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WARNING: Precautions must be taken prior
to manually operating the relief valve to
avoid contact with hot water being released
and to prevent water damage.
WARNING: If a relief valve discharges
periodically, this may be due to thermal
expansion in a closed water supply system.
Contact the installer to correct this
situation. Do not plug the relief valve.
B A listed pressure and temperature relief valve (PTRV)
must be installed at the time of installation. No valve
is to be placed between the PTRV and the heater. No
reducing coupling or other restriction may be
installed in the discharge line. The discharge line must
be a minimum of 6" (153 mm) above a drain and
installed such that it allows complete drainage of
both the PTRV and the line. The discharge line must
be placed where it will not cause any water damage.
The location of the PTRV must be readily accessible
for servicing or replacement, and be mounted as close
to the water heater as possible.
B Manually activate the TPRV annually to ensure proper
operation. If the TPRV does not activate it must be
replaced.
B Make sure that the installed pipework and
connections are free of stress.
B Check all connections for leaks! Do not kink or twist
hoses.
Safety valve
Only use approved and listed pressure and temperature
relief valves of the proper size for the output of the tank.
Minimum
Nominal capacity
connection
of the water
diameter
chamber (gal)
3/4"
32 (120 liters)
Table 3
Safety valve
6 720 648 071 (2012/03)
5.3
Install a temperature sensor or an Aquastat on the DHW
tank to measure and monitor the hot water temperature.
5.3.1
B Feed the temperature sensor [2] with the spring [1]
into the sensor well [3].
3
2
1
Fig. 7
1
2
3
Max. heating
capacity
[kBtu/hr]
255
Temperature monitoring control
options
Installing the temperature sensor
Ensure that the sensor surface has contact
with the sensor well surface over its full
length, and that it cannot accidentally be
pulled out.
Installing the temperature sensor
Spring clip
Temperature sensor
Sensor well
Installation
6 720 648 100-07.1ITL
9
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