User manual
D550-06-00  3  I56-1367-004R
Figure 4. Wiring diagram:
Detector Activates Sounder Base(s) - (Complies with UL268)
UL has approved grouping for up  to  six  B501BHT  base  with 
horn units. When wired as a group, any detector in the group 
that  has  its  LED’s  latched  on  by  the  panel  will  cause  other 
B501BHT  units  in  the  group  to  sound.  This  type  of  “local” 
grouping is  accomplished  by  wiring  the  grouped  devices  to-
INTELLIGENT
MONITOR
MODULE
(+) 2
(–)
1
67
U.L.
LISTED
EOL
RESISTOR
47K
U.L.
LISTED
EOL
RELAY
24V
5
4
123
5
4
123
5
4
123
(+) COMM.
(–) COMM.
(–) POWER
(+) POWER
U.L. LISTED COMPATIBLE
CONTROL PANEL
EXTERNAL
24V SUPPLY
CLASS A OPTIONAL WIRING
CLASS A OPTIONAL WIRING
*
GROUPING OF UP TO 6 MODEL B501BHT TEMPORAL TONE SOUNDER BASES.
OPTIONAL SOUNDER INTERCONNECT
*
gether using terminal 5, Sounder Base Interconnect, as shown 
in the diagram.
NOTE:  Since a  local grouping of horns is not supervised,  the 
groups can only be used as a supplementary evacuation system. 
It is not acceptable to group horns for primary alarm signaling.
C0474-00
UL LISTED 
COMPATIBLE 
CONTROL 
PA NEL
INTELLIGENT 
MONITOR 
MODULE
INTELLIGENT 
RELAY 
MODULE
FIRST 
SOUNDER 
BASE
(+) POWER
(–) POWER
LAST 
SOUNDER 
BASE
(–) COMM.
(+) COMM.
UL 
LISTED 
EOL 
RELAY 
24V
UL LISTED 
EOL 
RESISTOR 
47k
UL LISTED 
24V SUPPLY
SLC
(+)
(–) 
THIS IS A STANDARD RELAY 
MODULE CONFIGURED TO 
REVERSE THE POWER
OPTIONAL SOUNDER INTERCONNECT
*
*
GROUPING OF UP TO 6 MODEL B501BHT TEMPORAL TONE SOUNDER BASES.
†
†
Figure 5. Wiring diagram:
Detector Activates Sounder Base(s); Intelligent Relay Module Ac-
tivates All Sounder Bases - (Complies with UL 268 and UL 464)
UL has approved grouping of up to six B501BHT bases  with 
horn units. When wired as a group, any detector in the group 
that  has  its  LED’s  latched  on  by  the  panel  will  cause  other 
B501BHT  units  in  the  group  to  sound.    This  type  of  “local” 
C0968-00
grouping is  accomplished  by  wiring  the  grouped  devices  to-
gether using terminal 5, Sounder Base Interconnect, as shown 
in the diagram. 
NOTE:  Since a local grouping of horns is not supervised, the 
groups can only be used as a supplementary evacuation sys-
tem.    It  is  not  acceptable  to  group  horns  for  primary  alarm 
signaling.




