A.O. Smith Cirrex SUN-80, Инструкция по эксплуатации, Страница: 7 / 20

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This heater is provided with a properly certified combination
temperature - pressure relief valve by the manufacturer.
The valve is certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment
of materials as meeting the requirements for Relief Valves for Hot
Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code
requirements of ASME.
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If replaced, the valve must meet the requirements of local codes,
but not less than a combination temperature and pressure relief
valve certified as indicated in the above paragraph.
The valve must be marked with a maximum set pressure
not to exceed the marked hydrostatic working pressure of
the water heater (150 psi = 1,034.21 kPa) and a discharge
capacity not less than the water heater input rate as shown
on the model rating plate (Electric heaters - watts x 3.412
equal BTU/hr rate).
For safe operation of the water heater, the relief valve must
not be removed from its designated opening nor plugged.
The temperature-pressure relief valve must be installed directly
into the fitting of the water heater designed for the relief valve.
Position the valve downward and provide tubing so that any
discharge will exit only within 6 inches (152.4 mm) above an
adequate drain, or external to the building or structure. Be
certain that no contact is made with any live electrical part. The
discharge opening must not be blocked or reduced in size under
any circumstances. Excessive length, over 30 feet (9.14 m), or
use of more than four elbows can cause restriction and reduce
the discharge capacity of the valve.
No valve or other obstruction is to be placed between the relief
valve and the tank. Do not connect tubing directly to discharge
drain unless a 6 inch air gap is provided. The relief valve must
be allowed to discharge water in sufficient quantities, should
circumstances demand, to prevent bodily injury, hazard to life,
or property damage. If the discharge pipe is not connected
to a drain or other suitable means, the water flow may cause
property damage.
The Temperature & Pressure Relief Valve:
• Must not be in contact with any electrical part.
• Must be connected to an adequate discharge line.
• Must be rated higher than the working pressure shown on the
rating plate of the water heater
The Discharge Pipe:
• Must not be smaller than the pipe size of the relief valve or
have any reducing coupling installed in the discharge line.
• Must not be capped, blocked, plugged or contain any valve
between the relief valve and the end of the discharge line.
• Must terminate a maximum of six inches above a floor drain
or external to the building. In cold climates, it is recommended
that the discharge line be terminated at an adequate drain
inside the building.
• Must be capable of withstanding 250°F (121°C) without
distortion.
• Must be installed to allow complete drainage of both the valve
and discharge line.
6” AIR GAP
TO SUITABLE
DRAIN
WATER INLET
SHUTOFF
VALVE
DRAIN
VALVE
TEMPERATURE
PRESSURE
RELIEF VALVE
DISCHARGE PIPE
(DO NOT PLUG)
Figure 2.