39L,NX Central Station Air-Handling Units With Product Integrated Controls (PIC) Installation, Operation, and Start-Up Instructions CONTENTS Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 Service Area Requirements . . . . . . . . . . . . . . . . . . . 2 Remote Control Box Option . . . . . . . . . . . . . . . . . .
[Variable Air Volume] units only) and high-pressure switch (VAV units). An ON/OFF switch is included to shut off the power to the control box. PIC environmental limitations are as follows: IMPORTANT: This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance with these instructions may cause radio interference.
Mount the remote control box as follows: 1. Loosen and remove the 4 nuts securing the control panel in the control box. 2. Remove the control panel from the box; set the panel and nuts aside for reassembly later. 3. Mount the control box to the Unistrutt support using fieldsupplied fasteners. 4.
ABX AF CV IGV FC FMB MXB PIC VAV — — — — — — — — — LEGEND Air Blender Airfoil Constant Volume Inlet Guide Vanes Forward-Curved Filter Mixing Box Mixing Box Product Integrated Controls Variable Air Volume *The cv capacity rating is the flow (gpm) through a valve at 1 psi pressure drop. Fig.
AF CV DX FC FMB MXB N.C. N.O. PIC VAV LEGEND — Airfoil — Constant Volume — Direct Expansion — Forward-Curved — Filter Mixing Box — Mixing Box — Normally Closed — Normally Open — Product Integrated Controls — Variable Air Volume *The cv capacity rating is the flow (gpm) through a valve at 1 psi pressure drop. Fig.
NOTE: Dimensions in [ ] are in millimeters. Fig. 3 — Control Box for Remote Mounting Fig.
LEGEND (Fig. 5-12, Table 2) AFS AO AOTC AQ1 AQ2 C CCW CH CR CUST CV CW CWV DHH DO DOTC DSIO DTCC DX DXS DXSD EHS ELEC ENT EQUIP EVAC EXD FLTS FSD FU GND HIR HOA HPS HSIO HT HUM HWV IGV LTT MAD MAT MPSIO — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — OAD OARH OAT OAVP — — — — Airflow Switch Analog Output Analog Output Temperature Control Air Quality Sensor, No. 1 Air Quality Sensor, No.
ARRANGEMENT FOR SIZES 03 AND 06 ARRANGEMENT FOR SIZES 08 THROUGH 35 Fig.
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Table 1 — Input and Output Points MODULE, DEFAULT ADDRESS PSIO (Processor) ADDRESS 1 PSIO (Option) ADDRESS 31 DSIO (Electric Heat) ADDRESS 19 DSIO (DX without Electric Heat) ADDRESS 19 DSIO (DX with Electric Heat) ADDRESS 49 INPUT SAT OAT MAT RH LTT SPT RAT SP* AFS FLTS OARH ENT SVP* RVP* DHH TEMP PRES EVAC PURG FSD AQ1 AQ2 OAVP* METER — — — — — — — — CUST DXSD — — — — — — CUST DXSD — — — — — — INPUT TYPE AI AI AI AI DI AI AI AI DI DI AI DI AI AI DI AI DI DI DI DI AI AI AI DI — — — — — — — — DI DI —
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Table 2 — Junction Box Connections for Optional Remote Control Box REMOTE CONTROL BOX LOCATION MPSIO MPSIO MPSIO MPSIO TB3 MPSIO TB3 MPSIO TB2 TB2 TB2 MPSIO TB2 TB2 TB2 TB2 TB2 TB2 TB2 TB2 TB2 TB2 MPSIO MPSIO TB2 TB2 TB2 TB2 SPSIO SPSIO TB2 TB2 SPSIO SPSIO CONTROL BOX TERMINAL 2 3 8 9 10 28 10 13 19 20 6 40 21 22 7 6 27 28 8 7 15 16 38 37 17 18 23 24 38 37 25 26 12 11 FAN SECTION JUNCTION BOX SIGNAL SAT — BLK SAT — RED MAT — BLK MAT — RED FLTS — BLK FLTS — RED LTT — K3 LTT — K1 OAD — BLK OAD — WHT OAD — G
Variable-Frequency Drives — The input signal for the inverter must be 4 to 20 mA. Use a 2-conductor 20 AWG (American Wire Gage) cable (single twisted pair, unshielded) to connect the input of the inverter to the output of the PIC control terminals. See Fig. 8. Wire the inverter so that if it is placed in the manual or bypass mode the low temperature thermostat and the highpressure switch (if supplied) are still in the motor control circuit to protect the unit.
