Testing For Gas Leaks; Filling The Boiler; Filling The Condensate Trap; Bleeding The Gas Supply Valve - Buderus Logamax plus GB142-24 Installation Instructions Manual

8
Start-up procedure
8.1

Testing for gas leaks

Prior to start-up of the boiler you must check the external tightness of the
gas supply valve and confirm this in the start-up report.
WARNING:
▶ Cover endangered positions before leak testing.
▶ Do not spray the leak testing agent onto cables, plugs
or electrical connection lines. Do not allow it to drip
onto them either.
DANGER:
Leaks may be caused to pipes and screw connections
during commissioning and maintenance activities.
▶ Carry out a proper leak test.
▶ Only use approved leak detection agents for leak
detection.
▶ Disconnect the heating system from the power supply.
▶ Check the exterior tightness of new conduit sections up to and
including the direct sealing point on the gas burner fitting. The
maximum test pressure allowed on the input of the gas burner fitting
is 14 inch W.C. (35 mbar).
8.2

Filling the boiler

. [p/0.0| appears in the display of the
a
Set the main switch to "1"
BC10 telling you that there is no system pressure.
▶ Fill the heating system to a pressure of around 20 psi (1.5 bar).
NOTICE:
▶ Observe the space heating water requirements as
described in paragraph 1.4 on page 4.
▶ Observe the pressure on the BC10 or the P/T gauge in the pump
manifold for the heating circuit. The fill pressure of the system should
be at least the required inlet pressure for the expansion tank plus
7.2 psi (0.5 bar). The minimum pressure is 15 psi (1.0 bar) (on a
cold system). The maximum pressure is 44 psi (3.0 bar) (if the
heating medium temperature is at its highest possible level). If this
pressure is exceeded, the pressure relief valve will open.
NOTICE:
If a relief valve discharges periodically, this may be due
to thermal expansion in a closed water supply system.
▶ Contact the water supplier or local plumbing
inspector on how to correct the situation. Never plug
the relief valve.
For first time start up it is necessary to set the DHW temperature knob h
and the space heating water temperature knob i to the desired setting
( 9.3.2 and 9.3.3). Factory setting is "0".
WARNING:
There is a hot water scald potential if the BC10 is set too
high.
8.3

Filling the condensate trap

▶ Make sure that you fill the condensate trap with water. This is to
prevent exhaust gases from entering the room.
▶ Remove the condensate trap ( fig. 34) by disconnecting the
connection to the heat exchanger and the connection to the
condensate bypass pipe.
22
Fig. 34 Filling water into the condensate trap
▶ Fill with water and refit the condensate trap in reverse order.
WARNING: Danger of fatal accident due to poisoning.
If the condensate trap is not filled with water, flue gas
can escape and put people's lives at risk.
8.4

Bleeding the gas supply valve

▶ Loosen the screw plug on the testing nipple for the gas connection
and venting ( fig. 35, [1]) by two turns and fit a hose.
Fig. 35 Bleeding the gas supply conduit
▶ Slowly open the gas shut-off valve.
▶ Run the gas that is discharged through a water bath.
▶ Close the gas shut-off valve when no more air is released.
▶ Remove the hose and tighten the screw plug again.
8.5

Checking the combustion air/flue gas connection

Check the following points:
▶ Is the prescribed combustion air/flue system used?
▶ Have the instructions for configuring the flue system as specified in
the relevant Installation instruction for the flue gas system been
observed?
8.6

Checking the orifices

CAUTION:
The burner must only be commissioned if the correct
orifices are fitted ( table 5).
▶ Convert the burner fitting to another gas type if
required ( chapter 6.8 "Conversion to Propane",
page 18).
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
72150200-33.1TD
1
72150200-34.1TD