Carrier 39L specifications OAC Pressure Transducers

Page 51

OAC CALIBRATION Ð Once the probe and tubing are in- stalled, input the set point to match the probe readings. Be- fore adjusting the OAVP probe, ensure that the supply-air fan is providing the maximum design air¯ow and that the outside-air dampers are adjusted for the design outdoor air¯ow intake.

To calibrate the PIC processor to match the probe loca- tion, use a precision manometer to measure the velocity pres- sure in the outdoor air duct at design conditions. Use the HSIO (local interface device) or Building Supervisor to in- put the value as the OAVP set point.

Note that the probe does not measure true velocity pres- sure; when positioned as recommended, the probe measures a velocity pressure 1.563 times that of the velocity pressure in the duct. This multiplier (magni®cation) factor varies with the probe's location, and can even be negative if the probe is located at an elbow or turn. All OAVP values displayed on the HSIO incorporate the multiplier factor to show the true duct velocity pressure.

If a precision manometer is not available, read the veloc- ity pressure value at the HSIO when the system is running at maximum design air¯ow and input that value as the set point. During normal operation, the velocity pressure is held constant as the supply fan modulates.

USING OAVP VALUES TO DETERMINE DUCT AIR- FLOW Ð It is possible to determine the air¯ow (cfm) in the outside air duct based on the readings obtained by the OAVP probe. See the following procedure.

Use the HSIO and status function ( ) to display the outside air velocity pressure (Pv) at the transducer.

Find the average velocity (V) in the duct, in fpm:

4005 =--Pv = V

Obtain the cross-sectional area of the duct in sq ft. (A). To determine the air¯ow (F) in the duct, in cfm:

V x A = F

If the air¯ow obtained by the preceding method is differ- ent from the design air¯ow or a measurement obtained with a balancer, the OAVP probe is not sensing the average duct velocity and/or the probe's multiplier factor is effectively not 1.563. To match the design or measured air¯ow to the air- ¯ow determined with the preceding formulas, relocate the probe as recommended or use the HSIO and service

function (

) to change the probe multiplier

factor.

 

FIELD-SUPPLIED OR HIGH-VELOCITY PRESSURE TRANSDUCERS Ð The default pressure transducer in- stalled at the factory (P/N HK05ZG004) has a range of 0.00 to 0.05 in. wg, which matches an air velocity range of ap- proximately 225 to 680 fpm. The maximum velocity for op- timum OAC operation and response, however, is 620 fpm. If the average duct air velocity is greater than 620 fpm, use one of the alternate transducers shown in Table 7.

For a ®eld-supplied pressure transducer, use the service

function ( ) to con®gure the OAC control with the transducer's speci®cations:

OALV = Transducer minimum output voltage OAHV = Transducer maximum output voltage OALR = Transducer low pressure

(range minimum output) value OAHR = Transducer high pressure

(range maximum output) value

Table 7 Ð OAC Pressure Transducers

 

 

 

INDICATED VELOCITY

 

TRUE VELOCITY PRESSURE

 

VELOCITY IN DUCT

 

 

 

PRESSURE AT

 

 

CARRIER

MODUS PART

RANGE

 

IN DUCT (in. wg)

 

 

 

(fpm)

TRANSDUCER (in. wg)

 

 

 

 

PART NO.

NO.

(in. wg)

 

 

 

 

 

 

 

 

 

 

Optimum

 

Theoretical

 

Optimum

 

Theoretical

 

Optimum

 

Theoretical

 

 

 

 

 

 

 

 

 

 

 

Range

 

Range

 

Range

 

Range

 

 

Range

 

Range

HK05ZG004

T40-005C-04-013

0.00 Ð 0.05

0.013 Ð 0.037

 

0.005 Ð 0.045

0.008 Ð 0.024

0.003 Ð 0.029

360

Ð

620

225 Ð

680

HK05ZG005

T40-001C-04-012

0.00 Ð 0.10

0.025 Ð 0.075

 

0.010 Ð 0.090

0.016 Ð 0.048

0.006 Ð 0.057

505

Ð

875

320 Ð

960

HK05ZG006

T40-003C-04-015

0.00 Ð 0.30

0.075 Ð 0.225

 

