A.O. Smith TWI 35-200 Installation, User And Service Manual page 32

32
Safety devices of the installation:
Inlet security
group
Pressure-reducing
valve
T&P valve
Temperature and
pressure relief valve
(1)
1 - All water heaters have a T&P valve connection. A.O. Smith recommends to use a T&P valve.
An inlet security group has a stop valve, a non
return valve and a pressure relief valve. The inlet
security group prevents excessive pressure in the
tank and back flow of expansion water into the cold
water main supply.
The pressure-reducing valve reduces the water
mains pressure, if necessary.
The T&P valve prevents excessive pressure and
temperature in the tank.
Installation, Maintenance and Service part