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We reserve the right to make any changes due to technical modifications!
Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Start-up procedure9
9.5 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?
Has an annular gap clearance measurement been
carried out as part of commissioning? Check this with
a tightness testing instrument if necessary. Were the
permissible limit values observed as specified in the
Installation Instructions for the flue gas system?
9.6 Checking the orrifices
9.7 Inlet gas pressure
z Open at least one thermostatic radiator valve if
present to allow water to flow through the appliance.
Do not switch on the appliance.
z Close the gas shut-off valve. Loosen the screw plug
on the inlet gas pressure testing nipple by two turns
(fig. 28, pos. 1).
z Connect the pressure gauge connection hose to the
testing nipple (fig. 28, pos. 2).
z Slowly open the gas shut-off valve.
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of ½ psi (3.5 kPa).
The appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than ½
psi (3.5 kPa).
Type of gas
supply
Factory setting of gas burner fitting
Natural gas
H Delivered factory-set to Wobbe index
14.1 kWh/m
3
(based on 59 °F (15 °C),
14.7 psi (=1,013 mbar)) , suitable for Wobbe
index range 11.3 – 15.2 kWh/m
3
.
Information on gas type instruction plate:
Set to gas category: G 20 – 2E.
Previous indications: set to Wobbe index
15.0 kWh/m
3
(based on 32 °F (0 °C), 14.7 psi
(=1,013 mbar)), suitable for Wobbe index
range 12.0 – 15.7 kWh/m
3
.
LPG
P Suitable for propane after conversion (also
see the chapter "Conversion to another type
of gas supply").
Information on gas type instruction plate:
Set to gas category: G 31 – 3P.
Table 6 Factory setting of gas burner fitting
CAUTION
The burner must only be commissioned if the
correct orrifices are fitted (table 7).
z Convert the burner fitting to another gas
type if required (see chapter 15
"Converting the appliance to propane or
high altitude conversion", page 86).
Appliance
capacity
Type of gas
supply
Gas orifice
diameter
in mm (inch)
High altitude
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 7 Gas orifice diameter
Fig. 28 Measuring the inlet gas pressure
30


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