Final Refrigerant Pipe; Connections; Brazing Procedures - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

Figure 37. Pressure gauges 20 - 60 Ton units: front
view
Discharge
Connection
Figure 38. Pressure gauges 80 - 120 Ton units: front
view
Discharge
Connection
Suction
Connection
Final Refrigerant Pipe Connections
To access the refrigerant pipe connections, remove the
louvered side grills. See connection drawings in
Dimensions and Weights chapter..
These condensing units are shipped with a Nitrogen
holding charge. Install pressure gauges to the
appropriate access valve(s) and take a reading.
• If no pressure is present, see Leak Testing
Procedure section.
• If pressure is present, relieve the pressure before
attempting to unsweat the "seal" caps.
• If refrigerant connections are not capped, but are
"spun-end" tubes, use a tubing cutter to remove
the end from the pipe.
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 ! !
D D r r i i l l l l i i n n g g o o r r s s a a w w i i n n g g p p i i p p e e s s t t u u b b s s c c o o u u l l d d i i n n t t r r o o d d u u c c e e
c c o o p p p p e e r r c c h h i i p p s s i i n n t t o o t t h h e e s s y y s s t t e e m m a a n n d d c c a a u u s s 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 . .
D D o o n n o o t t d d r r i i l l l l a a h h o o l l e e i i n n t t h h e e s s e e a a l l c c a a p p s s o o r r s s a a w w t t h h e e e e n n d d s s
o o f f p p i i p p e e s s t t u u b b s s . .
SS-SVX11K-EN

