Orion System RNE Modular Controller - Manual (Page 50)

Zone
Zone
INPUTS & OUTPUTS
RNE Modular Controller Field Technical Guide 50
RNE Controller Inputs
RNE Controller Inputs
AI1 - Space Temperature Sensor Input
If you want to generate Occupied or Unoccupied Heating and Cooling
demands based on Space Temperature, select this Sensor for the HVAC
Mode enable. The Space Temperature Sensor can be used for Night Set-
back control regardless of the HVAC Mode Sensor selected. If the Space
Temperature Sensor used is equipped with the optional Push-Button
Override Feature, this input will detect user overrides from Unoccu-
pied back to Occupied operation for a user-adjustable amount of time.
This Sensor is not required for Cooling Only HVAC units confi gured
for Supply Air Temperature control as the HVAC Mode Enable Sensor
unless Night Setback operation is required. The Space Temperature can
also be confi gured to reset the Supply Air Temperature Setpoint. The
Space Temperature Sensor is the only Sensor that can be used for Night
Setback operation during the Unoccupied Mode.
AI2 - Supply Air Temperature Sensor Input
The Supply Air Temperature Sensor is the default HVAC Mode Enable
Sensor. For typical VAV units that are Cooling Only with Morning
Warm-up, this Sensor should be confi gured as the HVAC Mode Enable
Sensor. Heating will only occur during Morning Warm-up. After Morn-
ing Warm-up expires, the Supply Air Temperature will be maintained
at the Supply Air Temperature Cooling Setpoint. The HVAC unit must
always have a Supply Air Temperature Sensor installed.
AI3 - 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 En-
able Sensor. The Return Air Temperature Sensor is also used to initiate
or cancel the Morning Warm-up Period on VAV-confi gured units. This
temperature must be at least 5°F above the Outdoor Air Temperature to
allow Economizer Cooling operation.
AI4 - 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. The Outdoor Air Temperature Sensor can also be
used to provide Low Ambient Temperature Protection in the building.
If the Outdoor Air Temperature is below the Low Ambient Temperature
Setpoint, the Preheat Relay Output will be maintained during Occupied
operation and will not be allowed to stage off unless the Supply Fan is
turned off. When using 100% (MUA Units) Outdoor Air applications,
the Outdoor Air Temperature Sensor should be confi gured as the HVAC
Mode Enable Sensor. The Outdoor Air Temperature Sensor is also used
in combination with the Outdoor Air Humidity Sensor for Dewpoint
calculations.
AI5 - Not Used
AI6 - Duct Static Pressure Sensor Input
This special phone jack-style input connection accepts a Duct Static
Pressure Sensor input modular cable. 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 Sup-
ply 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.
AI7 - Space Temperature Sensor Slide Adjust or
Remote SAT Reset Signal Input
AI7 on the RNE Controller is a dual-purpose input. It can be used for
the Space Sensor Slide Adjust option or for connection of the Remote
Supply Air Setpoint Reset Signal option. Only one or the other can be
used, not both.
Space Temperature Sensor Slide Adjust
If the Space Temperature Sensor being used has the optional Slide Ad-
just 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. The Slide Adjustment adjusts
whichever Temperature Sensor has been confi gured as the HVAC Mode
Enable Sensor, even if that Sensor is not the installed Space Temperature
Sensor.
If Space Temperature or Return Air 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.
Remote Supply Air Temperature Reset Signal
When a 0-5 VDC Remote Supply Air Temperature Reset Signal is to
be used, the controller must be confi gured for it, and the Room Sensor
Slide Offset setpoint must be set to zero for this option. If the slide offset
is not set to zero, the Supply Air Temperature Reset will not function.
The Remote Supply Air Temperature Reset signal must be confi gured
so that its setpoint will be at the coldest Supply Air Temperature, or 0
VDC, and so that its setpoint will be at the warmest Supply Air Tem-
perature, or 5 VDC.
The jumper AI7 must be set to 0-10V regardless of whether the control-
ler is confi gured for 0-5 or 0-10VDC operation. See the wiring diagram
on page 21 for details.
RNE Controller Outputs
AO1 - Economizer Control Signal
This voltage signal (2-10 VDC) is used to position the Outdoor Air
Damper during Economizer Control. It is also used to maintain the
Outdoor Air Damper at its Minimum Position during the Occupied
Mode when the Outdoor Air Temperature and/or Outdoor Humidity is
not suitable for Economizer Cooling purposes.
AO2 - Duct Static Pressure Control Signal
This voltage signal (0-10 VDC) can be connected to a Supply Fan VFD
or to Proportional Inlet Vanes to control the Duct Static Pressure. This
signal can also be connected to a 0-10 VDC Modulating Zoning Bypass
Damper Actuator to control Duct Static Pressure. When this signal is
used to control a Zoning Bypass Damper Actuator, the Zoning Bypass
Damper Actuator needs to be mechanically confi gured to close the Zon-
ing Bypass Damper on an increase of the 0-10 VDC output signal. This
is necessary because the signal is Direct Acting and is not confi gurable
as a Reverse Acting Signal on the RNE Controller.