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Digital Inverter
How to Open the Valve
Open or close the valve.
Liquid side
Open the valve with a 4 mm hexagon wrench.
Gas side
Valve unit
Using a minus screwdriver, turn it counterclockwise by 90° until it hits the stopper. (Full open)
Charge port
Flare nut
Handle position
Closed completely | Opened fully |
Stopper pin
Insulating the Pipes
•The temperatures at both the liquid side and gas side will be low during cooling so in order to prevent condensation, be sure to insulate the pipes at both of these sides.
•Insulate the pipes separately for the liquid side and gas side.
•Insulate the branch pipes by following the instructions in the installation manual provided with the branch pipe kit.
•Use the insulating material provided as an accessory to insulate the Ø19.1 mm pipe at the gas side.
•Seal the area where the Ø19.1 mm pipe and Ø22.2 to Ø28.6 mm pipe are connected so that no gaps are left.
REQUIREMENT
Be sure to use an insulating material which can withstand temperatures above 120°C for the gas side pipe since this pipe will become very hot during heating operations.
Replenishing Refrigerant
This model is a 30 m chargeless type that does not need to have its refrigerant replenished for refrigerant pipes up to
30 m. When a refrigerant pipe longer than 30 m is used, add the specified amount of refrigerant.
Refrigerant replenishing procedure
1. | After vacuuming the refrigerant pipe, close the valves |
| and then charge the refrigerant while the air conditioner |
| is not working. |
2. | When the refrigerant cannot be charged to the specified |
Digital Inverter
Adding additional refrigerant
Figure of Simultaneous twin | Figure of Simultaneous triple | ||
| Indoor Unit |
| Indoor Unit |
| Indoor Unit | Indoor Unit | |
Indoor Unit |
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Outdoor Unit |
| Outdoor Unit | 4 |
2 | 3 | 2 | 3 |
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Figure of Simultaneous double twin
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| Indoor Unit | Indoor Unit | Indoor Unit | |
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Outdoor Unit | 4 |
| 5 | 6 | 7 |
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Formula for calculating the amount of additional refrigerant |
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(Formula will differ depending on the diameter of the liquid connecting side pipe.) |
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* 1 to 7 are the lengths of the pipes shown in the figures above (unit: m). |
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Simultaneous twin |
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Diameter of connecting pipe | Amount of additional |
| Amount of additional refrigerant (g) = | ||
refrigerant per meter |
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Main stopper
Movable part of valve (Stem)
amount, charge the required amount of refrigerant from |
the charge port of the valve on the gas side during |
| (liquid side) |
| (g/m) | Amount of refrigerant added for main pipe + |
1 | 2 | 3 |
| amount of refrigerant added for branch piping |
Δ | Ε |
•While the valve is fully opened, after the screwdriver has reached the stopper, do not apply torque exceeding
5 N•m. Applying excessive torque may damage the valve.
Valve handling precautions
•Open the valve stem until it strikes the stopper. It is unnecessary to apply further force.
•Securely tighten the cap with a torque wrench.
Cap tightening torque
| Ø12.7 mm | 50 to 62 N•m | |
| (5.0 to 6.2 kgf•m) | ||
Valve size |
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Ø19.1 mm | 20 to 25 N•m | ||
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| (2.0 to 2.5 kgf•m) | ||
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Charge port |
| 14 to 18 N•m | |
| (1.4 to 1.8 kgf•m) | ||
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cooling. |
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the refrigerant composition varies, which disables normal operation.
Ø12.7 | Ø9.5 | Ø9.5 | 80 |
| 40 |
| Δ υ ( 1 – 28) + Ευ ( | 2 + 3 – 4) |
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Simultaneous triple |
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| Amount of additional | Amount of additional refrigerant (g) = | ||||||
Diameter of connecting pipe (liquid side) |
| refrigerant per meter | Amount of refrigerant added for main pipe + | |||||||||
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| amount of refrigerant added for branch | |||||
1 | 2 | 3 | 4 |
| Δ | Ε |
| piping |
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Ø12.7 | Ø9.5 | Ø9.5 | Ø9.5 |
| 80 | 40 | Δ υ ( 1 – 28) + Ευ ( 2 + 3 + 4 – 6) | |||||
Simultaneous double twin |
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| Diameter of connecting pipe | Amount of additional | Amount of additional refrigerant (g) = | |||||||||
Outdoor |
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| refrigerant per meter (g/m) | Amount of refrigerant added for main pipe | |||||||
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unit |
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1 | 2, 3 | 4 to 7 | Δ | Ε | ϑ | branch piping + amount of refrigerant | ||||||
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| added for second branch piping | |||||
SM2244 | Ø12.7 | Ø9.5 | Ø6.4 | 80 | 40 | 20 | Δ υ ( | 1 – 28) + Ευ ( | 2 + | 3 – 4) + | ||
| ϑυ ( 4 + | 5 + | 6 + | 7) | ||||||||
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SM2804 | Ø12.7 | Ø9.5 | Ø9.5 | 80 | 40 | 40 | Δ υ ( | 1 – 28) + Ευ ( | 2 + | 3 – 4) + | ||
| ϑυ ( 4 + | 5 + | 6 + | 7) | ||||||||
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| 16 | EN | |
EN | 15 | |||
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