Brazing Procedures

E E x x p p l l o o s s i i o o n n H H a a z z a a r r d d a a n n d d D D e e a a d d l l y y G G a a s s e e s s ! !
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 a a l l l l p p r r o o p p e e r r s s a a f f e e r r e e f f r r i i g g e e r r a a n n t t
h h a a n n d d l l i i n n g g p p r r a a c c t t i i c c e e s s c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s
i i n n j j u u r r y y . .
N N e e v v e e r r s s o o l l d d e e r r , , b b r r a a z z e e o o r r w w e e l l d d o o n n r r e e f f r r i i g g e e r r a a n n t t l l i i n n e e s s o o r r
Suction
Connection
a a n n y y u u n n i i t t c c o o m m p p o o n n e e n n t t s s t t h h a a t t a a r r e e a a b b o o v v e e a a t t m m o o s s p p h h e e r r i i c c
p p r r e e s s s s u u r r e e o o r r w w h h e e r r e e r r e e f f r r i i g g e e r r a a n n t t m m a a y y b b e e p p r r e e s s e e n n t t . .
A A l l w w a a y y s s r r e e m m o o v v e e r r e e f f r r i i g g e e r r a a n n t t b b y y f f o o l l l l o o w w i i n n g g t t h h e e
g g u u i i d d e e l l i i n n e e s s e e s s t t a a b b l l i i s s h h e e d d b b y y t t h h e e E E P P A A F F e e d d e e r r a a l l C C l l e e a a n n
A A i i r r A A c c t t o o r r o o t t h h e e r r s s t t a a t t e e o o r r l l o o c c a a l l c c o o d d e e s s a a s s a a p p p p r r o o p p r r i i a a t t e e . .
A A f f t t e e r r r r e e f f r r i i g g e e r r a a n n t t r r e e m m o o v v a a l l , , u u s s e e d d r r y y n n i i t t r r o o g g e e n n t t o o
b b r r i i n n g g s s y y s s t t e e m m b b a a c c k k t t o o a a t t m m o o s s p p h h e e r r i i c c p p r r e e s s s s u u r r e e b b e e f f o o r r e e
o o p p e e n n i i n n g g s s y y s s t t e e m m f f o o r r r r e e p p a a i i r r s s . . M M i i x x t t u u r r e e s s o o f f
r r e e f f r r i i g g e e r r a a n n t t s s a a n n d d a a i i r r u u n n d d e e r r p p r r e e s s s s u u r r e e m m a a y y b b e e c c o o m m e e
c c o o m m b b u u s s t t i i b b l l e e i i n n t t h h e e p p r r e e s s e e n n c c e e o o f f a a n n i i g g n n i i t t i i o o n n s s o o u u r r c c e e
l l e e a a d d i i n n g g t t o o a a n n e e x x p p l l o o s s i i o o n n . . E E x x c c e e s s s s i i v v e e h h e e a a t t f f r r o o m m
s s o o l l d d e e r r i i n n g g , , b b r r a a z z i i n n g g o o r r w w e e l l d d i i n n g g w w i i t t h h r r e e f f r r i i g g e e r r a a n n t t
v v a a p p o o r r s s p p r r e e s s e e n n t t c c a a n n f f o o r r m m h h i i g g h h l l y y t t o o x x i i c c g g a a s s e e s s a a n n d d
e e x x t t r r e e m m e e l l y y c c o o r r r r o o s s i i v v e e a a c c i i d d s s . .
E E x x p p l l o o s s i i o o n n H H a a z z a a r r d d ! !
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 c c o o u u l l d d r r e e s s u u l l t t i i n n
d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y o o r r e e q q u u i i p p m m e e n n t t o o r r p p r r o o p p e e r r t t y y - -
o o n n l l y y d d a a m m a a g g e e . .
U U s s e e o o n n l l y y d d r r y y n n i i t t r r o o g g e e n n w w i i t t h h a a p p r r e e s s s s u u r r e e r r e e g g u u l l a a t t o o r r f f o o r r
p p r r e e s s s s u u r r i i z z i i n n g g u u n n i i t t . . D D o o n n o o t t u u s s e e a a c c e e t t y y l l e e n n e e , , o o x x y y g g e e n n o o r r
c c o o m m p p r r e e s s s s e e d d a a i i r r o o r r m m i i x x t t u u r r e e s s c c o o n n t t a a i i n n i i n n g g t t h h e e m m f f o o r r
p p r r e e s s s s u u r r e e t t e e s s t t i i n n g g . . D D o o n n o o t t u u s s e e m m i i x x t t u u r r e e s s o o f f a a
h h y y d d r r o o g g e e n n c c o o n n t t a a i i n n i i n n g g r r e e f f r r i i g g e e r r a a n n t t a a n n d d a a i i r r a a b b o o v v e e
a a t t m m o o s s p p h h e e r r i i c c p p r r e e s s s s u u r r e e f f o o r r p p r r e e s s s s u u r r e e t t e e s s t t i i n n g g a a s s t t h h e e y y
m m a a y y b b e e c c o o m m e e f f l l a a m m m m a a b b l l e e a a n n d d c c o o u u l l d d r r e e s s u u l l t t i i n n a a n n
e e x x p p l l o o s s i i o o n n . . R R e e f f r r i i g g e e r r a a n n t t , , w w h h e e n n u u s s e e d d a a s s a a t t r r a a c c e e g g a a s s
s s h h o o u u l l d d o o n n l l y y b b e e m m i i x x e e d d w w i i t t h h d d r r y y n n i i t t r r o o g g e e n n f f o o r r
p p r r e e s s s s u u r r i i z z i i n n g g u u n n i i t t s s . .
Proper brazing techniques are essential when installing
refrigerant piping. The following factors should be kept
in mind when forming sweat connections.
• When copper is heated in the presence of air,
copper oxide forms. To prevent copper oxide from
forming inside the tubing during brazing, sweep an
inert gas, such as dry nitrogen, through the tubing.
Nitrogen displaces air in the tubing and prevents
oxidation of the interior surfaces. A nitrogen flow of
one to three cubic feet per minute is sufficient to
displace the air. Use a pressure regulating valve or
flow meter to control the flow.
• Ensure that the tubing surfaces to be brazed are
clean, and that the ends of the tubes have been
carefully reamed to remove any burrs.
• Make sure the inner and outer tubes of the joint are
symmetrical and have a close clearance, providing
an easy slip fit. If the joint is too loose, the tensile
I I n n s s t t a a l l l l a a t t i i o o n n M M e e c c h h a a n n i i c c a a l l
W W A A R R N N I I N N G G
W W A A R R N N I I N N G G
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