Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Instrukcja Instalacji Pobierz pdf (Strona 47)

VRF-SVN33A-EN 47

Service: Pump Down Process

The pump down process pulls all of the refrigerant in the system into the outdoor unit condenser

so that repairs can be made to the system.

Collecting Refrigerant into a Refrigerant Container

The maximum amount of refrigerant that can be put into a mini outdoor unit is 176.4 oz. Because

of this limitation, some of the refrigerant should be removed from the system to a refrigerant

container before performing the pump down process.

1. Have ready an empty refrigerant container, a weighing scale, and a manifold gauge.

2. Determine through calculation the current amount of refrigerant in the system.

3. Connect the refrigerant container to the mini outdoor unit and operate 50% of all indoor units

in cooling mode.

Figure 23. Removing refrigerant from the system to a refrigerant container

4. After 10 minutes of operation, use the manifold gauge to check the liquid side pressure. When

the pressure is higher than 420.61 psig (2.9 MPa), decrease the number of operating indoor

units.

5. Check the pressure again. When it has decreased to less than 420.61 psig (2.9 MPa), open the

liquid side service valve and the manifold gauge valve that is connected to the liquid pipe to

let the refrigerant run into the refrigerant container.

Important: The amount of refrigerant that can be put into the refrigerant container should be

approximately 50% of the total refrigerant in the system. Do not fill the refrigerant

container more than 85% of its capacity (average temperature 77°F).

6. Use the scale to determine how much refrigerant that has been collected.

7. After the proper amount of refrigerant has been collected, turn off the manifold gauge valve and

the liquid side service valve.

WARNING

Refrigerant under High Pressure!

Failure to follow code concerning could result in an explosion which could result in death or

serious injury or equipment damage. The refrigerant container used to collect refrigerant from

the system must be one that is exclusively designed for that purpose.

Outdoor unit

Scale

Liquid side

service valve

Gas side

service valve

Manifold gauge

valve 1

Manifold gauge

valve 2

Refrigerant

container

valve

1 2 ... 42 43 44 45 46 47 48 49 50 51 52

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Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Instrukcja Instalacji Strona 47

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