LCN 7900 Installation guide
- Category
- Fire protection
- Type
- Installation guide
This manual is also suitable for
LCN 7900 is a series of door closer control boxes designed to work with LCN Auto-Equalizer door closers, enabling automatic door opening in response to smoke evacuation systems. It features a compact design, simple installation, and adjustable air pressure for optimal performance. With its reliable operation and easy integration, LCN 7900 enhances the safety and functionality of fire alarm systems in various commercial and institutional buildings.
LCN 7900 is a series of door closer control boxes designed to work with LCN Auto-Equalizer door closers, enabling automatic door opening in response to smoke evacuation systems. It features a compact design, simple installation, and adjustable air pressure for optimal performance. With its reliable operation and easy integration, LCN 7900 enhances the safety and functionality of fire alarm systems in various commercial and institutional buildings.
*19282*
19282
© Allegion 2014
Printed in U.S.A.
19282 Rev. 01/14-d
System Function
The 7949 series Blow-Open Box is designed for work witha 7901 or 7902 series closer control box and one or more LCN Auto-
Equalizer(s) door closer. When power supply to the unit is interrupted by a smoke evacuation system, the 7949 Blow-Open Box overrides
the closer control box, opening door(s) with the Auto-Equalizer(s) to allow fresh air into the building. This system is NOT to be used on re
rated doors.
Installing the Blow-Open Box
1. Locate box within 5 feet of 7900 series control box. It must be mounted in a clean, dry place where temperatures do not exceed
120°F or fall below 35°F.
2. Mount box to a structurally sound surface using screws provided, with air ttings on left side, as shown on page 4. Do not mount box
upside down or horizontally.
3. Refer to closer control box instructions and actuator switch instructions. Connect switch leads to proper terminals in the closer control
box at this time.
4. Connect all air lines to both boxes per required installation (see page 2 for options).
5. Connect non-powered 120 VAC line to terminals located in Blow-Open Control Box. If an electronic strikes or latching devices are
being used, refer to teh ES7949 box diagram.
6. Turn on power to both boxes. Valves will cycle once when power is applied. After cycle is complete, turn on air supply to both boxes.
7. Set air pressure at 80 psi in both boxes. Turn regulator knob clockwise to increase pressure, counter-clockwise to decrease pressure.
Cycle once with manual override and readjust air pressure if necessary.
8. Test actuator switches to ensure wiring and tubing are properly connected.
LSystem Note: A minimum ve second delay (by others) is required BEFORE smoke evacuation blowers start to allow doors
to sufciently begin to open.
For Auto-Equalizer & Regular Control Box information, see installation instruction sheets packed with those products.
LNOTE: The 7949 blow open control box is designed to assist in smoke evacuation from re alarm systems with a normally
closed dry contact output. Blow open installations are not listed under section GVEV of the UL Building Materials Directory.
The 7949 blow open control boxes are assembled with UL recognized components, it should NOT be used on re rated doors
as described in GVEV of the UL Building Materials Directory.
Blow-Open Control Box
Model 7949/ES 7949
Installation Instructions
120VAC
Input
120VAC
12VDC
Wiring to
Actuator(s)
Air Supply
Exhaust Muffler
Regulated Air from
Control Box to
Auto-equalizer(s)
®
Customer Service
1-877-671-7011 www.allegion.com/us
* Optional Wiring:
Connect 120VAC Input
with Fire Alarm Auxiliary
Contacts to Terminal
Strip to Open Door(s)
120VAC
Input
Air Inlet
80 psi - 100 psi
Clean, Dry
Air Required
Air Outlet to
Closer Control
Box.5 Ft.max.
Tubing Length
Exhaust
(Do Not Paint)
Electrical Information:
Input:120VAC .12 Amps
Power Consumption:14.4 Watts
7949ES Blow - Open Control Box
Install Boxwithtwotapcon
Concrete Screws 3/16 X 1 1/4".
Drill 5/32 Hole X 1 1/4 Deep.
Use A Carbidetipped Drill
If Mounted On Masonary Surace.
Earth
Ground
Control Box Must
Be Connected to
Earth Ground.
DANGER
!
Filter*
Air Pressure
Regulator
Caution:
Locate this box in areas
Where the temperatures do not
exceed 120°f or fall below 35°F.
A
1a EACH TIME THE BOWL IS CLEANED OR FILTER ELEMENT IS REPLACED:
1. Depressurize unit
2. Inspect seals and replace cracked, damaged or deteriorated seals with original manufacturers approved seals only.
1b FILTER ELEMNT - Clean periodically by removing lter, tapping on a hard surface & blowing off with pressurized air.
1c AUTOMATIC DRAIN - If drain fails to keep bowl sufciently free of water, use a small screwdriver to push the piston
up, allowing bowl to drain.
1d Be sure bowl is securely reinstalled before putting the unit back into service.
1e Replacement lters can be ordered from LCN.
Typical Airline Hook-up Application
Air
Supply
Air
Supply
Air
Supply
5'-0" Max.
Distance
5'-0" Max.
Distance
Regulated Air
Output to
Auto-Equalizer
®
Regulated Air
Output to
Auto-Equalizer
®
Regulated Air
Outputto
Auto-Equalizer
®
Fig.1
1a Connect 1/8” I.D. tubing from air source (providing 80psi to 100psi of clean, dry air) to air inlet ttings located on the
side of both the control box & blow-open box.
1b Removed exhaust mufer from 7901/ ES 7901 or 7902/ ES 7902 control box and install auxiliary air inlet tting from
hardware package shipped with blow-open box. See Fig. 1.
LNOTE: when blow-open box is being used independently, connect 1/8” I.D. tubing from air outlet of blow-open box directly
to Auto-Equalizer®.
