Technical data

SERVICING

AND

MAINTENAN

INSTRUCTIONS

CONDENSING WALL-HUNG BOILER – TG05A052.A0205

LIMITER

The boiler is equipped with a variable flow limiter at the cold water inlet. The flow limiter can be adjusted by turning the screw in

order to obtain the correct flow rate of domestic hot water for the specific boiler output.

FLOWSWITCH

This device gives precedence to domestic hot water and is fitted to boilers which supply instantaneous hot water. It allows

conversion to hot water even with a minimum hot water demand (min. 2 litres), using an electromagnetic principle with

electrical switching by means of a relay. The device is made of non-toxic, corrosion-proof ZYTEL 101 L plastic material which

has type approval with non-toxic characteristics and is unaffected by hard water. In addition, a filter is fitted before the

flowswitch and at the cold water inlet which eliminates any water impurities. These features guarantee that the flowswitch

operation is highly efficient.

BY-PASS

All boilers are fitted with a by-pass. This element is essential in the following cases:

• if a two-way zone valve is installed

• if thermostat valves are installed in the radiators.

To adjust the by-pass proceed as follows:

fit the screwdriver to the plastic screw of the by-pass, bearing in mind that when the slot of the screw is horizontal the by-pass

is totally open, allowing all the water to pass, while when it is vertical the by-pass is totally closed. For partial by-pass flows,

use the adjuster screw.

DIVERTER VALVE

The diverter valve is the device which controls the boiler switching from central heating to d.h. water circuit and vice versa.

the new 3-way valve transparent cover allows to see the operation mode according to the disk colour: red disk ⇒ heating

mode; blue disk ⇒ domestic hot water mode.

The new 3-way valve does not have the middle position function (in case of motor failure);

DIFFERENTIAL AIR PRESSURE SWITCH FOR FAN CONTROL

To guarantee maximum safety in flue exhaust, a differential pressure switch is installed on room-sealed boilers and on forced

draught boilers. This pressure switch automatically controls perfect functioning of the fan and the passage of both external air

and exhaust flue pipes.