When the solenoid valve for the gas cylinder is connected to a 24 V power supply, it will activate immediately, resulting in a gas leak. Therefore, during commissioning, the solenoid valve must never be installed on the gas cylinder; it should only be connected after the system has been fully commissioned and verified to operate properly, and following successful fire‑safety inspection and acceptance.

1.1 System Overview

⑴ The pipeline‑free automatic fire suppression system is one application of gas‑based fire suppression technology. It is lightweight, portable, and offers flexible installation. In the event of a fire, it automatically activates to discharge extinguishing agent, with a short discharge duration and rapid extinguishing performance. This system can be equipped with our company’s cabinet‑type gas control panel designed specifically for single‑zone gas fire suppression systems (see JB‑QBL Single‑Zone Gas Control Panel).

⑵ The system can be started in three modes: automatic control, manual electrical control, and mechanical emergency manual control. Automatic control and manual electrical control are mutually switchable; under normal circumstances, manual control should be used, but it may be switched to automatic control when the protected area is unoccupied. If both automatic control and manual electrical control fail to operate, mechanical emergency manual control shall be employed.

⑶ The cabinet-type fire suppression system does not require a dedicated cylinder storage room; the entire cabinet is installed within the protected area, making it suitable for small‑space protected zones such as computer rooms, archives, vaults, and telecommunications equipment rooms. Multiple cabinet units can be interconnected to protect larger areas. This system is particularly appropriate when a dedicated cylinder storage room cannot be provided within the building, or when, although a storage room exists, the delivery distance is too great to meet engineering design requirements, or when installing a conventional piping network in the protected area would be impractical.

Legend:

1. Pressure‑relief indicator light 2. Emergency start/stop button 3. Audible and visual alarm 4. Fire detector 5. Electrical control wiring 6. Cabinet‑type fire suppression system 7. Pressure switch 8. Electromagnetic actuator 9. Alarm control unit

Specifications:

Design working pressure of the equipment	2.5 MPa
Maximum operating pressure of the device (50°C)	4.2MPa
Fire-extinguishing agent storage container charging pressure (20°C)	2.5MPa
Volume of the fire-extinguishing agent storage container	40L, 70L, 100L, 120L, 150L, 180L
Maximum spray duration	10s
Device operating power supply	DC24V
Gas storage ambient temperature	0°C ~ 50°C

1.2 System Installation
1. The installation location of this system shall meet the following requirements:

(1) The ambient temperature shall be between 0°C and 50°C, and the environment must be dry and well-ventilated.

(2) The air shall not contain explosive, conductive dust, or harmful substances that can corrode components; otherwise, appropriate protective measures must be implemented. The equipment shall be protected against vibration and impact.

(3) The entire cabinet must be installed level; tilting is not permitted.

(4) During fire suppression in the protected area, a closed‑environment condition shall be maintained. All openings other than pressure relief vents, as well as the fire dampers installed in the ventilation fans and ductwork serving that protected area, shall be fully closed prior to the discharge of heptafluoropropane.

(5) When an outward-opening flexible door closer or a spring‑loaded door is installed, if its opening area is not less than the calculated area of the pressure relief opening, no additional pressure relief opening is required.

(6) The installation location within the protected area shall be selected to avoid proximity to heat sources and direct sunlight, and shall be mounted close to the wall. The nozzle’s spray direction shall be oriented toward the protected area.

 

2. During installation of this system, the following sequence shall be followed:

Place the cabinet in the designated location within the protected area.

Place the fire‑extinguishing agent cylinder assembly into the cabinet, positioning it toward the rear and centered. During installation, avoid excessive impact and ensure the assembly remains upright.

Connect the pipeline assembly to the container valve outlet of the cylinder bank using a union nut. Note that, prior to connecting to the container valve outlet, first screw the union nut onto the pipeline (this is a left-hand thread). The insertion depth should be such that the sealing arcuate surface of the connecting pipe aligns closely with the bottom surface of the right-hand thread on the union nut. Then, secure the right-hand thread to the container valve outlet by tightening it by hand.

Verify that the nozzle mounting pipe is aligned with the nozzle mounting hole in the cabinet. If not, adjust the connecting clamp to achieve alignment, ensuring that the pressure switch housing on the clamp is oriented neither directly forward nor directly rearward. Once properly adjusted, secure the locking nut on the piping assembly.

Perform auxiliary sealing on the nozzle connection pipe (by wrapping with Teflon tape or applying sealant) and then install the nozzle.

Fine-tune the position of the fire-extinguishing agent cylinder assembly so that it rests against the rear wall of the cabinet and is centered.
Install the clamp and hook to secure the cylinder assembly.
Tighten the connecting nut with a wrench.

After applying auxiliary sealing to the pressure switch, install it into the pressure switch mounting base; then mount the solenoid actuator onto the container valve and secure the cabinet door. Installation is complete.

1.3 System Debugging

 

Once the system has been installed, it can be commissioned.
Note:

When the solenoid valve for the gas cylinder is connected to a 24 V power supply, it will activate immediately, resulting in gas leakage. Therefore, during commissioning, the solenoid valve must never be installed on the gas cylinder; it should only be connected after the system has been fully commissioned and verified to operate properly, and following successful fire‑safety inspection and acceptance.

During the delay period, after the delayed start, and upon detection of a pressure switch actuation signal, the control panel maintains both audible and visual alarm indications until reset, thereby alerting on-site personnel.
After the system is properly connected (excluding the solenoid valve), perform a comprehensive system commissioning.

