SSP-SVX001B-EN
21
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
No
otte
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
NO
OT
TIIC
CE
E
O
Op
pe
erra
attiin
ng
g U
Un
nd
de
err V
Va
accu
uu
um
m!!
F
Fa
aiillu
urre
e tto
o ffo
ollllo
ow
w tth
he
esse
e iin
nssttrru
uccttiio
on
nss w
wiillll rre
essu
ulltt iin
n
cco
om
mp
prre
esssso
orr ffa
aiillu
urre
e..
D
Do
o n
no
ott o
op
pe
erra
atte
e o
orr a
ap
pp
plly
y p
po
ow
we
err tto
o tth
he
e cco
om
mp
prre
esssso
orr
w
wh
hiille
e u
un
nd
de
err a
a v
va
accu
uu
um
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
NO
OT
TIIC
CE
E
E
Eq
qu
uiip
pm
me
en
ntt D
Da
am
ma
ag
ge
e!!
C
Ch
ha
arrg
ge
e w
wiitth
h a
acccce
essss p
po
orrtt o
on
n tth
he
e lliiq
qu
uiid
d lliin
ne
e o
on
nlly
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.
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.
IIm
mp
po
orrtta
an
ntt::
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
NO
OT
TIIC
CE
E
E
Eq
qu
uiip
pm
me
en
ntt D
Da
am
ma
ag
ge
e!!
T
Th
hiiss iiss P
PO
OE
E o
oiill,, w
wh
hiicch
h rre
ea
ad
diilly
y a
ab
bsso
orrb
bss m
mo
oiissttu
urre
e..
A
Allw
wa
ay
yss u
usse
e n
ne
ew
w o
oiill a
an
nd
d n
ne
ev
ve
err lle
ea
av
ve
e cco
on
ntta
aiin
ne
errss
o
op
pe
en
n tto
o a
attm
mo
ossp
ph
he
erre
e w
wh
hiille
e n
no
ott iin
n u
usse
e..
Table 4. R-410A TWA approved oils
Unit Model Number
Approved Oils
TWA060, TWA072,
TWA0764DA, TWA0764DD,
TWA0904*A, TWA0904*D,
TWA1014DD, TWA1204*D,
TWA156, TWA180, TWA201,
TWA240
Trane Oil Part Number OIL00094
(1 quart container)
TWA1014DA, TWA1204*A
Trane Oil Part Number OIL00079
(1 quart container) or OIL00080
(1 gallon container)
Table 5. R-22 TWA approved oils
Unit Model Number
Approved Oils
TWA0902*A, TWA1202*A,
TWA1802*B, TWA2402*B
Trane Oil Part Number OIL00094
(1 quart container)
For units equipped with compressors containing site
glasses, the oil level must be visible through the sight
glass when the compressor is running under stabilized
conditions and a few minutes after the compressor has
stopped.
