Must I also place the coolant bottle on the scale if I only want to evacuate the system?
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No. All you need to do to evacuate the system is press the function button “V”. The RO-Klima will then evacuate for the preset time and finish the evacuation with an integrity test of 2 minutes.
Must I zero the scale with the coolant bottle on the scale?
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The scale should be zeroed when it has been removed from the casing of the RO-Klima and is standing on a firm and level surface. After zeroing, the coolant bottle (for 1-litre and 2.5-litre bottles, together with the bottle connector) can be placed on the weighing cell.
How do I zero the scale?
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Remove the scale from the casing of the RO-Klima and place it on a firm and level surface. Now press the “Minus” and “R” buttons simultaneously. The display shows “tare”. Confirm the zeroing/taring by pressing the function button “C”. This concludes the zeroing/taring process. The display shows “0.000”.
I have filled coolant into the system, but still need more. Do I have to evacuate the cooling circuit again?
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No, because the coolant circuit has already been evacuated, and this would only allow the existing coolant in the system to escape into the atmosphere, and you would have to add the same quantity of coolant already filled in once again. Enter the required additional quantity of coolant to be filled in by pressing and holding the function button “C” (with “Plus” and “Minus”), confirm the selected value by pressing “C” again and then press the function button “C” again in order to fill the additional quantity of coolant into the cooling circuit.
When I want to top up with coolant after evacuation of the installed coolant lines, do I also have to evacuate the black capillary hose first?
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Yes. Before evacuating the coolant lines, attach the capillary hose to the T-piece of the RO-Klima, open the tap and confirm by pressing the button “V”. The capillary hose will be evacuated after a short time of approx. half a minute. Close the tap and disconnect the capillary hose from the T-piece again. You can now connect the capillary hose to the coolant bottle (or when using 1-litre or 2.5-litre coolant bottles, to the bottle connector).
Can I top the system up with coolant as often as necessary, up until the air-conditioning system works properly?
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No, because sooner or later the pressure in the coolant line of the air-conditioning system will be higher than the bottle pressure and no more coolant will be able to flow in.
What can I do if no coolant flows from the coolant bottle into the cooling circuit?
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You can increase the pressure in the coolant bottle by warming it up. Warming sleeves are available for this purpose, although you can also use a normal hot-air blower or hair-dryer. This is clarified using the following example: Bottle pressure at room temperature (20° C) = 40 bar, bottle pressure at 30° C = approx. 53 bar. Alternatively you can also proceed as follows: Connect one filler hose only to the service valve on the suction side of the air-conditioning system. Switch the air-conditioning system on and draw the required quantity of coolant into the cooling circuit, using the scale to check the quantity.
Coolant is bottled in liquid form. However, I have read that there are certain coolants that can only be filled into the cooling circuit in gas form. Is that correct?
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When flowing out from the bottle, which is under high pressure, the liquid coolant vaporises immediately. This takes place both directly behind the capillary hose, when flowing out into the filling hose of the RO-Klima and when using conventional tools when flowing out of the capillary hose into the installation aid. This ensures that only gaseous coolant is filled into the cooling circuit.
The RO-Klima shows “STOP” on the display and the pump is not running. Why is this?
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The cooling circuit is under pressure, i.e. the operator is trying to evacuate a pressurised system. This is registered by the pressure sensor in the RO-Klima and prevents the vacuum pump from starting. Proceed as follows: Ensure that the cooling circuit is depressurised. For this purpose, it may be necessary to return the cooling circuit to the delivery condition, i.e. to return all coolant to the external device. Please do this according to the operating instructions of the equipment manufacturer. The lines to be evacuated can then be depressurised, e.g. via the service valve of the air-conditioning system, and then evacuation started.
