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2. The AirSense range of aspirating smoke detectors are designed to be low maintenance equipment, indicating a fault condition when attention is necessary. Maintenance procedures are ordinarily limited to visual and operational checks with the occasional dust separator replacement. The fault section of this guide aims to help correctly identify any indicated faults, offer an explanation and where possible give guidance on resolving the issue.The AirSense range of aspirating smoke detectors are designed to be low maintenance equipment, indicating a fault condition when attention is necessary. Maintenance procedures are ordinarily limited to visual and operational checks with the occasional dust separator replacement. The fault section of this guide aims to help correctly identify any indicated faults, offer an explanation and where possible give guidance on resolving the issue.
3. Identification It is important to identify what type of detector is installed when asking for assistance or ordering spare parts. It is important to identify what type of detector is installed when asking for assistance or ordering spares therefore model identification should precede any other activity involving the detector.
It is important to identify what type of detector is installed when asking for assistance or ordering spares therefore model identification should precede any other activity involving the detector.
4. Identification of Models Using the model number to identify the detector is the easiest way. All detectors will be fitted with an EPROM, a label on top of the EPROM also identifies the detector type. The detectors listed here are the “first generation” of Stratos detectors. Using the model number to identify the detector is the easiest way. All detectors will be fitted with an EPROM, a label on top of the EPROM also identifies the detector type. The detectors listed here are the “first generation” of Stratos detectors.
5. Identification of Models These “second generation” detectors are the latest addition to the AirSense range of products. These “second generation” detectors are the latest addition to the AirSense range of products.
6. Maintenance Maintenance – 3 monthlyMaintenance – 3 monthly
7. 1. Isolate the detector at the main fire panel.
Inspect the case for signs of physical damage, moisture ingress and ensure the detector is securely mounted to wall.
Note the flow readings as a benchmark for future service visits.
Rectify any faults as indicated on the front panel.
Check the correct operation of the front panel buttons (enable where necessary). 1. Isolate the detector at the main fire panel.
Inspect the case for signs of physical damage, moisture ingress and ensure the detector is securely mounted to wall.
Note the flow readings as a benchmark for future service visits.
Rectify any faults as indicated on the front panel.
Check the correct operation of the front panel buttons (enable where necessary).
8. Remove all power from the detector.
Ensure the smooth operation of lock mechanism.
Ensure all field wiring is secure and that all insulation material is undamaged.
Ensure the exhaust port is not blocked or obstructed. Remove all power from the detector.
Ensure the smooth operation of lock mechanism.
Ensure all field wiring is secure and that all insulation material is undamaged.
Ensure the exhaust port is not blocked or obstructed.
9. 10. After first taking the relevant safety precautions i.e. safety glasses, respiratory mask and gloves. Use an air duster to remove any debris from inside detector.
NB Health & Safety Notice. Unless suitable precautions are taken maintenance personnel may be exposed to a “Nuisance Dust” hazard as defined by the “Control of Substances Hazardous to Health (COSHH) Regulations.
11. Restore all power to the detector, mains first, followed by the battery.
10. After first taking the relevant safety precautions i.e. safety glasses, respiratory mask and gloves. Use an air duster to remove any debris from inside detector.
NB Health & Safety Notice. Unless suitable precautions are taken maintenance personnel may be exposed to a “Nuisance Dust” hazard as defined by the “Control of Substances Hazardous to Health (COSHH) Regulations.
11. Restore all power to the detector, mains first, followed by the battery.
10. 12. Carry out a functional smoke test on 25% of the system; subsequent functional testing must result in 100% system test per annum. Allow smoke to disperse and, if provided, the bar graph level on the relevant detector to return to normal before proceeding further.
13. De-isolate the detector at the main fire panel and place the relevant detection loop of main fire panel in to test or commissioning mode to allow relay testing.
14. Verify the correct operation of all relays through to main fire panel.
12. Carry out a functional smoke test on 25% of the system; subsequent functional testing must result in 100% system test per annum. Allow smoke to disperse and, if provided, the bar graph level on the relevant detector to return to normal before proceeding further.
13. De-isolate the detector at the main fire panel and place the relevant detection loop of main fire panel in to test or commissioning mode to allow relay testing.
