version 4.7.2 ā July 10th, 2022 Firmware version V2.1.7 and higher
EXXFIRE Installation and Service Manual 97
Flow monitoring
The air flow of the smoke aspiration system is monitored in line with EN54-20.
During commissioning of the flow monitoring system (see section 6.1) flow variations during normal
operation are measured and at the end of commissioning threshold values are set relative to the
minimum and maximum flow values measured during the commissioning period.
The sensitivity of the flow monitoring function can be set to normal or low, as described in section
5.4. Factory settings are set to normal sensitivity.
Once the air flow monitoring system has been commissioned the system will monitor air flow and
generate a Fault condition if the flow gets out of boundaries.
The air flow monitoring system can generate three types of faults:
1. Flow fault 1 (fault code 88): this fault indicates the flow has exceeded the limit values as
determined during the commissioning period. The following actions can be taken:
a. Check integrity of the sampling pipe, nozzle and nozzle insert (if placed)
b. Check the air filter
c. Check leakage of the right cover panel
d. Perform a new commissioning cycle of the flow monitoring system (see section 6.1)
e. Set the sensitivity of the flow monitoring system to low (see section 5.4)
2. Flow fault 2 (fault code 99): this fault indicates that the flow level got too low during the
Commissioning of the flow monitoring system. The system requires a minimum level of flow
during the Commissioning cycle so that a sufficient flow rate is guaranteed during normal
operation of the system, even when the flow drops to just above the minimum flow level
before the system goes into fault. The following corrective actions can be taken in case of a
flow fault 2:
a. Check that the right cover panel of the system is correctly put in place and there is
no leakage (e.g. check that the earth cable of the right cover panel is not trapped
between the system and the cover panel)
b. Check that the red air tube and the sampling nozzle are not blocked
c. Reduce the length of the red air tube
d. Increase the diameter of the insert of the sampling nozzle
After taking corrective actions the commissioning cycle of the flow monitoring system can
be restarted by resetting flow fault 2 in the following manner:
i. Put the key switch in SERVICE position
ii. Press the UP or DOWN button on the UI panel until fault code 99 is shown
iii. Then press the RESET button until the fault code 99 disappears
Note: in case of connected systems this operation must be performed on
the Master system!
iv. Put the key switch back in NORMAL position and remove the key
3. Flow fault 3 (fault code AA): this fault indicates a problem with the flow sensor was
detected. This could happen in case of sudden changes in air flow or fast temperature
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