Check and Test Operation 
Check
Be sure to check the following again after completion of installation.
1.Check the piping connection area for any gas leakage.
Outdoor connection area
Indoor
connection area 
2. Is the drain hose properly connected?
3. Is the insulation of the piping in good condition? | 4. Is grounding properly made? |
Pipe insulator (Over 7mm foamed
polyethylene or EPDM foam)
More than 30cm 
Pipie connection part insulator (Over
5mm foamed polyethylene)
installation part _45