Trane RTAA-130 Installation, Operation And Maintenance Manual Download

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RTAA-IOM-3

2. The display will flash the Current

Operating Code “A”, followed by a
fully blank display for all other
diagnostics (CMR, CAR, and IFW
diagnostics). This is to call attention
to the detection of some type of
failure.

Depressing the Display Down key will
advance the display to the “Last (most
recent) Diagnostic Code”. The display
will “flash” if any diagnostic exists that
requires a manual reset to restore full
unit operation. The display will be
continuous if no manual reset is
required to restore full operation. The
“Last Diagnostic Code” will be retained
until the unit control is reset or a new
diagnostic occurs.

Depressing the Display Down key will
then cause the display to show any
“Other Diagnostic Codes” that have
occurred since the “Other Diagnostic
Codes” was last reset. Any specific
diagnostic will not be shown more than
once, even if it has occurred more than
once. No time sequence of occurrence
is provided. The display will “flash” if
the current logical status of the
condition that caused the diagnostic
still exists or if it is an MMR or MAR
diagnostic. Flashing means the
condition still exists if it is a MAR, CAR,
or IFW diagnostic or that a manual
reset is required if it is a MMR or CMR
diagnostic.

By depressing the Display Down key
after the last of the “Other Diagnostic
Codes”, the display can be advanced to
setpoint adjustment, unit temperature,
and other data displays.

Depressing the Display Down key
following the last data display in the
menu (either operating, service,
auxiliary options, or factory) will return
the display to the top of the display
menu, “P Menu Number”. If the menu
selected is Menu 0 and either an MMR
and MAR diagnostic is still active, when
selected again, the operating code will
“alternate” with the highest priority
MMR or MAR, as in item 1. above.
Otherwise, in all other cases, the
current operating code will be
displayed continuously.

If any diagnostics have been detected
since the last unit reset, the “Last
Diagnostic Code” will be cleared when
the chiller switch is moved from the
STOP/ RESET position to either of the
AUTO positions. The display will show
“A 88” for 0.5 to 5 sec. following the
reset, before returning to the display of
the operating code.

The above step will not clear the
“Other Diagnostic Codes” menu item.
To clear this, depress and hold the
Display Down key while moving the
chiller switch from the STOP/RESET
position to either of the AUTO
positions.

Mechanical Control Settings

The settings for the High Pressure
switch, Oil Pressure switch, and
Winding Thermostat are shown below:

OPEN

Compressor

300 ±20

405 ±7

Discharge
High Pressure
Switch - PSIG

Compressor Oil

50 ±3

Pressure Switch
-PSID

Compressor

181

221

Motor Winding
Thermostat - F

Domestic Water

115

130

Heater Solenoid
Thermostat - F

Diagnostics and
Troubleshooting

If no diagnostics exist, the selected
menu item will be displayed
continuously. When a diagnostic
occurs, the display will switch to the
Menu “0” and, depending on the
nature of the diagnostic, will do one of
the following:

1. The display will “alternate” between

the Operating Code “A” at the time
of failure and the Diagnostic Code
“C” for any condition that causes the
entire shutdown (MMR and MAR
diagnostics). The display will
alternate between “A XX” and “C
YY”, where YY is the MMR or MAR
diagnostic that caused the machine
to shutdown. If multiple MMR or
MAR diagnostics occur, YY will be
the active diagnostic with the
greatest priority. Priority, from the
highest to lowest, shall be as follows:

Contactor - Cprsr D (MMR)

Contactor - Cprsr C (MMR)

Contactor - Cprsr B (MMR)

Contactor - Cprsr A (MMR)

413

CPM module indicates EXV

module communications loss (MMR)

431

EXV Module indicates CPM

module communications loss (MMR)

Emergency Stop (MMR)

Evaporator Leaving Water
Temperature Sensor (MMR)

Evaporator Entering Water
Temperature Sensor (MMR)

Chilled Water Flow (Entering
Water Temperature) (MMR)

Under Voltage (MAR)

Over Voltage (MAR)

Chilled Water Flow Interlock
(MAR)

Low Chilled Water Temp.
(Unit On) (MAR)

When multiple diagnostics exist and a
diagnostic with a higher priority is no
longer active, the diagnostic with lower
priority will replace it in the alternating
“A XX” and “C YY” displays.

Note:

MMR diagnostics only become

inactive after a RESET MAR diagnostics
become inactive when the condition
that caused them clears.