14. Verify the correct operation of all relays through to main fire panel.
11. 15. Ensure that no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
15. Ensure that no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
12. Maintenance – 6 monthlyMaintenance – 6 monthly
13. Isolate detector at main fire panel to avoid a fault condition being reported.
2. Check the physical condition of the batteries; test the batteries to ensure that they hold sufficient charge to provide the required standby time: Replace where necessary.
3. Check the integrity of the sampling pipe network.
4. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
Isolate detector at main fire panel to avoid a fault condition being reported.
2. Check the physical condition of the batteries; test the batteries to ensure that they hold sufficient charge to provide the required standby time: Replace where necessary.
3. Check the integrity of the sampling pipe network.
4. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
14. Maintenance – 12 monthlyMaintenance – 12 monthly
15. Isolate detector at main fire panel to avoid a fault condition being reported.
2. Remove all power from the detector.
3. After first taking the relevant safety precautions i.e. safety glasses, respiratory mask and gloves, remove the aspirator, clean the plenum area and aspirator using an air duster.
NB Health & Safety Notice. Unless suitable precautions are taken, maintenance personnel may be exposed to a “Nuisance Dust” hazard as defined by the “Control of Substances Hazardous to Health (COSHH) RegulationsIsolate detector at main fire panel to avoid a fault condition being reported.
2. Remove all power from the detector.
3. After first taking the relevant safety precautions i.e. safety glasses, respiratory mask and gloves, remove the aspirator, clean the plenum area and aspirator using an air duster.
NB Health & Safety Notice. Unless suitable precautions are taken, maintenance personnel may be exposed to a “Nuisance Dust” hazard as defined by the “Control of Substances Hazardous to Health (COSHH) Regulations
16. 4. Inspect the sampling pipe network, checking that the sampling points are clean and clear of obstructions. Should dust accumulation be present in the sampling system, it is recommended that this contamination is removed.
5. Refit the aspirator and all other parts removed for cleaning.
6. Restore all power to the detector, mains first, followed by the battery. 4. Inspect the sampling pipe network, checking that the sampling points are clean and clear of obstructions. Should dust accumulation be present in the sampling system, it is recommended that this contamination is removed.
5. Refit the aspirator and all other parts removed for cleaning.
6. Restore all power to the detector, mains first, followed by the battery.
17. 7. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation. 7. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
18. 7. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation. 7. Ensure no existing faults or alarms are indicated on the detector front panel before restoring the main fire panel to normal operation.
23. Fault IdentificationFault Identification
24. Depending on the Type of System a Fault May Be Displayed As:
Depending on the Installed System a Fault May Be Displayed As: Depending on the Installed System a Fault May Be Displayed As:
25. Depending on the Type of System a Fault May Be Displayed As: A steadily illuminated amber LED A steadily illuminated amber LED
A steadily illuminated amber LED
26. Depending on the Type of System a Fault May Be Displayed As: A steadily illuminated amber LED
A flashing amber LED A flashing amber LEDA flashing amber LED
27. Depending on the Type of System a Fault May Be Displayed As: A steadily illuminated amber LED
A flashing amber LED
Text on a LCD screen Text on a LCD screen
Text on a LCD screen
28. Depending on the Type of System a Fault May Be Displayed As: A steadily illuminated amber LED
A flashing amber LED
Text on a LCD screen
A warning on a P.C. Monitor (SenseNET) A warning on a P.C. Monitor (SenseNET)A warning on a P.C. Monitor (SenseNET)
29. Frequency ? Does the fault occur on a regular basis ? Does the fault occur on a regular basis ?Does the fault occur on a regular basis ?
30. Frequency ? Does the fault occur on a regular basis ?
If so, does the time in the event log correspond to any activity within the area ? If so, does the time in the vent log correspond to any activity within the area ?If so, does the time in the vent log correspond to any activity within the area ?
31. Frequency ? Does the fault occur on a regular basis ?
If so, does the time in the event log correspond to any activity within the area ?
Daily, weekly or monthly a pattern may help trace the cause of the fault. Daily, weekly or monthly a pattern may help trace the cause of the fault.
Daily, weekly or monthly a pattern may help trace the cause of the fault.
33. A table of the fault indication on Package B type detectors extracted from the installers handbook. This is typical of the indication on all detectors in this series.
