the duct smoke detector housing, and the LOW side of the transmitter to the exhaust tube of the duct smoke detec- tor housing. Measure and record the voltage drop across the 1000Ω resistor (measurement 2). Subtract the voltage recorded in measurement 1 from the voltage recorded in measurement 2. If the difference is greater than 0.15 volts, there is enough air flow through the duct smoke detector for proper operation.
Figure 7. Procedure for verifying air flow:
TO SAMPLING TUBE
TO EXHAUST TUBE
HIGH LOW
DIFFERENTIAL
PRESSURE
TRANSMITTER
15 TO 36VDC
SUPPLY
9 VOLT
BATTERY
9 VOLT
BATTERY
1000 OHM 5% 1 WATT RESISTOR | 9 VOLT |
| BATTERY |
VOLT METER
FLUKE MODEL 87
OR EQUIVALENT
[6.1.5] Filter Replacement
The filters do not substantially affect smoke performance even when up to 90% of the filter is clogged. Quarterly visual inspection usually suffices to determine whether the filters should be replaced because only a high percentage of contamination affects performance. If further testing is required, compare differential pressure readings with and without the filters installed. If the difference exceeds 10% replace the filters. In no case should the pressure differen- tial fall below 0.0015 inches of water.
[6.2] Standby, Alarm, And Sensitivity Tests [6.2.1] Standby And Trouble
Standby — Look for the presence of the flashing green LED through the transparent housing cover. The LED should flash approximately every 10 seconds.
Trouble — If the Green LED does not flash, then the de- tector lacks power (check wiring, panel, or power supply), the detector board is missing (replace), or the unit is defective (return for replacement).
Figure 8. System wiring diagram for
![[6.1.5] Filter Replacement](/images/new-backgrounds/55720/5572011xi2.webp){kind=small}
CAUTION
Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections.
UL LISTED | 1ST DETECTOR |
| LAST DETECTOR |
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COMPATIBLE |
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IN LOOP DH100LP |
| IN LOOP DH100LP |
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CONTROL PANEL |
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| DETECTOR |
| DETECTOR | EOL RESISTOR |
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| SPECIFIED BY |
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| BOARD |
| BOARD |
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| PANEL MANUFACTURER | |||||
| 7 | 6 |
| 7 | 6 | ||
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(+) |
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| (+) IN | (+) OUT |
| (+) IN | (+) OUT |
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| 4 |
| (+) | 4 | (+) |
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| (+) |
| (+) |
| E | ||
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| RA400Z (OPTIONAL) |
| RA400Z (OPTIONAL) | |||
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| O | ||
ALARM |
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| REMOTE ALARM LED |
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| REMOTE ALARM LED | |
INITIATION |
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| L | ||
5 |
| 5 |
| R | |||
LOOP |
| 2.8 VDC NOM. |
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| IN ALARM |
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| IN ALARM |
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| 8 |
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| 8 |
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STYLE D OPTIONAL WIRING
Figure 9. Wiring diagram for the DH100LP to RTS451/RTS451KEY:
DH100LP |
|
Test + | 1 |
Test / Reset – | 2 |
Reset + | 3 |
RA + | 4 |
RA – | 5 |
RTS451/RTS451KEY
5
Test
4
3
1 Alarm Reset
LED
2
6 |