Setting The Air Valve - A.O. Smith COF 199 Installation, User And Service Manual

1.3.7 Setting the air valve

1.3.7 Setting the air valve
This section is applicable for heaters equipped with either This section is applicable for heaters equipped with either
gas-fired burners or oil-fired burners. gas-fired burners or oil-fired burners.
The air valve is set as a function of the water heater's The air valve is set as a function of the water heater's
required flow rate. During the commissioning of the water required flow rate. During the commissioning of the water
heater, the position of the air valve must be set to the heater, the position of the air valve must be set to the
value stated in the table below. Please refer also to the value stated in the table below. Please refer also to the
burner's instruction manual. burner's instruction manual.
The setting of the air valve for Riello front-mounted The setting of the air valve for Riello front-mounted
burners is as follows: burners is as follows:
UNIT
UNIT UNIT
COF 199 COF 199
COF 199
COF 245 COF 245
COF 245
COF 315
COF 315 COF 315
COF 385
COF 385 COF 385
COF 455
COF 455 COF 455
COF 700
COF 700 COF 700
The values above are recommended settings and have The values above are recommended settings and have
been determined under laboratory conditions. been determined under laboratory conditions.
Make sure that the CO Make sure that the CO figure is lower than 10% for G20 figure is lower than 10% for G20
2 2
and G25, and lower than 12% for G30 and G31. A and G25, and lower than 12% for G30 and G31. A
maximum CO maximum CO figure of 12.5% applies to oil. If the CO figure of 12.5% applies to oil. If the CO
2 2
figure does not meet the requirements after the air valve figure does not meet the requirements after the air valve
has been set, the latter must be readjusted. has been set, the latter must be readjusted.
14 14
14
Notch number.....in airvalve
Notch number ... in burner head Notch number ... in burner head
Gas-fired burner
Gas-fired burner Gas-fired burner
GAS G20 GAS G25
GAS G20 GAS G20 GAS G25 GAS G25
1.6 1.6 1.7 1.7
1.6 1.7
2.1 2.1 2.5 2.5
2.1 2.5
1.9 1.8
1.9 1.9 1.8 1.8
2.9 2.9
2.9 2.9 2.9 2.9
3.1 3.1
3.1 3.1 3.1 3.1
5.2 5
5.2 5.2 5 5
2 2
GAS G30 GAS G31
GAS G30 GAS G30 GAS G31 GAS G31
1.9 1.9 1.6 1.6
1.9 1.6
2.3 2.3 2.1 2.1
2.3 2.1
1.5 1.5
1.5 1.5 1.5 1.5
2.5 2.5
2.5 2.5 2.5 2.5
3 3
3 3 3 3
4.2 4.2
4.2 4.2 4.2 4.2
Oil-fired
Oil-fired Oil-fired
burner
burner burner
2.4 2.4
2.4
3.5 3.5
3.5
1.7
1.7 1.7
2.7
2.7 2.7
3
3 3
3.5
3.5 3.5