Transcript
Bulletin Number: TBG-42 | Model: GB142 series boilers
Technical service bulletin
Heat Exchanger Cleaning
Heat Exchanger Cleaning Procedure
Switch off the power supply of the heating system on the circuit breaker.
Set the main switch on the BC10 to “0” (Off).
Remove the casing.
Close the gas shut-off valve (see fig. 1, pos. 1).
Remove the cable plug from the gas control valve (see fig. 3). Figure 3
Figure 1
Closed
Remove both cable plugs [Fig.4, pos.1] from the fan unit. Figure 4
Open
Loosen the union nut of the gas control valve (see fig. 2, pos. 1). Figure 2 1
Pull down on both retaining clips [Fig.5, pos.1] to open and remove the burner cover. Figure 5
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Bulletin Number: TBG-42 | GB142 Heat Exchanger Cleaning
Remove the burner gasket (see fig. 6, pos. 1).
Remove the gas/air distributor plate (see fig. 6, pos. 2).
Remove the orifice plate (only applies to Logamax plus GB142-24/30 and GB142-60) (see fig. 6, pos. 3). Note that the orifice plate of the GB142-60 has a different shape.
Remove the burner (see fig. 6, pos. 4).
Technical service bulletin
Remove both the hot surface ignitor and the ionization electrode from heat exchanger [Fig.8]. Figure 8
Figure 6
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Paint or spray Heat Exchanger with mineral oil
Re-assemble all parts in reverse order of disassembly.
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WARNING It is important to inspect the rubber gaskets. Replace brittle, discolored, split or worn rubber gaskets.
Switch on the heating system using the main switch.
Disconnect the hot surface ignitor and ionization electrode plugs.
Press the “Chimney Sweep” button until the decimal point is displayed. Leave the boiler on for approx. 10 minutes.
Loosen the fastening screws [Fig.7, pos.1].
Switch off the heating system using the main switch.
Pull the ground cable from the hot surface ignitor [Fig.7, pos.2].
Dismantle the boiler again and flush the heat exchanger with water.
Dismantle the mounting plate [Fig.7, pos.3].
Pull the condensate trap from the condensate plate (fig. 9, pos. 1).
Figure 7
Figure 9
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Pull the internal condensate bypass pipe (if installed) from the condensate trap (see fig. 9, pos. 2).
2 of 3 Data subject to change without notice | BTC 435002109 A | 07.2013
Buderus
Bulletin Number: TBG-42 | GB142 Heat Exchanger Cleaning
Loosen the condensate trap from the connection (fig. 9, pos. 3) and remove it.
Use a bristle brush to clean the condensate trap.
Flush the condensate trap.
Open latches [Fig. 10, pos.1] on the condensate collector.
Technical service bulletin
Figure 10 1
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Remove the condensate collector.
Remove the baffle plate and clean it using compressed air [Fig. 11]. If necessary brush fins with a stiff nylon brush.
Figure 11
Check the condensate trap gasket for damage and replace it if necessary.
Fill the condensate trap with water before re-installing it.
Reassemble all parts in reverse order of disassembly.
NOTICE For heavy build up, repeat procedure.
NOTICE Recommended cleaning interval is every 2 years.
3 of 3 Data subject to change without notice | BTC 435002109 A| 07.2013
Bosch Thermotechnology Corp. 50 Wentworth Ave Londonderry, NH 03053 Tel: (800) 283-3787 Fax: (603) 965-7581 www.buderus.us Buderus
