Step 7. Perform Detector Check

7.1 Air Flow

1.To verify sufficient sampling of ducted air, use a manom- eter to measure the differential pressure created from air flow across the sampling tubes. The pressure should measure no less than 0.01 inches of water and no greater than 1.20 inches of water.

2.To determine that smoke is capable of entering the sens- ing chamber, conduct a visual examination to note any obscurations around the sensing chamber. If a smoke test is required, blow smoke from a cigarette, cotton wick, or punk directly at the smoke detector head. It is important to plug the exhaust and sampling tube hole to prevent ducted air from blowing smoke away from the smoke detector head. Record all test records in the Detector Test Log at the end of this manual.

CAUTION

Remove the plugs after testing or the detector will not sense smoke in the air duct.

7.2 Alarm Tests

Before replacing the duct housing cover, check the detector interconnections. Check the DH500ACDC as follows:

A. M02-04-00 Magnet Test

1.Make sure power is applied to the detector.

2.Position the painted surface of the test magnet against the housing next to the rib molded onto the outside of the housing (see Figure 7).

3.The LEDs on the detector should latch on as should any accessories (PA400, RA400ZA, RTS451) and the alarm condition verified at the control panel. The control panel must be active to initiate an alarm.

Figure 6. Sampling tube filter installation:

INLET SAMPLING TUBE

FOAM GASKET

DETECTOR BASE

EXHAUST

FILTER ADAPTER

DETECTOR HEAD

SAMPLING TUBE

FILTERS

B. RTS451/RTS451KEY Remote Test Station

The RTS451/RTS451KEY Remote Test Station facili- tates testing of the duct detector alarm capability. The DH500ACDC duct detector cannot be reset by the RTS451/RTS451KEY. It must be reset at the system con- trol panel.

To install the RTS451/RTS451KEY test coil, connect the device as shown in Figure 9. Place the coil in the detector housing with the arrow facing up and pointing toward the detector as in Figure 9. Attach the coil leads to the housing terminals as shown; polarity is not important. Firmly screw the test coil mounting bracket in place over the test coil. The resistance of the wire connecting the remote test sta- tion to the duct detector must be less than 25 ohms.

7.3 MOD400R Sensitivity Test

After verification of alarm capability, use a MOD400R test module with a voltmeter to check detector sensitivity as described in the MOD400R installation manual. The hous- ing cover must be removed to perform this test.

If the MOD400R readings indicate that the sensor head is outside of the acceptable range, the sensor heads require cleaning (refer to Periodic Maintenance Requirements).

7.4 Trouble Test

The capability of trouble detection is tested by removing the detector head from the duct housing. The detector head is removed by rotating it counterclockwise about 10 degrees (Figure 8). The system control panel should indicate a trouble condition. Reinstalling the detector head should clear the trouble condition.

SAMPLING TUBE

MOUNTING

SCREWS

H0239-00

D500-07-00

7

I56-432-11R

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System Sensor DH500ACDC specifications Perform Detector Check Air Flow, Alarm Tests, MOD400R Sensitivity Test, Trouble Test
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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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