Carrier 50CJ Serie Installations-, Betriebs- Und Wartungsanleitung Seite 73

27 - REFRIGERANT CONNECTIONS
Since it is forbidden to discharge R410A into the atmosphere (standard NF EN 378-2 paragraph 6.3.4.1), R410A may not be used in
pressure tests on the refrigerant connections.
- Remove the plugs from the CL2 shut-off valves and open the valves (anticlockwise).
- Refit the plugs on the shut-off valves.
- Use the charging valve (Schrader) on the CL2 to fill the outdoor module, two refrigerant pipes and evaporator with nitrogen and
helium (if you have a helium detector) up to a pressure of 10 bar.
- Check all the connections for leaks
R410A evacuation and charging
- Evacuate the pressure from the circuit.
- Connect the manifold to the gas charging valve (Schrader) on the CL2. Connect the vacuum pump.
- Evacuate the CL2, the two pipes and the evaporator to obtain a value of -0.1 Mpa (-76 cm Hg).
- Turn off the vacuum pump and make sure the pressure remains stable for five minutes.
- Disconnect the vacuum pump.
- Connect the R410A canister to the manifold, without tightening it.
- Open the valve on the R410A canister momentarily to drain the hose.
- Tighten the union on the manifold.
- Open the tap on the R410A canister to break the vacuum in the installation.
- Disconnect one of the wires from the low-pressure pressostat.
- Before starting up the compressor, check that the operations below have been carried out:
• Electrical connection (check that all the connections are correctly tightened and that the voltage is stable and in accordance
with the data on the manufacturer's data plate).
• Connecting the refrigeration lines.
• Pressure test.
• Evacuation.
- To charge with R410A fluid, if it is not possible to fill the unit with all of the charge with the compressor off, power up and start the
compressor (close the contact on the external control input):
For CL2 connected to CARRIER air handling units:
CL2 units are pre-charged. To this pre-charge, add the charge indicated in the air handling unit manual, plus the additional charge
below, depending on the length of your pipes.
CONDENCIAT CL2
28
35
50
65
75
Example: for 3 metres of pipes between the CL2 50 and the indoor unit, the additional charge will be 3x61g.
For other configurations:
- Top up the charge by checking the overheating and the subcooling.
Values normally used:
- Overheating: 5 to 6 K
- Subcooling:
• 3 to 4 K for an evaporation temperature of 10 °C
• 6 to 9 K for an evaporation temperature of 0 °C
- Once charging is complete, close the tap on the R410A canister.
- Stop the compressor and power off. Rewire the low pressure switch.
- Remove the charging device.
Shut-off valve plugs
Outdoor module charge (kg)
1,6
1,6
2,65
2,75
3
Additional charge (g/m)
55
58
61
70
101
73