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Temperatu re=Pressu re Relief Valve
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Explosion Hazard
•Tem perature-pressure relief valve
must comply with ANSI A2122,
CSA 4.4 andASME code.
• Properly sized temperature-relief
valve must be installed in opening
provided.
• Can result in overheating and
excessive tank pressure.
• Can cause serious injury or death.
HOT WATER
OUTLET
DRAINVALVE._
DRAFT HOOD
COLDWATER
INLET
_&_.-...==
\
SHUTOFF
VALVE
TEMPERATURE*
PRESSURE
RELIEF VALVE
(DO NOT CAP OR PLUG)
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.
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 = 1,035kPa) and a discharge capacity
not less than the water heater input rate as shown on the
model rating plate.
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 (153 mm)
above, or at any distance below the structural floor, see
Figure 16. 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.
FIGURE 17,
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. To
prevent bodily injury, hazard to life, or property damage, the
relief valve must be allowed to discharge water in quantities
should circumstances demand. If the discharge pipe is not
connected to a drain or other suitable means, the water flow
may cause property damage.
Water Damage Hazard
, Temperature-pressure relief valve discharge
pipe must terminate at adequate drain.
14
The Discharge Pipe:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both
the temperature-pressure relief valve, and the discharge pipe.
• Shall terminate at an adequate drain.
• Shall not have any valve between the relief valve and tank.
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