Explosion-proof FFU Installation + Maintenance Complete Set of Precautions (Industry Practical Version)
I. Precauciones de instalación
1. Preliminary Selection and Environmental Matching
Select according to the actual explosion-proof area level (Ex d IIB/IIC T4/T6, gas / dust explosion-proof classification), and strictly prohibit using ordinary FFU to replace explosion-proof units.
Confirm the temperature and humidity, corrosive gases, and concentration of flammable and explosive vapors on site, and match with anti-corrosion and anti-static models.
Verify the load-bearing capacity of the clean room ceiling, as the explosion-proof FFU is heavier, the brackets and ceiling frame must be reinforced.
2. Electrical Installation (Explosion-proof Core)
Use explosion-proof conduit, explosion-proof junction boxes, and sealed joints for electrical wiring. Ensure the sealing of interface fillers is compact to prevent combustible gas from entering the cavity.
Must perform reliable grounding and equip potential equalization connections. Connect the entire machine, frame, and metal parts of the ceiling to eliminate static accumulation.
Do not privately modify or connect power lines; the wiring must be firmly pressed to prevent short circuits and sparking; switches and controllers must be of explosion-proof type.
Use explosion-proof frequency converters / explosion-proof control modules for variable frequency control. Ordinary speed regulators are prohibited from use in explosion-proof areas.
3. Mechanical and Layout Installation
Handle with care during installation to prevent the fan housing and explosion-proof motor from being scratched or damaged. The explosion-proof surface must not be scratched or deformed.
Install the unit horizontally, ensure the integrity of the sealing strips, and seamlessly fit with the ceiling air outlets to prevent random leakage of flammable and explosive gases.
Reserve maintenance space to avoid obstructions from pipes and ducts to the air inlets and outlets, ensuring smooth airflow.
When installing multiple units side by side, control the spacing to avoid turbulent airflow, resonance, and abnormal noise, and reduce heat accumulation.
4. Cleanliness + Explosion-proof Sealing Requirements
Ensure the efficient filter installation is sealed properly, with no air leakage from the frame, and no damage to the filter material; all explosion-proof screws must be fully tightened, and explosion-proof bolts must not be omitted or mixed.
During the entire installation process, no open flames, electric welding, or sanding operations are allowed. If necessary, a fire approval must be obtained.
II. Daily Maintenance Precautions
1. Daily Inspection
Daily checks: Listen for abnormal sounds, vibration, excessive heat, and odors. If any issues are detected, stop the machine and cut off the power immediately.
Regularly inspect the explosion-proof shell, junction boxes, and sealing components for any cracks, aging, or loosening. Ensure the sealing of the explosion-proof surface is intact.
Check the grounding lines for no detachment or rust, and ensure the equipotential connection is intact.
2. Filter Maintenance
Replace the efficient filter screen according to the pressure difference of the clean environment regularly. Replace it promptly if the resistance exceeds the limit to avoid overload and equipment burnout.
Replace the filter element when necessary, and first cut off the main power supply. Do not open the cover while powered on; reseal and lock the explosion-proof cover plate after replacement.
If the discarded filter material adsorbs flammable and explosive dust / solvents, handle it in accordance with hazardous waste regulations and prohibit random stacking.
3. Motor and Fan Maintenance
Do not disassemble the explosion-proof motor privately. Once the explosion-proof structure is damaged, the explosion-proof performance will directly fail.
Regularly clean the dust and oil on the impeller (operate with power off). Avoid combustible dust accumulation and imbalance in the rotor causing high temperatures.
Regularly check the lubrication of the bearings and use compatible high-temperature lubricating grease. Do not mix with ordinary grease.
4. Electrical System Maintenance
Regularly tighten the connection terminals and explosion-proof joints, inspect the aging and cracking of cables, and replace damaged components in time.
Do not privately modify the circuit, remove explosion-proof components, or short-circuit protection devices.
Perform insulation tests regularly in humid and corrosive environments to prevent leakage and short circuits that could ignite.
5. Environmental and Safety Management
In the explosion-proof FFU operation area, strictly control the concentration of volatile substances such as organic solvents, electrolytes, and alcohol.
Use anti-static rags for cleaning equipment and prohibit using hard tools to strike the explosion-proof shell. Do not use high-pressure water guns to directly rinse.
Fault repairs must be performed by personnel with explosion-proof electrical certification. After repair, restore the explosion-proof structure and sealing.
III. Prohibited Red Lines (Absolutely Not Allowed)
Do not open the explosion-proof junction box or cover plate while powered on.
Do not damage, sand, or modify the explosion-proof joint surfaces.
It is strictly prohibited to operate beyond the temperature and pressure limits or with excessive load for an extended period;
It is strictly forbidden to mix ordinary non-explosion-proof controllers, sockets and lamps in the explosion-proof area;
It is strictly prohibited to operate with accumulated dust and clogged nets for a long time to prevent the motor from overheating and igniting combustible materials.
