NOTICE:
w
DO NOT USE LOOPED WIRE UNDER TERMINALS. BREAK WIRE RUN TO
PROVIDE SUPERVISION OF CONNECTION.
w
VOLTAGE SUPPLIED TO SIGNAL WHEN THE PANEL IS LATCHED.
w
NFPA 72 REQUIRES THAT AN AUDIBLE SIGNAL APPLIANCE THAT EMITS A
CONTINUOUS SIGNAL WHILE ENERGIZED HAVE A TEMPORAL PATTERN
IMPOSED ON IT IF THE ALARM SIGNAL IS INTENDED TO EVACUATE THE
BUILDING.
w
TO SYNCHRONIZE THE MHT-1224, USE THE AVSM CONTROL MODULE.
4. Install the MHT-1224 unit to the mounted rough-in box.
5. Secure the unit to the box using the two mounting screws (supplied).
CAUTION:
When installing, route field wiring away from sharp projections, corners, and
internal components.
6. The MHT-1224 is a temporal 3 or continuous tone unit. The device is factory set
in temporal 3 mode. To enable continuous tone, break jumper on back of unit as
shown in DIAGRAM 2.
NOTICE:
ONCE JUMPER HAS BEEN BROKEN, THE OPTION TO REVERT FROM
CONTINUOUS TO TEMPORAL 3 TONE IS NOT POSSIBLE. DO NOT BREAK JUMPER
IF TEMPORAL 3 TONE IS NEEDED.
This appliance will not operate without electrical power. As fires
frequently cause power interruptions, we suggest you discuss further
safeguards with your local fire protection specialist.
VI. ELECTRICAL SPECIFICATIONS
IV. CHECKOUT AND TROUBLESHOOTING
1. Supply power to the system control panel. The auxiliary alarms in the system should
not alarm.
2. If alarm is heard:
a. Check all smoke and fire detection units in the system to make sure that they have
not been activated.
b. Check all wiring connections to make sure detection circuits are not reversed or
shorted together.
3. To test the auxiliary alarms circuit, trip the alarm circuit at the main control panel or
activate one of the fire detection units in the system. All auxiliary alarms should be
activated.
4. Always perform an operational test on this product on a regular basis after installation.
Potter Electric suggests that this regularly scheduled testing be performed at least twice
a year, or more often as may be dictated by the local authorities having jurisdiction.
NOTICE
: THESE TESTING AND TROUBLESHOOTING INSTRUCTIONS ARE
GENERALIZED. PLEASE REFER TO THE SYSTEM CONTROL PANEL OPERATING
INSTRUCTIONS FOR PROPER OPERATION OF THE PANEL AND FIRE DETECTION
SYSTEM.
NOTICE:
w
DC VOLTAGE RANGE LIMITS: 8-17.5V AND 16-33V. FWR VOLTAGE RANGE LIMITS:
8-17.5V AND 16-33V. THIS PRODUCT WAS ONLY TESTED TO THE STATED
VOLTAGE RANGE(S); DO NOT APPLY 80% AND 110% OF THIS RANGE FOR
SYSTEM OPERATION.
w
THE THREE PULSE TEMPORAL PATTERN IS TO BE USED FOR EVACUATION USE
ONLY.
w
THE SOUND OUTPUT FOR THE TEMPORAL 3 TONE IS RATED LOWER SINCE THE
TIME THE HORN IS OFF IS AVERAGED INTO THE SOUND OUTPUT RATING.
WHILE THE HORN IS PRODUCING A TONE IN THE TEMPORAL 3 MODE ITS
SOUND PRESSURE IS THE SAME AS THE CONTINUOUS MODE. UNITS HAVE
BEEN TESTED TO 0°C, 49°C AND 93% HUMIDITY.
I. INTRODUCTION
The Potter Electric MHT-1224 is a high-quality, remote, audible signaling appliance rated a
minimum of 75-85dBA at 10 feet. This appliance is ideal for applications where a
dependable alarm signal is required in hotels, dormitories, apartments, and other
installations.
II. LOCATION
The appliance is intended for use in fire protective signaling systems and is to be installed
in accordance with the applicable requirements of NFPA 72 and the local authorities having
jurisdiction. The MHT-1224 is intended for indoor installation only. This appliance is
not
listed for outdoor applications.
III. INSTALLATION AND WIRING
Unit Dimensions:
2.84” Wide X 4.48” High X 0.5” Deep
MOUNTING BOXES
Handy Box:
4" x 2-1/8" (approx.)
Switch Box:
3" x 2" (approx.) with conduit knockouts
Masonry Box:
3-3/4" x 2"(approx.) with ½" and ¾" concentric knockouts
Non-Metallic Switch Box: 3-3/4" x 2-5/16" (approx.)
NOTICE
: A MOUNTING BOX MUST BE INSTALLED FOR EACH REMOTE
SIGNALING APPLIANCE.
WIRE CONNECTIONS
1. The MHT-1224 has two terminals for power-in and power-out supply circuits.
2. Make the wire connections as follows: Positive to the (+) terminal and negative to
the (-) terminal.
3. Run a minimum 18-gauge insulated conductor from the signaling appliance in the
system. Use ANSI/UL Listed Class 1 wire.
Use screwdriver to
break jumper for
continuous tone.
DO NOT BREAK
JUMPER IF
TEMPORAL 3
TONE IS NEEDED.
DIAGRAM 1
DIAGRAM 2
MHT-1224 SERIES
ANSI/UL & CAN/ULC COMPLIANT
ADDITIONAL CAN/ULC LISTED PRODUCT INFORMATION IS FOUND ON PAGE 2
12/24VDC REMOTE AUDIBLE
SIGNALING APPLIANCE
MHT-1224 HORN DECIBEL RATINGS: REVERBERANT ROOM
Horn Mode
Minimum SPL @
10Ft. Per
ANSI/UL464 @ 24VDC
Minimum SPL @
10Ft. Per
ANSI/UL464 @ 12VDC
Temporal 3 Tone
81 dBA
78 dBA
Continuous Tone
86 dBA
83 dBA
HORN RATINGS OVER INPUT
VOLTAGE RANGE OF 16-33V
HORN RATINGS OVER INPUT
VOLTAGE RANGE OF 8-17.5V
Regulated
24VDC Max.
Operating (mA)
Regulated
24VFWR Max.
Operating (mA)
Regulated
12VDC Max.
Operating (mA)
Regulated
12VFWR Max.
Operating (mA)
Temporal 3
18
20
13
17
Continuous
21.1
20.7
7
10
firealarmresources.com
