Co 2 Adjustment - A.O. Smith SGS-28 Installation, User And Service Manual

7.9.4
0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03
Fig. Gas control valve pressure adjustment
CO adjustment
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To check the CO value under full load and partial load and to adjust it if necessary,
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proceed as follows:
1. Isolate the appliance from the power supply (see section 4.2.2).
2. Carefully remove the covers from the appliance.
3. The electrical section is now visible.
4. Place the CO meter's measurement probe in the test nipple (58) of the flue gas
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outlet pipe (the number is a reference on the General working principle of the water
heater (see section 5.1)).
5. Open the gas supply and vent the gas supply line.
6. Use the main switch to apply mains voltage to the appliance.
7. Start the appliance (see section 4.1).
8. Go to the [ ] SERVICE OPERATION menu.
9. Generate a heat demand by draining the appliance until it is cold or by raising the
value for T in the SERVICE menu. Use [ ] for this.
set
Full load measurement
10. From the service menu, select:
- SERVICE OPERATION | FULL LOAD
- Confirm with [ENTER].
The appliance is now in FULL LOAD mode and will ignite.
11. The appliance is now running at FULL LOAD. Read the value from the CO
and wait until this measured value has remained stable for some time. This may take
several minutes.
12. Then compare the measured CO
12.3).
The CO value at full load must be within ±1.0 vol% of the CO
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table.
SGS 28 to 60
13. If necessary, adjust the CO
the range listed in the table of CO
Use the Allen key supplied for this. The key can be found in the plastic bag that is
attached to the appliance.
IMD-1096b R0
value against the value from the table (see section
2
value using the adjuster screw until the value is within
2
values.
2
meter
2
value stated in the
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