DORCHESTER DR-FC 25, Installation, Commissioning And Maintenance Instructions

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Installation
22 Instruction Manual DR-FC
3
is
Tabel 3.5 Gas data
3.5 Installation diagram
Figure 3.3 shows the water and gas connection diagrams for unvented and
vented installations. The following paragraphs, describing the connections in
detail, make reference to these diagrams.
Gas category data
II
2H3+
Unit DR-FC 25 DR-FC 30 DR-FC 45 DR-FC 60
Data for natural gas 2H: G20-20 mbar
Orifice diameter mm 4.90 5.10 7.00 7.10
(1) = flat sealing plate
(2) = burner pressure regulator 1 or 2 2 2 2 2
Nominal load (gross) kW 31.5 33.9 51.6 62.0
Nominal output kW 29.8 32.0 47.9 58.6
Supply pressure mbar 20 20 20 20
Burner pressure mbar 8.5 8.5 8.5 11.5
Gas consumption
(1)
m
3
/h 3.1 3.3 5.0 6.0
Data for LP gas 3+
General
Orifice diameter mm 2.50 2.60 3.40 3.80
(1) = flat sealing plate
(2) = burner pressure regulator 1 or 2 1 1 1 1
G30-30 mbar (butane)
Nominal load (gross) kW 30.1 32.2 49.6 58.3
Nominal output kW 29.2 31.2 47.2 56.5
Supply pressure mbar 30 30 30 30
Burner pressure
(2)
mbar - - - -
Gas consumption
(1)
kg/h 2.2 2.4 3.7 4.3
G31-37 mbar (propane)
Nominal load (gross) kW 28.5 30.3 49.3 58.0
Nominal output kW 27.5 29.3 46.8 56.1
Supply pressure mbar 37 37 37 37
Burner pressure
(2)
mbar - - - -
Gas consumption
(1)
kg/h 2.1 2.2 3.6 4.2
(1) Based on 1013.25 mbar and 15
o
C.
(2) If using a flat sealing plate instead of a burner pressure regulator, it is assumed that the burner pressure is equal to the supply pressure.
In practice however, the burner pressure will be lower.