31
11UNT-PRC002-GB
Sound power levels
Discharge
Measurement conditions:
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
long) fixed to its discharge opening.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 55 50 42 37 37 31 30 46
FWD 08 2 57 54 47 40 30 38 40 50
3 58 57 50 42 32 40 43 53
1 57 51 45 42 34 33 28 48
FWD 10 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 57 51 45 42 34 33 28 48
FWD 12 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 56 62 50 48 39 38 36 56
FWD 14 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
1 57 63 51 49 40 39 37 57
FWD 20 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 56 55 55 53 46 45 42 57
FWD 08 2 63 62 60 60 53 53 53 64
3 66 65 63 62 56 55 57 67
1 62 58 55 58 51 48 44 61
FWD 10 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 62 58 55 58 51 48 44 61
FWD 12 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 66 65 65 65 57 50 46 68
FWD 14 2 73 72 69 71 64 59 57 74
3 78 76 73 75 69 64 63 78
1 68 72 64 64 56 52 50 69
FWD 20 2 76 76 68 71 65 61 61 75
3 78 79 71 74 69 66 66 78
AH-SVX03C-GB
General information
Units have been designed to minimize maintenance. A maintenance interval plan is provided as guidelines for
standard machine operation. Any strong deviations in the usage pattern may require additional maintenance.
This must be checked in individual cases.
WARNING! During maintenance procedures, the installation must be completely isolated and precautions taken to
prevent any premature re-start.
Maintenance, inspection and cleaning operations should be carried out by qualified personnel. The manufacturer
does not take any responsibility for system cleaning.
Fan and motor
Long-term storage (3 months) of a fan-motor assembly may cause damage to the bearings (brinelling); in case of
long term storage, it is necessary to turn the fan wheel from time to time.
Every six months:
• Check for soiling, damage, corrosion and any tendency to bind and clean as necessary.
• Touch up any spot damage to the unit casing and the fan impeller using a zinc based paint.
• Check the air tightness of any flexible connectors.
• Check the function of any anti-vibration dampers.
• Check the cleanness of any weather protective grills.
• Check all fan bearings for sign of wear and/or grease leakage.
• Lubricate the fan bearings (if not sealed for life type).
• Check bearing locking set screw and other setscrews for proper tightness. All bearing races must be secured.
• Lubricate fan motors.
• Align pulleys and check level of shafts.
• Check fan belt tension. Adjust if belt slips.
• Replace worn or frayed belts with a new matched set. Do not force belts onto pulleys.
Once a year:
• Inspect electrical wiring for condition. Tighten all connections.
• Inspect the unit casing and accessories for chipping and corrosion. If damage is found, clean and repair.
• Clean fan wheels and shaft.
• Remove rust from fan shaft with an emery cloth, and recoat the shaft with a suitable varnish.
• For external units, check the access door seals are in good condition and replace if necessary. Adjust the hinges to
take up any looseness.
• Bearings lubrication. Use only lithium grease, without chemical impurity. Recommended lubricants:
ALVANIA (Shell)
MOBILUX 3 (Mobil)
BEACON 3 (Esso)
SKF 28 (ball bearing grease)
CAUTION! Do not over lubricate bearings. Grease with hot bearing if possible, rotating slowly the fan by hand.
Excessive pressure caused by over lubrication may displace bearing grease seals or cause grease to overheat the
bearing, resulting in premature bearing failure.
If there is any irregular noise or clanging renew both bearings. In the case of extreme running conditions, lubricate in
accordance with the following recommendations.
WARNING! All above checks and operation shall be done first time after the 10 first working hours.
Maintenance
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