Siemens Industry, Inc.
Building Technologies Division
7
P/N A6V10330327_a_en
Air Duct Sampling Tube Pressure Measurement
The Model PDM-3 Pressure Differential Measuring device
should be used to ensure that the sampling tube pressure
differential is within the specified limits. The differential pressure
between the two tubes should be greater than 0.01 inches of
water and less than 1.2 inches of water. Qualified personnel
should take measurements in accordance with the PDM-3
instructions, P/N 315-085535.
WIRING
Conduit Knockouts
To remove plastic knockout, first cut the plastic tab on the
specific knockout. Refer to Figure 4 to locate the tab. Then,
using a screw driver placed at the tab location, tap with a
hammer until the knockout breaks out. Clean the hole before
installing conduit.
3/4” KNOCKOUTS
1/2” KNOCKOUT
PLASTIC
TAB
Figure 4
Removing the Knockouts
Wiring
FDBZ492-PR terminal wiring connections are shown in Figure 5.
Note any limitations on the number of detectors and restrictions on
the use of remote devices permitted for each circuit.
Do not use looped wire under
Do not use looped wire under
Do not use looped wire under
Do not use looped wire under
Do not use looped wire under t
t
t
t
terminals.
erminals.
erminals.
erminals.
erminals. Break wire run to
Break wire run to
Break wire run to
Break wire run to
Break wire run to
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provide for
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proper supervision of connect
supervision of connect
supervision of connect
supervision of connect
supervision of connections.
ions.
ions.
ions.
ions.
With detector head removed, connect one of the appropriate
dedicated power sources to the applicable terminals (Refer to
Figure 5). Replace detector head and depress the cover removal
switch (SW1) on the PCB assembly and the unit will be ener-
gized. The green power LED will be illuminated, and when
pressing the test/reset button (SW2) on the PCB assembly, the
red alarm LED will be illuminated. This test confirms the correct
basic operation of the duct smoke unit, excluding the detector
head (see functional testing).
Wire the FDBZ492-PR as a stand alone unit as shown in Figure 6.
Wire the FDBZ492-PR as part of a FACP as shown in Figure 7.
Wire the FDBZ492-PR accessories as shown in Figures 7 and 8.