discharge to any location where freezing could
occur.
• No valve may be installed between the relief valve and boiler or
in the discharge line. Do not plug or place any obstruction in the
discharge line.
• Test the operation of the relief valve after filling and pressurizing
the system by lifting the lever. Make sure the valve discharges
freely. If the valve fails to operate correctly, immediately replace
with a new properly rated relief valve.
• Test relief valve at least once annually to ensure the waterway
is clear. If valve does not operate, turn the boiler "off" and call
a plumber immediately.
• Take care whenever operating relief valve to avoid scalding
injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD
RESULT IN FAILURE OF RELIEF VALVE OPERATION, RESULTING
IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE
PERSONAL INJURY, OR DEATH.
Do not thread a cap or plug into the relief valve or relief valve line
under any circumstances! Explosion and property damage, serious
injury, or death may result.
RE-INSPECTION OF RELIEF VALVES: Relief valves should be inspected
AT LEAST ONCE EVERY THREE YEARS, and replaced if necessary, by a
licensed plumbing contractor or qualified service technician to ensure
that the product has not been affected by corrosive water conditions
and to ensure that the valve and discharge line have not been altered
or tampered with illegally. Certain naturally occuring conditions may
corrode the valve and its components over time, rendering the valve
inoperative. Such conditions can only be detected if the valve and its
components are physically removed and inspected. Do not attempt to
conduct an inspection on your own. Contact your plumbing contractor
for a re-inspection to assure continued safety.
FAILURE TO RE-INSPECT THE RELIEF VALVE AS DIRECTED COULD
RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD-UP
WHICH CAN RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL
INJURY, OR DEATH.
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F or greater.