LG THERMA V HN0613T Installation Manual page 17

- Evacuate (optional for A2L);
- Purge with inert gas (optional for A2L);
- Open the circuit by cutting or brazing
The refrigerant charge shall be recovered into the correct
recovery cylinders. For appliances containing flammable
refrigerants other than A2L refrigerants, the system shall be
purged with oxygen-free nitrogen to render the appliance safe
for flammable refrigerants. This process may need to be
repeated several times.
Compressed air or oxygen shall not be used for purging
refrigerant systems.
For appliances containing flammable refrigerants, other than
A2L refrigerants, refrigerants purging shall be achieved by
breaking the vacuum in the system with oxygen-free nitrogen
and continuing to fill until the working pressure is achieved,
then venting to atmosphere, and finally pulling down to a
vacuum. This process shall be repeated until no refrigerant is
within the system. When the final oxygen-free nitrogen charge
is used, the system shall be vented down to atmospheric
pressure to enable work to take place. This operation is
absolutely vital if brazing operations on the pipe-work are to
take place.
Ensure that the outlet for the vacuum pump is not close to any
potential ignition sources and that ventilation is available.
CAUTION
!
Installation
• Always check for gas (refrigerant) leakage after installation or
repair of unit.
- Low refrigerant levels may cause failure of unit.
• Keep level even when installing the unit.
- To avoid vibration or water leakage.
SAFETY INSTRUCTIONS
17