Unit installation

User, Installation and Service Manual for F1 Gas Unit Heaters 13
Ed. 05/2009
MAXIMAL PIPE LENGTH BY VARIOUS INSTALLATION
Type of Installation
B 23 C 13 C 33 C 53
Coaxial pipe wall
Coaxial pipe Roof
Pipe Ø 80
Ø 125
(OSCR007)
Ø 180
(OKTC004)
Ø 125
(OSCR008)
Ø 150
(OSCR009)
Ø 210
(OKTC001)
Horiz. Verti.
Separate
pipe
Ø 80
pipe
Ø 80
pipe
Ø 130
pipe
Ø 80
pipe
Ø 100
pipe
Ø 130
pipe 80
Mod
flue flue air/flue air/flue air/flue air/flue air/flue air/flue air/flue
F1 21 21 16 13+13 12+12 N.D. 8+8 15+15 N.D. 1+15
F1 31 17 14 11+11 10+10 N.D. 5+5 7+7 N.D. 1+14
F1 41 15 11 10+10 8+8 N.D. N.P. 4+4 N.D. 1+12
F1 51 25 23 14+14 N.P. 15+15 N.P. 8+8 15+15 1+15
F1 61 20 18 11+11 N.P. 12+12 N.P. 6+6 15+15 1+14
F1 81 8 6 5+5 N.P. 10+10 N.P. n.r. 14+14 1+6
Table 4
N.P.: INSTALLATION NOT POSSIBLE N.D.: INSTALLATION NOT AVAILABLE
NOTE
When Your installation does not coincide with values indicated by table 4 (for example installation
type C
13
with air pipe 10m length and flue pipe 16m length) must be checked the total amount of
the flue system pressure loss. It is to be within the maximum loss allowed for the unit (see
example below).
CALCULUS EXAMPLE
F41 unit with following air/flue system is to be installed:
- 8 meters of flue pipe Ø 80
- 2 elbows 90° Ø 80 on the flue pipe
- 8 meters of air pipe Ø 80
Piping calculus is to be done watching out the maximum allowed pressure drop, which is
30Pa (see table 2).
Quantity Pressure drop
Flue pipe Ø 80 8 x 2,0 Pa = 16,0 Pa +
90° Elbow 2 x 4,1 Pa = 8,4 Pa +
Air pipe Ø 80 8 x 1,0 Pa = 8,0 Pa =
Total pressure drop 32,4 Pa
The total pressure drop of the system is BIGGER than allowed pressure drop (32,4 Pa
HIGHER THAN 30 Pa), therefore the installation is NOT POSSIBLE.
This flue system will be possible only if one of the following actions is taken:
- reduce the flue/air pipe length
- Increase the pipe diameter by using the pipe, Ø100