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273 Branchport Ave.
Long Branch, N.J. 07740
(800) 631-2148
www.wheelockinc.com
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
GENERAL:
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
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:
Copyright 2005 Wheelock, Inc. All rights reserved.
Thank you for using our products.
INSTALLATION INSTRUCTIONS
SP-SVC SAFEPATH SUPERVISED VOLUME CONTROL
Table 1: Attenuation Rating
Switch
Position
Position
Attenuation (dB)
10
0
9
-4
8
-3
7
-3
6
-3
5
-3
4
-3
3
-3
2
-3
1
-3
0
OFF
Insertion loss is less than 0.5 dB.
Table 2: Audio Power Rating
Audio Input Voltage
70.7 VRMS
25.0 VRMS
Table 3: DC input ratings
Input voltage
16.0-33.0 VDC/VRMS
. All warnings are printed in bold capital letters.
Total
Attenuation (dB) (Approx.)
0
-4
-7
-10
-13
-16
-19
-22
-25
-28
OFF
Maximum Load
35W
4W
Maximum RMS Current
10.0 mA
P84598 C
Sheet 1 of 7
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Table of Contents
Summary of Contents for Wheelock SP-SVC
- Page 1 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.
- Page 2 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.
- Page 3 UL LISTED SP=SVC 10K OHM UL LISTED EOLR 10K OHM EOLR UL LISTED SP=SVC 10K OHM EOLR TO AUDIO SPEAKERS AND/OR UL LISTED 10K OHM EOLR 24VDC POWER SP4Z-A/B TROUBLE SPB-80, SPB-160, SPB-320 PC BOARD DC IN DC OUT BATTERY AUD2 OUT The 24VDC and EXP OUT wiring is Non-Power Limited.
- Page 4 AUD1 OUT STB2 OUT STB1 OUT EXP OUT SPARE SPB-160 WITH TWO SP4-APS SPLITTERS Figure 4. Class A system wiring diagram. SP4-APS Splitter is required. SP-SVC DC input must be connected to class A NAC. P84598 C Sheet 4 of 7...
- Page 5 UL LISTED 10K OHM EOLR STB OUT STB IN SP=SVC UL LISTED 10K OHM EOLR AUDIO OUT SP40/2 CC/NAC AUX IN Figure 5. Installation with SP40/2 ONLY. : This installation option will result in loss of alarm contact closure. CAUTION Refer to the following product manuals for additional wiring and installation information: SP40/2 (P84116)
- Page 6 3/4" conduit fittings are used. 1. The SP-SVC can be mounted to a 3 ½” deep double gang box (Figure A) or a 4” inch square, 1 ½” deep box with a 1 ½”...
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Page 7: Limited Warranty
(as determined by date code). Correction of defects by repair or replacement shall be at Wheelock's sole discretion and shall constitute fulfillment of all obligations under this warranty. THE FOREGOING LIMITED WARRANTY SHALL IMMEDIATELY TERMINATE IN THE EVENT ANY PART NOT FURNISHED BY WHEELOCK IS INSTALLED IN THE PRODUCT.
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