Honeywell CVL4022ASVAV1 Engineering Manual Download Page 5

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31-00083—02

Control Provided

The CVL Controllers are primarily intended for pressure

independent, single duct VAV box control. Pressure

independent control specifies that the individual zone terminal

unit has a means for maintaining a consistent volume of air

into the zone regardless of the input static pressure. The

controller modulates the air flow into the zone to satisfy the

Zone Temperature Setpoint. Minimum Air Flows are

maintained except during emergency strategy periods or

during building Unoccupied periods if using physical position

stops, a MIN/MAX air flow is always maintained (see Table 3).

Pressure dependent control specifies that the damper position

is controlled by space temperature only and not by a

measurement of air flow volume. The amount of air delivered

to the zone at any given damper position is dependent on the

static pressure in the supply air duct (physical position stops,

range stop pins, are used to keep the damper at a fixed

position). Additional outputs are available for control of heating

systems such as reheat coils for Heat mode or Morning warm-

up mode operation. The heating equipment can be staged-

resistive heating, staged 2-position (solenoid) valve, or

modulated steam or hot water valve.

Table 3. Modes of Operation For CVL Controller

Mode

Description

Events Causing a Controller to Switch to This Mode

Effective Occupancy

OCCUPIED

Controller is in Occupied mode

Any of the following: Local schedule state, Network input

(nviTodEvent) containing time- of-day schedule, flag from either an

Occupancy Sensor Digital Input, or from the Network input

(nviManOcc) for manual override to OCCUPIED mode.

STANDBY

Controller is in Standby mode.

Local schedule, Network input (nviTodEvent) containing time-of-day

schedule flag from the network must be OCCUPIED and the

Occupancy Sensor Digital Input must be UNOCCUPIED.

UNOCCUPIED

Controller is in Unoccupied mode.

Local schedule, Network input (nviTodEvent) containing time-of-day

schedule flag from either an Occupancy Sensor Digital Input, or

from the Network input (nviManOcc) has a value of UNOCCUPIED.

Override Modes

OCCUPIED

Controller is in Occupied mode.

Network input (nviTodEvent) containing time-of-day schedule flag

from the Network input (nviManOcc) for manual override to

OCCUPIED mode.

UNOCCUPIED

Controller is in Unoccupied mode.

Network input (nviTodEvent) containing time-of-day schedule flag

from the network input (nviManOcc) has a value of UNOCCUPIED.

BYPASS

User-initiated Bypass of the

Unoccupied mode

Digital input (wall module override push button) has been pressed

or override initiated from Zio and the Bypass duration timer has not

yet expired, or the network input nviBypass received.

NOT ASSIGNED

No Bypass action.

No Override input received.

Operational Modes

START-UP AND

WAIT (followed by)

Configurable flow Diversity on

power-up provides a staggered start

sequence to evenly apply the load to

the supply fan and electrical system.

These modes occur on controller power-up, and after downloading

to the controller from the tool or going to auto mode to manual

mode. Temperature and flow control loops are disabled.

COOLING

The VAV Controller is controlling the

Cooling mode.

Network input nviApplicMode containing AHU operational mode

information from other LONWORKS Bus controllers that have the

value of COOL/AUTO.

HEATING

The VAV Controller is controlling the

Heating mode.

Network input nviApplicMode containing AHU operational mode

information from other LONWORKS Bus controllers that have the

value of HEAT/AUTO. Unit switches to Heat mode when warm air is

supplied to the terminal unit.

REHEAT

The VAV Controller is controlling the

Reheating mode.

Network input nviApplicMode has the value of AUTO, so that when

cool air is supplied to the box and the space temperature is below

the Heating Setpoint, causes the control algorithm to energize the

Reheat coil(s).

MORNING

WARMUP

The main AHU is supplying warm air

and the box damper is set at

(WarmupDmprPos)

Network input nviApplicMode containing AHU operational mode

information from LONWORKS Bus controllers that have the value

of MORINING WARM-UP.

NIGHT PURGE

The main AHU is supplying fresh

(100 percent outdoor) air, and box

damper is set at (PurgeDmprPos)

Network input (nviApplicMode) containing AHU operational mode

information from LONWORKS Bus controllers that have the value

of NIGHT PURGE.

Summary of Contents for CVL4022ASVAV1

Page 1: ...31 00083 02 Environmental Combustion and Control Stryker Lon VAV System Engineering Guide September 2015 ...

Page 2: ...w measurement for pressure independent applications The CVL controller controls the space temperature in a given zone by modulating a damper and or regulating a reheat coil in a Variable Air Volume Box that delivers air to one space The controller is capable of stand alone operation however optimum functional benefits are achieved when the network communication capabilities are used The Zio TR71 T...

Page 3: ...application for the CVL4022AS VAV1 controller Table 2 shows the capabilities of the CVL controllers Fig 1 Typical CVL4022NS VAV1 box control application Fig 2 Typical CVL4022AS VAV1 box control application DP PICKUP M1 M2 WINDOW CONTACT ECHELON BUS OCCUPANCY CONTACT DISCHARGE AIR TERMINAL HEAT AIR TERMINAL UNIT PRIMARY AIR M1 DAMPER ACTUATOR M2 VALVE ACTUATOR TEMPERATURE SENSOR WITH REMOTE SETPOIN...

Page 4: ...ning Warm up with configurable Warm up operat ing modes Local modulating output Temperature setpoint shift Network override of Local time schedule Reheat and peripheral heating valves Airflow control Occupancy mode Effective space temperature setpoint Local inputs Network sharing of Occupancy Sensor Space temperature CO2 Sensor Humidity Sensor Wall Module Outdoor air temperature Outdoor air humidi...

Page 5: ... UNOCCUPIED Override Modes OCCUPIED Controller is in Occupied mode Network input nviTodEvent containing time of day schedule flag from the Network input nviManOcc for manual override to OCCUPIED mode UNOCCUPIED Controller is in Unoccupied mode Network input nviTodEvent containing time of day schedule flag from the network input nviManOcc has a value of UNOCCUPIED BYPASS User initiated Bypass of th...