Delayed Start Function Debugging

Press the emergency start button; at this point, the control panel’s “delay” indicator light illuminates, and the audible‑visual alarm activates. The controller then initiates the “gas‑start” sequence. Once the delay period elapses, the control panel energizes the solenoid valve; the control panel’s “start” indicator remains steadily lit, and the solenoid valve operates for approximately 5 seconds (this duration is adjustable). If a zone contains multiple solenoid valves, they must activate simultaneously, with a timing deviation not exceeding 5 seconds.

b) Short-circuit the pressure switch with a wire; at this point, the “Spray” indicator light on the control panel illuminates, and the external spray indicator light also lights up; the controller reports a “Gas Initiation” signal.

c) After the system is restarted, set the master–standby switch to “Standby Operation”; at this point, the “Standby Operation” indicator on the control panel will illuminate. The controller shall report a “Standby Operation” activation; repeat steps 1–5 several times, and the functionality should remain unchanged.

d) Use the controller to perform interlocked start-up control; the “delay” indicator light on the control panel illuminates, and the audible‑visual alarm activates.

2) Immediately initiate functional debugging.

Start the system by pressing the start button on the control panel. At this point, the “Start” indicator light on the control panel will remain steadily illuminated, and the solenoid valve will activate and maintain its position for approximately 5 seconds (this duration is adjustable).

After pressing the button on the manual fire‑start panel that corresponds to the “Gas Start” coding point on the controller, the control panel’s “Start” indicator will remain steadily illuminated, and the solenoid valve will activate and maintain its operation for approximately 5 seconds (this duration is adjustable).

3) Debugging of fault display and reporting functions

Disconnect any wiring between the control panel and the emergency start/stop button; the control panel’s “Fault” indicator will illuminate, and the controller will report a “Gas Start” fault.

Short‑circuit any two of the three terminals (L1, G, L3) of the emergency start/stop button with a wire; the control panel’s “Fault” indicator will illuminate, and the controller will report a “Gas Start” fault. Short‑circuit the input terminal of the solenoid valve with a wire; the control panel’s “Fault” and “Output Fault” indicators will illuminate, and the controller will report a “Gas Start” fault.

Disconnect any wiring between the control panel and the pressure switch; the control panel’s “Fault” indicator will illuminate, and the controller will report a “Gas Start-up” fault.

Disconnect any wiring between the control panel and the spray‑indicator light; the control panel’s “Fault” indicator will illuminate, and the controller will report a “Gas Initiation” fault.
The input terminal of the spray‑indicator light is shorted with a wire, causing the “Fault” indicator on the control panel to illuminate and the controller to report a “Gas‑Initiated” fault.

Note: During debugging, ensure that only one solenoid valve is activated per terminal module. If multiple solenoid valves are triggered simultaneously, they may operate, but the combined force might not be sufficient to rupture the cylinder’s safety diaphragm (the exact outcome remains to be verified through testing). Solution: Add a relay and a backup power supply to address this issue.

1.4 Precautions

(1) During transportation, fire extinguisher cylinders shall be handled with care to prevent impacts and overturning. The entire unit should be kept away from heat sources and protected from direct sunlight.

(2) During disassembly and assembly, care must be taken to avoid damaging the surface and compromising the appearance. Unauthorized personnel are prohibited from tampering with this device to prevent accidents.

(3) Before the cabinet‑type system discharges the extinguishing agent, all personnel must evacuate the fire scene during the delay period. Upon completion of firefighting, the ventilation fan must be started first to exhaust the combustion gases; only after this may personnel enter the site.

(4) New diaphragms must be supplied by our company; unauthorized substitution with untested diaphragms is strictly prohibited.

(5) During routine maintenance, servicing, or periodic inspections, operations must be carried out strictly in accordance with the prescribed procedures to ensure that accidental discharge of the extinguishing agent is prevented.

1.5 Training:

Organize training for Party A’s fire‑watch personnel prior to their onboarding, covering key topics such as the location of each system, the operating principles of major equipment, emergency response procedures, and basic operations of the main control cabinet.

1.6 Handover:

Acceptance approved, training completed, and handover of the project conducted with the relevant responsible parties from Party A; key completion milestones achieved.
For the handover of materials and engineering equipment, Party A is requested to sign the Engineering Acceptance Handover Form.

1.7 System Maintenance and Upkeep:

a. Maintenance and upkeep of the protective zone environment:
● Ensure that all necessary access routes to the protected area remain unobstructed; verify that all alarm signals and safety signs are clean, complete, and clearly visible; confirm that natural lighting, general illumination, and emergency lighting are in good working order.
● Inspect smoke and heat detectors to ensure their exterior surfaces are clean, free of dust and environmental contaminants (such as fine particulate matter or paint), thereby maintaining their sensitivity; also verify that the nozzle openings are unobstructed.

b. Maintenance and upkeep of fire-extinguishing agent storage containers:
Each year, fire-extinguishing agent storage containers shall be weighed or their storage pressure checked; if the pressure falls below the minimum allowable level, the containers must be refilled or replaced.

c. Maintenance and servicing of the fire suppression control panel:
● Verification of the reliability of the power supply and indicator lights;
● Verify that the fire suppression control panel’s start-up test is functioning properly.

d. System maintenance and upkeep:
● Verify that the wiring connecting the solenoid valve and the control valve is intact, and check for any loose or disconnected terminals. *Remove the solenoid valve from the cylinder and confirm that it operates smoothly and freely.
● Disconnect the connection devices between the alarm and control system and the actuators, and use simulation testing to verify the sensitivity and operational reliability of the automatic control, alarm, and delay functions.
● Check whether the connections between the nozzle and the pipeline are loose or detached.
● Inspect the exterior of all cylinders for signs of corrosion and coating delamination.
● Remove the pressure switch and verify that its operation is accurate and responsive.

The above is for reference only; please contact our company’s technical experts for clarification on the specific implementation plan.

Technical Service Hotline: 18922363119 / 18022419119