Pressure Switch Adjustment - Quincy Compressor QT Series Instruction Manual

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Instruction manual (48 pages)

Table Of Contents

Table of Contents

POCKET CLIP

SLIDING

RUBBER O-RINGS

DEFLECTION

FORCE SCALE

(READ DOWN)

DEFLECTION

DISTANCE

SCALE

(READ UP)

Fig. 5-2 Belt Tension Gauge

PRESSURE

ADJUSTMENT

SCREW

Fig. 5-3 Typical Pressure Switch

WARNING !

* Full load amps (FLA) & Service Factor can be found on the motor nameplate.

QT/QTS Series

2022208700, September 2018

ELECTRICAL

CONTACTS

Electric power always exists inside the pressure switch whenever

the compressor package is connected to a power supply. Be careful

not to touch any electrical leads when adjusting the pres sure

switch.

Never exceed the designed pressure for the system or overload the

motor beyond its Maximum Amp Draw.

* Full Load Amps x Service Factor = Maximum Amp Draw

Never assume a compressor is safe to work on just because it

is not operating. It may be in the automatic stand-by mode and

may restart any time. Follow all safety precautions outlined in

SECTION 5, Stopping For Maintenance.

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 minimum

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,

Maintenance Schedule).