Quincy Compressor QSD 65040-AB, Instruction Manual, Page: 26 / 86

Section V - Preparing for Maintenance or Service
24
Quincy Compressor ® - QSD™
The following procedure should be used for maximum
safety when preparing for maintenance or service:
1)
Disconnect and lockout the main power switch and
hang a sign at the switch of the unit being serviced.
2) Close the manual shut-off valve (block valve)
between the receiver and plant air system to prevent
any back-up of air flow into the area to be serviced.
Never depend upon a check valve to isolate the
system.
3) Open the manual vent valve and wait for the pressure
in the system to be completely relieved before
starting service. DO NOT close the manual vent
valve at any time while servicing.
4) Shut off water and depressurize system if water-
cooled.
!
WARNING
Never assume the compressor is ready for
maintenance or service because it is stopped. The
automatic dual control may start the compressor
at any time. Death or serious injury could result.