Trane Rtaaiom3 Manual

							131RTAA-IOM-3
Periodic
Maintenance
General
Perform all maintenance procedures
and inspections at the recommended
intervals. This will prolong the life of
the equipment and minimize the
possibility of costly failures.
Use an “Operator’s Log”, such as that
shown in Figure 58, to record an
operating history for the unit. The log
serves as a valuable diagnostic tool for
service personnel. By observing trends
in operating conditions, an operator
can anticipate and prevent problem
situations before they occur.
If the unit does not operate properly
during maintenance inspections, refer
to “Diagnostics and Troubleshooting”. 
						

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Figure 58
Operator’s Log 
						

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Refrigerant Emission
Control
Evidence from environmental scientists
indicates that the ozone in our upper
atmosphere is being reduced, due to
the release of CFC fully halogenated
compounds.
The Trane Company encourages every
effort to eliminate, if possible, or
vigorously reduce the emission of CFC,
HCFC and HFC refrigerants into the
atmosphere that result from
installation, operation, routine
maintenance, or major services on this
equipment. Always act in a responsible
manner to conserve refrigerants  for
continued use, even when acceptable
alternatives are available.
Conservation and emission reduction
can be accomplished by following
recommended Trane operation,
maintenance and service procedures,
with specific attention to the following:
1. Refrigerant used in any type of air
conditioning or refrigerating
equipment should be recovered for
reuse, recovered and/or recycled for
reuse, reprocessed (reclaimed), or
properly destroyed, whenever it is
removed from equipment. Never
release refrigerant into the
atmosphere.
2. Always determine possible recycle or
reclaim requirements of the
recovered refrigerant before
beginning recovery by any method.
Questions about recovered
refrigerants and acceptable
refrigerant quality standards are
addressed in ARI Standard 700.
3. Use approved containment vessels
and safety standards. Comply with
all applicable transportation
standards when shipping refrigerant
containers.
4. To minimize emissions while
recovering refrigerant, use recycling
equipment. Always attempt to use
methods which will pull the lowest
possible vacuum while recovering
and condensing refrigerant into
containment.
5. When leak checking with trace
refrigerant and nitrogen, use HCFC-
22 (R-22), rather than CFC-12 (R-12)
or any other fully halogenated
refrigerants. Be aware of any new
leak test methods which eliminate
refrigerant as a trace gas.6. When cleaning system components
or parts, avoid using CFC-11 (R-11) or
CFC-113 (R-113). Refrigeration
system
cleanup methods which use filters and
dryers are preferred. Do not use
solvents which have ozone depletion
factors. Properly dispose of used
materials.
7. Take extra care to properly maintain
all service equipment that directly
supports refrigeration service work,
such as gauges, hoses, vacuum
pumps and recycling equipment.
8. Stay aware of unit enhancements,
conversion refrigerants, compatible
parts and manufacturer’s
recommendations which will reduce
refrigerant emissions and increase
equipment operating efficiencies.
Follow manufacturer’s specific
guidelines for conversion of existing
systems.
9. In order to assist in reducing power
generation emissions, always
attempt to improve equipment
performance with improved
maintenance and operations that will
help conserve energy resources.
Weekly Maintenance
After the unit has been operating for
approximately 30 minutes and the
system has stabilized, check the
operating conditions and complete the
procedures below:
[  ] Check the evaporator refrigerant
pressure (23) and the condenser
refrigerant pressure (25) in Menu 2
on the UCM. The pressures are
referenced to sea level (114.6960
psia).
[  ] Check the liquid line sight glasses.
The refrigerant flow past the sight
glasses should be clear. Bubbles in
the refrigerant indicate either low
refrigerant charge or excessive
pressure drop in the liquid line. A
restriction in the line can sometimes
be identified by a noticeable
temperature differential between
the two sides of the restriction. Frost
may often form on the line at this
point. Proper refrigerant charges are
shown on Table 1.
Caution: A clear sight glass alone
does not mean that the system
properly charged. Also check
system superheat, subcooling, and
unit operating pressures. 
						

