Orion System System Manager TS II In-House - Manual (Page 53)

SMTS II Technical Guide
VCM, VCM-X & VCB-X Controllers
53
VCB-X Controllers
VCB-X Temperature Setpoints
Heating 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 Heating
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 Heating Maximum Fan VFD Signal Setpoint
as the Space Temperature falls towards this setpoint. High limit = 150ºF
/ 65.55ºC; Low limit = -10ºF / -23.3ºC. Default = 70ºF / 21ºC.
Supply Setpoint Reset Loop Rate
If you selected Space, Outdoor Air Temperature, Return Air Temperature,
or Fan VFD Signal as the SAT Reset Source, enter a value in seconds
between 1-255. This value determines how fast the Supply Air Tempera-
ture Setpoint is adjusted as the Reset Source changes. High limit = 255
seconds; Low limit = 1 second; Default = 30 seconds.
Heating Staging Window
When the VCB-X Controller is in Heating Mode, if the Supply Air
Temperature rises above the Active Supply Air Heating Setpoint plus the
Heating Staging Off Deadband value, a Heating stage will be deactivated
after its Minimum Run Time. High limit = 30ºF / 16.66ºC (no offset);
Low limit = 1ºF / 0.55ºC; Default = 5ºF / 2.80ºC.
Heating Outdoor Air Lockout
The VCB-X controller will Lockout Mechanical Heating when the
Outdoor Air Temperature is above this Setpoint. High limit = 150ºF /
65.55ºC; Low limit = 35ºF / 1.66ºC; Default = 90ºF / 32.2ºC.
Heating Minimum Fan VFD Signal
If this unit is confi gured for Single Zone VAV operation, and you have
a modulating heat source that will allow VAV heating, then the Heating
Minimum Fan VFD Signal will be the fan speed at which the VFD will
start operating at when heating is initiated. It can then modulate up to the
Heat Mode Maximum Fan VFD Signal as the Space Temperature falls
within the range created by the Hi Space Setpoint and the Low Space
Setpoint. If this is a CAV unit or a Single Zone VAV unit that will have
CAV Heating, these setpoints should both be set at the same value which
represents the constant speed you want the fan to operate at during the
Heating Mode. On a unit controlling to a Duct Static Pressure Setpoint,
if the Supply Fan VFD Signal falls below this setpoint in the Heating
Mode, Heating will be disabled. Minimum Signal High limit = 100%;
Minimum Signal Low limit = 30%; Default = 50%.
Heating High Cutoff Temperature
The VCB-X controller will temporarily disable Heating if while in Heat-
ing Mode, the Supply Air Temperature rises above this Heating High
Temperature Cutoff Setpoint. See the VCB-X Controller Field Technical
Guide for detailed information on the Low and High Supply Air Tem-
perature Cutoff sequence of operation. High limit = 250ºF / 121.11ºC;
Low limit = 0ºF / -17.77ºC; Default = 150ºF / 65.50ºC.
Mod Heating Proportional Window
The Modulating Heating Window is the control range of the Modulating
Signal above and below the Active Supply Air Temperature Setpoint. The
larger the Modulating Heating 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.
Mod Heating Unoccupied Position
This screen can be used to ensure that a Modulating Hot Water Valve
will open to a certain position when the fan is not operating in order to
prevent freezing. For other forms of Modulating Heat, this would nor-
mally be set to 0%. High limit = 100%; Low limit = 0%; Default = 0%.
Heat Pump Outdoor Air Lockout
If the Outdoor Air Temperature is below this value, the Heat Pump
Compressor heat will be disabled. High limit = 100ºF / 37.77ºC; Low
limit = -30ºF / -34.44ºC; Default = 35ºF / 1.6ºC.
Warmup Mode Supply Air Setpoint
Heating will be controlled to this Supply Air Setpoint during Morning
Warm-Up. High limit = 240ºF / 115.55ºC; Low limit = 40ºF / 4.5ºC;
Default = 100ºF / 37.77ºC.
Cooldown Mode Supply Air Setpoint
Cooling will be controlled to this Supply Air Setpoint during Cool-
Down. High limit = 80ºF / 26.6ºC; Low limit = 30ºF / -1.11ºC; Default
= 55ºF / 12.8ºC.
Setpoints for Unit 0001
Heating Staging Window
Heating High Cutoff Temperature
Mod Heating Proportional Window
5
150
10
°F
Heating Outdoor Air Lockout
Heating Minimum Fan VFD Signal
90
60
°F
°F
°F
°F
Temperatures Page 8 of 9
Figure 101: VCB-X Temperature Screen 8
Setpoints for Unit 0001
Mod Heating Unoccupied Position 0 °F
Heat Pump Outdoor Air Lockout 35 °F
Temperatures
Page 9 of 9
Warmup Mode Supply Air Setpoint 100 °F
Cooldown Mode Supply Air Setpoint 55
°F
Figure 102: VCB-X Temperature Screen 9