273 Branchport Ave.
Long Branch, N.J. 07740 Thank you for using our products.
(800) 631-2148
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.
P84598 C
Sheet 1 of 7
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.
P84598 C
Sheet 2 of 7
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.
P84598 C
Sheet 3 of 7
OUT 1
PS-12/24-8
OUT 2
POWER BOOSTER
IN CLASS "A"
CONFIGURATION
RET 1
IN 1
UL LISTED
10K OHM
EOLR
OUT
RS-485
POWER
IN OUT
24 VDC
OUT
IN
ALARM
JP1
IN
NAC
Z1
NAC
CC
SW1
B
CLASS
A
SW2
Z2 Z3 Z4 EX1
SP4-APS
AUDIO
IN
DC
DC
AMP
SPKR
EX2
TROUBLE
5
624
3
1
0
10
SP=SVC
7
8
9
SETTINGS FOR BOTH SPLITTERS
SW1(NAC/CC) = NAC
SW2 (CLASS A/B) = B
OUTPUT AUDIO VOLTAGE
JP1 CLOSED = 70Vrms
OPEN = 25Vrms
TB1
SPB-80, SPB-160,
SPB-320 PC BOARD
L
AC
N
TB4
DC IN
DC OUT
BATTERY
TB5
AUD2 OUT
AUD1 OUT
STB2 OUT
STB1 OUT
TB6
EXP OUT
SPARE
C
T
NO
R
B
NC
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
DC
D10
UL LISTED
10K OHM
DC
EOLR
AMP
_
_
+
BAT
IN
TB1
AC
GRN
D11
AC
D9
BAT
D37
D13
SW1
SP40/2
+
TBL
YEL
24V
_
+
D14
STB
RED
TB2
TB3
STB OUT
STB IN
A
L
M
T
R
B
IN3
IN2
IN1
TB4
NR
TEL
BGM
TB5
AUDIO OUT
CC/NAC
AUX IN
TB6
RET
COM
COM
+
_
+
_
+
_
NO
NC
NO
NC
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
SPKR
DC
DC
AMP
SPKR
5
6
4
3
2
1
7
8
9
0
10
SP=SVC
UL LISTED
10K OHM
EOLR
Figure 5. Installation with SP40/2 ONLY.
CAUTION: This installation option will result in loss of alarm contact closure.
Refer to the following product manuals for additional wiring and installation information:
SP40/2 (P84116)
SPB-160 & SPB-80/4 (P84296)
SPB-320 (P84244)
SP4-APS (P84577)
SP4Z-A/B (P84205)
P84598 C
Sheet 5 of 7
MOUNTING INFORMATION:
Although the limits shown for each mounting option comply with the National Electrical Code (NEC), Wheelock recommends use of
the largest back box option shown and the use of approved stranded field wires, whenever possible, to provide additional wiring room
for easy installation and minimum stress on the product from wiring. The back box must be UL listed.
A B
EXTENSION RING
CAUTION: Check that the installed product will have sufficient clearance and wiring room prior to installing back boxes and
conduit, especially if sheathed multiconductor cable or 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”
extension ring and double gang ring (Figure B).
2. Conduit entrances to the back box should be selected to provide sufficient wiring clearance for the installed product.
3. When terminating field wires, do not use more lead length than required. Excess lead length could result in insufficient
wiring space for the appliance. Do not pass additional wires through the back box. Such additional wires could result in
insufficient wiring space for the device.
4. Verify that the SP-SVC is oriented correctly before wiring. Position the unit so that the number 5 is at the top.
5. The terminal block can accept 8 wires from #12 to #18 AWG with one wire per each position. Strip wires ¼ of an inch.
Insert the wires into the terminal block and turn the screws tightly to secure the wires. If using stranded wire, use care when
inserting the wires to ensure that the wires do not fray and cross with the other wires.
6. Carefully push the unit into the back box. Use care and proper techniques to position the field wires in the back box so that
they use minimum space and produce minimum stress on the product. If using rigid, heavy gauge wires, it may be necessary
to pre-bend the wires so that the unit can be easily pushed into the back box.
7. Insert the mounting screws through the holes in the cover plate and fasten them.
8. Verify correct installation by testing the unit and the system in background music mode and alarm mode.
ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER
DOCUMENTS DESCRIBING THE PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR
ANY OTHER USE, INCLUDING DESCRIPTION OF THE PRODUCT'S APPLICATION, OPERATION, INSTALLATION
AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK WILL NOT HAVE ANY LIABILITY
FOR SUCH USE.
