wheelock SP-SVC INSTALLATION INSTRUCTIONS

273 Branchport Ave.
Long Branch, N.J. 07740 Thank you for using our products.
[phone]
www.wheelockinc.com

INSTALLATION INSTRUCTIONS

GENERAL:

Use this product according to this instruction manual. Please keep this instruction manual for future reference.

SP-SVC SAFEPATH SUPERVISED VOLUME CONTROL

The SP-SVC Supervised Volume Control is a 35 watt volume attenuator that is listed under UL864 for installation with the Safepath
SP40/2 along with the SPB-160, SPB-80/4, or SPB-320. It can be used to control the volume of a single speaker, multiple speakers or
an entire audio loop up to 35 watts. The SP-SVC contains an override relay that will bypass the attenuator when the system is put into
an alarm condition, thereby allowing the emergency notification message(s) to be announced at the maximum volume. The SP-SVC
is designed to be compatible with a UL864 listed 24 volt supervised notification appliance circuit (NAC). It is compatible with class
B wiring and with class A wiring if used with the SP4-APS Addressable Paging Splitter.

NOTE: This model is recommended for use with 70.7VRMS supervised audio systems, but it can be used in 25.0VRMS systems if
the speaker load is reduced to 4 watts.

NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All warnings are printed in bold capital letters.

WARNING: PLEASE READ THESE INSTRUCTIONS CAREFULLY. FAILURE TO COMPLY WITH ANY OF THE
FOLLOWING INSTRUCTIONS, CAUTIONS AND WARNINGS COULD RESULT IN IMPROPER APPLICATION,
INSTALLATION AND/OR OPERATION OF THESE PRODUCTS IN AN EMERGENCY SITUATION, WHICH COULD
RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.

SPECIFICATIONS:

Table 1: Attenuation Rating

Switch

Position

Position

Attenuation (dB)

Total

Attenuation (dB) (Approx.)

10 0 0

9 -4 -4
8 -3 -7
7 -3 -10
6 -3 -13
5 -3 -16
4 -3 -19
3 -3 -22
2 -3 -25
1 -3 -28
0 OFF OFF

Insertion loss is less than 0.5 dB.

Table 2: Audio Power Rating

Audio Input Voltage Maximum Load

70.7 VRMS 35W

25.0 VRMS 4W

Table 3: DC input ratings

Input voltage Maximum RMS Current

16.0-33.0 VDC/VRMS 10.0 mA

Copyright 2005 Wheelock, Inc. All rights reserved.

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WIRING INFORMATION:

DC

FROM PRECEDING APPLIANCE
OR NAC OUTPUT

SP40/2

ALM
NO - COM

DC

AMP

SPKR

AUDIO

TO NEXT APPLIANCE OR EOLR

FROM AUDIO OUTPUT OR
PRECEDING SPEAKER

TO NEXT SPEAKER

Figure 1. Terminal Block wiring diagram.

AUDIO

AUDIO

AUDIO

NAC
IN

AUDIO

SPLITTER

SPB
AUDIO
BOOSTER

EXP OUT

AUX IN

NAC
IN

NAC
OUT

NAC
IN

NAC
OUT

NAC
IN

NAC
OUT

NAC
OUT

5

624

3

1

0

10

SP-SVC

5

624

3

1

0

10

SP-SVC

5

624

3

1

0

10

SP-SVC

5

624

3

1

0

10

SP-SVC

7

8

9

7

8

9

7

8

9

7

8

9

Figure 2. Typical system layout with SP40/2 and SPB Audio Booster and optional splitter.

NOTES:

1. Only one SP-SVC can be installed per audio zone; however, multiple units can be controlled by the same NAC.

2. All fixed volume speakers must be placed before

the SP-SVC in the audio circuit. Any speakers placed after the unit will be

able to be attenuated.

3. If the SP-SVC is installed in a supervised audio system with class B wiring, then an end-of-line resistor (EOLR) must be

installed on the last speaker connected to the volume control unit.

4. Attach wires according to the label on the terminal block. The DC input/output terminals are interchangeable. If the SP-

SVC is the last unit on the NAC, then an end-of-line resistor must be installed.

5. The maximum wire impedance between devices shall not exceed 35 ohms.

CAUTION: The SP-SVC is not designed to be used on coded systems in which the applied voltage is cycled on and off.

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DC

DC

AMP

SPKR

5

UL LISTED
10K OHM
EOLR

DC

DC

AMP

SPKR

DC

DC

AMP

SPKR

624

3

1

9

0

10

SP=SVC

5

624

3

1

9

0

10

SP=SVC

7

8

UL LISTED
10K OHM
EOLR

7

8

UL LISTED
10K OHM
EOLR

TO AUDIO SPEAKERS AND/OR
UL LISTED 10K OHM EOLR

POWER

TROUBLE

SPB-80, SPB-160,
SPB-320 PC BOARD

The 24VDC and EXP OUT wiring
is Non-Power Limited. Run these
wires at least 1/4" from Power
Limited wiring and 1/4" above the
PC Board.

-

-

+

+

AUD

Z1

IN

24VDC

-

+

SP4Z-A/B

-

-

Z3 Z4

L

AC

N

DC IN

DC OUT

BATTERY

AUD2 OUT

AUD1 OUT

STB2 OUT

STB1 OUT

EXP OUT

SPARE

C

NO

NC

-

+

+

T
R
B

+

Z2

TB1

TB4

TB5

TB6

SPB-160 WITH TWO
SP4-APS SPLITTERS

Figure 3. Class B system wiring diagram. SP4Z-A/B splitter is optional.

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