A.O. Smith Upsilon Installation And Service Manual page 26

Example:
An UB 70 with a
concentric flue gas system
ø100/150mm has according
to the table a maximum flue
straight length of 25m In the
system that is going to be put
in there are 2 x 45° bends, so
the maximum flue gas length
is
25 – ( 2 x -1.1 ) = 22.8
meters.
26
The appliance produces a white wisp of condensation (pluming). This wisp of condensation
is harmless, but can be unattractive, particularly in the case of outlets in outside walls.
At this time there are 2 different ways of connecting the flue gas/air intake system,
parallel or concentric. See chapter 7.1 and 7.2 how to convert the boiler connection to
the desired option.
100/150 = 350mm
Dismantlement and shorten pipes
Cutting the concentric pipe goes as follows:
- Take out the inner tube by turning it until it releases from its security position;
- Cut just as much from the air intake part as from the flue gas part;
- Take off the burrs from the cutting edge to prevent cutting the seals;
- Click the pipes back together again.
Use special grease to simplify the fitting
When mounting the flue gas system, pay attention to the flow direction. An arrow on the
product points this out. It is not permitted to mount a system upside down and will lead
to complaints.
Refer to table 7.4.b for maximum applicable pipe length.
UB 70
UB 110
UB 140
UB 70
UB 110
UB 140
Maximum flue length for individual flue gas outlet
Parallel flue system
ø100mm
Maximum straight length 100
Maximum straight length 100
Maximum straight length 100
Concentric flue system
ø100/150mm
Maximum straight length 100/150
Maximum straight length 100/150
Maximum straight length 100/150
figure 7.4.b
A
in m
63
87° bend resistance length -1,8
45° bend resistance length -0,9
35
87° bend resistance length -1,8
45° bend resistance length -0,9
12
87° bend resistance length -1,8
45° bend resistance length -0,9
B
in m
25
87° bend resistance length -2,6
45° bend resistance length -1,1
15
87° bend resistance length -2,6
45° bend resistance length -1,1
87° bend resistance length -2,6
45° bend resistance length -1,1
table 7.4.b
8