Orion System System Manager TS II In-House - Manual (Page 34)

VCM & VCM-X Controllers
SMTS II Technical Guide 34
Cooling High Reset Source
As the Reset Source Temperature rises to this level, the Supply Air
Setpoint drops to its minimum setting (Cooling SAT/Low Reset Limit
Setpoint). If doing VFD Reset in a Single Zone VAV application, this
Space Temperature will cause the VFD to modulate toward its 30%
minimum. High limit = 200; Low limit = 0; Default = 75.
Cooling Low Reset Source
As the Reset Source Temperature drops to this level, the Supply Air
Setpoint rises to its maximum setting (Cooling SAT/High Reset Limit
Setpoint). If doing VFD Reset in a Single Zone VAV application, this
Space Temperature will cause the VFD to modulate toward 100%. High
limit = 200; Low limit = 0; Default = 75.
Heating High Reset Source
As the Reset Source Temperature rises to this level, the Supply Air
Setpoint drops to its minimum setting (Heating SAT/Low Reset Limit
Setpoint). If doing VFD Reset, the Space Temperature will cause the
VFD to modulate toward its 50% minimum. High limit = 200; Low
limit = 0.; Default = 70.
Heating Low Reset Source
As the Reset Source Temperature drops to this level, the Supply Air
Setpoint rises to its maximum setting (Heating SAT/High Reset Limit
Setpoint). If doing VFD Reset, the Space Temperature will cause the VFD
to modulate toward 100%. High limit = 200; Low limit = 0; Default = 70.
Reset Interval Rate
This is the rate at which a new Supply Setpoint is calculated if a Reset
Source has been selected. This value determines how fast the Supply Air
Temperature Setpoint is adjusted as the Reset Source changes. High limit
= 250 seconds; Low limit = 1 second; Default = 20 seconds.
Reserved (VCM-X, VCM-X Modular, VCM-X WSHP) or
Low OAT Reset Limit (VCM)
The Supply Setpoint proportionally resets to its maximum setting as the
Outdoor Air Temperature drops to this low reset temperature. For VCM-
X, this fi eld will display Reserved. High limit = 100ºF; Low limit = 0ºF
Reserved (VCM-X, VCM-X Modular, VCM-X WSHP)
or High OAT Reset Limit (VCM)
The Supply Setpoint proportionally resets to its minimum setting as the
Outdoor Air Temperature rises to this high reset temperature. For VCM-
X, this fi eld will display Reserved. High limit = 100ºF; Low limit = 0ºF
Heat Wheel Defrost
The Heat Wheel Defrost Mode occurs when the Outdoor Air Temperature
is below this setpoint. High limit = 50ºF; Low limit = 0ºF; Default = 30ºF.
VCM & VCM-X Temperature Setpoints
Figure 53: VCM-X Temperature Setpoints Screen 5
Figure 54: VCM-X Temperature Setpoints Screen 6
Figure 55: VCM-X Temperature Setpoints Screen 7
Heat Pump Defrost Temperature
If the Coil Temperature is below this value, the Defrost Mode is acti-
vated if the Heat Pump Defrost Interval is satisfi ed. High limit = 50ºF;
Low limit = 0ºF; Default = 30ºF. (This setpoint is only available if your
unit has this feature.)
Heat Pump Defrost Interval
The Heat Pump Defrost Mode can only occur this often when the Coil
Temperature is below the Defrost Temperature Setpoint. High limit = 90
minutes; Low limit = 10 minutes; Default = 30 minutes. (This setpoint
is only available if your unit has this feature.)
Defrost Adaptive Timer (VCM-X Modular)
Enter a value greater than zero to enable the Adaptive Defrost Cycle
Mode. High limit = 30 minutes; Low limit = 0 minutes; Default = 30
minutes.