WattMaster VAVBOX - Manual (Page 13)

VAVBOX Controller
Technical Guide
13
Initialization
On system power-up, the SCAN LED is extinguished for a few seconds
and then the controller “flashes” its address switch setting. If the ad-
dress switch were set to 7, you would see 7 flashes. After the address is
finished, the LED will extinguish for another 5 seconds. At the conclu-
sion of this 5 second delay, the LED will begin a continuous flashing
while the Damper Feedback limits are calibrated. If the Damper is driv-
ing open, the LED will blink slowly. If the Damper is driving closed,
the LED will blink fast. When the calibration is completed, the normal
diagnostic flashes will commence. These diagnostic flashes are described
later in this document.
VAVBOX Configuration & Setup
There are a few configuration selections available to the user, which
can be used to tailor the software operation to match the mechanical
equipment this controller is installed on. These are programmed using
either the Modular System Manager, Modular Service Tool or a per-
sonal computer with Prism computer front end software installed. See
the Operator Interfaces Technical Guide or the Prism Computer Front
End Software manual for specific programming information.
General
Several options are available to configure the VAVBOX controller for
the appropriate equipment it is installed on. All of these options can be
set from the “Configuration” menu with the exception of “AHU Heat
Call” which is set from the “Setpoints” menu. Again, please refer to the
Operators Interface Technical Guide or the Prism Computer Front End
Software manual for detailed programming information.
Box Control Method
Set this configuration item for the type of box the VAVBOX controller
is used on. The options available are:
0 = Cooling Only Box (With Reheat if Required)
1 = Heating/Cooling Changeover Box
2 = Series Fan Powered Box With Reheat
3 = Parallel Fan Powered Box With Reheat
Damper Operating Mode
This allows the user to set the direction of rotation the damper moves
when driving towards its full open position. The options available are:
0 = Direct Acting (Clockwise To Open Damper)
1 = Reverse Acting (Counterclockwise To Open Damper)
Pressure Independent Boxes - Airflow @ 1” W.C.
If this is a pressure independent box, this option allows you to calibrate
the box CFM correctly using the box manufacturers “K” factor. Enter
the correct “K” (CFM) factor for the inlet diameter of the box you are
configuring.
Expansion Relays - Steps of Reheat
If the box has reheat supplied by an electric coil, this option must be set
for the number of electric heating stages on the box. If the box has hot
water heat with a 2 position hot water valve, set the number of stages to
“1”. For hot water heat with a proportional hot water valve this must be
set for “0”.
Options available are:
0 = No Staging
1 = 1 Stage of Reheat
2 = 2 Stages of Reheat
3 = 3 Stages of Reheat
Proportional Heating Signal
If the box has hot water reheat using a proportional hot water valve, set
this option to match the voltage signal required by the hot water valve
you are using. Options available are:
0 = 0-10 VDC Voltage Signal
1 = 2-10 VDC Voltage Signal
Allow Box Heat With AHU Heat
If the box you are using has reheat, configuring this setting to 1=Yes
will allow the box heat to operate at the same time as the HVAC unit
heat. Options available are:
0 = No
1 = Yes
Main Fan Status
If the VAVBOX controller is installed on a non-fan powered box that
has reheat set this option to “Yes” in order to enable box reheat only
when the HVAC unit fan is running. A full description of how this
setting affects the various box types in the occupied and unoccupied
modes is contained under the “Mode Sequence” heading that follows
later in this manual. Options available are:
0 = No Heat can operate without fan
1 = Yes Heat cannot operate without fan
Push Button Override Group ID#
During Unoccupied Mode, all VAVBOX controllers with a correspond-
ing Group ID# will resume Occupied operation whenever any of the
VAVBOX controllers with the same Group ID # has it’s push-button
depressed to initiate an override condition. This allows you to group
zones in various areas of the building. For example, individual tenants
with several offices could restore occupied mode for just their zones
and not affect other zones in the building. If you don’t want a specific
zone to be a part of any group, enter a ‘0’ for its Group ID #.
Dump Zone
If this VAVBOX controller is to be used as a “Dump Zone” set this
configuration to 1=Yes. The dump zone is a controller without an ac-
tuator that is used to control a duct heater or auxiliary heat. Options
available are:
0 = No
1 = Yes
AHU Heat Call
This setting is located under the “Setpoints” menu on screen #3. This is
used only for the unoccupied mode. This temperature setpoint is used
to allow auxiliary heat such as baseboard heaters to be energized in an
attempt to satisfy the heating demand prior to initiating the HVAC unit
Supply Air Heating mode.
Sequence Of Operations