– 15 –
How to open 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
exceedin
J1
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.
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.
Flare nut
Charge port
Valve unit
Using a minus
screwdriver, turn it
counterclockwise by
90° until it hits the
stopper. (Full open)
Groove to insert a
screwdriver
Handle position
Groove position
Closed completely
Opened fully
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.
Cap tightening torque
Valve size
Ø9.5 mm
14 to 18 N
m
(1.4 to 1.8 kgf
m)
Ø15.9 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)
Charging additional refrigerant
2
3
1
Figure of Single
Indoor unit
Indoor unit
Outdoor unit
Outdoor unit
Distributor
Figure of Simultaneous twin
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
*
S
1
to
S
3
are the lengths of the pipes shown in the figures above (unit: m).
Single
Diameter of connecting pipe
(liquid side)
Amount of additional
refrigerant per meter (g/m)
Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
S
α
Ø9.5
35
α
× (
S
–30)
Simultaneous twin
Outdoor
unit
Diameter of connecting pipe
(liquid side)
Amount of
additional
refrigerant per
meter (g/m)
Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe +
amount of refrigerant charged for branch
piping
S
1
S
2
S
3
α
β
GM110
Ø9.5
Ø6.4
Ø6.4
35
20
α
× (
1
– 28) +
β
× (
2
+
3
– 4)
GM140
Ø9.5
Ø9.5
Ø9.5
35
35
29-EN
30-EN
