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Brooks
VDM300 Vapor Delivery Module
®
3-4 Operation of BEST for VDM300
5. The user needs to ground Pin 14 of the DB-15 to start the Drain
mode. When the Drain mode is started the following takes place:
a. The water inlet valve will open for 1 minute to allow nitrogen
into the water tank. This will pressurize the tank to the pressure
level of the nitrogen supply (10-40 psig as required for proper
operation).
b. The drain valve will then open allowing the water to be pushed
out of the tank. When the tank is drained a short amount of time
will be allowed to keep pushing nitrogen through the tank. This
helps to ensure that as much water is drained from the tank as
possible.
c. When the process is complete in 5 to 7 minutes (typical), the
green "DEVICE READY" LED will blink, Pin 13 of the DB-15 will
oscillate at 1Hz, and both water valves will be closed.
6. When the green "DEVICE READY" LED blinks and Pin 13 of the DB-
15 oscillates at 1 Hz, the user needs to let Pin 14 of the DB-15 float
(remove ground) to end the Drain Mode.
As stated above, the Drain mode process typically takes 5 to 7 minutes.
This is dependent on the nitrogen supply pressure and the amount of
water in the tank when the Drain Mode is initiated.
All of the operations in Section 3 can be performed over the diagnostic port
using the BEST GUI. Please reference the Brooks Expert Support Tool Soft-
ware for Brooks Products manual (X-SW-BEST-eng).
Installation and Operation Manual
X-VAP-VDM300-eng
Part Number: 541B210AAG
October, 2018
3-5
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