VCC-X Operator Interface SD
VCC-X SETPOINTS
41
VCC-X Setpoint Screens
Setpoints - General Procedures
Modular Service Tool Instructions
From any menu screen,
press
<SETPOINTS>
. The
Unit Selection
Screen,
shown below,
will appear requesting that you enter the unit
ID number.
Enter Unit Address
Then Press Enter
Selected Unit#: XXXX
No Communication
Enter
the correct unit ID number of the VCC-X Controller you want
to change Setpoints for and
press
<ENTER>
. Once communication
is established, “No Communication” will be replaced with “Press
Down.” Then
press
<
>
. You will then see Setpoint Screen #1.
Press
<ENTER>
to save entered data and
press
<
>
to scroll
through the screens.
NOTE:
If “No Communication” remains, it indicates a
communication failure to the controller.
System Manager SD Instructions
From any Main screen,
press
<SETPOINTS>
. The screen below
will appear because this option requires passcode clearance. Only
a Level 2 passcode can change setpoints.
THIS ACTION REQUIRES
PASSCODE CLEARANCE
Enter Passcode: XXXX
If the correct passcode was entered, the
Unit Selection Screen
will
be displayed.
Enter Unit Address
Then Press Enter
Selected Unit#: XXXX
No Communication
Enter the Unit ID of the controller you wish to search and
press
<ENTER>
. . Once communication is established, “No Communica-
tion” will be replaced with “Press Down.” Then
press
<
>
.
NOTE:
If “No Communication” remains, it indicates a
communication failure to the controller.
The following screen will be displayed:
Change Setpoints
Configure Unit
Save/Copy/Restore
Scroll to the ‘Change Setpoints’ option and
press
<ENTER>
. This
will take you to the
fi
rst Setpoint Screen shown below.
Setpoint Screen #1 - Occupied HVAC Cool/
Heat Setpoints
VCC-X Spts ID:#
Occupied HVAC Spts
Cooling: 75.0
º
F
Heating: 70.0
º
F
These Setpoints are used to determine the Heating, Cooling, or
Vent Mode of operation in CAV applications using the Space or
Return Air Temperature Sensor as the Mode Enable Sensor (HVAC
Source) or in Make Up Air (MUA) applications using the Outdoor
Air Temperature Sensor as the Mode Enable Sensor (HVAC Source).
Description
Minimum
Default
Maximum
HVAC Mode
Setpoints Cooling
1ºF
(-17.2ºC)
75ºF
(24ºC)
110ºF
(43.3ºC)
HVAC Mode
Setpoints Heating
1ºF
(-17.2ºC)
70ºF
(21ºC)
110ºF
(43.3ºC)
Setpoint Screen #2 - Hood On HVAC Setpoints
- OAT Cool, OAT Heat
VCC-X Spts ID:#
Hood On HVAC Spts
OAT Cool: 75.0
º
F
OAT Heat: 70.0
º
F
These setpoints are used for two different applications.
CAV/MUA Dual Mode (Hood On/Off)
—In CAV (Hood Off) opera-
tion, the unit will use the Occupied HVAC Setpoints from
Setpoint
Screen #1
in reference to a Space or Return Air Temperature Sensor.
When exhaust hoods are turned on and the Hood On contact closes,
the unit switches from CAV Space Temperature Control to MUA
Outdoor Air Temperature control operation (Hood On). At this point
the Outdoor Damper modulates to full open, and these Hood On set-
points become the Outdoor Air Temperature Mode Enable Setpoints.
When the exhaust hoods are turned off and the Hood On contact
opens, the unit reverts back to Space or Return Air Temperature
Control and uses the Occupied HVAC Setpoints from the previous
screen.
