Checking And Adjusting Co2 Levels - Potterton SIRIUS FS Installation & Servicing Instructions Manual

6.3 CHECKING AND ADJUSTING CO
The gas mixture and burner gas rate is factory set. However, it is an important part of
commissioning to check the gas rate of the boiler and that the combustion emission
levels are correct.
1. Compensation line
3. Pressure measurement Point
5. Low load adjustment screw
Set CO content at max. output
2
- Place boiler in to controller stop mode (refer to section 6.3). Operate at
100% load.
- Remove safety cap from adjustment screw (2) for full load.
- Set CO
performance data (section 3.2) with a 3mm Allen key. Ensure CO levels do not
exceed 150 ppm.
- Replace safety cap on the adjusting screw (2)
Set CO content at min. output
2
- Place boiler in to controller stop mode (refer to section 6.3). Operate at 0%
load.
- Remove safety cap from adjustment screw (5) for low load.
- Set CO
performance data (section 3.2) with a TX40 Torx key. Ensure CO levels do not
exceed 150 ppm.
- Replace safety cap on the adjusting screw (2)
Note: There is a time delay between making an adjustment and the CO
changing on the gas analyser. Adjust in increments of 1/8 turn at a time and wait
at least 1 minute before making further adjustments. NB 1/2 turn = 1.0% CO
Sirius FS
content on the adjustment screw (2) for full load, according to the
2
- Clockwise: CO content is decreased
2
- anti-clockwise: CO content is increased
2
content on the adjustment screw (5) for low load, according to the
2
- Clockwise: CO content is increased
2
- anti-clockwise: CO content is decreased
2
LEVELS
2
2. Full load adjustment screw
4. Minimum gas pressure switch
39
value
2
2
GB/IE