A.O. Smith Innovo IR 12-160, Инструкция по установке, эксплуатации и обслуживанию

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6.3 Safety devices
Fig. Safety devices
1
4
2
3
1. Temperature sensor
2. Gas control valve
3. Air proving switch
4. Flame probe
Safety devices of the water heater:
Temperature
sensor (1) 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.
Gas control valve (2) The gas control valve controls the gas supply to
the burner.
Air proving switch (3) The air proving switch guarantees the air supply
differential during pre-purging.
Flame probe (4) The flame probe detects if there is a flame in the
burner.
Safety devices of the installation:
Expansion vessel The expansion vessel
stores temporarily
expansion water to
keep the pressure in
the installation at the
right level.
Expansion valve The expansion valve
prevents excessive
pressure in the tank of
the water heater.
Pressure-reducing valve The pressure-reducing
valve reduces the
water mains pressure,
if necessary.
Temperature and
pressure relief valve
(T&P valve)
(1)
The T&P valve prevents
excessive pressure and
temperature in the
tank.
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.
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