Daikin Air Conditioner 설치 매뉴얼 - 페이지 3
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5.
Purging Air and Checking for Gas Leakage
• When the piping work is completed, it is necessary to purge the air and check for gas leakage.
Warning
1) Do not place any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
2) When a refrigerant gas leak occurs, ventilate the room as soon and as much as possible.
3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may
damage the vacuum pump or the unit.
• If adding additional refrigerant, perform air purging from the
refrigerant pipes and indoor unit using a vacuum pump before
charging additional refrigerant.
• Use a hexagonal wrench (3/16") to operate the shut-off valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench to
the specified tightening torque.
1) Connect projection side (on which worm pin is pressed) of charging hose (which comes from gauge manifold) to gas
shut-off valve's service port.
2) Fully open gauge manifold's low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve subsequently requires no operation.)
3) Do vacuum pumping and make sure that the vacuum pressure gauge reads – 29.9 inHg *1.
4) Close gauge manifold's low-pressure valve (Lo) and stop vacuum pump.
(Keep this state for a few minutes to make sure that the vacuum pressure gauge pointer does not swing back.)*2.
5) Remove valve lids from liquid shut-off value and gas shut-off valve.
6) Turn the liquid shut-off valve's rod 90 degrees counterclockwise with a hexagonal wrench to open valve.
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from indoor unit's flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
7) Disconnect charging hose from gas shut-off valve's service port, then fully open liquid and gas shut-off valves.
(Do not attempt to turn valve rod beyond its stop.)
8) Tighten valve lids and service port cap for the liquid and gas shut-off valves with a torque wrench at the specified torques.
*1. Pipe length vs. vacuum pump run time
Pipe length
Up to 50 feet
Run time
Not less than 10 min.
*2. If the vacuum pressure gauge pointer swings back, refrigerant may have water content or a loose pipe joint
may exists. Check all pipe joints and retighten nuts as needed, then repeat steps 2) through 4).
Outdoor Unit Installation
Compound
Pressure meter
pressure gauge
Gauge
manifold
High-pressure
valve
Valve lids
Low-pressure
valve
Charging
hoses
Service port
Vacuum pump
More than 50 feet
Not less than 15 min.
6.
Refilling The Refrigerant
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the liquid pipe in liquid form.
It is a mixture of refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation.
1)
Before filling, check whether the cylinder has a siphon attached or not. (It should have something like "liquid filling siphon attached" displayed on it.)
Filling a cylinder with an attached siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the cylinder
need not be upside-down to fill with liquid.
• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
7.
Refrigerant Piping Work
7-1 Cautions on Pipe Handling
Liquid
1)
Protect the open end of the pipe against dust and moisture.
shut-off
2) All pipe bends should be as gentle as possible. Use a pipe bender for bending.
valve
7-2
Selection of Copper and Heat Insulation materials
Gas
shut-off
When using commercial copper pipes and fittings, observe the following:
valve
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052 W/mK (0.024-0.030 Btu/fth˚F)
Refrigerant gas pipe's surface temperature reaches 230˚F max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Gas side
15/18 class
24 class
O.D. 1/2 inch
O.D. 5/8 inch
Minimum bend radius
1-9/16 inch or more
1-15/16 inch or more
Thickness 0.031 inch
Thickness 0.039 inch
(C1220T-O)
(C1220T-O)
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
In order to protect the environment, be sure to pump down when relocating or disposing of the unit.
1)
Remove the valve lids from liquid shut-off valve and gas shut-off valve.
2) Carry out forced cooling operation.
3) After five to ten minutes, close the liquid shut-off valve with a
hexagonal wrench.
4) After two to three minutes, close the gas shut-off valve and
stop forced cooling operation.
Forced cooling operation
1)
Press the Forced Operation switch (SW1) to begin forced cooling. Press the Forced Operation switch (SW1) again
to stop forced cooling.
Filling other cylinders
Turn the cylinder upside-down
when filling.
Rain
Liquid pipe
Liquid side
Gas pipe thermal insulation
thermal insulation
15/18/24 class
15/18 class
24 class
15/18/24 class
O.D. 1/4 inch
I.D. 0.551-0.630 inch
I.D. 0.630-0.709 inch
I.D. 0.315-0.393 inch
Thickness 0.393 inch Min.
1-3/16 inch or more
Thickness 0.031 inch
(C1220T-O)
Pump Down Operation
Liquid shut-off valve
Gas shut-off valve
Service port
Forced operation switch
S52
SW1
LED-A
ON
SW4
1A
1
2
3
A B C
Wall
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wiring
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
insulation
insulation
Finishing tape
Drain hose
Hexagonal wrench
Close
Valve lid