General Installation Procedure - Marstair A2LSYSTEMATCH SMC 15 Technical Manual

1B GENERAL INSTALLATION PROCEDURE
Carry out "step by step" or full risk assessment
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Ensure that no sources of ignition are present during installation
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Only certified natural persons should be present during the installation
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Correct selection of tools and equipment compatible with A2L refrigerants. This should include the
following:
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Flammable gas leak detector placed at a low level next to the service valves of the
condensing unit.
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If adequate natural ventilation is not present throughout the installation process, then forced
ventilation should be employed via an A2L compatible or ATEX rated fan and motor.
▪
When pressure testing through a refrigerant manifold, ensure that it is suitable for the
pressure (no sight glass fitted).
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A2L compatible 2 stage vacuum pump, exhausted to a safe well ventilated area and away
from any source of ignition (check exhaust fumes with flammable gas leak detector).
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R454C bottle adaptor (left handed female and right handed male connections DIN477-1
21.8mm LH, External, 14 T.P.I).
▪
All refrigerant hoses should be as short as possible and have self-closing or ball valve
connections in accordance with BS EN 378.
▪
If additional refrigerant is to be added, charge in liquid state and ensure a flammable gas
leak detector is positioned at a low level near the connections. (If the flammable gas leak
detector indicates the presence of a flammable atmosphere, do not energise or de-energise
any electrical components until a safe environment has been ensured.)
o
Leak checking the system in accordance with EN 1516/2017 directly after installation.
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If a leak is discovered, energise the flammable gas leak detector and place at a low level near
connections to the recovery machine and cylinder. Connect an A2L compatible recovery machine
and recover into a suitable recovery cylinder (red painted cylinder valve guard and shoulder) in
accordance with BS EN 378.
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