Orion System System Manager TS II In-House - Manual (Page 47)

SMTS II Technical Guide
VCM, VCM-X & VCB-X Controllers
47
VCB-X Controllers
Economizer Control
Touch the radio button to select type of Economizer Control. Default is
None. Touch the square button to allow Economizer Control in Unoc-
cupied Mode. Default is No Economizer Allowed in Unoccupied Mode.

None— No Economizer being controlled directly by this
controller.
 
Economizer Only—
Economizer being controlled but no
CO
2
control.
 
Economizer with CO2 Reset—
Economizer controlled
but with the ability for CO
2
to reset the Minimum position.
 Economizer Allowed in Unoccupied Mode—
Default is
NO. This confi guration option is available if Economizer
Control is confi gured.

YES—
You want to use the Economizer as necessary
during Unoccupied Night Setback cooling calls. It will
be utilized just as it would be in the Occupied mode
with the same outdoor enable temperature. The
Economizer will remain closed unless there is
a call to run while in the Unoccupied Mode.

NO—
You want the Economizer to always remain fully
Closed in the Unoccupied mode even if there is a call
to run from a zone or space temp.
 Economizer Title 24 Option— Select this item if your unit has
Title 24 Economizer operation.
VCB-X Confi guration
Economizer Enable Source
This confi guration option is available if the unit was confi gured for
Economizer Control. Touch the radio button from the Economizer En-
able methods listed below that will allow the Economizer to be used as
the fi rst stage of cooling. Default is OA Drybulb.
 
OA Drybulb—
If the Outdoor Air Drybulb temperature is
below the enable setpoint, the Economizer can be used as
the fi rst stage of cooling.
 
OA Wetbulb ( OA RH sensor needed)—
If the Outside
Air Wetbulb temperature is below the enable setpoint, the
Economizer can be used as the fi rst stage of cooling.
 
OA Dewpoint ( OA RH sensor needed)— If the Outdoor
Air Dewpoint temperature is below the enable setpoint, the
Economizer can be used as the fi rst stage of cooling.
Building Pressure Control
This confi guration option is available if the EM1 Module has been
installed and confi gured. Touch the radio button to select type of Building
Pressure Control. Default is None.

None—
No Building Pressure Control by this controller.
 
On/Off Control— If the building pressure rises above
setpoint, a relay confi gured as Exhaust Fan will energize in
order to turn on an On/Off exhaust fan. You must confi gure
one of the output relays as Exhaust Fan.
 
Modulating Control— If the building pressure rises above
setpoint, a modulating signal will be used to control an
exhaust fan VFD or a modulating damper. A relay
confi gured as Exhaust Fan can be used to enable this device
so that the modulating signal can control it.
 
Reverse Acting OA Damper Control —Select if reverse
acting Building Pressure Control using the Outdoor Air
Damper is required. If the building pressure falls below
setpoint, the OA Damper (Economizer) signal will be used
to modulate the OA Damper to maintain setpoint.
 
Reverse Acting Supply Fan VFD Control
—Contact
WattMaster Factory regarding this reverse acting Building
Control option. This should not be used in most
applications.
Setpoints for Unit 0001 Configuration
Economizer Control
Page 12 of 19
None
Economizer Only
Economizer with C 2 Reset
Economizer Allowed in Unoccupied Mode
Economizer 24 Option
O
Figure 85: VCB-X Relay Confi guration Screen 12
Setpoints for Unit 0001 Configuration
Economizer Enable Source
Page 13 of 19
OA Drybulb
OA Wetbulb { Requires OA Humidity Sensor }
OA Dewpoint { Requires OA Humidity Sensor }
Figure 86: VCB-X Relay Confi guration Screen 13
Setpoints for Unit 0001 Configuration
Building Pressure Control
Page 14 of 19
None
On/Off Control
Modulating Control
Reverse Acting O/A Damper Control
Reverse Acting Supply Fan VFD Control
Figure 87: VCB-X Relay Confi guration Screen 14