Welding With Nitrogen Blowing - Samsung MCM-D201N Installation Manual

Installing an AHU KIT

Welding with nitrogen blowing

① ②
1. When welding a pipe, perform nitrozen blowing work.
- If you didn't blow the nitrogen for pipe welding, many oxides would be accumulated inside the pipe, which may cause
the valve of refrigerant system and compressor to operate abnormally.
2. When inputting the nitrogen gas, the rate of flow for nitrogen gas should be less than 0.02 MPa using the reducing
valve. (You should be able to feel the degree on your skin.)
Installing ASS'Y EEV(Not provided)
1. Check that ASS'Y EEV is installed inside the AHU.
- Since dew condensation may occur around the ASS'Y EEV pipe, install the ASS'Y EEV at a place where condensate water
can be drained.
2. Check whether IN and OUT pipe connection is correct.
3. Essential to check the ASS'Y EEV main body is installed vertically.
- ASS'Y EEV main body should be installed within the range of +/- 15˚ of standard for vertical installation. Otherwise, the
reliability of ASS'Y EEV cannot be guranteed.
4. Fix the EEV to AHU fixing groove firmly as shown in the image A below.
Clamp(Work area for AHU
manufacturer)
Insulator(Work area for AHU
manufacturer)
A B
A: High pressure pipe from outdoor unit(IN)
- Diameter : Ø12.7 mm
B: Low pressure pipe to AHU heat exchanger(OUT)
- Diameter : Ø12.7 mm
14
③
⑥
A
Insulator
Clamp
➀
④ ⑤
➁
➂
➃
⑥
➄
➅
Standard for vertical
installation
30°
Refrigerant pipe
Location for welding
Tape
Hands valve
Reducing valve
Nitrogen gas
Standard for vertical
installation
30°