Toshiba RAS-3M18SAV-E Einbauanleitung Seite 11

01_OutdoorInstallation_EN.fm Page 9 Monday, February 5, 2007 4:11 PM
• Tightening torque for connection of flare pipe
The pressure of R410A is higher than R22. (Approx. 1.6 times.)
Therefore securely tighten the flare pipes which connect the outdoor unit
and the indoor unit with the specified tightening torque using a torque
wrench.
If any flare pipe is incorrectly connected, it may cause not only a gas
leakage but also trouble in the refrigeration cycle.
RAS-3M18SAV-E, RAS-3M18SACV-E, RAS-3M23GACV-E
A
B
C
Total
* Connect two or more indoor units to the 3M18.
* The unit A connection port diameter is φ6.35 / φ9.52 for the 3M18 and
φ6.35 / φ12.7 for the 3M23.
* Use a different-diameter joint if the diameters of the connection port and connection piping are different.
* Only one 16-class indoor unit can be connected to the 3M18.
All combinations that do not exceed the "Total" number can be installed. Note that expanders and reducers may be required
depending on the combination method.
Evacuating
After the piping has been connected to the indoor unit, perform the air purge.
AIR PURGE
Evacuate the air in the connecting pipes and in the indoor unit using a vacuum pump. Do not use the refrigerant in the outdoor unit.
For details, see the vacuum pump manual.
Use a vacuum pump
Be sure to use a vacuum pump with counter-flow prevention function so that
oil inside the pump does not flow back into the air conditioner pipes when the
pump stops. (If oil inside the vacuum pump enters the air conditioner circuit
which uses R410A, trouble with the refrigeration system may develop.)
1. Connect the charge hose from the manifold valve to the service port of
the gas side packed valve.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold valve.
4. Operate the vacuum pump to begin evacuating. Perform evacuating for
about 15 minutes if the piping length is 20 meters (15 minutes for 20 total
meters) (assuming a pump capacity of 27 liters per minute). Confirm that
the compound pressure gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure valve handle of gauge manifold.
6. Open fully the valve stem of the packed valves (both sides of Gas and
Liquid).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
9. Perform steps 1 through 8 above on each connected indoor unit.
1 unit: 16 or 13 or 10
1 unit: 13 or 10
10
36
Outdoor unit
Compound pressure gauge
–101 kPa (–76 cmHg)
Handle Lo
Charge hose
(For R410A only)
Service port
(Valve core (Setting pin))
9
φ6.35
φ9.52 Unit C
φ6.35
Unit B
φ9.52
φ6.35
Unit A
φ9.52 or φ12.7
Indoor unit
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R410A only)
Vacuum pump adapter for
counter-flow prevention
(For R410A only)
Vacuum
pump
Connecting pipe
Packed valve at liquid side
Packed valve at gas side
EN