2. Using twist-on wire connectors, connect the RED (1) and GREEN (−) leads inside the actuator junction box to the other 2 wires in the cable. Note the polarity of each wire. 3. Connect the positive signal wire (connected to the RED lead) to pin 46 on the processor module. Connect the negative signal wire (connected to the GREEN lead) to pin 47 on the processor module. VALVE WIRING Valves MUST be connected to the correct processor module terminal to operate properly.
FACTORY WIRING FIELD WIRING NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes. Fig. 16 — Chilled Water Valve Wiring Avoid corner locations. Allow at least 3 ft between the sensor and any corner. Airflow near corners tends to be reduced, resulting in erratic sensor readings. The sensor should be mounted approximately 5 ft up from the floor, in the area representing the average temperature.
NEMA — National Electrical Manufacturers’ Association Fig. 18 — Space Temperature Sensor (P/N HH51BX001) Table 3 — Thermistor Resistance vs. Temperature Values for Space Temperature Sensor, Return-Air Temperature Sensor, and Supply-Air Temperature Sensor RESISTANCE (Ohms) 173,631.0 168,222.0 162,998.0 157,954.0 153,083.0 148,378.0 143,833.0 139,442.0 135,200.0 131,101.0 127,139.0 123,310.0 119,609.0 116,031.0 112,571.0 109,226.0 105,992.0 108,863.0 99,837.3 96,910.2 94,078.4 91,338.6 88,687.3 86,121.
Outdoor-Air Temperature Sensor (Fig. 19) — The outdoor-air temperature (OAT) sensor is shipped inside the fan section. The OAT sensor continuously monitors the temperature of the air outside the building. The integral shield prevents ice formation on the sensor conductors. A fieldsupplied conduit junction box is required for installation. See Fig. 20. Position the OAT sensor so that it accurately senses only the outdoor-air temperature.
NOTE: This sensor uses a resistance temperature device (RTD) element. Polarity is not a consideration. When space does not allow working inside the duct, mount as follows (Fig. 22): 1. Open a duct penetration on the opposite side of the sensor junction box. 2. Wrap the element around a 3⁄4-in. PVC pipe, cut holes near the center of the duct on both sides and feed the pipe with sensor element through the hole. 3. Secure the seal around the PVC pipe.
4. Remove the adhesive backing from the gasket; attach the gasket to the outside of the junction box, aligning the holes in the gasket with the holes in the box. 5. Attach the junction box to the duct with the 2 screws provided. 6. Insert the probe assembly through the compression fitting and into the duct. Tighten screws one half-turn past finger tight. Do not overtighten. For distances up to 500 ft, use 2-conductor 20 AWG cable to connect the sensor to the PIC control box terminals.
Heat Interlock Relay (Fig. 27) — The heat interlock relay (HIR) is factory wired and installed on VAV units only. It is a single-pole, double-throw (SPDT) relay that provides normally-open and normally-closed contacts to interface with air terminal units. It allows the air terminals to open when the PIC unit goes into the heating mode. The contacts are silver cadmium oxide and are rated as follows: 48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .
Wall-Mounted Relative Humidity Sensor (Fig. 30) — The wall-mounted relative humidity sensor is packaged and shipped inside the fan section. It is installed on interior walls to measure the relative humidity of the air within the occupied space. The use of a junction box to accommodate the wiring is recommended for installation. The sensor may be mounted directly on the wall, if acceptable by local codes.
