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System Sensor 7251DH, Installation And Maintenance Instructions Manual

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System Sensor 7251DH Installation And Maintenance Instructions Manual Download Page 8

SS-400-000 

8 

I56-3065-000R 

©2007 System Sensor

DETECTOR TEST LOG

Detector Identification Information

Manufacturer & 

Detector Model:

Serial 

Number:

Date 

Installed:

Description of Detector Location:

The Results and Maintenance Data

Date 

Tested

Test 

Description

Test 

Results

Maintenance

Performed

Comments

firealarmresources.com

Summary of Contents for 7251DH

Page 1: ...Station Specifications Length 14 5 inches 36 7 cm Width 5 inches 12 7 cm Depth 3 5 inches 8 9 cm Weight 2 8 lbs 1 1 kg Operating Temperature Range 32 to 100 F 0 to 38 C Operating Humidity Range 10 to 93 Relative Humidity Duct Air Velocity 300 4000 ft min Voltage Range 15 32 VDC Peak Standby Current nominal 230uA at 24 VDC no communication 330uA at 24 VDC one communication every 5 sec with LED enab...

Page 2: ...uct Air Flow Direction and Velocity The 7251DH is designed to be used in air handling systems having air velocities of 300 to 4000 feet per minute Be sure to check en gineering specifications to ensure that the air velocity in the duct falls within these parameters If necessary an Alnor Model 6000 P velocity meter Dwyer 460 differential pressure gauge or their equivalent may be used to check the a...

Page 3: ... Figure 3B Installation of foam gaskets over sam pling tube bushings B Installation for Ducts More Than 8 Feet Wide NOTE To install inlet tubes in ducts more than 8 feet wide work must be performed inside the air duct Sampling of air in ducts wider than 8 feet is accomplished by using the ST 10 inlet sam pling tube Install the inlet tube as follows 1 Any tube over 3 feet long that doesn t protrude...

Page 4: ... EXHAUST TUBE AIR FLOW DIRECTION EXHAUST TUBE INLET TUBE INLET TUBE EXHAUST TUBE DETECTOR HOUSING AIR FLOW DIRECTION EXHAUST TUBE INLET TUBE DETECTOR HOUSING A B C D HORIZONTAL MOUNTING OF HOUSING VERTICAL MOUNTING OF HOUSING Figure 5 Tube mounting configurations with varying air flow direction and orientation of detector housing Vertical as well as horizontal mounting is acceptable H0109 00 the a...

Page 5: ...all the RTS451 RTS451KEY test coil connect the device as shown in Figure 11 wire runs must be limited to 25 ohms or less per interconnecting wire Place the coil in the detector housing with the arrow facing up and pointing toward the detector as in Figure 11 Attach the coil leads to the housing terminals as shown polarity is not important Firmly screw the bracket in place over the test coil 8 4 Tr...

Page 6: ...ine Comm Line Alarm Initiation Loop Comm Line ULC Listed Control Panel 1st Detector in Loop 2nd Detector in Loop The RTS451 RTS451KEY test coil circuit requires an external 24VDC power supply which must be UL listed Figure 9C System wiring diagram for duct detectors using a ULC listed control panel Figure 9A Figure 9B H0542 00 DETECTOR HEAD TEST COIL H0292 00 Figure 11 RTS451 RTS451KEY test coil i...

Page 7: ...y vacuuming or blowing out dust and particles 5 Replace the sensing chamber cover aligning the arrow on the top with arrow on the printed circuit board 6 To replace the screen place it over the chamber assembly turning it until it snaps into place 7 Replace the cover using the LEDs to align the cover and then gently pushing it until it locks into place 8 Reinstall the detector 9 Test the detector ...

Page 8: ...T LOG Detector Identification Information Manufacturer Detector Model Serial Number Date Installed Description of Detector Location The Results and Maintenance Data Date Tested Test Description Test Results Maintenance Performed Comments firealarmresources com ...

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