Check Points Before Commissioning; Preparing The Boiler For Commissioning; Gas Circuit - DeDietrich MCA Pro 45 Installation And Service Manual

5. Commissioning

5.2 Check points before commissioning

5.2.1. Preparing the boiler for commissioning

WARNING
Do not put the boiler into operation if the supplied
gas is not in accordance with the approved gas types.
Preparatory procedure for boiler commissioning:
• Check that the gas type supplied matches the data
shown on the boiler's rating plate.
• Check the gas circuit.
• Check the hydraulic circuit.
• Check the water pressure in the heating system.
• Check the electrical connections to the thermostat
and the other external controls.
• Check the other connections.
• Test the boiler at full load. Check the setting of the
gas/air ratio and, if necessary, correct it.
• Test the boiler at part load. Check the setting of the
gas/air ratio and, if necessary, correct it.
• Finalizing work.
i
Complete the checklist.

See chapter: "Checklist for
commissioning", page 113.

5.2.2. Gas circuit

WARNING
Ensure that the boiler is switched off.
1. Open the main gas supply.
2. Open the gas shutoff valve on the boiler.
3. Unscrew the two screws located under the front
panel by a quarter turn and remove the panel.
4. Tilt the control box forwards by opening the holding
clips located at the sides.
5. Check the gas supply pressure at the pressure
outlet C on the gas valve unit.
WARNING

To ascertain the gas types permitted, see
chapter: "Gas type", page 13
6. Check the tightness of the gas connections made
after the gas valve unit in the boiler.
7. Check the tightness of the gas line, including the
gas valves. The test pressure must not exceed
0.87 psig/60 mbar.
8. Purge the gas supply pipe within the boiler by
unscrewing the pressure outlet on the gas block.
Tighten the measurement point when the pipe has
been sufficiently purged.
9. Check the tightness of the gas connections in the
boiler.
66
MCA Pro 45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017