Charge The System With Oil And Refrigerant (Frigo Top 24 Rt-Dg R452A); Fill In The System Charge Sticker; Adjust The Compressor Intake Valve (Cro) - Webasto Frigo Top 24 Rt-D Einbauanweisung

9 | Vacuum and charge the system
9.5 Charge the system with oil and
refrigerant (Frigo Top 24 RT-DG
R452A)
Fig. 27 R452A, Condenser, high-pressure service port, position 6
1. Add 50 ml of oil in the system via the high-pressure service
port in the condenser.
2. Charge system with refrigerant. For the amount of refriger-
ant see chapter 11, "Technical data" on page 14.
3. Check system on leakage.
9.6

Fill in the system charge sticker

Fig. 28 System charge sticker R134a
Fig. 29 System charge sticker R452A
1. Write the correct amount of refrigerant used to charge the
system and the tonnes of CO
charge sticker.
2. Place the sticker next to the service point for charging.
9.7 Adjust the compressor intake valve
(CRO)
CRO adjustment is only valid for systems with refrigerant
R452A.
The CRO valve prevents overload of the compressor due to high
suction pressure. The CRO valve limits the compressor intake
pressure. A pressure limiting valve is only sensitive to its outlet
pressure, the valve Close on Rise of Outlet pressure.
NOTE
Adjust the CRO in one of the following operating
modes:
- Heating
- Defrost
- First start in a hot cell (T ≥ 25 °C)
12 / 84
equivalent on the system
2
Fig. 30 CRO and low-pressure service port
1 Compressor
10 Pressure regulator (CRO)
11 Low-pressure service port
CAUTION
Pressure in the return line is too high
Result: System damage.
u The maximum suction pressure must not exceed
2.2 bar.
Fig. 31 CRO Adjustment
10 Pressure regulator (CRO)
11 Low-pressure service port
1. Connect a manometer to the low-pressure service port (11).
2. Adjust the CRO pressure setting with an Allen key (6 mm).
Pressure setting: 2.2 bar (relative).
– Turn clockwise to increase the pressure. Turn counter-
clockwise to decrease the pressure.
– Turn the Allen key half a turn and monitor the pressure
change.
– Wait for 30 seconds between two CRO adjustments.
6248543A Frigo Top 24 RT-D _ RT-DG ML