Orion System VCC-X Controller - Manual (Page 49)

VCC-X Operator Interface SD
VCC-X SETPOINTS
49
Reverse Acting Building Pressure Control
• Outdoor Air Damper— If this option is confi gured,
the VCC-X will use the user-adjustable Economizer/
Outdoor Air Damper output signal (AOUT2 –
Economizer Control Signal) to maintain the Building
Pressure Setpoint. Whenever the Building Pressure
falls below the Building Pressure Setpoint by the
Deadband amount, the modulating Economizer Output
Signal will modulate the damper open to control to
the Building Pressure Setpoint. If the Building Pressure
rises above the Building Pressure Setpoint by the
Deadband amount, the damper will modulate towards
closed as it attempts to maintain the Building Pressure
Setpoint. When this option is selected, no Economizer
free cooling or CO
2
IAQ operation will be available.
• Supply Fan VFD – Contact WattMaster regarding this
Reverse Acting Building Pressure Control option. It
should not be used in most applications. If this option
is selected, the user-adjustable Supply Fan VFD Output
(AOUT1 on the VCC-X) will be used to control the
Supply Fan VFD to maintain the Building Pressure
Setpoint in similar fashion to the Outdoor Air Damper
control described above.
Description Min. Default Max.
Building Pressure Spt -0.20″ WG 0.02″ WG 0.20″ WG
Building Pressure
Deadband 0.01″ WG 0.01″ WG 0.10″ WG
Setpoint Screen #31 - OAT Lockouts -
Comp Cool/Comp Heat
VCC-X Spts ID:#
OAT Lockouts
Comp Cool: 50.0ºF
Comp Heat: 35.0ºF
The VCC-X will Lockout Compressor (Mechanical) Cooling and
Heat Pump Compressor Heating when the Outdoor Air Temperature
is below these Compressor Cool and Heat Lockout Setpoints.
Description Minimum Default Maximum
OAT Lockout
Compressor Cooling -30ºF
(-34.4 º C)
50ºF
(10 º C)
100ºF
(37.7 º C)
OAT Lockout
Compressor Heating -30ºF
(-34.4 º C)
35ºF
(1.6 º C)
100ºF
(37.7 º C)
Setpoint Screen #32 - OAT Lockouts - Heat
VCC-X Spts ID:#
OAT Lockouts
Heat: 90.0ºF
The VCC-X will Lockout Mechanical Heating when the Outdoor
Air Temperature is above this Setpoint.
Description Minimum Default Maximum
OAT Lockouts Heating -30ºF
(34.4 º C)
90ºF
(32.2 º C)
150ºF
(65.5 º C)
Setpoint Screen #33 - Supply Air Cutoffs -
Cooling/Heating
VCC-X Spts ID:#
Supply Air Cutoffs
Cooling: 40.0ºF
Heating: 150.0ºF
The VCC-X controller will temporarily disable Heating or Cooling
if while in Heating or Cooling Mode the Supply Air Temperature
rises above the Hi SAT Cutoff Heating Setpoint or falls below the
Lo SAT Cutoff Cooling Setpoint. See the VCC-X Controller Techni-
cal Guide for detailed information on the Low and High Supply Air
Temperature Cutoff sequence of operation.
Description Minimum Default Maximum
Cooling SAT Cutoff 0ºF
(-17.7 º C)
40ºF
(4.5 º C)
100ºF
(37.7 º C)
Heating SAT Cutoff 0ºF
(-17.7 º C)
150ºF
(65.5 º C)
250ºF
(121.1 º C)
Setpoint Screen #34 - Mod Heat Output
Position in Off Mode
VCC-X Spts ID:#
Mod Heat Output Pos
In Off Mode: 0%
This screen can be used to ensure that a Modulating Hot Water
Valve will open to a certain position when the fan is not operating
in order to prevent freezing. For other forms of Modulating Heat,
this would normally be set to 0%.
Description Minimum Default Maximum
Mod Heat Output
Position in Off Mode 0% 0% 100%
VCC-X Setpoint Screens