Trane RAUJ-C20, Installation, Operation And Maintenance Manual

Page: 120 / 132

120 SS-SVX11K-EN
Coil Cleaning
N NO OT TIIC CE E
D Da am ma ag giin ng g C Co oiill C Clle ea an ne errss!!
C Co oiill cclle ea an ne errss cca an n d da am ma ag ge e rro oo offss,, ssu urrrro ou un nd diin ng g
b bu uiilld diin ng gss,, v ve eh hiicclle ess,, e ettcc..
C Clle ea an niin ng g ssu ub bsstta an ncce ess ssh ho ou ulld d b be e cch he ecckke ed d tto o e en nssu urre e
tth ha att tth he ey y w wiillll n no ott cca au usse e d da am ma ag ge e tto o ssu urrrro ou un nd diin ng gss..
C Co oiillss a an nd d rro oo off ((iiff a ap pp plliicca ab blle e)) ssh ho ou ulld d b be e rriin nsse ed d
tth ho orro ou ug gh hlly y.. D Do o n no ott ssp prra ay y cco oiill cclle ea an ne errss iin n w wiin nd dy y
cco on nd diittiio on nss..
Regular coil maintenance, including annual cleaning,
enhances unit’s operating efficiency by minimizing:
• compressor head pressure and amperage draw;
• water carryover;
• fan brake horsepower; and,
• static pressure losses.
At least once each year—or more often if the unit is
located in a “dirty” environment—clean the
microchannel condenser using the instructions
outlined below. Be sure to follow these instructions as
closely as possible to avoid damaging the coils.
To clean refrigerant coils, use a soft brush and a
sprayer.
N No otte e:: DO NOT use any detergents with microchannel
condenser coils. Pressurized water or air ONLY.
1. Remove enough panels from the unit to gain safe
access to coils..
W WA AR RN NIIN NG G
N No o S Stte ep p S Su urrffa acce e!!
F Fa aiillu urre e tto o ffo ollllo ow w iin nssttrru uccttiio on n b be ello ow w 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 Do o n no ott w wa allkk o on n tth he e ssh he ee ett m me etta all d drra aiin n p pa an n.. W Wa allkkiin ng g
o on n tth he e d drra aiin n p pa an n cco ou ulld d cca au usse e tth he e ssu up pp po orrttiin ng g m me etta all
tto o cco olllla ap psse e a an nd d rre essu ulltt iin n tth he e o op pe erra atto orr//tte ecch hn niicciia an n
ffa alllliin ng g..
IIm mp po orrtta an ntt:: Bridging between the main supports
required before attempting to enter into
the unit. Bridging may consist of
multiple 2 by 12 boards or sheet metal
grating.
2. Straighten any bent coil fins with a fin comb.
3. For accessible areas, remove loose dirt and debris
from both sides of the coil. For dual row
microchannel condenser coil applications, seek
pressure coil wand extension through the local
Trane Parts Center.
N No otte e:: DO NOT use any detergents with
microchannel coils. Pressurized water or air
ONLY.
4. Pour the cleaning solution into the sprayer. If a
high-pressure sprayer is used:
a. The minimum nozzle spray angle is 15 degrees.
b. Do not allow sprayer pressure to exceed 600 psi.
c. Spray the solution perpendicular (at 90 degrees)
to the coil face.
5. Spray the leaving-airflow side of the coil first; then
spray the opposite side of the coil. For evaporator
and reheat coils, allow the cleaning solution to
stand on the coil for five minutes.
6. Rinse both sides of the coil with cool, clean water.
7. Inspect both sides of the coil; if it still appears to be
dirty, repeat Steps 6 and 7.
8. Reinstall all of the components and panels removed
in Step 1; then restore power to the unit.
9. For evaporator and reheat coils, use a fin comb to
straighten any coil fins which were inadvertently
bent during the cleaning process.
Microchannel Condenser Coil Repair and
Replacement
If microchannel condenser coil repair or replacement is
required, see Service Guide document RT-SVB83*-EN
for further details.
EVP Remote Evaporator Chiller
The brazed plate evaporator is difficult to clean should
it become plugged with debris so proper installation
and maintenance of the inlet water strainer is
important. Particles larger than 0.039” entering the
heat exchanger could block flow passages causing a
failure. Indications of a plugged BPHE evaporator
include “wet” suction due to lack of heat exchange,
loss of superheat control, depressed discharge
superheat (superheat less than 63°F), compressor oil
dilution and/or starvation and premature compressor
failure.
Minimum water flow rate must be maintained to avoid
laminar flow, potential evaporator freezing, scaling and
poor temperature control.
N NO OT TIIC CE E
H He ea att E Ex xcch ha an ng ge err D Da am ma ag ge e!!
F Frre ee ezziin ng g a an nd d h he ea att e ex xcch ha an ng ge err d da am ma ag ge e cco ou ulld d o occccu urr
iiff w wa atte err ffllo ow w iiss iin ntte errrru up ptte ed d..
D Do o n no ott sstto op p w wa atte err ffllo ow w w wiitth h tth he e rre effrriig ge erra attiio on n
ssy ysstte em m rru un nn niin ng g..
Maximum water flow rate must not be exceeded to
avoid possible erosion.
Water Strainer Maintenance
To protect the evaporator and for maximum efficiency,
the strainer must be cleaned. A differential pressure
gauge installed across the inlet and outlet will indicate
pressure loss due to clogging and may be used as a
guide to determine when cleaning is required.
M Ma aiin ntte en na an ncce e