Refrigerant System; Interconnecting Piping - Trane IntelliPak SCWF 20 Installation, Operation And Maintenance Manual

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
bushing in the plastic bag. Run the wires through
the bushing and connect wires to the unit.
5. After connecting wires and the static pressure tube,
raise the coil box up against the unit and install the
mounting screws. Recommended lifting points are
at each end of the coil box.
6. Avoid routing wires over devices and sharp edges.
Use wire ties about every 12 inches to secure wires
to other wire harnesses.
7. Move the entering air temperature sensor upstream
of the coil to ensure proper operation.

Refrigerant System

Trane Water Cooled Commercial Self-Contained units
ship factory charged with R-410A refrigerant.
Trane Air Cooled Commercial Self-Contained and
Condenser units ship with a dry nitrogen holding
charge.
Before installing refrigerant piping, verify holding
charge is present. Momentarily depress the CSC
suction or discharge line (and condenser liquid line)
access port valves.
If charge is present, continue with piping installation.
If no nitrogen escapes the access valve, leak test the
unit refrigerant system to determine the leak source,
and repair. See Maintenance section,
Test Procedure," p. 92. After finding leak, remove test
pressure and repair leak using proper brazing
procedures. See Maintenance section,
Procedures," p. 93. Retest unit(s) to ensure all leaks are
repaired. Continue with piping installation.

Interconnecting Piping

Refrigerant piping must be properly sized and applied.
These two factors have a significant effect on both
system performance and reliability.
Using , select proper liquid and discharge line size. Unit
connection sizes are also shown. Install
interconnecting piping using proper installation and
brazing procedures.
Work on only one circuit at a time to minimize system
exposure to potentially harmful moisture in the air.
Before installing piping verify compressor oil levels are
near top of sight glass or above.
N N o o t t e e : : CSC units (and replacement compressors) ship
fully charged with POE oil from the factory.
Scroll compressors use POE oil (OIL00079, quart
container or OIL00080, gallon container), DO
NOT substitute.
40
"Refrigerant Leak
"Brazing
Capped discharge and liquid line connections are
located near bottom, left side of the indoor unit. CCRC/
CIRC connections are located in the unit front, at top.
Remove caps with a tube cutter to minimize risk of
getting chips inside piping.
N N o o t t e e : : When facing the control panel side of the unit.
Circuit #2 is always on the left and Circuit #1 is
always on the right.
Cleanliness is extremely important during system
installation to minimize residual contaminants, such as
oxidization and scale.
Attach vacuum pump and begin evacuation as soon as
piping installation is complete. This starts system
dehydration and helps prevent POE compressor oil
contamination. This will also indicate large leaks if
vacuum does not hold (below 400 microns and hold for
2 hours). Complete LeakTest and Evacuation (for
procedures, see "Refrigerant Leak Test Procedure," p.
92 and "System Evacuation Procedures," p. 93
Maintenance section) before starting
Refrigerant Charging," p.
N N o o t t e e s s : :
• Installation of a field supplied discharge line
access port near indoor units with optional
discharge line ball valve will make high side
pressure measurements easier during leak
test.
• UseType "L" refrigerant grade copper
tubing only.
N N O O T T I I C C E E
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r r e e m m o o v v e e f f r r o o m m 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 o o i i l l a a n n d d c c a a n n 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 s s . .
T T o o p p r r e e v v e e n n t t P P O O E E o o i i l l f f r r o o m m a a b b s s o o r r b b i i n n g g w w a a t t e e r r , , t t h h e e
s s y y s s t t e e m m s s h h o o u u l l d d n n o o t t r r e e m m a a i i n n o o p p e e n n f f o o r r l l o o n n g g e e r r t t h h a a n n
n n e e c c e e s s s s a a r r y y . . W W h h e e n n o o p p e e n n , , d d r r y y n n i i t t r r o o g g e e n n s s h h o o u u l l d d f f l l o o w w
t t h h r r o o u u g g h h t t h h e e p p i i p p i i n n g g . . O O n n l l y y n n e e w w o o i i l l c c o o n n t t a a i i n n e e r r s s s s h h o o u u l l d d
b b e e u u s s e e d d f f o o r r s s e e r r v v i i c c e e a a n n d d m m a a i i n n t t e e n n a a n n c c e e . . A A l l w w a a y y s s u u s s e e
t t h h e e s s m m a a l l l l e e s s t t c c o o n n t t a a i i n n e e r r s s i i z z e e r r e e q q u u i i r r e e d d f f o o r r t t h h e e j j o o b b
r r e e q q u u i i r r e e m m e e n n t t s s . . A A l l w w a a y y s s l l e e a a v v e e t t h h e e o o i i l l c c o o n n t t a a i i n n e e r r
t t i i g g h h t t l l y y s s e e a a l l e e d d u u n n t t i i l l t t i i m m e e o o f f u u s s e e . . D D o o n n o o t t r r e e u u s s e e o o i i l l
t t h h a a t t h h a a s s b b e e e e n n o o p p e e n n e e d d . .
in
"Preliminary
41.
SCXF-SVX01Q-EN