Sanyo SAP-KRV91EH Technical & Service Manual page 38

Tubing precautions
Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily
cover the ends of the tubing with caps or tape prior to installation.
Never use 0.7mm-thick copper pipe or pipes which are less than 0.8mm in thickness, since air conditioners
with R410A are subject to higher pressure than those using R22 and R407C.
Diameter of narrow tube Diameter of wide tube
ø6.35 (1/4") 2 minutes ø9.52 (3/8") 3 minutes
No addition of compressor oil for R410A
No additional charge of compressor oil is permitted.
No use of refrigerant other than R410A
Never use a refrigerant other than R410A.
If refrigerant R410A is exposed to fire
Through welding, etc., toxic gas may be released when R410A refrigerant is exposed to fire. Therefore, be
sure to provide ample ventilation during installation work.
Caution in case of R410A leak
Check for possible leak points with the special leak detector for R410A. If a leak occurs inside the room, imme-
diately provide thorough ventilation.
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