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Precautions when operating the 3-way valve for piping
installation
●
If the 3-way valve is left for a long time with the valve cap
removed, refrigerant will leak from the valve. Therefore, do
not leave the valve cap removed.
●
Use a torque wrench to securely tighten the valve cap.
●
Tightening torque:
Tightening torque (approx.)
Service port
10.7 – 14.7 N • m {107 – 147 k
g
f • cm}
ø6.35 (Liquid side)
14.0 – 20.0 N • m {140 – 200 k
g
f • cm}
ø9.52 (Liquid side)
20.6 – 28.4 N • m {206 – 284 k
g
f • cm}
ø12.7, ø15.88 (Gas side) 48.0 – 59.8 N • m {480 – 598 k
g
f • cm}
Insulating the Refrigerant Tubing
Tubing Insulation
Must ensure that pipe-work shall be protected from physical
damage.
●
Thermal insulation must be applied to all units tubing,
including distribution joint (purchased separately).
Two tubes arranged together
Inter-unit control
wiring
Gas tube
Liquid tube
Armoring tape
Insulation
* For gas tubing, the insulation material must be heat
resistant to 120°C or above. For other tubing, it must be
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.
●
When cooling in the low outdoor air, the low-pressure side
pressure may decrease.
Additional Precautions For R32 Models.
Ensure to do the re-flaring of pipes before connecting to
units to avoid leaking.
To prevent the ingress of moisture into the joint which could
have the potential to freeze and then cause leakage, the joint
must be sealed with suitable silicone and insulation material.
The joint should be sealed on both liquid and gas side.
Insulation material and silicone sealant. Please ensure
there are no gaps where moisture can enter the joint.
Silicone Sealant must be neutral cure and ammonia free. Use of
silicon containing ammonia can lead to stress corrosion on the
joint and cause leakage.
V
al
ve c
ap
3-way valve
Service port
Valve shaft
Valve
Valve cap
Connecting Tubing Between Indoor and
Outdoor
Units
(1) Tightly connect the indoor-side refrigerant tubing extended
from the wall with the outdoor-side tubing.
(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 a torque wrench and a spanner.
Outdoor unit
Torque wrench
Spanner
Indoor unit
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.
●
When removing or tightening the gas tube flare nut, use 2
adjustable wrenches together: one at the gas tube flare nut,
and the other at part A.
A
A
●
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, R32 (type 2). The refrigerant tubing that is used
must be of the correct wall thickness as shown in the table
below.
Tube diameter
Tightening torque
(approx.)
Tube thickness
ø6.35 (1/4")
14 – 18 N · m
{140 – 180 k
g
f · cm}
0.8 mm
ø9.52 (3/8")
34 – 42 N · m
{340 – 420 k
g
f · cm}
0.8 mm
ø12.7 (1/2")
49 – 55 N · m
{490 – 550 k
g
f · cm}
0.8 mm
ø15.88 (5/8")
68 – 82 N · m
{680 – 820 k
g
f · cm}
1.0 mm
Because the pressure is approximately 1.6 times higher than
refrigerant R22 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.
●
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
adjustable wrench with a nominal handle length of 200 mm.
●
When tightening the flare nut with the adjustable wrench, do
not apply to the valve cap with the other one.
If doing so, the valve will be damaged.
Flare nut
Valve cap
S
ervice port
●
Depending on the installation conditions, applying excessive
torque may cause the nuts to crack.
01_301769_2WAY_eng.indb 25
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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.
Taping the flare nuts
Wind the white insulation tape around the flare nuts at the gas
tube connections. Then cover up the tubing connections with
the flare insulator, and fill the gap at the union with the supplied
black insulation tape. Finally, fasten the insulator at both ends
with the supplied vinyl clamps.
Insulation tape (white) (supplied)
Sealer (supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Insulation material
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must not
easily absorb moisture.
Refrigerant tubing
and insulator
Drain pipe and insulator
Drain insulator
and clamp
Insulation tape
Packing clamp
Vinyl clamp
Flare insulator
Seal
The procedure used for
installing the insulator for
both gas and liquid
tubes is the same.
Small hose
band
CAUTION
After a tube has been insulated, never try to bend it into
a narrow curve because it can cause the tube to break or
crack.
Never grasp the drain or refrigerant connecting outlets
when moving the unit.
Taping the Tubes
(1) At this time, the refrigerant tubes (and electrical wiring
if local codes permit) should be taped together with
armoring tape in 1 bundle. To prevent condensation from
overflowing the drain pan, keep the drain hose separate
from the refrigerant 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.
(3) Clamp the tubing bundle to the wall, using 1 clamp approx.
each meter.
(4) Interconnecting refrigerant pipework, i.e.
pipework external to the unitary components,
should be marked with a Class label (see right
figure) every two metres where the pipework
is visible. Label size is 50 mm × 50 mm. This
includes pipework located in a ceiling space
or any void which a person may access for
maintenance or repair work within that space.
Inter-unit
control wiring
Insulation
Gas tube
Liquid tube
Armoring tape
N OT E
Do not wind the armoring tape too tightly since this will
decrease the heat insulation effect. Also ensure that the
condensation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
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.
Apply putty here
Tubing
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Содержание Inverter R32 Series
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