P84577 G
Sheet 2 of 14
2.1 WIRING
SPECIFICATIONS:
Cable Size: All terminal blocks accept #12 - #18 American Wire Gauge (AWG) for single wire connection.
3.0 WIRING INSTRUCTIONS:
NOTE:
The terminal blocks on the SP4-APS
are removable. To remove a terminal block, pull the block straight up from the
circuit board as shown in Figure 1. Attach wires to the desired connections, then plug the terminal block back on the board
being careful to match and align the pins.
Figure 1: Removable Terminal Block
Figure 2 shows the PC board layout with the locations of all terminal blocks.
OUT
IN
OUT
IN
OUT
IN
24 VDC
AUDIO
RS-485
ALARM
POWER
TROUBLE
Z1
Z2
Z3
Z4
EX1 EX2
IN
CLASS
B
A
SW
2
SP4-APS
JP
1
NAC
CC
SW1
TB1
TB2
TB7
TB6
TB5
TB4
TB3
JP1
Shorted = 70Vrms
Open = 25Vrms
D3
7
D3
2
D3
6
D3
5
D4
1
D3
3
D4
2
D4
3
D3
8
D3
4
D3
9
D4
0
D44
D45
Figure 2: SP4-APS PC Board
Terminals for the RS-485 connections are used with the SP4-TZC and are explained in the SP4-TZC installation instructions.
3.1 Audio Zone Output Wiring
The SP4-APS can be configured for either “CLASS A” or “CLASS B”. It cannot do both at the same time. The maximum
audio power output on any zone is 40 watts. Expansion (EX1, EX2) terminals follow the Class A or B setting that applies to
all zones.
Instead of speakers, up to four SPB-160 or SPB-80/4 (or two SPB-320) Audio Boosters may be connected to an audio output
zone, provided that nothing else is on that zone. The total number of Audio Boosters combined shall not exceed 33.
NOTE
: Factory setting is for Class B Wiring.
3.1.1 “CLASS A” Audio Wiring:
When an installation requires “CLASS A” audio field wiring on the SP4-APS module, the Class Selector Switch (SW2)
must be set for “CLASS A”.
Note that no end-of-line resistors (UL Listed 10K Ohm, EOLR) are used on any of
the SP4-APS module audio output zones as shown in Figure 3
. Zones Z1 and Z2 are connected in Class A
configuration as well as Z3 and Z4. Figure 3 shows the SP4-APS with SW2 and the audio field wiring set for “CLASS
A”.
The audio zone outputs are either 25Vrms or 70.7Vrms matching the audio input voltage. Remember, the SP40/2 has a
maximum audio output to the splitter of 40 watts, while the Audio Boosters have a maximum audio output to the splitter
of 80 watts.
