Carrier 39L specifications Valve Troubleshooting, Recommended Gain Starting Valves

Page 109

To verify or adjust submaster default values, perform the following for each controlled device (control loop):

1.Verify that controlled devices (cooling coil valve [CCV], heating coil valve [HCV]) are properly piped and wired.

2.Using the local interface device, force each controlled device fully open and fully closed. Make sure the ac- tuators move smoothly. Sticky or sloppy actuators result in poor control. They must be corrected, otherwise it may be impossible to obtain stable control.

3.Verify that all appropriate energy sources are available: hot water, chilled water, steam, etc.

4.Verify that the system is in the Occupied mode and the supply fan is running.

5.Verify that the supply fan status indicates ON. If the fan status if OFF, the control algorithms hold the controlled devices at the failsafe position.

6.Verify that all forces have been removed.

7.Table 24 indicates recommended starting values for SMG, MPG, and MIG for constant volume and variable air vol- ume units. Verify that these values have been entered.

8.Verify/adjust the SMG. If the SMG is too large, the loop tends to oscillate (hunt). If it is too small, the loop reacts too slowly.

Verify or adjust the SMG as follows:

a.Using the local interface device, force the submaster reference of the control loop to a value above or be- low the actual sensor reading. Verify that the actua- tor responds correctly. If the actuator drives in the wrong direction, go to the submaster gain (SMG) for the control loop and reverse the sign of the gain. For example: If the submaster loop gain is 5.0, change it to −5.0.

Table 24 Ð Recommended Gain Starting Valves

GAIN

 

VALUE

CV

 

VAV

 

 

HCV MPG

8.0

 

0.3*

HCV MIG

0.3

 

1.5*

HCV SMG²

−7.5

 

−7.5

CCV MPG

8.0

 

0.3*

CCV MIG

0.3

 

1.0*

CCV SMG**

−7.5

 

−7.5

MIXD MPG

8.0

 

0.5*

MIXD MIG

0.3

 

1.5*

MIXD SMG

−7.5

 

−7.5

IGV MPG

Ð

 

0.5

IGV SMG

Ð

 

5.0

EH MPG

8.0

 

8.0

EH SMG

5.0

 

5.0

PREHEAT/AO MPG

1.0

 

0.3

PREHEAT/AO MIG

0.8

 

0.8

PREHEAT/AO SMG²

−3.0

 

−3.0

PREHEAT/AO SCV²²

100%

 

100%*

RFVC MPG

Ð

 

0.5

RFVC SMG

Ð

 

10.0

HUM MPG

2.0

 

2.0

HUM SMG

7.5

 

7.5

*Differs from default value; change the default value to obtain the recommended starting value shown.

²Values shown are for normally-open valves. If normally-closed valves are used, see Step 8.

**Values shown are for normally-closed valves. If normally-open valves are used, see Step 8.

²²Values shown are for normally-open valves. If normally-closed valves are used, subtract initial value speci®ed from 100% to obtain the correct value. Example:

100% − (SCV N.O.) = (SCV N.C.)

100% − 100% = 0%

b.Observe the operation of the controlled device for a few minutes. If the device oscillates every few sec- onds around the forced value, then lower the SMG by small amounts until the output steadies. If the out- put to the device responds to a change in temperature in small increments, then increase the SMG in small amounts until the output steadies.

NOTE: Do not be alarmed if the submaster sensor sta- bilizes at a value greater than or less than the forced value. This is termed the submaster droop offset and is normal.

9.It is not necessary to adjust the submaster loop center value, as the master loop will adjust the submaster ref- erence as required to satisfy its set point. However, it may be desirable to keep the submaster droop to a mini- mum. This is most often required for heating coil loops, (especially on steam coils where the control valve has a tendency to be oversized).

If the submaster droop is too large, adjust the SCV as follows:

If the submaster droop is positive (actual value greater than reference value), the SCV should be decreased for HCV and IGV loops and increased for CCV and MIXD loops. If the submaster droop is negative (actual value less than reference value), the SCV should be increased for HCV and IGV loops and decreased for CCV and MIXD loops.

10.Once the submaster loop is adjusted, remove all forces and proceed with veri®cation and adjustment of master loop.

11.To check the master loop, create an error in the master loop. For example: Change the actual space temperature to a value less than the heating set point or greater than the cooling set point.

Observe system (loop) response for 10 to 20 minutes to verify stable control. After 10 minutes if the output con- tinues to swing full open to full closed, lower the MPG and observe again. Do this until the loop operation is stable. After 10 minutes, if the loop does not seem to respond (little change in submaster reference), increase the MPG and observe again. Do this until stable opera- tion is achieved.

12.Once you are satis®ed with loop operation, remove all forces which may have been initiated during this procedure.

13.Repeat steps 1-12 until all loops have been checked.

