VAV Controller—Variable Air Volume (VAV) Controller 71
78F79F80FDownloading/Commissioning
We recommend that you connect the zone sensor prior to performing the
initial configuration download. Even if you do not permanently install the
zone sensor at this time, terminate the N2 Bus wiring and pull it back to the
equipment room location of the NCM or Companion System. Refer to
HVAC PRO for Windows User’s Manual (FAN 637.5) for upload features.
Downloading and commissioning via the Zone Bus requires the use of the
CBLPRO interface and a laptop or PC running the HVAC PRO for
Windows software. You can connect to the Metastat 6-pin connector or
directly at the controller. VAV140/141 models have a spare 6-pin
connector making it unnecessary to disconnect the Metastat or zone sensor
during download/commissioning. Communication rate is 1200 baud over
the Zone Bus.
HVAC PRO for Windows allows you to perform downloading and
commissioning over the N2 Bus. Because the communication rate is
9600 baud, performing downloading and commissioning over the N2 Bus
saves a great deal of time in loading the initial controller configuration files
and parameters into the controller prior to the balancing contractor’s final
testing.
To perform the downloading and commissioning process over the N2 Bus,
we recommend that you create a job file spreadsheet similar to the one
illustrated in the following table.
Table 31: Example File per N2 Trunk for Pressure Independent Job
Filename
N2
Address
Cooling
Min CFM
Cooling
Max CFM
Heating
Min CFM
Heating
Max CFM
Damper
Deadband
Size 8
1 300 800 300 300 80
Size 10
2 300 1200 300 300 120
You should develop a separate filename for each size box with a different
configuration style. For example, if the inlet is 8 inches in diameter,
“Size 8” would be a logical filename (Table 31). This allows you to have
your base set of requirements in place before you adjust the CFM setpoint
schedule per the mechanical prints.
Via Zone Bus
81F82F83FVia N2 Bus
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