A table of the fault indication on Package B type detectors extracted from the installers handbook. This is typical of the indication on all detectors in this series.
34. In addition to the possibility of a blocked or broken pipe, there are some less obvious causes for an Air flow fault indication.
1. If there is a difference in air pressure between the area being protected and where the detector is located a piped exhaust should be used to return the sampled air. If this is the case a temporary exhaust could be arranged in order to verify the cause of the problem.
2. If the air handling is automatically being switched on and off on a duty/standby cycle this may trigger airflow faults at certain times. If the air handling is activated by a thermostat then the time of faults may be irregular. This could be verified by temporarily overriding the thermostat.
3. When a detector is used for duct sampling the installation method can be critical, for more information refer to the “return air register & duct sampling guide” which is available, free of charge, from our office's or can be downloaded from our website.
As it’s name suggests an airflow set-up period is used to determine the normal flow within the protected area. After a sufficient period the low & high thresholds are set, if the normal flow crosses the threshold then the relevant air flow fault is triggered.
Therefore the detector must experience the possible range of minimum & maximum airflows within this set-up period or the high & low thresholds must be altered to encompass all possibilities.
In addition to the possibility of a blocked or broken pipe, there are some less obvious causes for an Air flow fault indication.
1. If there is a difference in air pressure between the area being protected and where the detector is located a piped exhaust should be used to return the sampled air. If this is the case a temporary exhaust could be arranged in order to verify the cause of the problem.
2. If the air handling is automatically being switched on and off on a duty/standby cycle this may trigger airflow faults at certain times. If the air handling is activated by a thermostat then the time of faults may be irregular. This could be verified by temporarily overriding the thermostat.
3. When a detector is used for duct sampling the installation method can be critical, for more information refer to the “return air register & duct sampling guide” which is available, free of charge, from our office's or can be downloaded from our website.
As it’s name suggests an airflow set-up period is used to determine the normal flow within the protected area. After a sufficient period the low & high thresholds are set, if the normal flow crosses the threshold then the relevant air flow fault is triggered.
Therefore the detector must experience the possible range of minimum & maximum airflows within this set-up period or the high & low thresholds must be altered to encompass all possibilities.
35. If the detector fault LED is flashing, this indicates that data transmission between devices is not reliable. This could be caused by:
The incorrect type of cable.
Excessive cable length. The maximum total cable length for Series 1 detectors and mimic panels is 200 metres using a good quality cable. Series 2 detectors use RS485 data communication (A maximum 1.2 km between repeaters).
A short, break or incorrectly phased cable.
Poor termination of the cable.
Poor or incorrectly terminated cable screen.
If the fault LED is steadily illuminated a detector head or process error has occurred. If the fault fails to clear after a FastLearn has been initiated then the detector assembly should be returned to AirSense Technology for recalibration. Please note that the detector assembly must be returned complete with the detector/fan driver board. Depending on model the detector board is either located on top of the detector itself or on the bulkhead which divides the detector from the terminal board.
If the detector fault LED is flashing, this indicates that data transmission between devices is not reliable. This could be caused by:
The incorrect type of cable.
Excessive cable length. The maximum total cable length for Series 1 detectors and mimic panels is 200 metres using a good quality cable. Series 2 detectors use RS485 data communication (A maximum 1.2 km between repeaters).
A short, break or incorrectly phased cable.
Poor termination of the cable.
Poor or incorrectly terminated cable screen.
If the fault LED is steadily illuminated a detector head or process error has occurred. If the fault fails to clear after a FastLearn has been initiated then the detector assembly should be returned to AirSense Technology for recalibration. Please note that the detector assembly must be returned complete with the detector/fan driver board. Depending on model the detector board is either located on top of the detector itself or on the bulkhead which divides the detector from the terminal board.
