System Sensor CH24MC User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

SpectrAlert Selectable Output
CH24MC Series Wall Chime/Strobes
for Fire Protective Signaling Systems

For use with the following models: CH24MC and CH24MCW
U.S. Patent Nos. 5,931,569; 5.914,665; 5,850,178; 5,598,139; 6,049,446; 6,127,935; 6,133,843; 6,822,400; 6,856,241

Specifications: Chime

Mechanical

Input Terminals: 12 to 18 AWG (3.31 to 0.82 mm
Overall Dimensions: 6.9

Electrical

Voltages:

Operating Voltage Limits: 8–17.5 and 16–33
Maximum Operating Current
At 12VDC: 31 mA
At 24VDC: 61 mA
Operating Temperature: 32°F to 120°F (0°C to 49°C)
Sound Output: Sound output levels are established
at Underwriters Laboratories in their reverberant room. Always

Note for Strobes: Do not exceed 1) 16-33 Voltage range limit, 2) Maximum number of 70 strobe lights when connecting the MDL Sync module with a maximum line imped­ance of 4 Ohms per loop and 3) Maximum line impedance as required by the fire alarm control manufacturer.

NOTICE: This manual shall be left with the owner/user of this
equipment.

General Description

The SpectrAlert CH24MC series strobe can be installed in sys­tems using 24-volt panels having DC or full-wave rectified (FWR)
power supplies. The strobes can also be installed in applications
requiring synchronization (MDL required) or applications that do
not require synchronization (no module required). Please note
that the chime section is not synchronizable with the MDL.

The SpectrAlert CH24MC series chime/strobes are designed to
meet the requirements of most agencies governing these devices,
including: NFPA, ADA, The National Fire Alarm Code, UL. Also,
check with your local Authority Having Jurisdiction for other
codes or standards that may apply.

NOTE: The SpectrAlert CH24MC Series Chime/Strobe must

be powered from a non-coded power supply. This
appliance is not intended for use with a coded power
supply.

Fire Alarm Considerations

Temporal and Non-Temporal Coded Signals:

The American National Standards Institute and the National
Fire Alarm Code require that all horns used for building evacu­ation installed after July 1, 1996, must produce Temporal Coded
Signals. Signals other than those used for evacuation purposes do
not have to produce the Temporal Coded Signal.

Power Supply Considerations For Strobes

Panels typically supply DC filtered voltage or FWR (full-wave
rectified) voltage. The system design engineer must calculate the
number of units used in a zone based on the type of panel sup-

″ × 5.0″

Regulated 12 DC/FWR and
Regulated 24 DC/FWR

2

use the sound output specified as UL Reverberant Room when
comparing products.
Listings: UL S4011 Private Mode (Chime/

)

Specifications: Strobe

Voltage:
Operational Voltage Range: 16-33 Volts
Synchronous Applications
with MDL Module: 17-33 Volts
Flash Rate: 1 flash per second
Selectable Light Outputs: All candelas are selectable via a
manual slide switch. 15/75 is listed at 15 candela per UL 1971 but
will provide 75 candela on axis (straight ahead). 15, 30, 75, or 110
are rated for that candela.

ply. Be certain the sum of all the device currents does not exceed
the current capability of the panel. Calculations are based on
using the device current found in Table 3 and must be the current
specified for the type of panel power supply used.

Wire Sizes

The designer must be sure that the last device on the circuit has
sufficient voltage to operate the device within its rated voltage.
When calculating the voltage available to the last device, it is
necessary to consider the voltage drop due to the resistance of the
wire. The thicker the wire, the less the voltage drop. Generally, for
purposes of determining the wire size necessary for the system,
it is best to consider all of the devices as “lumped” on the end of
the supply circuit (simulates “worst case”).

Typical wire size resistance:

18 AWG solid: Approximately 8 ohms/1,000 ft.
16 AWG solid: Approximately 5 ohms/1,000 ft.
14 AWG solid: Approximately 3 ohms/1,000 ft.
12 AWG solid: Approximately 2 ohms/1,000 ft.

Example: Assume you have 10 devices on a zone and each
requires 50 mA average and 2000 Ft. of 14 AWG wiring (total
length=outgoing + return). The voltage at the end of the loop
is 0.050 amps per device × 10 devices × 3 ohms/1,000 ft. × 2000
ft =3 volts drop.

The same number of devices using 12 AWG wire will produce only
2 volts drop. The same devices using 18 AWG wire will produce
8 volts drop. Consult your panel manufacturer’s specifications, as
well as SpectrAlert’s operating voltage range to determine accept­able voltage drop.

