Bosch C 950 - Page 23

Installation instructions | 23
6 720 805 440 (2014/11)Greentherm
C950ES Fan Speed Adjustment
Natural Gas
Liquid
propane Natural Gas
Liquid
propane
Altitude (above
sea level)
Vent
terminal
Total equivalent vent
length
1)
Minimum
power fan
speed (P2)
Minimum
power fan
speed (P2)
Maximum
power fan
speed (P1)
Maximum
power fan
speed (P1)
0 - 2000 ft
(0 - 610 m)
Concentric 3.5 - 39 ft No modification required on installations below 2000 ft Altitude
40 - 86 ft
Twin
system
3.5 - 59 ft
60 - 126 ft
2000 - 4500 ft
(610 - 1372 m)
Concentric 3.5 - 39 ft 11* 14* 52* 52* For operation at
elevations above
2,000 ft (610 m) the
equipment ratings
shall be reduced at
the rate of 4% for
each 1,000 ft (305
m) above sea level
40 - 86 ft 11* 14* 53* 53*
Twin
system
3.5 - 59 ft 10* 13* 52* 52*
60 - 126 ft 11* 14* 53* 53*
4500 - 8000 ft
(1372 - 2439 m)
Concentric 3.5 - 39 ft 11* 14* 53* 53*
40 - 86 ft 13* 16* 53* 53*
Twin
system
3.5 - 59 ft 11* 14* 53* 53*
60 - 126 ft 12* 15* 53* 53*
* 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)
Natural Gas
Liquid
propane
Natural Gas
Liquid
propane
Altitude (above sea
level)
Vent
terminal
Total equivalent vent
length
1)
1) Full equivalent length (inlet + outlet piping + fittings)
Minimum
power fan
speed (P2)
Minimum
power fan
speed (P2)
Maximum
power fan
speed (P1)
Maximum
power fan
speed (P1)
0 - 2000 ft
(0 - 610 m)
Twin
system
3.5 - 11 ft 12
3)
17
3)
48
3)
48
3)
12 - 19 ft 12
3)
17
3)
48
3)
48
3)
2000 - 4500 ft
2)
(610 - 1372 m)
2) When installing in altitude, the unit may not reach the rated Input
Twin
system
3.5 - 11 ft 13
3)
17
3)
48
3)
48
3)
12 - 19 ft 13
3)
3) When adjusting the unit, CO2 levels must be checked with a combustion gas analyzer, see chapter 7.5 for instructions.
17
3)
49
3)
49
3)
Table 31 C950ES Fan speed adjustment for 2" piping