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VACUUM TESTING

Step 10

Leaking Test

Leak test each indoor unit, one unit at a time. Repeat the leak test sequence for each indoor unit.

1. Connect the charging hose of the manifold valve to charge the end of the low-pressure valve.

2. Add dry nitrogen to a pressure of 200 lbs.Tightly close both high- and low-pressure valves.

3. Leak-test flare fittings with soap bubbles. If no leak is detected, release nitrogen.

Step 11

System Vacuum and Charge

Evacuate each indoor unit, one unit at a time. Repeat the evacuation sequence for each indoor unit.

C UTION

UNIT DAMAGE HAZARD

Never use the system compressor as a vacuum pump. It may result in equipment damage

or improper system operation.

Refrigerant pipes and indoor coil 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.

NOTE: Always break a vacuum with dry nitrogen.

Using Vacuum Pump

1. Completely tighten flare nuts A, B, C, D,

connect manifold gauge charge hose to a

charge port of the low side service valve.

2. Connect charge hose to vacuum pump.

3. Fully open the low side of manifold gauge.

See figure at right.

4. Start vacuum pump.

Indoor Unit

Refrigerant

Outdoor Unit

Low Side

High Side

Service Valve

Manifold Gauge

500 microns

Low Side Valve

High Side Valve

Charge Hose

Vacuum Pump

Low Side Valve

VACUUM TESTING

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

6. After evacuation is complete, fully close the low side of manifold gauge and stop

operation of vacuum pump.

7. The factory charge contained in the outdoor unit is good for up to 25 ft. (8 m) of line length.

NOTE: For refrigerant lines longer than 25 ft (8 m), add add'l refrigerant per foot of extra

piping up to the maximum allowable length. See System Requirement section on page 4

for more info.

8. Disconnect charge hose from charge connection of the low side service valve.

9. Fully open service valves B and A.

10. Securely tighten caps of service valves.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns

and a vacuum gauge 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.

5000

4500

4000

3500

3000

2500

2000

1500

1000

500

Leak in

System

Vacuum Tight

too Wet

Tight Dry

System

Deep Vacuum Graph