Mitsubishi Electric ECOV-X37VA Manuel D'installation page 3

Contents
7. Refrigerant piping work ...........................................................................................25
7-1. General information ........................................................................................................ 25
7-1-1. Removing the bypass pipe.............................................................................. 25
7-1-2. Notes on water and contaminants................................................................... 25
7-1-3. Pipe size ......................................................................................................... 26
7-1-4. Height difference between devices ................................................................. 26
7-1-5. Supporting the pipes ....................................................................................... 26
7-1-6. Notes on contaminants while flaring the pipes................................................ 26
7-2. Installation of suction pipe .............................................................................................. 26
7-2-1. Installing the horizontal pipe............................................................................ 26
7-3. Installation of liquid pipe ................................................................................................. 27
7-3-1. Installing the solenoid valve <liquid>............................................................... 27
7-3-2. Installing the strainer <liquid> ......................................................................... 27
7-3-3. Installing the dryer........................................................................................... 27
7-3-4. Installing the sight glass .................................................................................. 27
7-3-5. Installing a pressure relief device.................................................................... 27
7-3-6. When the ambient temperature around the pipe rises high ............................ 27
7-3-7. When the evaporator is installed below the main suction pipe ....................... 27
7-3-8. When there are multiple evaporators in the system........................................ 27
7-4. Installation of heat recovery port..................................................................................... 28
7-5. Connecting pipes ............................................................................................................ 29
7-5-1. Brazing ............................................................................................................ 29
7-6. Pipe routing: Single and collective installations .............................................................. 30
8. Air tightness test/Vacuum drying ...........................................................................31
8-1. Air tightness test ............................................................................................................. 31
8-1-1. Purpose of air tightness test............................................................................ 31
8-1-2. Air tightness test pressure............................................................................... 31
8-1-3. Air tightness test procedure ............................................................................ 31
8-1-4. Refrigerant leakage detection ......................................................................... 32
8-2. Vacuum drying ................................................................................................................ 32
8-2-1. Purpose of vacuum drying .............................................................................. 32
8-2-2. Vacuum drying procedure ............................................................................... 32
8-2-3. Connection of the vacuum pump .................................................................... 34
8-2-4. Procedures for stopping the vacuum pump .................................................... 35
8-2-5. Required precision of vacuum gauge.............................................................. 35
8-2-6. Operating the valve check joint ....................................................................... 35
8-2-7. Parts names .................................................................................................... 36
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Pages
WT09614X03_GB