Evacuating

EVACUATING PROCEDURE

Adapter Valves:

1. Completely tighten low pressure and high pressure adapter valves.
2. Open high and low pressure valves of manifold gauge set and additional valve.
3. Run vacuum pump.

Pressure Gauge:

4. Perform evacuation for more than five minutes to stabilize the vacuum inside the system. Check to ensure that the low pressure gauge indicates -98.6 to -101.3 kPa (-740 to -760 mmHg, -29.13 to -29.92 in HG).
5. Shut off high and low pressure valves and additional valve.

CHECKING AIRTIGHTNESS

High And Low Pressure Gauges:

1. Shutoff high and low pressure valves and additional valve, and leave the system as it is for 5 to 10 minutes.
2. Make sure that the needle of low pressure gauge will not move back toward atmospheric pressure side (gauge pressure 0).

If any reverse movement Is noted, it indicates poor system air-tightness. Service the system until airtightness Is complete. It pressure changes approx. 13.3 kPa (100 mmHg, 3.94 in HG). In 10 minutes, the refrigerant in the system will be exhausted in about one month.

EVACUATION
If no abnormality is found during airtightness check, perform evacuation again for more than 20 minutes.

1. Run vacuum pump.
2. Open high and low pressure valve and additional valve.
3. Evacuate for more than 20 minutes.
4. Close high and low pressure valves and additional valve.