Table of Contents
Advertisement
Before installing refrigerant piping, verify holding
charge is present. Momentarily depress the MSC
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.
66. After finding leak, remove test
pressure and repair leak using proper brazing
procedures. See Maintenance section,
Procedures," p.
67. Retest unit(s) to ensure all leaks are
repaired. Continue with piping installation.
Braze suction and liquid lines between evaporator
module and condensing unit cassettes.
See Maintenance section,
Procedure," p. 66 /"Brazing Procedures," p.
Figure 17. Braze suction and liquid lines
Interconnecting Piping
Refrigerant piping must be properly sized and applied.
These two factors have a significant effect on both
system performance and reliability.
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.
PKG-SVX027C-EN
"Refrigerant Leak
"Brazing
"Refrigerant Leak Test
67.
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
Before installing piping verify compressor oil levels are
near top of sight glass or above.
N N o o t t e e : : MSC units (and replacement compressors) ship
fully charged with POE oil from the factory.
Scroll compressors use POE 32 oil, DO NOT
substitute.
Capped discharge and liquid line connections are
located near bottom, left side of the condensing unit
cassette.
Remove caps with a tube cutter to minimize risk of
getting chips inside piping.
Cleanliness is extremely important during system
installation to minimize residual contaminants, such as
oxidization and scale.
T T i i g g h h t t l l y y strap TXV bulbs to horizontal run of each
suction line and insulate. 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
Leak Test and Evacuation (for procedures, see
"Refrigerant Leak Test Procedure," p. 66
Evacuation Procedures," p. 68
before starting
"Preliminary Refrigerant Charging," p.
34.
N N o o t t e e : : Use Type "L" refrigerant grade copper tubing
only.
I I m m p p o o r r t t a a n n t t : : Failure to tighten bulb to suction line, can
result in erratic operation of unit.
N N O O T T I I C C E E
C C o o m m p p r r e e s s s s o o r r D D a a m m a a g g e e ! !
P P O O E E o o i i l l i i s s h h y y g g r r o o s s c c o o p p i i c c – – i i t t a a b b s s o o r r b b s s w w a a t t e e r r d d i i r r e e c c t t l l y y
f f r r o o m m t t h h e e a a i i r r . . T T h h i i s s w w a a t t e e r r i i s s n n e e a a r r l l y y i i m m p p o o s s s s i i b b l l e e t t o o
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 . .
and
"System
in Maintenance section)
33
Advertisement
Table of Contents
