Daikin SkyAir Super Inverter 70 D Series Service Manual page 114

SiE25-110
Cautions in Brazing
working with the
new refrigerant
Flaring
Refrigerant charge
Air tight test
Caution Be sure to conduct service work strictly following the contents mentioned above.
Conducting service work in improper methods can cause equipment trouble.
Troubleshooting
The new refrigerant required very stringent cares to prevent the intrusion of impurities.
Therefore, a nitrogen gas must be supplied into the pipe during brazing.
Ensure to carry out proper protection covering work for refrigerant pipes and vacuum drying,
and also exercise more thorough process control on the new refrigerant than on the previous
refrigerant to prevent the intrusion of impurities into pipes even in other processes than
brazing.
Carry out thorough deburring (filing) on the cut sections. Pay utmost care to prevent chips
from remaining in the pipes.
Apply an appropriate amount of oil on the inside and outside of the flared section. Be sure to
use refrigerant oil or synthetic oil (ether-base oil, ester-base oil, alkylbenzene-base oil, or
mixed oil of these oils).
Charge the new refrigerant in the liquid state through the service port of stop valve on the
liquid side (outdoor unit). Conduct vacuum drying using vacuum pump, and never conduct
flushing during refrigerant charging.
An air tight test for equipment must be conducted.
Maintenance Inspections
105