My panel is displaying a trouble "Internal Fault" on a smoke detector
"Internal Fault" on a smoke means the device couldn't be calibrated by the panel.
Clean the device by following the instructions below.
Replace the head and send the defective head in for recalibration or replacement to the National Repair Center at 800-289-0096 x2220.
Cleaning the D323A or D324A
Remove and disassemble the sensor
Follow the steps in this section to prepare the sensor for cleaning:
Remove the sensor from its base.
Disassemble sensor by following the NSRT-A100 instructions found at the end of this page.
Note: The NSRT-A100 is a Hochiki part number and can be ordered by calling Hochiki sales support at 714-522-2246 or Hochiki technical support at 800-845-6692
Clean the sensor
CAUTION: Do not attempt to remove the insect screen. Follow the steps in this section to prepare the sensor for cleaning:
Remove the Outer Cover of the sensor as specified on page 5 and set aside.
Place the sensor in the palm of your left hand and grasp the Chamber Cover with your right hand. Twist the Chamber Cover counter clockwise until the Cover Tabs clear the Tab Catches. Lift and separate the Chamber Cover from the Optical Unit.
Swab the Optical Unit with denatured alcohol using a small soft bristled brush.
Use dry clean compressed air to dry the optical unit and to remove any remaining particles.
Clean the Chamber Cover and Outer Cover in the same manner.
Reassemble the sensor.
Follow the steps in this section to reassemble the sensor.
Locate the Alignment Arrows on both the Chamber Cover and the Optical Unit.
Set the Chamber Cover onto the Optical Unit while making sure the Alignment Arrow 1 and Alignment Arrow 2 are aligned with one another.
Holding the sensor in your left hand and grasping the Chamber Cover with your right hand, rotate the Chamber Cover clockwise until the Cover Tabs snap into the Tab Catches.
Place the Outer Cover of the sensor nose down on a flat surface.
Align the Outer Cover Keys with the Recess in the Outer Cover (two orientations are possible, only one will fit properly).
With the Outer Cover Keys aligned with the Cover Recessed, press down firmly on the back of the sensor. The sensor will snap into the Outer Cover. The sensor is now ready to be returned to the base from which it was removed.
The sensor should be re-tested by following the test procedure found in the control panel literature.
NOTE: If after testing, the sensor is not working within the prescribed range then return it to the manufacturer for servicing.
Sensor Cover Removal Instructions
This section explains how to remove the outer cover from the D323A and D324A by using the NSRT-A100.
Remove and disassemble the sensor
Follow the steps in this section for removal of the sensor cover:
Place the sensor to be disassembled on the NSRT-A100 tool making sure that the Locator on the sensor is aligned as shown on the diagram.
Using your thumb and index finger rotate the sensor back and forth until it drops into place on the NSRT-A100.
Grasp the sensor firmly and rotate the sensor clockwise (approximately 30 deg.) until the Locator on the sensor lines up with the Mounting Ears of the NSRT-A100. The contact blades on the sensor will engage on the NSRT-A100 and will prevent further rotation.
The sensor cover is now disengaged from the sensor body and can be removed by pulling the sensor cover away from the NSRT-A100.
After the cover has been removed, refer to the sensor cleaning instructions to clean and reassemble the sensor.
The FLM-7024-ISO MUX bus isolator module is placed between devices on the MUX bus. A short on the bus causes activation of the isolators adjacent to either side of the short. This effectively separates all devices between the activated isolators from the rest of the bus. This prevents failure of the entire bus. When the short condition is removed, the isolators automatically restore the entire loop to normal operation.
Listed in the table below you will find the old DS MUX Device part number with the new MUX Device replacement. Replacement Part Numbers Old DS MUX Devices Description FPE-7039, D7039 DS9331, DS9431R MUX Card D7050-B6 MXB2W MUX Base D7044 MX361 Single Point D7044M MX361M Mini Single Point FMM-7045 MX310 Pull Station FMM-7045D MX310D Dual Action Pull Station D7052 MX363 Dual Point Module D7053 MX46 I/O Input/Output Modules D7050 MX250 MUX Smoke Head D7050TH MX250TH MUX Smoke Head with 135 Heat Sensor .
Part Numbers for Flush Mount Smokes - FPC-500, FCP-500-C, FCP-500-P, FAA-500-BB-UL, FCA-500, FAA-500-TR-P, FSP-500, FCA-500-E, FAA-500-TR-W, and FCP-500-C-P. To make ordering easier please refer to the Product Data-Sheet and order the kit part numbers.
Note: The Master - Slave application is used to save on popit addresses for a large systems. You can use one popit address for a long hall or one large room that would otherwise require several addresses to cover it. 1. The F220-B6PM is a 24 VDC 4-Wire Master Popited Base that supervises up to nineteen F220-B6 Two-Wire Slave Bases. The two-wire slave detectors then report as the master base address. 2. The F220-B6PS 4-Wire Popited Base operates on 12 or 24VDC that does not support 2-Wire Slave bases. 3. The F220-B6PS, F220-B6, and the F220-B6PM bases can use any of the following smoke or heat heads. F220-P - Photoelectric Smoke Detector F220-PTH - Photoelectric Smoke Detector with 135F/57C Heat Sensor F220-PTHC - Photoelectric Smoke Detector with 135F/57C Heat and Carbon Monoxide Sensors F220-135 - Electronic Rate of Rise/Fixed Temperature 135F/57C Heat Detector F220-135F - Electronic Fixed Temperature 135F/57C Heat Detector F220-190F - Electronic Fixed Temperature 190F/88C Heat Detector