Orion System VCC-X Controller - Manual (Page 51)

VCC-X Controller Technical Guide
INPUTS & OUTPUTS
51
VCC-X EM1 EXPANSION MODULE
Analog Input (Confi gurable 0-10 VDC)
1 Economizer Actuator Feedback (T3)
Analog Outputs (0-10 VDC)
1 Chilled Water (AOUT1)
2 Return Air Damper (AOUT2)
3 Return Air Bypass (AOUT3)
Binary Outputs (24 VAC)
1 Confi gurable Relay (R1)
2 Confi gurable Relay (R2)
3 Confi gurable Relay (R3)
4 Confi gurable Relay (R4)
5 Confi gurable Relay (R5)
Table 4: VCC-X EM1 Inputs & Outputs
VCC-X EM1 Input/Output Map & VCC-X Controller Inputs
VCC-X Controller Inputs
AI1 - Space Temperature Sensor Input
The Space Temperature Sensor will initiate Occupied Heating and
Cooling modes if the unit is confi gured for Space Temperature
control. It is always the sensor used to initiate Unoccupied Heating
and Cooling modes. If the Space Temperature Sensor used is
equipped with the optional Push-Button Override feature, this input
will detect user overrides and switch the unit from the Unoccupied
Mode back to the Occupied Mode operation for a user-adjustable
amount of time. The Space Temperature can also be confi gured to
reset the Supply Air Temperature Setpoint.
AI2 - Space Temperature Sensor Slide Adjust
If the Space Temperature Sensor being used has the optional Slide
Adjust feature, its AUX output is connected to this input. The Slide
Adjust control is used to vary the HVAC Mode Heating and Cooling
Setpoints by a user-confi gured maximum amount.
If the Space Temperature is confi gured as the SAT Reset Source, the
Slide Adjustment adjusts both the HVAC Mode Enable Heating and
Cooling Setpoints and the SAT Reset Source Heating and Cooling
Setpoints simultaneously by a user-confi gurable maximum amount.
AI3 - Supply Air Temperature Sensor Input
Once the unit is in the Heating or Cooling Mode (based on the
temperature at the mode enable sensor), the unit will control the
staging or modulation of the heating or cooling sources to maintain
a Heating or Cooling Supply Air Setpoint. The HVAC unit must
always have a Supply Air Temperature Sensor installed.
AI4 - Return Air Temperature Sensor Input
If you want to generate occupied Heating and Cooling demands
based on Return Air Temperature, select this Sensor as the HVAC
Mode Enable Sensor. The Return Air Temperature Sensor is also
used to initiate or cancel the Morning Warm-up Period on VAV-
confi gured units.
AI5 - Building Static Pressure Sensor Input
This Sensor is only required if you wish to confi gure the VCC-X
Controller for Building Pressure Control. Building Pressure
Control can be accomplished by using one of two main control
methods. One control method uses the 0-10 VDC signal to control
an Exhaust Fan VFD or an Exhaust Damper Actuator for Direct
Acting Pressure Control applications. In addition, for Reverse Acting
Pressure Control applications, it can control an Outdoor Air Damper
Actuator. The other available control method is to confi gure one of
the Output Relays as an Exhaust Fan output that will activate the
Exhaust Fan any time the Building Pressure is above the Building
Pressure Setpoint.
AI6 - Remote Supply Air Temperature Reset
Signal
If a Remote SAT Reset Signal is confi gured as the Reset Source, this
input can be used to accept a confi gurable voltage input between 0-10
VDC (Direct or Reverse Acting) to reset the Supply Air Temperature
Setpoint. See the Supply Air Temperature Reset section in the
Sequence of Operations for more details.
AI7 - Outdoor Air Temperature Sensor Input
The Outdoor Air Temperature is used to lock out Heating or Cooling
to conserve energy at whatever temperature you deem appropriate
for each Mode of Operation. This sensor is also used to initiate
Heating and Cooling modes on a Make Up Air unit. The Outdoor
Air Temperature Sensor can also be used for Pre-Heater operation
and for Low Ambient Protection operation.
NOTE: For AI1, AI3, AI4 & AI7, all Temperature Sensors
must be Thermistor Type III which provide 77.0°F
@ 10K Ohms Resistance.
AI8 - Duct Static Pressure Sensor Input
This phone jack-style input connection accepts a Duct Static Pressure
Sensor modular cable input. The Duct Static Pressure Sensor reading
is used to determine current Duct Static Pressure. This Static Pressure
reading is used to control the output signal supplied to the Supply Fan
VFD or Zoning Bypass Damper Actuator. If you have confi gured the
HVAC unit for Constant Volume operation, this Sensor is optional. If
it is installed on a Constant Volume unit, it will not affect operation,
but rather will be used as a status-only reading.