Insulating The Refrigerant Tubing - Sanyo SPW-C706VH8 Instrucciones De Instalación

4 Out Bottom
Flare Process
●
The ø25.4 gas main will not pass easily into the opening for
coolant pipes in the pipe cover, so make sure you connect the
ø25.4 pipe with the ø 19.05 pipe outside of the outdoor unit.
(2) Tightly connect the indoor-side refrigerant tubing extended
from the wall with the outdoor-side tubing.
(3) 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 monkey wrenches or spanners. (Fig. 7-6)
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
●
When removing or tightening the gas tube flare nut, use 2
monkey wrenches together: one at the gas tube flare nut,
and the other at part A. (Fig. 7-7)
●
For the flare nuts at tubing connections, be sure to use the
flare nuts that were supplied with the unit, or else flare nuts
for R410A (type 2). The refrigerant tubing that is used must
be of the correct wall thickness as shown in the table below.
Tightening torque
Tube diameter
(approximate)
14 – 18 N · m
ø6.35 (1/4")
(140 – 180 kgf · cm)
34 – 42 N · m
ø9.52 (3/8")
(340 – 420 kgf · cm)
49 – 61 N · m
ø12.7 (1/2")
(490 – 610 kgf · cm)
68 – 82 N · m
ø15.88 (5/8")
(680 – 820 kgf · cm)
100 – 120 N · m
ø19.05 (3/4")
(1000 – 1200 kgf · cm)
Because the pressure is approximately 1.6 times higher than
conventional refrigerant pressure, the use of ordinary flare
nuts (type 1) or thin-walled tubes may result in tube rupture,
injury, or asphyxiation caused by refrigerant leakage.
Spanner
Outdoor unit
A
Tube thickness
0.8 mm
0.8 mm
0.8 mm
1.0 mm
1.2 mm
●
In order to prevent damage to the flare caused by over-
tightening of the flare nuts, use the table above as a guide
when tightening.
●
When tightening the flare nut on the liquid tube, use a
monkey wrench with a nominal handle length of 200 mm.
● Do not use a spanner to tighten the valve stem caps. Doing
so may damage the valves.
● Depending on the installation conditions, applying excessive
torque may cause the nuts to crack.
Precautions for Packed Valve Operation
● If the packed valve is left for a long time with the valve stem
cap removed, refrigerant will leak from the valve. Therefore,
do not leave the valve stem cap removed. (Fig. 7-8)
● Use a torque wrench to securely tighten the valve stem cap.
● Valve stem cap tightening torque:
Charging port
Valve stem cap

7-3. Insulating the Refrigerant Tubing

Tubing Insulation
● Thermal insulation must be applied to all units tubing,
including distribution joint (purchased separately).
* For gas tubing, the insulation material must be heat
resistant to 120°C or above. For other tubing, it must be
Fig. 7-6
heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or greater.
If the conditions inside the ceiling exceed DB 30°C and RH
70%, increase the thickness of the gas tubing insulation
material by 1 step.
Inter-unit control
wiring
Fig. 7-7
CAUTION
If the exterior of the outdoor unit valves has been finished
with a square duct covering, make sure you allow sufficient
space to access the valves and to allow the panels to be
attached and removed.
48
Packed valve
Charging port
Valve stem
Main valve
Valve stem cap
8 – 10 N • m (80 – 100 kgf • cm)
20 – 25 N • m (200 – 250 kgf • cm)
Two tubes arranged together
Gas tube
Insulation
Fig. 7-8
Liquid tube
Armoring tape
Fig. 7-9