Airwell 7SP091170, Руководство по обслуживанию

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Installation details
Installation
101
4. Installation details
Air and moisture in the refrigerant system have undesirable effects as below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze and block capillary tubing.
●
Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out,
the pipes have leakage.
4.1. Air purging with vacuum pump
4.1.1
For outdoor unit YCZ218
1) Completely tighten the flare nuts of the indoor and each braches of outdoor unit, confirm that both the
branch valves(Gas and liquid) are set to the closed position.
2) Connect the charge hose with the push pin of handle Lo to the branch valve(Gas) service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the
pressure
can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm
that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
7) Open the branch valve(Gas) about 45° counterclockwise for 6 or 7seconds after the gas
coming out, then close the valve again. Make sure the pressure display in the pressure indicator is a little
higher than the atmosphere pressure. Then remove the charge hose from the branch valve(Gas).
8) Fully open the branch valve(Gas and liquid) and securely tighten the cap of the valves.
9) Perform the same procedure to the other branch valve.
Lo Hi
Manifold Valve
Vacuum pump
Handle Lo
Handle Hi
Charge Hose
Branch valve
(Gas)
Outdoor Unit
To
indoor unit
Pressure gauge
Branch valve
(Liquid)
Open
Close
Vacuum outdoor unit YCZ218