How To Process Tubing - Panasonic S-22MU1E5 Instrucciones De Instalación

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E1 type (73, 106, 140)
Functional ground screw (External Electronic
Expansion Valve Kit and Schedule Timer)
Use this screw when connecting the shield
for the Inter-unit control wiring to ground.
Remote Control Wiring
Inter-unit Control Wiring
Clamping Clip
Protective ground screw (External
Solenoid Valve Kit for 3WAY)
Y1 type
Functional ground screw (External Electronic
Expansion Valve Kit and Schedule Timer)
Use this screw when connecting the shield
for the Inter-unit control wiring to ground.
Protective ground screw (External
Solenoid Valve Kit for 3WAY)
Remote Control Wiring
Power Supply
Inter-unit Control Wiring
Clamper
(Field supply)
E1 type (224, 280)
Use this screw when connecting the shield
for the Inter-unit control wiring to ground.
Remote Control
Inter-unit
Wiring
Control Wiring
Power
Supply
Functional ground screw (External Electronic
Expansion Valve Kit and Schedule Timer)
M1 type
Clamper inside the box for
Remote Control Wiring and
Inter-unit Control Wiring
Inter-unit Control Wiring
Remote Control Wiring
L N U1 R1R2 U2
Clamping Clip
Clamper on the front
Use this screw when connecting the
side for Power Supply
shield for the Inter-unit control wiring
Protective ground screw (External
to ground.
Solenoid Valve Kit for 3WAY)
Functional ground screw (External Electronic
Expansion Valve Kit and Schedule Timer)
Inter-unit Control Wiring Remote Control Wiring
Wire Saddle
Supplied Clamper *
Power Supply
* Route the power supply cord through the ring
of the supplied wire saddle and clamp the cord.
F1 type
Protective ground screw (External Solenoid Valve Kit for 3WAY)
Functional ground screw (External Electronic
Expansion Valve Kit and Schedule Timer)
L N U1 U2 R1 R2
Use this screw when
connecting the shield
for the Inter-unit control
wiring to ground.
Remote Control Wiring
Power Supply
Inter-unit Control Wiring
41
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5. HOW TO PROCESS TUBING

The liquid tubing side is connected by a fl are nut, and the gas
tubing side is connected by brazing.
5-1. Connecting the Refrigerant Tubing
Use of the Flaring Method
Many of conventional split system air conditioners employ the
flaring method to connect refrigerant tubes that run between
indoor and outdoor units. In this method, the copper tubes are
flared at each end and connected with flare nuts.
Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a tube
cutter. It is recommended to cut approx. 30 – 50 cm longer
than the tubing length you estimate.
(2) Remove burrs at each end of the copper tubing with a
tube reamer or file. This process is important and should
be done carefully to make a good flare. Be sure to keep
any contaminants (moisture, dirt, metal filings, etc.) from
entering the tubing. (Figs. 5-1 and 5-2)
Deburring
Before After
Fig. 5-1
NOTE
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 5-2)
(3) Remove the flare nut from the unit and be sure to mount it
on the copper tube.
(4) Make a flare at the end of the copper tube with a flare tool.
(Fig. 5-3)
Flare tool
NOTE
A good flare should have the following characteristics:
● inside surface is glossy and smooth
● edge is smooth
● tapered sides are of uniform length
Caution Before Connecting Tubes Tightly
(1) Apply a sealing cap or water-proof tape to prevent dust or
water from entering the tubes before they are used.
(2) Be sure to apply refrigerant lubricant (ether oil) to the
inside of the flare nut before making piping connections.
This is effective for reducing gas leaks. (Fig. 5-4)
Apply refrigerant lubricant.
(3) For proper connection, align the union tube and flare tube
straight with each other, then screw on the flare nut lightly
at first to obtain a smooth match. (Fig. 5-5)
Union
Copper
● Adjust the shape of the liquid tube using a tube bender at the
tubing
installation site and connect it to the liquid tubing side valve
using a flare.
Reamer
Cautions During Brazing
● Replace air inside the tube with nitrogen gas to prevent
Fig. 5-2
copper oxide film from forming during the brazing
process. (Oxygen, carbon dioxide and Freon are not
acceptable.)
● Do not allow the tubing to get too hot during brazing.
The nitrogen gas inside the tubing may overheat,
causing refrigerant system valves to become damaged.
Therefore allow the tubing to cool when brazing.
● Use a reducing valve for the nitrogen cylinder.
● Do not use agents intended to prevent the formation
of oxide film. These agents adversely affect the
Flare nut refrigerant and refrigerant oil, and may cause damage or
malfunctions.
Copper
tubing
5-2. Connecting Tubing Between Indoor and
Outdoor Units
(1) Tightly connect the indoor-side refrigerant tubing extended
from the wall with the outdoor-side tubing.
Fig. 5-3
Indoor Unit Tubing Connection (
Indoor unit type 22 28 36 45 56 73 90 106 140 160
Gas tubing (mm) ø12.7
Liquid tubing (mm) ø6.35
(2) To fasten the flare nuts, apply specified torque.
●
When removing the flare nuts from the tubing connections,
or when tightening them after connecting the tubing, be sure
to use 2 adjustable wrenches or spanners. (Fig. 5-6)
If the flare nuts are over-tightened, the flare may be damaged,
which could result in refrigerant leakage and cause injury or
asphyxiation to room occupants.
Torque wrench
Indoor unit
42
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Fig. 5-4
Flare nut
Fig. 5-5
, ... )
1 2 n-1
ø15.88
ø9.52
Spanner
Outdoor unit
Fig. 5-6