Ingersoll-Rand Trane Ascend ACS, Installation, Operation And Maintenance Manual

Page: 70 / 88

70 AC-SVX002C-EN
Cleaning Air Side of Coils
N NO OT TIIC CE E
C Co oiill D Da am ma ag ge e!!
U Usse e o off cco oiill cclle ea an niin ng g a ag ge en nttss o on n u un ncco oa atte ed d cco oiillss
cco ou ulld d cca au usse e d da am ma ag ge e tto o cco oiillss..
D Do o n no ott u usse e cco oiill cclle ea an niin ng g a ag ge en nttss tto o u un ncco oa atte ed d cclle ea an n
cco oiillss.. U Usse e cclle ea an n w wa atte err o on nlly y..
Do not use detergents to clean the air side of coils. Use
clean water only. Clean from inside out by removing
end panels.
Cleaning Coated Coils
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss C Ch he em miicca allss!!
C Co oiill cclle ea an niin ng g a ag ge en nttss cca an n b be e e eiitth he err a acciid diicc o orr h hiig gh hlly y
a allkka alliin ne e a an nd d cca an n b bu urrn n sse ev ve erre elly y iiff cco on ntta acctt w wiitth h sskkiin n
o orr e ey ye ess o occccu urrss..
H Ha an nd dlle e cch he em miicca all cca arre effu ulllly y a an nd d a av vo oiid d cco on ntta acctt w wiitth h
sskkiin n.. A AL LW WA AY YS S w we ea arr P Pe errsso on na all P Prro otte eccttiiv ve e
E Eq qu uiip pm me en ntt ((P PP PE E)) iin nccllu ud diin ng g g go og gg glle ess o orr ffa acce e ssh hiie elld d,,
cch he em miicca all rre essiisstta an ntt g gllo ov ve ess,, b bo oo ottss,, a ap prro on n o orr ssu uiitt a ass
rre eq qu uiirre ed d.. F Fo orr p pe errsso on na all ssa affe etty y rre effe err tto o tth he e cclle ea an niin ng g
a ag ge en ntt m ma an nu uffa accttu urre err’’ss M Ma atte erriia allss S Sa affe etty y D Da atta a S Sh he ee ett
a an nd d ffo ollllo ow w a allll rre ecco om mm me en nd de ed d ssa affe e h ha an nd dlliin ng g
p prra accttiicce ess..
Coated coils may be cleaned using traditional
detergents.
Repair/Replacement of Microchannel
Coil
Microchannel coils are considerably more robust in
design than tube and fin condenser coils, however they
are not indestructible. When damage or a leak occurs,
contact your local Trane office.
Condenser Coil Corrosion Protection
Inspection
Perform coil inspection each time coils are cleaned.
Inspect corrosion protection at each coil refrigerant
connection where the copper tube joins the aluminum
manifold. If damaged or missing, wrap new Prestite
Insulated tar tape (STR01506) on joint to cover area
from the aluminum header body to at least 2 inches of
the copper tube. Seal insulation using hand pressure.
Rubber gloves are suggested when handling
insulation.
N No otte e:: Prestite insulated tar tape is required for all units
at each copper/aluminum connection. This
requirement is NOT associated with the coated
coil option.
Evaporator Maintenance
This chiller uses a brazed plate heat exchanger (BPHE)
evaporator with factory-installed electronic flow switch
(IFM efector) that is positioned in the evaporator water
pipe. The evaporator inlet also includes a factory-
installed immersion heater for freeze protection and a
water strainer that must be kept in place to keep debris
out of the evaporator.
N No otte e:: Strainer maintenance is critical to proper
operation and reliability. Any particles larger
than 1mm entering the BPHE evaporator may
cause the evaporator to fail, requiring
replacement.
Acceptable BPHE evaporator water flow rate is 1.2 to
3.6 gpm/ton. To maintain 54-44°F in/ out chilled water
temperatures, the nominal water flow rate is 2.4 GPM/
ton.
Minimum water flow rate must be maintained to avoid
laminar flow, potential evaporator freezing, scaling and
poor temperature control. The microprocessor and
capacity control algorithms are designed to take a 10
percent change in water flow rate per minute while
maintaining a ±2°F (1.1°C) leaving water temperature
control accuracy. The chiller tolerates up to 30 percent
per minute water flow variation as long as the flow is
equal to or greater than minimum flow requirements.
Maximum water flow is 18 feet per second. Flow rates
greater than this will cause excessive erosion.
The BPHE evaporator is difficult to clean should it
become plugged with debris. Indications of a plugged
BPHE evaporator include "wet" suction due to lack of
heat exchange, loss of superheat control, depressed
discharge superheat, compressor oil dilution and/or
starvation and premature compressor failure.
Water Strainer Maintenance
Units without Pump Package
An in-line strainer with a V-shaped sieve is used for
units that do not have factory-installed pump package
option.
Figure 50. In-line strainer, units without pump
package
WATER FLOW
DIRECTION
The strainer is equipped with a blow-down port. The
strainer is a 16 mesh (approximately 1 mm) material.
For maximum efficiency, 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. The taps
M Ma aiin ntte en na an ncce e