Product Manual

QP Series Quincy Compressor
2022201802, July 2014 31 3501 Wismann Lane, Quincy Ill. - 62305-3116
Belt Motor Pulley Recommended
Cross Dia. Range Deflection Force (lbs.)
Section (inches) Minimum Maximum
B 4.6 4.0 5.9
B 5.0 - 5.4 4.5 6.7
B 5.6 - 6.4 5.0 7.4
B 6.8 - 9.4 5.8 8.6
Step 2) Determine the amount of deflection ( in inches) required to mea-
sure de flection force (in pounds) by multi plying the span length
x
1
/
64
(.016) (i.e. 32” span length x
1
/
64
[.016] =
1
/
2
”[.50] of deflection
required to measure de flection force).
Step 3) Lay a straightedge across the top outer
surface of a drive belt from pulley to sheave.
Step 4) At the center of the span, perpendicu-
lar to the belt, apply pressure to the outer surface
of the belt with a belt tension gauge (refer to Fig.
5-2, Belt Tension Gauge). Force the belt to the
predetermined deflection (refer to Step 2 above).
Record the reading on the belt tension gauge and
compare to the chart following Fig 5-1. The de-
flection force reading should be within the mini-
mum and maximum values shown. Adjust belt(s)
accord ingly. New belts should be initially tensioned
to the maximum value plus 33% (multiply by 1.33).
Step 5) Recheck the tension of the new belts
several times in the first 50 hours of operation and
adjust if necessary. Thereafter, check belt tension
on a regular basis (refer to SECTION 5, Mainte-
nance Schedule).
Pressure Switch Adjustment
Pressure switches provided by Quincy Compressor
are pre-set at the factory and usu ally do not require
adjustment. However, the following procedures can
be performed by a qualified electrician to adjust
the pressure switch.
Step 1) Remove the pressure switch cover.
Step 2) While the compressor is running, screw
the spring loaded adjustment screw in (clockwise)
to increase the amount of air pressure required to
open the switch and stop the unit. Screw the spring
loaded adjustment screw out (counterclockwise)
to decrease the amount of air pressure required
to open the switch and stop the unit.
Pix 1067
Fig. 5-3 Pressure Switch
PRESSURE
ADJUSTMENT
SCREW
ELECTRICAL
CONTACTS
Fig. 5-2 Belt Tension Gauge
Pix 1153
POCKET CLIP
SLIDING
RUBBER O-RINGS
DEFLECTION
FORCE SCALE
(READ DOWN)
DEFLECTION
DISTANCE
SCALE
(READ UP)