Orion System OE392-10 System Manager TS - Manual (Page 41)

SMTS Technical Guide
VCM, VCM-X & VCB-X Controllers
41
VCB-X Controllers
VCB-X Temperature Setpoints
Space Sensor Slide Adjustment
If the VCB-X Controller has a Space Temperature Sensor with the Slide
Adjust option installed, the HVAC Mode Enable Heating and Cooling
Setpoints can be offset by the HVAC Mode Sensor Slide Offset Setpoint
value. When the Slide Adjust bar is in the middle, no offset will occur.
If the Slide Adjust bar is moved all the way to the top of the Sensor, the
Heating and Cooling Setpoints will be raised by the Setpoint value you
have entered. If the Slide Adjust bar is moved all the way down to the
bottom of the Sensor, the Heating and Cooling Setpoints will be lowered
by the Setpoint value you have entered.
If the Space Temperature is the SAT Reset Source, then the Slide Adjust
will adjust the HVAC Mode Enable Setpoints and the SAT Reset Source
Setpoints simultaneously. High limit = 10ºF / 5.5ºC; Low limit = 0ºF /
0ºC; Default = 0ºF / 0ºC.
Coil Setpoint Reset Limits
Based on the Indoor Humidity Reset Range confi gured with the Indoor
Humidity Low and High Reset Limits and the Coil Suction Temperature
Setpoint can be reset between the High Reset Limit and Low Reset Limit
confi gured on this screen during the Dehumidifi cation Mode. If the High
Reset Limit and the Low Reset Limit are set at the same value, no Coil
Temperature Reset will occur.
Coil Setpoint High Reset Limit
The Coil Temperature Setpoint can be reset to this maximum level when
the Indoor Humidity drops to its Low Reset Limit. See Reset descrip-
tion on page 46. If no reset of the Coil Temperature is required, set this
value the same as the following Coil Setpoint Low Reset Limit. High
limit = 70ºF / 21.1ºC; Low limit = 35ºF / -1.7ºC; Default = 45ºF / 7.2ºC.
Coil Setpoint Low Reset Limit
The Coil Temperature Setpoint can be reset to this minimum level when
the Indoor Humidity rises to its High Reset Limit. See Reset description
on page 46. If no reset of the Coil Temperature is required, set this value
the same as the above Coil Setpoint High Reset Limit. High limit = 70ºF
/ 21.1ºC; Low limit = 35ºF / -1.7ºC; Default = 40ºF / 4.4ºC.
Heat Wheel Defrost Temperature
The Heat Wheel Defrost Mode occurs when the Outdoor Air Temperature
is below this setpoint. High limit = 50ºF / 10ºC; Low limit = 0ºF / 0ºC;
Default = 30ºF /-1.7ºC.
Supply Air Cooling High Reset Limit
If No Reset has been confi gured for the SAT Reset Source, then this
setpoint will be the Cooling Mode Supply Air Setpoint. If a Reset Source
has been confi gured, then this setpoint will be the lowest temperature
the Supply Air Setpoint can be reset to. High limit = 80ºF / 26.66ºC;
Low limit = 30ºF / -1.11ºC; Default = 55ºF / 12.80ºC.
Supply Air Cooling High Reset Limit
If a SAT Reset Source has been confi gured, then this is the maximum that
the Cooling Mode Supply Air Setpoint can be reset up to. High limit =
100ºF / 37.77ºC; Low limit = 1ºF / -17.22ºC; Default = 55ºF / 12.80ºC.
Cooling Reset Source High Limit
If a SAT Reset Source has been confi gured, then the Cooling Mode
Supply Air Setpoint will be reset to its minimum limit (Supply Air
Cooling Setpoint) as the reset source rises to this level. If this unit has
been confi gured for Single Zone VAV operation, then the Supply Fan
VFD will be reset towards 100% as the Space Temperature rises towards
this setpoint. High limit = 150ºF / 65.55ºC; Low limit = 1ºF / -17.20ºC.
Default = 75ºF / 24ºC.
Cooling Reset Source Low Limit
If a SAT Reset Source has been confi gured, then the Cooling Mode Sup-
ply Air Setpoint will be reset to its maximum limit (Supply Air Cooling
Reset Limit) as the reset source drops to this level. If this unit has been
confi gured for Single Zone VAV operation, then the Supply Fan VFD
will be reset towards the Cooling Minimum Fan VFD Signal Setpoint
as the Space Temperature falls towards this setpoint. High limit = 150ºF
/ 65.55ºC; Low limit = -10ºF / -23.30ºC. Default = 70ºF / 21ºC.
Cooling Staging Window
When the VCB-X Controller is in Cooling Mode, if the Supply Air
Temperature drops below the Active Supply Air Cooling Setpoint mi-
nus the Cooling Staging Off Deadband value, a Cooling Stage will be
deactivated after its Minimum Run Time. High limit = 30ºF / 16.66ºC
(no offset); Low limit = 1ºF / 0.55ºC; Default = 5ºF / 2.8ºC.
Cooling Outdoor Air Lockout
If the Outdoor Air Temperature drops below this level, the Mechanical
Cooling is locked out. High limit = 100ºF / 37.77ºC; Low limit = -30ºF
/ -34.44ºC; Default = 50ºF / 10ºC.
Cooling Minimum Fan VFD Signal
If this unit is confi gured for Single Zone VAV operation, the Cooling
Minimum Fan VFD Signal will be the fan speed at which the VFD will
start operating at when cooling is initiated. It can then modulate up to
100% as the space temperature rises within the range created by the
Cooling Reset Source Low Limit and the Cooling Reset Source High
Limit. If this is a CAV unit this should be set to 100%. High limit =
100%; Low limit = 0%; Default = 30%.
Cooling Low Temperature Cutoff
The VCB-X controller will temporarily disable Cooling if while in Cool-
ing Mode, the Supply Air Temperature drops below this Cooling Low
Temperature Cutoff Setpoint. The unit will restart when the Supply Air
Temperature has risen 5º above this level. See the VCB-X Controller
Field Technical Guide for detailed information on the Low and High
Supply Air Temperature Cutoff sequence of operation. High limit =
100ºF / 37.77ºC; Low limit = 0ºF / -17.77ºC; Default = 40ºF / 4.50ºC.
Mod Cooling Proportional Window
The Modulating Cooling Window is the control range of the Modulating
Signal above and below the Active Supply Air Temperature Setpoint. The
larger the Modulating Cooling Window, the smaller the signal adjust-
ment per Time Period will be for each 1ºF the Supply Air Temperature
is from the Active Supply Air Temperature Setpoint. If the Supply Air
Temperature is this amount away from the SAT setpoint, 10% of the
possible output signal will be applied. High limit = 30ºF / 16.66ºC; Low
limit = .1ºF / .055ºC; Default = 10ºF / 5.55ºC.