VCB-X Operator Interface SD
VCB-X CONFIGURATION
41
VCB-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 VCB-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 change schedules for
and
press
<ENTER>
. Once communication is established, “No Com-
munication” 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 Setpoints Screen shown below.
Setpoint Screen #1 - Occupied HVAC Cool/
Heat Setpoints
VCBX Spts ID 101
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
VCBX Spts ID 101
Hood On HVAC Spts
OAT Cool: 75.0
º
F
OAT Heat: 70.0
º
F
These setpoints are used for three different applications.
CAV/MUA Dual Mode (Hood On/Off)
—In CAV (Hood Off) operation,
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 setpoints 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.
