System Sensor DH500ACDC Installation And Maintenance Instructions Manual page 10

Accessories
Remote LED
Piezo Alert Sounder
Replacement Filters
Magnet
End Plug For Sampling Tube
Installation Kit (Parts bag)
Ionization Replacement Screen
Sensitivity Test Kit
Ionization Cover Removal Tool
Remote Test Station
Programming Specifications/Requirements For
Intelligent System Control Panels
Models 1551 and 2551 can be used with the DH500ACDC if
the following constraints are observed.
1. There may be a limit to the number of devices per zone
that can have their LEDs latched on. The number of
devices is determined by the control panel and its abil-
ity to supply LED current. If more than the maximum
number of devices is on the same loop, do NOT use
the DH500ACDC for control purposes. Control for duct
applications would need to come directly from the con-
trol panel or by using control modules.
D500-07-00
Part No.
RA400ZA
PA400
F36-05-00
M02-04-00
P48-21-00
A2650-01
RS14
MOD400R
CRT400
RTS451/RTS451KEY
CAUTION
2. The duct control circuitry (auxiliary relay contacts and
auxiliary alarm output) may change states if the sensor
is tested and the LED is turned on for more than 4 sec-
onds. If the LED is latched on for less than 4 seconds,
the control circuitry of the DH500ACDC will NOT oper-
ate.
3. The panel must not poll the same unit for more than
4 seconds continuously or the auxiliary relay and aux-
iliary alarm output may switch states. After 4 seconds
of continual polling of a device, the panel must wait a
minimum of 100ms before polling or communicating to
that same device.
4. Communications must not cease for more than 3 sec-
onds without an additional clock pulse (after Pulse
Width 5) to turn off the LED on the sensor.
5. To allow the auxiliary relay and auxiliary alarm output
to return to a standby condition, (after being in alarm)
the panel must wait a minimum of 100ms after turning
off the sensor LED before communicating to that device
again.
10 I56-432-11R