Fire Alarm Systems | MB Motor Bells
MB Motor Bells
www.boschsecurity.com
u High sound output for improved alerting capabilities u High efficiency, low current motor
u Low starting voltage
u Fully enclosed mechanism
u Durable keyed steel gong and striker
These Wheelock motor bells use a high quality, micro motor operating mechanism. This provides longterm reliability, low starting voltage, and extremely low current consumption. These features enable the use of more bells per circuit and greater alarm signal distribution than conventional bells. The low starting voltage provides a stronger signal on marginal circuits. These motor bells eliminate the coils and contacts found in conventional vibratory bells. They contain a highly-efficient DC motor drive system to produce high sound pressure levels at lower current requirements. As a result, they reduce EMI generation problems.
The operating mechanism is enclosed in a die-cast aluminum housing, making the bells suitable for both interior and exterior applications. The steel gong and striker last longer and produce a louder sound output.
Certifications and approvals
Cooper Wheelock, Inc. holds these Listings and Approvals:
Region |
Certification |
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USA |
UL |
ULSZ: Audible Signal Appliances |
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(UL464) |
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FM |
MB Family |
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Region |
Certification |
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CSFM |
see our website |
Canada |
ULC |
ULSZC: Audible Signal Appliances and |
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Accessories, Fire Alarm |
Hong Kong |
HKFSD |
J-005/C/035 & J-005/C/038 |
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Installation/configuration notes
Compatible Products
The following products are compatible with the MB Motor Bells:
Categor |
Product ID |
Product Description |
y |
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Control |
Compatible with all Bosch G Series, 6000 Series, 2000 |
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Panels |
Series, DS7400Xi and DS7400XiV4, DS7080iP 32, |
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DS7200 Series, and DS7060 Series Control Panels1 |
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D70222 |
Conventional FACP |
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D70243 |
Addressable FACP |
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D7024 |
Conventional FACP |
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D80244 |
Analog FACP |
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D91244 |
Addressable FACP |
2 | MB Motor Bells
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D10024A4 |
Analog FACP |
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FPD-70243,5 |
Addressable FACP |
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FPD-70245 |
Conventional FACP |
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FPA-10005 |
Analog Addressable FACPs |
Modules |
SM 12/24 R |
Synchronization module (red) |
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DSM 12/24 R |
Dual synchronization module |
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(red) |
Strobes |
RSSP 241575W FR |
Fixed candela retrofit strobe plate |
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RSSP 24MCW FR |
Multi candela retrofit strobe plate |
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RSSP 24MCWH FR |
High candela retrofit strobe plate |
1 For synchronization, use the SM or DSM modules with these control panels and set the horns and synchronization module for 12 VDC operation.
2 The D7022 can be used in either 12 VDC or 24 VDC mode, but the synchronization module must be set for the same operating voltage as the control panel, and the bells must operate at the voltage supplied by the control panel.
3 When used with a D7039 Multiplex Expansion Module, the FPD-7024 and D7024 become addressable fire alarm control panels (FACPs).
4 For synchronization, use the SM or DSM modules with these control panels and set the synchronization module for 24 VDC operation, and use 24 VDC bells. 5 24 V motor bells only.
Current Rating
The peak current of all these motor bells is approximately four times the rated current. This peak current surge exists for about 6 ms and must be supplied by the system power supply to ensure start up of all devices. If the system power supply does not have sufficient surge capability (generally provided by large filter capacitors), base loading of the supply on the DC bell peak requirements rather than their rated current.
Mounting Considerations
Outdoor or Severe Environment Applications
For an outdoor application or a severe environment (NEMA 3R) application, these motor bells in combination with a WBB R Weather Resistant Back Box must be mounted on a flat wall such that the wall covers the entire rear surface of the back box. The back box must have its drain holes pointed toward the ground. The knockouts in the rear surface of the back box must remain intact.
The knockout hole on top of the back box is sized for a half inch. conduit and matching connector. Use a proper watertight conduit fitting.
Indoor Applications
For inside applications, mount these motor bells directly on the indicated back boxes for the indicated applications:
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Conduit |
Surface |
Semi Flush |
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Applications |
Mounted |
Mounted |
Four inch square |
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• |
• |
BB |
• |
• |
• |
DBB |
• |
• |
• |
SBB |
• |
• |
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SHBB |
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• |
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Use as Combination Appliance
Where combination appliances are required, these motor bells can be used with the RSSP 241575W FR (15/75 cd), RSSP 24MCW FR (15 cd, 30 cd, 75 cd, or 110 cd), or RSSP 24MCWH FR (135 cd or 185 cd) Retrofit Strobe Plates that are designed to meet or exceed the latest requirements of NFPA 72, ANSI 117.0 and UL 1971. The bells and retrofit strobe plates are also compatible with the SBL2 R Retrofit Device Back Box.
Wiring
These motor bells are polarized for use on supervised notification appliance circuits (NAC). All units are provided with four 6 in. (15.2 cm), 18 AWG (ISO
0.75 mm2) color coded leads to meet UL requirements and ensure correct polarity of notification appliance circuit wiring connections.
•Built in EMI suppression
•Mounting options include surface, flush, semi flush, and exterior
•Operates on filtered or unfiltered DC
Parts included
Quant. Component
1Motor bell
1Hardware pack
1Literature pack
Technical specifications
Electrical
Current (maximum) at 8 VDC to 17.5 VDC
VDC: |
90 mA |
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VFWR: |
110 mA |
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Current (maximum) at 16 VDC to 33 VDC |
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VDC: |
40 mA |
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VFWR: |
56 mA |
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Environmental |
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Relative Humidity: |
Up to 85% |
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Temperature (Operating): |
-31°F to +151°F (-35°C to +66°C) |
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