A.O. Smith TWI 35-200, Installation, User And Service Manual

Page: 52 / 92

Caution
When the CO
2
value is not correct, refer to General errors (see 12.1.1), CO
2
value (at full load) is not correct.
Do not use the water heater when the CO
2
value is not correct and this is not
caused by the restrictor, venturi, venting system or gas category:
• Switch off the appliance.
• Turn off the gas supply.
• Put the cover back on the water heater.
• Contact your supplier.
c
8. If necessary, use a hex driver to adjust the adjuster screw until the CO
2
value is
correct.
a)
Turn the screw anticlockwise for a higher CO
2
value.
b) Turn the screw clockwise for a lower CO
2
value.
9. If applicable, set the temperature value back to the original value.
10. Set the control switch on the front of the water heater to 0 to turn off the water
heater.
11. Remove the measurement probe of the CO
2
meter from the test nipple and place the
cap (1) back on the nipple (2).
12. Shut off the gas supply.
Fig. CO
2
value
2
1
1. Cap
2. Test nipple
8.9.5 Turn on the water heater
Refer to the procedure in the user part to Turn on the water heater (see 4.1).
8.10 Decommisioning
To decommission the water heater:
1.
Turn off the water heater (see 8.10.1)
2. Drain the water heater (see 8.10.2)
8.10.1 Turn off the water heater
Refer to the procedure in the user part to Turn off the water heater (see 4.2) and isolate
the water heater from the mains power supply.
52 Installation, Maintenance and Service part