Orion System System Manager TS II In-House - Manual (Page 36)

VCM & VCM-X Controllers
SMTS II Technical Guide 36
VCM & VCM-X Static
Carbon Dioxide Setpoint
When the CO
2
level rises above the CO
2
Protection Limit Max Level, the
Economizer’s Minimum Position will begin to reset open proportionally
between the CO
2
Protection Limit Max Level Setpoint and the Reset Range
Setpoint. The Reset Range value is added to the Max Level value. High
limit = 3000 PPM; Low limit = 0 PPM; Default = 900 PPM.
Carbon Dioxide Reset Range
During the IAQ mode, this is the maximum amount above the CO
2
limit
that will cause the Economizer to reset to its maximum position. If the
CO
2
levels are equal to or above the Max Level plus the Reset Range,
the Economizer will be opened to its Maximum Economizer Position
if high CO
2
levels occur. High limit = 1500 PPM; Low limit = 0 PPM;
Default = 100 PPM.
Outdoor Airfl ow Intake Area
For the controller to properly calculate the Outside Air CFM, you need
to enter the inside area (sq. ft.) of the Outdoor Air Duct/Damper. When
measuring the Outdoor Air Damper area, be sure to measure the inside
dimensions of the damper. The more accurate the measurements, the more
accurate the CFM reading will be. This value needs to be accurate to 2
decimal places. High limit = 200 sq. ft.; Low limit = 0 sq. ft.; Default
= 0 sq. ft.
Exhaust Airfl ow Duct Area
For the controller to properly calculate the Exhaust Air CFM, you need
to enter the area in square feet of the Exhaust Air Duct/Damper. When
measuring the Exhaust Air Damper area, be sure to measure the inside
dimensions of the damper. The more accurate the measurements, the more
accurate the CFM reading will be. This value needs to be accurate to 2
decimal places. High limit = 200 sq. ft.; Low limit = 0 sq. ft.; Default
= 0 sq. ft.
Supply Air Duct Area
For the controller to properly calculate the Supply Air CFM, you need
to enter the area in square feet of the Supply Air Duct/Damper. When
measuring the Supply Duct Damper area, be sure to measure the inside
dimensions of the damper. The more accurate the measurements, the more
accurate the CFM reading will be. This value needs to be accurate to 2
decimal places. High limit = 200 sq. ft.; Low limit = 0 sq. ft.; Default
= 0 sq. ft.
Minimum Outdoor Air CFM
If controlling the Outdoor Air Damper to a CFM Setpoint, this screen
allows you to enter the design minimum required Outdoor Airfl ow for
the air handler. High limit = 200 K CFM; Low limit = 0.10 K CFM;
Default = 0.10 K CFM.
Maximum Outdoor Air CFM
If controlling the Outdoor Air Damper to a CFM Setpoint, this screen
allows you to enter the design maximum required Outdoor Airfl ow for
the air handler. This is only used during CO
2
override conditions. High
limit = 200 K CFM; Low limit = 0.10 K CFM; Default = 0.10 K CFM.
OA CFM Proportional Window
If the CFM reading is this far from setpoint, the controller will make
5% signal adjustments to try to get to setpoint. High limit = 1000 CFM;
Low limit = 10 CFM; Default = 10 CFM.
Max OA Damper Tempering Limit
The Maximum OA Damper Tempering Limit Setpoint allows you to
set the Maximum Damper position the Economizer can open to while
the heat is running during the Tempering Mode in this sequence (to
prevent potential wasting of energy). Enter the maximum position the
Economizer can open in the Supply Air Tempering Mode. High Limit
= 60%; Low limit = 0%; Default = 50%.
Mod Cooling Window
The Modulating Cooling Window is the control range of the Modulat-
ing Signal above and below the Active Supply Air Setpoint. The larger
the Modulating Cooling Window, the smaller the signal adjustment
per Time Period will be for each ºF the supply air 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; Low limit = 1ºF; Default = 10ºF.
Mod Heating Window
The Modulating Heating Window is the control range of the Modulat-
ing Signal above and below the Active Supply Air Setpoint. The larger
the Modulating Heating Window, the smaller the signal adjustment per
Time Period will be for each ºF the supply air 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; Low limit = 1ºF; Default = 10 ºF.
Heating Minimum VFD
If the Supply Fan VFD signal falls below this setpoint, Heating will be
disabled. The Main Fan VFD signal must be at or above this percentage
before any heat is allowed to activate. High limit = 100%; Low limit
= 0%; Default = 30%.
Setpoints for Unit 0102
Outdoor Airflow Intake Area 0.80 Sq Ft
Exhaust Airflow Duct Area
Supply Air Duct Area
0.00
0.00
Static & Air Setpoints
Sq Ft
Sq Ft
Minimum Outdoor Airflow 10 K CFM
Maximum Outdoor Airflow 10 K CFM
Page 3 of 4
Figure 58: VCM-X Static & Air Setpoints Screen 3
Setpoints for Unit 0102
OA CFM Proportional Window 10 CFM
Static & Air Setpoints Page 4 of 4
Max OA Damper Tempering Limit 0 %
Mod Cooling Window 10 °F
Mod Heating Window 10 °F
Heating Minimum VFD 30 %
Figure 59: VCM-X Static & Air Setpoints Screen 4