MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H •
97
7.4.2.
OFAF Network Setup
OFAF networking allows multiple controllers to be linked together such that all of the freezers
will fill whenever any networked controller calls for a fill. When multiple freezers are connected
to a common supply source, it is advantageous to fill all freezers at the same time. LN2 transfer
losses are significantly reduced by filling all networked freezers while the supply system is
primed and cold. Using and OFAF network is more efficient than cooling the supply system
every time an individual freezer fills. This approach is also more efficient than employing a keep
full / keep cold system. Up to 100 TEC 3000 can be connected to an OFAF network.
An OFAF network can be configured in two modes: “Sequential” or “Simultaneous.” For both
modes, when any controller in the network initiates a fill, the Master controller (OFAF ID 1)
recognizes this and triggers all other controller to initiate fills as well.
In Sequential OFAF mode, once the controller that initiated the first fill has reached its High
Level Setpoint, the Master will trigger the freezer with the next sequential OFAF ID to fill until it
reaches its High Level Setpoint. The Master will then trigger the freezer with the next sequential
OFAF ID to fill and this process will continue until all freezers in the network including the
Master have reached their High Level Setpoints.
In Simultaneous OFAF mode, when any controller initiates a fill and fills for at least 60 seconds,
the Master will then broadcast a signal for all freezers, including itself, to begin filling. Each
freezer will continue to fill until its High Level Setpoint is reached.
A user would select sequential OFAF over simultaneous if their supply system is not able to
maintain the proper filling pressure while multiple freezers filling at the same time. Sequential
OFAF allows freezers to fill one at a time with a primed and cold supply system so that it is
easier for the system to maintain the proper filling pressure.
Figure 16:
Diagram showing differences between Sequential and Simultaneous OFAF
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