36. When the detector Isolate LED is illuminated steadily the detector is isolated and incapable of generating an alarm relay output. Whilst isolated, the fault relay will be de-energised and report a fault signal will be reported. The isolate button has a toggle operation (Push once to isolate, push again to de-isolate) the reset button will not de-isolate the detector. This detector ON LED will flash to indicate that “Demo” mode has been initiated, this mode is explained within the “Basic Commissioning guide” and the relevant installers handbook.When the detector Isolate LED is illuminated steadily the detector is isolated and incapable of generating an alarm relay output. Whilst isolated, the fault relay will be de-energised and report a fault signal will be reported. The isolate button has a toggle operation (Push once to isolate, push again to de-isolate) the reset button will not de-isolate the detector. This detector ON LED will flash to indicate that “Demo” mode has been initiated, this mode is explained within the “Basic Commissioning guide” and the relevant installers handbook.
37. When the separator renew button is flashing, the separator or filter has been removed. A trip switch within the Package A, B or ES range of detectors is held in position by the cardboard outer case of the separator. If the outer case is allowed to become wet or damaged it may be incapable of supporting the switch lever. A pair of black twisted cables from the switch terminate at the detector board, a broken/damaged cable or connector may also trigger this fault signal.
If the separator renew fault LED is steadily illuminated then the separator needs to be replaced. In the case of Stratos-HSSD Package A, B, and ES detectors the dust separator must be replaced whilst the detector power is on.
Stratos-Quadra detectors are fitted with up to 4 separate filters, located behind the fan. Those detectors fitted with Rev 1.4 software or later should be powered down prior to changing the dust separators, due to there location. Those detectors operating on with an earlier revision of software should be upgraded to the current version. The software can be upgraded free of charge on an exchange/sale or return basis.
When the separator renew button is flashing, the separator or filter has been removed. A trip switch within the Package A, B or ES range of detectors is held in position by the cardboard outer case of the separator. If the outer case is allowed to become wet or damaged it may be incapable of supporting the switch lever. A pair of black twisted cables from the switch terminate at the detector board, a broken/damaged cable or connector may also trigger this fault signal.
If the separator renew fault LED is steadily illuminated then the separator needs to be replaced. In the case of Stratos-HSSD Package A, B, and ES detectors the dust separator must be replaced whilst the detector power is on.
Stratos-Quadra detectors are fitted with up to 4 separate filters, located behind the fan. Those detectors fitted with Rev 1.4 software or later should be powered down prior to changing the dust separators, due to there location. Those detectors operating on with an earlier revision of software should be upgraded to the current version. The software can be upgraded free of charge on an exchange/sale or return basis.
38. A flashing power fault LED relates to a faulty battery/s, the most common reasons are a discharged or disconnected battery. This may also be caused if batteries have been located remotely and voltage drop has not been properly accounted for. Also when the battery charge lead has been altered or extended the thin black feedback cable is often overlooked, if broken or disconnected an excessive charging voltage (approx 16 Volts) can be measured. Fuse 1 provides protection to the charging circuit and is located directly underneath the battery lead connection on the terminal board, this may be obscured by the rectifier which can be temporarily removed to gain access.
A steadily illuminated power fault LED indicates a mains problem. As the mains is converted to 24V at the transformer this can be caused by a blown spur fuse, mains incoming fuse, or fuse F3 (24 Volts).
The monitoring of both the battery and the mains takes a path through the ribbon cable which joins the terminal board to the control board, a fracture in the cable can result in this fault being displayed. On some earlier models the ribbon cable used was less robust and under certain conditions e.g. exaggerated opening and closing of the front door, the cable may become fractured. These earlier cables are grey in colour rather than the multicoloured cables currently used. With all power removed from the detector a multimeter can be used to check the continuity of the ribbon cable.
If the detector is left in an un-powered state for an extended period of time the memory back-up coin cell located on the control board can become discharged. This can load the data line and cause this and other spurious faults to be indicated. When at a potential of less than 2.9V the coin cell should be replaced. A flashing power fault LED relates to a faulty battery/s, the most common reasons are a discharged or disconnected battery. This may also be caused if batteries have been located remotely and voltage drop has not been properly accounted for. Also when the battery charge lead has been altered or extended the thin black feedback cable is often overlooked, if broken or disconnected an excessive charging voltage (approx 16 Volts) can be measured. Fuse 1 provides protection to the charging circuit and is located directly underneath the battery lead connection on the terminal board, this may be obscured by the rectifier which can be temporarily removed to gain access.
A steadily illuminated power fault LED indicates a mains problem. As the mains is converted to 24V at the transformer this can be caused by a blown spur fuse, mains incoming fuse, or fuse F3 (24 Volts).
