3.2. INSTALLATION POSITION
1. Horizontal Installation
Locate the branch pipes on the same horizontal plane.
(Inclination within 30º)
Make the straight length a minimum of 0.5m after the vertical bend.
2. Vertical Installation
Straight length of the pipe connection on the outdoor unit side is made as
follows:
a) The collective pipe connection part is installed upward, the straight
length must be min. 0.5m.
b) The collective pipe connection part is installed downward, the straight
length must be min. 0.3m.
3.3. CONNECTION PROCEDURE FOR PIPING JOINT
When connecting liquid piping for the unit with a capacity 2.0HP or smaller,
and with the length of piping is 15 meters or longer, apply the piping size of
Ø9.53mm.
Fix the connecting pipe as shown in the below figure.
Use the insulation attached to the indoor unit.
3.4. PIPING CONNECTION
1. Use clean copper pipes without any moisture or foreign materials on inner
surface of pipes. When connecting refrigerant pipe, cut the copper pipes
with a pipe cutter as shown below.
Also blow the pipes with nitrogen or air to remain no dust inside the pipe.
Do NOT use a saw, a grindstone or others which causes a large amount
of cutting powder.
2. When cutting the pipe, secure the adequate depth for brazing as shown in
the following table.
(mm)
A: Outer Diameter B: Minimum depth
Over 5, below 8 6
Over 8, below 12 7
Over 12, below 16 8
Over 16, below 25 10
Over 25, below 35 12
Over 35, below 45 14
CAUTION for Refrigerant Piping:
3. Make sure that the stop valves are closed completely.
4. Blow the inside of the pipes with nitrogen when brazing.
DANGER:
Check for the refrigerant leakage in detail. If a large refrigerant leakage
occurs, it will cause difficulty with breathing or harmful gases would
occur if a fire were being used in the room.
5. The airtight test pressure of this product is 4.15MPa.
6. Apply the insulation supplied with these multi-kits to each branch (liquid
side and gas side) with a tape. Also apply the field-supplied insulation to
the field-supplied pipes.
NOTE:
When polyethylene foam is applied, a thickness of 10mm for the liquid
piping and 15mm to 20mm for the gas piping is recommended. (Use
insulation for gas piping with a heat resistance of 100
C).
CAUTION:
-When the temperature of the piping decrease to room temperature,
perform insulation work. If insulation work is performed immediately
after brazing, insulation can melt.
-If the ends of piping system are open to the atmosphere for a while
after accomplishing piping work, securely put caps or vinyl bags to
the ends of the piping, avoiding the intrusion of moisture and dust.
-After installing work has been finished, it is recommended to keep
this manual by a customer.
GB, PMML0210A rev.1 - 01/11
Horizontally
Upward
Downward
INCORRECT
Inclination
within 30º
Inclination
(View from A)
Upward
Expander for Liquid Line (Accessory)
Flare the pipe after inserting the flare nut
Use the flare nut of the indoor unit Fix this part with the attached cord band
or field-supplied vinyl tape
Insulate this part with the
attached insulation
Field-supplied Refrigerant Piping
Field-supplied Insulation
Brazing
Insulation attached to indoor unit
Pipe Cutter
Pipe
Connection
Part
Burring
Downward
B
A
When installing pipe through the wall,
secure a cap at the end of the pipe.
Attach a cap
or vin
l ta
eCORRECT
INCORRECT
Attach a cap
or vin
l ta
e
CORRECT INCORRECT
Do NOT place the pipe directly on
the ground.
Attach a cap
or vinyl tape
with rubber
band
CORRECT INCORRECT
Rain water
can enter
Insulation (Field-supplied)
Do NOT leave a gap
between the insulation
Insulation for Gas and
Liquid Line (Accessory)
Fix the insulation with
tape (accessory) completely
after ta
in
tem
orar
Indoor
Unit
0.5m
CORRECT
Straight Length
Min. 0.3m
Straight Length
Min. 0.5m
