Bosch D285 User manual

D285/D285TH
EN Installation Instructions
Photoelectric Smoke
Detectors

Bosch | 6/04 | 32029E2
D285/D285TH | Installation Instructions |
FCC Notice
The D285 Series Photoelectric Smoke Detectors (D285,
D285TH) comply with Part 15 of the Federal
Communications Commission (FCC) Rules. Operation
is subject to the following two conditions:
1. These detectors might not cause harmful
interference.
2. These detectors must accept any interference
received, including interference that might cause
undesirable operation.
Changes or modifications not expressly approved by
Bosch can void the user’s authority to operate the D285
Series Smoke Detectors.
1.0 Overview
The D285 Series are UL Listed, open-area,
photoelectric, smoke detectors designed for use with
commercial fire protective signaling systems and
household fire warning systems (refer to the National
Fire Alarm Code [NFPA 72]). These detectors are
available in two-wire and four-wire models, and have an
optional +135°F (+57°C) fixed-temperature heat sensor.
For commercial and industrial installations, space the
detectors 30 ft (9.2 m) apart as recommended by
NFPA 72.
When properly installed using the D280/D290 Series
Detector Bases, tamper protection is provided by in/out
wiring of the positive power line. This causes the
control to initiate a trouble signal when a detector is
removed from its base. The master control supervises
the two-wire systems. Four-wire system supervision is
provided by an end-of-line (EOL) power supervision
device such as a D275 or a D293E Power Supervision
Base and an EOL resistor (as specified by the control
manufacturer).
Refer to Table 1 for product descriptions.
Table 1: Product Description
D285 Detector only (requires base)
D285TH Detector with integral +135°F (+57°C) heat
sensor (requires base)
D285DH Detector only, for D340 Series Duct Smoke
Detectors
D287 Base only, two-wire
D292 Base only, four-wire
D293A Base only, four-wire, Form “C” auxiliary relay
D293E Base only for power supervision, four-wire,
EOL relay, Normally Open auxiliary relay
D293S Base only, four-wire, with sounder
D275 EOL supervision module for four-wire systems
TP280 Trim Plate 6 in. (16.2 cm) diameter
The letter “A” is the UL compatibility identifier for the
D285 Series. Refer to the Two-Wire Smoke Detector
Compatibility Technical Service Note (P/N: 31866) to
determine the UL compatibility identifier used with the
D287 Base.
Table 2: Specifications
Operating
Temperature
+32° to 100°F (0°C to +38°C )
0 to 95% relative humidity
(non-condensing)
Power Requirements
Standby
Voltage:
Two-wire: 8.5 VDC to 33 VDC
Four-wire: 10 VDC to 30 VDC
Maximum
RMS Ripple: 25% of DC input
Start-up
Current: 120 µA maximum
Standby
Current:
80 µA at 12 VDC
90 µA at 24 VDC
100 µA at 33 VDC
Note: The D293E equals 24 mA at 12 VDC and 24 VDC.
Alarm Current
Two-wire: Dependent on the control panel that limits
the alarm current to 100 mA maximum.
Four-wire: D292: 48 mA at 24 VDC and 51 mA at
24 VDC (70 mA maximum at 30 VDC)
D293E: 80 mA at 12 VDC and 24 VDC
(100 mA maximum at 30 VDC)
D293S: Base 48 mA at 12 VDC, sounder
15 mA at 12 VDC, 25 mA at
24 VDC
Power-up
Time: 22 sec maximum
Compatible Control Panels
Two-wire: Refer to the Two-Wire Smoke Detector
Compatibility Technical Service Note
(P/N: 31866).
Note: Bosch makes no claim (written, oral,
or implied) the D285 Series Smoke
Detectors work with any two-wire control
panels except those specified in the
Two-Wire Smoke Detector Compatibility
Technical Service Note (P/N: 31866).
Four-wire: Compatible with all UL Listed four-wire
control panels. Refer to the
manufacturer's installation instructions for
proper EOL resistor selection.
1.0 Overview

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2.0 Mounting
1. Before mounting, remove the dust cover from the
detector. The dust cover can be replaced during
construction periods, but it must be removed once
the alarm system is enabled.
The tamper screw is located in the recess
on the top of the dust cover.
2. Mount the base according to its instructions.
3. Mount the detector to the base by turning it
clockwise until it clicks into place. When it is secure,
the alignment line aligns with the tamper screw hole
(refer to Figure 1).
The D285 Series Smoke Detectors are
keyed. Do not force a detector onto its
bases.
3.0 Installation Testing
1. Check the wiring from the control panel to the last
head on each run for proper polarity and continuity.
a. Ensure each run terminates with an EOL
resistor as specified by the control panel
manufacturer.
b. Ensure the four-wire runs terminate with EOL
modules or D293E Bases.
2. Apply power to the system, checking for alarms and
troubles.
a. Note which detectors are in alarm (if any) and
then shut down the system.
b. Remove these detectors from their bases and
recheck the bases for proper wiring. If the
problems persist, replace the affected
detectors or swap them with known good
units. This determines if the problem is
caused by the detector or the base.
c. If a system alarm with no detector alarms is
present, remove all detectors and check the
wiring at each base. Pay close attention to the
wiring of each EOL resistor and EOL
module.
3. When the system is free of alarms, check each
detector to ensure the red LED indicator is flashing
approximately every 3 sec. This verifies the detector
is receiving power and operating properly.
4. Test each detector to ensure it will cause a control
panel alarm. This is the only way to ensure proper
operation. Alarm the detectors by doing one of the
following:
a. Place a magnet horizontally against the
detector’s side (centered over the “T” marked
on the head) to activate an internal reed
switch, or
b. Use a UL Listed aerosol smoke detector
tester such as the Home Safeguard Industries’
25S to simulate an alarm. Follow the
instructions with the aerosol smoke detector
tester.
When a detector alarms, the red LED
indicator activates and latches into the ON
position. Clear the alarm before proceeding
to the next detector.
5. Check the overall loading of the alarm loop by
measuring the voltage across each EOL resistor.
This voltage should equal or exceed the minimum
specified by the control panel manufacturer.
D285/D285TH | Installation Instructions | 2.0 Mounting
Figure 1: Mounting the Base
1 - Alignment arrow
2 - Base contacts (three sets)
12

