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How to open the valve
Fully open the valves of the outdoor unit. (First fully
open the valve on the liquid side, and then fully open
the valve on the gas side.)
* Do not open or close the valves when the ambient
temperature is -20°C or less. Doing so may damage
the valve O-rings and result in refrigerant leakage.
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
Groove position
Groove to insert a
screwdriver
Closed completely
Opened fully
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
14 to 18 N•m
Ø9.5 mm
(1.4 to 1.8 kgf•m)
Valve size
20 to 25 N•m
Ø15.9 mm
(2.0 to 2.5 kgf•m)
14 to 18 N•m
Charge port
(1.4 to 1.8 kgf•m)
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.
Charging additional refrigerant
Figure of Single
Figure of simultaneous twin
Indoor unit
Outdoor unit
Outdoor unit
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* ℓ
to ℓ
are the lengths of the pipes shown in the figures above (unit: m).
1
4
Single
Diameter of connecting pipe
(liquid side)
refrigerant per meter (g/m)
ℓ
Ø9.5
Simultaneous twin
Diameter of connecting pipe
Outdoor
(liquid side)
unit
ℓ
ℓ
1
2
GM160
Ø9.5
Ø9.5
Ø9.5
Simultaneous triple
Diameter of connecting pipe
Outdoor
(liquid side)
unit
ℓ
ℓ
ℓ
1
2
3
GM160
Ø9.5
Ø6.4
Ø6.4
– 10 –
Figure of Simultaneous triple
Indoor unit
Indoor unit
Indoor unit
Distributor
Outdoor unit
2
3
2
1
Amount of additional
Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
α
35
α × (
Amount of
additional
Amount of additional refrigerant (g) =
refrigerant per
Amount of refrigerant charged for main pipe +
meter (g/m)
amount of refrigerant charged for branch piping
α
β
ℓ
3
35
35
α × (
– 28) + β × (
ℓ
1
Amount of
additional
Amount of additional refrigerant (g) =
refrigerant per
Amount of refrigerant charged for main pipe +
meter (g/m)
amount of refrigerant charged for branch piping
α
β
ℓ
4
Ø6.4
35
20
α × (
– 28) + β × (
ℓ
1
Indoor unit
Indoor unit
4
3
Distributor
1
−30)
ℓ
+
– 4)
ℓ
ℓ
2
3
+
+
– 6)
ℓ
2
ℓ
3
ℓ
4
EN
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