VCC-X Operator Interface SD
VCC-X CONFIGURATION
29
Confi guration Screen #22 - Fan Proving
VCC-X Cnfg ID #
Fan Proving
NO
USE < or > TO CHANGE
Select YES if the unit is equipped with a Proof of Flow Switch and
it is connected to the VCC-X. If selected as YES and the Proof of
Flow Switch is open, only the Supply Fan Relay will be active. If
any other relays such as Heating Stages or Cooling Stages are ac-
tive, they will be deactivated when the Proof of Flow Switch input
is lost. Default is NO.
Confi guration Screen #23 - Fan Starting Delay
VCC-X Cnfg ID #
Fan Starting
Delay: -1s
[-1 = Unit Addr x 5]
Enter the number of seconds you want the fan to delay starting. This is
the Supply Fan Starting Delay initiated whenever the VCC-X initiates
Supply Fan operation upon going occupied or after power-up. This is
useful when you are using multiple VCC-X-controlled HVAC units and
want to be sure that all the units do not start at exactly the same time
when the Occupied schedule occurs. Each VCC-X should be set with
staggered Fan Starting Delay Setpoint values. When the -1 value is used,
it multiplies each VCC-X Controller’s address by 5 and uses this value
in seconds as the Fan Starting Delay. This provides a staggered start for
each VCC-X Controller on the system without having to individually set
each VCC-X Controller for its own time delay.
For an MUA unit, this
should be set to a minimum of 60 seconds to let the OA Damper
open.
Default is -1 second.
Description Minimum Default Maximum
Fan Start Delay Timer -1 Sec -1 Sec 240 Sec
Confi guration Screen #24 - Purge Mode Delay
VCC-X Cnfg ID #
Purge Mode
Delay: 30s
[ 0 - 900 Seconds ]
Enter the number of seconds you want the unit to stay in Purge Mode
before going into Occupied Mode. In Purge Mode, the fan runs with the
Economizer closed and all Cooling and Heating is de-energized.
For an
MUA unit, this should be set to 0 seconds to prevent a Purge Mode
(which is a damper closed operation).
Default is 30 seconds.
VCC-X Confi guration Screens
Confi guration Screen #25 - Heat Type
VCC-X Cnfg ID #
Heat Type
No Heat
USE < or > TO CHANGE
Default is No Heat. Available options are:
No Heat—The unit has no Heat.
Staged Only—On/Off Hot Water or fi xed stage(s) of Heat.
Mod Heat Only—Only fully modulating forms of Heat
which would be Modulating Hot Water or Steam Heat or
Modulating SCR Electric Heat. Does not include Modulating
Gas using the AAON
®
MODGAS-X Controller.
Modgas-x then Staged—Modulating Gas Heat
controlled by the AAON
®
MODGAS-X Controller as
1
st
form of Heat and Stage(s) of Heat as the 2
nd
form of
Heat.
Mod Heat then Staged—Fully modulating Heat as the
1
st
form of Heat and Stage(s) of Heat as the 2
nd
form of
Heat.
See the VCC-X Controller Technical Guide for a more information.
Confi guration Screen #26 - Modulating Heat
Output Signal
VCC-X Cnfg ID #
Mod Heat Volt Output
Min Pos Volts: 0.0
Max Pos Volts: 10.0
Enter a value between 0.0 and 10.0 VDC for the Modulating Heat
minimum and maximum output voltage. When performing reverse
acting heating, the minimum position volts will be the highest value.
Defaults are 0 VDC Min and 10 VDC Max.
Description Minimum Default Maximum
Minimum Position Volts 0 0 10
Maximum Position Volts 0 10 10
Confi guration Screen #27 - Cool Type
VCC-X Cnfg ID #
Cool Type
Refrigeration Module
USE < or > TO CHANGE
Default is Refrigeration Module. Available options are:
Refrigeration Module—A Refrigeration Module is
installed and confi gured.
Staged Only—On/Off Chilled Water or fi xed stage(s)
DX Cooling only and no Compressor Dehumidifi cation.
Mod Only— Modulating Chilled Water
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