							134RTAA-IOM-3
[  ] If operating pressures and sight
glass conditions seem to indicate
refrigerant shortage, measure the
system superheat and system
subcooling. Refer to “System
Superheat” and “System
Subcooling”.
[  ] If operating conditions indicate a
refrigerant overcharge, remove
refrigerant at the liquid line service
valve. Allow refrigerant to escape
slowly, to minimize oil loss. Do not
discharge refrigerant into the
atmosphere.
WARNING: Do not allow
refrigerant to directly contact
skin or injury from frostbite may
result.
[  ] Inspect the entire system for
unusual conditions and inspect the
condenser coils for dirt and debris. If
the coils are dirty, refer to “Coil
Cleaning”.
Monthly Maintenance
[  ] Perform all weekly maintenance
procedures.
[  ] Measure and record the system
superheat. Refer to “System
Superheat”.
[  ] Measure and record the system
subcooling. Refer to “System
Subcooling”.
[  ] Manually rotate condenser fans to
insure proper clearance on the fan
openings.
WARNING: Position all electrical
disconnects in the “OPEN”
position and lock them, to
prevent injury or death due to
electrical shock.
Annual Maintenance
[  ] Perform all weekly and monthly
maintenance procedures.
[  ] Check the oil level and refrigerant
charge. Refer to “Maintenance
Procedures”.
[  ] Have a qualified laboratory perform
a compressor oil analysis to
determine system moisture content
and acid level. This analysis is a
valuable diagnostic tool.
[  ] Contact a qualified service
organization to leak test the chiller,
to check operating and safety
controls, and to inspect electrical
components for deficiencies.
[  ] Inspect all piping components for
leakage and damage. Clean out any
inline strainers.
[  ] Clean and repaint any areas that
show signs of corrosion.
[  ] Clean the condenser coils. Refer to
“Coil Cleaning”.
[  ] Clean the Domestic Water Heater.
Refer to Domestic Water Heater tube
cleaning procedure.
WARNING: Position all electrical
disconnects in the “OPEN”
position and lock them, to
prevent injury or death due to
electrical shock.
[  ] Clean the condenser fans. Check the
fan assemblies for proper clearance
in the fan openings and for motor
shaft misalignment, abnormal
endplay, vibration and noise.
WARNING: Position all electrical
disconnects in the “OPEN”
position and lock them, to
prevent injury or death due to
electrical shock. 
						

							135RTAA-IOM-3
Maintenance
General
This section describes specific
maintenance procedures which must
be performed as a part of the normal
maintenance program for this unit. Be
certain that electrical power to the unit
is disconnected before performing
these procedures.
WARNING: Position all electrical
disconnects in the “OPEN”
position and lock them, to
prevent injury or death due to
electrical shock.
Coil Cleaning
Clean the condenser coils at least once
each year, or more frequently if the unit
is located in a “dirty” environment.
This will maintain proper unit operating
efficiencies. Follow the detergent
manufacturer’s instructions as closely
as possible to avoid damage to the
coils.
To clean the coils, use a soft brush and
a sprayer, either the garden, pump-up
type or a high-pressure type. A high-
quality detergent, such as “Trane Coil
Cleaner, CHM-0002” is recommended
for both standard and “Blue-Fin” coils.
Note: If the detergent mixture is
strongly alkaline (pH value greater than
8.5), an inhibitor must be added.
Chemically Cleaning
The Evaporator
The chilled water system is a closed-
loop and therefore should not
accumulate scale or sludge. If the
chiller becomes fouled, first attempt to
dislodge the material by backflushing
the system. If unsuccessful after several
attempts, chemically clean the
evaporator.
Caution: Do not use an acid type
cleaning agent that will damage
steel, galvanized steel,
polypropylene, or internal copper
components.
With this information, water treatment
firms will be able to recommend a
suitable chemical for use in this
system.
A typical configuration for chemical
cleaning is shown in Figure 59. The
supplier of the cleaning chemicals must
provide or approve:
All of the materials used in this
configuration
The amount of chemicals used
The length of time the chemicals are
used
Any safety precautions and
handling instructions
Domestic Water
Heater – Tube Cleaning
The water tubes may be mechanically
cleaned with a wire brush. This can be
done by isolating the water supply to
the Domestic Water Heater, relieving
the water pressure, and removing the
access plugs at the rear of the unit.
Once the tubes have been brushed and
scale has been loosened, flush the
water tubes with fresh water, reinstall
the access plugs and return to service.
The circulator should be shut off during
this operation and all air must be bled
from the water circuit when returning
the unit to operation. Be certain to use
an approved pipe sealant on the
threaded access plugs when
reinstalling to prevent water leaks.
Figure 59
Chemical Cleaning Configuration 
						

							136RTAA-IOM-3
Water Treatment
The use of untreated or improperly
treated water in the unit may result in
the formation of scale, algae, or slime.
It may also cause erosion or corrosion.
It is recommended that a qualified
water treatment specialist provide
recommendations for proper water
treatment. The Trane Company
assumes no responsibility for
equipment failure caused by the use of
untreated or improperly treated water.
Oil Separator Level
Check
Follow the steps listed below and refer
to the notes listed in Figure 60.
1. Turn off the unit,
2. Attach the hoses and sight glass to
the oil separator charging Schrader
valve and the compressor discharge
line Schrader valve, as shown in
Figure 60. Purge to remove non-
condensibles. It is advisable to use Schrader
quickcoupler isolation valves at the
ends of the hoses. These will aid in
the installation and removal of the
hoses and minimize oil and
refrigerant spray.
3. After the unit has been off for 10
minutes, move the sight glass up
and down until the level can be seen.
4. After the level has been determined,
remove the sight glass and hoses.
Note: Routine changing of the oil or
the oil filter is not recommended. The
oil filter is oversized for this application
and should not require replacement.
The oil and filter should be replaced
only if analysis reveals that the oil is
contaminated. Oil type and system
capacities are shown in Table 1. 
						

