Bosch GWH 2400 ES NG Manual page 25

HIGH ALTITUDE OPERATION
The maximum fan speed setting (P1) may need to be adjusted depending on the altitude of the installation. (see Table
14). If the P1 fan speed is changed, CO2 levels must be checked and confirmed with a combustion gas analyzer (see
chapter 6.4 page 31, for details).
Altitude
(above sea Vent
level) terminal
0 - 2000 ft Twin
(0 - 610 m) system
2000 - 4500 ft Twin
(610 - 1372 m) system
4500 - 8000 ft Twin
(1372 - 2439 m) system
Table 14 Fan speed adjustment
1) Full equivalent length (inlet + outlet piping + fittings. See Table 4)
Adjusting maximum power fan speed P1
To select fan speed:
B Press ON/OFF button into OFF.
B Press and hold "Program" button and press ON/OFF
button to turn appliance ON.
Fig. 34
B As soon as '188' is displayed, release "Program" but-
ton , and the display reads P2.
B Press the minus button to display P1.
B Press "P" program button to enter P1 adjustment.
The current setting will appear on the display.
B Press + or - to choose the fan speed suitable with
your installation, see Table 14.
B Press and hold (± 5 sec.) "Program" button until the
display flashes, then the selected value is memorized
Proceed directly to Section 6.4 to confirm
i
CO2 values are within range.
6 720 608 782
Natural Gas
Pipe
1)
length Fan speed
3 - 32 ft
No
modification
33 - 52 ft
3 - 32 ft 40
33 - 52 ft 41
3 - 32 ft 41
33 - 52 ft 41
Liquid propane
Fan speed
No
modification
CO adjustment with flue gas analyzer required,
2
6.4
see section for instructions.
Not approved
Installation instructions
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
25