1.Turn off power to the system.

2.Remove and inspect sampling tube filters.

3.If filters are heavily coated with dirt, replace them with new filters. If they are not heavily coated, use a vacuum cleaner or compressed air nozzle to remove dust, then install the filters.

4.Remove the detector from the housing. (See Figure 8.)

Photo Units

5.Remove the detector cover by inserting a small-bladed screwdriver into the slot located approximately 90 degrees from the MOD400 test jack. Rotate the cover counterclockwise to remove it. See Figure 10.

6.Lift the screen from the photo chamber. Vacuum the screen and cover before using clean, compressed air to loosen and blow out any remaining debris (replacement screens are available, part no. RS24).

7.Vacuum the photo chamber. Then, use clean compressed air to blow it clean.

8.Replace the screen by aligning the arrow on top with the test slot in the base of the detector. Press the screen into place. It should fit tightly in the chamber.

Ion Units

9.See Figure 11. Remove the cover and screen assembly by depressing the three lock prongs on the top of the cover and rotating the cover counterclockwise. The CRT400 Cover Removal Tool makes cover removal easier.

10.Carefully pull the screen out of the cover.

11.Clean the screen thoroughly with a soft brush or vacu- um cleaner (replacement screens, part no. RS14).

12.Brush or vacuum the inside of the cover. The cover may then be blown out using clean compressed air.

13.Vacuum the sensing chamber before using clean, compressed air to loosen and blow out any remaining debris.

14.Press the screen back into the cover.

15.Replace the detector cover on the sensing chamber. Rotate it clockwise to lock it in place.

Both Types Of Units

16.Reinstall the detector in its housing.

17.Restore system power.

18.Put detector into alarm using appropriate method described in STEP 7.

Perform Detector Check

19.Notify the proper authorities that testing has been

completed and the smoke detector system is back in oper- ation.

20.Other checks that should be made during maintenance procedures:

—Holes or cracks in duct work near vicinity of detec- tor.

—Air leaks where detector housing or sampling tubes are attached to duct.

—Dust accumulations in or on sampling tubes.

—Wiring terminal screw tightness.

Figure 10. Photo head exploded view:

Figure 11. Ion head, exploded view:

REMOVABLE HEAD COVER

REMOVABLE

COVER

FOR

CLEANING

TEST SLOT

 

REMOVABLE SCREEN

 

(P/N RS14)

CLEANABLE SCREEN

 

P/N RS24 (W/O THERMAL)

LOCK PRONG

 

SENSING CHAMBER

HEAD COVER

REMOVAL SLOT

VANED CHAMBER

H0246-00

H0261-00

D500-07-00

9

I56-432-11R

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Image 9
System Sensor DH500ACDC specifications Photo Units, Ion Units
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DH500ACDC specifications

The System Sensor DH500ACDC is a versatile and reliable heat detector that has gained a reputation for its advanced technology and robust features, making it an ideal choice for both commercial and residential fire safety applications. This heat detector is designed to enhance fire detection systems by providing accurate temperature monitoring and fast response times, thereby ensuring optimal safety for buildings and their occupants.

One of the standout features of the DH500ACDC is its dual power source capability, allowing it to operate seamlessly on both AC and DC power. This flexibility ensures that the detector continues to function efficiently even during power outages, making it an essential component of any comprehensive fire safety system. The ability to work with varied power sources maximizes its usability across different environments.

Equipped with a sophisticated thermal sensing element, the DH500ACDC is capable of detecting high temperatures or rapid rises in temperature. Its fixed temperature setting, combined with its rate of rise detection feature, enables it to quickly identify potential fire hazards. This dual mechanism significantly reduces the likelihood of false alarms while maintaining sensitivity to genuine threats.

The device is built for durability and reliability. Featuring a rugged construction, it is designed to withstand harsh environmental conditions, making it suitable for industrial settings, warehouses, and other challenging environments. Additionally, the detector's low-profile design allows for easy installation and minimal aesthetic disruption in any setting.

Another noteworthy characteristic of the DH500ACDC is its compatibility with various fire alarm control panels. This interoperability facilitates seamless integration into existing systems, enhancing overall functionality without the need for extensive modifications. This feature is particularly beneficial for organizations looking to upgrade their fire safety infrastructure.

Moreover, the DH500ACDC has undergone rigorous testing and complies with international standards, ensuring quality and performance that fire safety professionals can trust. Its comprehensive range of features, alongside its advanced technologies, make it a top choice for those seeking to enhance their fire detection capabilities.

In conclusion, the System Sensor DH500ACDC represents a significant advancement in heat detection technology. Its dual power source capability, sophisticated sensing mechanisms, rugged construction, and compatibility with fire alarm systems make it an indispensable tool in safeguarding lives and property against the dangers of fire. This detector embodies the commitment to safety that System Sensor is known for, providing peace of mind to users in various applications.
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