Outdoor Unit

Installation Manual

8 EVACUATE AND DEHYDRATE THE SYSTEM

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor heat exchanger should be evacuated using the recommended deep vacuum method of 500 microns. The alternate triple evacuation method may be used if the procedure outlined below is followed. Always break a vacuum with dry nitrogen.

„SYSTEM VACUUM AND CHARGE

Using Vacuum Pump

1.Completely tighten flare nuts A, B, C, D, connect manifold gage charge hose to a charge port of the low side service valve.

Service Valve

Outdoor Unit

 

 

 

 

Refrigerant

 

Indoor Unit

 

 

 

A

Low Side

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

High Side

 

D

 

 

Service Valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.Connect charge hose to vacuum pump.

3.Fully open the low side of manifold gage.

Manifold

Manifold Gage

500 microns

Low side valve

High side valve Charge hose

Charge hose

Vacuum pump

Low side valve

4.Start vacuum pump.

5.Evacuate using either deep vacuum or triple evacuation method.

6.After evacuation is complete, fully close the low side of manifold gage and stop operation of vacuum pump.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water.

Deep Vacuum Graph

 

5000

 

 

 

 

 

 

 

 

4500

 

 

 

 

 

 

 

 

4000

 

 

 

 

 

 

 

 

3500

 

 

 

 

 

 

LEAK IN

 

 

 

 

 

 

 

SYSTEM

MICRONS

3000

 

 

 

 

 

 

 

 

 

 

 

 

 

2500

 

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

1500

 

 

 

 

VACUUM TIGHT

 

 

 

 

 

 

 

 

 

 

 

TOO WET

 

1000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

500

 

 

 

 

 

TIGHT DRY

 

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

 

 

 

MINUTES

 

 

 

Triple Evacuation Method

The triple evacuation method should only be used when vacuum pump is only capable of pumping down to 28 in. of mercury vacuum and system does not contain any liquid water.

Refer to “Triple Evacuation Method chart” and proceed as follows:

1.Pump system down to 28 in. of mercury and allow pump to continue operating for an additional 15 minutes.

2.Close service valves and shut off vacuum pump.

3.Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.

4.Close service valve and allow system to stand for 1 hr. During this time, dry nitrogen will be able to diffuse throughout the system absorbing moisture.

5.Repeat this procedure as indicated in the chart. System will then be free of any cotaminants and water vapor.

17-EN

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Toshiba RAV-SP360AT2-UL Evacuate and Dehydrate the System, Using Vacuum Pump, Deep Vacuum Method, Triple Evacuation Method
Page 17 Page 19

RAV-SP420AT2-UL, RAV-SP300AT2-UL, RAV-SP360AT2-UL specifications

Toshiba has established itself as a leader in HVAC technology, providing solutions that cater to diverse climate control needs. Among its notable models are the Toshiba RAV-SP300AT2-UL, RAV-SP420AT2-UL, and RAV-SP360AT2-UL. Each of these units is designed to deliver efficient cooling and heating, suitable for both residential and commercial applications.

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In conclusion, Toshiba's RAV-SP300AT2-UL, RAV-SP420AT2-UL, and RAV-SP360AT2-UL represent the forefront of HVAC innovation. With their unique features, energy efficiency, and advanced technologies, these air conditioning systems provide reliable performance tailored to the needs of users, ensuring comfort and satisfaction in any environment.
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