WattMaster WM-WCC3-TGD-01B - Manual (Page 330)

WCC III Technical Guide 4-20
4. SCUSCR.EXE SCREENS
Supply Air Mode:
There are three types of Supply Air Modes: Supply Air Cooling
Mode, Supply Air Heating Mode, and Supply Air Neutral Mode.
Supply Air Neutral Mode
This mode occurs when the Supply Air Temperature is between
the heating and cooling deadband amounts.
Supply Air Cooling Mode
This mode occurs when the Supply Air Temperature falls the
deadband amount below the space temperature. To cancel the
supply air cooling mode, the supply air temperature must rise to
within 2 ºF of the space temperature.
Supply Air Heating Mode
This mode occurs when the Supply Air Temperature rises the
deadband amount above the space temperature. To cancel the
supply air heating mode, the supply air temperature must fall to
within 2 ºF of the space temperature.
Space Temperature
This is the current temperature of the zoned area that the WCC3
VAVBOX III is controlling. It is listed in degrees Fahrenheit.
(Zone temperatures sensors WM Part# OE210, OE211, OE212,
or OE213) A duct sensor in the return air ducting may also be used
for return air control of the VAVBOX zone (WM Part# OE230 or
OE231).
Active Cooling Setpoint
This is the current cooling setpoint that the VAV BOX III software
is controlling to. This setpoint is dependent on “Occupied” or
“Unoccupied” conditions. It is listed in degrees Fahrenheit.
Active Heating Setpoint
This is the current heating setpoint that the VAV BOX III software
is controlling to. This setpoint is dependent on “Occupied” or
“Unoccupied” conditions. It is listed in degrees Fahrenheit.
Current Heat / Cool Demand
This is the current heating or cooling demand for the VAV Box
controller in degrees from the current setpoint. This current setpoint
could be the occupied cooling or heating setpoint or the unoccupied
cooling or heating setpoint. It is listed in degrees Fahrenheit.
Sensor Slide Adjust ….(Optional)
If the zone temperature sensor that is connected to the VAV BOX
controller is equipped with a Slide offset pot, (WM Part # OE212,
or OE213) for tenant comfort control of space temperature, then
this fi eld value will range from “0” to “5”, with 0 being disabled,
and 1, 2, 3, 4, and 5, being the degrees in Fahrenheit, both plus
and minus from the programmed heating or cooling setpoint
depending on the current mode of operation of the WCC3 VAV
BOX III controller.
EMS Effect on Setpoints
On a command from the WCC III – MCD central processor,
typically during peak load demand periods, the Terminal Unit
Controller (TUC-2R) will increase the cooling setpoint and also
decrease the heating setpoint by an amount programmed by the
system operator. The amount of increase/decrease that can be
programmed is 0-10 ºF.
Supply Air Temperature
This is used to determine if the main VAV system is in a heating or
cooling mode. VAV BOX zones so equipped with reheat can use
cool air and then “Reheat” it back up to temperature for desired
heating of the zone. These “reheated” zones are usually located
on the outer perimeter of a building’s heating or cooling needs.
This is because interior zones generally require cooling-only type
of control.
Discharge Air Temperature
If the VAV BOX is so equipped with a stage or multiple stages of
reheat, it can then affect the temperature output of the VAV BOX.
An input on the VAV BOX controller must then be used to measure
this outgoing temperature from the VAV BOX.
Airfl ow ….. {Pr. Indep. ONLY}
This is the current airfl ow calculation in CFM (Cubic Feet per
Minute).
Calculated Damper/Airfl ow
In pressure independent systems, you may want to have a set CFM
level in the zoned space.
VAV BOX III Status Screen