POTTER LFHS Series Low Frequency Horn-Strobe Owner’s Manual
- June 9, 2024
- POTTER
Table of Contents
LFHS Series
Low Frequency Horn/Strobe
Features
- High quality, low profile, low frequency audible and visible appliance
- Produces a 520 Hz square wave, temporal 3 tone
- Fixed candela options: 15, 110, and 177
- Jumper Selection for normal or loud dBA
- Input terminals accept 12 to 18 AWG
- Super-Slide® Bracket – Ease of Supervision Testing
- Checkmate® – Instant Voltage Verification
- Temporal 4 pattern available when used with compatible panels
- Prewire entire system, install mounting bracket, then install signals
- Silence signal while visual appliance will remain flashing (for use in accepted jurisdictions.
- Faceplate available in red or off-white
- Wall mount
- Five year warranty
Description
The LFHS is a high quality, low profile, low frequency audible and visible
appliance that offers a dependable audible and visual alarm. The LFHS is ideal
for any occupancy that requires low frequency notification appliances. The
LFHS horn offers a 520 Hz square wave, temporal 3 tone. A jumper selection is
available for normal or loud decibel tone. The LFHS is available in a fixed
15, 110 and 177 candela strobe. A temporal 4 pattern is available when used
with compatible panels or GTSM sync module. The LFHS is available in a fixed
15, 110, or 177 candela strobe.
The LFHS is shipped with a standard 4” metal mounting plate which incorporates
the Super-Slide® feature that allows installers to easily test for
supervision. The product also features a locking mechanism which secures the
product to the bracket without any screws showing.
The LFHS also features the patented Checkmate – Instant Voltage V erification
feature which allows the installer to check the voltage drop and match it to
the blueprint.
The LFHS series appliances are ANSI/UL 464 and ANSI/ UL 1971 listed for use
with fire protective systems and are warranted for five years from date of
purchase.
Technical Specifications
| Mounting Options | Single or Double gang, or 4″ square box |
|---|---|
| Terminals | Screw-clamp Type |
| Wire Gauge | 12 to 18 AWG |
| Operating Voltage | 24 VDC |
| Operating Temperature Range | 32°F to 120°F |
| Dimensions | Height – 6.5″ Width – 5.5″ Depth – 2″ |
Checkmate® Instant Voltage Verification
It is often necessary to confirm the voltage drop along a line of devices. The
access holes are provided in the back of the terminal block to allow the
voltage to be measured directly without removing the device. Typically this
would be done at the end of the line to confirm design criteria. Most
measurements will be taken using the S+ And S- locations although access is
provided to other locations.
Notice: Care should be taken to not short the test probes.
Super Slide® Mounting Bracket
Allows the installer to pre-wire the system, test for system supervision,
remove the signal head until occupancy, switch out signals without changing
mounting brackets and has locking edge connector for snapin-place installation
To remove bezel, squeeze top and bottom of bezel until bezel releases from bracket
Ordering Information
| Model | Part Number | Nominal Voltage (VDC) | Candela |
|---|---|---|---|
| LFHS-177W | 4890075 | 24 VDC | 177 Cd |
| LFHS-177R | 4890076 | 24 VDC | 177 Cd |
| LFHS-110W | 4890077 | 24 VDC | 110 Cd |
| LFHS-110R | 4890078 | 24 VDC | 110 Cd |
| LFHS-15W | 4890079 | 24 VDC | 15 Cd |
| LFHS-15R | 4890080 | 24 VDC | 15 Cd |
Note: R = Red faceplate, W = White faceplate. All units are plain (no
lettering).
ALERT and FIRE bezels available for order.
24VDC Nominal Horn/Strobe Current Ratings (mA)
Horn/Strobe Current Ratings
Over Input Voltage Range of 16-33V (mA)
Candela| Horn Mode| 24VDC
Operating
Current
(NORMAL)| 24VDC
Operating
Current
(LOUD)| 24VFWR
Operating
Current
(NORMAL)| 24VFWR
Operating
Current
(LOUD)| Regulated
24VDC
Max.
Operating
Current
(NORMAL)| Regulated
24VDC
Max.
Operating
Current
(LOUD)| Regulated
24VFWR
Max.
Operating
Current
(NORMAL)| Regulated
24VFWR
Max.
Operating
Current
(LOUD)
---|---|---|---|---|---|---|---|---|---
15| Temporal 3 520 Hz| 112.0 mA| 144.0 mA| 163.0 mA| 198.0 mA| 124.0 mA| 182.0
mA| 201.0 mA| 252.0 mA
15| Temporal 4 520 Hz| 158.0 mA| 175.0 mA| 210.0 mA| 269.0 in | 195.0 mA|
291.0 m:| 273.0 mA| 339.0 mA
110| Temporal 3 520 Hz| 193.0 mA| 223.0 mA| 259.0 mA| 295.0 in | 280.0 mA|
326.0 mA| 348.0 mA| 427.0 mA
110| Temporal 4 520 Hz| 241.0 mA| 291.0 mA| 325.0 mA| 383.0111A| 384.0 mA|
474.0 mA| 470.0 mA| 555.0 mA
177| Temporal 3 520 Hz| 268.0 mA| 293.0 mA| 325.0 mA| 329.0 mA| 365.0 mA|
393.0 mA| 465.0 mA| 478.0 mA
177| Temporal 4 520 Hz| 337.0 mA| 391.0 mA| 428.0 mA| 477.0 mA| 427.0 mA|
525.0 mA| 693.0 mA| 759.0 mA
Horn Mode| Minimum SPL at 10ft. Per ANSI/UL 464 (NORMAL)| Minimum SPL at I
Oft. Per ANSI/ UL 464 (LOUD)
---|---|---
Temporal 3 520 Hz| 76.3 dBA| 78.8 dBA
Temporal 4 520 Hz| 80 6 dBA| 82.0 dBA
LFHS Wiring Diagram
Notes
- The LFHS is not listed for outdoor use.
- For nominal and peak current across ANSI/UL regulated voltage range for filtered DC power and unfiltered (FWR [Full Wave Rectified]) power, see installation manual.
- 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.
- This appliance is not recommended for use on coded or pulsing signaling circuits and is NFPA 72 Compliant.
Architect and Engineering Specifications
The audible and visible appliance shall be Potter Electric Signal Company model LFHS. The appliance shall be listed with Underwriters Laboratories (ANSI/UL) for use with fire protective signaling systems (ANSI/UL 1971 and ANSI/UL 464) and with CAN/ULC S526 and CAN/ULC S525 with intended use in fire alarm systems. The LFHS will produce a peak sound output of at least 75 dBA as measured in an anechoic chamber. The LFHS shall also maintain a minimum flash rate of 1 Hz or up to 2 Hz regardless of power input voltage. The strobe appliance shall have an operating current of 365 mA or less for the 177 candela strobe circuit with the horn set at the NORMAL setting. The appliance shall be polarized to allow for electrical supervision of the system wiring. The unit shall be provided with a mounting bracket with terminals and barriers for input/output wiring and be able to mount to a single gang or double gang box or double workbox without the use of an adapter plate. The LFHS shall be mounted on the wall. The unit shall have an input voltage range of 1633 volts with either direct current or full wave rectified power at 24 VDC. The appliance shall be capable of testing supervision without disconnecting wires, verify voltage without removing unit and be capable of mounting to a surface back box.
Potter Electric Signal Company, LLC
• St. Louis, MO
• Phone: 800-325-3936
• www.pottersignal.com
8830119-REV A 2/17
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