Robur E 32, Installation, Operation And Maintanance, Page: 18 / 34

16
Installation, Operation and Maintenance Manual - Ed.07/2005
EVOLUZIONE series natural gas/LPG heaters
For each “T”-shaped element, consider an increase in length of 2 metres.
For each 45° bend, calculate an increase in length of 0.75 metres.
APPROXIMATE MAXIMUM LENGTHS ALLOWED FOR EACH TYPE OF INSTALLATION
TYPE OF INSTALLATION
B 23 C 13 C 33 C 53
COAXIAL ROOF
PIPE Ø 80
COAXIAL
WALL
Ø 80
Ø 80 Ø 100
HORIZONTAL VERTICAL
SEPARATE
PIPES
Ø 80
PIPES Ø 80 PIPES Ø 80 PIPES Ø 80 PIPES Ø 100
SEPARATE
PIPES
Ø 80
MOD.
EXHAUST GAS EXHAUST GAS AIR/EXH. AIR/EXH. AIR/EXH. AIR/EXH. AIR/EXH. AIR/EXH.
E 32 20 20 16+16 14+14 13+13 15+15 20+20 1+15
E 42 20 20 14+14 13+13 12+12 14+14 20+20 1+15
E 43 20 20 13+13 12+12 10+10 12+12 20+20 1+15
E 52 20 20 10+10 8+8 7+7 9+9 15+15 1+15
E 72 15 15 7+7 7+7 4+4 6+6 15+15 1+10
Table 4
If your installation does not correspond with the figures given in Table 4 above (e.g. type C13 installation of
an E 52 with air pipe diameter Ø 80 length 10 m and exhaust gas pipe diameter Ø 80 length 16 m), it is
necessary to calculate the pressure drop of the pipe system and verify that the sum is not greater than the
admissible pressure drop, or alternatively to contact ROBUR’s Pre-sales service on 035/888111.
CALCULATION – AN EXAMPLE
Let us hypothesise that we are installing an E 43 heater. The air/exhaust gas system will be created from
separate pipes, Ø 80, in the following way:
-
20 metres of exhaust gas pipe Ø 80
- Four 90
°
bends, Ø 80, on the exhaust gas pipe
- 8 metres of air pipes, Ø 80
It is now possible to proceed with a test calculation, remembering that the minimum admissible pressure drop
is 8 Pa while the maximum admissible pressure drop is 40 Pa (see Table 2).
Quantity Pressure drop
Exhaust gas pipe Ø 80 20 m x 1.39 Pa = 27.8 Pa +
90
°
bends on exhaust gas pipe
4 x 2.08 Pa = 8.32 Pa +
Air pipe Ø 80 8 m x 0.74 Pa = 5.92 Pa =
Total pressure drop 42.04 Pa
The total pressure drop of the pipe system is higher than the maximum admissible pressure drop
(42.04 Pa, HIGHER than 40 Pa). Therefore, the installation IS NOT PERMITTED.
Installation will be possible if one of the following measures is adopted:
- reducing the length of the air/exhaust gas pipes;
- reducing the number of bends in the exhaust gas pipe;
- increasing the diameter of the pipes to 100mm
NOTE
NOTE