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2. Guideline for each installation process
2.8 Additional charge of refrigerant
2.8.1 Refrigerant charging instructions
① The results of all calculations must be recorded. (make a list)
② The refrigerant will need to be additionally charged when the distance between the outdoor Unit and the most distant
indoor unit is more than length (refer to section 8 outdoor unit installation condition)
③ The additional charging operation should be carried out by input of liquid into the liquid pipes from a charging cylinder fol-
lowing completion of the Vacuum drying operation.
④ When the additional charging operation cannot be satisfactorily completed , use the action of the compressor to com-
plete the additional charging during the test run.
R-410A is a non-azeotrope refrigerants. Therefore , these refrigerants must be charged in the Liquid state.
When charging the refrigerant into equipment from the cylinder , turn the refrigerant cylinder upside down.
NOTE
Make sure that the refrigerant (liquid) is taken out from the bottom part of the refrigerant cylinder.
Do not take out the refrigerant (gas) at the upper of the refrigerant cylinder for charging.
Refrigerant
cylinder
CAUTION
• Since some refrigerant cylinders differ in the internal mechanism, it is necessary to examine the cylinder carefully.
(Some cylinders have a siphon tube to eliminate the need for turning it upside down)
Outdoor unit A
Outdoor unit B
Refrigerant
cylinder
siphon tube
Heat pump
_ 34
50Hz/R410A
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