Quincy Compressor Climate Control Series Instruction Manual page 19

WARNING !
DANGER !
PRESSURE
ADJUSTMENT
SCREW
Fig. 3-9 Pressure Switch
Climate Control Series
2022209100, August 2018
Guards
All mechanical action or motion is hazardous in varying degrees and needs
to be guarded. Guards should be designed to achieve the required degree of
protection and still allow full air flow from the compressor sheave across the
unit. Guards shall be in compliance with OSHA safety and health standards
29 CFR 1910.219 in OSHA manual 2206 and any state or local codes.
Guards must be fastened in place before starting the compressor
and never removed before cutting off and locking out the main
power supply.
Check Valves
Check valves are designed to prevent back-flow of air pressure in the com-
pressed air system (air flows freely in one direction only). The check valve must
be properly sized for air flow and tempera ture. Do not rely upon a check
valve to isolate a compressor from a pressurized tank or compressed
air delivery system during main tenance procedures!
Manual Shutoff Valves
Manual shutoff valves block the flow of air pressure in either direc tion. This
type of valve can be used to isolate a receiver from a pres surized system,
provided the system is equipped with a pressure re lief valve capable of being
manually released. Shutoff valves must be equipped with a lockout feature
and always locked in a closed po sition when the unit is being serviced. A pres-
sure relief valve must be installed between the manual shutoff valve and the
compressor (refer to Fig. 3-10, Typical Drop Leg & Component Location).
Pressure Relief Valves
Pressure relief valves aid in preventing system failures by reliev ing system
pressure when compressed air reaches a set level. They are available in various
pressure settings to accommodate a range of applications. A check valve and
pressure relief valve are re quired in all QC Series compressor discharge lines.
Pressure relief valves are preset by the manufacturer and under no circum-
stances should the setting be changed by anyone other than the manufac turer.
Pressure relief valves are designed to protect compressed air
systems in accordance with ASME B19 safety standards. Failure to
provide properly sized pressure relief valves may cause property
damage, severe personal injury or even death.
ELECTRICAL
CONTACTS
17
Pressure Switch
The pressure switch detects the demand for com-
pressed air and allows the motor to start. When
the demand is satisfied, the unit stops. Pressure
switches provided by Quincy Compressor are
pre-set at the factory and usually 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.
Quincy Compressor