Daikin MPS015 F Installation And Maintenance Manual page 52

Table 26: Transmitter Troubleshooting
Problem
The host control system is unable to communicate
with the transmitter.
The LCD display does not match the readings
indicated by the host control system.
The returned value for airflow is zero when airflow is
indicated on the LCD display of the transmitter.
The status point from the transmitter has a Trouble
value.
There is no value for the differential pressure point
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
Possible Cause
Output card is not securely mounted on main circuit
board .
Network signal wiring is not properly connected to the
transmitter or the host controls.
Network protocol is not properly set on the transmitter.
Network address is not properly set on the transmitter.
Network termination is not properly set on the
transmitter .
The Area or K factor of the transmitter does not match
that of the host controls.
The Low Limit airflow cutoff value is above the actual
airflow reading.
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.
Differential pressure is only available from transmitters
that have a Bi-directional Bleed Airflow Sensors
connected.
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PTIonal UTdoor
Remedy
Turn the transmitter power "OFF" and press the
output card firmly onto main circuit board. Turn the
transmitter power back "ON".
Verify that the network signal wires from the host
controls are connected to the proper terminals of the
OUTPUT block. On the transmitter OUTPUT terminal
block, NET+ is for A, NET- is for B and COM for
common.
Set network protocol based on the network
requirements and reset transmitter power.
Set address based on network requirements and
reset transmitter power. The address must be unique
for the network.
Set transmitter termination based on network
requirements and reset the transmitter power.
Compare the value of the Area or K factor of the
transmitter with that of the host control system and
make adjustments to ensure a match.
Decrease the Low Limit airflow cutoff value in the
Setup menu until it is below the actual airflow reading.
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.
If a differential pressure measurement is required,
contact your local Daikin Representative about a Bi-
directional Bleed Airflow Sensor.
www.DaikinApplied.com
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Ir onITor