0.030 Ð 0.270

0.048 Ð 0.144

0.019 Ð 0.173

875

Ð 1520

555 Ð 1665

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

51

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Contents Contents Installation, Operation, Start-Up InstructionsSafety Considerations InstallationGeneral Page VAV ABXIGV PICNormally Closed Direct ExpansionFMB Ð Filter Mixing Box MXB Ð Mixing BoxControl Box for Remote Mounting AQ2 AFSAotc AQ1PIC Section Control Box Component Arrangements, 39L PIC Section Control Box Component Arrangement, 39NX Sizes PIC Section Control Box Component Arrangement, 39NX Sizes Page Address Input and Output PointsUnit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39L Sizes 03-35 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 07-21 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Unit Wiring Schematic, 39NX Sizes 26-92 115 v, Typical Page Page Page Page Page Page Terminal Signal Junction Box Connections for Optional Remote Control BoxValve Assembly Typical Hot Water Valve Wiring Duct Static Pressure Probe Chilled Water Valve WiringNema Ð National Electrical Manufacturers Association Ohms Resistance TemperatureMixed-Air Temperature Sensor HH79NZ021 Installation Supply/Return Air Temperature Sensor HH79NZ019 Enthalpy Control SettingsCOI L Comno Wall-Mounted Relative Humidity Sensor Fig Duct-Mounted Relative Humidity Sensor Locations Air¯ow Switch P/N HK06WC030 CGCDXGAS001A00 CO2 Sensor AccessoriesCGCDXSEN002A00 CGCDXSEN003A00CO2 Concentration PPM Air Quality CO2 Sensor Wall Mount Version ShownOAC Pressure Transducers Sensor Module PIN no Recommended Sensor Device WiringManufacturer Part Number ProcessorField Wiring of Sensors Stroke Recommended ActuatorsField-Supplied Mixing Box Actuator Signal Wiring Fire Shut Down Terminal Block HAND/OFF/AUTO Switch Tran Ð TransformerHigh-Pressure Switch Remove Jumper Evacuation Supply Fan ContactorPres Single-Pole, Double-Throw Spdt Relay Wiring of Device Under Discrete Output Temperature Control Wiring of Two-Stage Humidication Control Relays Duct Mounted Relative Humidity Transmitter Wiring Air Quality and Oavp Sensor Wiring Wiring of Return Fan Volume Control With IGVs Control System Pulse-Type Meter WiringCCN Communication Wiring Outdoor Air Thermostat AHUAir Handling Unit Relay ModuleLocal Interface Device Key Usage Function USE KeysOperative USE Keys Oavp Status History Schedule Service Set Point TestFunctions and Subfunctions SUB Function NumberOperation Keyboard Display Description Entry Control OperationStatus Keyboard DirectoryInputs VAV Direct Expansion Oavp Ð Outside Air Velocity Pressure AIRQUAL1 SET Point Quick Test History Example 1 Ð Reading Alarm Codes Example 2 Ð Reading Current Operating ModesKeyboard Display Comments Entry Response Display Description AlarmsDisplay Codes Force StatesRelay Stages State of Items ControlledExample 3 Ð Forcing An Input Value Example 4 Ð Forcing An Output ValueTo LOG OFF Example 5 Ð Using Quick TestExample 6 Ð Logging On and Logging Off Service Function Keyboard Display Comments Entry Response To LOG onService Conguration Ranges and Defaults Analog Output Temperature Control Example 7 Ð Reading and Changing Factory Congurations Example 8 Ð Conguration of MeasurementsExample 9 Ð User Congurations Example 11 Ð Conguration of Space Temperature Reset Example 10 Ð Conguration of Heating CoilExample 12 Ð Conguration of Loadshed Example 14 Ð Conguration of Alarm Limits Example 15 Ð Conguration of Analog Temperature ControlExample 13 Ð Conguration of Fan Tracking Set Point Ranges and Defaults Example 16 Ð Conguration of Discrete Temperature ControlExample 17 Ð Service History Conguration Example 18 Ð Service/Maintenance Alarm CongurationExample 21 Ð Setting of Time and Date Example 22 Ð Setting Daylight Savings TimeExample 20 Ð Reading and Changing System Set Points Schedule I Sample Time Schedule Example 23 Ð Setting of HolidaysExample 24 Ð Using the Schedule Function Keyboard Display Comment Entry Response Programming PeriodPeriod 1 Dene schedule period For this example, Period 6 is used for holiday only Control Operating Sequence Constant Volume and Variable Air Volume UnitsPage Page Indoor-Air Quality MAT Ð Mixed-Air TemperatureOAT Ð Outdoor-Air Temperature IAQConstant Volume Units Only RAT Ð Return-Air CCV Ð Cooling Coil ValveDX Submaster Gain Control Operation Variable Air Volume Units Only Page Oavp Ð Outside Air Velocity Pressure Outside AirOAC Constant Outside Air102 Initial Check START-UPKeyboard Display COMMENTS/ACTION Entry Response Test of Input SignalsFollowing Keyboard Display COMMENTS/ACTION Entry Response FSD NRMFor Variable Air Volume Units Test of Output SignalsElectric Heater Test Test of Output Options Using Option ModuleDC Milliamps DC Voltage Control Loop CheckoutDirect Expansion DX Cooling Test Digital DC Volt Meter vs DC Milliamp MeterRecommended Gain Starting Valves Valve TroubleshootingHCV 10/FORCED Typical LinkagesExample 25 Ð Forcing An Output IGV %Control Module Troubleshooting Example 26 Ð Heating Coil Valve Test Way Normally OpenExit Test Dsio Problem Possible Cause Corrective Action Unit TroubleshootingHCV, CCV, IGV IAQ features OAC malfunctioningMalfunctioning Metric Conversion Chart

39L specifications

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