Onan UF Series Instruction Manual And Parts Catalog page 67

I N S T A L L A T I O N
REVERSING THE SCROLL. - The generator is shipped from the factory
with the blower scroll mounted for coun-
terclockwise rotation. The direction of rotation is determined while
looking at the end opposite the drive end. If a clockwise direction of
rotation is desired, the blower scroll position must be reversed. The
arrow which is printed on the scroll must be pointing in the direction
of the rotation of the generator shaft.
R O T A T I O N - C A S V I E W E D F R O M OPPOSITE TO DRIVE E N D ) .
C L O C K W I S E C O U N T E R C L O C K W I S E
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S C R O L L N ^ —
SCROLL T A B INDICATES ^
D I R E C T I O N OF
R O T A T I O N
FIG. 2 - BLOWER SCROLL
To reverse the scroll, remove only the scroll with screen attached,
turn it end for end and reinstall it so that the scroll will be at the
opposite end of the air outlet hole, as illustrated.
POLARIZING THE GENERATOR FIELD, - The field is polarized at the
factory. If rotation direction
is reversed (scroll reversed and leads properly connected) and voltage
does not automatically build-up the f i r s t time, "flash the field" to re-
polarize the generator.
Connect an ac voltmeter across the generator output, run the generator
in the desired direction, touch a battery positive (+) cable to generator
field lead F l , and the battery negative (—) cable to generator field lead
F2„ If the voltmeter does not indicate voltage build-up, a larger battery
or higher dc source may be required to k i l l the existing residual mag-
netism.