Xtralis, like the majority of manufacturers, is experiencing longer product lead times due to component shortages. As we actively work to improve this situation, your satisfaction remains our main priority. View our current estimated lead times. View High Resolution Image. Available in two models, the VLF covers up to m2 2, sq. Model Nos. DoP available for download here.
Product information is subject to change without notice. Product images may include options or accessories not included with the base model.
Product Guide. Product Comparison. Duct Smoke Detection. Through validation testing, Underwriters Laboratories Inc. The product must use a power supply conforming to EN Part 4. The product is compliant with EN sensitivity requirements provided the following. VLF mA nominal, mA in alarm. Please consult your Xtralis representative for information on operation outside.
Additional installation and product information is contained in the following documents,. Do not mount the detector with. Note: Ensure the mounting surface is flat. This will permit an air tight seal to be achieved between the sampling pipe and the tapered air ports on the detector. Warning: Prior to drilling the attachment holes for the mounting bracket, ensure that all mounting surfaces i.
Where the pipe network and cabling are already fitted, the bracket can be used to aid alignment of the detector with the pipes. The Installation procedure below explains this process. Remove all rough edges.
This is critical to obtain an air tight seal with the smoke detector. Position the air inlet centerline mark A , see Figure 4, of the mounting bracket against the end of the air inlet pipe. In the cut out section of the mounting bracket mark a line across the top of the cut out if metric size pipe is used or mark a line across the bottom of the cut out if Imperial size pipe is used. Slide the mounting bracket down up for inverted mounting until the top of the bracket aligns with the marked line.
Mark off and drill the 2 bracket mounting holes H. Screw the bracket to the wall. Hook the smoke detector onto the mounting bracket tabs and pull it down into place. Use the two M4 x 20 mm locking screws provided and screw them into the screw holes on the left and right side of the detector. See the items marked F in the Figure Detector removal on page 8. The air sampling pipe can now be attached and power connected.
See section Wiring connections on page 19 for connection information. Also see Inverting the user interface display on page 7. For inverted mounting applications, the VLF will require the user interface display to be turned o through This is carried out prior to installing the detector. Also see Mounting bracket orientation for upright and inverted mounting on page 6. Inverting the user interface display: 1. Place the detector on its back, push in the securing tab and lift up the field service access door.
Remove the 2 retaining screws and lift off the main cover. Disconnect the restraining strap from the clip C and the ribbon cable from the user interface card B and place the cover aside. Open the clips E. Reconnect the ribbon cable and the restraining strap. Replace the main cover and screw down the 2 retaining screws. Close the field service access door. The detector is now ready for inverted installation. Note: 1. Take the necessary steps to advise the monitoring authority of work being carried out and that the system needs to be disabled.
Turn off the power to the detector. Disconnect the sampling pipes. Unscrew the front cover retaining screws E. Lift off and swing down the front cover, a restraining strap will take the load.
For inverted mounted detectors the cover should be removed and placed aside. Disconnect all field wiring from the terminal block. Unscrew the two M4 x 20 mm locking screws on the left and right side of the detector. See the items marked F in the Figure Detector removal on page 8 Use a screw driver to push down the anti-tamper clip in hole A , at the same time, push the detector base up.
Lift the detector off the mounting bracket. Once the detector has been removed re-fit the front cover to keep the internal components safe from damage and the electrical cabling safe.
Note: For inverted mounted detectors, the front cover will need to be removed prior to unhooking the detector from the mounting bracket. Disconnect the retaining strap and the ribbon cable from the user interface card and place the cover aside. Note: Do not glue the air inlet pipe to the detector. This will void your warranty. Exhaust air pipe connections Where the VLF is located outside the protected area, consideration must be given to returning the exhaust air to the protected environment to balance pressure differences that may exist between the two areas.
In the majority of applications, this is not necessary as pressure differences are minimal. In some circumstances, the pre-engineered solutions in this manual may not be suitable and it is recommended that alternate designs are verified by a suitably qualified installer using ASPIRE2.
Examples of these circumstances are: where pressure differences exceed 50 Pa; in situations where the detector is located outside the protected area; in cases where the are hazardous substances inside the protected area eg hospital operating theatres, laboratories.
In these cases, the exhaust should be returned to the protected area. Return air pipes need to be as short as possible to minimize the effect of airflow resistance in the return air pipe network. Remove the fitted exhaust deflector and install a return air pipe where required.
Note: Do not glue the exhaust air pipe to the detector. Wiring connections Caution: Electrostatic discharge precautions need to be taken prior to removing the front cover from the detector otherwise damage may occur to the unit.
Detector cabling requirements The screw type terminals located on the termination card within the VLF will accept wire sizes 2 2 from 0. Lift off and swing down the front cover.
The terminal block is located on the right hand side of the detector. When the GPI function parameter is set to external, the detector shall indicate an external equipment fault condition by monitoring the line impedance. An End of Line EOL resistor is supplied with the product and must be assembled in parallel with the device to be monitored.
The EOL resistor provides a known termination to the external equipment, this allows the VLF to detect open or short circuits. Caution: These terminal blocks come assembled and should NOT be disassembled. Reset Detector is reset on activation of the GPI closing contact. Disable Detector is disabled while GPI is active contact closed and reset on de-activation of the input contact open.
Standby Detector is placed in standby disabled, plus aspirator turned off while GPI is active contact closed and reset on de-activation of the input contact open. Alarm set 1 Activation of GPI forces alarm threshold set 1 to be used. It overrides normal selection. Alarm set 2 Activation of GPI forces alarm threshold set 2 to be used. External Detector indicates a fault while the GPI is active contact closed.
