Automation, Inc.
™
28
TM_GF-
A
2
1
00_2200_R1A
GF-A2100
AND
GF-A2200 A
IRFLOW
M
EASUREMENT
S
TATION
Air Flow Measurement, PID Control and Alarm Solution - Analog Output
GreenTrol Automation, Inc.
•
156 Holly View Lane Loris, SC 29569
•
Toll Free: 877-4GN-TROL (877.446.8765)
•
Internet:
GreenTrol.com
Problem
Possible Cause
Remedy
No LCD display indication and the green ACT LED on
the main circuit board is not illuminated.
Power is not available at transmitter.
Apply 24VAC power to the transmitter.
Improper supply voltage to the power input terminal
block.
Ensure that 24VAC power is connected at terminal 7
(ground at terminal 6) of the Wiring Terminal Block and
that with power applied to the transmitter, voltage is
between 22.8 and 26.4 VAC.
Blown fuse.
Check power wiring. Ensure that multiple devices wired
on a single transformer are wired "in-phase". Replace
fuse only after the problem has been identified and
corrected, using an identical 1.0 amp, fast-acting fuse .
No LCD display indication and the green ACT LED on
the main circuit board is flashing.
LCD contrast too low.
Adjust “LCD Contrast” potentiometer on the main cir-
cuit board to improve display.
The LCD display is scrambled or there is no LCD display
indication after touching the switches, LCD display or
circuit board.
Static electricity.
Touch an earth-grounded object, such as a duct, to dis-
charge static electricity then reset the power. Avoid
direct contact with the LCD display or circuit board.
The LCD display indicates "No Probes".
Power applied to transmitter before sensor probe was
connected.
Cycle 24VAC power "OFF" and then back "ON" to the
transmitter.
The LCD display indicates "Too Many Sensors".
Wrong probe connected to transmitter.
Verify proper sensor probe/connection to transmitter.
The last character of the flow rate units is displayed as
a lower case letter. (Also, to indicate when the Field
Calibration Wizard is engaged, the last character of the
flow rate units is displayed as an upper case letter.)
The sensor detection system has detected a malfunc-
tioning or missing sensor.
Check sensor probe cable connection. If connection is
OK contact customer service for further assistance.
Wrong probe connected to transmitter.
Verify proper sensor probe/connection to transmitter.
The green ACT LED on the main circuit board is steady
"ON", not flashing.
Transmitter microprocessor is not running.
Cycle 24VAC power "OFF" and then back "ON" to the
transmitter.
The green ACT LED on the main circuit board is flashing
at 1-second intervals.
No problem, normal operation.
No remedy required.
The green ACT LED on the main circuit board is flashing
at 2-second intervals.
The sensor detection system has detected a malfunc-
tioning or missing sensor.
Check sensor probe cable connection. If connection is
OK contact customer service for further assistance.
Wrong probe connected to transmitter.
Verify proper sensor probe/connection to transmitter.
The transmitter indicates airflow when the HVAC sys-
tem is not operating.
Sensors are sensitive and will measure very low air
velocities. If a reading is indicated, there is airflow
present where the airflow measuring station is located.
Do not attempt to adjust zero ("offset") since 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 at very low flows.
No analog output signal is measured at Analog Output
(terminals 1 and/or 3 +, terminal 2 ground) of Wiring
Terminal Block of the transmitter.
Improper output wiring.
Verify that 24VAC power is connected at pin 7, and
ground at pin 6 of the Wiring Terminal block.
Verify that the other non-isolated devices that are sup-
plied with the same 24VAC power source are wired in-
phase (24V power to 24VAC power, ground to ground).
The power input of the transmitter is a half wave rectifi-
er, and requires that all common devices be wired with
common power and ground connections.
The Low Limit airflow cutoff value is above the actual
airflow reading.
Decrease the Low Limit airflow cutoff value in the
Setup Menu until it is below the actual airflow reading.
The analog output signal from the transmitter fluctu-
ates while the airflow and/or temperature readings on
the LCD are steady.
Electrical interference from other devices is creating
noise in the signal wires to the host control system.
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 pin 6 of the Wiring Terminal block of the
transmitter.
The LCD display does not match the readings indicated
by the host control system.
The scaling in the host control system is incorrect.
Compare the current configuration of the transmitter
with that of the host control system. Compare the min-
imum and full scale settings for each output by navigat-
ing through the Setup Menu.
GREENTROL STANDARD LIMITED PARTS WARRANTY
Greentrol products are warranted for 12 months from shipment. Product will be repaired/replaced free of charge as
described in the Terms and Conditions of Sale.
MAINTENANCE
When transmitter and probe(s) are installed in accordance with recommended guidelines, instrument difficulties are
rare. Issues can be easily resolved by viewing Diagnostic data from the Diagnostic Menu (Figure 15) and by proceeding
through the troubleshooting guide of Table 4.
Troubleshooting
Table 4. Troubleshooting