Wheelock STH-2 MSR Installation Instructions

273 Branchport Avenue
Long Branch, N.J. 07740
(800) 631-2148 – U.S.A.
www.wheelockinc. com
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
MODELS:
STH-2 MSR
STH-3 MSR
STH-4 MSR
STH-2R
STH-3R
STH-4R
NOTE:
- The STH-2R, STH-3R and STH-4R do not have a DC-MAX-C strobe.
- All references to the STH-2MSR, STH-3MSR and STH-4MSR apply to the STH-2R, STH-3R and STH-4R, except for any
reference to the DC-MAX-C.

GENERAL:

The series STH-MSR Cluster Speaker Assembly is designed for ceiling or wall mounting in high ambient noise level environments.
The Series STH-MSR Cluster Speakers are a speaker/visual alerting system, equipped with UL Listed STH-15SR supervised horn
loudspeakers, and a UL Listed DC-MAX-C Strobe, mounted to a galvanized steel enclosure, 10"W X 10"L X 6"D. Speakers and
Strobe are pre-wired to the internal terminal block. Each speaker can be wired for single or multiple speaker circuit operation.
The STH-15SR loudspeaker provides multiple power requirements with high dBA output at each power tap. STH models offer a
choice of field selectable taps, 1 to 15 Watts for either 25VRMS or 70VRMS audio systems. The Series STH design incorporates a
compression driver, mounted on a double re-entrant horn for maximum output at minimum power across a UL rated frequency range
of 400 to 4,000Hz and an anechoic range of 400 to 14,000Hz. The speaker line inputs are compatible with standard supervision of
circuit wiring by a Voice Control Panel. A capacitor is wired in series with the multi-tap transformer for this purpose. Each
loudspeaker meets or exceeds the UL listed standards for audible signal appliances and is capable of operating within the ambient
temperature range of 66º C (150º F) to -35ºC (-30ºF). This unit complies with UL Standard 1480 (Speakers for Fire Protective
Signaling Systems). Additional information is available from the Installation Sheet P82697.
The DC-MAX-C strobe is a 5 inch tall, 6.2 inch diameter, cylindrical strobe light. The DC-MAX-C strobe provides a highly visible,
clear lens, 100 candela and 60 double flashes per minute that can be seen in all directions. It operates on all standard voltages from
10.5VDC to 31.0VDC. The strobe appliance contains a blocking diode that allows this device to be supervised using standard reverse
polarity. The DC-MAX-C strobe complies with UL Standard 1638 and is capable of operating within the ambient temperature range
of 66ºC (150º F) to -35ºC (-30ºF). Additional information is available from the Installation Sheet P83857.
NOTE : All CAUTIONS and
WARNING: 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, SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.

SPECIFICATIONS (SPEAKER):

Each speaker has a slotted rotating switch used to change the dB setting for the output. Table 1 shows the settings and the outputs.
Setting
1
2
3
4
5
6
7
Copyright 2001 Wheelock, Inc. All rights reserved.
Thank you for using our products.
INSTALLATION INSTRUCTIONS
SERIES STH MSR CLUSTER SPEAKER ASSEMBLY
Red 2-STH-15SR UL Listed under UL 1480 for Speaker Appliances and 1-DC-MAX-C
UL Listed under UL-1638 for strobe appliances.
Red 3-STH-15SR UL Listed under UL 1480 for Speaker Appliances and 1-DC-MAX-C
UL Listed under UL-1638 for strobe appliances.
Red 4-STH-15SR UL Listed under UL 1480 for Speaker Appliances and 1-DC-MAX-C
UL Listed under UL-1638 for strobe appliances.
Red 2STH-15SR UL listed under 1480 for Speaker Appliances.
Red 3STH-15SR UL listed under 1480 for Speaker Appliances.
Red 4STH-15SR UL listed under 1480 for Speaker Appliances.
are identified by the symbol
WARNINGS
Table 1: Wattage Selector Switch Settings and dBA
dB
96
96
99
102
Not Used
Not Used Not Used
Not Used Not Used
. All warnings are printed in bold capital letters.
70V dB
0.9W 93
1.8W 96
3.8W 96
7.5W 99
15.0W 102
Not Used
Not Used
25V dB
Not Used Not Used
Not Used Not Used
0.48W 90
0.94W 90
1.8W 93
7.5W 99
15.0W 102
P83966 C
Sheet 1 of 4