							137RTAA-IOM-3
Figure 60
System Oil Level Specifications
Caution: Do not check oil level with
machine operating. Severe oil loss
will occur.
Caution: When checking oil level
wear protective clothing since oil
will spray when discharged.
Insure that the apex of the line above
the sight glass is as high as possible, to
eliminate liquid traps which can give
erroneous readings. 
						

							138RTAA-IOM-3 
						

							139RTAA-IOM-3 UNIT OPERATING  STATUS COMPRESSOR  OPERATING  STATUS
CODE DESCRIPTION CODE DESCRIPTION
Blank UCM Power Off 00Compressor Stop
888888.8 UCM Paw Up 16 Compressor  Lockout
00 Unit Stop 17 Cprsr Service Pumpdown
01 Auto-Local 70 Cprsr Restart Inhibit
02 Auto-Remote 72 Cprsr Start
17 Service Pumpdown 74 Run Normal
70 Unit Restart Inhibit 75 Run:Current Limit
72 Unit Start 76 Run: Condenser Limit
74 Run:Normal 1 77 Run:Evaporator Limit
75 Run :Current Limit 7E Run:Unload
78 Run ;Condenser Limit
77 Run:Evaporator Limit
7E Run:Unload
88 Reset
DIAGNOSTIC TYPES100 External Unit Stop
101 Ice Building Complete MMR Machine Shutdown-Manual Reset
118 EXV Test CMR Circuit Shutdown-Man Reset
174 Ice Building; Normal MAR Machine Shutdown-Auto Reset
175 Ice  Building: Current Limit CAR Circuit Shutdown-Auto Reset
176 Ice  Building: Condenser Limit IFW Informational-Warning
177 Ice Building: Evaporator Limit
200 Low Ambient Run Inhibit
UNIT DIAGNOSTICS CONDITIONFLASHING DISPLAY: MEANS:
A xxx A New CMR, CAR. or IFW Diagnostic Exists.
A xxx « C yyy Operating Code when MMR or MAR occurred. Diagnostic currently inhibiting operation.
b yyy Manual reset required to restore full operation. This or other latching diagnostics exist.
C yyy Condition creating MAR, CAR or IFW still exists. If MMR or CMR, manual reset required.
10 uu The chilled water setpoint is too close to a cutout setpoint.
DASHES: MEANS:
d ---- The chiller is in either Ice bldg or ice bldg compl: Ivg chld wtr stpt is not applicable.
33 ---- The chiller is in normal cooling; the active ice termination setpoint is not applicable.
Other (e.g. 14----) Option either not installed or not enabled.
CODE DESCRIPTION TYPE CODE DESCRIPTION TYPE
87 Chock External Chilled Water Stpt IFW 19F Phase Loss - Cprsr D CMR
89 Check External Current Limit Stpt IFW 1AO Power Loss - Cprsr A CAR
8A Chilled Water Flow (Ent Wtr Temp) MMR 1A1 Power Loss - Cprsr 8 CAR
8E Evap Entering Water Temp Sensor MMR 1A2 Power Loss - Cprsr C CAR
8F Cond Rfgt Tamp Sensor - Ckt I CMR 1A3 Power Loss - Cprsr D CAR
90 Cond Rfgt Temp Sensor - Ckt 2 CMR 1A4 Remote communications Loss IFW
93 Evap Rfgt Temp Sensor - Ckt I CMR 1A5 Oil Flow Control - Cprsr A CMR
94 Evap Rfgt Tamp Sensor - Ckt 2 CMR 1A6 Oil Flow Control - Cprsr B CMR
A0 Zone Temp Sensor IFW 1A7 Oil Flow Control - Cprsr C CMR
A1 Outdoor Air Temp Sensor IFW 1A8 Oil Flow Control - Cprsr D CMR
Ab Evap Leaving Wtr Temp Sensor MMR 1A9 EXV Elec Drive Ckt - Rfgt Ckt I CMR
bA Overload Trip - Cprsr A CMR 1AA EXV Elec Drive Ckt - Rfgt Ckt 2 CMR
bb Overload Trip - Cprsr 0 CMR 1Ad Memory Error Type I (See Oper Manual) IFW
