Technical Manual for the
Horn – DB1P UL
DB1HP UL
Please note that every care has been taken to ensure the accuracy of our technical manual. We do not, however, accept responsibility for damage, loss or expense resulting from any error or omission. We reserve the right to make alterations in line with technical advances and industry standards.
1.INTRODUCTION
These horn units have been designed for use in harsh environmental conditions.
2.INSTALLATION
General
When installing and operating explosion-protected electrical equipment, require-ments for selection, installation and operation should be referred to eg. IEC
60079-14 worldwide and the ‘National Electrical Code’ in North America.
Additional national and/or local requirements may apply.
Ensure that all nuts, bolts and fixings are secure.
Ensure that only the correct UL listed stopping plugs are used to blank off unused gland entry points and that the NEMA/IP rating of the unit is maintained.
The unit is mounted via 2 x Ø 0.31” (8 mm) fixing holes in the base. The fixing holes have been designed to accept an M6 screw or bolt. MEDC recommend the use of stainless steel screws.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew and remove the 4 off screws holding the cover assembly to the base.
Keep in a safe, accessible location.
Twist the cover gently clockwise and anti-clockwise, whilst pulling it away from the unit. Remove to gain access to the interior of the base.
Cable termination should be in accordance with specifications applying to the application. MEDC recommend that all cables and cores should be fully identi-fied.
Ensure that only correct UL Listed cable glands are used and that the assembly is shrouded and correctly earthed.
All cable glands should be of an equivalent NEMA/IP rating to that of the unit and integrated with the unit such that this rating is maintained.
The internal earth terminal (where fitted), must be used for the equipment ground-ing connection and the external terminal is for a supplementary bonding connec-tion where local codes or authorities permit or require such a connection.
Once termination is complete, carefully push the cover back onto the unit, avoid-ing damage to the mating surfaces. Replace & tighten the 4off cover screws
evenly, to ensure maintenance of the required gap between the cover and enclo-sure.
GENERAL ARRANGEMENT
2 - HOLES 5/16" / 8mm DIA
5 1/2" / 140mm FIXING CRS 3 1/8" / 79mm
6 7/8" / 175mm DIA 3 1/8" / 79m m
5 1/2" / 140m m  F I X I N G  C R S
6 3/4" / 171mm DIA
6 5/8" (81/2") / 168m m  (216m m )
4 1/8" (6") / 105m m  (152m m )
1 3/16"
30m m
ALL DIMENSIONS IN INCHES AND MILLIMETERS
SWITCH TONE Nom O/P TONE FREQ/DESCRIPTION SETTING DESCRIPTION(dB(A)
12345@1M) 1Alt Tones 800/970 Hz at 1/4 sec11111114 2Sweeping 800/970 Hz at 7Hz11110Fast Sweep(LF)114 3Sweeping 800/970 Hz at 1 Hz11101Med Sweep(LF)114 4Continuous at 2850 Hz11100109 5Sweeping 2400-2850 Hz at 7 Hz11011Fast Sweep114 6Sweeping 2400-2850 Hz at 1 Hz11010114 7Slow Whoop11001Slow Whoop115 8Sweep 1200-500 Hz at 1 Hz11000Din Tone115 9Alt Tones 2400/2850 Hz at 2 Hz10111111 10Int Tone of 970 Hz at 1 Hz10110Back-Up Alarm(LF)114 11Alt Tones 800/970 Hz at 7/8 Hz10101114 12Int Tone at 2850 Hz at 1Hz10100Back Up Alarm(HF)109 13970Hz at 1/4 sec on 1 sec off10011114 14Continuous at 970 Hz10010114 15554Hz for 100mS / 440 Hz for 400mS10001French Fire Sound101 16Int 660 Hz 150 mS on 150 mS off10000Swedish Fire Alarm106 17Int 660 Hz 1.8 sec on 1.8 sec off01111Swedish Fire Alarm106 18Int 660 Hz 6.5 sec on 13 sec off01110Swedish Fire Alarm104 19Continuous 660 Hz01101Swedish Fire Alarm106 20Alt 554/440 Hz at 1 Hz01100Swedish Fire Alarm100 21Int 660 Hz at 7/8 Hz01011Swedish Fire Alarm106 22Int 2850 Hz 150 mS on 100 mS off01010Pelican Crossing109 23Sweep 800-970 Hz at 50 Hz01001Low Freq Buzz113 24Sweep 2400-2850 Hz at 50 Hz01000High Freq Buzz112
25  3 970Hz pulses 0.5on/0.5off, 1.5 off00111113
26  3 2850Hz pulses 0.5on/0.5off, 1.5 off00110109 27Int 3100 Hz 0.32s on / 0.68s off00101110 28Spare/Customer Tone00100
29Spare/Customer Tone00011
30Spare/Customer Tone00010
31Spare/Customer Tone00001
32Spare/Customer Tone00000
3.OPERATION
3.1The unit is initiated directly from the power source.
The DB1P  & DB1HP units include two 5-way DIL switches to select any two
tones from the list. Use SW2 to select tone 1 & SW1 to select tone 2.
3.2Single Stage Alarm (d.c. version only)
To operate as a single stage alarm, set the appropriate tone using SW1 and
connect input wires to TB1 (+ve) (red) and TB5 (–ve) (blue). Loop in and loop
out is then TB2 and TB6.replaceable
To operate in supervisory mode, reverse the voltage between TB1 and TB5
(such that TB1 is -ve and TB5 +ve).
Note that there is a diode mounted on the PCB which will inhibit the operation
of the sounder in the supervisory (reverse voltage) mode.
3.3Two Stage alarm (d.c. version only)
To operate as a two stage alarm, set the required tones using SW2 for tone 1
and SW1 for tone 2.
3.3.1Reverse Polarity Set Up
Connect input wires to TB1 (+ve) (red) and TB3 (–ve) (black), tone 1
will sound. Reverse the voltage so that TB3 is +ve and TB1 is –ve, tone
2 will sound.
3.3.2Common +ve Set Up
Connect input wires to TB1 (+ve) and separate –ve’s to TB3 and TB5.
When TB3 is –ve tone 1 will sound, when TB5 is –ve tone 2 will sound.
3.4Single Stage Alarm (a.c. version)
When the unit is powered only a single stage alarm is available.
Tones should be selected using SW1. Connect input wires between TB1 and
TB3.
Note: In all set ups, loop in and loop out is facilitated by TB2, TB4 and TB6 as
appropriate.
4.MAINTENANCE
During the working life of the unit, little or no maintenance is required. However, if abnormal or unusual environmental conditions occur due to plant damage or accident etc., then visual inspection is recommended.
If a fault should occur, it is recommended that the unit be returned to MEDC for repair. All parts are replaceable.
If you have acquired a significant quantity of units, it is recommended that spares are also made available. Please discuss your requirements with the Technical
Sales Engineers at MEDC.

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