Manual A.O. Smith ADMR50 (page 13 of 96) (English)

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Instruction manual ADMR 13

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2.4.2 Water temperature protection

The electronic controller uses temperatures sensors T1 (7) and T2 (13) to

monitor three temperatures that are important for safety. The table explains the

functioning of the temperature sensors.

Temperature protection

2.4.3 Flue gas backflow safeguard

The flue gases are discharged to the outside via the draught diverter (33) and

the chimney. To prevent flue gases accumulating in the boiler room, the

discharge of flue gases is monitored by a flue gas sensor (34). The flue gas

sensor is mounted in the draught diverter.

2.4.4 Flame probe

To ensure that no gas can flow when there is no combustion, the water heater

is fitted with a flame probe (21). The electronic controller uses this probe to

detect the presence of a flame, by means of ionisation detection. The electronic

controller closes the gas control the instant it detects that there is a gas flow but

no flame.

2.5 Safety of the

installation

In addition to the appliance's standard built-in safety monitoring, the appliance

must also be protected by an expansion vessel, expansion valve, pressure

reducing valve, non-return valve and a T&P valve.

The use of an expansion vessel, expansion valve and/or pressure reducing

valve depends on the type of installation: unvented or vented.

2.5.1 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")

2.5.2 Vented installation

With a vented installation, excess pressure is taken up by the open cold water

head tank. The height of the head 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, that opens into the cold water tank.

Ideally, the vent pipe should discharge into a separate tundish/drain or

otherwise to the open cold water head tank. The water heater should also be

fitted on the hot water side with a stop valve (3.7.3 "Hot water side")

Protection Description

Against frost

(T1 < 5°C or T2 < 5°C)

The frost protection cuts in. The water is heated to 20 °C.

For maximum water temperature

(T1 > 85 °C or T2 > 85 °C)

The high-limit safeguard serves to prevent overheating and/or excessive

formation of scale in the appliance. If the high-limit safeguard is activated, the

heating is stopped. This causes the water in the tank to cool down. Once the

water has cooled sufficiently (T1 < 78 °C), the electronic controller resets the

appliance.

For extra safety

(T1 > 93 °C or T2 > 93 °C)

A lockout error of the water heater controller takes place. The controller must

be manually reset before the appliance can resume operation (8.3 "Error

conditions"). The reset may only be performed if T

<78 °C.

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A.O. Smith ADMR50 Manual

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