Expansion Valve System-Subcooling

Expansion Valve System-Subcooling Charge Method
1. Fully open both base valves.
2. Connect service gauge manifold to base-valve service
parts making sure lines are purged. Run system at least
10 minutes to allow pressure to stabilize.
3. Temporarily install the thermometer to liquid (small) line
near condensing unit. Be sure that the contact between
thermometer and line is good. Wrap thermometer with
insulating material to ensure accurate reading.
4. Referring to the Saturated Liquid Line Temperature Table,
adjust charge to obtain a temperature 12-15°F below the
saturated liquid temperature.
Example:
If liquid pressure is 260 psig refer to Saturated Liquid
Temperature chart, 260 psig = 120° saturated temperature.
Subtract liquid line temperature obtained from thermostat
connect to liquid line. The liquid line temperature must be
12° -15° cooler than the refrigeration saturation temperature