42VMC
Refrigerant connections
Make refrigerant connections before connecting the system to the power supply.
Refer to the outdoor unit installation manual for tube sizing, and limitations (slopes, length, number of curves allowed, refrigerant charge, etc.)
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| Tubing diameter |
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| Gas |
| Liquid |
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Model |
| (Suction) |
| (Discharge) | |||
| mm |
| (inches) |
| mm | (inches) | |
009 | 9.52 |
| (3/8”) |
| 6.35 |
| (1/4”) |
012 | 12.70 |
| (1/2”) |
| 6.35 |
| (1/4”) |
014 | 12.70 |
| (1/2”) |
| 6.35 |
| (1/4”) |
018 | 12.70 |
| (1/2”) |
| 6.35 |
| (1/4”) |
024 | 12.70 |
| (1/2”) |
| 6.35 |
| (1/4”) |
•For refrigerant tubes use seamless, insulated refrigeration grade tube, (Cu DHP type according to ISO 1337), degreased and deoxidized, suitable for operating pressures of at least 4200 kPa. Under no circumstances use sanitary type copper pipe.
Note:
•Do not kink or flatten the tubes.
•Avoid bends with a bending radius of less than 100 mm.
•Do not bend copper tubes more than three times at the same point.
•Do not remove flare fittings from unit tubes before actually making the connections.
•Do not fasten the insulation too tightly to the tubes with straps or tape.
Flaring the end of the tubing
Remove protective caps from the copper tube ends. Position tube end downward, cut the tube to the required length and remove the burrs with a reamer.
Remove flare nuts from the unit connections and place them on the tube end.
Flare the tube with a flaring tool.
L | L |
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Flare end must not have any burrs or imperfections. The length of the flared walls must be uniform.
Connection to the unit
Insufficient tightening torque will cause gas leaks. Overtightening the fittings will damage the tube flaring and cause gas leaks.
Adijustable wrench or torque wrench
Connecting pipes
Unit connections | |||
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Tubing diameter | Torque |
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mm | (inches) | Nm |
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6.35 | (1/4”) | 18 |
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9.52 | (3/8”) | 42 |
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12.70 | (1/2”) | 55 |
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Tube insulation
Fastening tape
Once all connections have been completed, check for leaks by applying soapy water to them.
If incorrect connection or removal of the unit results in a refrigerant gas leak, check the refrigerant charge as indicated in the
“OUTDOOR UNIT INSTALLATION MANUAL”.
Finally wrap connections with
Repair and cover any possible cracks in the insulation.
Connection pipes and electric cables between indoor and outdoor units must be fixed to the wall with appropriate conduits.
Check
Pour water into the condensate drain pan and check that it flows freely to the drain.
GB - 8