Trane RAUJ-C20, Installation, Operation And Maintenance Manual

Page: 53 / 132

SS-SVX11K-EN 53
Figure 37. Pressure gauges 20 - 60 Ton units: front
view
Discharge
Connection
Suction
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 NO OT TIIC CE E
E Eq qu uiip pm me en ntt D Da am ma ag ge e!!
D Drriilllliin ng g o orr ssa aw wiin ng g p piip pe e ssttu ub bss cco ou ulld d iin nttrro od du ucce e
cco op pp pe err cch hiip pss iin ntto o tth he e ssy ysstte em m a an nd d cca au usse e e eq qu uiip pm me en ntt
d da am ma ag ge e..
D Do o n no ott d drriillll a a h ho olle e iin n tth he e sse ea all cca ap pss o orr ssa aw w tth he e e en nd dss
o off p piip pe e ssttu ub bss..
Brazing Procedures
W WA AR RN NIIN NG G
E Ex xp pllo ossiio on n H Ha azza arrd d a an nd d D De ea ad dlly y G Ga asse ess!!
F Fa aiillu urre e tto o ffo ollllo ow w a allll p prro op pe err ssa affe e rre effrriig ge erra an ntt
h ha an nd dlliin ng g p prra accttiicce ess cco ou ulld d rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss
iin njju urry y..
N Ne ev ve err sso olld de err,, b brra azze e o orr w we elld d o on n rre effrriig ge erra an ntt lliin ne ess o orr
a an ny y u un niitt cco om mp po on ne en nttss tth ha att a arre e a ab bo ov ve e a attm mo ossp ph he erriicc
p prre essssu urre e o orr w wh he erre e rre effrriig ge erra an ntt m ma ay y b be e p prre esse en ntt..
A Allw wa ay yss rre em mo ov ve e rre effrriig ge erra an ntt b by y ffo ollllo ow wiin ng g tth he e
g gu uiid de elliin ne ess e esstta ab blliissh he ed d b by y tth he e E EP PA A F Fe ed de erra all C Clle ea an n
A Aiirr A Acctt o orr o otth he err sstta atte e o orr llo occa all cco od de ess a ass a ap pp prro op prriia atte e..
A Afftte err rre effrriig ge erra an ntt rre em mo ov va all,, u usse e d drry y n niittrro og ge en n tto o
b brriin ng g ssy ysstte em m b ba acckk tto o a attm mo ossp ph he erriicc p prre essssu urre e b be effo orre e
o op pe en niin ng g ssy ysstte em m ffo orr rre ep pa aiirrss.. M Miix xttu urre ess o off
rre effrriig ge erra an nttss a an nd d a aiirr u un nd de err p prre essssu urre e m ma ay y b be ecco om me e
cco om mb bu ussttiib blle e iin n tth he e p prre esse en ncce e o off a an n iig gn niittiio on n sso ou urrcce e
lle ea ad diin ng g tto o a an n e ex xp pllo ossiio on n.. E Ex xcce essssiiv ve e h he ea att ffrro om m
sso olld de erriin ng g,, b brra azziin ng g o orr w we elld diin ng g w wiitth h rre effrriig ge erra an ntt
v va ap po orrss p prre esse en ntt cca an n ffo orrm m h hiig gh hlly y tto ox xiicc g ga asse ess a an nd d
e ex xttrre em me elly y cco orrrro ossiiv ve e a acciid dss..
W WA AR RN NIIN NG G
E Ex xp pllo ossiio on n H Ha azza arrd d!!
F Fa aiillu urre e tto o ffo ollllo ow w tth he esse e iin nssttrru uccttiio on nss cco ou ulld d rre essu ulltt iin n
d de ea atth h o orr sse erriio ou uss iin njju urry y o orr e eq qu uiip pm me en ntt o orr p prro op pe errtty y--
o on nlly y d da am ma ag ge e..
U Usse e o on nlly y d drry y n niittrro og ge en n w wiitth h a a p prre essssu urre e rre eg gu ulla atto orr ffo orr
p prre essssu urriizziin ng g u un niitt.. D Do o n no ott u usse e a acce etty ylle en ne e,, o ox xy yg ge en n o orr
cco om mp prre esssse ed d a aiirr o orr m miix xttu urre ess cco on ntta aiin niin ng g tth he em m ffo orr
p prre essssu urre e tte essttiin ng g.. D Do o n no ott u usse e m miix xttu urre ess o off a a
h hy yd drro og ge en n cco on ntta aiin niin ng g rre effrriig ge erra an ntt a an nd d a aiirr a ab bo ov ve e
a attm mo ossp ph he erriicc p prre essssu urre e ffo orr p prre essssu urre e tte essttiin ng g a ass tth he ey y
m ma ay y b be ecco om me e fflla am mm ma ab blle e a an nd d cco ou ulld d rre essu ulltt iin n a an n
e ex xp pllo ossiio on n.. R Re effrriig ge erra an ntt,, w wh he en n u usse ed d a ass a a ttrra acce e g ga ass
ssh ho ou ulld d o on nlly y b be e m miix xe ed d w wiitth h d drry y n niittrro og ge en n ffo orr
p prre essssu urriizziin ng g u un niittss..
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
IIn nsstta alllla attiio on n M Me ecch ha an niicca all