APPENDIX B: ELECTRICAL AND DATA CONNECTIONS
UNIFLOW
®
4 PULSED HEAT CONTROL
B-12 990-908
NOTE: The photos below are rotated 90° for clarity.
Timing: The force valve actuates when the first level of the foot switch is closed.
It automatically
de-activates when the COOL1 temperature is reached if there is not a Postheat process
cycle, or after the Head Up Delay if there is a Postheat process cycle, or in the event of a
reflow alarm.
The head cool valve is user-programmable to be ON or OFF. It is independent of the
reflow process cycle. It is used to prevent the thermocouple holder from overheating.
The solder cool valve is user-programmable to be ON or OFF. If the Profile does not have
a Postheat process cycle, selecting ON will activate the solder cool valve starting at the end
of the Reflow period and de-activating when the thermode reaches either the COOL1,
PREHEAT, or BASE temperature which ever is lower. If the Profile does have a Postheat
process cycle, selecting ON will activate the solder cool valve starting at the end of the
Reflow period and de-activate the valve when the thermode reaches the COOL1
temperature. The solder cool valve will also activate at the end of POSTHEAT and de-
activate when the thermode temperature reaches either the
COOL2, PREHEAT, or BASE
temperature which ever is lower. The solder cool valve is used to cool the hot thermode
quicker.
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