31
Vacuum drying
After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out by using the service ports of both the liquid and gas side valves.
CAUTION
Use two wrenches and tighten with regular torque.
Do not overtighten, overtightening may cause gas leakage.
Piping size
Torque
1/4" (6.35 mm)
13.3 Ibf•ft [18 N•m (1.8 kgf•m)]
3/8" (9.52 mm)
31.0 Ibf•ft [42 N•m (4.3 kgf•m)]
1/2" (12.7 mm)
40.6 Ibf•ft [55 N•m (5.6 kgf•m)]
5/8" (15.88 mm)
47.9 Ibf•ft [65 N•m (6.6 kgf•m)]
3/4" (19.05 mm)
73.8 Ibf•ft [100 N•m (10.2 kgf•m)]
11.1.4 Indoor Unit Drain Piping
During drain piping connection, be careful not to exert extra force on the drain port at the indoor unit.
The outside diameter of the drain connection at the indoor unit is 1-1/4" (32 mm).
Piping material: Polyvinyl chloride pipe VP-25 and pipe fittings.
Be sure to perform heat insulation on the drain piping.
Heat insulation material: Polyethylene foam with thickness more than 5/16" (8 mm) (local supply).
Drain piping must have down-slope (1/50 to 1/100); be sure not to provide up-and-down slope to prevent reversal
flow.
Be sure to check no air trap on drain hose and to ensure smooth water flow and no abnormal sound.
The height of drain may be possible up to 29-1/2"
(750 mm).
When drain set piping, install as shown in the
figure below.
Drain Test
The air conditioner uses a drain up motor to drain water. Use the following procedure to test the drain
up motor operation.
Connect the main drain pipe to exterior and leave it provisionally until the test comes to an end.
Feed water to the flexible drain hose and check the piping for leakage.
Be sure to check the drain up motor for normal operating and noise when electric wiring is complete.
When the test is complete, connect the flexible drain hose to the drain port.
Pour about 600-700cc of water in the drain pan of the indoor unit. (Pour from the position specified in the drawing
by using a water supply bottle or other suitable tool.)
Press the drain pump test run on PCB to start the drain motor, and verify water drainage.
(The drain motor will automatically stop after operating for about five minutes.)
Upward routing
Pipe clamp
Indoor
unit
Trap
Down-slope
Down-slope
Upward-slope
Air Trap
No Air Trap
Down-slope (1/50 ~ 1/100)
Drain port
29
1
/
2
"
(750
m
m
)
or
le
s
s
Elbow
Elbow
Indoor unit
Apply the head when connecting with the
confluence pipe. (about 3
15
/
16
"
(100 mm))
Indoor
unit
Down-slope (1/50 ~ 1/100)
Use VP30 or more confluence
Feed water
Drain hose
Drain up motor
Glue the joint
Drain hose connection
Use the clip (accessory)
Main drain pipe
Drain
port
Drain pan
Air outlet vent
