Bosch Appliances Smoke Alarm D2071A User Manual
Bosch | 09/04 | 74-06200-000-F
10
D2071A | Operations & Installation Guide |
2.1
Earth Ground Wiring
Only use Terminal 3, not telephone or
electrical ground, for earth ground
connections.
electrical ground, for earth ground
connections.
2.1.1
12 VAC Mode
To prevent damage from electrostatic charges or other
transient electrical surges, use 16 AWG (1.5 mm) wire to
connect the D2071A to earth ground at Terminal 3
before making other connections to the control panel. A
grounding rod or cold water pipe are good earth ground
references.
transient electrical surges, use 16 AWG (1.5 mm) wire to
connect the D2071A to earth ground at Terminal 3
before making other connections to the control panel. A
grounding rod or cold water pipe are good earth ground
references.
2.1.2
24 VDC Mode
When the D2071A is connected to an
FACP 24 VDC output, do not connect
Terminal 3 to earth ground. This might
cause a continuous ground fault condition
on the FACP.
FACP 24 VDC output, do not connect
Terminal 3 to earth ground. This might
cause a continuous ground fault condition
on the FACP.
2.2
Zone 1, Alarm Initiating Circuit
Use Terminals 6, 7, 8, and 9 for Zone 1
alarm initiating circuit connections.
alarm initiating circuit connections.
Zone 1 is a four-wire, Class “A” initiating circuit. You
can connect up to five waterflow alarm switches or up to
100 mechanically operated devices such as heat
detectors or manual pull stations to this zone. NFPA 72
requires you to connect a single pull station with
waterflow switches. The AHJ might specify the location
of this pull station. Other than this exception, do not
combine waterflow switches with other types of devices.
can connect up to five waterflow alarm switches or up to
100 mechanically operated devices such as heat
detectors or manual pull stations to this zone. NFPA 72
requires you to connect a single pull station with
waterflow switches. The AHJ might specify the location
of this pull station. Other than this exception, do not
combine waterflow switches with other types of devices.
Unlike the two-wire Class “B” circuits supervised by
EOL resistors, the double loop Class “A” circuit
provides alarm response from all initiating devices with
a single open or ground fault condition on the circuit.
Connect the initiating devices to the D2071A as shown
in Figure 2 on page 8 and Figure 3 on page 9.
EOL resistors, the double loop Class “A” circuit
provides alarm response from all initiating devices with
a single open or ground fault condition on the circuit.
Connect the initiating devices to the D2071A as shown
in Figure 2 on page 8 and Figure 3 on page 9.
The D2071A has programmable retard (retard time) and
reset (reset time) timers for waterflow alarm installations
on wet pipe sprinkler systems. These timers compensate
for water pressure surges and sprinkler alarm valve
fanning conditions.
reset (reset time) timers for waterflow alarm installations
on wet pipe sprinkler systems. These timers compensate
for water pressure surges and sprinkler alarm valve
fanning conditions.
2.2.1
Class “A” Circuit Parameters
The maximum resistance on the Class “A” circuit sensor
loop wiring is 100
loop wiring is 100
Ω
per loop (between A1 and A2
100
Ω
maximum, between B1 and B2 100
Ω
maximum).
To determine the circuit’s electrical condition:
1.
Ensure the D2071A is powered up and the loops are
in a normal condition.
in a normal condition.
2. Use a multimeter to measure the voltage across the
terminal connections. Connect one lead of the
multimeter to a negative (-) terminal (6 or 7).
Connect the other lead to a positive (+) terminal (8
or 9).
multimeter to a negative (-) terminal (6 or 7).
Connect the other lead to a positive (+) terminal (8
or 9).
The measured zone input voltage reading for the
electrical condition multimeter is Normal when
Terminals 7 and 8 equal 1.0 VDC to 1.9 VDC, and
Alarm (shorted) when Terminals 7 and 8 equal
0.0 VDC to 0.3 VDC.
electrical condition multimeter is Normal when
Terminals 7 and 8 equal 1.0 VDC to 1.9 VDC, and
Alarm (shorted) when Terminals 7 and 8 equal
0.0 VDC to 0.3 VDC.
2.2.2
Retard and Reset Times
Only use the Zone 1 retard or reset feature
for waterflow switches and controls without
their own retard and reset features.
for waterflow switches and controls without
their own retard and reset features.
The retard timer prevents false alarms from conditions
such as water supply surges in wet pipe sprinkler
systems. These surges can occur during a brief
activation of a waterflow alarm switch. The value you
enter in Retard Time determines the length of time the
waterflow switch remains activated before an Alarm
Report is initiated. Generally, a 15-sec retard is adequate,
but a longer interval might be necessary during
extended surge conditions.
such as water supply surges in wet pipe sprinkler
systems. These surges can occur during a brief
activation of a waterflow alarm switch. The value you
enter in Retard Time determines the length of time the
waterflow switch remains activated before an Alarm
Report is initiated. Generally, a 15-sec retard is adequate,
but a longer interval might be necessary during
extended surge conditions.
Reset Time is the parameter that compensates for
sprinkler alarm valve fanning conditions in wet pipe
systems with unique hydraulic problems. Fanning occurs
when a sprinkler head activates or the inspector’s test
valve opens and the waterflow switch does not activate
long enough to overcome the retard time, but the
waterflow switch cycles between alarm and normal
conditions.
sprinkler alarm valve fanning conditions in wet pipe
systems with unique hydraulic problems. Fanning occurs
when a sprinkler head activates or the inspector’s test
valve opens and the waterflow switch does not activate
long enough to overcome the retard time, but the
waterflow switch cycles between alarm and normal
conditions.
The retard and reset timers work together as follows:
•
The retard timer tracks the time the alarm initiating
circuit is in the alarm condition. It begins counting
when the circuit enters the alarm condition.
circuit is in the alarm condition. It begins counting
when the circuit enters the alarm condition.
•
The reset timer determines when the retard timer
resets to zero. When the alarm initiating circuit
enters a non-alarm (restored or trouble) condition
after being in the alarm condition, the retard timer
stops at its current value and the reset timer begins
counting.
resets to zero. When the alarm initiating circuit
enters a non-alarm (restored or trouble) condition
after being in the alarm condition, the retard timer
stops at its current value and the reset timer begins
counting.
•
If another alarm condition is detected before the
reset timer reaches the value entered in reset time,
the retard timer resumes counting from where it
stopped and the reset timer is set to zero.
reset timer reaches the value entered in reset time,
the retard timer resumes counting from where it
stopped and the reset timer is set to zero.
2.0 Installation