Toshiba RAV-GM802ATW-E Installation Manual page 19

Cap tightening torque
Tightening torque
Cap
14 to 18 N•m
Dia. 9.5mm
(1.4 to 1.8 kgf•m)
Valve
size
33 to 42 N•m
Dia. 15.9mm
(3.3 to 4.2 kgf•m)
14 to 18 N•m
Charge port
(1.4 to 1.8 kgf•m)
■ Replenishing refrigerant
Calculate the amount of additional refrigerant using
the formula in the table on the right, and if the value is
positive, add the refrigerant. If the value is negative,
no additional refrigerant is required.
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.
35-EN
To charge 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
Outdoor (liquid side)
unit
ℓ
GM80, 90 φ
9.5
φ
GM110, 140, 160
9.5
Simultaneous twin
Diameter of connecting pipe
Outdoor
(liquid side)
unit
ℓ ℓ ℓ
1 2 3
φ φ φ
GM110
9.5 6.4 6.4
GM140
φ φ φ
9.5 9.5 9.5
GM160
Simultaneous triple
Diameter of connecting pipe
Outdoor
(liquid side)
unit
ℓ ℓ ℓ
1 2 3
φ φ φ φ
GM160 9.5 6.4 6.4
(*1) Even if the calculation result is less than 0, it is not necessary to decrease the amount of refrigerant.
– 18 –
Figure of Simultaneous triple
Indoor unit
Indoor unit
Indoor unit
Outdoor unit
2
3
1
Amount of additional
refrigerant per meter (g/m) Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
α
ℓ
35
α x (
ℓ
35
α x (
Amount of
Amount of additional refrigerant (g) =
additional
Amount of refrigerant charged for main pipe +
refrigerant per
amount of refrigerant charged for branch piping
meter (g/m)
α β
35 20
ℓ ℓ
α x ( - 28) + β x (
1 2
35 35
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
ℓ
α β
4
ℓ ℓ
6.4 35 20
α x ( - 28) + β x (
1 2
Indoor unit
Indoor unit
4
2 3
Distributor
1
(*1)
- 20)
(*1)
- 30)
ℓ
(*1)
+ 4)
3 -
ℓ ℓ
(*1)
+ + 6)
3 4 -
36-EN