7-3
GF Series
Installation and Operation Manual
X-TMF-GF Series-MFC-eng
Part Number: 541B137AAG
March, 2010
Section 7 System Troubleshooting
Symptoms & Possible Causes Corrective Action
4. No gas flow above some set-point.
NOTE: When the setpoint is
increased beyond this point,
the GF1XX signal remains at
some value lower than the set-point.
Is the gas inlet/outlet differential Verify that the pressure is correct for
pressure sufficient? the gas and range. If required, adjust
regulator to achieve proper pressure
NOTE: If the pressure reading.
is too low, the valve voltage to the GF1XX
will be at its maximum output. This condition
will cause internal GF valve heating and
inability to properly reach desired flow setpoints.
Is the GF1XX calibrated for the Check GF1XX side label. Run a flow check to verify.
gas flow? If flow is incorrect, replace the GF1XX with a unit that
is calibrated properly.
5. No gas flow below some set-point.
NOTE: When the setpoint is
decreased below this point, the
GF1XX signal remains at
some value higher than the
setpoint.
Is the gas inlet/outlet differential Verify that the pressure is correct for
pressure too high, or above published this gas and range. If required, adjust
setpoints? regulator to achieve proper pressure
NOTE: If the differential pressure reading.
is too high, voltage to the
GF1XX will be at its maximum
value when the setpoint is
decreased below the point
where flow decreases.
Is the GF1XX leaking? Check for contamination. Test the GF1XX
for leak integrity. Replace the Unit
GF1XX if leakage is detected.
6. Gas flow, or GF1XX pressure reading
oscillates.
Is the GF1XX calibrated for the Check the GF1XX side can label. Run
gas flowing? a flow check to verify. If flow is incorrect,
replace the GF1XX.
Is there too much gas pressure Verify that the pressure is correct for
across the GF1XX? this gas and range. If required, adjust
regulator to achieve proper pressure
reading.
Table 7-2 GF1XX Troubleshooting Guide (Continued)
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