Bosch 250 SXO NG - Manual (Page 12)

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Appliance details
2.9 Measuring gas pressure
2.9.1 Connecting Manometer
B Shut off gas.
B Remove front cover and locate inlet gas pressure
measuring point (see Fig. 14).
B Loosen screw inside test point fitting (do not remove)
and connect manometer tube on test point.
2.9.2 Static Pressure Test
B Turn gas supply back on.
B Operate all other gas appliances on same gas piping
system at maximum output.
B Record static gas pressure reading in table 3.
2.9.3 Operating Pressure Test
B ON/OFF switch in position OFF (0).
B Press and hold "Program" (M) button and turn ON/
OFF switch to ON position.
Fig. 13
B
As soon as '188' is displayed, release "Program"
button and the display should read P2.
B Press , until P1 appears.
Note: While in this mode the appliance will run
constantly at maximum power and allow maximum water
flow. These program modes are for test purposes only
and not intended for normal operation.
B
Turn on high volume of hot water flow (at least 6
gpm) and heater will ignite.
B Record operating gas pressure reading in table 3.
Gas pressures lower than 5" W.C. for Natural Gas or
11" W.C. for LPG will result in insufficient degree rise
to the hot water being used, and must be corrected.
See Gas Connections, chapter 2.8.
Fig. 14 Gas pressure measuring (left tapping)
HIGH ALTITUDE OPERATION
Static Gas Pressure Reading (see Chapter 2.9)
enter here: ___________________
Operating Gas Pressure Reading (see Chapter 2.9)
enter here: ___________________
Table 3
Altitude Natural
Gas:
Liquid
Propane:
0 - 4,000 ft
(0 - 1,219 m)
no
modification
no
modification
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
4,000 ft - 7,000 ft
(1,219 m - 2,134 m)
CO
2
adjustment with flue
gas analyzer required See
chapter 9 for instructions.
Above 7,000 ft
(above 2,134 m)
Not approved
Table 4