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Piping installation
Installer and user reference guide
85
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
15.3.3 To cut off the spun pipe ends
When the product is shipped, a small amount of refrigerant gas is kept inside the
product. Therefore, the pipes contain a pressure higher than the atmospheric
pressure. For safety reasons, it is necessary to release the refrigerant before
cutting the spun pipe ends.
WARNING
Any gas or oil remaining inside the stop valve may blow off the spun piping.
If these instructions are NOT followed correctly it may result in property damage or
personal injury, which may be serious depending on the circumstances.
1
Open stop valves CsV3 (gas) and CsV4 (liquid). See
80].
2
In case the outdoor unit is installed indoors: install a pressure hose to service
ports SP3, SP7 and SP11. Check that the hoses are properly fixed and that they
lead outside.
3
Fully open service ports SP3, SP7 and SP11 to release the refrigerant. See
"15.2.5 To handle the service port"
81]. All refrigerant must be evacuated
before continuing.
4
Cut off the lower part of the gas and liquid stop valve pipes along the black
line. Always use appropriate tools, such as a pipe cutter or pair of nippers.
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
5
Wait until the oil has dripped out of the piping. All oil must be evacuated
before continuing.
6
Close stop valves CsV3 and CsV4 and service ports SP3, SP7 and SP11.
7
Connect the field piping to the cut pipes.