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Refrigerant piping
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
Liquid pipe
Gas pipe
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
DB68-11271A-02_IM_CAC Universal AHU Indoor_AA_EN_.indd 14
AC012/018BNZDCH
1/4 (6.35)
1/2 (12.7)
Oblique
90
AC024BNZDCH
AC030/036/042/048BNZDCH
1/4 (6.35)
5/8 (15.88)
Rough
Burr
Unit : inch(mm)
3/8 (9.52)
5/8 (15.88)
2022-09-15 오전 9:53:16
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