Operator Interfaces
Technical Guide
13
Configuration Screen #5
WMVAV Config ID 59
Proof of Flow Switch
Installed: No
[0=NO 1=Yes]
If you need proof of airflow before allowing any heating or cooling
stages to operate, install a differential pressure switch with a contact
closure that is connected to analog input #7 and select this option. If
this option is not selected, the WMVAV controller assumes there is ad-
equate airflow anytime the fan is running and ignores this signal.
Configuration Screen #6
WMVAV Config ID 59
OA Humidity Sensor
Installed: No
[0=NO 1=Yes]
If your economizer control requires the use of the Wetbulb Temperature
to enable or disable it, you must install a humidity sensor on analog
input #5 and select this option. If you require the Remote Signal to
determine the occupied mode of operation, you will need to move the
remote signal to Input #2 on the Analog Input Expansion Board.
Configuration Screen #7
WMVAV Config ID 59
Dehumidification
Installed: No
[0=NO 1=Yes]
You can monitor a wet contact closure on the first binary input on the 4
Binary Input expansion board and whenever it closes, the Gas Reheat
relay will be activated. This assumes you are in a cooling mode. The
Gas Reheat does not activate if the WMVAV controller is in the heating
mode. The option is only available on units that are configured for Con-
stant Volume Mode. If you are controlling static pressure (VAV Mode)
then this option is ignored.
Configuration Screen #8
WMVAV Config ID 59
Relief Pr. Control
Installed: No
[0=NO 1=Yes]
If you need to control building pressure, select this option by entering a
‘1’ and connect the Relief Pressure Sensor to the Analog Expansion
Input #4. The Relief Fan VFD Signal is also found on the Analog Input
Expansion module as the only analog output on that board.
Configuration Screen #9
WMVAV Config ID 59
Relief Pr. Control
Reverse Acting: No
[0=NO 1=Yes]
The Relief Pressure Control described in the previous paragraph can be
configured for reverse acting operation by setting this selection to “Yes”.
With the standard configuration (“No”) a relief fan VFD and/or Ex-
haust Damper would modulate towards its maximum high speed and/or
open position to decrease building pressure. If you select reverse acting
operation (“Yes”) on a decrease in building pressure the HVAC unit OA
damper would be modulated towards its maximum open position to
increase building pressure.
Configuration Screen #10
WMVAV Config ID 59
Reset Setpoint Using
Input Voltage Signal
Press “0” To Change
Press the “0” key to select the desired method of resetting the Cooling
and Heating Mode Supply Setpoint and the third line of the display
will change text to show what type of method has been selected to con-
trol the Reset Setpoint. Available selections are:
Input Voltage Signal
Outdoor Air Sensor
Space Sensor
Fan VFD Percentage
Local Analog Value
Return Temp Sensor
Configuration Screen #11
WMVAV Config ID 59
CO2 Sensor Installed
Sensor Type: 0
[0=NONE 1=ma 2=vdc]
You can install a CO
2
Sensor on this HVAC unit to monitor the Carbon
Dioxide levels and/or to provide for Indoor Air Quality (IAQ) control.
If you just want to monitor the level, enter the same Maximum Econo-
mizer Position that you set for the Minimum Position and it will not be
reset as the CO
2
level increases. If you do want IAQ control, set the
desired Maximum Economizer Position to reset up to during high lev-
els of CO
2
. The factory supplied sensor provided for the CO
2
readings is
a 0-10 VDC, 0 to 2000 PPM sensor. Be sure you enter a “2” if you are
using the default sensor.
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