Bosch C 950 Installation Manual page 23

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 30 Fan speed adjustment for 4" piping
1) Full equivalent length (inlet + outlet piping + fittings)
C950ES Fan Speed Adjustment
Altitude (above sea Vent
level) terminal
0 - 2000 ft Twin
(0 - 610 m) system
2)
2000 - 4500 ft Twin
(610 - 1372 m) system
Table 31 C950ES Fan speed adjustment for 2" piping
1) Full equivalent length (inlet + outlet piping + fittings)
2) When installing in altitude, the unit may not reach the rated Input
3) When adjusting the unit, CO2 levels must be checked with a combustion gas analyzer, see chapter 7.5 for instructions.
Greentherm
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*
Natural Gas
Minimum
Total equivalent vent
power fan
1)
length
speed (P2)
3.5 - 11 ft 12
12 - 19 ft 12
3.5 - 11 ft 13
12 - 19 ft 13
Liquid
propane Natural Gas
Minimum Maximum
power fan power fan
speed (P2) speed (P1)
No modification required on installations below 2000 ft Altitude
14* 52*
14* 53*
13* 52*
14* 53*
14* 53*
16* 53*
14* 53*
15* 53*
Liquid
propane Natural Gas
Minimum Maximum
power fan power fan
speed (P2) speed (P1)
3) 3)
17 48
3) 3)
17 48
3) 3)
17 48
3) 3)
17 49
Installation instructions | 23
Liquid
propane
Maximum
power fan
speed (P1)
52* For operation at
elevations above
53*
2,000 ft (610 m) the
equipment ratings
52*
shall be reduced at
53*
the rate of 4% for
each 1,000 ft (305
53*
m) above sea level
53*
53*
53*
Liquid
propane
Maximum
power fan
speed (P1)
3) 3)
48
3) 3)
48
3) 3)
48
3) 3)
49
6 720 805 440 (2014/11)