WattMaster WCC II - Manual (Page 186)

Section 3: Screen Descriptions
WCC II Operator’s Guide
Operator Interfaces 3-154
Ver.: 01.00
The version of software within the TUC-VR is automatically
displayed here.
Description: [Rm 100]
You may enter a message to help you remember what area or what
piece of equipment is served by this particular TUC-VR.
Current Status:
1. Space Temperature: 76 °F 2. Setpoint: 74 °F
3. Airfl ow: 0 CFM
4. Duct Temperature: 0 °F
5. Direct Action 6. Occupied
7. EMS Control 8. Hot Water Valve Position: 0%
The ECC/WCC II system automatically displays the current space
temperature, temperature setpoint, airfl ow, duct air temperature
(if the duct sensor is connected to the TUC-VR), present control
mode - either Direct or Reverse as selected from the EA Driver
Screen, Occupied/Unoccupied control mode as selected from the
EA Driver Screen, EMS or local control, and the percent open
position of the modulating hot water valve.
Local Control when GB 0 is ON
When the global binary (GB1-255) entered here takes a value of
ON, the TUC-VR will operate according to its local set mode;
otherwise it will operate in the EMS mode.
When EMS is the control mode, the TUC-VR will receive all of
its setpoints from the ECC/WCC II front end computer. The space
temperature setpoint comes from the EA Driver Screen, and the
auxiliary setpoint along with the minimum and maximum air fl ow
setpoints comes from either the Occupied or Unoccupied inputs on
the TUC-VR Setup Screen.
When “Local” is selected, the TUC-VR will use the setpoint on the
space temperature sensor (default value = 74 °F for 4-wire fl ush
mount sensor) for zone control. The auxiliary setpoint along with
the minimum and maximum air fl ow setpoints comes from the
“Local Set” inputs on the TUC-VR Setup Screen.
Air fl ow rate at 2 in.
(50.8 mm) w.g.: [1000] [CFM]
Input the air fl ow rate consistent with the selected units (usually
cubic feet per minute) when the velocity pressure signal at the
TUC-VR is at 2 inches of water column. You need to know the
characteristics of the particular velocity probe used before you
can input the correct information. For example, the Tempmaster
velocity probe amplifi es the pressure signal by a factor of
approximately 1.4. Therefore, an actual velocity pressure of 1.43
inches will be seen as 2.0 inches at the TUC-VR.
Normally, the VAV box manufacturer will provide a graph or chart
which shows the CFM through the different size VAV boxes at
various velocity pressures.
The choices for the air fl ow units are shown below:
[Cubic feet/min, Cubic meters/hour, liter/second]
To select the desired units, place the cursor over this fi eld and
press the
once for each choice until the desired units
appear; then press .
Occupied Unoccupied Local Set
Maximum airfl ow
(EMS set)
60% 50% 60%
Minimum airfl ow
(EMS set)
20% 0% 20%
Aux. fan setpoint
(Parallel)
30% 30% 30%
Aux. reheat
setpoint diff.
4 F 24 F 4 F
Occupied, Unoccupied, Local Set
The control schedule for the TUC-VR is determined by the
“Schedule Selected by” input on the EA Driver Screen for this
TUC-VR. When the Occupied mode is selected at the EA Driver
Screen, the TUC-VR uses the Occupied mode setpoints, etc.
Maximum airfl ow (EMS set): 60%
The maximum amount of air to be delivered by the terminal unit is
entered in terms of “% of air fl ow at 2 inches.” The sample screen
shows 1000 CFM at 2 in. w.g. and a maximum air fl ow setpoint
of 60%. This means that when the space calls for full cooling, 600
CFM will be delivered by the VAV box.
Minimum Flow Setpoint
The minimum amount of air to be delivered by the terminal unit is
entered in terms of “% of air fl ow at 2 inches.” The sample screen
shows 1000 CFM at 2 in. w.g. and a minimum air fl ow setpoint of
20%. This means that when the space calls for full heating, 200
CFM will be delivered by the VAV box.