Orion System OE392-10 System Manager TS - Manual (Page 40)

Zone
Zone
VCM, VCM-X & VCB-X Controllers
SMTS Technical Guide 40
VCB-X Controllers
Control Mode Low Alarm Offset
If the Temperature of the controlling sensor falls below the Occupied
Heating Setpoint by this amount during the Heating Mode, the controller
will generate a Low Control Temp Alarm. The unit must be confi gured
for Space Temperature Control, Return Air Temperature Control, or as a
Single Zone VAV unit for this alarm to be generated. High limit = 50ºF
/ 27.77ºC; Low limit = 0ºF / 0ºC; Default = 30ºF / 16.66ºC.
Hood On MUA Cooling Setpoint
If the Hood On switch closes, this is the Cooling Setpoint used to generate
the Cooling Mode based on the Outdoor Air Temperature. High limit
= 110ºF / 43.3ºC; Low limit = -1ºF / -17.2ºC; Default = 75ºF / 24ºC.
Hood On MUA Heating Setpoint
If the Hood On switch closes, this is the Heating Setpoint used to generate
the Heating Mode based on the Outdoor Air Temperature. High limit
= 110ºF / 43.3ºC; Low limit = -1ºF / -17.2ºC; Default = 70ºF / 21ºC.
MUA Outdoor Air Dewpoint Setpoint
On MUA confi gured units (100% or high percentage Outdoor Air units),
or if this is a unit in Hood On MUA operation, Dehumidifi cation will
be initiated if the Outdoor Air Dewpoint rises above this setpoint. High
limit = 80ºF / 26.6ºC; Low limit = 35ºF / 1.7ºC; Default = 55ºF / 12.8ºC.
Economizer Enable Setpoint
If an Outdoor Air Temperature Sensor is connected to the VCB-X and
the Outdoor Air Temperature falls below this Setpoint, the Economizer
can be used for Free Cooling. High limit = 80ºF / 26.66ºC; Low limit =
-30ºF / -34.44ºC; Default = 55ºF / 12.80ºC.
Pre-Heat Enable Temperature
For cold climates where freezing temperatures may be experienced, a
Pre-Heater relay output can be activated to control a preheater coil based
on the Outdoor Air Temperature to prevent freezing of Water Coils. One
of the VCB-X Relay Outputs must be confi gured for the Pre-Heater
control. When confi gured, any time the Outdoor Air Temperature falls
below the Preheat Setpoint (during Occupied or Unoccupied Mode)
and the HVAC unit’s fan is running, the Pre-Heater relay will activate.
High limit = 70ºF / 21.11ºC; Low limit = -30ºF / -34.44ºC; Default =
30ºF / -1.11ºC.
Low Ambient Temperature
Similar to the Pre-Heat Relay, a Low Ambient Relay can be confi gured
to energize anytime (during Occupied or Unoccupied Mode) the Outdoor
Air Temperature falls below this setpoint. The Low Ambient Relay,
though, can energize whether the fan is running or not. This could be
used to energize a boiler, for instance. High limit = 70ºF / 21.11ºC; Low
limit = -30ºF / -34.46ºC; Default = 30ºF / -1.11ºC.
Warmup Target Temperature
If the Return Air Temperature is below this value on a change to the
Occupied Mode, the unit will enter the Warm-Up Mode until this target
temperature is satisfi ed or times out (based on Warmup Mode Timeout
Period). High limit = 90ºF / 32.2ºC; Low limit = 50ºF / 10ºC; Default
= 70ºF / 21ºC.
Temps
 Broadcast Commands to VAV Boxes—
The VCB-X will
broadcast all applicable information and commands to the VAV
Boxes.
 Broadcast Building Pressure—
The VCB-X will broadcast
Building Pressure from this unit to any other unit requiring this
value.
Glycol Percentage for Water Source Heat Pumps
Select the percentage that applies to your unit.
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. Above this temperature
plus the deadband, the unit will switch to Cooling Mode. High limit =
110ºF / 43.3ºC; Low limit = 1ºF / -17.2ºC. Default = 75ºF / 24ºC.
Heating Mode Enable
This setpoint is used to determine the Heating Mode of operation in
reference to the HVAC Mode Enable Sensor. Below this temperature
minus the deadband, the unit will switch to Heating Mode. High limit
= 110ºF / 43.3ºC; Low limit = 1ºF / -17.2ºC. Default = 70ºF / 21ºC.
Unoccupied 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 set-
ting of 30°F / 16.66ºC for this setpoint. High limit = 30ºF / 16.66ºC (no
offset); Low limit = 0ºF / 0ºC; Default 30ºF / 16.66ºC.
Unoccupied 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 / 16.66ºC for this setpoint. High limit = 30ºF / 16.66ºC
(no offset); Low limit = 0ºF / 0ºC; Default = 30ºF / 16.66ºC.
Mode Selection Deadband
This Setpoint is added to and subtracted from the HVAC Mode Setpoints
to determine when the unit enters and leaves a mode of operation. High
limit = 10ºF / 5.55ºC (no offset); Low limit = 1ºF / 0.55ºC; Default =
0ºF / 0ºC.
Control Mode High Alarm Offset
If the Temperature of the controlling sensor rises above the Occupied
Cooling Setpoint by this amount during the Cooling Mode, the controller
will generate a High Control Temp Alarm. The unit must be confi gured
for Space Temperature Control, Return Air Temperature Control, or as a
Single Zone VAV unit for this alarm to be generated. High limit = 50ºF
/ 27.77ºC; Low limit = 0ºF / 0ºC; Default = 30ºF / 16.66ºC.
VCB-X Confi guration & Temperature Setpoints