wheelock STH-2 MSR, STH-3 MSR, STH-4 MSR, STH-2R, STH-3R INSTALLATION INSTRUCTIONS

273 Branchport Avenue
Long Branch, N.J. 07740 Thank you for using our products.
[phone] – U.S.A.
www.wheelockinc. com

SERIES STH MSR CLUSTER SPEAKER ASSEMBLY

INSTALLATION INSTRUCTIONS

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

MODELS:

STH-2 MSR 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.

STH-3 MSR 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.

STH-4 MSR 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.
STH-2R Red 2STH-15SR UL listed under 1480 for Speaker Appliances.
STH-3R Red 3STH-15SR UL listed under 1480 for Speaker Appliances.
STH-4R Red 4STH-15SR UL listed under 1480 for Speaker Appliances.

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

WARNINGS

are identified by the symbol . All warnings are printed in bold capital letters.

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.

Table 1: Wattage Selector Switch Settings and dBA

Setting dB 70V dB 25V dB

1 96 0.9W 93 Not Used Not Used
2 96 1.8W 96 Not Used Not Used
3 99 3.8W 96 0.48W 90
4 102 7.5W 99 0.94W 90
5 Not Used 15.0W 102 1.8W 93
6 Not Used Not Used Not Used 7.5W 99
7 Not Used Not Used Not Used 15.0W 102

Copyright 2001 Wheelock, Inc. All rights reserved.

P83966 C

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WARNING: WHEELOCK STRONGLY RECOMMENDS THAT THE VOLTAGE APPLIED TO THESE PRODUCTS
BE WITHIN THEIR RATED INPUT VOLTAGE RANGE. THE APPLICATION OF IMPROPER VOLTAGE MAY
RESULT IN DEGRADED OPERATION OR DAMAGE TO THESE PRODUCTS, WHICH COULD RESULT IN
PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.

NOTES:

1. Power Handling Capacity (RMS): 15W

2. Sound Dispersion: 70 Degrees

3. Constant Voltage Line: 25Vrms or 70Vrms

4. Frequency Response: UL rated at 400 - 4,000Hz (@ Full Rated Output), Anechoic 400 – 14,000 Hz.

5. Sound Level (Peak): 120dB @ 15W, 1 Meter

6. Dimensions: 7-7/8W X 8-3/4H X 9-5/16L

CAUTION: Do not place switch in settings marked "not used". Failure to comply with these restrictions may cause damage to
components and will void the warranty.

STROBE:

Table 2A: Rating Per UL

Model

Code

Lens

Color

Rated

Voltage

Input

Current

Flash

Rate

Typ. Eff.

Candela

DC-MAX-C Clear 10.5 to 31.0 VDC See Table 2b 60/Min Typical 100cd

Table 2B: DC-MAX-C Input Current Versus Input Voltage

Voltage (VDC) 12 24
Current (mA) 1010 470

NOTES:

1. Temperature range for all models is -30°F to +150°F (-35°C to +66°C)

2. Flash energy and flash rate are specified for double flash operation.

3. Effective candela is measured per IES specifications.

INSTALLATION INSTRUCTIONS:

SPEAKER WATTAGE SELECTOR SWITCH SETTING:

1. Remove the cable entrance interface adaptor and gasket. (See Installation Sheet P82697)

2. Adjust the Speaker Wattage Selector Switch for the desired dB and wattage setting (Table 1) for each speaker.

3. Replace the cable entrance interface adaptor and gasket.

APPLICATION NOTES:

1. Loosen the 4 Phillips screws holding the cover plate and MAX-DC-C Strobe to the enclosure box. (Figure 1)

2. Remove the cover plate and MAX-DC-C Strobe.

Figure 1: Phillips Screw Location

PHILLIPS SCREWS-4X

3. Mount the speaker assembly to the desired location.

4. Punch out desired knockouts and attach conduit and fittings.

COVER PLATE AND STROBE

P83966 C

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