Page 6: ... Controller is in freeze protection mode Heating setpoint is reset to freeze protection setpoint Window is open EMERGENCY PRESSURIZE move the damper to the emergency pressurize position Fan disabled Emergency network command received nviEmergCmd 1 EMERGENCY DEPRESSURIZE move the damper to the emergency depressurize position Fan disabled Emergency network command received nviEmergCmd 2 PURGE move t...

Page 7: ...uration for automatic day light savings time adjustment to occur at 2 00 a m local time on configured start and stop dates Power Failure Backup 24 hours at 32 to 100 F 0 to 38 C 22 hours at 100 to 122 F 38 to 50 C Accuracy 1 minute per month at 77 F 25 C Inputs and Outputs CVL4022AS VAV1 has four universal input UI circuits two analog outputs AO and two digital Triac outputs DO Two Digital Outputs...

Page 8: ...Condition OFF not applicable No power to processor LED damaged low voltage to board or controller damaged ON ON steady not blinking Processor and or controller is not operating Very slow blink continuous 1 second ON 1 second OFF Controller is operating normally Slow blink continuous 0 5 second ON 0 5 second OFF Controller alarm is active controller in process of download or controller lost its con...

Page 9: ...rs can attack the metal parts of the controller or in areas where escaping gas or other explosive vapors are present see Fig 6 Fig 7 on page 11 for mounting dimensions Mount Actuator onto Damper Shaft CVL4022AS VAV1 only The CVL4022AS VAV1 controller includes the direct coupled actuator with Declutch mechanism which is shipped hard wired to the controller The actuator mounts directly onto the VAV ...

Page 10: ...1 If the damper rotates clockwise CW to open and the angle of the damper open to closed is 90 degrees a Manually open the damper fully rotate clockwise b Using the Declutch button rotate the universal shaft adapter fully clockwise c Mount the actuator to the VAV damper box and shaft d Tighten the two bolts on the centering clamp 8 mm wrench 70 8 88 5 lb in 8 10 Nm torque When the actuator closes t...

Page 11: ...g The controller enclosure is constructed of a plastic base plate and a plastic factory snap on cover NOTE The controller is designed so that the cover does not need to be removed from the base plate for either mounting or wiring The controller mounts using four screws inserted through the corners of the base plate Fasten securely with four No 6 or No 8 machine or sheet metal screws The controller...

Page 12: ... must comply with applicable electrical codes and ordinances or as specified on installation wiring diagrams Controller wiring is terminated to the screw terminal blocks located on the top and the bottom of the device WARNING Electrical Shock Hazard Can cause severe injury death or property damage Disconnect power supply before beginning wiring or making wiring connections to prevent electrical sh...

Page 13: ...the system Select input and output devices compatible with the controller and the application Consider the operating range wiring requirements and the environment conditions when selecting input output devices When selecting actuators for modulating applications consider using floating control In direct digital control applications floating actuators will generally provide control action equal to ...

Page 14: ...single transformer can power more than one controller Line Loss Controllers must receive a minimum supply voltage of 20 Vac If long power or output wire runs are required a voltage drop due to Ohms Law I x R line loss must be considered This line loss can result in a significant increase in total power required and thereby affect transformer sizing The following example is an I x R line loss calcu...

Page 15: ...nsidered reliable Compliance with the NEMA standard is voluntary Fig 12 NEMA Class 2 transformer voltage output limits The Honeywell transformers listed in Table 9 meet the NEMA standard DC20 1986 Table 9 Honeywell transformers that meet NEMA stan dard DC20 1986 NOTE The AT88A and AT92A transformers do not meet the voluntary NEMA standard DC20 1986 Wiring All wiring must comply with applicable ele...

Page 16: ...g details for two or more controllers per transformer CONNECT POWER TO TERMINALS 1 AND 2 EARTH GROUND TERMINAL 3 TRANSFORMER OUTPUT DEVICE POWER M33634 COM 24 VAC ΔP 1 1 1 1 1 1 1 2 2 2 2 2 3 4 5 6 7 8 9 0 1 2 3 4 UI 4 COM UI 3 UI 2 COM UI 1 AO 2 COM AO 1 COM DO 2 DO 1 1 1 1 2 3 4 5 6 7 8 9 0 1 2 COM DO 4 COM DO 3 NET 2 NE1 2 S BUS 2 S BUS 1 20VDC EGND 24VAC COM 24VAC ΔP 1 1 1 1 1 1 1 2 2 2 2 2 3 ...

Page 17: ...ing lighting dimmer switches Keep at least 3 in 76 mm of separation between noisy lines and the LONWORKS Bus cable The theoretical limit for each LONWORKS Bus segment is 60 controllers Up to 120 controllers can be configured when a repeater is used and the bus must be either singly or doubly terminated Actual installations may have a lower limit depending on the devices connected The singly termin...

Page 18: ...igital output as follows False 0 produces 0 Vdc 0 mA True 100 produces the maximum 11 Vdc 22 mA The wiring connection terminals described in Table 10 are shown in Fig 19 and Fig 20 on page 20 and 20 Table 10 Description of wiring terminal connections 1 2 13 STRIP 1 2 IN 13 MM FROM WIRES TO BE ATTACHED AT ONE TERMINAL 1 2 TWIST WIRES TOGETHER WITH PLIERS A MINIMUM OF THREE TURNS 3 CUT TWISTED END O...

Page 19: ...object to press the NEURON Service Pin Use a plastic rod or wood device such as a pencil with the lead broken off to press the pin Using a metal object can damage the circuitry of the controller LONWORKS BUS CONVENIENCE JACK The LONWORKS Bus connection is provided by plugging the Serial LONTALK Adapter SLTA connector into the LONWORKS Bus Jack see Fig 18 Fig 18 Controller terminal connections NEUR...

