Chemglass AF-0349 Welch Vacuum Pump - Manual (Page 5)

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Section 1: INSTALLATION
1.01 Unpacking
Carefully remove the pump from the shipping carton. Keep all paperwork and inspection tags for future reference.
If shipping damage has occurred, a claim must be filed with the carrier immediately; keep the shipping container for
inspection by the carrier.
1.02 Pump Mounting
Rubber bumpers are supplied with the pump base. They isolate noise and eliminate creeping. For more rigid
mounting requirements the pump base can be bolted directly to a surface by removing the bumpers from the base and
using the mounting holes and slots featured on the base.
1.03 Pump Location / Environmental Conditions
The pump should be located in a clean and well-ventilated area and adequate space should be provided wherever
possible for routine maintenance such as oil changes. For best performance, the pump should be located as closely
as possible to its system. Determining factors for pump location should include length and size of connections, the
number of bends, and the type of exhaust connections.
Altitude 2000m , Max.relative humidity of 80% for temperatures up to 31C decreasing linearly to 50% at 40C ,
Supply Voltage +/- 10% , Pollution Degree 2 , Installation Category II.
1.04 Exhaust Provisions
Exhaust connections will be determined by the type of system to be exhausted and the desired cleanliness of the air
surrounding the pump. Under normal pumping conditions the optional exhaust filter will be adequate. Refer to
Section 9, Accessories for available exhaust filters. Where extreme exhaust conditions are encountered, it is best to
pipe the exhaust out of the building. Always use thick walled rubber vacuum hose, wire reinforced PVC tubing or
metal pipe for exhaust lines to avoid the possibility of the line becoming crimped or collapsing resulting in dangerous
exhaust line blockage.
The exhaust connection is a 1”-20 threaded port for all Models except 8905 which is 3/4”-20. The port is located on
top of the oil reservoir. See section 9.02 Exhaust Filters to find the correct filter for each pump. If a hose nipple is
preferred for the exhaust port, use part number 1393K for models 8907, 8912 and 8917. Call Welch customer
support (847) 676-8800, ext. 1, prior to start-up if you have any questions.
WARNING
Never block or impede air flow from the exhaust port. High pressure
can build up within the oil reservoir if the exhaust port is blocked.
Check frequently, especially if exhaust is piped out of the building.