Pipe Cleaning Work - Haier MRV II Instruction Manual

9 Pipe cleaning work

Blow nitrogen is one way to clean impurity from pipe
Note: If you did not blow nitrogen when welding pipe , this method
can not clean the oxid on the pipe wall .
Connect the nitrogen with unit system via pressure relief valve,
adjust the valve to 5Kg/cm
by hand or others , when the pipe pressure getting too high to be sealed ,
open the pipe quickly, repeat this procedure four or five times, the
impurity can be cleaned basically.
9.1 For MRV system , because the pipe is too thick , the cleaning work
should be carried segment by segment.
9.2 When cleaning the pipe , please ensure the pressure is high enough
and clean for some times, if the impurity can not be cleaned completely,
the filter in system and electric expansion valve will be clogged.
9.3 When opening the pipe please make sure to do it safely, prevent the
impurity blew out from hurting people.
2
, supply nitrogen to system, seal the pipe end
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