P84598 C
Sheet 6 of 7
Limited Warranty
Wheelock products must be used within their published specifications and must be PROPERLY specified, applied, installed, operated,
maintained and operationally tested in accordance with these instructions at the time of installation and at least twice a year or more
often and in accordance with local, state and federal codes, regulations and laws. Specification, application, installation, operation,
maintenance and testing must be performed by qualified personnel for proper operation in accordance with all of the latest National
Fire Protection Association (NFPA), Underwriters' Laboratories (UL), Underwriters' Laboratories of Canada (ULC), National
Electrical Code (NEC), Occupational Safety and Health Administration (OSHA), local, state, county, province, district, federal and
other applicable building and fire standards, guidelines, regulations, laws and codes including, but not limited to, all appendices and
amendments and the requirements of the local authority having jurisdiction (AHJ). Wheelock products when properly specified,
applied, installed, operated, maintained and operationally tested as provided above are warranted against mechanical and electrical
defects for a period of three years from date of manufacture (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. THE FOREGOING LIMITED WARRANTY SPECIFICALLY
EXCLUDES ANY SOFTWARE REQUIRED FOR THE OPERATION OF OR INCLUDED IN A PRODUCT. WHEELOCK
MAKES NO REPRESENTATION OR WARRANTY OF ANY OTHER KIND, EXPRESS, IMPLIED OR STATUTORY
WHETHER AS TO MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR ANY OTHER MATTER.
USERS ARE SOLELY RESPONSIBLE FOR DETERMINING WHETHER A PRODUCT IS SUITABLE FOR THE USER'S
PURPOSES, OR WHETHER IT WILL ACHIEVE THE USER'S INTENDED RESULTS. THERE IS NO WARRANTY AGAINST
DAMAGE RESULTING FROM MISAPPLICATION, IMPROPER SPECIFICATION, ABUSE, ACCIDENT OR OTHER
OPERATING CONDITIONS BEYOND WHEELOCK'S CONTROL.
SOME WHEELOCK PRODUCTS CONTAIN SOFTWARE. WITH RESPECT TO THOSE PRODUCTS, WHEELOCK DOES
NOT WARRANTY THAT THE OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR-FREE OR
THAT THE SOFTWARE WILL MEET ANY OTHER STANDARD OF PERFORMANCE, OR THAT THE FUNCTIONS OR
PERFORMANCE OF THE SOFTWARE WILL MEET THE USER'S REQUIREMENTS. WHEELOCK SHALL NOT BE LIABLE
FOR ANY DELAYS, BREAKDOWNS, INTERRUPTIONS, LOSS, DESTRUCTION, ALTERATION, OR OTHER PROBLEMS
IN THE USE OF A PRODUCT ARISING OUT OF OR CAUSED BY THE SOFTWARE.
THE LIABILITY OF WHEELOCK ARISING OUT OF THE SUPPLYING OF A PRODUCT, OR ITS USE, WHETHER ON
WARRANTIES, NEGLIGENCE, OR OTHERWISE, SHALL NOT IN ANY CASE EXCEED THE COST OF CORRECTING
DEFECTS AS STATED IN THE LIMITED WARRANTY AND UPON EXPIRATION OF THE WARRANTY PERIOD ALL
SUCH LIABILITY SHALL TERMINATE. WHEELOCK IS NOT LIABLE FOR LABOR COSTS INCURRED IN REMOVAL,
REINSTALLATION OR REPAIR OF THE PRODUCT BY ANYONE OTHER THAN WHEELOCK OR FOR DAMAGE OF ANY
TYPE WHATSOEVER, INCLUDING BUT NOT LIMITED TO, LOSS OF PROFIT OR INCIDENTAL OR CONSEQUENTIAL
DAMAGES. THE FOREGOING SHALL CONSTITUTE THE SOLE REMEDY OF THE PURCHASER AND THE EXCLUSIVE
LIABILITY OF WHEELOCK.
IN NO CASE WILL WHEELOCK'S LIABILITY EXCEED THE PURCHASE PRICE PAID FOR A PRODUCT.
Limitation of Liability
WHEELOCK'S LIABILITY ON ANY CLAIM OF ANY KIND, INCLUDING NEGLIGENCE AND BREACH OF WARRANTY,
FOR ANY LOSS OR DAMAGE RESULTING FROM, ARISING OUT OF, OR CONNECTED WITH THIS CONTRACT, OR
FROM THE MANUFACTURE, SALE, DELIVERY, RESALE, REPAIR OR USE OF ANY PRODUCT COVERED BY THIS
ORDER SHALL BE LIMITED TO THE PRICE APPLICABLE TO THE PRODUCT OR PART THEREOF WHICH GIVES RISE
TO THE CLAIM. WHEELOCK'S LIABILITY ON ANY CLAIM OF ANY KIND SHALL CEASE IMMEDIATELY UPON THE
INSTALLATION IN THE PRODUCT OF ANY PART NOT FURNISHED BY WHEELOCK. IN NO EVENT SHALL
WHEELOCK BE LIABLE FOR ANY CLAIM OF ANY KIND UNLESS IT IS PROVEN THAT OUR PRODUCT WAS A
DIRECT CAUSE OF SUCH CLAIM. FURTHER, IN NO EVENT, INCLUDING IN THE CASE OF A CLAIM OF
NEGLIGENCE, SHALL WHEELOCK BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. SOME STATES
DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
PRECEDING LIMITATION MAY NOT APPLY TO ALL PURCHASERS.
3/05
P84598 C
Sheet 7 of 7
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