Bedienungsanleitung Buderus SB745WS (Seite 7 von 12) (Englisch)

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System start-up | 7

6 720 805 220 (2012/10)Stainless Steel Condensing Boiler - SB625WS / SB745WS

3 System start-up

This chapter explains how you prepare the system for operation and how

to commission the control panel and the burner.

3.1 Making the system operational

You should check the following to prepare the system for operation:

▶ Operating water pressure of the system ( Chapter 3.2).

▶ Fuel is supplied and the main fuel shut-off valve is open.

▶ Heating system emergency shutoff switch set to ON.

Ask your heating contractor to show you where the fill valve for your

heating system is located.

3.2 Check and correct the operating pressure

Your heating system must contain sufficient water to ensure the

functionality of your system.

If the operating pressure in the system is too low, fill make-up water into

your system ( Chapter 2.4, page 5).

• Recently added fill or make-up water loses much of its volume in the

first few days because it releases gases. With newly filled heating

systems, initially check the operating pressure daily and then in ever

increasing intervals.

• Once fill or make-up water volume has stabilized, check the operating

pressure of the heating water once a month.

All factory default settings will have already been made by the heating

contractor when the system was first commissioned.

3.2.1 Checking the operating water pressure

The recommended operating pressure should remain above 22 psi

(1.5 bar) to eliminate air from the system and prevent system noise.

▶ Read the current operating pressure and temperature ( °F ( °C)) on

the temperature/pressure gauge.

▶ If the operating pressure drops below design, fill up the heating water.

Fig. 2 Pressure/temperature gauge

3.2.2 Filling with heating water and bleeding the system

▶ Slowly fill the heating system via the on-site fill valve. During filling,

observe the display (pressure gauge).

▶ Once the desired operating pressure is reached, stop the procedure.

▶ Bleed the heating system via the purge valves.

▶ Add fill water again if the operating pressure drops as a result of

bleeding the system.

3.3 Starting up the control panel and the burner

Start your boiler via the control panel ( Fig. 3). By starting the control

panel, you also automatically start the burner. The burner is then fired by

the control panel. For further details, see the operating instructions of

the relevant control panel or burner.

▶ Switch the boiler water thermostat [1] to "AUT".

▶ Set the ON/OFF switch [2] to "I" (ON).

Fig. 3 Control panel (for example: Logamatic 4000)

[1] Boiler water thermostat

[2] ON/OFF switch

WARNING:

▶ Do not attempt to start the burner when excess heat

oil has accumulated, when the units is full of vapor, or

when the combustion chamber is very hot.

NOTICE: Risk of system damage due to frequent

refilling.

▶ If you need to add water frequently, the heating

system may be damaged by corrosion and scale

buildup depending on the water quality.

▶ Bleed the heating system. If necessary, fill with make-

up water.

▶ Check the heating system for leaks and the correct

operation of the expansion vessel.

▶ Notify your heating contractor if you find the need to

refill your heating system frequently.

Air pockets may form in the heating system from the fill

or make-up water releasing gases.

Let your local heating contractor show you where the

boiler fill and drain valve for filling and draining the

heating water is located on your heating system.

NOTICE:

The control unit should only be operated by a trained

professional - call your service personnel for servicing

advice.

Follow the control panel operating instructions.

7 747 019 141-17.1RS

6 720 642 624-03.1O

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