Figure 3-2 Connections For Multiple Audio Booster In Two-Wire Mode (Spb-80/4) - Wheelock SAFEPATH4 Application, Installation, Operation, And Maintenance Manual

Connections for Multiple Audio Booster in Four-Wire Mode
On the master Audio Booster panel, connect the SP40/2 "normally open" and "common" alarm
relay connections to the AUX IN connections. Connect a UL Listed 10K Ohm EOLR across the
SP40/2 Alarm Relay connections. Place the switch SW1 in the "CC" position. Remove jumper
on W1 and W10.
Connect the EXP OUT on the master Audio Booster to the AUX IN of the second Audio Booster.
Connect the AUX RET to the next Audio Booster AUX IN and continue to the last Audio Booster.
Connect the UL Listed 10K Ohm EOLR on the last AUX RET on the last Audio Booster.
On Audio Booster panels 2 through 33, set SW1 to NAC. Insure jumper W1 is in place. Remove
jumper W10.
NOTE: When the contact closure is used in the 4-wire mode, jumper W1 shall be removed on
the master Audio Booster and installed on subsequent Audio Booster panels. If jumper W1 is
removed and an EOLR is not installed the TROUBLE LED D24 and the AUX TRB LED will be
lighted.
NOTE: 4 wire mode cannot be used when a SP4Z-A/B or SP4Z-APS audio splitter is installed on
the SP40/2.
SP40/2
UL Listed
10K Ohm
EOLR
ALARM
NO/COM
AUD OUT
UL Listed
10K Ohm
EOLR
UL Listed
10K Ohm
EOLR
Figure 3-2
MASTER
AUDIO
BOOSTER
Open
W1
Open
W10
SW1
AUX IN
CC
AUD IN
EXP OUT
AUD RET
AUDIO
BOOSTER
Closed
W1
Open
W10
AUD IN
SW1
AUD RET
NAC
AUX IN
AUX RET
AUDIO
BOOSTER
Closed
W1
Open
W10
AUD IN
SW1
AUD RET
NAC
AUX IN
AUX RET
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