1c Connect 1/8” I.D. tubing from “exhaust” tting on side of control box to outlet “A” tting on the blow-open box.
1d Connect 1/8” I.D. tubing from outlet tting “A” and/or tting “B” of the control box to corresponding Auto-Equalizer®
unit.
Relay For Electronic
Strike / Latching
Device Is Optional
Air Inlet 80psi - 100psi
Clean, Dry Air Req'd
Regulated Air Output
To Auto-Equalizer
Remove Exhaust
Fitting And Replace
With Air Inlet Fitting
(Receives Air Output
From Blow Open Box)
®
* Filter
LED
Earth
Ground
12VDC Output
Trigger A
Neutral
Line
120vac Input
To Fire Alarm
Relay For Electronic
Strike / Latching
Device Is Optional
Remove Exhaust
Fitting And Replace
With Air Inlet Fitting
(Receives Air Output
From Blow Open Box)
Regulated Air Output
To Auto-Equalizer
®
Air Inlet 80psi - 100psi
Clean, Dry Air Req'd
* Filter
LED LED
Earth
Ground
12VDC Output
Trigger A
Neutral
Line
120vac Input
To Fire Alarm
Trigger B
Locate this box In areas
where the temperatures do not
exceed 120°F or fall below 35°F.
Caution:
Electrical Information
Input 120VAC .15 Amps
Power Consumption 15 watts
Output - 120VDC
A
A
Muffler
7949ES Blow Open Box
Refer to Instruction Sheet For ED wiring.
(6 Wires Used For ES Option Not Shown For Clarity)
Electrical Information
Input 120vac .12 Amps
Power Consumption 14.4watts
Air Inlet
80psi Reqd.
100psi Max.
Clean Dry
Air Reqd.
Exhaust
From
Control
Box
5 Feet
Max.
Tubing
Length
Exhaust
Do Not Paint
Filter Maintenance
1. Each Time Bowl Is Cleaned Or The Filter Element Replaced:
A. Depressurize Unit.
B. Inspect Seals And Replace Crazed, Cracked, Damaged Or Deteriorated Seals With Original Manufacturer's
Approved Seals Only.
2. Filter Element -clean Periodically By Removing Filter, Tapping On Hard Surface And Blowing Off With Are
Blow Gun.when Cleaning Or Replacing Element, Blow Off Louvers With Air Blow Gun.
3. Automatic Drain Models- If Automatic Drain Fails To Keep Bowl Sufficiently Drained Of Water, Carefully Unthread The Drain
Fitting From The Filter Bowl And Use A Paper Clip To Push The Piston Up, Allowing Sediment Or Water To Drain From Bowl.
4. Before Placing Unit In Service Be Sure That The Bowl And Drain Line Are Securely Reinstalled.
5. Replace Filter With LCN Part No. 929.
Blow Open
Control Box
Air Valve
By LCN
Es Blow Open Control Box
Blow Open
Control Relay
By Lcn
Any N.C.
Fire Alarm
Contacts
120VAC
Power
Input
(Wiring By
Others)
Black Black
Pink
Wired
W/
B
R
O
W
N
V
I
O
L
E
T
B
R
O
W
N
W/
V
I
O
L
E
T
Function: Doors Are Manual Opening In Standby, When Fire
Alarm Panel Opens Auxiliary Contacts. Doors
Open By Air Pressure And Remain Open Until
Auxiliary Contacts Close. Coordination With
Panic Hardware By Others. This Is Not A UL
Listed Application.
Connect Striketo N.O. Contacts On Relay.
Contacts Closed With Power Applied.
When Power Is Out Or Alarm Condition. Contacts
Open And Strikes Release.
5
Note: Optional Exhaust Fans Or Blowers (By Others)
Second Delay (By Others) Required Before Fans Or Blowers
Start Consult Factory For Other Applications
Install Box with Two Tapcon
Concrete Screws 3/16 X 1 1/4".
Drill 5/32 Hole X 1 1/4 Deep.
Use A Carbide Tipped Drill
If Mounted On Masonary Surface.
Earth
Ground
Control Box Must
Be Connected To
Earth Ground.
DANGER
!
Filter*
Air Pressure
Regulator
Caution:
Locate this box In areas
where the temperatures do not
exceed 120°F or fall below 35°F.
*
A
Additional Notes: Revision History Revision Description:
D > Revised artwork
1. None D E F G H J
043228
Material
White Paper
Edited By Approved By EC Number Release Date
D. Myers M. Sasso 043228 01-01-14
Notes
1. printed two sides
2. printed black
3. tolerance ± .13
4. printed in country may vary
5. drawings not to scale
Title
7949/ES7949 Series Blow-Open Control Box Instruction Sheet
Creation Date
01-02-13
Number
19282
Revision
D
Created By
N/A Activity
3899 Hancock Expwy
Security, CO 80911 © Allegion 2014Software: InDesign CS6
4.25
FRONT
25.50
25.50
11.000
11.000
11.000
BEGINNING SHEET
FOLDED SHEET
FRONT
Page 3
Page 5 BLaNK Page Page 1
Page 2 Page 4
-
1
-
2
-
3
-
4
-
5
-
6
LCN 7900 Installation guide
- Category
- Fire protection
- Type
- Installation guide
- This manual is also suitable for
LCN 7900 is a series of door closer control boxes designed to work with LCN Auto-Equalizer door closers, enabling automatic door opening in response to smoke evacuation systems. It features a compact design, simple installation, and adjustable air pressure for optimal performance. With its reliable operation and easy integration, LCN 7900 enhances the safety and functionality of fire alarm systems in various commercial and institutional buildings.
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