Precautions For Installation Using New Refrigerant - Panasonic U-4LE1E5 Installation Instructions Manual

Precautions for Installation Using New
Refrigerant
1. Care regarding tubing
1-1. Process tubing
● Material: Use C1220 phosphorous deoxidized copper
specified in JIS H3300 "Copper and Copper Alloy Seamless
Pipes and Tubes".
● Tubing size: Be sure to use the sizes indicated in the
table below.
● Use a tube cutter when cutting the tubing, and be sure to
remove any flash. This also applies to distribution joints
(optional).
● When bending tubing, use a bending radius that is 4 times
the outer diameter of the tubing or larger.
CAUTION
Use sufficient care in handling the tubing. Seal the tubing ends
with caps or tape to prevent dirt, moisture, or other foreign
substances from entering. These substances can result in
system malfunction.
Material
Outer diameter
Copper
tube
Wall thickness
1-2. Prevent impurities including water, dust and oxide from
entering the tubing. Impurities can cause R410A refrigerant
deterioration and compressor defects. Due to the features
of the refrigerant and refrigerating machine oil, the
prevention of water and other impurities becomes more
important than ever.
2. Be sure to recharge the refrigerant only in liquid form.
2-1. Since R410A is a non-azeotrope, recharging the refrigerant
in gas form can lower performance and cause defects of
the unit.
2-2. Since refrigerant composition changes and performance
decreases when gas leaks, collect the remaining
refrigerant and recharge the required total amount of new
refrigerant after fixing the leak.
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.
AMP Air Conditioning
Unit: mm
O
6.35 9.52 12.7 15.88 19.05
0.8 0.8 0.8 1.0 1.2
R407C
tools
New
Item compatible
tool?
with
R410A?
Manifold Yes
gauge
Charge Yes
hose
Vacuum Yes
pump
Leak Yes
detector
Flaring oil Yes
* Using tools for R22 and R407C and new tools for R410A
together can cause defects.
Manifold gauge
3-2. Use R410A exclusive cylinder only.
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be
recharged with the cylinder
standing on end as shown.
5
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Remarks
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 detectors
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.
Vacuum pump
Outlet
Inlet
Valve
Liquid