Installation manual

High Wall Type
Installation Manual
–14–
EN
Tightening connection
CAUTION
• Do not apply excessive torque. Otherwise, the
nut may crack depending on the conditions.
▼ 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.
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.
 Leak check test, evacuation and
other procedure
For leak check test, evacuation, addition of
refrigerant, and gas leak check, refer to the
Installation Manual attached to the outdoor unit.
REQUIREMENT
Do not supply power to the indoor unit until the leak
check test and evacuation are completed. (If the
indoor unit is powered on, the pulse motor valve is
fully closed, which extends the time for vacuuming.)
Open the valve fully
Open the valve of the outdoor unit fully.
For details, refer to the Installation Manual attached
to the outdoor unit.
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.
Unit: ft•lbs (N•m)
Outer dia. of copper pipe Tightening torque
1/4” (6.4 mm) 10 - 13 (14 - 18)
3/8” (9.5 mm) 24 - 31 (33 - 42)
1/2” (12.7 mm) 37 - 46 (50 - 62)
5/8” (15.9 mm) 50 - 60 (68 - 82)
Work using double spanner
Fix with vinyl tape
Heat insulator
(attached)
Local side pipe
14-EN