Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Refrigerant Line Restrictions

There are three refrigerant line restrictions:

1. Suction Line - A restriction will cause low suction pressure at the compressor, low discharge pressure and little or no cooling.

2. Discharge Line - A restriction will cause the pressure relief valve to open.

3. Liquid Line - A restriction will be caused by low discharge and suction pressure, and insufficient cooling.