Basic Setting For The Gas/Air Ratio; Checks And Adjustments After Commissioning; Finalizing Work - REMEHA Calenta 25s Installation And Service Manual

High-efficiency wall-hung condensing gas boilers

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Table Of Contents

100

Table of Contents

5. Commissioning

5.5

Checks and adjustments after commissioning

/CO

Boiler type

Calenta 25s

Calenta 28c

Calenta 35s

Calenta 40c

5.4.4.

If the gas/air ratio is out of adjustment, the gas valve unit has a basic

setting. To do this, proceed as follows:

1. Cut the power supply to the boiler.

2. Close the gas valve on the boiler.

3. Remove the air inlet flue on the venturi.

4. Unscrew the top connection on the gas valve unit.

5. Disconnect the connector located under the fan.

6. Release the 2 clips holding the fan/mixing elbow unit in place on

the heat exchanger.

7. Completely remove the fan/mixing elbow unit.

¼ For steps 3 to 7 inclusive, see chapter: "Checking the burner

and cleaning the heat exchanger", page 78

8. Turn the setting screw A on the gas valve unit to modify the

position of the restrictor.

9. Turn the setting screw B on the gas valve unit anticlockwise until

it matches the front panel.

10.Turn the setting screw B on the gas valve unit by 6 turns clockwise.

11.Follow the procedure in reverse to re-assemble all of the

T001985-B

components.

5.5.1.

1. Remove the measuring equipment.

2. Put the flue gas sampling plug back in place.

3. Refit the front panel. Tighten the two screws by a quarter turn.

4. Push key > to return the boiler to normal operating mode.

5. Raise the temperature in the heating system to approximately

70°C.

6. Shut down the boiler.

7. After about 10 minutes, vent the air in the heating system.

T001522-A

8. Switch on the boiler.

control and setting values at part load for G31 (Propane)

Setting value

(%)

5,8 ± 0,3

9,9 ± 0,2

5,8 ± 0,3

9,9 ± 0,2

5,8 ± 0,3

9,9 ± 0,2

5,8 ± 0,3

9,9 ± 0,2

Repeat the high speed test and the low speed test as often

as necessary until the correct values are obtained without

having to make additional adjustments.