Page 20: ...OR EARTH GROUND WIRE M33822 LON NETWORK 24 VAC 24 VAC COM ML6161 DAMPER ACTUATOR CW COM CCW AIR FLOW PICKUP ΔP 1 1 1 1 1 1 1 2 2 2 2 2 3 4 5 6 7 8 9 0 1 2 3 4 UI 4 COM UI 3 UI 2 COM UI 1 AO 2 COM AO 1 COM DO 2 DO 1 1 1 1 2 3 4 5 6 7 8 9 0 1 2 COM DO 4 COM DO 3 NET 2 NE1 2 S BUS 2 S BUS 1 20VDC EGND 24VAC COM 24VAC 1 11 10 9 8 7 6 5 4 3 2 12 GND SENSOR LON LON SETPT LED OVERRIDE SERIES OR PARALLEL ...

Page 21: ...AWG 1 O MM2 FOR EARTH GROUND WIRE M33826 LON NETWORK 24 VAC 24 VAC COM AIR FLOW PICKUP ΔP 1 1 1 1 1 1 1 2 2 2 2 2 3 4 5 6 7 8 9 0 1 2 3 4 UI 4 COM UI 3 UI 2 COM UI 1 AO 2 COM AO 1 COM DO 2 DO 1 1 1 1 2 3 4 5 6 7 8 9 0 1 2 COM DO 4 COM DO 3 NET 2 NE1 2 S BUS 2 S BUS 1 20VDC EGND 24VAC COM 24VAC 1 11 10 9 8 7 6 5 4 3 2 12 GND SENSOR LON LON SETPT LED OVERRIDE SERIES OR PARALLEL FAN CONTACTOR REHEAT ...

Page 22: ...rams should indicate the locations for placement of the 209541B termination module s See Fig 16 on page 17 and refer to the LONWORKS Bus Wiring Guidelines form 74 2865 Correct placement of the termination module s is required for proper LONWORKS Bus communications Step 2 Startup Refer to Fig 21 and the following text for startup information Fig 21 LED service pin and network connection locations B...

Page 23: ...pins 1 4 in 6 35 mm b For long terminal blocks 6 or more terminals insert screwdriver blade on one side of the terminal block and gently rotate the blade 1 4 turn Then move to the other side of the terminal block and do the same Repeat until the terminal block is evenly raised 1 4 in 6 35 mm from its alignment pins 2 Once the terminal block is raised 1 4 in 6 35 mm from its alignment pins grasp th...

Page 24: ...dow Open Digital Input directly wired to the controller Configurable as normally open closed Monitor switch Option 1 Network input 2 Local Monitor switch general purpose Digital Input directly wired to the controller Configurable as normally open closed Occupancy Sensor Option 1 Network input 2 Local Occupancy sensor Digital Input directly wired to the controller Configurable as normally open clos...

Page 25: ...tThenPeriph Proportional Pressure Type Pressure Independent or Pressure_Dependent Reheat Type Float_Reheat_Periph or PWM_Reheat_Periph Proportional Reheat Flow Enable Periph Min Pos 0 or greater Fig 26 VAV box modes for Reheat Type Reheat Then Peripheral Heating Proportional Float_Reheat_Periph PWM_Reheat_Periph Reheat Type FloatHotDuctPrDep Proportional Reheat Flow Disable Periph Min Pos 0 or gre...

Page 26: ...low falls below a minimum air flow setpoint to maintain a minimum air flow to the space Parallel Flow NOTE The location of the heating coils can be in the discharge as shown in Fig 30 or as part of the plenum air return either before or after the fan Fig 30 Parallel VAV Box Fan See Fig 31 and Fig 32 to see the Heat Cool Modes for Parallel Temperature Flow VAV box fans 100 PERCENT OPEN REHEAT FLOW ...

Page 27: ... of number 3 to the nviFlowtTrack of number 4 Flow Tracking Application Notes 1 Flow tracking is intended for noncritical slow respond ing commercial building zone pressurization control sequences This means that average pressurization can be maintained if disturbances are slow acting but fast disturbances may result in temporary short term imbal ances Do not apply the VAV Flow Tracking option in ...

Page 28: ...or Sen Input sensor value SP Setpoint TR Throttling Range Ti Integral Time Td Derivative Time O If V x 100 M 0 Then 0 60 70 80 1 1 1 1 1 1 1 2 2 2 2 2 3 4 5 6 7 8 9 0 1 2 3 4 UI 4 COM UI 3 UI 2 COM UI 1 AO 2 COM AO 1 COM DO 2 DO 1 1 1 1 2 3 4 5 6 7 8 9 0 1 2 COM DO 4 COM DO 3 NET 2 NE1 2 S BUS 2 S BUS 1 20VDC EGND 24VAC COM 24VAC T7770 COLD DUCT SUPPLY AIR FLOW SENSOR DISCHARGE AIR nvoFLOW TRACK S...

Page 29: ...point of the sensed medium input sensor divided by the throttling range in the units of the input sensor The setpoint is the value of the input sensor that satisfies the control loop When the input sensor value is at the setpoint there is no proportional error and the output is 0 percent The throttling range is the amount of change in the sensed medium that is required to drive the output from 0 t...

Page 30: ...n for the control loop Stability of the PI control loop is a balance of the throttling range and the integral time If a PI control loop is unstable increase the throttling range and or increase the integral time Generally the throttling range required for PI control is greater than what is used for proportional control only PI control should only be used in closed loop applications Without feedbac...

Page 31: ...t by the derivative time in seconds The derivative error is summed with the proportional and integral errors to determine the loop output value In selecting the derivative time setting the smaller the time setting the smaller the derivative effect and the greater the time setting the greater the derivative effect A derivative time of 0 default eliminates the derivative error If using the derivativ...

Page 32: ...occupied setpoint as the reset input value varies from the Minimum Reset Sensor Value to the Max reset sensor value The accessory loop determines the occupancy state based on the configured occupancy input Occupancy input can be configured as a local digital input or can also be configured to use the effective occupancy status of the main VAV application Alternately the scheduled occupancy state c...

Page 33: ...he setpoint used will always follow the effective setpoint from the main application of the controller 4 From Control Params tab a Choose the desired PID loop settings 5 Assign the desired terminals from the Custom Wiring tab Heating loop with a modulating valve using the Loop Occupied Unoccupied and Standby setpoints and occupancy from the internal application 1 From Outputs tab a Select Analog C...

