Service Manual
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EN 15
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
• 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
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
amount, charge the required amount of refrigerant from
the charge port of the valve on the gas side during
cooling.
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the refrigerant
composition varies, which disables normal operation.
Valve size
Ø12.7 mm
50 to 62 N•m
(5.0 to 6.2 kgf•m)
Ø19.1 mm
20 to 25 N•m
(2.0 to 2.5 kgf•m)
Charge port
14 to 18 N•m
(1.4 to 1.8 kgf•m)
Valve unit
Charge port
Using a minus screwdriver,
turn it counterclockwise by
90° until it hits the stopper.
(Full open)
Flare nut
Handle position
Closed completely Opened fully
Main stopper
Movable part of valve (Stem)
Stopper pin
16 EN
Digital Inverter
Adding additional refrigerant
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* 1 to 7 are the lengths of the pipes shown in the figures above (unit: m).
Simultaneous twin
Simultaneous triple
Simultaneous double twin
Diameter of connecting pipe
(liquid side)
Amount of additional
refrigerant per meter
(g/m)
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe +
amount of refrigerant added for branch piping
123DE
Ø12.7 Ø9.5 Ø9.5 80 40 D u (1 – 28) + Eu ( 2 + 3 – 4)
Diameter of connecting pipe (liquid side)
Amount of additional
refrigerant per meter
(g/m)
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe +
amount of refrigerant added for branch
piping
1234DE
Ø12.7 Ø9.5 Ø9.5 Ø9.5 80 40 D u ( 1 – 28) + Eu ( 2 + 3 + 4 – 6)
Outdoor
unit
Diameter of connecting pipe
(liquid side)
Amount of additional
refrigerant per meter (g/m)
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe
+ amount of refrigerant added for first
branch piping + amount of refrigerant
added for second branch piping
1 2, 3 4 to 7 DEJ
SM2244 Ø12.7 Ø9.5 Ø6.4 80 40 20
D u ( 1 – 28) + Eu ( 2 + 3 – 4) +
Ju ( 4 + 5 + 6 + 7)
SM2804 Ø12.7 Ø9.5 Ø9.5 80 40
40
D u ( 1 – 28) + Eu ( 2 + 3 – 4) +
Ju ( 4 + 5 + 6 + 7)
3
2
4
1
2
3
1
Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Outdoor Unit
Indoor Unit
Indoor Unit
Outdoor Unit
Indoor Unit
Figure of Simultaneous triple
45
2
1
3
67
Figure of Simultaneous double twin
Indoor Unit
Indoor Unit
Outdoor Unit
Indoor Unit
Indoor Unit