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10 - OPERATION AND MAINTENANCE
■ Coil maintenance
- If the fins are damaged, straighten them using a comb suited to the width of the fins.
- Instruction in case of low fouling level (non-clogging dust or dry residue)
- Counter-flow supply air: dry air up to 30 bar.
- Where possible, periodically reversing the flow of air generated by the fans can prevent this.
- In the event of moderate fouling (moderate clogging due to dry residues, wet or greasy dust, insects, etc.):
• Use a high-pressure (HP) steam cleaner with a flat jet nozzle (25°),
• Max. pressure 100 bar,
• Steam: max. 140°C,
• Min. distance between the nozzle and the fins = 200 mm,
• Cleaning fluid: municipal water with pH neutral detergent (pH 7). Avoid alkaline detergents,
• Flushing with clean water using the same adjustment parameters.
The use of detergent is prohibited for cleaning fins with a BLYGOLD
■ Prolonged downtime
- To prevent the formation of ice during prolonged downtime, fully drain the coil. Blow all the circuits with compressed air to bleed
them fully. Without this additional pressure, significant amounts of fluid may remain, posing a serious risk of damage in the event
of freezing (not covered by the warranty).
- Recover the water/glycol mixture in accordance with the regulations in force at the installation site.
- If the hydraulic circuit is drained for a period of more than one month, fill the entire circuit with nitrogen to prevent any risk of
corrosion. Observe the maximum operating pressure values indicated in the unit's technical specifications.
10.5 - Electric heater
Warning!
Follow the safety instructions (see § 2 - SAFETY INSTRUCTIONS).
■ Frequency:
- Every three months
- Every month for ATEX units
- Follow the instructions given in section 10.1 General recommendations for cleaning
■ Maintenance:
- In case of problems or if the heaters need to be accessed, they can be removed for complete cleaning or replacement.
■ Assembling and disassembling the heater
- Remove the front panel, then the mounting screw to remove the heater.
- For units supplied with a control unit, the electrics box must be disassembled before the heater is disassembled.
■ Coil maintenance
Before carrying out any work:
- Cut the coil supplies.
- Run the ventilation until the heating elements have completely cooled to ambient temperature.
- Cut the fan supplies.
■ During maintenance:
- Check the general condition of the coil,
- Retighten the heating element connections (tightening torque 2.5 Nm),
- Check the condition of the heating elements for fouling, damage or corrosion,
- Check that the temperature limiters are operating correctly,
- Check the earth conductor,
- If necessary, clean the heating elements.
Do not use a cleaning product or cloths with detachable fibres (e.g. cotton/wool) on the heating elements.
- Make sure the electric heater box is clean and free from foreign objects
- Remove any impurities using a vacuum cleaner and/or a cleaning product,
Never activate the heaters in the absence of air flow.
ELECTRICAL DANGER: Door for directly accessing the electrical connections. Lock the door with the key once closed.
, ALTENA
or HERESITE
®
®
®
coating.
65
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