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Bosch | 6/04 | 49323C

6.0

Periodic Testing

Calibration is very important in determining the
detector’s continued operation. Depending on local
regulations, the frequency of calibration testing might be
required more than once a year. NFPA Standard 72
recommends a calibration test at installation and every
other year thereafter. Perform functional testing annually.

 

Notify all concerned parties before any fire 
alarm system maintenance or testing and 
again after test completion. 

 

To meet NFPA 72 requirements, check calibration using
any of the tests described in Section 6.1 Visual Check
through Section 6.3 Voltage Measurement Test. These tests
confirm whether or not the detector is within its
factory-marked calibration range.

6.1

Visual Check

The D285DH includes the Chamber Check Automatic
Trouble Indication, allowing it to automatically indicate
if its calibration is out of the factory-listed range.
Visually inspecting the D285DH and checking the LED
flash rate meets the NFPA guidelines for sensitivity
testing.

If the calibration is out of range for more than 24 h, the
D285DH alarm LED flashes once per second. The LED
flashes once every 4 sec when the detector is operating
normally.

Visually check all detectors before resetting the power.
Disconnecting the power erases this indication. If the
detector was reset within the last 24 h, or you are unsure
of the last reset time, perform the Magnet Test or
Voltage Measurement Test to confirm sensitivity.

6.2

Magnet Test

Place a magnet horizontally against the recess in the
duct housing cover and observe the LED.

If the detector is within the factory-marked
calibration range, it goes into alarm and the Alarm
LED latches ON.

If the detector is too sensitive, the LED on the head
flashes six times rapidly (once every 1/2 sec). Then
the detector goes into alarm.

If the detector is not sensitive enough, the LED on
the head flashes four times slowly (once every 2 sec).
Then the detector goes into alarm.

If the detector is not operational, it does not signal an
alarm.

6.3

Voltage Measurement Test

1.

Plug a D1005 Test Cable (optional) into the
calibration voltage pins (Figure 4).

2. Connect a digital voltmeter to the D1005 Test

Cable.

3. Connect the meter’s negative terminal to the

D1005’s black wire and connect the meter’s positive
terminal to the test cable’s red wire. The white wire
of the D1005 is not used.

4. If a D344-RT or D344-RL is installed, use voltage

monitor jacks. The voltage measured by the
voltmeter equals 1/2 the detector’s sensitivity
(in %/ft obscuration).

Multiply the voltage by 2. The result should be
within the factory-marked calibration range that is
printed on the label attached to the bottom of the
detector.

5. If the detector is outside of the factory marked

calibration range, remove it and clean it as
described in Section 5.0 Maintenance on page 4.

6. Recheck the calibration voltage measurement.

7.

If the detector remains outside the factory-marked
calibration range after cleaning, return it to Bosch
for re-calibration.

Figure 4:

Calibration Voltage Pins

1 - Calibration voltage pins

1

D285DH 

| Installation Instructions | 6.0

Periodic Testing

Summary of Contents for D285DH

Page 1: ...D285DH EN Installation Instructions Photoelectric Duct Smoke Detector ...

Page 2: ...e system supervision An end of line EOL resistor specified by the control manufacturer provides four wire supervision 2 0 Specifications Table 1 Specifications Description Only requires a base B is the UL compatibility identifier Refer to the Two Wire Smoke Detector Compatibility Technical Service Note P N 31866 to determine the identifier used with the D340 Series Duct Housing Operating Temperatu...

Page 3: ...tor D285DH Installation Instructions 3 0 Mounting Figure 1 Mounting the Base 1 Base contacts three sets 2 Start the detector contacts at these three places and rotate the base clockwise 1 R2 3 1 2 1 2 2 1 3 When the system is free of alarms check each detector to ensure the red LED head indicator flashes approximately every 4 sec This verifies the detector is receiving power and operating properly...

Page 4: ...ver tab away from the chamber cover Then pull the chamber cover up and away from the chamber refer to Item 2 in Figure 3 6 Remove dust and debris from the chassis area using clean dry compressed air or a vacuum 7 Replace the chamber to ensure the hole for the LED is properly aligned over the LED Align by placing the chamber parallel to the chassis and gently snapping the locking tabs into place 8 ...

Page 5: ...tivity 6 2 Magnet Test Place a magnet horizontally against the recess in the duct housing cover and observe the LED If the detector is within the factory marked calibration range it goes into alarm and the Alarm LED latches ON If the detector is too sensitive the LED on the head flashes six times rapidly once every 1 2 sec Then the detector goes into alarm If the detector is not sensitive enough t...

Page 6: ...Bosch 6 04 49323C 6 D285DH Installation Instructions Notes ...

Page 7: ...7 Bosch 6 04 49323C D285DH Installation Instructions Notes ...

Page 8: ...Bosch 130 Perinton Parkway Fairport NY 14450 9199 USA Customer Service 800 289 0096 Technical Support 888 886 6189 2004 Bosch 49323C ...

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