Orion System OE392-10 System Manager TS - Manual (Page 42)

Zone
Zone
VCM, VCM-X & VCB-X Controllers
SMTS Technical Guide 42
VCB-X Controllers
VCB-X Temperature Setpoints
Supply Air Heating Setpoint
If No Reset has been confi gured for the SAT Reset Source, then this
setpoint will be the Heating Mode Supply Air Setpoint. If a Reset Source
has been confi gured, then this setpoint will be the lowest temperature
the Supply Air Setpoint can be reset to. High limit = 240ºF / 115.55ºC;
Low limit = 40ºF / 4.50ºC; Default = 120ºF / 48ºC.
Supply Air Heating High Reset Limit
If a SAT Reset Source has been confi gured, then this is the maximum
that the Heating Mode Supply Air Setpoint can be reset up to. High limit
= 250ºF / 121.11ºC; Low limit = 0ºF / -17.77ºC; Default = 120ºF / 48ºC.
Heating Reset Source High Limit
If a SAT Reset Source has been confi gured, then the Heating Mode
Supply Air Setpoint will be reset to its minimum limit (Supply Air Heat-
ing Setpoint) as the reset source rises to this level. If this unit has been
confi gured for Single Zone VAV operation, then the Supply Fan VFD
will be reset towards the Heating Minimum Fan VFD Signal Setpoint as
the Space Temperature rises towards this setpoint. High limit = 150ºF /
65.55ºC; Low limit = 1ºF / -17.22ºC. Default = 75ºF / 24ºC.
Heating Reset Source Low Limit
If a SAT Reset Source has been confi gured, then the Cooling Mode Sup-
ply Air Setpoint will be reset to its maximum limit (Supply Air Heating
Reset Limit) as the reset source drops to this level. If this unit has been
confi gured for Single Zone VAV operation, then the Supply Fan VFD
will be reset towards the Heating Maximum Fan VFD Signal Setpoint
as the Space Temperature falls towards this setpoint. High limit = 150ºF
/ 65.55ºC; Low limit = -10ºF / -23.3ºC. Default = 70ºF / 21ºC.
Supply Setpoint Reset Loop Rate
If you selected Space, Outdoor Air Temperature, Return Air Temperature,
or Fan VFD Signal as the SAT Reset Source, enter a value in seconds
between 1-255. This value determines how fast the Supply Air Tempera-
ture Setpoint is adjusted as the Reset Source changes. High limit = 255
seconds; Low limit = 1 second; Default = 30 seconds.
Heating Staging Window
When the VCB-X Controller is in Heating Mode, if the Supply Air
Temperature rises above the Active Supply Air Heating Setpoint plus the
Heating Staging Off Deadband value, a Heating stage will be deactivated
after its Minimum Run Time. High limit = 30ºF / 16.66ºC (no offset);
Low limit = 1ºF / 0.55ºC; Default = 5ºF / 2.80ºC.
Heating Outdoor Air Lockout
The VCB-X controller will Lockout Mechanical Heating when the
Outdoor Air Temperature is above this Setpoint. High limit = 150ºF /
65.55ºC; Low limit = 35ºF / 1.66ºC; Default = 90ºF / 32.2ºC.
Heating Minimum Fan VFD Signal
If this unit is confi gured for Single Zone VAV operation, and you have
a modulating heat source that will allow VAV heating, then the Heating
Minimum Fan VFD Signal will be the fan speed at which the VFD will
start operating at when heating is initiated. It can then modulate up to
the Heat Mode Maximum Fan VFD Signal as the Space Temperature
falls within the range created by the Hi Space Setpoint and the Low
Space Setpoint. If this is a CAV unit or a Single Zone VAV unit that
will have CAV Heating, these setpoints should both be set at the same
value which represents the constant speed you want the fan to operate
at during the Heating Mode.
On a unit controlling to a Duct Static Pressure Setpoint, if the Supply
Fan VFD Signal falls below this setpoint in the Heating Mode, Heating
will be disabled.
Minimum Signal High limit = 100%; Minimum Signal Low limit =
0%; Default = 50%.
Heating High Cutoff Temperature
The VCB-X controller will temporarily disable Heating if while in Heat-
ing Mode, the Supply Air Temperature rises above this Heating High
Temperature Cutoff Setpoint. See the VCB-X Controller Field Technical
Guide for detailed information on the Low and High Supply Air Tem-
perature Cutoff sequence of operation. High limit = 250ºF / 121.11ºC;
Low limit = 0ºF / -17.77ºC; Default = 150ºF / 65.50ºC.
Mod Heating Proportional Window
The Modulating Heating Window is the control range of the Modulating
Signal above and below the Active Supply Air Temperature Setpoint. The
larger the Modulating Heating Window, the smaller the signal adjust-
ment per Time Period will be for each 1ºF the Supply Air Temperature
is from the Active Supply Air Temperature Setpoint. If the Supply Air
Temperature is this amount away from the SAT setpoint, 10% of the
possible output signal will be applied. High limit = 30ºF / 16.66ºC; Low
limit = .1ºF / .055ºC; Default = 10ºF / 5.55ºC.
Mod Heating Unoccupied Position
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 nor-
mally be set to 0%. High limit = 100%; Low limit = 0%; Default = 0%.
Heat Pump Outdoor Air Lockout
If the Outdoor Air Temperature is below this value, the Heat Pump
Compressor heat will be disabled. High limit = 100ºF / 37.77ºC; Low
limit = -30ºF / -34.44ºC; Default = 35ºF / 1.6ºC.