The monitoring of both the battery and the mains takes a path through the ribbon cable which joins the terminal board to the control board, a fracture in the cable can result in this fault being displayed. On some earlier models the ribbon cable used was less robust and under certain conditions e.g. exaggerated opening and closing of the front door, the cable may become fractured. These earlier cables are grey in colour rather than the multicoloured cables currently used. With all power removed from the detector a multimeter can be used to check the continuity of the ribbon cable.
If the detector is left in an un-powered state for an extended period of time the memory back-up coin cell located on the control board can become discharged. This can load the data line and cause this and other spurious faults to be indicated. When at a potential of less than 2.9V the coin cell should be replaced.
40. Logical Process The fault reporting for Series 2 detectors is similar to that mentioned for series 1 detectors. Due to the increased features available on these models additional messages also report possible networking issues, such as broken cable loops. Therefore in order to arrive at the correct solution a similar thought process can be used.
The fault reporting for Series 2 detectors is similar to that mentioned for series 1 detectors. Due to the increased features available on these models additional messages also report possible networking issues, such as broken cable loops. Therefore in order to arrive at the correct solution a similar thought process can be used.
41. Logical Process Establish the type of fault Establish the type of fault
The most likely cause of a reoccurring fault can often be found by making a comparison with the internal fault log of the detector. As an example: Anything that regularly causes a fluctuation in air pressure or flow could be responsible for a flow fault;
Duty/Standby cycle of AHU’s causing a reduction of the negative pressure acting on a length of sampling pipe and subsequent flow increase/decrease.
Door opening in a pressurised area, leading to a drop in pressure and subsequent reduction in flow.
Regular blockage of sampling holes or return exhaust through ice, debris or vandalism.
A sudden dramatic increase/decrease in temperature.
Establish the type of fault
The most likely cause of a reoccurring fault can often be found by making a comparison with the internal fault log of the detector. As an example: Anything that regularly causes a fluctuation in air pressure or flow could be responsible for a flow fault;
Duty/Standby cycle of AHU’s causing a reduction of the negative pressure acting on a length of sampling pipe and subsequent flow increase/decrease.
Door opening in a pressurised area, leading to a drop in pressure and subsequent reduction in flow.
Regular blockage of sampling holes or return exhaust through ice, debris or vandalism.
A sudden dramatic increase/decrease in temperature.
42. Establish the type of fault A text message on the front panel LCD display of the standard Stratos-HSSD 2 detector will indicate the nature of any fault.
A text message on the front panel LCD display of the standard Stratos-HSSD 2 detector will indicate the nature of any fault.
43. Establish the type of fault For those detectors not fitted with a dedicated display the fault could be displayed at the Command Module.
For those detectors not fitted with a dedicated display the fault could be displayed at the Command Module.
44. Establish the type of fault Where a Command Module is not used a laptop computer, serial connection lead and appropriate software will be required to determine the fault.
Where a Command Module is not used a laptop computer, serial connection lead and appropriate software will be required to determine the fault.
45. Logical Process Establish the type of fault
The frequency of any reoccurring fault The most likely cause of a reoccurring fault can often be found by making a comparison with the internal fault log of the detector. As an example: Anything that regularly causes a fluctuation in air pressure or flow could be responsible for a flow fault, for example:
The duty/Standby cycle of AHU’s causing a reduction of the negative pressure acting on a length of sampling pipe and subsequent flow increase/decrease.
A door opening within a pressurised area, leading to a drop in pressure and subsequent reduction in flow.
The regular blockage of sampling holes or return exhaust through ice, debris or vandalism.
A sudden dramatic increase/decrease in temperature.
The most likely cause of a reoccurring fault can often be found by making a comparison with the internal fault log of the detector. As an example: Anything that regularly causes a fluctuation in air pressure or flow could be responsible for a flow fault, for example:
The duty/Standby cycle of AHU’s causing a reduction of the negative pressure acting on a length of sampling pipe and subsequent flow increase/decrease.
A door opening within a pressurised area, leading to a drop in pressure and subsequent reduction in flow.
The regular blockage of sampling holes or return exhaust through ice, debris or vandalism.
A sudden dramatic increase/decrease in temperature.
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