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Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Converting the appliance to propane or high altitude 15
15 Converting the appliance to propane or high altitude conversion
z Close the gas shut-off valve.
z Switch off the heating system using the main switch.
z Remove the casing.
z Loosen the screw connection on the gas burner
fitting (fig. 38, pos. 1, page 46) and pull the plug
(fig. 38, pos. 2, page 46) from the gas burner fitting.
z Pull the plug from the fan unit (fig. 38, pos. 3,
page 46).
z Loosen both retaining clips (fig. 38, pos. 4, page 46)
on the burner cover and remove the burner cover
together with the fan unit and the gas burner fitting.
z Loosen the three crosshead screws and remove the
gas burner fitting from the fan unit (fig. 139, pos. 1).
z Remove the gas orifice (fig. 139, pos. 2).
z Fit the right orifice for the new type of gas supply
(table 14). Make sure not to damage the O-rings.
z Re-assemble all parts in reverse order of disas-
sembly.
z Carry out the start-up activities and complete a new
start-up report.
z Also check all joints and gaskets affected by the
installation activities while carrying out the tightness
test in operating conditions.
z Place a new sticker over the existing sticker
indicating the type of gas supply installed.
z Fit the casing again.
NOTICE
The appliance is factory set for operation with
natural gas at elevations up to 4,500 ft.
The appliance must be derated for installa-
tions above 4,500 ft. The derate is accom-
plished by changing the main burner orifice.
Contact Buderus in this case to obtain the suit-
able high elevation conversion kit.
DANGER
if flammable gas explodes.
Only carry out work on gas conduits and
fittings if you are licensed for such work.
Fig. 139 Replacing the gas orifice
1
2
Appliance
capacity
Type of gas
supply
Gas orifice
diameter
in mm (inch)
Type of orifice
above 4,500 ft
24 kW Natural gas 4.45 (0.174) 4.65 (0.181)
LPG P 3.35 (0.131) 3.35 (0.131)
30 kW Natural gas 4.45 (0.174) 4.65 (0.181)
LPG
P 3.35 (0.131) 3.35 (0.131)
45 kW Natural gas 5.35 (0.209) 5.55 (0.216)
LPG P 4.05 (0.158) 4.05 (0.158)
60 kW Natural gas 7.25 (0.283) 7.45 (0.291)
LPG
P 5.35 (0.209) 4.05 (0.158)
Table 14 Gas orifice diameter
86


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