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Bosch C 950 Installation Manual page 24

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24 | Installation instructions
Altitude (above sea
Vent
level)
terminal
0 - 2000 ft
Concentric
(0 - 610 m)
Twin
system
2000 - 4500 ft
Concentric
(610 - 1372 m)
Twin
system
4500 - 8000 ft
Concentric
(1372 - 2439 m)
Twin
system
* Above 2000 ft, CO2 levels must be checked with a combustion gas analyzer, see chapter 7.5 for instructions.
Table 32 C950ES Fan speed adjustment for 3" piping
1) Full equivalent length (inlet + outlet piping + fittings)
Altitude (above
Vent
sea level)
terminal
0 - 2000 ft
Concentric
(0 - 610 m)
Twin
system
2000 - 4500 ft
Concentric
(610 - 1372 m)
Twin
system
4500 - 8000 ft
Concentric
(1372 - 2439 m)
Twin
system
* Above 2000 ft, CO2 levels must be checked with a combustion gas analyzer, see chapter 7.5 for instructions.
Table 33 Fan speed adjustment for 4" piping
1) Full equivalent length (inlet + outlet piping + fittings)
6 720 805 440 (2014/11)
Natural Gas
Minimum
Total equivalent vent
power fan
1)
length
speed (P2)
6 - 25 ft
26 - 46 ft
6 - 37 ft
38 - 62 ft
6 - 25 ft
26 - 46 ft
6 - 37 ft
38 - 62 ft
6 - 25 ft
26 - 46 ft
6 - 37 ft
38 - 62 ft
Natural Gas
Minimum
Total equivalent vent
power fan
1)
length
speed (P2)
3.5 - 39 ft
40 - 86 ft
3.5 - 59 ft
60 - 126 ft
3.5 - 39 ft
11*
40 - 86 ft
11*
3.5 - 59 ft
10*
60 - 126 ft
11*
3.5 - 39 ft
11*
40 - 86 ft
13*
3.5 - 59 ft
11*
60 - 126 ft
12*
Liquid
propane
Natural Gas
Minimum
Maximum
power fan
power fan
speed (P2)
speed (P1)
No modification required on installations below 2000 ft Altitude
11*
14*
11*
14*
10*
13*
11*
14*
11*
14*
13*
16*
11*
14*
12*
15*
Liquid
propane
Natural Gas
Minimum
Maximum
power fan
power fan
speed (P2)
speed (P1)
No modification required on installations below 2000 ft Altitude
14*
47*
14*
48*
13*
47*
14*
48*
14*
48*
16*
48*
14*
48*
15*
48*
Liquid
propane
Maximum
power fan
speed (P1)
47*
47*
For operation at
elevations above
48*
48*
2,000 ft (610 m)
47*
47*
the equipment
48*
48*
ratings shall be
reduced at the rate
48*
48*
of 4% for each
48*
48*
1,000 ft (305 m)
48*
48*
above sea level
48*
48*
Liquid
propane
Maximum
power fan
speed (P1)
47*
For operation at
elevations above
48*
2,000 ft (610 m) the
equipment ratings
47*
shall be reduced at
48*
the rate of 4% for
each 1,000 ft (305
48*
m) above sea level
48*
48*
48*
Greentherm

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