Charging Of Refrigerant; Charging Of An Empty Unit - Maersk Container Industry Star Cool SCI-20 Operating And Service Manual

4. Remove the electrical coils and mount permanent magnet on the two electronic expansion
valves, pos. 16 and 18 (P & I diagram).
5. Open the discharge stop valve of the service gauge manifold.
6. Carefully open the hand valve of the pressurized gas bottle until the two gauges of the service
gauge manifold show a pressure of 12 BarE (174 Psi).
7. Close the discharge stop valve of the service gauge manifold.
8. Do a leakage detection (see "22.7 Leakage detection" p. 86).
9. Leave the unit pressurized for minimum 2 hours. If the pressure gauges still show 12 BarE (174
Psi) after 2 hours, the unit has no leaks.
10. If the pressure gauges are below 12 BarE (174 Psi), perform a leakage detection (see "22.7
Leakage detection" p. 86).
11. Disconnect the pressurized gas bottle.
12. Open the discharge stop valve on the service gauge manifold to release the pressure from the
unit.
13. Do a pump down of unit (see "22.4 Pump down of unit" p. 84).
14. Charge the unit (see "22.6 Charging of refrigerant" p. 85).

22.6 Charging of refrigerant

Always charge refrigerant according to name plate on unit (R134a or R513A). You must NOT mix
R134a and R513A, avoid it at all times.

22.6.1 Charging of an empty unit

The power to the unit must be off. Before powering off unit, it might be helpful to use/run the con-
denser fan motor for fast dilution of any refrigeration leak.
The charging of an empty unit is done by weight, by the following procedure:
1. Pump down unit (see "22.4 Pump down of unit" p. 84).
2. Open the discharge service valve completely, pos. 5 (P & I diagram).
3. Close the HP valve on the service gauge manifold.
4. Connect the HP service gauge manifold to the liquid charging valve, pos. 11 (P & I diagram).
5. Close economizer service valve, pos. 14 (P & I diagram).
6. With an installed service gauge manifold to the evacuation points, LP on: pos. 27 and
HP on: Liquid charging valve pos. 11 (P & I diagram).
7. Connect manifold service hose to refrigerant bottle and purge as needed.
8. Place a refrigerant bottle on a scale for weighing. Record the weight of the refrigerant bottle.
9. Set refrigerant bottle for liquid charging and open refrigerant bottle hand valve.
10. Check that the service valve pos. 26 is fully open and 1 turn closed, (for service manifold
gauge reading, keep the manifold gauge LP valve closed). Before operating the suction service
valve, loosen the gland seal by ¼ turn before you move the spindle. Once finished, tighten the
gland seal and put on the protective spindle cap.
11. Open the HP valve on the service gauge manifold slowly, only allowing liquid R134a or R513A to
pass.
12. Observe the scale and close the hand valve located on the refrigerant bottle, when the correct
amount of refrigerant has been charged. The refrigerant charge of the unit is: 4.5 kg R134a or
R513A.
a. To speed up the charging time, it is recommended to start up the unit in Manual mode, with
a compressor speed not more than 20 Hz - until finishing charging.
13. Open the economizer service valve, pos. 14 (P & I diagram).
14. Close the valves on the service gauge manifold.
15. Open all the service valves fully, on the compressor, pos. 5, 26, and 30 (P & I diagram).
Before operating the suction service valve, loosen the gland seal by ¼ turn before you move
the spindle. Once finished, tighten the gland seal and put on the protective spindle cap.
16. Remove all tools again.
17. Make sure to install all valve caps again.
18. Operate the unit as normal.
Note: If the correct amount of refrigerant is not charged by this procedure, follow the procedure
described in charging of unit low on charge in this manual.
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