Trane TWA0724-A Series, Installation, Operation And Maintenance Manual

Page: 19 / 40

SSP-SVX001D-EN 19
Refrigerant Piping Procedures
(Outdoor Units)
W WA AR RN NIIN NG G
R R--4 41 10 0A A R Re effrriig ge erra an ntt u un nd de err H Hiig gh he err
P Prre essssu urre e tth ha an n R R--2 22 2!!
F Fa aiillu urre e tto o u usse e p prro op pe err e eq qu uiip pm me en ntt o orr cco om mp po on ne en nttss a ass
d de essccrriib be ed d b be ello ow w,, cco ou ulld d rre essu ulltt iin n e eq qu uiip pm me en ntt ffa aiilliin ng g
a an nd d p po ossssiib blly y e ex xp pllo od diin ng g,, w wh hiicch h cco ou ulld d rre essu ulltt iin n
d de ea atth h,, sse erriio ou uss iin njju urry y,, o orr e eq qu uiip pm me en ntt d da am ma ag ge e..
T Th he e u un niittss d de essccrriib be ed d iin n tth hiiss m ma an nu ua all u usse e R R--4 41 10 0A A
rre effrriig ge erra an ntt w wh hiicch h o op pe erra atte ess a att h hiig gh he err p prre essssu urre ess
tth ha an n R R--2 22 2.. U Usse e O ON NL LY Y R R--4 41 10 0A A rra atte ed d sse errv viicce e
e eq qu uiip pm me en ntt o orr cco om mp po on ne en nttss w wiitth h tth he esse e u un niittss.. F Fo orr
ssp pe ecciiffiicc h ha an nd dlliin ng g cco on ncce errn nss w wiitth h R R--4 41 10 0A A,, p plle ea asse e
cco on ntta acctt y yo ou urr llo occa all T Trra an ne e rre ep prre esse en ntta attiiv ve e..
W WA AR RN NIIN NG G
R Re effrriig ge erra an ntt u un nd de err H Hiig gh h P Prre essssu urre e!!
F Fa aiillu urre e tto o ffo ollllo ow w iin nssttrru uccttiio on nss b be ello ow w cco ou ulld d rre essu ulltt iin n
a an n e ex xp pllo ossiio on n w wh hiicch h 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 d da am ma ag ge e..
S Sy ysstte em m cco on ntta aiin nss rre effrriig ge erra an ntt u un nd de err h hiig gh h p prre essssu urre e..
R Re ecco ov ve err rre effrriig ge erra an ntt tto o rre elliie ev ve e p prre essssu urre e b be effo orre e
o op pe en niin ng g tth he e ssy ysstte em m.. S Se ee e u un niitt n na am me ep plla atte e ffo orr
rre effrriig ge erra an ntt tty yp pe e.. D Do o n no ott u usse e n no on n--a ap pp prro ov ve ed d
rre effrriig ge erra an nttss,, rre effrriig ge erra an ntt ssu ub bssttiittu utte ess,, o orr rre effrriig ge erra an ntt
a ad dd diittiiv ve ess..
Each unit ships with a holding charge of dry nitrogen.
The nitrogen should be removed and the entire system
evacuated (at the proper time) to avoid possible
contamination.
1. Remove the compressor service access panel.
2. Locate the liquid and suction line access valves.
Check that the piping connection stubs ( Figure 12,
p. 19 ) line up properly with the holes in the unit
cabinet.
Figure 12. Outdoor units - refrigerant piping (with dry
nitrogen)
Gas Line Gauge Port
Manifold
Gauges
Liquid Line Gauge Port
3. Install gauges to determine if the circuits are still
pressurized. If not, the charge has escaped and
should be repaired as required to obtain a leak-free
circuit. If the circuits are still pressurized, use the
gauges to slowly release the nitrogen charge to the
atmosphere and remove both seal caps from the
outdoor unit connection stubs.
N NO OT TIIC CE E
S Sy ysstte em m C Co om mp po on ne en ntt D Da am ma ag ge e!!
D Do o n no ott rre em mo ov ve e tth he e sse ea all cca ap pss ffrro om m rre effrriig ge erra an ntt
cco on nn ne eccttiio on nss u un nttiill p prre ep pa arre ed d tto o b brra azze e rre effrriig ge erra an ntt
lliin ne ess tto o tth he e cco on nn ne eccttiio on nss.. E Ex xcce essssiiv ve e e ex xp po ossu urre e tto o
a attm mo ossp ph he erre e ((> > 5 5 m miin n..)) m ma ay y a allllo ow w m mo oiissttu urre e o orr d diirrtt
tto o cco on ntta am miin na atte e tth he e ssy ysstte em m,, d da am ma ag giin ng g v va allv ve e sse ea allss
a an nd d cca au ussiin ng g iicce e ffo orrm ma attiio on n iin n ssy ysstte em m cco om mp po on ne en nttss..
IIn nsstta alllla attiio on n