Use new refrigerant pipes.
Keep the inner and outer surfaces of the pipes
clean and free of such contaminants as sulfur,
oxides, dust, dirt, shaving particles, oil, and
water.
In addition, use pipes with specified thickness.
Store the pipes to be installed indoors, and keep
both ends of the pipes sealed until immediately
before brazing. (Keep elbows and other joints
wrapped in plastic.)
Use a small amount of ester oil, ether oil, or
alkylbenzene to coat flares and flanges.
In case of using the existing pipes for R22, be careful with
the followings.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge liquid refrigerant (as opposed to gaseous
refrigerant) into the system.
If gaseous refrigerant is charged into the system, the
composition of the refrigerant in the cylinder will change
and may result in performance loss.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse-flow check
valve.
Do not use refrigerant other than R410A or
R407C.
If a vacuum pump that is not equipped with a reverse-flow
check valve is used, the vacuum pump oil may flow into
the refrigerant cycle and cause the refrigerating machine
oil to deteriorate.
Prepare a set of tools for exclusive use with R407C
and another set for exclusive use with R410A.
The following tools are necessary to use R410A
or R407C
refrigerant.
Exercise special care when handling the tools for
use with R407C.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of the
refrigerant will change, and the unit may experience power
loss.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A or R407C
These types of contaminants inside the refrigerant pipes
may cause the refrigerant oil to deteriorate.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate or
cause the unit to malfunction.
Infiltration of a large amount of mineral oil may cause the
refrigerating machine oil to deteriorate.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
[1] Cautions for service
(1) Perform service after collecting the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A or R407C on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)