bC Overload Trip - Cprsr C CMR 1AE Low Differential Press - Ckt I CMR
bd Overload Trip - Cprsr D CMR 1AF Low Differential Press - Ckt 2 CMR
bE High Pressure Cutout - Cprsr C CMR 1b2 Severe Phase Unbalance - Cprsr A CMR
bF High Pressure Cutout - Cprsr D CMR 1b3 Severe Phase Unbalance - Cprsr B CMR
C5 Low Chilled Water Temp ( U n I t off) IFW 1b4 Severe Phase Unbalance - Cprsr C CMR
C6 Low Chilled Water Temp (Unit on) MAR 1b5 Severs Phase Unbalance - Cprsr 0 CMR
CA Contactor - Cprsr A MMR 1b6 Compressor Overload Setting - Cprsr A IFW
Cb Contactor - Cprsr B MMIR 1b7 Compressor Over load Setting - Cprsr B IFW
cc Contactor - Cprsr C MMR 1b8 Compressor Overload  Setting - Cprsr C IFW
Cd Contactor - Cprsr D MMR 1b9 Compressor Overload  Setting - Cprsr D IFW
d7 Over Voltage MAR 1bA Phase Unbalance - Cprsr  A CMR
d8 Under Voltage MAR 1bb Phase Unbalance - Cprsr  8 CMR
Ed Chilled Water Flow Interlock MAR 1bC Phase Unbalance - Cprsr  C CMR
F5 High Pressure Cutout - Cprsr A CMR 1bd Phase Unbalance - Cprsr  D CMR
F6 High Pressure Cutout - Cprsr B CMR 1bE Winding Temp. - Cprsr A CMR
Fd Emergency Stop Input MMR 1bF Winding Temp. - Cprsr B CMR
180 Starter Transition - Cprsr A CMR 1C0 Winding Temp. - Cprsr C CMR
181 Starter Transition - Cprsr B CMR 1C1 Winding Temp. - Cprsr D CMR
182 Starter Transition - Cprsr C CMR 1C2 Discharge Temp. - Cprsr  A CMR
183 Starter Transition - Cprsr D CMR 1C3 Discharge Temp. - Cprsr  8 CMR
184 Phase Reversal - Cprsr A CMR 1C4 Discharge Temp. - Cprsr  C CMR
185 Phase Reversal - Cprsr 8 CMR 1C5 Discharge Temp. - Cprsr  D CMR
186 Phase Reversal - Cprsr C CMR 1C6 High Differential Pressure - Ckt I CMR
187 Phase Reversal - Cprsr D CMR 1C7 High Differential Pressure - Ckt 2 CMR
190 Low Superheat - Ckt I CMR 1d1 Memory Error Type II (See Oper Manual) IFW
191 Low Superheat - Ckt 2 CMR 1d2 Memory Error Type III (See Oper Manual) IFW
194 Low Evap Rfgt Tamp - Ckt I CMR 1d3 Cprsr Suction Temp. Sensor - Ckt 1 CMR
195 Low Evap Rfgt Temp - Ckt 2 CMR 1d4 Cprsr Suction Temp. Sensor - Ckt 2 CMR
198 Low Oil I Flow - Cprsr A CMR 1d7 Phase Reversal Prot. Lost - Cprsr A CMR
199 Low 01 1 Flow - Cprsr B CMR 1d8 Phase Reversal Prot. Lost - Cprsr B CMR
19A Low Oil Flow - Cprsr C CMR 1d9 Phase Reversal Prot. Lost - Cprsr C CMR
19b Low Oil Flow - Cprsr D CMR 1dA Phase Reversal Prot. Lost - Cprsr D CMR
19C  Phase Loss - Cprsr A CMR 1db Slave-Exv Elec Drive Ckt - Rfgt Ckt 1 CMR
19d Phase Lose - Cprsr B CMR  1dc Slave-Exv Elec Drive Ckt - Rfgt Ckt 2 CMR
19E Phase Loss - Cprsr C CMR  4xy See Operator’s Manual – – –
X3956048201 Rev. B
Condition Codes 
						

							For further information on this product or other Trane products, refer to the “Trane Service Literature
Catalog,” ordering number IDX-IOM-1. This catalog contains listings and prices for all service literature
sold by Trane. The catalog may be ordered by sending a $15.00 check to:
The Trane Company, Service Literature Sales, 3600 Pammel Creek Road, La Crosse, WI 54601.
To help ensure optimum performance, be sure to specify quality Trane parts.
Printed by Production Services – La Crosse
RTAA-IOM-3