ENGLISH
10. Refrigerant piping installation
Connecting the piping is a
The method of connection consists of flare connections at the indoor units, flange connections for the piping of the outdoor unit and flare connections for the liquid, oil balance piping. Note that the branched sections are brazed.
Warning:
Always use extreme care to prevent the refrigerant gas (R22) from leaking while using fire or flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it breaks down and generates a poisonous gas which can cause gas poisoning. Never weld in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrigerant piping has been completed.
10.1. Areas of caution
1Use the following materials for refrigeration piping.
•Material: Seamless phosphorous deoxidized copper pipe,
•Size: Refer to pages 13 to 14.
2Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.
3Use care to prevent dust, water or other contaminants from entering the piping during installation.
4Reduce the number of bending portions as much as possible, and make bending radius as big as possible.
5Always use the branch piping set shown below, which are sold separately. This unit requires a
Branch pipe set name
| Line branching |
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| Header branching |
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Total of units down- | Total of units down- | Total of units downstream | Total of units down- | 4 branching |
| 7 branching |
| 10 branching |
stream less than 160 | stream 161 to 330 | more than 331 to 630 | stream more than 631 |
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6If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut the connecting section and then use an adapter for connecting different diameters to connect the piping.
7Always observe the restrictions on the refrigerant piping (such as rated length, the difference between high/low pressures, and piping diameter). Failure to do so can result in equipment failure or a decline in heating/cooling performance.
8A second branch cannot be made after a header branch. (These are shown by ⋅ .)
A |
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| A |
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B
ATo outdoor unit
BCapped piping
9Always use
0The City Multi Series Super Y will stop due an abnormality due to excessive or insufficient coolant. At such a time, always properly charge the unit. When servicing, always check the notes concerning pipe length and amount of additional refrigerant at both locations, the refrigerant volume calculation table on the back of the service panel and the additional refrigerant section on the labels for the combined number of indoor units. (Refer to pages 13 to 14.)
ANever perform a pump down. This will damage the compressor.
BNever use refrigerant to perform an air purge. Always evacuate using a vacuum pump.
CAlways insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling performance, water drops from condensation and other such problems. (Refer to pages 22 to 23.)
DWhen connecting the refrigerant piping, make sure the ball valve of the outdoor unit is completely closed (the factory setting) and do not operate it until the refrigerant piping for the outdoor and indoor units has been connected, a refrigerant leakage test has been performed and the evacuation process has been completed.
EAlways use a
Warning:
When installing and moving the air conditioner to another site, do not charge the it with a refrigerant different from the refrigerant (R22) specified on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.
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