Duct-Mounted Relative Humidity Sensor — The duct-mounted relative humidity sensor and mounting template are packaged and shipped inside the fan section. The sensor is installed in either the return air ductwork or in the outside air ductwork. If 2 relative humidity sensors are ordered for differential enthalpy control, then the sensors must be installed in both the return air and outside air ducts. If the sensor is used for control of a humidifier, install the sensor in the return air duct.
Airflow Switch — The airflow switch (AFS) is a snapacting SPDT switch that is factory installed in the PIC control box. It senses the air supplied by the 39L or 39NX unit and provides the microprocessor module with a 24 vac discrete signal for fan status. See Fig. 35. A length of plenum tubing connects the switch to the probe located on the fan side plate. The airflow switch range is 0.05 to 2.0 in. wg with a deadband of 0.02 in. wg at minimum set point and 0.1 in. wg at maximum set point.
3. To change or check calibration, use a T assembly with 3 rubber tubing leads. Attach one lead to the HPS and another to an accurate manometer with the appropriate range. Apply pressure through the third lead and approach set point slowly. 4. Adjust set point to at least 0.5 in. wg greater than configured static pressure set point. Filter Status Switch — The filter status switch (FLTS) is factory-installed in the filter section on all PIC-equipped units. The switch is a snap-acting SPDT switch.
1 220 9A3 N O I AT R O O ZER P R O C R IE N SPA R R ER UC SD : T40 in. : er . 1 mb E Nu 0 - 0 UR art S : P ES nge PR Ra T + OU A C AN TR C- 1 - 00 of 2 04 - 01 w r ate RE SU ES PR HI LO - IN ac. V 24 Fig. 39 — Air Quality (CO2) Sensor (Wall Mount Version Shown) Fig. 41 — OAVP Transducer (P/N HK05ZG004) Fig. 42 — OAVP Probe (P/N 35DN40007001) CO2 CONCENTRATION (PPM) Fig.
If the airflow obtained by the preceding method is different from the design airflow 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 airflow to the airflow determined with the preceding formulas, relocate the probe as recommended or use the HSIO and service function ( ) to change the probe multiplier factor.
Select a 20 AWG twisted pair, no shield cable. Connect as per table below: Field Wiring Connections — All field wiring must comply with National Electric Code (NEC) and all local requirements.
LEGEND ENT MAT OAT RAT SPT — — — — — Enthalpy Switch Mixed-Air Temperature Sensor Outside-Air Temperature Sensor Return-Air Temperature Sensor Space Temperature Sensor Field Wiring NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes. Fig.
Table 9 — Recommended Actuators PART NO. VOLTAGE (50/60 Hz) VA (24 vac) IMPEDANCE (Ohms) SIGNAL INPUT (mA) HF27BB006 HY27BB001* HF27BB010 24 24 24 18 60 44 82.5 250.0 82.5 4 to 20 4 to 20 4 to 20 *Shipped with drive HF39CB001, which must be field-installed on actuator. DAMPER AREA (sq ft) Parallel Opposed 8.4 10.8 42 54 106 137 TORQUE (in.-lb) STROKE 15 50 190 2 in. 180° 31⁄2 in.
LEGEND OAD — Outside Air Damper Actuator RAD — Return Air Damper Actuator Factory Wiring Field Wiring *Field-installed if only outside air damper is used. NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes. Fig. 47 — Field-Supplied Mixing Box Actuator Signal Wiring LEGEND OAD — Outside Air Damper Actuator Field Wiring Fig.
