4
WARNING
Never block the Exhaust Port.
If the exhaust port is blocked, pressure will build-up in the pump
with the potential of the pump body bursting and causing
possible injury to personnel in the area.
Section 1: INSTALLATION
1.10 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 mechanical
vacuum pumps. Take time to read these instructions carefully and preserve this manual for future reference; we
think it will be useful to you.
1.11
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 without firstcompleting the on-line request form for returned
goods authorization at www.welchvacuum.com.
1.12 Pump Mounting
1.121 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.
1.122 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.
1.13 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 replacements. 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.
1.14 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.
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.
