P81960 J
Sheet 1 of 4
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Long Branch, N.J. 07740
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INSTALLATION INSTRUCTIONS
SERIES MB BELLS
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
GENERAL:
Series MB Motor Bells are UL Listed for Fire Protective Service with the exception of the 6VDC Motor Bell which is UL approved
for general signaling use. The Motor Bell Series incorporates a high torque permanent magnet motor to provide high output with
minimum current draw. Integral MOV suppression is provided to minimize RFI and turn-off transients. In-out wiring terminals and a
built-in trim plate, for semi-flush mounting, are provided for easy installation. The Motor Bell Series is available in 6VDC with a 6"
bell shell and 12VDC or 24VDC with either a 6" or 10" bell shell.
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: UL Listed Models and Ratings
Maximum RMS Current Draw Reverberant dBA Per UL 464 Mounting
Model Gong Size
Voltage Range
(VDC/VRMS)
DC FWR Min Nom Max Options
MB-G6-6 6" 4.2-7.8 0.130 0.160 75 82 85 A,B,C,D
MB-G6-12 6" 8.0-17.5 0.090 0.110 79 85 88 A,B,C,D
MB-G10-12 10" 8.0-17.5 0.090 0.110 82 88 91 A,B,C,D
MB-G6-24 6" 16.0-33.0 0.040 0.056 82 85 88 A,B,C,D
MB-G10-24 10" 16.0-33.0 0.040 0.056 82 88 91 A,B,C,D
WARNING: FOR UL APPLICATIONS THESE APPLIANCES WERE TESTED TO THE OPERATING VOLTAGE
LIMITS OF 16-33 VOLTS FOR 24V MODELS, 8-17.5V FOR 12V MODELS, OR 4.2-7.8V FOR 6V MODELS USING
FILTERED (DC) OR UNFILTERED FULL-WAVE-RECTIFIED (FWR). DO NOT APPLY 80% AND 110% OF THESE
VOLTAGE VALUES FOR SYSTEM OPERATION.
WARNING: MAKE SURE THAT THE TOTAL RMS CURRENT REQUIRED BY ALL APPLIANCES THAT ARE CONNECTED
TO THE SYSTEM’S PRIMARY AND SECONDARY POWER SOURCES, NAC CIRCUITS, SM, DSM SYNC MODULES OR
WHEELOCKS POWER SUPPLIES DO NOT EXCEED THE POWER SOURCES’ RATED CAPACITY OR THE CURRENT RATINGS
OF ANY FUSES ON THE CIRCUITS TO WHICH THESE APPLIANCES ARE WIRED. OVERLOADING POWER SOURCES OR
EXCEEDING FUSE RATINGS COULD RESULT IN LOSS OF POWER AND FAILURE TO ALERT OCCUPANTS DURING AN
EMERGENCY, WHICH COULD RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR
OTHERS.
When calculating the total currents: Use Table 1 to determine the highest value of “RMS Current” for an individual bell (across the
expected operating voltage range of the bell), then multiply these values by the total number of bells; be sure to add the currents for
any other appliances, including audible signaling appliances, powered by the same source and include any required safety factors.
If the peak current exceeds the power supplies’ peak capacity, the output voltage provided by the power supplies may drop below the
listed voltage range of the appliances connected to the supply and the voltage may not recover in some types of power supplies. For
example, an auxiliary power supply that lacks filtering at its output stage (either via lack of capacitance and/or lack of battery backup
across the output) may exhibit this characteristic.
Copyright 2004 Wheelock, Inc. All rights reserved.
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