Toshiba RAV-GP801AT-E Mode D'emploi page 84

Charging additional refrigerant
Figure of single
Indoor unit
Outdoor unit
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* to are the lengths of the pipes shown in the figures above (unit: m).
1 3
Single
Diameter of connecting pipe Amount of additional
(liquid side) refrigerant per meter (g/m)
Ø9.5
Simultaneous twin
Diameter of connecting pipe
Outdoor
(liquid side)
unit
1 2 3
GP80, 110 Ø9.5 Ø6.4 Ø6.4
GP140 Ø9.5 Ø9.5 Ø9.5
EN-165
Figure of simultaneous twin
Indoor unit
Outdoor unit
2
Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
35 × ( –30)
Amount of
Amount of additional refrigerant (g) =
additional
Amount of refrigerant charged for main pipe +
refrigerant per
amount of refrigerant charged for branch
meter (g/m)
piping
35 20
× ( – 28) + × (
1
35 35
Gas leak inspection
Use a leak detector manufactured specially for HFC refrigerant
Indoor unit (R32, R410A, R134a, etc.) to perform the R32 gas leak inspection.
* Leak detectors for conventional HCFC refrigerant (R22, etc.)
cannot be used, as the sensitivity drops to approximately 1/40
when used for HFC refrigerant.
• R32 has a high working pressure, so failure to perform the installation
work properly may result in gas leaks such as when the pressure
3
rises during operation. Be sure to perform leak tests on the piping
connections.
1
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.
+ – 4)
2 3
- 83 -
Indoor unit inspection locations
(piping connections)
Refrigerant
piping
Indoor unit side piping
Outdoor unit inspection locations
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.
EN-166