Page 34: ... Auxiliary Pulse Off in the VAV Outputs tab and the assigned DO s will follow the effective occupancy of the controller On the Schedule configuration screen you may choose whether the Standby period is treated as occupied or unoccupied Fan control An accessory loop is not necessary for simple exhaust fan control Select Digital Control for the Auxiliary Digital Output in the VAV Outputs tab and the...

Page 35: ...ibration 1 Change the Wall Module to the contractor view 2 Navigate to Parameters OVERRIDE FLO_OVRD 3 Close the Primary Air damper FLO_OVRD CLOS 4 Navigate to Parameters STATUS DAMPER 5 Wait for the damper to close DAMPER 0 6 Navigate to Parameters SENSORS PRS_UCAL 7 Monitor the flow pressure signal for stability PRS_U CAL 8 Navigate to Parameters SNSR_CAL PRESS_OF 9 Set the new zero offset PRESS_...

Page 36: ...r active alarm nvoAlarmH If an alarm condition is detected the corresponding alarm is reported to a supervisory node via nvoAlarmH nvoAlarmH reports only one alarm or return to normal at a time Each alarm condition is issued only once nvoAlarmH is sent over the LonWorks network using acknowledged service to assure that a supervisory node will receive the alarm This NV is intended to be bound to a ...

Page 37: ...iFlowTrack 57 Failed to receive nviOccCmd 58 Failed to receive nviOdTemp 59 Failed to receive nviSetPoint 60 Failed to receive nviFree1Mod 61 Failed to receive nviShare 62 Failed to receive nviWindow 63 Failed to receive nviDlcShed 64 Failed to receive nviFlowOffset 65 Failed to receive nviFree1Dig 66 Sylk bus error A sylk device is not responding or there is an unexpected Sylk device on the netwo...

Page 38: ... space temperature sensor SetPt Error SensorFailed Uses default occupied Set Points Dischg Temp Error SensorFailed None Supply Temp Error SensorFailed Supply temperature is taken out of the Mode arbitration logic airflow Error SensorFailed When the mode is Cool the damper is modulated between 15 and 60 When the mode is ReHeat the damper is set to a calculated value nvoFlowTrack 0 nviFlowTrack nviS...

Page 39: ...sal input type 0 20 Kntc UI_20Kntc 1 TR2x 20Kntc UI_TR2xSensor 2 TR2x SetPt Absolute UI_TR2xSetPtAbs 3 TR2x SetPt Relative UI_TR2xSetPtRel 4 RH 0 to 10 vdc UI_RH_0_10vdc 5 RH 2 to 10 vdc UI_RH_2_10vdc 6 CO2 0 to 2000 ppm UI_CO2 7 Press 0 to 5 inWc UI_Press5inWc 8 Press 0 to 2 5 inWc UI_Press2_5inWc 9 Press 0 to 0 25 inWc UI_PressQtrInWc 10 Voltage Sensor 0 to 10 vdc UI_Volt 11 Custom Sensor 1 UI_C...

Page 40: ...Sensor reference high limit value in output counts If the output count falls above this value the controller will report an INVALID value for the sensor toolUnits ubyte 0 Tool unit identifier This is an enumeration identifying the units associated with the custom sensor analog input For external tool use only It is of no interest to the controller userUnitLow float 0 Sensor reference low value in ...

Page 41: ...with the custom sensor analog input For external tool use only It is of no interest to the controller userUnitLow float 0 Sensor reference low value in user selected engineering units that corresponds to an output count of 10 userUnitHigh float 0 Sensor reference high value in user selected engineering units that corresponds to an output count of 65510 nciCstmSnsr2I Custom Sensor 2 Configuration I...

Page 42: ...ble 15 Local Input Configuration Continued NCI Field Net Data Type Default Val AP Internal Units Description Sbus Adrss C7400S1000 DIP Switch 1 2 3 8 OFF OFF OFF Table 16 Logical Inputs Enumeration Table Ordinal Nickname 0 UI_1 1 UI_2 2 UI_3 3 UI_4 4 DI_1 5 nviDlcShed 6 HtgStg1 7 HtgStg2 8 HtgStg3 9 PerphHtgStg1 10 DisableClg 11 DisableHtg 12 FanOn 13 FrzProtection 14 nviMonDig 15 nviFree1Dig 16 V...

Page 43: ... 42 DmprPos 43 ReheatMod 44 PeriphHtgMod 45 FanMod 46 TeminalLoad 47 AcLp1PID 48 AcLp2PID 49 AcLp1Reset 50 AcLp2Reset 255 Undefined Table 16 Logical Inputs Enumeration Table Continued Ordinal Nickname Table 17 Logical Input Configuration NCI Field Net Data Type Default Val Description nciLogicalInAcc Accessory loop logical input configuration ...

Page 44: ...escription 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 19 C7400sTempYSnapshot 22 C7400sRHYSnapshot 30 SpcTempLogicalEFF_OUTPUTSnapshot 31 SpcRHLogicalEFF_OUTPUTSnapshot 32 SpcCO2LogicalEFF_OUTPUTSnapshot 33 SplyTempLogicalEFF_OUTUTSnapshot 34 DatLogicalEFF_OUTPUTSnapshot 35 FlowPressCalOUTPUTSnapshot 36 nviFree1Mod_levPercentoutSnapshot 37 OdTempLogicalEFF_OUTPUTSnapshot 255 Undefined ...

Page 45: ...400sRHYSnapshot 30 SpcTempLogicalEFF_OUTPUTSnapshot 31 SpcRHLogicalEFF_OUTPUTSnapshot 32 SpcCO2LogicalEFF_OUTPUTSnapshot 33 SplyTempLogicalEFF_OUTUTSnapshot 34 DatLogicalEFF_OUTPUTSnapshot 35 FlowPressCalOUTPUTSnapshot 36 nviFree1Mod_levPercentoutSnapshot 37 OdTempLogicalEFF_OUTPUTSnapshot 40 WallModCntrSPYSnapshot 41 AirFlowOUTPUTSnapshot 42 DmprPosApproxOUTPUTSnapshot 43 ReheatModOUTPUTSnapshot ...

