Carrier RAV-SP180UT-UL Installation Manual page 18

4-way Air Discharge Cassette Type
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 centers 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.
Half union
Externally
threaded side
Use a wrench to secure.
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.
Evacuation
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.
17-EN
Unit : ft•lbs (N•m)
Tightening torque
10 - 13 (14 - 18)
24 - 31 (33 - 42)
37 - 46 (50 - 62)
46 - 57 (63 - 77)
Flare at
indoor
unit side
Flare at
outdoor
unit side
Flare nut
Internally
threaded side
Use a torque wrench to tighten.
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.
Open the valve fully
Open the valve of the outdoor unit fully. A 4 mm
hexagonal wrench is required for opening the valve.
For details, refer to the Installation Manual attached to
the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap of
the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC
refrigerant (R410A, R134a, etc.).
Thermal insulation process
Apply thermal insulation for the pipes separately at
liquid side and gas side.
For the thermal insulation to the pipes at gas side, be
sure to use the material with heat-resisting
temperature 248 °F (120 °C) or higher.
Using the attached thermal insulation material, apply
the thermal insulation to the pipe connecting section of
the indoor unit securely without gap.
REQUIREMENT
• Apply the thermal insulation to the pipe connecting
section of the indoor unit securely up to the root
– 17 –
Installation Manual