Orion System System Manager TS II In-House - Manual (Page 52)

Zone
Zone
VCM, VCM-X & VCB-X Controllers
SMTS II Technical Guide 52
VCB-X Controllers
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%.
VCB-X Temperature Setpoints
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.
Supply Air Heating Setpoint
If No Reset has been confi gured for the SAT Reset Source, then this
setpoint will be the Heating 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 = 240ºF / 115.55ºC;
Low limit = 40ºF / 4.50ºC; Default = 120ºF / 48ºC.
Supply Air Heating High Reset Limit
If a SAT Reset Source has been confi gured, then this is the maximum
that the Heating Mode Supply Air Setpoint can be reset up to. High limit
= 250ºF / 121.11ºC; Low limit = 0ºF / -17.77ºC; Default = 120ºF / 48ºC.
Heating Reset Source High Limit
If a SAT Reset Source has been confi gured, then the Heating Mode
Supply Air Setpoint will be reset to its minimum limit (Supply Air Heat-
ing 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 the Heating Minimum Fan VFD Signal Setpoint as
the Space Temperature rises towards this setpoint. High limit = 150ºF /
65.55ºC; Low limit = 1ºF / -17.22ºC. Default = 75ºF / 24ºC.
Setpoints for Unit 0001
Cooling Staging Window
Cooling Low Temperature Cutoff
Mod Cooling Proportional Window
5
40
10
°F
Cooling Outdoor Air Lockout
Cooling Minimum Fan VFD Signal
50
60
°F
°F
°F
°F
Temperatures
Page 6 of 9
Figure 99: VCB-X Temperature Screen 6
Setpoints for Unit 0001
Supply Air Heating Setpoint
Heating Reset Source Low Limit
Supply Setpoint Reset Loop Rate
85
70
30
°F
Supply Air Heating High Reset Limit
Heating Reset Source High Limit
85
75
°F
°F
°F
°F
Temperatures Page 7 of 9
Figure 100: VCB-X Temperature Screen 7