Air Purge - Toshiba Carrier RAV-SP180KRT-UL Installation Manual

+001111052201_00Ta.book Page 15 Friday, November 20, 2009 11:45 AM
High-Wall Type
Tightening connection
• Do not apply excessive torque. Otherwise, the
nut may crack depending on the conditions.
Outer dia. of copper pipe
1/4" (6.4 mm)
3/8" (9.5 mm)
1/2" (12.7 mm)
5/8" (15.9 mm)
▼ Tightening torque of flare pipe connections
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor and outdoor units of the
specified tightening torque.
Incorrect connections may cause not only a gas
leak, but also a trouble of the refrigeration cycle.
Align the centres of the connecting pipes and
tighten the flare nut as far as possible with your
fingers. Then tighten the nut with a spanner and
torque wrench as shown in the figure.
Work using double spanner
REQUIREMENT
Tightening with an excessive torque may crack the
nut depending on installation conditions.
Tighten the nut within the specified tightening
torque.
Piping with outdoor unit
• Shape of valve differs according to the outdoor
unit.
For details of installation, refer to the Installation
Manual of the outdoor unit.
15-EN
CAUTION
Unit: ft•lbs (N•m)
Tightening torque
10 - 13 (14 - 18)
24 - 31 (33 - 42)
37 - 46 (50 - 62)
50 - 60 (68 - 82)
Heat insulation
Heat insulation for the pipes should be done
separately for the liquid side and gas side. Because
both of the liquid and gas side pipes become a low
temperature during cooling operation, sufficient
heat insulation should be done to prevent
condensation.
• Heat insulator with a heat resistance of 248 °F
(120 °C) or more must be used for the gas side
pipe.
• The pipe connection section of the indoor unit
must be heat insulated securely and compactly
with the attached heat insulator.
Fix with vinyl tape
Heat insulator
(attached)

Air purge

Using a vacuum pump, perform vacuuming from
the charge port of valve of the outdoor unit.
For details, follow to the Installation Manual
attached to the outdoor unit.
• Never use the refrigerant sealed in the outdoor
unit for air purge.
REQUIREMENT
For the tools such as charge hose, etc., use those
manufactured exclusively for R410A.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant
"R410A" referring to the attached Installation
Manual of outdoor unit.
Be sure to use a scale to charge the refrigerant of
specified amount.
REQUIREMENT
• Charging an excessive or too little amount of
refrigerant causes a trouble of the compressor.
Be sure to charge the refrigerant of specified
amount.
• A personnel who charged the refrigerant should
write down the pipe length and the added
refrigerant amount in the nameplate attached to
the service panel of the outdoor unit. It is
necessary to troubleshoot the compressor and
refrigeration cycle malfunction.
– 15 –
Installation Manual
Local side pipe
Toshiba