Orion System OE392-10 System Manager TS - Manual (Page 28)

VCM & VCM-X Controllers
SMTS Technical Guide 28
VCM & VCM-X Confi guration & Temperature Setpoints
Broadcast Outdoor Air to All Other Units
Select this item to broadcast the VCM-X’s Outdoor Air Temperature Read-
ing to other HVAC units on the local loop if they are not equipped with
their own Outdoor Air Temperature sensors. A network communications
device is needed in order for this feature to operate.
Broadcast Relative Humidity to All Other Units
Select this item if to have the VCM-X broadcast its Outdoor Air Humid-
ity reading to other HVAC units if they are not equipped with their own
Outdoor Air Humidity sensors. A network communications device is
required in order for this feature to operate.
Force Max Damper During Warm-Up & Night Heat
Select this item to ensure the VAV/Zone Controllers will drive their
dampers to the Max Airfl ow Damper Position during Morning Warm-up.
This is important to allow the proper amount of airfl ow for Heating in
the HVAC unit.
Force Fixed Damper During Warm-Up & Night Heat
Select this item to have all VAV/Zone controllers connected to this VCM-
X controller forced to their “Fixed Airfl ow” Position during the Morning
Warm-up Mode of operation. See the VAV/Zone controller Setpoint
Screens for setting of the “Fixed Airfl ow” position.
One HVAC Unit with Boxes on Multiple Loops
This selection allows other VAV/Zone controllers connected on additional
local loops to receive the required broadcasts. This is only allowed when
you have a single VCM-X controller with VAV/Zone controllers on
multiple loops. Other VCM-X or add-on devices may be connected, but
no other VCM-X with VAV/Zone controllers can be connected on the
system. Select this item to have real time, supply air, and main supply
fan and heating status broadcast to all local loops on the entire system,
not just the local loop the VCM-X controller is on. This is normally only
required if you have a large HVAC unit that requires more than the 58
VAV/Zone controllers normally allowed on the local loop.
Modulating Cooling Output
Select either a 0-10 VDC signal or 2-10 VDC signal to a Modulating
Cooling source such as a Chilled Water Valve or select a 1.5-5 VDC
signal to a Digital Compressor.
Modulating Heating Output
Select 0-10 VDC signal or 2-10 VDC signal to a Modulating Heating
source such as a Hot Water Valve or SCR Electric Heater.
Carbon Dioxide Sensor Scaling
If you have a CO
2
sensor installed on your system, select whether it is a
current (4-20 mA) sensor or a voltage (0-10 VDC) sensor. If you have a
communicating CO
2
sensor, select No Sensor Installed.
Refrigerant
Select whether your HVAC unit is using R-22 or R-410A refrigerant.
Airfl ow
Select each type of airfl ow sensor that you have installed on your system.
Temperature Setpoints
Touch the
< Temperatures>
button to access the
Temperature Setpoint Screens.
Cooling Mode Enable
This setpoint is used to determine the Cooling Mode of operation in
reference to the HVAC Mode Enable Sensor. If the Supply Air Sensor is
confi gured to be the HVAC Mode Enable, this Setpoint is used in conjunc-
tion with the Unoccupied Setbacks if equipped with a Space Temperature
Sensor. Above this temperature plus the deadband, the unit will switch
to Cooling Mode. High limit = 99ºF; Low limit = 1ºF; Default = 75ºF.
Heating Mode Enable
This setpoint is used to determine the Heating Mode of operation in
reference to the HVAC Mode Enable Sensor. If the Supply Air Sensor is
confi gured to be the HVAC Mode Enable, this Setpoint is used in conjunc-
tion with the Unoccupied Setbacks if equipped with a Space Temperature
Sensor. Below this temperature minus the deadband, the unit will switch
to Heating Mode. High limit = 90ºF; Low limit = 1ºF; Default = 70ºF.
Night Cooling Offset
During the Unoccupied Mode of Operation, this setpoint adjusts the
Cooling Mode Enable Setpoint up by this amount. If you do not want
Cooling to operate during the Unoccupied Mode, use the default setting
of 30°F for this setpoint. High limit = 30ºF (no offset); Low limit = 0ºF;
Default = 30ºF.
Night Heating Offset
During the Unoccupied Mode of Operation, this setpoint adjusts the
Heating Mode Enable Setpoint down by this amount. If you do not want
Heating to operate during the Unoccupied Mode, use the default setting
of 30°F for this setpoint. High limit = 30ºF (no offset); Low limit = 0ºF;
Default = 30ºF.
Occupied Deadband
The deadband is added to the Cooling Setpoint to generate a cooling
demand and is subtracted from the Heating Setpoint to create a heating
demand. High limit = 10ºF; Low limit = 0ºF; Default = 1ºF.
Coil Setpoint
During the Dehumidifi cation Mode, the VCM-X uses the calculated Coil
Temperature to activate DX Cooling based on this Dehumidifi cation Coil
Temperature Setpoint. The VCM-X uses a Suction Pressure Transducer to
read Suction Pressure (the Saturation Vapor Pressure of the refrigerant)
and converts this Suction Pressure reading to a Coil Temperature value.
This calculation is based on using R22 or R410A refrigerant only and
will not work with any other refrigerant. This setpoint determines the
number of compressor stages that need to be activated to maintain the
Dehumidifi cation Coil Temperature Setpoint. The Coil Temperature is
maintained at this setpoint during Dehumidifi cation. High limit = 70ºF;
Low limit = 35ºF; Default = 45ºF.
Temps