Typically this is used to monitor external power supply units. If wire is broken to the monitoring device it will raise an Instant Fault Finder No. Caution: Check the product termination wiring label during installation and subsequent maintenance visits. Refer to the appropriate installation manual for connectivity instructions. NO Normally open contact of relay with no power applied. Common Common contact for the relay. Fault relay Action relay Fire 1 relay Figure 13 - Terminal block display, relays NC Normally closed contact of relay with no power applied.
Note: www. For example when there is no fault present, terminal 12 is held open and terminal 14 is held closed. When there is a fault present, terminal 12 is held closed and terminal 14 is held open. These are example drawings. Refer to the appropriate product manual for the exact wiring details of the third party equipment. Refer to the specific interface card installation sheet, product guide, or your local Xtralis VESDA support person for further information regarding installation and configuration of this card.
Were the detector and the mounting bracket intact in the box? Is the detector securely locked onto its mounting bracket? Note that the two mounting bracket securing-screws are provided in a separate bag with the detector. Is the sampling air pipe firmly connected to the air inlet port? Ensure the pipe is NOT glued. Have the power wires been connected to the correct terminals on the detector? If required, has the end of line resistor been connected?
Have the alarm signalling wires been terminated to the correct terminals of the detector? Has the Interface card been correctly installed according to the instructions provided if applicable?
Has the plug at the exhaust port been removed and the exhaust pipe if fitted not glued? Has the front cover been replaced correctly? Is the air sampling pipework installed and checked as per the site plans? Table 2 - Installation Checklist 16 www. The pre-engineered pipe networks have been designed with pressure, flow and transport time considerations.
They have been verified and are shown below. The pre-engineered designs assume the following constraints: 1. There must be no mixing of open hole and capillary tubes in a pipe network design. All sampling points must be of the same type. All sampling points must be evenly spaced in a pipe network design. Branched designs must use the same number of sampling points along each branch. Open hole designs must use the same size hole throughout the design.
Capillary tube designs must use the same size and length of capillary tube throughout the design. The distance from the detector to the first sampling point must be 1 to 2 times the distance between sampling points.
For example, if the sampling points are 4 meters apart, then the distance from the detector to the first sampling point must be between 4 and 8 meters. Single Pipe Network — max. Pipe Open Hole 5. Length ft. The set up below shows a single pipe arrangement with 4 sampling holes and a fitted end cap without a sampling hole. Branched Pipe Network — max. Pipe 5. C B C A Legend A Smoke detector B Sampling hole C End cap no hole Figure 19 - Open hole, branched pipe The set up below shows a branched pipe arrangement with 3 capillary drop pipes per branch and fitted end caps without sampling holes.
The 2 recommended coverage of the VLF is 0. This should be considered in conjunction with local codes and standard. Note: 20 o Rotate the air sampling hole approximately 45 away from the direction of the incoming airflow and towards the grille surface.
This will minimize the risk of a Low Flow Fault being recorded in situations where air flow changes e. Access to filters should not be restricted and pipe network should be easily removable by the use of socket unions For full details concerning return air grille sampling pipe network design, consult the Xtralis VESDA System Design Manual.
The table below shows the appropriate hole sizes for pre-engineered designs for return air grille set ups. Pipe Hole Size mm Hole Size in.
The VLF provides very early warning smoke detection specifically for small environments. The pre-engineered pipe network designs can support up to 6 sampling holes for single pipes and 8 sampling holes for branched pipe arrangements.
The number of sampling holes used can 1 be increased to 12 , however, ASPIRE2 will need to verify that the additional sampling holes can be supported. Sampling holes are positioned according to the standards relating to conventional point detector placement. The pre-engineered pipe network solutions described in sections Single pipe network on page 10 and Branched pipe network on page 11 achieved transport times of less than 60 seconds for open hole sampling and less than 90 seconds for capillary sampling.
Where the VLF is located outside the protected area e. The exhaust should also be returned to the protected area in cases where there are hazardous substances inside the protected area, eg hospital operating theatres.
Where practical considerations fall outside pre-engineered designs or where pressure differences exceed 50 Pa, in situations where the detector is located outside the protected area, the solutions presented in this manual may not be suitable and it is recommended that alternate designs are verified by a suitably qualified installer using ASPIRE2. Note: You should try to keep the sampling holes evenly spaced.
The AutoLearn function allows the unit to assess its environment and setup appropriate alarm and flow thresholds. For further information see Factory Defaults on page Note: Detectors should be commissioned with a smoke test. Prior to commissioning the detector, check: 1. That the power is connected and on. That the pipe network is clean and correctly fitted with all joints correctly seated and sealed except the endcaps and pipe which enters the detector which must not be glued.
That the exhaust deflector is fitted. AutoLearn functions can be de-activated by a second press of the appropriate button this will leave the thresholds at their default settings and not at the settings prior to AutoLearn. AutoLearn Smoke AutoLearn Smoke is initiated by pressing the recessed button numbered 1, which is located under the field service access door. During the AutoLearn Smoke process, the VLF determines the average smoke and peak smoke obscuration levels and sets suitable alarm thresholds for the operating environment.
This process will minimize false alarms due to normal environment smoke variations. At the start of the process the alarm thresholds are set to the default values. During this learning cycle, alarm conditions can be reported.
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