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4. Installing
the refrigerant
piping
©
©
Fig. 4-1
@ Liquid pipe
Gas pipe
@ Inslation
@ Taping
(inch)
@ Flare cutting dimensions
(_ Flare nut tightening
torque
©
®
®
Fig. 4-2
@ (Fig. 4-1)
Flare dimensions
Copper pipe O.D.
_A dimensions
(mm)
(inch)
(mm)
(inch)
_6.35
1/4"
8.7 - 9.1
11/32 - 23/64
_9.52
3/8"
12.8 - 13.2
1/2 - 33/64
_12.7
1/2"
16.2-
16.6
41/64-
21/32
_15.88
5/8"
19.3-
19.7
49/64 - 25/32
® (Fig. 4-1)
Copper pipe O.D.
(mm)
(inch)
_6.35
1/4"
_9.52
3/8"
_12.7
1/2"
_15.88
5/8"
Flare nut O.D.
Tightening torque
(mm)
(inch)
(N.m)
(ft.lbs)
17
43/64
14 - 18
10 - 13
22
7/8
34 - 42
25 - 30
26
1 - 3/64
49 - 61
35 - 44
29
1 - 9/64
68 - 82
49 - 59
©
@ Front piping cover
®
Piping cover
®
Stop valve
_)
®
Service
panel
®
Bend radius : 100 mm, 3-15/16 inch-150 mm, 5-27/32 inch
Fig. 4-3
\
®
4.1. Precautions for devices that use R410A refrigerant
• Refer to page 3 for precautions
not included
below on using air condition-
ers with R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene
oil (small amount)
as the refrigeration
oil applied to the flared sections.
• Use C1220
copper
phosphorus,
for copper
and copper
alloy
seamless
pipes, to connect the refrigerant
pipes. Use refrigerant
pipes with the thick-
nesses
specified
in the table to the below.
Make sure the insides
of the
pipes are clean and do not contain any harmful contaminants
such as sul-
furic compounds,
oxidants,
debris, or dust.
Z_ Warning:
When installing
or moving the air conditioner,
use only the specified
refriger-
ant (R410A) to charge the refrigerant
lines. Do not mix it with any other refrig-
erant and do not allow air to remain in the lines. Air enclosed
in the lines can
cause pressure peaks resulting in a rupture and other hazards.
_9.52 mm, 3/8inch
Liquid pipe
thickness 0.8 mm, 1/32 inch
_15.88 mm, 5/8 inch
Gas pipe
thickness
1.0 mm, 3/64 inch
•
Do not use pipes thinner
than those
specified
above,
4.2. Connecting
pipes (Fig. 4-1) (Fig. 4-2)
When commercially
available
copper pipes are used, insulate both the liquid and i
gas pipes separately
with commercially
available
insulation materials (heat-resis-
l
tant to 100 °C, 212 °F or more, th ckness of 12 mm, 1/2 nch or more). (F g. 4-1)
• The indoor parts of the drain pipe should
be wrapped
with polyethylene
foam
insulation
materials
(specific
gravity
of 0.03, thickness
of 9 mm. 23/64 inch or
more).
[Fig. 4-2]
• Apply thin layer of refrigerant
oil to pipe and joint seating surface before tighten-
ing flare nut. @
• Use two wrenches to tighten piping connections.
®
• Use leak detector
or soapy water to check for gas leaks after connections
are
completed.
• Apply refrigerating
machine
oil over the entire flare seat surface. ©
• Use the flare nuts for the following pipe size. ®
t oasside
tPi0esize,mm'noh t
o1 88 t
Liquid side
Pipe size (mm, inch)
_9.52, 3/8"
"1: The flare nut is attached to its pipe.
*2: The flare nut is in the outdoor unit accessory.
Do not use the flare nut attached.
If it is used, a gas leakage or even a pipe ex-
traction may occur.
• When
bending the pipes, be careful not to break them. Bend radii of 100 mm,
3-15/16 inch to 150 mm. 5-27/32 inch are sufficient.
• Make sure the pipes do not contact the compressor.
Abnormal
noise or vibration
may result.
(_ Pipes must be connected
starting from the indoor unit.
Flare nuts must be tightened
with a torque wrench.
Q Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration
oil
(Applied on site).
4.3. Refrigerant piping (Fig. 4-3)
Remove
the service
panel ® (three screws)
and the front piping cover @ (two
screws) and rear piping cover ® (two screws).
(_ Perform refrigerant
piping connections
for the indoor/outdoor
unit when the out-
door unit's stop valve is completely
closed.
Q Vacuum-purge
air from the indoor unit and the connection
piping.
® After connecting
the refrigerant
pipes, check the connected
pipes and the indoor
unit for gas leaks. (Refer to 4.4 Refrigerant
pipe airtight testing method)
Vacuumize
the refrigerant
lines through the service port of the liquid stop valve
and then open the stop valves completely
(for both the liquid and gas stop
valves).
This will completely
connect the refrigerant
lines of the indoor and out-
door units.
• If the stop valves are left closed and the unit is operated,
the compressor
and
control valves will be damaged.
• Use a leak detector
or soapy water to check for gas leaks at the pipe connec-
tion sections of the outdoor unit.
• Do not use the refrigerant
from the unit to purge air from the refrigerant
lines.
• After the valve work is completed,
tighten the valve caps to the correct torque:
20 to 25 N.m, 14 to 18 ft.lbs (200 to 250 kgf.cm).
Failure to replace
and tighten the caps may result in refrigerant
leakage.
In
addition, do not damage
the insides of the valve caps as they act as a seal to
prevent refrigerant
leakage.
® Use sealant to seal the ends of the thermal insulation
around the pipe connec-
tion sections to prevent water from entering the thermal insulation.
5
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