8
900 Series V5.0: Installation Guide, April 1999
This product is used in fire detection and alarm systems that are required to provide volt-
free control signals to associated systems, such as automatic door-closers. This relay is
not supervised (monitored) and should not be used with high integrity applications where
the associated system must be continuously monitored for faults in the wiring between
the systems.
This base must not be connected to a mains supply. The maximum voltage applied
to the relay contact terminals must not exceed the Extra Low Voltage limits of 50
VAC and 75 VDC.
It is important to recognise that the relay cannot be controlled unless the base is fitted
with a fully functional Series 950/990 detector. Removing the detector or disconnecting its
supply will cause an energised relay to reset.
Under no circumstances connect an LED or any other device to the base terminals
marked -R and +R; instead use the terminals marked R1 and R2. R1 and R2 will have
the same polarity as L1 and L2 respectively.
Figure 4: Wiring diagram for DB950R
After installing the relay base and all other devices connected to the fire system, you
need to in-situ smoke or heat test the associated detector. Check that the fire detection
and alarm system and the system controlled by the relay operate correctly. Repeat this
test with the fire panel supplied only by its standby battery.
If the product has been subjected to an excessive shock during transportation, you might
receive it with the relay contacts in the 'set' position. Reset the relay by subjecting it to
one operating cycle before commissioning the system.
In accordance with the applicable local rules, regularly subject the detector to an in-situ
smoke or heat test and check that the relay and its associated system respond correctly.
Annually check the supply voltage and the integrity of the wiring. This product is not field
serviceable and must be replaced if any part is found to be defective. You can clean the
external surface of the base with a damp cloth.
Control panel
loop driver
Typical loop wiring
Remote LED
To associated
system
Series 950 low power
relay base
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