Note: If class “A” wiring is installed, the wire length may be up to
4 times the single wire length in this calculation.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

Strobe), UL S5512 (Strobe)

Regulated 24 DC/FWR

D900-38-00 1 I56-2477-002R

Chime Selection

Repeating 1-Second Chime

Repeating 1/4-Second Chime

Temporal 3 Chime

Single Stroke Chime

Continuous 500Hz Electromechanical and 3kHz Electromechanical

Temporal 500Hz Electromechanical and 3kHz Electromechanical

Scale:
1 second

Chimes are factory set for high volume, 1.0K repeating 1 second
chime. Tones may be selected by making the appropriate settings
on the DIP Switch located on the printed circuit board. The set­tings required for the available tone options are as follows:

Table 1: SpectrAlert Chime Switch Settings

Switch 1=on 0=off

1 2 3 4 Hz Type

1 1 1 1 1.2k

Repeating 1-Second Chime1 0 1 1 1.0k
1 1 0 1 0.8k
1 0 0 1 1.2k

Repeating 1/4-Second Chime1 1 1 0 1.0k
1 0 1 0 0.8k
1 1 0 0 1.2k

Temporal 3 Chime1 0 0 0 1.0k
0 1 1 1 0.8k
0 0 1 1 1.2k

Single Stroke Chime0 1 0 1 1.0k
0 0 0 1 0.8k
0 1 1 0 3.0k Electromechanical Continuous
0 0 1 0 3.0k Electromechanical Temporal 3
0 1 0 0 0.5k Electromechanical Continuous
0 0 0 0 0.5k Electromechanical Temporal 3

Volume Switch

5 6

0 0 LOW
1 0 MED
1 1 HIGH

SpectrAlert Chime Tones

Table 2: SpectrAlert Electronic Chime Sound Output Guide

Tone

1.2K Repeating 1-Second Chime 51 52 55 53 54 56 57 61 52 59 61 64

1.0K Repeating 1-Second Chime 48 50 54 51 52 54 54 57 60 57 60 62

0.8K Repeating 1-Second Chime 47 47 53 49 51 52 53 55 58 55 58 60

1.2K Repeating 1/4-Second Chime 53 54 58 55 57 59 59 61 64 61 63 66

1.0K Repeating 1/4-Second Chime 49 50 54 51 53 54 55 57 60 57 59 62

0.8K Repeating 1/4-Second Chime 48 50 53 50 52 53 54 56 59 56 58 61

1.2K Temporal 3 Chime 51 52 56 52 54 55 55 57 61 58 60 63

1.0K Temporal 3 Chime 48 49 54 49 51 51 53 55 58 55 57 60

0.8K Temporal 3 Chime 46 47 51 48 50 51 52 54 57 54 56 59

1.2K Single Stroke Chime 52 53 58 52 54 56 56 58 62 58 60 64

1.0K Single Stroke Chime 47 48 53 50 51 59 53 55 58 56 58 62

0.8K Single Stroke Chime 47 48 53 49 50 52 54 56 60 56 59 61

3.0K Continuous Electromechanical 56 57 61 59 60 67 65 68 70 68 70 74

3.0K Temporal Electromechanical 51 52 56 53 54 61 56 59 62 58 60 64

0.5K Continuous Electromechanical 48 49 53 51 52 56 54 57 60 56 55 61

0.5K Temporal Electromechanical 45 47 51 47 49 53 51 52 58 52 54 60

NOTE: Factory default setting is 1.0K Repeating 1 Second Chime set at High volume.

Low Med. High Low Med. High Low Med. High Low Med. High

The chime section only tested at the 8-17.5 and 16-33 Volt-FWR/DC limits. This does not include the 80% low-end or 110%
high-end voltage limits.

Table 3: Strobe Current Draw Measurements

NOTE: All models were only tested at the 16-33 Volt-FWR/DC limits. This does not include the 80% low-end or 110% high-end voltage limits.

Model No. Candela Setting

CH24MC(W)
Chime/Strobe

15 64 59
15/75 74 69
30 93 90
75 158 160
110 208 209

SpectrAlert Electronic Chime Current Draw*

12VDC: 18–31mA
24VDC: 31–61mA

*Average current draw varies with tones selected. Current ratings per System Sensor testing at 12VDC and 24VDC. Add current values when connecting in parallel.

8 Volts 12 Volts 24 Volts 33 Volts

FWR Operating

Current–Strobe

(mA RMS)

DC Operating

Current–Strobe

(mA RMS)

D900-38-00 2 I56-2477-002R