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6.3. Request for refrigerant piping connection
Description of parts to be used
No.
Work procedures
Mount the provided pipe insu-
lation (1) on the liquid pipe of
the refrigerant piping, and
then mount the flare insula-
1
tion (2) on the gas pipe.
Fixing of insulated pipe
2
Fixing of flare insulation
3
[Fig. 6.3.1] (P.3)
"0-0 gas" mark
"OUTER" mark
Refrigerant piping (gas)
Field refrigerant piping
Insulation material
Pull in this direction.
Flare
Move to the original position.
[Fig. 6.3.2] (P.3)
(figure showing the flare insulation)
Field refrigerant piping
Unit body plate
INNER
Provided flare insulation (2)
7. Connecting refrigerant pipes and drain pipes
7.1. 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 flare connection.
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 50cm [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.
Caution:
• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper alloy seamless
pipes and tubes". In addition, be sure that the inner and outer surfaces
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)
Detail of work
"INNER" and "OUTER" are marked on the
inside of the flare insulation. Mount the por-
tion marked "INNER" near the unit body and
the portion marked "OUTER" on the field pip-
ing side.
• Fasten the insulated pipe with the insula-
tion tape.
• Firmly secure the insulation with the pro-
vided tie band (4) at the position indicated
on the drawing.
• Fasten the flare insulation with the pro-
vided tape (3).
• Fasten with the provided tie band (4) at the
position indicated on the drawing.
"INNER" mark
Flare insulation (2)
Refrigerant piping (liquid)
Pipe insulation (1)
Flare
Insulation material
There must be no gap.
There must be no gap.
OUTER
Unit body
Item to be observed
• Using the flare insulation of a different model may
result in condensation forming. Check the model name
on the insulation and be sure to use the correct one.
• To prevent a gap from forming near the unit's side
plate, be sure that the flare insulation firmly contacts
the unit's side plate before mounting.
• Incorrectly mounting the "INNER" and "OUTER" sides
of the insulation may result in condensation forming.
Seal the slit securely so that there are no openings. Be
sure to mount the insulation so that the slit is on the top.
Seal the slit securely so that there are no openings. Be
sure to mount the insulation so that the slit is on the top.
[Fig. 6.3.3] (P.3)
Tape (3)
Provided tie band (4)
Notes:
*1
Insert the flare nut into the field refrigerant piping. Pull the insulation
material back at the area where it will be flared, then return it to its
original position after performing the flare work.
Exposing copper piping may result in condensation forming. Be
extremely careful when performing this operation.
*2
There must be no gap.
*3, *4 There must be no gap. Slit should be on the top.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator
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.
7.2. 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. 7.2.1] (P.4)
Downward slope 1/100 or more
Indoor unit
Maximize this length to approx. 10 cm [3-15/16 in]
[Fig. 7.2.2] (P.4)
Control box
Plug (Accessory)
Drain hose (Accessory)
When 2 drains are necessary, remove the plug
•
Use the following instructions when using an optional drain-up mechanism.
Caution:
Pipe the drain piping to ensure that it discharges drain, and insulate it to
prevent dew condensation. A failure to the piping work may cause water
leakage and so wet your property.
Reference drawing
Fig. 6.3.1 (P.3)
Fig. 6.3.2 (P.3)
(Note *2)
Fig. 6.3.2 (P.3)
Fig. 6.3.3 (P.3)
(Note *3)
Fig. 6.3.3 (P.3)
(Note *4)
Fasten with tape.
Drain hose (Accessory)
Collective piping
Insulation (Accessory)
Hose band (Accessory)
Drain pipe (Field supply)
and attach
and
.
9
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