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

Page: 32 / 92

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