Daikin Rebel DPS Series Installation And Maintenance Manual page 88

Table 36: General Troubleshooting
Problem
No LCD display indication and the green Transmitter
Status LED (D3) on the main circuit board is not
illuminated .
No LCD display indication and the green Transmitter
Status LED (D3) on the main circuit board is flashing.
The LCD display is scrambled or there is no LCD
display indication after touching the switches, LCD
display or circuit board.
The LCD display indicates "No Probes".
The LCD display indicates "DiffSensor Type".
The LCD display indicates "Too Many Sensors".
The last digit of the flow rate unit is displayed as a
lower case letter. (When the Field Calibration Wizard
is engaged, the last character of the flow rate units is
displayed as an upper case letter.
The green Transmitter Status LED (D3) on the main
circuit board is "ON" but not flashing.
The green Transmitter Status LED (D3) on the main
circuit board is flashing at 1-second intervals.
The green Transmitter Status LED (D3) on the main
circuit board is flashing at 2-second intervals.
The transmitter indicates airflow when the HVAC
system is not operating.
No output signal can be measured at the OUTPUT
terminal block of the transmitter.
The output signal on the transmitter fluctuates while
the flow and/or temperature readings on the LCD are
steady .
The LCD display does not match the readings
indicated by the host control system.
IM-1125-13 • REBEL ROOFTOPS
Possible Cause
Power switch not in the "ON" position.
Improper supply voltage to the power input terminal
block.
Blown fuse.
LCD contrast too low.
Static electricity.
The power switch on the transmitter was moved to
the "ON" position before the sensor probes were
connected.
Sensor probes have been mismatched.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
The microprocessor is not running.
No problem, normal operation.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Sensors are sensitive and can measure very low air
velocities. If a reading is indicated, there is airflow
present where the airflow measuring station is
located.
Output card is not securely mounted on main circuit
board .
Blown output fuse (output 1 and output 2 are fused
and protected independently on the transmitter).
The Low Limit airflow cutoff value is above the actual
airflow reading.
Electrical interference from other devices is creating
noise in the signal wires to the host control system.
The scaling in the host control system is incorrect.
88
Optional Outdoor Air Monitor
Remedy
Move the power switch to the "ON" position.
Ensure that 24VAC power is connected to L1 and L2
of the POWER terminal block and that the voltage
with the power switch in the "ON" position is between
22.8 and 26.4 VAC.
Check power wiring. Ensure that multiple devices
wired on a single transformer are wired "in-phase".
Replace fuse only with a 1.5 amp, fast-acting fuse
after the problem has been identified and corrected.
Turn "Contrast" potentiometer on the main circuit
board "clockwise".
Touch an earth-grounded object, such as a duct, to
discharge static electricity then reset the power. Avoid
direct contact with the LCD display or circuit board.
Reset 24VAC power by moving the power switch from
the "ON" to "OFF" position and then back to the "ON"
position .
Transmitters must have the same sensor type
connected (GP1, GF1 or GB1 sensor probes).
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe's hang tag.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
Reset 24VAC power by moving the power switch from
the "ON" to "OFF" position and then back to the "ON"
position .
No remedy required.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe's hang tag.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
Do not attempt to adjust zero ("offset"). Doing so will
result in an error in airflow measurement. The Low
Limit airflow cutoff value can be set to force the output
signal to zero.
Turn the transmitter power "OFF", and then press the
output card firmly onto main circuit board. Turn the
transmitter power back "ON".
Make sure that power has not been connected to
the output terminal block. Correct the problem and
replace with 0.125 amp, fast acting fuse only.
Make sure that the host control system is not
configured for a 2-wire device (no excitation voltage
should be present on the signals from the host
controls). Correct the problem and replace with 0.125
amp, fast acting fuse only.
Decrease the Low Limit airflow cutoff value in the
Setup menu until it is below the actual airflow reading.
The output signal wiring must be shielded. Individually
ground one or more of the following points: the signal
wire shield at host controls; signal wire shield at the
transmitter, or L2 of the power terminal block of the
transmitter .
Compare the current configuration of the transmitter
with that of the host control system. Compare the
minimum and full scale settings for each output by
navigating through the Setup menu.
www.DaikinApplied.com