GC 800 SERIES
CONVENTIONAL GAS UNI T
OPERATING MANUAL
Revision 1.5: June 1998
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TABLE OF CONTENTSTABLE OF CONTENTS
1. FEATURES 1
2. HARDWARE DESCRIPTION 3
2.1 ELECTRICAL SPECIFICATION 3
2.2 LEGEND 4
2.3 CONNECTIONS 5
2.4 CONFIGURATION 7
3. OPERATION 8
3.1 OPERATION OF THE GC800 GCU 8
3.2 ISOLATED MODE 9
3.3 RESET 9
3.4 DOOR INTERLOCK MODE 9
3.5 FAULTS 9
3.6 LAMP TEST / SILENCE BUZZER 10
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
1. FEATURES
The GC800 gas control unit is designed to provide the automatic sequence required to discharge
fire extinguishing gas such as Halon and CO2. The unit is operated by two fire inputs. These are
normally wired to two independent zone output relays of a conventional fire panel. The fire panel
monitors the protected area for fire.
Local control is provided by means of a Manual Break Glass Unit as well as key switches for
manual/auto and isolate.
Monitored (polarity reversal) outputs are provided for bells, evacuation sign, siren and discharge.
Outputs are also provided for the connection to the GR800/900 and GS800/900 remote units.
A door interlock feature warns the user of the automatic/manual status of the unit. The GC800
features extensive fault monitoring; and a lamp test push button is provided.
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
* Note: Only one GR800 or GS800 may be connected
Figure 1
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
2. HARDWARE DESCRIPTION
2.1 ELECTRICAL SPECIFICA TION
2.1.1 Supply
24V DC min. : 19V
max. : 29V
Supply current standby : 80mA at 24V
max. : 280mA at 24V (Alarm and Lamptest)
2.1.2 Inputs (Fire 1 and Fire 2)
24V DC polarised min. : 19V
max. : 29V
Input current active : 4mA at 24V
2.1.3 Outputs
Fault : - Potential free change over
Bell, Siren, Evacuate Sign, Gas Discharge : - supervised in standby and
- Polarity reversal 24V DC fused
- Termination Rt = 5600 Ohm
- Short circuit < 1K Ohm @ 29V
- Open circuit > 50K Ohm @ 19V
contact 2A @ 24V DC
active mode for short and open
circuit.
at 1A
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
2.1.4 Dimensions
Box Length : 200mm
Width : 120mm
Height : 80mm
Total Height : 105mm
Box metal (optional) Length : 300mm
Width : 220mm
Height : 85mm
Total Height : 115mm
2.2 LEGEND
Figure 2
NOTE: When connecting the GR800/900 remote unit then remove and discard the 15K
termination resistor.
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
All fuses 1 Amp
F1 : Bell LED1 : Supply ok
F2 : Siren LED2 : Evacuation sign fault
F3 : Sign LED3 : External BGU fault
F4 : Gas discharged LED4 : Gas discharge fault
LED5 : Siren fault
LED6 : Bell fault
2.3 CONNECTIONS
2.3.1 Supp ly
1 Earth - Connect for interference suppression
2 24V +
3 24V -
2.3.2 Input
4 Door Interlock + 24V = Door open (unlocked)
5 Door Interlock - 0V = Door closed (locked)
6 Fire 2 +
7 Fire 2 - 24V = Fire
8 Fire 1 +
9 Fire 1 - 24V = Fire
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
2.3.3 Outputs
Polarity is shown in the active (alarm) state.
Polarity is reversed in Normal mode.
19 Gas discharged +
20 Gas discharged 21 Evacuate sign +
22 Evacuate sign 23 Siren +
24 Siren 25 Bell +
26 Bell 27 Fault nc
28 Fault no
29 Fault common
2.3.4 Connections to the GR800/900 and GS800/900 Remote Units
10 ext. BGU 11 ext. BGU +
12 rem. Lamp Test
13 rem. Fault led
14 rem. Isolated led
15 rem. Gas discharged led
16 rem. Auto led
17 rem. Manual led
18 rem. Buzzer
2 24V +
Note: Only one GR800/900 or GS800/900 may be connected to a GC800 unit.
