A.O. Smith BTI 85 G - Manual (Page 19)

19
2.7 Converting to another
type of gas
For conversion of the appliance from
natural gas to another type of gas, or
visa versa, it is necessary to exchange
the pilot injector and the main injector.
The conversion may only be executed
by a qualfied competent person.
Procedure:
1. Shut the heater down. Close the
main inlet gas valve and switch off
the electricity supply at the main
switch;
2. Remove the burner assembly;
3. Replace the injectors with the cor-
rect injectors from the conversion
set. (see table below).
Remark:
-
When conversion of the appliance
from natural gas to another type of
gas, fix the screw on the gas block
of the burner pressure control as
far as the stop.
- When conversion of the appliance
from another type of gas to natural
gas, then the right burner pressure
should be adjust.
unit BTI 85 BTI 100
G20 G30 G31 G20 G30 G31
Supply pressure mbar 20 30 37 20 30 37
Burner pressure mbar 11.5 30 37 10.0 30 37
Diameter main injector mm 3.90 2.30 2.30 4.50 2.35 2.35
Diameter pilot injector mm 0.56/ 0.23 0.23 0.56/ 0.23 0.23
0.41 0.41
2.8 Maintenance
To ensure safe and efficient operation
of the water heater it is recommended
that it is cleaned and serviced at least
once a year by a qualified competent
person.
2.8.1 Magenesium anode
The life cycle of the anode is
determined by the quality and the
quantity of the water flowing through
the water heater. It is therefore
recommended that the anode be
inspected and replaced if necessary at
least once a year.
1. Close the stop cock in the cold water
supply pipe;
2. Open the nearest hot water tap in
order to allow the pressure to drop
from the water heater and the pipes;
3. Slacken the anode with a fitting
wrench;
4. Check the anode and replace it if it
has been reduced in diameter by
60% or more at any point on its
lenght;
5. Check for water leaks.
If is necessary to replace the anode it
should be replaced by one of the same
type. The type of anode required can be
detemined on the basis of the type of
the appliance and the serial number.