Marstair A2LCELLARMATCH, Technical Manual

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Installation of an A2L Split Cellar System
Prior to installation, it is important to ensure that the location is suitable for this type of system and that the instructions
have been followed with regard to the minimum room volume for the maximum charge weight. This assessment
process is designed to augment a detailed risk assessment not replace it.
The A2L DSEAR Assessment has identified that if a cellar split system (typically less than 3kg refrigerant charge), is
located correctly in accordance with the instructions, then the most likely point of leakage is a flare connection on the
condensing unit, which will be located in free air outside. This will result in Zone 2 NE.
BS EN 60079-10-1 states that this zone may be treated as non-hazardous. Such a zone implies that an explosion, if it
takes place, will have negligible consequences.
The following step by step assessment assumes that the site in which you are working has no specific risks or
hazards. If this is not the case, a full assessment will be required
INSTALLATION
Question N/A YES NO Comments
1. Has correct PPE been selected? If yes go to question 2
If no stop assessment
2. Are suitable first aid facilities available? If yes go to question 3
If no stop assessment
3. Has the electrical supply been suitably isolated? If yes go to question 4
If no rectify and reassess
4. Are hot works required for jointing of the
refrigeration pipework? If yes go to question 7
If no go to question 5
5. Are permanent mechanical joints required? If yes go to question 20
If no go to question 6
6. Have the flare connections been made to a
suitable standard? If yes go to question 20
If no rectify and reassess
7. Are you competent to carry out brazing tasks? If yes go to question 8
If no stop assessment
8. Brazing certificate number
9. Has a suitable fire extinguisher been selected
and a hot work permit been issued? If yes go to question 10
If no stop assessment
10. Is the area adequately ventilated? If yes go to question 11
If no stop assessment
11. Are the pressure regulators in date? If yes go to question 12
If no rectify and reassess
12. Are the flash back arrestors in date? If yes go to question 13
If no rectify and reassess
13. Has the oxyfuel equipment been leak tested? If yes go to question 14
If no rectify and reassess
14. Has the Oxygen Free Nitrogen equipment been
leak tested? If yes go to question 15
If no rectify and reassess
15. Are all the cylinders upright and secure? If yes go to question 16
If no rectify and reassess
16. Is Oxygen Free Nitrogen purging at the correct
flow rate through the pipework? If yes go to question 17
If no rectify and reassess
17. Has a full shutdown of equipment been
completed upon conclusion of hot works If yes go to question 18
If no rectify and reassess
18. Is a fire watch to be undertaken? If yes go to question 19
If no rectify and reassess
19. Duration of fire watch
7
– INSTALLATION RISK ASSESSMENT