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D285/D285TH | Installation Instructions |
4.0 Maintenance
Notify all concerned parties before and after
fire alarm system maintenance or testing.
At least once a year, clean the detector and base. Use a
vacuum or clean/dry compressed air, paying particular
attention to the screens. In dusty areas or areas of heavy
insect concentration, cleaning might be required more
often.
To clean the detectors:
1. Remove the detector from the base. Clean the base
with a clean cloth and common window cleaner.
2. Remove the detector’s cover. Use a thin, flathead
screwdriver to pry the chassis from the cover.
Insert the screwdriver into the cover slots and pry
up (refer to Item 1 in Figure 2).
3. Gently pry the cover tab away from the chamber
cover and pull the chamber cover up and away from
the chamber (refer to Item 2 in Figure 3).
4. Using clean, dry compressed air or a vacuum,
remove any dust or debris from the chassis area.
5. Replace the chamber. Ensure the hole for the LED
(and thermistor) is properly aligned over the LED
(and thermistor). Place the chamber parallel to the
chassis and gently snap the locking tabs into place.
6. Replace the detector’s cover, carefully aligning the
LED holes and thermistor.
7. Return the detector to its base.
After cleaning, test the detectors for proper
calibration using one of the tests described
in Sections 5.1 Visual Check, 5.2 Magnet
Test, or 5.3 Voltage Measurement Test on
page 5.
Do not paint the detectors. Paint or other
foreign matter covering the screens can
prohibit or retard smoke from entering the
detector.
4.0 Maintenance
Figure 2: Removing the Detector Base
1 - Cover slots (3)
2 - Detector chassis
3 - Cover
2
1
3
#1
Figure 3: Removing the Detector’s Chamber Cover
#2

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5.0 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 often than once a year. NFPA 72
recommends calibration tests be made at installation,
and then every other year. Perform a Functional Test
annually.
Notify all concerned parties before and after
any maintenance or testing of the fire alarm
system.
To meet the NFPA 72 requirement, check calibration
using any of the tests described in Section 5.1 Visual
Check through Section 5.4 Thermistor Test. These tests
confirm whether or not the detector is within its factory
marked calibration range.
5.1 Visual Check
This detector includes the Chamber Check Automatic
Trouble Indication allowing it to automatically indicate
when its calibration is out of the factory listed range. A
visual check allows you to meet the NFPA guidelines
for sensitivity testing by inspecting the detector and
checking the flash rate of the LED.
If the calibration is out of range for more than 24 h, the
detector’s alarm LED begins flashing once per second.
The LED flashes once every 3 sec when the detector is
operating normally.
Visually check all detectors before resetting the power.
Disconnecting the detector power erases this indication.
If the detector was reset within the last 24 h, or you are
unsure of the last reset time, perform a Magnet Test or
Voltage Measurement Test to confirm the sensitivity.
5.2 Magnet Test
Place a magnet horizontally against the detector,
centered over the “T” marked on the head. 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 rapidly
flashes six times (once every 1/2 sec) and the detector
goes into alarm.
• If the detector is not sensitive enough, the LED
flashes four times slowly (once every 2 sec) and the
detector goes into alarm.
• If the detector is not operational, it does not signal an
alarm.
Figure 4: Calibration Voltage Pins
1 - Calibration voltage pins
1
D285/D285TH | Installation Instructions | 5.0 Periodic Testing
5.3 Voltage Measurement Test
1. Plug a D1005 Test Cable (optional) into the
calibration voltage pins (refer to 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
D1005’s white wire is not used.
a. The voltage measured by the voltmeter is 1/2
the sensitivity (in %/ft obscuration) of the
detector.
b. Multiply the voltage by 2. The result should
be within the factory marked calibration
range printed on the label that is attached to
the bottom of the detector.
4. If the detector is outside of the factory marked
calibration range, remove it and clean is as
described in Section 4.0 Maintenance on page 4.
5. Recheck the calibration voltage measurement.
If the detector is still outside the factory marked
calibration range after cleaning, return the unit to
Bosch for re-calibration.
5.4 Thermistor Test
Expose the thermistor to a heat source (such as a hair
dryer or a shielded heat lamp) until the detector goes
into alarm and the alarm LED latches on. If the unit
does not go into alarm, return it to Bosch for repair.
Before proceeding to the next detector, clear
each test alarm.

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D285/D285TH | Installation Instructions |
Notes

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D285/D285TH | Installation Instructions |
Notes

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Fairport, NY 14450-9199 USA
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Technical Support: [phone]
© 2004 Bosch
32029E