Page 46: ...Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 5 nviDlcShed_stateoutSnapshot 6 HtgStg1OUTPUTSnapshot 7 RHStageDriverSTAGE2Snapshot 8 RHStageDriverTAGE3Snapshot 9 PerphHtgSTAGE1Snapshot 10 Disable_Clg_TChgOUTPUTSnapshot 11 Disable_Htg_TChgOUTPUTSnapshot 12 FanOnEFF_OUTPUTSnapshot 13 FrzPrtctOUTPUTSnapshot 14 nviMonDigOUTPUTSnapshot 15 Free1DigOUTPUTSnapshot 255 Undefined 0 ...

Page 47: ...escription 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 19 C7400sTempYSnapshot 22 C7400sRHYSnapshot 30 SpcTempLogicalEFF_OUTPUTSnapshot 31 SpcRHLogicalEFF_OUTPUTSnapshot 32 SpcCO2LogicalEFF_OUTPUTSnapshot 33 SplyTempLogicalEFF_OUTUTSnapshot 34 DatLogicalEFF_OUTPUTSnapshot 35 FlowPressCalOUTPUTSnapshot 36 nviFree1Mod_levPercentoutSnapshot 37 OdTempLogicalEFF_OUTPUTSnapshot 255 Undefined ...

Page 48: ...400sRHYSnapshot 30 SpcTempLogicalEFF_OUTPUTSnapshot 31 SpcRHLogicalEFF_OUTPUTSnapshot 32 SpcCO2LogicalEFF_OUTPUTSnapshot 33 SplyTempLogicalEFF_OUTUTSnapshot 34 DatLogicalEFF_OUTPUTSnapshot 35 FlowPressCalOUTPUTSnapshot 36 nviFree1Mod_levPercentoutSnapshot 37 OdTempLogicalEFF_OUTPUTSnapshot 40 WallModCntrSPYSnapshot 41 AirFlowOUTPUTSnapshot 42 DmprPosApproxOUTPUTSnapshot 43 ReheatModOUTPUTSnapshot ...

Page 49: ...Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 5 nviDlcShed_stateoutSnapshot 6 HtgStg1OUTPUTSnapshot 7 RHStageDriverSTAGE2Snapshot 8 RHStageDriverTAGE3Snapshot 9 PerphHtgSTAGE1Snapshot 10 Disable_Clg_TChgOUTPUTSnapshot 11 Disable_Htg_TChgOUTPUTSnapshot 12 FanOnEFF_OUTPUTSnapshot 13 FrzPrtctOUTPUTSnapshot 14 nviMonDigOUTPUTSnapshot 15 Free1DigOUTPUTSnapshot 255 Undefined 0 ...

Page 50: ...efined Table 17 Logical Input Configuration Continued NCI Field Net Data Type Default Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 21 nviSpaceRH_levPercentoutSnapshot 22 C7400sRHYSnapshot 23 ZioRHYSnapshot 255 Undefined 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 24 nviSpaceCO2_ppmoutSnapshot 255 Undefined 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLi...

Page 51: ...re inWc Default OnBrdPress Table 17 Logical Input Configuration Continued NCI Field Net Data Type Default Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 19 C7400sTempYSnapshot 26 nviSupplyTemp_tempPoutSnapshot 255 Undefined 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 19 C7400sTempYSnapshot 28 nviOdTemp_tempPoutSnapshot 255 Undefined 0 UI_1outLive 1 UI_2outLive ...

Page 52: ...its Binary Value 0 range 255 OccSensor ubyte 255 Occupancy sensor Application Units Binary Value or Occupancy Enumeration 0 255 0 range 255 Table 17 Logical Input Configuration Continued NCI Field Net Data Type Default Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 27 PressOnBrdoutLive 255 Undefined 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 19 C7400sTempYSnap...

Page 53: ...ir is supplied to the zone terminal 1 Heating warm air supplied to terminal 0 Cooling cold air supplied to terminal Application Units Binary Value 0 range 255 Table 17 Logical Input Configuration Continued NCI Field Net Data Type Default Val Description 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 255 Undefined 0 UI_1outLive 1 UI_2outLive 2 UI_3outLive 3 UI_4outLive 255 Undefined ...

Page 54: ...n LED WM Override Comment 0 2 to 1 1 second OFF OCCNUL No Override cancel 1 2 to 4 seconds ON BYPASS Timed Occupied Override Timer re loaded whenever the button is pressed for this duration WM Override is set to OCCNUL when timer expires 4 1 to 7 seconds 1 flash sec UNOCC Unoccupied Override Longer than 7 1 seconds OFF OCCNUL No Override cancel Override Button Held Down LED WM Override Comment 0 2...

Page 55: ...10 vdc AO_0_10vdcDir 1 10 to 0 vdc AO_0_10vdcRev 2 2 to 10 vdc AO_2_10vdcDir 3 10 to 2 vdc AO_2_10vdcRev 4 0 to 20 mA AO_0_20maDir 5 20 to 0 mA AO_0_20maRev 6 0 to 22 mA AO_0_22maDir 7 22 to 0 mA AO_0_22maRev 8 4 to 20 mA AO_4_20maDir 9 20 to 4 mA AO_4_20maRev 10 Binary output AO_Binary nciAO2 Configure local analog output analogRng ubyte 0 Analog range selection 0 0 to 10 vdc AO_0_10vdcDir 1 10 t...

Page 56: ... 5 PWM full time in seconds 1 range 3276 7 sec nciDO3 Configure local digital output type ubyte 0 Digital output type 0 Binary output 1 Pulse width modulating output pwmPer SNVT_ time_sec 25 6 PWM period in tenths of seconds 1 range 3276 7 sec pwmZero SNVT_ time_sec 0 1 PWM zero time in seconds 1 range 3276 7 sec pwmFull SNVT_ time_sec 25 5 PWM full time in seconds 1 range 3276 7 sec nciDO4 Config...

