Trane Voyager RT-SVX17C-EN Installation Operation & Maintenance Download Page 66

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System Troubleshooting (Continued)

Economizer Actuator (ECA) Test Procedures

Verify Economizer Status by Economizer Actuator (ECA)

LED indicator:
OFF:

No Power or Failure

ON:

Normal, OK to Economize

Slow Flash:

Normal, Not OK to Economize

Fast Flash:

½ Second ON/2 Seconds OFF:
Error Code:
Communications Failure

Pulse Flash

2 Seconds On/½ Second Off:
Error Code:

1 Flash:

Actuator Fault

2 Flashes:

Sensor

3 Flashes:

RA Humidity Sensor out of range

4 Flashes

RA Temp Sensor out of range

6 Flashes

OA Humidity Sensor

7 Flashes

ECA not communicating with RTRM

8 Flashes

MA Temp Sensor

9-11 Flashes

Internal ECA failure

Method 2

Testing the LED with an analog Ohmmeter. Connect Ohm-
meter across LED in one direction, then reverse the leads
for the opposite direction. The LED should have at least 100
times more resistance in reverse direction, as compared
with the forward direction. If high resistance in both direc-
tions, LED is open. If low in both directions, LED is shorted.

Method 3

To test LED's with ZSM connected to the unit, test voltages
at LED terminals on ZSM. A measurement of 32 VDC,
across an unlit LED, means the LED has failed.

Note: Measurements should be made from LED
common (ZSM terminal 6 to respective LED
terminal). Refer to the Zone Sensor Module (ZSM)
Terminal Identification table at the beginning of this
section.

Programmable & Digital Zone Sensor Test

Testing serial communication voltage

1. Verify 24 VAC is present between terminals RTRM J6-14

and RTRM J6-11.

2. Disconnect wires from RTRM J6-11 and RTRM J6-12.

Measure the voltage between RTRM J6-11 and RTRM
J6-12; it should be approximately 32 VDC.

3. Reconnect wires to terminals RTRM J6-11 and RTRM

J6-12. Measure voltage again between RTRM J6-11 and
RTRM J6-12, voltage should flash high and low every
0.5 seconds. The voltage on the low end will measure
about 19 VDC, while the voltage on the high end will
measure from approximately 24 to 38 VDC.

4. Verify all modes of operation, by running the unit through

all of the steps in the “Test Modes" section discussed in
"Unit Start-Up".

5. After verifying proper unit operation, exit the test mode.

Turn the fan on continuously at the ZSM, by pressing the
button with the fan symbol. If the fan comes on and runs
continuously, the ZSM is good. If you are not able to turn
the fan on, the ZSM is defective.

Rooftop Refrigerator Module (RTRM)
Default Chart

CV Units

If the RTRM loses input from the building management sys-
tem, the RTRM will control in the default mode after approxi-
mately 15 minutes. If the RTRM loses the Heating and Cool-
ing Setpoint input from the potentiometers, the RTRM will
control in the default mode instantaneously. The tempera-
ture sensing thermistor in the Zone Sensor Module for CV
applications is the only component required for the "Default
Mode" to operate.

VAV Units

If the RTRM loses input from the building management sys-
tem, the RTRM will control in the default mode after approxi-
mately 15 minutes. For VAV units, a "shorted" mode input is
the only input required for the "Default Mode" to operate. If
the RTRM loses setpoint inputs from the RTAM due to re-
mote setpoint input failure, the RTRM will use default
setpoint inputs as defined in the default chart for VAV units.

Constant Volume Defaults

Component or Function

Default Operation

Cooling Setpoint (CSP)

74° F

Heating Setpoint (HSP)

71° F

Economizer Normal

Operation

Economizer Minimum

Normal Operation

Position