Caution Before Connecting Tubes Tightly; Tubing Connections; Insulation Of Refrigerant Tubing; Taping The Tubes - Panasonic CU-5E34NBE-C Installationsanleitungen

3-5. Caution Before Connecting Tubes Tightly

a) Be sure to apply a sealing cap or water-proof tape to prevent dust or water
from getting into the tubes before they are used.
b) Be sure to apply refrigerant lubricant to the matching
surfaces of the flare and union before connecting them together. This is effec-
tive for reducing gas leaks. (Fig. 12)
c) 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. 13)

3-6. Tubing Connections

a) Temporary connection: Screw in 3 – 5 turns by hand. (Fig.14)
b) To fasten the flare nuts, apply specified torque as:
Table 4
Tube Dia.
6.35 mm (1/4")
9.52 mm (3/8")
12.70 mm (1/2")
15.88 mm (5/8")
CAUTION
Be sure to match refrigerant
tubing and electric wiring
between indoor and outdoor
units.

3-7. Insulation of Refrigerant Tubing

IMPORTANT
To prevent heat loss and wet floors due to dripping of condensation, both
tubes must be well insulated with a proper insulation material.
The thickness of the insulation should be a minimum
8 mm. (Fig. 17)

3-8. Taping the Tubes

CAUTION
(1) At this time, the 2 refrigerant tubes (and electrical wire if local
codes permit) should be taped together with armoring tape.
The drain hose may also be included and taped together as 1
bundle with the tubing.
(2) Wrap the armoring tape from the bottom of the outdoor unit to
the top of the tubing where it enters the wall. As you wrap the
tubing, overlap half of each previous tape turn. (Fig. 18)
(3) Clamp the tubing bundle to wall, using 1 clamp approx. every
120 cm.
NOTE
Do not wind the armoring tape too tightly, since this will decrease the heat insulation
effect. Also, be sure the condensation drain hose splits away from the bundle and drips
clear of the unit and the tubing.

3-9. Finishing the Installation

After finishing insulating and taping over the tubing, use sealing putty to seal off the hole
in the wall to prevent rain and draft from entering. (Fig. 19)
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Tightening Torque
14 – 18 N·m (140 – 180 kgf · cm)
34 – 42 N·m (340 – 420 kgf · cm)
49 – 55 N·m (490 – 550 kgf · cm)
68 – 82 N·m (680 – 820 kgf · cm)
After a tube has been
insulated, never try to
bend it into a narrow
curve, as this may cause
the tube to break or crack.
manuals search engine
E
D
Service valve on
C
narrow tube side
B
Service valve on
wide tube side
A
Fig. 14
Indoor unit
Min.
Insulation
8 mm
Fig. 16
12
Apply refrigerant
lubricant here and here
Fig. 12
Flare nut
Union
Fig. 13
Apply the provided labels
to the indoor and outdoor
unit tubing connectors to
prevent errors in
connections.
Torque wrench
Spanner
Outdoor unit
Fig. 15
Insulation
Thickness:
min. 8 mm
Fig. 17
Clamp
Insulated tubes
Fig. 18
Apply putty here
Tubing
Fig. 19