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Refrigerant piping
The evaporator coil liquid and suction pipes are closed and comes filled with high pressure nitrogen.
Before opening the liquid and suction pipe ends you must first release the high pressure nitrogen using the
NOTE
service port on the suction pipe. Ensure that the service port cap is installed before pressurizing the system.
Air Handlers with DX type evaporator coils require liquid and suction piping sized in accordance with condensing unit
manufacturer's instructions. The evaporator coils have sweat copper connections. Refrigerant lines should be soldered
with silver solder or high temperature brazing alloy.
DRY NITROGEN MUST BE FLOWED THROUGH REFRIGERANT LINES DURING SOLDERING OPERATION.
REFER TO OUTDOOR UNIT INSTALLATION MANUALS FOR PRESSURE CHECKING AND VACUUM DRYING
PROCEDURES.
There are two refrigerant pipes of differing diameters:
• A smaller one for the liquid refrigerant
• A larger one for the gas refrigerant
• The inside of copper pipe must be clean & have no dust.
Prepare the connecting pipe referring to the list below.
• Refrigerant pipe diameters (inches)
12
Liquid pipe
1/4
Gas pipe
1/2
Cutting the pipes
1. Make sure that you prepared the required tools. (pipe cutter, reamer, aring tool and pipe holder)
2. If you want to shorten the pipe, cut it using a pipe cutter ensuring that the cut edge remains at 90° with the side of the pipe.
There are some examples of correctly and incorrectly cut edges below.
14 English
AM072TNZDCH_IM_DVM V-AHU_AA_EN_.indd 14
18
24
30
1/4
3/8
3/8
1/2
5/8
5/8
90
Oblique
36
48
54
3/8
3/8
3/8
5/8
5/8
3/4
Rough
Burr
60
72
3/8
3/8
3/4
3/4
2020-02-14 오전 10:33:31
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