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3
System start-up
This chapter explains how you prepare the system for operation and how
to commission the control panel and the burner.
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.
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.
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.
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.
Air pockets may form in the heating system from the fill
or make-up water releasing gases.
• 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.
Stainless Steel Condensing Boiler - SB625WS / SB745WS
Fig. 2 Pressure/temperature gauge
3.2.2 Filling with heating water and bleeding the system
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.
▶ 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
NOTICE:
The control unit should only be operated by a trained
professional - call your service personnel for servicing
advice.
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).
1
2
Fig. 3 Control panel (for example: Logamatic 4000)
[1]
Boiler water thermostat
[2]
ON/OFF switch
Follow the control panel operating instructions.
System start-up | 7
7 747 019 141-17.1RS
6 720 642 624-03.1O
6 720 805 220 (2012/10)
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