Safety Devices - A.O. Smith Innovo IR 12-160 Installation, User And Service Manual

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0312266_INNOVO_UKUK_V5.1, 2022-07-12

Safety devices

Fig. Safety devices
!
Safety devices of the water heater:
Temperature
sensor (1)
Gas control valve (2)
Air proving switch (3)
Flame probe (4)
Safety devices of the installation:
Expansion vessel
Expansion valve
Pressure-reducing valve
Temperature and
pressure relief valve
(T&P valve)
(1)
1 - All installations have a T&P valve connection. A T&P valve is mandatory for unvented installations.
Note
This manual only discusses unvented installations.
The water heater controls the water temperature
using a temperature sensor:
- T < 5 ºC, frost protection is activated.
- T > 90 ºC, max. temperature.
- T > 97 ºC, for extra safety.
The gas control valve controls the gas supply to
the burner.
The air proving switch guarantees the air supply
differential during pre-purging.
The flame probe detects if there is a flame in the
burner.
1. Temperature sensor
2. Gas control valve
3. Air proving switch
4. Flame probe
"
The expansion vessel
stores temporarily
expansion water to
keep the pressure in
the installation at the
right level.
The expansion valve
prevents excessive
pressure in the tank of
the water heater.
The pressure-reducing
valve reduces the
water mains pressure,
if necessary.
The T&P valve prevents
excessive pressure and
temperature in the
tank.
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