Chemglass AF-0350 Welch Vacuum Pump - Manual (Page 3)

Section 1: INSTALLATION
1.1 Introduction
This manual has been complied not only for the care and maintenance of the DUOSEAL pump now in your
possession but as a helpful reference and guide for many problems which are usually associated with mechani-
cal vacuum pumps. Take time to read these instructions carefully and preserve this manual for future refer-
ence; we think it will be useful to you.
1.2 Unpacking
Carefully remove the pump from the shipping case and unfasten and remove the wooden skid. Preserve all
paper work and inspection tags for future reference. If damage has occurred from shipment a claim must be
filed with the carrier immediately; preserve the shipping container for inspection by the carrier. If you are
required to communicate with your dealer or with Welch Vacuum be sure to include your order numbers for
quick identification. Do not return the pump to the factory with out first calling for a returned goods number.
1.3 Pump Mounting
1.3a Mounted Pumps
Rubber bumpers are supplied with most of our mounted pumps, either loosely or attached. Bumpers are
excellent for applications involving a semi-flexible surface such as a bench top; they help to isolate noise and
eliminate creeping. For more rigid requirements, the pump base may be bolted directly to a firm foundation
with or without the bumpers. All DUOSEAL pumps should be mounted in a horizontal plane.
1.3b Unmounted Pumps
If you have purchased an unmounted pump, refer to parts list for information concerning the motor, motor
pulley and belt necessary to drive your particular pump at the recommended speed.
1.4 Pump Location
The pump should be located preferably in a clean and well ventilated area and adequate space should be
provided wherever possible for routine maintenance such as changes of oil and belt adjustments and replace-
ments. Above all, the pump should be located as closely as possible to its system in order to utilize it most
efficiently. Its location should include such determining factors as the length and size of connections, the
number of bends and the type of exhaust connections.
1.5 Exhaust Provisions (See Accessory section in back of this manual.)
Exhaust connections will be determined by the type of system to be exhausted and the desired cleanliness of
the atmosphere surrounding the pump. Under normal conditions of mild evacuation nothing more than the dust
cap will be necessary to cover the port. Where relatively high gas flows are involved or where the presence
of oil vapor is objectionable an exhaust filter may be fastened to the exhaust port in place of the dust cap. The
exhaust filters used on our pumps are capable of absorbing and restricting any vapor particle larger than 0.1
micron.
WARNING
Never block the exhaust port. If the exhaust port is blocked, pressure
will built-up in the pump with the potential of the pump body bursting
and causing possible injury to personnel in the area.
Where extreme exhaust conditions are encountered it is best to pipe the exhaust direct out of the building.
Welch recommended wire reinforced PVC, metal pipe or thick walled rubber hose be used as exhaust lines to
avoid potential of line becoming crimped or collapsing resulting in the exhaust port being clocked. Be sure to
call Welch technical service prior to start-up at 847-676-8800 if you have any questions.
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