VCC-X SETPOINTS
VCC-X Operator Interface SD
52
VCC-X Setpoint Screens
Heat Pump Defrost Interval is the length of time that must be met
between Defrost Modes. The length of this Defrost Interval can be
automatically adjusted by the Adaptive Defrost Interval Adjustment
described in
Setpoint Screen #44
.
Description
Minimum
Default
Maximum
Heat Pump Defrost Interval
10 Min
30 Min
120 Min
Setpoint Screen #44 - Adaptive Defrost
Interval Adjustment
VCCX Spts ID 101
Adaptive Defrost
Interval Adj: 0 Min
Once initiated, the Defrost Mode is active until the Defrost Coil
Temperature Switch opens or until a 10 minute timer has expired.
Enter a value greater than zero to enable the Adaptive Defrost
Adjustment of the Heat Pump Defrost Interval (
Setpoint
Screen
#43
). This adjustment value will be subtracted from the Heat Pump
Defrost Interval if the Defrost Mode lasts the entire 10 minutes. A
proportion of this adjustment value will be added to the Heat Pump
Defrost Interval if the Defrost Mode only lasts between 8 minutes
and 0 minutes.
Description
Minimum
Default
Maximum
Adaptive Defrost Adj.
0 Min
0 Min
30 Min
Setpoint Screen #45 - Heat Wheel Defrost
Temperature Setpoint
VCC-X Spts ID:#
Heat Wheel Defrost
Temp Setpoint: 30.0
º
F
The unit will go into Heat Wheel Defrost Mode when the Outdoor
Air is below this setpoint.
Description
Minimum
Default
Maximum
Heat Wheel Defrost
0ºF
(0
º
C)
30ºF
(-1.1
º
C)
50ºF
(10
º
C)
Setpoint Screen #46 - Morning Warm Up Max
Length & Target Temp
VCC-X Spts ID:#
Morning WarmUp
Max Length: 60 Min
Target Temp: 70.0
º
F
When the VCC-X is con
fi
gured for Morning Warm-up and the con-
troller enters the Occupied Mode, the VCC-X looks at the Return
Air Temperature to determine if the unit should initiate Morning
Warm-up Mode. If the Return Air Temperature is below the Morning
Warm-up Target Temperature and the Max Length is greater than
“0,” the VCC-X will initiate Heating. This is considered Morning
Warm-up and will run until the Return Air Temperature rises above
the Morning Warm-up Target Temperature or until the Max Length
Setpoint time expires.
Description
Minimum
Default
Maximum
Morning Warm Up
Max Length
0 Min
60 Min
240 Min
Morning Warm Up
Target Temp
50ºF
(10
º
C)
70ºF
(21
º
C)
90ºF
(32.2
º
C)
Setpoint Screen #47 - SZ VAV Integral
Constant
VCC-X Spts ID:#
SZ VAV Integral
Constant: 0
If the SZ VAV Fan Speed Control requires Integral control, enter
the Integral constant here.
Description
Minimum
Default
Maximum
SZ VAV Integral Constant
0
0
10
Setpoint Screen #48 - Return Air Bypass
Damper Factor Setpoint
VCC-X Spts ID:#
Return Air Bypass
Damper Factor
Setpoint: 40%
This setpoint is used when you have an EM1 Expansion Module
installed and con
fi
gured for Return Air Bypass Damper control. The
Return Air Bypass Damper Factor Setpoint is a percentage value
that is used to calculate the Return Air Damper position in relation
to the Return Air Bypass Damper position. This provides a method
for adjusting the air
fl
ow through the Return Air Bypass Damper.
Increasing this percentage increases the air
fl
ow through the Return
Air Bypass Damper by causing the Return Air Damper to move fur-
ther towards its closed position in relation to the Return Air Bypass
Damper moving towards its open position.
Description
Minimum
Default
Maximum
Damper Factor
0%
40%
100%
