Greenheck RSF/RSFP (453148) - Manual (Page 3)

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number of turns open. Any increase in fan speed results in an increase in horsepower required for the motor. Motor load
amperes should always be checked and compared to nameplate rating when changing fan speed.
Direction of fan wheel rotation is critical. A fan wheel rotating in the wrong
direction will result in reduced airflow, motor overloading and possible burn-
out. Check wheel rotation by momentarily turning the fan on.
Rotation should be in the same direction as airflow at the outlet. See housing
and wheel examples in Fig. 3.
IMPORTANT NOTE: RSF/RSFP fans should be
operated only when attached to the completed system. Without proper
static pressure loading, the motor may be overloaded and burnout may
occur.
Routine Maintenance - See WARNING Page 2
To preserve the reliability and performance designed into the fan, regularly scheduled maintenance should be performed.
Items to be checked at each maintenance interval are filters, belts, bearings, fasteners, lubrication and removal of dust and
dirt.
Filters
1 inch washable aluminum mesh filters are standard on Model RSF and RSFP fans. (Optional 2 inch filters may be supplied
on some fans). Filters should be cleaned on a regular basis for optimum efficiency.
To remove the filters, first remove the fan cover by releasing the four latches. (Place the cover in an area where wind will not
blow it off the roof). The filters can be lifted out and washed in a mild detergent solution. If desired, an adhesive spray
available at most filter distributors can be applied to increase filter efficiency.
Belts
Belt tension should be checked two times during the first 24 hours of
operation and during each scheduled maintenance thereafter. Premature belt
failures are frequently caused by improper belt tension, either too tight or
loose. The proper belt tension for operating a V-belt is the lowest tension at
which the belt will not slip at peak load conditions. For initial tensioning, belt
deflection should be 1/64 inch for each inch of belt span, determined by using
moderate thumb pressure half way between pulley centers. For example, the
belt deflection should be 1/2 inch if the belt span is 32 inches (Fig. 4).
Belt tension can be adjusted by loosening the motor plate hinge bolts and
adjusting the jack screws as required. RSF/RSFP units are supplied with
either a painted steel motor bracket or a galvanized motor plate for larger
motor frames. To adjust belt tension on units equipped with the painted steel
motor bracket, simply adjust the single jack screw.
For units equipped with a galvanized motor plate, both jack screws must be adjusted equally. Check pulley and belt
alignment after adjusting belt tension (Fig. 2).
Lubrication
Fan bearings on Model RSF and RSFP are permanently lubricated. Motor bearings equipped with grease fittings should be
lubricated in accordance with instructions on the motor nameplate. Motors without grease fittings are lubricated for life.
Cleaning
Motors and Fan Wheels require periodic cleaning to remove dust and dirt which may accumulate. Motor cleaning should be
limited to the exterior surface only. Removing dust and dirt from the motor housing assists in motor cooling and prolongs
motor life. Motors should never be sprayed with steam, water or solvents.
Fan wheels which are left to accumulate dust and dirt will have poor air performance, loss of efficiency and possible
damaging vibration due to an unbalanced condition.
Periodic cleaning is a good investment in preserving the reliability and performance designed into the fan.
ROTATIO
N
R O TA
TI
O
N
Fig. 3
Belt Span
Deflection =
Belt Span
64
Fig. 4
AIRFLOW