Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 (serv.man2) Service Manual ▷ View online
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Design of Mini VRF SYSTEM
4. Installation Instructions
Top is open:
NOTE
The amount of space is required for removing the screw on the rear of the unit.
If in case the sufficient space for maintenance is ensured on the rear of the outdoor unit,
installation is possible with the space of both sides of not less than 150mm where marked with * mark.
(1) Single-unit installation
(2) Multiple-unit installation (2 or more units)
Min.
H
or more
Min. I
or more
or more
Min. I
or more
or more
Min.
J
or more
Unit: mm
H
I
J
500
250*
1000
Unit: mm
M
N
500
300
Top is blocked by an obstacle:
Min. M
or more
or more
Min.
N
or more
[Obstacle to the front of unit]
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Design of Mini VRF SYSTEM
4. Installation Instructions
[Obstacle to the front and rear of unit]
[Installation in front-rear rows]
Q
Q
The top and both sides must remain open. Either the obstacle to the front or the obstacle to the rear
must be no taller than the height of the outdoor unit.
(1) Single-unit installation
(2) Obstacles on both sides
Installation is possible with the maximum 3 outdoor units.
Min.
P
or more
Min.
O
or more
Min. 250*
or more
or more
Min.
1000
or more
Min.
300
or more
Dimension Q
If a snow protection duct is attached after the unit is
installed, verify that dimension Q is 500 mm or more.
If a snow protection duct is attached after the unit is
installed, verify that dimension Q is 500 mm or more.
The amount of space is required for removing the screws on the rear of the unit.
If in case the sufficient space for maintenance is ensured on the rear of the outdoor unit, installation
is possible with the space of both sides of not less than 150mm where marked with * mark.
Min. 250*
or more
or more
Unit: mm
O
P
500
150
NOTE
The top and both sides must remain open. Either the obstacle to the front or the obstacle to the rear
must be no taller than the height of the outdoor unit.
Min. 300 or more
Min. 1500 or more
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Design of Mini VRF SYSTEM
4. Installation Instructions
Use concrete or a similar material to create the base, and ensure
good drainage.
Ordinarily, ensure a base height of 5 cm or more.
If a drain pipe is used, or for use in cold-weather regions, ensure
a height of 15 cm or more at the feet on both sides of the unit.
(In this case, leave clearance below the unit for the drain pipe,
and to prevent freezing of drainage water in cold-weather regions.)
4-8. Installing the Outdoor Unit
4-9. Drainage Work
The tubing and wiring can be extended out in 4 directions
(front, rear, right and down) :
4-10. Routing the Tubing and Wiring
The service valves are housed inside the unit.
To access them, remove the inspection panel.
(To remove the inspection panel, remove the 3 screws,
then slide the panel downward and pull it toward you.)
For the drain port dimensions, refer to Fig. 2-20.
For details, refer to the instruction manual of the drain socket
(field supply).
When using a drain pipe, install the drain socket (field supply) onto
the drain port. Seal the other drain port with the rubber cap supplied
with the drain socket.
Ensure a base height of 15 cm or more at the feet on both sides of
the unit.
Be sure to anchor the feet with anchor bolts (M10). In addition,
use anchoring washers on the top side. (Use large square 32 × 32
SUS washers with JIS nominal diameter of 10.) (Field supply)
Refer to Fig. 2-20 for the anchor bolt dimensions.
Fig. 2-20
380
18
20
20
(10)
410
13
340
1330
290
26
105
219 7575
50
13
13
20
170
660
940
110
13
13
4- ø32
Drain port (2 locations)
Drain port
Anchor bolt
(M10)
(M10)
Air Intake
Air discharge
4- ø13 Anchor bolt hole
Follow the procedure below to ensure adequate draining for the
outdoor unit.
(1)
(2)
If the routing direction is through the front, rear, or right,
use a nipper or similar tool to cut out the knockout holes
for the inter-unit control wiring outlet, power wiring outlet,
and tubing outlet from the appropriate covers A and B.
When routing the wiring, be sure to attach each supplied
plastic bar to the edges around the wiring outlet holes in
order to protect the wiring from scratches by the cutting burr.
If the routing direction is down, use a nipper or similar tool to
cut out the lower flange from cover A.
Fig. 2-21
Route the tubing so that it does not contact the compressor, panel, or other parts inside
the unit. Increased noise will result if the tubing contacts these parts.
When routing the tubing, use a tube bender to bend the tubes.
CAUTION
Inter-unit control wiring outlet *
Inspection panel
Power wiring outlet *
Cover A
Tubing outlet
Cover B
Right
Down
Rear
Front
After completing the installation work of the drain socket, make sure
that the water does not leak from any part of connection.
N OT E
* When not using a conduit material or existing materials,
measure and cut the supplied plastic bar according to
the size of the wiring outlet hole. Then attach the plastic
bar to the edges around the hole. Use sealing putty to
seal off the hole to prevent the dust and insects from
entering the wiring outlet holes.
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Design of Mini VRF SYSTEM
5. HOW TO PROCESS TUBING
N OT E
inside surface is glossy and smooth
edge is smooth
tapered sides are of uniform length
edge is smooth
tapered sides are of uniform length
Adjust the shape of the liquid tube using a tube bender at the installation site and connect it to the liquid tubing side valve
using a flare.
Deburring
Fig. 2-22
Fig. 2-23
After
Before
Copper
tubing
tubing
Reamer
Fig. 2-24
Flare nut
Flare tool
Copper
tubing
tubing
Fig. 2-25
Fig. 2-26
Union
Flare nut
Apply refrigerant
lubricant.
lubricant.
5. HOW TO PROCESS TUBING
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 which run between
indoor and outdoor units. In this method, the copper tubes are
flared at each end and connected with flare nuts.
Both the liquid tubing and gas tubing sides are connected by a flare nut.
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 the end of the copper tube with a tube
reamer or file. This process is important and should be
done carefully to make a good flare. (Fig. 2-22)
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 2-23)
N OT E
A good flare should have the following characteristics:
(3)
(4)
Remove the flare nut from the unit and be sure to mount it
on the copper tube.
Make a flare at the end of the copper tube with a flare tool.
(Fig. 2-24)
Caution Before Connecting Tubes Tightly
(1)
(2)
Apply a sealing cap or water-proof tape to prevent dust or
water from entering the tubes before they are used.
Be sure to apply refrigerant lubricant to the matching
surfaces of the flare and union before connecting them
together. This is effective for reducing gas leaks. (Fig. 2-25)
(3) For proper connection, align the union tube and flare tube
straight with each other, then screw in the flare nut lightly
at first to obtain a smooth match. (Fig. 2-26)
Cautions During Brazing
Replace air inside the tube with nitrogen gas to prevent 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 refrigerant and
refrigerant oil, and may cause damage or malfunctions.
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