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
2.4 CONFIGURATION
2.4.1 Gas Discharge Delay (J2 CE-FP-443, CPU Board)
J2 A : 0s J2 B : 45s
2.4.2 Evacuate Sign Mode (J1, CE-FP-444, Relay Board)
J1 B : Fire 1 or Fire 2 : Sign OFF
Fire 1 and Fire 2 : Sign ON
J1 A : Fire 1 or Fire 2 : Sign FLASH
Fire 1 and Fire 2 : Sign ON
2.4.3 Door Interlock Mode (J1, CE-FP-443, CPU Board)
J1 in : Enabled
J1 out : Disabled
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
3. OPERATION
3.1 OPERATION OF THE GC800 GCU
3.1.1 Manual Gas Release - Manual Call Point Operated
The operation of the manual call point is identical for both the auto and manual keyswitch
positions.
•
The bell relay is switched on
•
The evacuation sign relay is switched on
•
The siren relay is activated
•
The gas discharge delay (if set) is initiated
•
The discharge relay will be set after the elapse of the discharge delay
3.1.2 Controlled by the Fire Detection System
3.1.2.1 KEYSWITCH AUTO:
The first fire is flagged by either 24V DC on fire 1 OR fire 2 inputs.
•
The bell relay is activated
•
The evacuation sign operates according to the jumper setting - either off or intermittent
The second fire (double knock) occurs when both fir 1 AND fire 2 inputs are active.
•
The evacuation sign is switched ON
•
The siren relay is activated
•
The gas discharge delay (if set) is initiated
• The discharge relay will be set once the discharge delay has elapsed
3.1.2.2 KEYSWITCH MANUAL:
If the keyswitch is set to manual then the entire above procedure is performed except that
the gas discharge will not occur . Turning the keyswitch to auto will cause a gas discharge
if the delay sequence has timed out.
NOTE: Resetting of the fire panel will NOT reset the GC800 GCU. The gas control unit must
be locally reset using the 'isolate' keyswitch. (See 3.3 below).
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
3.2 ISOLATED MODE
The gas discharge relay can be isolated with the 'isolate/reset' keyswitch. This causes a
physical isolation of the gas discharge relay. In the isolated position the 'isolated' LED's will
be on and the keyswitch can be removed. 'Isolate' will cause a fault condition.
3.3 RESET
Any change of position of the 'isolate/reset' key will reset the GCU. If any fire or any fault
condition is present the GCU will immediately indicate these conditions after reset.
3.4 DOOR INTERLOCK MODE
If the Door Interlock mode is enabled the GCU warns a user by sounding a buzzer when :
•
the door is locked and the GCU is in the manual mode.
•
the door is unlocked and the GCU is in automatic mode.
The buzzer will sound until either the position of the lock or the operating mode of the GCU is
changed.
3.5 FAULTS
3.5.1 Fault Conditions
•
24V supply out of limit.
•
Termination of bell relay out of limit.
•
Termination of siren relay out of limit.
•
Termination of evacuate sign relay out of limit.
•
Termination of gas discharged relay out of limit.
•
Termination of remote manual break glass unit of limit.
•
GCU switched to isolated mode.
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
3.5.2 Actions on Fault
•
The two amber 'fault' LED's go on.
•
For the isolated condition the fault is indicated by the two 'isolated' LED's. All other faults
are indicated inside the unit by the fault indicators.
•
If the supply is out of limit none of the internal fault LED's will be on.
3.6 LAMP TEST / SILENCE BUZZER
If the Lamp Test button is depressed all LED's, all remote LED's, the buzzer and the remote
buzzer will switch on until the button is released. The correct status will be displayed
afterwards. The buzzer and remote buzzer will be silenced unless the Door Interlock mode
feature forces the buzzer on.
GC800 SERIES CONVENTIONAL GAS UNIT - OPERATING MANUAL Revision 1.5: June 1998
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