Panasonic U-26PE1U6 Technical Data & Service Manual page 5

3. Different tools required
3-1. Tool specifications have been changed due to the characteristics of R410A.
Some tools for R22- and R407C-type refrigerant systems cannot be used.
R407C tools
New
Item compatible
tool?
with R410A?
Manifold gauge Yes
Charge hose Yes
Vacuum pump Yes
Leak detector Yes
Flaring oil Yes
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
3-2. Use R410A exclusive cylinder only.
When charging with a refrigerant cylinder, use an electronic scale for charging refrigerant.
In this case, if the volume of refrigerant in the cylinder becomes less than 20% of the fully-charged amount, the
composition of the refrigerant starts to change.
Thus, do not use the refrigerant if the amount in the charging cylinder is less than 20%.
Also, charge the minimum necessary amount to the charging cylinder before using it to charge the air conditioning unit.
Configuration and characteristics of cylinders
Liquid
Single valve
Charge liquid refrigerant with
cylinder in up-side-down position.
No Types of refrigerant, refrigerating machine oil, and
pressure gauge are different.
No To resist higher pressure, material must be changed.
Yes Use a conventional vacuum pump if it is equipped
with a check valve. If it has no check valve,
purchase and attach a vacuum pump adapter.
No Leak detectors for CFC and HCFC that
react to chlorine do not function because
R410A contains no chlorine. Leak detector
for HFC134a can be used for R410A.
No For systems that use R22, apply mineral oil (Suniso oil)
to the flare nuts on the tubing to prevent refrigerant
leakage. For machines that use R407C or R410A, apply
synthetic oil (ether oil) to the flare nuts.
Valve
Fig. 1
Remarks
Single valve (with siphon tube)
Charge with cylinder in normal position.
iv
Manifold gauge
Vacuum pump
Outlet
Inlet
Valve
Liquid
Fig. 2