Atmos Energy InterCombi HE32 User Manual download pdf (Page 43)

13. Exit the test mode by simultaneously pressing the “+” and “–“ buttons on the

operating panel. Replace the dust cap (A) and close the flue gas measuring

nipple.

14. Remount the front cover of the appliance.

Caution: Check the measuring nipples used for gas tightness.

Caution: On windy days or on installations with a long flue run it is necessary to

replace the front cover of the boiler in order to obtain an accurate CO

measurement

Setting the gas valve by pressure measurement

This method is less accurate, but usually gives a sufficient result.

1. Switch off the appliance using the On/Off button (

- on service display).

2. Remove the front cover of the appliance.

3. Turn the measuring nipple (C) on the gas valve open with two turns and connect

this through a tube to the plus connection of the pressure gauge.

4. Switch on the appliance using the On/Off button.

5. Set the boiler to the lowest output by simultaneously pressing the “Service” and

“–“ buttons on the operating panel until an

L appears on the service display.

6. Read the pressure. This should be about -5 Pa or -0.05 mBar (min. –10 Pa,

max. 0 Pa. or min.–0,1 mBar, max. 0 mBar). When this is not the case, proceed

as follows for setting:-

7. Remove the dust cap (A) with a torx T15 driver.

8. Set the pressure using setting screw (B) (clockwise higher and counter-

clockwise lower).

9. After measuring and setting, replace the cover cap A and close the measuring

nipple (C) again.

10. Remount the front cover of the appliance.

Caution: Check the measuring nipples used for gas tightness.

7.10 Carbon monoxide : carbon dioxide ratio

Atmos recommends that a carbon dioxide : carbon monoxide ratio test is carried out

when the boiler is commissioned. This is best done when the CO

content of the flue

gasses is measured. See the procedure described in § 7.9.

1. Set the boiler to the lowest output by simultaneously pressing the “Service” and

“–“ buttons on the operating panel until an

L appears on the service display.

2. Measure the CO/CO

ratio.

3. Set the boiler to the high output by simultaneously pressing the “Service” and “+“

buttons (twice) on the operating panel until an

H appears on the service

display.

4. Measure the CO/CO

ratio

The CO/CO

ratio at low or high output should be no higher than 0.004.

A CO/CO

ratio between 0.004 and 0.008 means that the appliance is ‘At Risk’ (AR).

A CO/CO

ratio above 0.008 means that the appliance is ‘Immediately Dangerous’

(ID)

Where an ‘at risk’ or ‘immediately dangerous’ situation is encountered, measures

must be undertaken to rectify the situation. Particular attention should be given to

the gas/air ratio, the integrity of the flue, or blockage in the heat exchanger. Contact

the manufacturer for assistance.

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Atmos Energy InterCombi HE32 User Manual Page 43

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