Page 57: ...Auto Sync Type 0 none 1 Sync closed 2 Sync open Refer to Appendix E Floating Actuator Auto Synch syncIntvl SNVT_ time_hour 24 Auto sync interval 0 range 254 hours Precision 1 pwrUpSync ubyte 0 Power up Sync Type 0 none 1 Sync closed 2 Sync open Refer to Appendix E Floating Actuator Auto Synch pwrUpDelay SNVT_ time_sec 0 Actuator Power up delay 0 range 3276 7 sec Precision 1 UnOccSync ubyte 0 Sync ...

Page 58: ... Auto Sync Type 0 none 1 Sync closed 2 Sync open Refer to Appendix E Floating Actuator Auto Synch syncIntvl SNVT_ time_hour 24 Auto sync interval 0 range 254 hours Precision 0 pwrUpSync ubyte 0 Power up Sync Type 0 none 1 Sync closed 2 Sync open Refer to Appendix E Floating Actuator Auto Synch pwrUpDelay SNVT_ time_sec 0 Actuator Power up delay 0 range 3276 7 sec Precision 1 UnOccSync ubyte 0 Sync...

Page 59: ...loat1 Float1in Floating modulating output 1 7 Float2 Float2in Floating modulating output 2 8 AO1Live AO1inLive Analog output 1 live data suitable for wall module LED 9 AO2Live AO2inLive Analog output 2 live data 255 Undefined Undefined Table 20 Logical Output Configuration NCI Field Net Data Type Default Val Description nciLogicalOutAcc Logical Accessory Loop Output Configuration Ac1Stg1 ubyte 255...

Page 60: ...odulating output value or staged output Output Type Binary Default Undefined 0 range 255 Ac1Mod ubyte 255 Accessory Loop 1 modulating output Output Type PWM Float Analog Current or Voltage Default Undefined 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in...

Page 61: ...ndefined 0 range 255 Ac2Stg3 ubyte 255 Accessory Loop 2 digital output Stage 3 Output Type Binary Default Undefined 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 ...

Page 62: ...or Voltage Default Undefined 0 range 255 nciLogicalOutVav Logical VAV Output Configuration HtgStg1 ubyte 255 Zone terminal Heating stage 1 Output Type Binary Default DO1 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 6 Float1in 7...

Page 63: ... Undefined 0 range 255 PeriphHtgStg ubyte 255 Peripheral heat stage output Output Type Binary 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined ...

Page 64: ...ulse ON output Typically connected to a lighting relay The output is pulsed when the effective occupancy changes to occupied Output Type Binary Default Undefined 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1i...

Page 65: ...e Binary Default Undefined 0 range 255 FreePlsOn ubyte 255 Free digital pulse ON output Typically connected to a lighting relay The output is controlled from the network command through nviFree1Dig Output Type Binary Default Undefined 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undef...

Page 66: ...log Current or Voltage Default AO1 0 range 255 ClgDmpr ubyte 6 Cooling damper modulating output Output Type PWM Float Analog Current or Voltage Default Float1 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 6 Float1in 7 Float2in 2...

Page 67: ...output Output Type PWM Float Analog current or voltage Default AO2 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 6 Float1in 7 Float2in 255 Undefined 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 6 Float1in 7 Float2in 255 Undefined ...

Page 68: ...cDir Retrofit Jobs Output SubType AO_0_10vdcDir AO_0_20maDir Default Undefined 0 range 255 Table 20 Logical Output Configuration Continued NCI Field Net Data Type Default Val Description 0 AO1in 1 AO2in 2 DO1in 3 DO2in 4 DO3in 5 DO4in 6 Float1in 7 Float2in 255 Undefined 8 AO1inLive 9 AO2inLive 255 Undefined Effective Override State LED OCCNUL Cancel Off Other values Off treat as OccNul BYPASS On U...

Page 69: ...OccCmd value Val ubyte state percent 0 none 1 Bypass nviDlcShed SNVT_ switch Network command for Demand Limit Control Notes When DLC is active the control loop setpoint is shifted ncidlcShiftSpt in the energy savings direction When DLC is inactive the control loop normal setpoint is restored using a 30 minute ramp value ignored state VAL ubyte 0 no DLC 1 DLC active shift room setpoint ncidlcShiftS...

Page 70: ...n override fan modulating output Else ignore override value state 0 fan off 1 fan on NUL no override Note The state value must be set to NULL to disable the override signal nviFlowOffset lev_percent Airflow offset to the occupied minimum airflow setpoint Typically used to improve indoor air quality 100 range 100 Pressure dependent Occupied Valid Value EffMinFlowSP MinFlowSP nviFlowOffset Pressure ...

Page 71: ...c_overid Heating override Applies to peripheral heat reheat Notes This override duplicates the functionality of nviValveOvrd Use nviHtgOvr to command peripheral and reheat valves simultaneously state ubyte 0 no override normal operation 1 manual reheat peripheral flow position 4 open reheat peripheral valve 5 close reheat peripheral valve all others no override percent SNVT_ lev_percent Manual per...

Page 72: ...al nviMonSensor count_inc_f unit less Monitor sensor Typically used to override the local monitor analog sensor 3 399999952144364E38 range 3 399999952144364E38 nviOccCmd occupancy occupancy Allows an occupancy sensor at another node to be used as the occupancy sensor for this node and is typically bound to the occupancy sensor output from another node The nviOccCmd must show UnOcc for the 300 seco...

Page 73: ...r network connected tool and should not be bound to a network wall module nviSetPtOffset temp_diff_p Delta F This network input is used to temporarily shift the effective heating and cooling setpoint The value is added to the effective setpoint The shift is effective setpoint for Occupied Bypass and Standby modes 10 range 10 F Setpoint Override Priority Table 21 Network Variable Inputs Continued N...

Page 74: ...a valid numerical value before any Wall Module sharing functions are enabled Mode count_inc Master Node Status 0 Startup wait 1 Heat 2 Cool 3 Reheat 4 Morn_Warm 5 Night Purge 6 Pressurize 7 Depressurize 8 Trackflow Ignored by satellite node 9 Manual Damper Position Ignored by satellite node 10 Manual Flow Ignored by satellite node 11 Freeze Protect 12 Factory Test Not supported Note 1 13 IO Test N...

