5
3.5 Refrigerant Piping
* Refrigerant piping must be done by professional
technician and follow the national codes.
* If the suction line has to raise up over the unit cooler,
raising tube must with an oil trap to make sure good
oil return
* Horizontal suction line should pitch down from unit
cooler to compressor. Suction line should be
insulated to prevent condensate water.
* Refrigerant line should be as short as possible to
reduce pressure drop.
a. In order to prevent moisture entering unit cooler, the
unit cooler is sealed with pressurized dry gas. Before
brazing connection tube, use copper tube cutter to cut a
slit for exhausting sealed gas.
Be careful for the
ejected gas or tube scraps. Wear personal safety
protecting equipment while working.
b. When the unit cooler reaches to the zero pressure status,
deburr the tube ends and expand tube end for brazing.
For the good cleanness inside the system, use dry
nitrogen to purge the oxygen out. This will prevent
forming oxide inside during brazing.
c. When finish connecting all the components, perform
leak test and vacuuming. Make sure there is no leak
and reach the required vacuum level. It’s very
important for steady system operating.
d. When installation job is done, the expansion valve
should be set to correct super heat in test running. For
the best performance of unit cooler and preventing the
liquid compressed in compressor
,
the super heat
adjustment must be executed at the lowest evaporating
temperature of system design value. For temperature
difference between evaporating and room temperature
at 6~7
o
C, adjust the super heat around 2.8~3.5
o
C. For
temperature difference between evaporating and room
temperature at 8
o
C, adjust the super heat around 5
o
C.
3.5 冷媒配管
※
配管必須符合國家相關法規與系統實際操作需求。
並由專業技術人員執行。
※
如果吸氣管必須要拉高超過蒸發器組的連接位置
時，升管的底部必須要接一個集油彎，解決回油
問題。
※
水平的吸氣回管應由蒸發器斜向壓縮機。吸氣管應
做適當的保溫，避免產生冷凝水。
※
冷媒管路盡可能保持短，以降低管路壓損。
a.
為確保蒸發器管路內部保持乾燥，出廠前內部會
充填乾燥氣體。焊接前，請用切管刀小心將銅管
切開一個小縫，讓蒸發器內部氣體排出。
注意
!
切管時應注意噴出氣體或銅管碎屑，工作時請穿
戴個人安全防護裝備。
b.
當蒸發器達到零壓力後，開始進行銅管切口去毛
邊與擴口準備焊接。為維持管內的潔淨，焊接前
請先以氮氣掃除原管內的氧氣，焊接時請以微量
氮氣充入管內進行焊接，以避免管內氧化！
c.
當連接完成所有的管路後，進行測漏與抽真空。
確認系統無洩漏且達到所需要的真空度。此對於
日後系統穩定運轉是十分重要。
d.
在安裝完成後，膨脹閥必需要調整達到系統所要的
過熱度。為獲得完整的蒸發器能力，在系統操作
的最低蒸發溫度下將膨脹閥調整適當的過熱度。
建議在
6
～
7
℃
T.D.
的系統調整到
2.8
～
3.3
℃的過
熱，在
8
℃
T.D.
的系統
調整到
5
℃的過熱。
To Compressor
至壓縮機
External equalizer line
外部均壓管
Thermal Bulb
感溫胞
Place thermal bulb in front of external equalizer
line to avoid liquid from external equalizer line
interfering temperature detection of thermal
bulb.
將感溫胞配置於外部均壓管的前方以避免由均
壓管過來的液態冷媒影響到感溫胞的感應。