Instruction manual
P84598 C
Sheet 1 of 7
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Long Branch, N.J. 07740 Thank you for using our products.
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www.wheelockinc.com
INSTALLATION INSTRUCTIONS
SP-SVC SAFEPATH SUPERVISED VOLUME CONTROL
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 . 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.