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7.1. Refrigerant pipe and drain pipe specifi-
cations
Item
Refrigerant pipe
Liquid pipe
(Brazing connection)
Gas pipe
Drain pipe
8. Connecting refrigerant pipes and drain pipes
8.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for
both outdoor unit and BC controller (simultaneous cooling and heating series
R2).
•
Series R2 is designed to operate in a system that the refrigerant pipe from an
outdoor unit is received by BC controller and branches at the BC controller to
connect between indoor units.
•
For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
•
The method of pipe connection is brazing connection.
Caution:
•
Install the refrigerant piping for the indoor unit in accordance with the
following.
1. Cut the tip of the indoor unit piping, remove the gas, and then remove the
brazed cap.
[Fig. 8.1.1] (P.3)
Cut here
Remove brazed cap
2. Pull out the thermal insulation on the site refrigerant piping, braze the unit
piping, and replace the insulation in its original position.
Wrap the piping with insulating tape.
Note:
•
Pay strict attention when wrapping the copper piping since wrapping
the piping may cause condensation instead of preventing it.
•
Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent
heat shrinkage and burning the thermal insulation tubing. Take care to
ensure that the flame does not come into contact with the main body itself.
[Fig. 8.1.2] (P.3)
Thermal insulation
Wrap with damp cloth
Ensure that there is no gap here
Cautions On Refrigerant Piping
Be sure to use non-oxidative brazing for brazing to ensure that no for-
eign matter or moisture enter into the pipe.
Be sure to apply refrigerating machine oil over the flare connection
seating surface and tighten the connection using a double spanner.
Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be pro-
vided 50 cm [19-11/16 in] away from the indoor unit's flare connection.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant specified on the unit.
-
Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
9. Duct work
•
When connecting ducts, insert a canvas duct between the main body and the
duct.
•
Use non-combustible duct components.
•
Install sufficient thermal insulation to prevent condensation forming on outlet
duct flanges and outlet ducts.
Caution:
•
The noise from the intake will increase dramatically if intake
directly beneath the main body. Intake
as far away from the main body as possible.
Particular care is required when using it with bottom inlet specifica-
tions.
•
To connect the air conditioner main body and the duct for potential
equalization.
(mm) [in]
Model
06·08·12
φ 6.35 [1/4]
φ 12.7 [1/2]
R1 (External thread)
Pull out insulation
Return to original position
Wrap with insulating tape
is fitted
should therefore be installed
7.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 7.2.1] (P.3)
Refrigerant pipe (liquid pipe)
Refrigerant pipe (gas pipe)
Drain pipe
Caution:
•
Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper alloy seam-
less pipes and tubes". In addition, be sure that the inner and outer sur-
faces of the pipes are clean and free of hazardous sulphur, oxides, dust/
dirt, shaving particles, oils, moisture, or any other contaminant.
•
Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
•
Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate
and the compressor may fail.
•
Use Suniso 4GS or 3GS (small amount) refrigerator oil to coat the flare
and flange connection part. (For models using R22)
•
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigera-
tor oil to coat flares and flange connections. (For models using R410A)
- The refrigerant used in the unit is highly hygroscopic and mixes with water
and will degrade the refrigerator oil.
8.2. Drain piping work
1. Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way.
(A)
2. Ensure that any cross-wise drain piping is less than 20 m [65 ft] (excluding
the difference of elevation). If the drain piping is long, provide metal braces to
prevent it from waving. Never provide any air vent pipe. Otherwise drain may
be ejected.
3. Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm
[1-9/32 in]) for drain piping.
4. Ensure that collected pipes are 10 cm [3-15/16 in] lower than the unit body's
drain port as shown in B.
5. Do not provide any odor trap at the drain discharge port.
6. Put the end of the drain piping in a position where no odor is generated.
7. Do not put the end of the drain piping in any drain where ionic gases are gen-
erated.
[Fig. 8.2.1] (P.3)
Downward slope 1/100 or more
Connection dia. R1 external thread
Indoor unit
Collective piping
Maximize this length to approx. 10 cm [3-15/16 in]
8. Attach the drain piping to the drain hole on both sides when connecting drain
piping from the opposite side (refrigerant pipe).
9. When 2 drains are necessary,attach the drain hose to the drain piping oppo-
site the drain pan as well.
10. When the drain piping connection is one place,
please do not use the drain piping closed with the rubber cork.
•
Keep the distance between the inlet grille and the fan over 850 mm
[33-15/32 in].
If it is less than 850 mm [33-15/32 in], install a safety guard not to touch
the fan.
[Fig. 9.0.1] (P.3)
Air inlet
Access door
Canvas duct
Connect common reference potential wire between duct-work to air condi-
tioner.
Air filter
Air outlet
Ceiling surface
Inlet grille
9
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