Bosch CH70-24MCWH-FR, CH70-24MCWH-FW Specsheet

Fire Alarm Systems | CH70 High‑candela Chime Strobes

CH70 High‑candela Chime Strobes

www.boschsecurity.com

u Low current draw with temperature compensation

to reduce power consumption and wiring costs

u 24 VDC, filtered or FWR

u Adjustable volume and tone

These Wheelock CH70 High‑candela, Wall‑mount
Chime Strobes provide a low current draw, a choice of
single‑strike or vibrating operation, an adjustable
sound level, a chime tone adjustable from 800 Hz to
1200 Hz, and a choice of two high-intensity light
outputs (135 cd or 185 cd) in one unit. The strobes
can be synchronized using SM (single) or DSM (dual)
modules. They also have an attached mounting plate
for easy indoor installation on a variety of electrical
boxes.

Functions

Sound Mode Settings

The chimes are factory set in single-stroke mode. They
can be changed to vibrating mode before wiring by
moving a jumper.
Single‑Stroke Mode
The minimum input pulse duration must be at least
160 ms on and 160 ms off. The chime only operates
once each time it is pulsed. Use this mode for coded
systems.
Vibrating Mode
Continuous input voltage must be applied to the chime
to activate the chime at 1 sec intervals.

u Single‑stroke or vibrating tone

u Selectable strobe intensities of 135 cd or 185 cd

Strobe Settings

The unit comes set at 185 cd. Change the setting using
a screwdriver in the slot in the unit's base (setting is
visible on indicator plate within the lens).

Volume and Tone Settings

The volume and tone controls are factory set to ensure
maximum dBA output. The volume and tone can be
tuned to suit a particular application, but appropriate
measurements must be taken to ensure the volume
meets the listing requirements for private mode fire
protective service per UL464.

Certifications and approvals

Cooper Wheelock, Inc. holds these Listings and
Approvals:

Region

Certification

USA UL ULSZ: Audible Signal Appliances

(UL464), UUKC: Signaling Appliances
and Equipment for the Hearing Impaired
(UL1971)

CSFM see our website

2 | CH70 High‑candela Chime Strobes

Installation/configuration notes

Compatible Products

The following products are compatible with the CH70
Chime Strobes:

Category Product ID Product Description

Control

D7022

1

Conventional FACP

Panels

D7024

2

Addressable FACP

D7024 Conventional FACP

D8024

D9124

D10024A

FPD-7024

1

1

1

2

Analog FACP

Addressable FACP

Analog FACP

Addressable FACP

FPD-7024 Conventional FACP

FPA-1000 Analog Addressable FACPs

Modules SM‑12/24‑R Synchronization module (red)

DSM‑12/24‑R Dual synchronization module (red)

1

For synchronization, use the SM or DSM modules
with these control panels. The synchronization module
must be set for 24 V operation. When used, the D7022
must be set for 24 VDC operation.

2

When used with a D7039 Multiplex Expansion
Module, the FPD-7024 and D7024 become
addressable fire alarm control panels (FACPs).

Mounting Considerations

Mount these chime strobes on the indicated back
boxes for the indicated applications:

Conduit

Applications

Surface
Mounted

Flush Mounted

Four‑inch square* •

SBB Back Box • •

* Requires a four‑inch square back box that is 2.125 in
(5.4 cm) deep with a 1.5 in. (3.8 cm) deep extension
ring.

Wiring

The input terminals accept wires with diameters
between 18 AWG and 12 AWG (ISO 0.75 mm2 and
4 mm2).

Parts included

Quant. Component

1 Chime strobe

1 Hardware pack

1 Literature pack

Technical specifications

Electrical

Chime Current (maximum): 22 mA

Voltage (input) 24 VDC nominal, filtered or FWR

Strobe Current (maximum):

135 cd: VDC: 300 mA

FWR: 455 mA

185 cd: VDC: 420 mA

FWR: 645 mA

Environmental

Relative Humidity: Up to 85%, non‑condensing

Temperature (Operating): +32°F to +120°F (0°C to +49°C)

Mechanical

Candela Ratings: 135 cd or 185 cd

Dimensions (H x W x D): 5.1 in. x 5.1 in. x 5.2 in.

(13 cm x 13 cm x 13.3 cm)

Material: Molded plastic enclosure with Xenon

flashtube and Lexan lens

Chime Ratings at 24 VDC

Reverberant dBA at 10 ft (3 m) per
UL464:

Maximum: 58 dBA
Minimum: 52 dBA

Trademarks

All hardware and software product names used in this
document are likely to be registered trademarks and
must be treated accordingly.

Ordering information

CH70‑24MCWH‑FR High‑candela Chime Strobe (red)

Red, wall‑mount chime with adjustable volume and
single‑stroke or vibrating tone; strobe intensities of
135 cd or 185 cd

Order number CH70-24MCWH-FR

CH70‑24MCWH‑FW High‑candela Chime Strobe (white)

White, wall‑mount chime with adjustable volume and
single‑stroke or vibrating tone; strobe intensities of
135 cd or 185 cd

Order number CH70-24MCWH-FW

Accessories

ISP2‑R Surface Adapter (red)

13.3 cm (5.25 in.) square, 3 cm (1.1875 in.) deep

Order number ISP2-R

ISP2‑W Surface Adapter (white)

13.3 cm (5.25 in.) square, 3 cm (1.1875 in.) deep

Order number ISP2-W