Asme Pressure Relief Valve - Riello Array AR 399 SE Installation, Operation And Service Manual

INSTALLATION
Parameters Units
CaCO ppm
3
Trisodium Phosphate ppm
Chlorine ppm
Pressure PSI
Glycol %
− Avoid an automatic water fill system.
− Use only untreated water to fill the system.
− Do not use TSP (tri-sodium phosphate)
− Do not use fill water treated with salt bedding type ex-
changers (ion exchanger).
− Consult a local water treatment specialist for recommenda-
tions if any of the above table is outside the stated ranges.
− When using oxygen permeable PEX, the system must be
separated from the boiler by a heat exchanger.
− A correctly sized and working expansion vessel must be in-
stalled.
− Excessive flow can cause erosion damage to the heat ex-
changer.
9
CAUTION: For freeze protection use only propylene glycol, with
scale inhibitors, with a maximum volume [concentration] of
50% of glycol. Frost protection and inhibitor level has to be
checked annually during the regular scheduled maintenance
of the condensing boiler.
9
CAUTION: The boiler, when used in connection with a refriger-
ation system, must be installed so the chilled medium is piped
in parallel with the boiler with appropriate valves to prevent
the chilled medium from entering the boiler.
9
CAUTION: The boiler piping system of a hot water boiler con-
nected to heating coils located in air handling units where
they may be exposed to refrigerated air circulation must be
equipped with flow control valves or other automatic means to
prevent gravity circulation of the boiler water during the cooling
cycle. A minimum water pressure is required for optimum per-
formance. Minimum water pressure required: 7.25 psi (0.5 bar).

3.9 ASME pressure relief valve

The Array AR SE has a pressure relief valve supplied with the boiler.
Connect the valve hydraulically on the heating supply connection
and in vertical position.
This device is designed for emergency safety relief and shall not be
used as an operating control.
9
WARNING To avoid water damage or scalding due to relief valve
operation:
− The 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.
− The discharge line must be as short as possible and be the
same size as the valve discharge connection throughout its
entire length.
− The discharge line must pitch downward from the valve
and terminate at least 6'' (152 mm) above the floor drain
where any discharge will be clearly visible.
− The discharge line shall terminate through plain (unthread-
ed) pipe. The discharge line material must conform to local
plumbing code or A.S.M.E. requirements.
− No shutoff valve shall be installed between the relief valve
and the boiler, or in the discharge line.
− Do not pipe the discharge to any place where freezing could
occur.
− Do not plug or place any obstruction in the discharge line.
− Test the operation of the valve after filling and pressurizing
Value
Min 50 ; Max 150
absent
< 100
Min 7.25; Max 80
Max 50% (only propylene glycol)
system by lifting the lever. Make sure the valve discharges
freely. If the valve fails to operate correctly, replace it with a
new relief valve.
− For boilers installed with only a pressure relief valve, the
indirect tank (if used) must have a temperature and pres-
sure relief valve installed. This relief valve shall comply with
the standard for Relief Valves for Hot Water Supply Systems,
ANSI Z21.22/CSA4.4.
− Failure to comply with the above guidelines could result
in the failure of the relief valve to operate, resulting in the
possibility of severe personal injury, death or substantial
property damage.
− For safe operation of the appliance, the relief valve must
not be removed or plugged.
Fig. 17 Relief valve
Maintenance of the relief valve
9
CAUTION : The valve lever must be operated at least once a year
by qualified personnel during annual maintenance to insure
that water-ways are clear.
Certain natural occurring mineral deposits may adhere to the
valve, rendering it inoperative.
When manually operating the lever, water will discharge and pre-
cautions must be taken to avoid contact with hot water to avoid
water damage.
Before operating the lever, check to see that a discharge line is
connected to this valve directing the flow of hot water from the
valve to drain otherwise personal injury may result. If no water
flows, the valve is inoperative. Call a qualified plumber immedi-
ately.
Pressure relief valve should be inspected at least once every three
years by a licensed plumbing contractor or authorized inspection
agency, to insure that the product has not been affected by cor-
rosive water conditions and to insure that the valve and discharge
line have not been altered or tampered with illegally.
Certain naturally occurring conditions may corrode the valve or its
components over time, rendering the valve inoperative.
Such conditions are not detectable unless the valve and its com-
ponents are physically removed and inspected.
Do not attempt to conduct this inspection on your own. Contact
your plumbing contractor for a reinspection to assure continuing
safety.
9
WARNING : Failure to reinspect this valve as directed could re-
sult in unsafe pressure buildup which can result in serious in-
jury or death and/or severe property damage.
22