Working principle of the appliance
14
Instruction manual ADM
2
gis
2.5.2
Unvented installation
With an unvented installation, an expansion valve valve and expansion vessel
prevent the buildup of excessive pressure in the tank. This prevents damage
being caused to the enamelled coating (in the appliance) or to the tank. A non-
return valve prevents excessive pressure buildup in the water supply system.
This valve also prevents water from flowing backwards from the tank into the
cold water supply system. The pressure reducing valve protects the installation
against an excessively high water supply pressure (> 8 bar). These components
are fitted to the cold water pipe
(3.6 "Water connections, Vented")
.
2.5.3
Vented installation
With vented installation, excess pressure is taken up by the open cold water
head tank. The head height of the tank determines the working pressure in the
water heater, which may not exceed 8 bar. The installation must also be fitted
with a vent pipe from the hot water pipe
(3.6.3 "Hot water side")
, which opens
into the cold water tank.
2.5.4
T&P valve
A T&P valve is only mandatory in an unvented installation. However, A.O. Smith
also recommends the use of a T&P valve in vented installations.
A T&P (Temperature and Pressure Relief) valve monitors the pressure in the
tank and the water temperature at the top of the tank. If the pressure in the tank
becomes excessive (> 10 bar) or the water temperature is too high (> 97°C), the
valve will open. The hot water can now flow out of the tank. Because the
appliance is under water supply pressure, cold water will automatically flow into
the tank. The valve remains open until the unsafe situation has been rectified.
The appliance is fitted standard with a connecting point for a T&P
valve
(3.7.3 "Hot water side")
.
Содержание ADM - 115
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Страница 10: ...Introduction 10 Instruction manual ADM 1 gis ...
Страница 32: ...Installation 32 Instruction manual ADM 3 is ...
Страница 40: ...Conversion to a different gas category 40 Instruction manual ADM 4 is ...
Страница 46: ...Draining 46 Instruction manual ADM 6 gis ...
Страница 50: ...Status of the appliance 50 Instruction manual ADM 8 gis ...
Страница 52: ...Starting and running 52 Instruction manual ADM 9 gis ...
Страница 54: ...Shutting down 54 Instruction manual ADM 10 gis ...
Страница 60: ...is Instruction manual ADM 60 ...
Страница 72: ...Appendices 72 Instruction manual ADM 14 is ...
Страница 74: ...0306 132 4 0 UK Index Instruction manual ADM ...