Connecting The Drain Hose; Outdoor Unit Installation; Connecting The Refrigerant Pipes; Air Removal - IVT 12 THR-N Installation Manual

4

CONNECTING THE DRAIN HOSE

Connecting the drain hose
(1) Connect a drain hose.
(2) Tape over the connecting
part.
ø16mm
Drain hose
(Commercially
available)
Checking drainage
(1) Remove the open panel.
(2) Remove air filter.
(3) Slowly pour some water on evaporator
• If the water flows fast, water may splash into indoor unit,
which will cause water leakage or other trouble.
(4) Check the water drains smoothly.
(5) Replace the air filter.
(6) Replace the open panel.
5

OUTDOOR UNIT INSTALLATION

Referring to the figure, firmly fasten
the outdoor unit with bolts.
6

CONNECTING THE REFRIGERANT PIPES

Flaring the pipe end
(1) Cutting with a pipe cutter
Cut at a right angle.
(2) Deburring
Allow no cuttings in the pipe.
(3) Putting in the flare nut
(4) Flaring
Flare processing dimensions(A)
Tool A
R410A tool 0 - 0.5 mm
Conventional 1.0 - 1.5
tool mm
(5) Checking
To be flared perfectly circular.
.
Flare nut not missing
7

AIR REMOVAL

Use a vacuum pump, gauge manifold and hoses exclusively for R410A.
(1) Remove both valve shaft caps of the 2 and 3-way valves.
(2) Remove the service port cap of the 3-way valve.
(3) Connect the gauge manifold hose to the service port and the vacuum pump.
Be sure that the hose end to be connected to the service port has a valve core pusher.
(4) Open the gauge manifold low-pressure valve(Lo) and operate the vacuum pump for
10-15 minutes.
Make sure the compound gauge reads -0.1 MPa(-76 cmHg).
(5) Close the gauge manifold valve.
(6) Turn off the vacuum pump.
Leave as it for 1-2 minutes and make sure the needle of the compound gauge does not
go back.
(7) Open the 2-way valve 90° counterclockwise by turning the hexagon wrench. Close it
after 5 second, and check for gas leakage.*
(8) Disconnect the gauge manifold hose from the service port.
(9) Fully open the 2-way valve with hexagon wrench.
(10) Fully open the 3-way valve with hexagon wrench.
(11) Firmly tighten the service port cap and both valve shaft caps with a torque wrench at
the specified tightening torque.
* Check the pipe connections for gas leak using a leakage detector or soapy water.
Regarding leakage detector, use high-sensitivity type designed specially for R410A.
* If a high pressure test is mandatory in your country, make sure to follow the local
legislation.
12THR-N_IVT_final all.indd 4
Notes:
• Be sure to lay the drain hose downward for smooth drainflow.
• Be careful not to allow the drain hose to rise, form a trap or leave its end in water, as shown below.
• Coil thermal insulation around a drain hose extension, if running in the room.
500
Connecting the pipes
Connect the pipes for the indoor unit first and then for the outdoor unit.
90°
(1) Tighten the flare nuts by hand for the first 3-4 turns.
(2) Use a wrench and torque wrench to tighten up the pipes.
• Do not over tighten the pipes. It may be deformed or damaged.
A
Flare nut tightening torque
Pipe size
Liquid
side
Gas side
No trap
Not to rise.
allowed.
Air filter
Torque
1/4" (ø 6.35 mm) 16±2 N·m (1.6±0.2 kgf·m)
3/8" (ø 9.52 mm) 38±4 N·m (3.8±0.4 kgf·m)
2-way valve
3-way valve
Service port
Service port cap
Valve shaft cap tightening torque
Pipe size
Liquid side
Gas side
Service port cap tightening torque
Torque
11±1 N · m (1.1±0.1 kgf · m)
4
Not running wavy.
No trap allowed.
Not left in water.
Evaporator
Flare nut
Wrench Torque wrench
Gauge manifold
Compound gauge
Lo Hi
Valve shaft cap
Vacuum pump
Hexagon wrench
(Diagonally 4 mm)
CLOSE
OPEN
Torque
1/4" 24±3 N · m (2.4±0.3 kgf · m)
3/8" 24±3 N · m (2.4±0.3 kgf · m)
2016/1/8 15:57:10