Page 75: ...ge 5000 PPM nviSpaceHum lev_percent Space relative humidity Typically used to override the local sensor value 0 range 100 nviSpaceTemp temp_p F Network space temperature input The network input overrides the local temperature sensor 14 range 122F nviSupplyTemp temp_p F Supply duct air input temperature This value is used for automatic heating and cooling mode changeover 32 range 212 F nviTodEvent ...

Page 76: ...tate of the window sensors and is calculated from nviWindow state and the local occupancy sensor The local sensor and nviWindow are ORed together If either the local sensor or nviWindow shows that the window is open nviWindow state SW_ON then WindowOpen shows that the window is open 1 means that the window is open and 0 means that the window is closed When the window the controller mode is switche...

Page 77: ...3 UBIT Future alarm Alm4 UBIT Future alarm Alm5 UBIT Future alarm Alm6 UBIT Future alarm Alm7 UBIT Future alarm nvoBoxFlow SNVT_ flow The airflow output of the VAV Box cooling stream 0 range 138850 cfm nvoBypass SNVT switch This allows a wall module at one node to be used to over ride the scheduled occupancy of another node The node with nviBypass bound normally does not have a wall module See the...

Page 78: ...EffectOcc SNVT occupancy Effective occupancy 0 Occupied 1 Unoccupied 2 Bypass 3 Standby OverRide SNVT occupancy Effective manual override state The result of arbitration of inputs from Network Man Occ and the Wall Module bypass signal 0 Occupied 1 Unoccupied 2 Bypass 3 Standby SchedOcc SNVT occupancy Scheduled occupancy state 0 Occupied 1 Unoccupied 3 Standby 255 Null NetManOcc SNVT occupancy Repo...

Page 79: ...ive 1 active Free1On Ubit Free digital output 1 status Controlled by network input nviFree1 0 inactive 1 active MonSwitch Ubit The state of the digital input wired to a general purpose monitor switch 1 switch is closed 0 switch is open SpcTempAlm Ubit Occupied Space Temperature alarm 0 inactive 1 active Future 2bits nvoCtlDataG2 Node Status Group Analog Data This is a limited summary of VAV analog...

Page 80: ...49 range 233 6 F nvoEffCnrSetPt SNVT temp_p Effective space temperature center setpoint EffCntrSetPt EffHtgSP EffClgSP EffHtgSP 2 30 range 100F nvoEffControlDb SNVT_ temp_diff_p Effective temperature control deadband EffControlDb EffClgSP EffHtgSP 0 range 60 F nvoEffectFlowCSP SNVT flow The effective airflow setpoint 0 range 138850 cfm nvoEffectMode SNVT hvac_mode Effective network commanded HVAC ...

Page 81: ...acking or freeze protect mode 0 range 150 nvoIaqOvr SNVT switch Allows an indoor air quality sensor to be shared with other nodes and is typically bound to nviIaqOvr on fan system nodes nvoMonSensor SNVT count_inc_f Monitor sensor This allows an unused analog input to be used as a generic network accessible value monitor 3 399999952144364E38 range 3 399999952144364E38 nvoMonSw SNVT switch Monitor ...

Page 82: ...y OccSensorOut is an output showing the current state of the hard wired occupancy sensor The valid enumerated states are listed below nvoShare In some cases a sending node master VAV controller with a wall module may be used to control the Damper ReHeat and Peripheral heat of one or more other receiving nodes satellite VAV controllers that do not have a wall module To use this feature All nodes in...

Page 83: ...n terms of percentage of flow capacity mapped to the minimum maximum flow range zero percent as minimum flow and 100 as maximum flow 0 range 100 EffectOcc SNVT occupancy Effective occupancy PeriphStg SNVT count_inc indicates the number of peripheral heat stages that should be turned on in the receiving nodes 0 range 1 PeriphCmd SNVT lev_percent indicates the amount of modulating peripheral heat th...

Page 84: ...ied 1 Unoccupied 2 Bypass 3 Standby nextState scheduled next state in the controller 0 Occupied 1 Unoccupied 2 Bypass 3 Standby 255 Null timeToNextState scheduled time to the next state in the controller 0 range 11520 minutes nvoUnitStatus SNVT hvac_status VAV Controller status Use the application UnitStatus to add this NV to your Lon controller Refer to the Appendix for details mode 0 Auto heatin...

Page 85: ...arm nvoVelSenPress SNVT press_f The calibrated value of the cooling airflow pressure sensor The sensor value minus the offset value 0 0494 range 1 5833 inWc nvoWindow aka nvoEnergyHoldOff SNVT switch This network output allows the hard wired window sensor to be used by other nodes on the network The valid states are described below Table 22 Network Variable Outputs Continued Nv field Net Data Type...

Page 86: ...balancing process optional 0 range 138850 cfm Notes This value is set by the flow balancing tool Set the value to 1000 to disable two point calibration Precision 0 MinMeasFlowAct SNVT flow 0 CFM The actual cooling flow measured at the min flow setting during the two point airflow balancing process optional 0 range 138850 cfm Notes This value is set by the flow balancing tool Set the value to 0 to ...

Page 87: ...nt is shifted up and the heating setpoint is shifted down by this value during a DLC active event 0 range 10 F Precision 1 nciCZS Commercial Zoning System Configuration type ubyte 0 NA CZS type 0 use conventional zone terminal load calculation 1 use CZS zone terminal load calculation Notes Refer to nvoTerminalLoad for details on terminal load calculation subType ubyte 0 NA Future SubType configura...

Page 88: ...cupancy is Occ Standby Bypass Unoccupied with a demand calling for cool and No Htg Demand then the Fan Speed is Inversely proportional to the demand for cooling and varies between 0 and 100 If the Mode is Morn Warmup Reheat Heat with demand for heating Or NightPurge then the Fan Speed is 00 Else FanSpeed is 0 Refer to Appendix A for fan control details FanEnableFlow SNVT lev_percent 0 Parallel fan...

Page 89: ...th a wall module and the units configured as a ShareWallModule with a valid nviShare network connection respond as satellites of the master controller providing nvoShare data PressDependent ubyte 0 Enable pressure dependent control logic in the airflow control loop Pressure dependent control does not require an airflow sensor 0 pressure independent is implemented using a cascaded control algorithm...

