Technical Reference Manual-XPM3m Revision Date: August 2014
ASSOCIATED SUBSYSTEMS
TRUE N2 / AIR SWITCHING
TRUE N2 / AIR Switching is:
Standard on all NITROGEN ovens An option (NOT installed on all ovens)
On Nitrogen (N2) Reflow Ovens, the N2 / Air Automatic Switching Option permits switching from a Nitrogen to an
Ambient Air (room air, not compressed air) atmosphere.
DESCRIPTION
This configuration is for customers who want a nitrogen oven, but intend to run both air and nitrogen atmospheres.
The machine is set up to optimize nitrogen performance, minimize 02 levels, minimize N2 consumption, and
minimize tunnel maintenance.
APPLICATION
The True N2 / Air switching provides automated switching from the N2 Mode to Air Mode with all of the benefits of a
true air machine. Any application considering air operation to any extent should incorporate this option.
BENEFITS
In addition to the benefits of Nitrogen, this option offers the ability to run a true air process, with the benefits long
associated with air machines (economical gas flow, and continuously flushing cleanliness). Both modes are
controlled automatically by the selection in the recipe file.
FUNCTION
A series of valves are added to the individual cell intakes, the Controlled Exhaust, and the FFC manifold to allow
automatic control of gas flows in the machine.
N2 MODE-
Nitrogen flow to the machine automatically closes individual cell intake valves, closes the Air Controlled
Exhaust valve, and opens the Flux Flow Control manifold valve. In this configuration the machine functions
as the standard N2 FFC machine.
AIR MODE-
Upon closing the N2 solenoid, individual cell intake valves automatically open, the Controlled Exhaust valve
opens, and the FFC manifold valve closes (stopping gas recirculation). A valve on the far end of the FFC
manifold opens to allow air intake into the manifold. In this configuration the machine functions as an Air
machine
MAINTENANCE:
The True N2 / Air switching system requires minimal maintenance if operating properly, using recommended flows
settings, and periodic checks, as outlined in the operator manual. Periodic (every six months) inspection of the valve
cylinders and valve seats is recommended to insure proper operation. Nitrogen lines to the valves should be
checked for leaks.
To Next Page
Loading...
