Bosch C 1210 ES/ESC Manual page 21

4.3.7 Fan speed adjustment
! IMPORTANT INFORMATION:
Natural gas heaters with installation altitudes below 2,000 ft above sea
level disregard this section.
Installation adjustment:
After installing the tankless water heater, the fan speed values for
minimum power (P2) and maximum power (P1) may need adjustment
due to variations in altitude and vent pipe length. Failure to make
necessary adjustments to fan speed values may result in improper
operation of the appliance.
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 21 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 22 Fan speed adjustment for 4" piping
1) Full equivalent length (inlet + outlet piping + fittings)
C 1210 ES/ESC
Natural Gas
Minimum
Total equivalent vent
power fan
1)
length
speed (P2)
6 - 25 ft 12
26 - 46 ft 12
6 - 37 ft 12
38 - 62 ft 12
6 - 25 ft 12*
26 - 46 ft 13*
6 - 37 ft 12*
38 - 62 ft 13*
6 - 25 ft 13*
26 - 46 ft 13*
6 - 37 ft 13*
38 - 62 ft 13*
Natural Gas
Minimum
Total equivalent vent
power fan
1)
length
speed (P2)
3.5 - 39 ft 12
40 - 86 ft 12
3.5 - 59 ft 12
60 - 126 ft 12
3.5 - 39 ft 12*
40 - 86 ft 13*
3.5 - 59 ft 12*
60 - 126 ft 13*
3.5 - 39 ft 13*
40 - 86 ft 13*
3.5 - 59 ft 13*
60 - 126 ft 13*
First calculate the total equivalent vent length. This is the straight pipe
length of both exhaust and combustion air plus the number of elbows
used. To determine the length equivalency of each elbow refer to tables
8 and 9.
Use the equivalent vent length value to determine the appropriate fan
speed values found in table 21 and 22. Refer to page 22 on how to adjust
the fan speeds if an adjustment is necessary. After changing fan speed
values, proceed to chapter 7.5 to confirm CO
specified ranges.
Liquid
propane Natural Gas
Minimum Maximum
power fan power fan
speed (P2) speed (P1)
12
13
12
14
14*
No
14*
modification
13*
required
14*
14*
15*
14*
15*
Liquid
propane Natural Gas
Minimum Maximum
power fan power fan
speed (P2) speed (P1)
12
13
12
14
14*
14* No
modification
13*
required
14*
14*
14*
14*
15*
Installation instructions | 21
values are within
2
Liquid
propane
Maximum
power fan
speed (P1)
For operation at
elevations above
2,000 ft (610 m)
the equipment
ratings shall be
reduced at the rate
of 4% for each
No
1,000 ft (305 m)
modification
above sea level
required
Liquid
propane
Maximum
power fan
speed (P1)
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
No
modification
required
6 720 644 887 (2013/02)