VALVE TROUBLESHOOTING

General Ð To facilitate troubleshooting the valve, it may be necessary to disassemble the electronic actuator from the valve body.

All 1¤2-in. Through 11¤4-in. Electric Hot Water/ Steam Valve Assemblies Ð A high-temperature link- age extension is supplied to help insulate the hydraulic ac- tuator from heat. See Fig. 80. Mount valves so that valve stem is at a 35° to 45° angle from vertical. See Fig. 81.

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Contents Contents Installation, Operation, Start-Up InstructionsInstallation Safety ConsiderationsGeneral Page IGV ABXPIC VAVFMB Ð Filter Mixing Box Direct ExpansionMXB Ð Mixing Box Normally ClosedControl Box for Remote Mounting Aotc AFSAQ1 AQ2PIC 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 CGCDXSEN002A00 CO2 Sensor AccessoriesCGCDXSEN003A00 CGCDXGAS001A00CO2 Concentration PPM Air Quality CO2 Sensor Wall Mount Version ShownOAC Pressure Transducers Manufacturer Part Number Recommended Sensor Device WiringProcessor Sensor Module PIN noField Wiring of Sensors Stroke Recommended ActuatorsField-Supplied Mixing Box Actuator Signal Wiring High-Pressure Switch Remove Jumper HAND/OFF/AUTO Switch Tran Ð TransformerEvacuation Supply Fan Contactor Fire Shut Down Terminal BlockPres 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 Air Handling Unit AHURelay Module Outdoor Air ThermostatFunction USE Keys Local Interface Device Key UsageOperative USE Keys Functions and Subfunctions Status History Schedule Service Set Point TestSUB Function Number OavpOperation Keyboard Display Description Entry Control OperationStatus Keyboard DirectoryInputs VAV Direct Expansion Oavp Ð Outside Air Velocity Pressure AIRQUAL1 SET Point Quick Test History Example 2 Ð Reading Current Operating Modes Example 1 Ð Reading Alarm CodesKeyboard Display Comments Entry Response Display Codes AlarmsForce States Display DescriptionExample 3 Ð Forcing An Input Value State of Items ControlledExample 4 Ð Forcing An Output Value Relay StagesExample 6 Ð Logging On and Logging Off Service Function Example 5 Ð Using Quick TestKeyboard Display Comments Entry Response To LOG on To LOG OFFService Conguration Ranges and Defaults Analog Output Temperature Control Example 8 Ð Conguration of Measurements Example 7 Ð Reading and Changing Factory CongurationsExample 9 Ð User Congurations Example 10 Ð Conguration of Heating Coil Example 11 Ð Conguration of Space Temperature ResetExample 12 Ð Conguration of Loadshed Example 15 Ð Conguration of Analog Temperature Control Example 14 Ð Conguration of Alarm LimitsExample 13 Ð Conguration of Fan Tracking Example 17 Ð Service History Conguration Example 16 Ð Conguration of Discrete Temperature ControlExample 18 Ð Service/Maintenance Alarm Conguration Set Point Ranges and DefaultsExample 22 Ð Setting Daylight Savings Time Example 21 Ð Setting of Time and DateExample 20 Ð Reading and Changing System Set Points Schedule I Sample Time Schedule Example 23 Ð Setting of HolidaysKeyboard Display Comment Entry Response Programming Period Example 24 Ð Using the Schedule FunctionPeriod 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 OAT Ð Outdoor-Air Temperature MAT Ð Mixed-Air TemperatureIAQ Indoor-Air QualityConstant Volume Units Only RAT Ð Return-Air CCV Ð Cooling Coil ValveDX Submaster Gain Control Operation Variable Air Volume Units Only Page OAC Outside AirConstant Outside Air Oavp Ð Outside Air Velocity Pressure102 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 ModuleDirect Expansion DX Cooling Test Control Loop CheckoutDigital DC Volt Meter vs DC Milliamp Meter DC Milliamps DC VoltageRecommended Gain Starting Valves Valve TroubleshootingExample 25 Ð Forcing An Output Typical LinkagesIGV % HCV 10/FORCEDExample 26 Ð Heating Coil Valve Test Way Normally Open Control Module TroubleshootingExit Test Dsio Problem Possible Cause Corrective Action Unit TroubleshootingHCV, CCV, IGV OAC malfunctioning IAQ featuresMalfunctioning Metric Conversion Chart

39L specifications

The Carrier 39L is a cutting-edge air conditioning unit designed for both residential and commercial applications, providing exceptional cooling and heating performance. Equipped with advanced technologies, this system ensures optimal climate control while maintaining energy efficiency.

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Overall, the Carrier 39L is a versatile, efficient, and user-friendly air conditioning solution. Its blend of advanced technologies, energy-saving capabilities, and robust design makes it an ideal choice for those seeking reliable climate control in their spaces. Whether for residential comfort or commercial necessity, the Carrier 39L stands out as a leader in modern air conditioning.
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