Trane Arctic PolyTherm TM Series, Installation, Operation And Maintenance Manual

Page: 61 / 84

ARTC-SVX005B-EN 61
3. Energize each compressor and check refrigerant
pressures, signs of overheating, and oil leaks.
Check chiller/heater for leaks with a halogen leak
detector. Inspect packing nuts on rotalock valves (if
so equipped), threaded connections of rotalock
valves, flared fittings on refrigeration gauge and
pressure switches, and access ports on Schrader
valves.
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..
4. De-energize each compressor and inspect terminals
for pitting, corrosion, and loose connections.
5. Inspect that the oil level is visible in each
compressor and not discolored. Annual oil samples
should be taken to be analyzed for destructive
acids, corrosive materials, or metal deposits.
6. Inspect and record the compressor amperage
draws and voltage.
7. Record water/glycol mixture flow to ensure it meets
design specifications.
8. Tighten rotalock nuts at the compressors. The
recommended torque is 80 lbf for 2 inch and larger
and 60 lbf for rotalock nuts smaller than 2 inch.
9. Inspect all control capillary tubing to ensure that the
lines are separated and not vibrating against one
another or the frame or housing.
10. Ensure all refrigeration lines are properly supported
to prevent vibration from causing premature failure
of copper piping.
11. Inspect all insulation on piping and control sensors.
Repair and replace as necessary.
12. Inspect entire plumbing system for leaks.
13. Review logged alarms and look for repetitive
trends. The chiller/heater can retain the previous
1,000 alarms with time and date of occurrence.
14. If equipped, inspect crankcase heaters to verify
proper operation.
15. Sample refrigerant to analyze for moisture or acid.
16. Inspect operating pressures and temperatures and
ensure the chiller has a full refrigerant charge.
Maintenance Tasks
The maintenance tasks described herein present the
basic, minimal, steps required to successfully complete
a task. Local policies and protocols may require more
elaborate procedures with additional checks and
inspections.
Freely substitute in those cases where local procedures
are more elaborate and complete than the procedures
listed in this manual.
Compressors, filter-strainers, and liquid line shutoff
valves are accessible on each side or end of the unit.
Inspection Methods
Appropriate inspection for modern chillers can be
described as “hands on.” Where possible and
appropriate, visual inspection should include touching
the component or apparatus being inspection. The
sense of touch provides additional feedback regarding
temperature, texture, tightness, and dryness that “eyes
only” inspection cannot match. Habitually touching
each item to be inspected also ensures that items are
not subconsciously skipped during the inspection
process. For a summary of tasks, see , Recommended
Chiller/heater Service Intervals.
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss V Vo olltta ag ge e!!
F Fa aiillu urre e tto o d diisscco on nn ne ecctt p po ow we err b be effo orre e sse errv viicciin ng g cco ou ulld d
rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss iin njju urry y..
D Diisscco on nn ne ecctt a allll e elle eccttrriicc p po ow we err,, iin nccllu ud diin ng g rre em mo otte e
d diisscco on nn ne eccttss b be effo orre e sse errv viicciin ng g.. F Fo ollllo ow w p prro op pe err
llo occkko ou utt//tta ag go ou utt p prro occe ed du urre ess tto o e en nssu urre e tth he e p po ow we err
cca an n n no ott b be e iin na ad dv ve errtte en nttlly y e en ne errg giizze ed d.. V Ve erriiffy y tth ha att n no o
p po ow we err iiss p prre esse en ntt w wiitth h a a v vo ollttm me ette err..
Critical Cleaning Tasks
Monitor temperature change and pressure drops
across the evaporator and condenser circuit to
determine the frequency for strainer cleaning. Monitor
water quality in the chiller/heater’s closed system to
determine the optimum frequency for evaporator
cleaning.
Temperature change and pressure drop across the
evaporator circuit should be monitored to determine
the frequency needed for strainer cleaning. On multiple
module chiller/heaters, Trane provides service isolation
valves on each evaporator to isolate each strainer for
cleaning without disrupting the operation of any
remaining modules in the chiller.
Strainer Cleaning Procedure
Strainers at each evaporator are critical for protecting
the brazed plate heat exchanger’s small water
passages as well as maintaining water/glycol mixture
cleanliness. Service valves on the evaporator isolate
each strainer for cleaning without interrupting the
operation of other modules in the chiller bank. If a tank
and pump module is provided, pot strainers are
occasionally included on the pumps’ suction lines.
M Ma aiin ntte en na an ncce e P Prro occe ed du urre ess