Checking System Tightness

Checking System Tightness (Vacuum Pumping) With RHS 3000
The following must be observed when performing the tightness check. Firstly, the national regulations in the particular country must be followed. Secondly, the following procedure must be followed:
- Check compressor oil level and top up as required before vacuum-pumping A/C system.
Servicing System

- The main purpose of vacuum-pumping is to evacuate any moisture present in the system. The second purpose is to ensure that no leakage is present. When vacuum-pumping has been completed and the system is completely tight, fill the system with the correct quantity and type of refrigerant.
Specifications

- Vacuum-pump system for approx. 50 minutes. Procedure commences with operation one.

- Carry out a final check using leak detector 9511207.

1. Press EVACUATION (3) push-button and allow vacuum-pumping to continue for 50 minutes. Vacuum will then be 0.7-1.0 bar (10.2-14.5 psi). To ensure that all moisture has been evacuated, it is essential that vacuum-pumping is carried out for at least 50 minutes.
2. Press and hold down VACUUM CHECK (6) push-button for 4 minutes. Vacuum must not fall by more than one LED on scale (11) during this period.
3. Press VACUUM CHECK (6) push-button again. Unit will then revert to basic status (OFF).