Page 90: ...r second This is configured based on the damper motor speed 0 01 range 100 Precision 3 MinAoChg SNVT lev_percent 0 11 Minimum output change per second default value is 0 11 pct 0 range 100 Precision 3 EnableLowFlowAlm ubyte 1 Enable low airflow alarm 0 disable low aiiflow alarm 1 enable low airflow alarm Table 23 Configuration Parameters Continued NCI Field Net Data Type Default Val AP Internal Un...

Page 91: ...on percent Applies only to pressure dependent control mode or when a pressure independent airflow sensor fails 0 range 100 Precision 1 ReheatFlowPos SNVT lev_percent 20 VAV Box Reheat cooling air value in damper position percent The cooling air damper will be at the ReheatPos at maximum reheat capacity 0 range MaxFlowPos Precision 1 EmergPress SNVT lev_percent 100 Emergency pressurization setting ...

Page 92: ...w and damper Position varies between minimum position and fixed reheat according to the temperature control loop HeatSeq ubyte 0 Heating sequence 0 reheat only 1 peripheral then reheat 2 reheat then peripheral 3 reheat peripheral then reheat airflow At the end of the sequence reheat airflow is modulated with heating demand or constant based on the ReheatControl value 0 fixed airflow at maxReheatFl...

Page 93: ...ce Reheat enabled Peripheral heat enabled 2 MornWarmNoReheat Warm air is being supplied via the duct and the temperature control is reverse acting Reheat disabled Peripheral heat enabled TR Temp Delta F 3 F Heating throttling range 2 range 30 F Precision 0 Notes The Tool will set the TR based on the value of the field Reheat IT Time sec 3100 sec Heating integral time 0 range 5000 sec Precision 0 N...

Page 94: ...flow 100 CFM VAV Box Minimum flow setpoint during the standby mode of operation 0 range 138850 cfm Precision 0 nciOccSensorOp ubyte 2 Occupancy sensor operation 1 UnoccupiedCleaningCrew When scheduled to be unoccupied and the occupancy sensor is active switch to standby for the comfort of the cleaning crew 2 ConferenceRoom When scheduled to be unoccupied stay unoccupied independent of the occupanc...

Page 95: ... MinHtRmp F hr 2 F hr Min heating setpoint ramp Heating recovery rate when an outdoor air temperature sensor value is not available 0 range 36 F hr Precision 3 OTMxHtRmp SNVT temp_p 60 F Outdoor air temperature at the max heating ramp 30 range 120 F Precision 1 OTMnHtRmp SNVT temp_p 0 F Outdoor air temperature at the min heating ramp 30 range 120 F Precision 1 nciSpSpcFrz SNVT temp_p 46 4 F Space ...

Page 96: ...w Type of SetPoint Direct OccHeat WallModSetPt ZEB 2 OccCool WallModSetPt ZEB 2 Offset OccHeat OccHeat WallModSetPt OccCool OccCool WallModSetPt 0 Ignore Wall Module Setpt 1 Use Wall Module SetPt Notes The Wall Module center setpoint is active only when the effective occupancy is Occupied or Bypass LowSetPt float 10 Low limit on wall module occupied center setpoint 10 range 100 Precision 1 Notes T...

Page 97: ...ton nciWallModZio Zio Wall Module Config These configuration parameters are used by the Tool set Zio functionality Notes Occupant override is not a configurable option The TASOWiz Zio has a fixed override feature set Occupied with fixed interval configured by nciWallModCom BypassTime 0 range 65535 min UnOccupied with a Zio user selectable UnOccupied override interval 1 range 99 days Sbus Address 1...

Page 98: ...RhOffset SNVT_ lev_percent 0 Zio on board humidity sensor calibration offset Offset value is added to the raw sensor value UserSched ubyte 0 Future option to control Zio user access to change the controller time schedule Password uint16 0000 Set end user password to access contractor mode Zio programming 0000 range 9999 Precision 0 Table 23 Configuration Parameters Continued NCI Field Net Data Typ...

Page 99: ... Controller PWM Pulse Width Modulated output allows analog modulating control of equipment using a digital output on the controller RTD Resistance Temperature Detector refers to a type of temperature sensor whose resistance output changes according to the temperature change of the sensing element TOD Time Of Day the scheduling of Occupied and Unoccupied times of operation TCU Terminal Control Unit...

Page 100: ...ure independent or variable constant volume VAV boxes are essentially air flow control devices that deliver a constant volume of air to a conditioned space at a given temperature despite a varying supply duct static pressure An air flow sensor in the inlet of the VAV box is used to measure the volume of air and the VAV box controller resets the air flow volume setpoint as the thermal load changes ...

Page 101: ... pressure are small and do not have a dramatic effect on the amount air delivered to the zone The control strategy used in single zone reheat systems is simple and involves activating electric heat or positioning a valve in conjunction to the zone temperature In most cases this is accomplished using a simple space thermostat However direct digital controllers can be used in these cases to control ...

Page 102: ...d setpoints The size of the ZEB is calculate by taking the difference between the heating and cooling occupied setpoints Effective setpoint in cooling mode Center setpoint CoolOccSpt HeatOccSpt 2 Effective setpoint in reheat mode Center Setpoint CoolOccSpt HeatOccSpt 2 The Wall Module center setpoint is active only when the effective occupancy is Occupied or Bypass Bypass Mode During Unoccupied pe...

Page 103: ...d the units configured as a ShareWallModule with a valid nviShare network connection respond as satellites of the master controller providing nvoShare data Night Purge If a terminal unit is put into the Night Purge mode the controller performs the following functions It Disables the temperature control loop Overrides the flow control loop Controls a damper to a configured percentage of maximum CFM...

Page 104: ...ooler The damper is commanded between configurable minimum and maximum positions for pressure dependant control For pressure independent control the damper is commanded between configurable minimum and maximum flow setpoints When a flow sensor input is not available control automatically switches to pressure dependant control Damper airflow control is also coordinated with CO2 sensor value when av...

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