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Heating engineer
Installation, use and maintenance manual – M gas unit heater
21
3
Table3.2 Permissible pressure drop depending on model and mounted diaphragm
Air diaphragm Fumes diaphragm Admissible pressure drop (Pa)
Height (mm) Code Height (mm) Code maximum Minimum
M20, M20 C ----- ----- 60 019 40 -----
M25
----- ----- ----- ----- 30 12
----- ----- 45 012 16 -----
M30, M30 C
84 007 ----- ----- 35 23
84 007 55 013 25 -----
M35, M36
----- ----- ----- ------ 42 25
----- ----- 40 014 24 10
----- ----- 50 020 12 -----
M40
----- ----- ----- ----- 30 19
----- ----- 35 026 19 -----
M50
----- ----- ----- ----- 27 8
----- ----- 35 026 8 -----
M60, M60 C
----- ----- ----- ----- 69 45
----- ----- 45 012 46 22
----- ----- 55 013 21 -----
Table3.3 Pressure drop for air and ue pipes and coaxial exhausts
M20 M20 C M25 M30 M30 C M35 M36 M40 M50 M60 M60 C
Flue gas exhaust pressure drop
Ø 110 mm
Pipe 1 m Pa 0,4 0,6 0,7 1,7 1,3 1,7 2,3 3,8
Elbow 90° Pa 0,7 1,3 1,4 3,7 2,8 3,7 5,1 8,6
Tee Pa 1,1 1,9 2,0 5,1 4,0 5,1 6,9 11,3
Ø 130 mm
Pipe 1 m Pa 0,2 0,3 0,8 0,6 0,8 1,0 1,7
Elbow 90° Pa 0,4 0,6 0,7 1,9 1,5 1,9 2,6 4,3
Tee Pa 0,5 0,8 0,9 2,3 1,8 2,3 3,1 5,0
Air intake pressure drop
Ø 130 mm
Pipe 1 m Pa 0,1 0,2 0,4 0,2 0,4 0,5 0,7
Elbow 90° Pa 0,2 0,3 0,4 0,9 0,5 0,9 1,2 1,8
Tee Pa 0,3 0,4 0,5 1,1 0,7 1,2 1,5 2,2
Coaxial exhaust pipe pressure drop
Ø 130/180
mm
wall (1) Pa 2,0 3,7 4,4 9,3 7,4 9,3 13,2 24,9
Ø 130/210
mm
roof Pa 2,2 4,3 4,9 10,6 8,2 10,6 14,5 29,4
(1) Can be used only with OSTF009 support bracket
If horizontal ue gas exhaust pipes having lengths
above 1 m are installed, the ue gas exhaust pipe
must be mounted with a downward slope of 2 to 3
cm each 1-m length (Figure 3.7
p.21
), to prevent
condensate drops entering the unit.
In the case of installations of vertical ue pipes
longer than 1.5 m, to prevent any drops of con-
densation entering the generator, it is necessary
to provide a Tee element on the base of the ver-
tical ue pipe to collect any condensation (Figure
3.2
p.20
).
Figure3.7 Slope of horizontal pipes
2 -3 cm/m
For proper installation of the wall external terminals for
the ue gas exhaust and combustion air intake, follow the

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