Refrigerant Charge - Astralpool ASTRAL CDP Serie Manual Técnico. Puesta En Marcha Y Funcionamiento

9

REFRIGERANT CHARGE

For the procedures described below, we recommend you contact a professional specialised in
heating and air conditioning units.
DRAINING THE COOLING CIRCUIT
It is imperative to drain the cooling circuit before charging the refrigerant.
First draining procedure:
1st. Connect the gauge tubes to the intake pressure lines of the circuit (low pressure)
and to the return pressure lines (high pressure).
2nd. Connect the main line of the gauge to the vacuum pump.
3rd. Open all the valves, including the solenoid and the regulating valves.
4th. Open the valves of the gauge (LO = low pressure valve / HI = high pressure valve).
5th. Activate the vacuum pump and wait until the circuit is completely drained.
6th. Close all valves or stopcocks and disconnect the vacuum pump.
REFRIGERANT GAS CHARGE
The equipment uses R-407-C class refrigerant, which is a blend of 3 different gases with
different properties.
This is the reason why the gas taken from the refrigerant bottle must be introduced in the low-
pressure circuit by means of a charger (expansion system).
After having discharged the cooling circuit, and after having installed the charger and connected
the flexible tubes of the gauge to the high and low-pressure circuits, we can proceed with the
charge:
1st. Connect the main line of the gauge to the R-407C bottle stopcock.
2nd. Open the bottle stopcock and purge the section of tubing.
3rd. Open the high-pressure and the low-pressure valves.
4th. Pressurise the equipment to equal the pressure of the bottle.
5th. Close all gauge valves.
6th. Start the unit.
7th. Open the low-pressure valve until the pressure is 1 bar above the trip point of the
low-pressure switch.
8th. Once in a while, close the LO valve of the gauges in order to confirm the real
pressure of intake.
9th. Verify that the outflow pressure is not above the normal range for normal working
conditions.
10th. When the correct weight of refrigerant has been charged, close the LO valve.
11th. When the equipment is functioning according to the specified working conditions,
close the valve of the charging bottle and disconnect the tubes taking precautions
regarding gas purge.
12th. Place the caps on the supply and return lines of the compressor.
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