System Evacuation; Insulating And Isolating Refrigerant; Lines - Trane TWA0724-A Series Installation, Operation And Maintenance Manual

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Table of Contents

After the brazing operation of refrigerant lines to both

the outdoor and indoor unit is completed, the field

brazed connections must be checked for leaks.

Pressurize the system through the gauge port with dry

nitrogen to 200 psi. Use soap bubbles or other leak-

checking methods to ensure that all field joints are leak

free. If not, release pressure, repair and repeat leak test.

System Evacuation

1. After completion of leak check, evacuate the

system.

2. Attach appropriate hoses from manifold gauge to

gas and liquid line pressure taps.

N N o o t t e e : : Unnecessary switching of hoses can be

avoided and complete evacuation of all lines

leading to sealed system can be

accomplished with manifold center hose and

connecting branch hose to a cylinder of R-

410A/R–22 and vacuum pump.

3. Attach center hose of manifold gauges to vacuum

pump.

N N O O T T I I C C E E

O O p p e e r r a a t t i i n n g g U U n n d d e e r r V V a a c c u u u u m m ! !

F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w t t h h e e s s e e i i n n s s t t r r u u c c t t i i o o n n s s w w i i l l l l r r e e s s u u l l t t i i n n

c c o o m m p p r r e e s s s s o o r r f f a a i i l l u u r r e e . .

D D o o n n o o t t o o p p e e r r a a t t e e o o r r a a p p p p l l y y p p o o w w e e r r t t o o t t h h e e c c o o m m p p r r e e s s s s o o r r

w w h h i i l l e e u u n n d d e e r r a a v v a a c c u u u u m m . .

4. Evacuate the system to hold a 500 micron vacuum.

5. Close off valve to vacuum pump and observe the

micron gauge. If gauge pressure rises above 500

microns in one minute, then evacuation is

incomplete or the system has a leak.

6. If vacuum gauge does not rise above 500 microns in

10 minutes, the evacuation should be complete.

N N O O T T I I C C E E

E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !

C C h h a a r r g g e e w w i i t t h h a a c c c c e e s s s s p p o o r r t t o o n n t t h h e e l l i i q q u u i i d d l l i i n n e e o o n n l l y y . .

7. With vacuum pump and micron gauge blanked off,

open valve on refrigerant cylinder and allow

refrigerant pressure to build up to about 80 psig.

8. Close valve on the refrigerant supply cylinder. Close

valves on manifold gauge set and remove

refrigerant charging hoses from liquid and gas

gauge ports.

9. Leak test the entire system. Using proper

procedures and caution, as described in the

previous section, repair any leaks found and repeat

the leak test.

SSP-SVX001D-EN

Insulating and Isolating

Refrigerant Lines

Insulate the entire suction line with refrigerant piping

insulation. Also insulate any portion of the liquid line

exposed to temperature extremes. Insulate and isolate

liquid and suction lines from each other. Isolate

refrigerant lines from the structure and any duct work.

I I m m p p o o r r t t a a n n t t : :

1. To prevent possible noise or vibration

problems, be certain to isolate

refrigerant lines from the building.

2. All suction and hot gas bypass piping (if

installed) should be insulated from the

termination in the air handler to the

condensing unit cabinet entry. Failure

to do so can cause condensate drip off

and performance degradation.

3. Prior to starting a unit, it is advisable to

have the approved oils available in the

event oil needs to be added to the

system.

4. Refer to Application Guide SS-

APG008*-EN for units needing

additional oil and for oil amounts.

N N O O T T I I C C E E

E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !

T T h h i i s s i i s s P P O O E E o o i i l l , , w w h h i i c c h h r r e e a a d d i i l l y y a a b b s s o o r r b b s s m m o o i i s s t t u u r r e e . .

A A l l w w a a y y s s u u s s e e n n e e w w o o i i l l a a n n d d n n e e v v e e r r l l e e a a v v e e c c o o n n t t a a i i n n e e r r s s

o o p p e e n n t t o o a a t t m m o o s s p p h h e e r r e e w w h h i i l l e e n n o o t t i i n n u u s s e e . .

Table 4. R-410A TWA approved oils

Unit Model Number

TWA060, TWA072,

TWA0764DA, TWA0764DD,

TWA0904*A, TWA0904*D,

TWA1014DD, TWA1204*D,

TWA156, TWA180, TWA201,

TWA240

TWA1014DA, TWA1204*A

Table 5. R-22 TWA approved oils

Unit Model Number