LEGEND AO EVAC EXD FSD HOA HPS LTT OAD PRES RAD — — — — — — — — — — Analog Output Evacuation Exhaust Air Damper Actuator Fire Shut Down HAND/OFF/AUTO Switch High-Pressure Switch Low Temperature Thermostat Outside Air Damper Actuator Pressurization Return Air Damper Actuator RFR SF SFR TB TRAN — — — — — Return Fan Relay Supply Fan Contactor Supply Fan Relay Terminal Block Transformer Remove Jumper Factory Wiring Field Wiring NOTE: The return fan power circuit may be different than the supply fan starte
LEGEND AO EVAC EXD FSD HOA HPS LTT OAD PRES RAD — — — — — — — — — — Analog Output Evacuation Exhaust Air Damper Actuator Fire Shut Down HAND/OFF/AUTO Switch High-Pressure Switch Low Temperature Thermostat Outside Air Damper Actuator Pressurization Return Air Damper Actuator RFR SF SFR TB TRAN — — — — — Return Fan Relay Supply Fan Contactor Supply Fan Relay Terminal Block Transformer Factory Wiring Field Wiring *Factory installed and wired if ordered with exhaust box.
DISCRETE OUTPUT DEVICE UNDER TIMECLOCK CONTROL — The factory-supplied SPDT relay must be field installed and wired. (Fig. 52.) The relay contacts are rated as follows: 48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor The relay provides a set of contacts (normally open and normally closed) using no. 6 screw terminals while the 24 vdc coil connections are through 1⁄4-in. quick connects.
Field Wiring Field Wiring Fig. 55 — Wiring of the Modulating Valve for Analog Output Humidity Control NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows: 48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor Two-Stage Humidification Control Relays — Two SPDT relays with silver cadmium contacts are shipped with the unit when 2-stage humidification control is requested. See Fig. 52.
Field Wiring NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows: 48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor Fig. 56 — Wiring of Two-Stage Humidification Control Relays The power for the relative humidity transmitters may be sourced from the valve 24 vac power source at wire no. 6 and 7 or at wire no. 4 and 5.
Field Wiring Fig. 59 — Duct Mounted Relative Humidity Transmitter Wiring Fig. 60 — Wall Mounted Relative Humidity Transmitter Wiring LEGEND RH — Relative Humidity Field Wiring Fig.
AIR QUALITY SENSOR — Air quality (AQ) sensors are CO2 sensors shipped inside the fan section for field installation. To wire the sensors after they are mounted in the conditioned air space and return air duct, see Fig. 62 and the instructions shipped with the sensors. For each sensor, use two 2-conductor 20 AWG twisted-pair cables (unshielded) to connect the separate 24 vac power source to the sensor and the sensor to the option module (PSIO slave) terminals.
LEGEND RVP — Return Velocity Pressure Transducer SVP — Supply Velocity Pressure Transducer Field Tubing NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes. Fig. 64 — Fan Volume Control — Differential Pressure Transducer (P/N HK05ZG007) Factory Wiring Field Wiring Fig. 66 — Wiring of Return Fan Volume Control with Variable Frequency Drive NOTE: Connections for 39NX with integral PIC shown.
Pulse-Type Meter (Fig. 67) — Monitors power usage, which is passed through the Carrier Comfort Network (CCN) for use by the loadshed module of the Building Supervisor. The meter must provide a dry contact signal (not exceeding 4 Hz maximum). Using a 2-conductor 20 AWG shielded twistedpair conductor cable, connect one wire to terminal 35 of the option module and the other wire to terminal 36.
Fig. 69 — CCN Communication Wiring All system software and operating intelligence is in the processor (PSIO master) module, which controls the unit. This module monitors and controls conditions through input and output ports and through the option (PSIO slave) and relay (DSIO) modules. The machine operator communicates with the PSIO master through the local interface device (HSIO). Communications between the PSIO and other modules is accomplished by a 3-wire sensor bus that runs in parallel between modules.
AHU CUST DSIO DX OAT PIC — — — — — — LEGEND Air Handling Unit Condensing Unit Status Relay Module Direct Expansion Outdoor Air Thermostat Product Integrated Control Factory Wiring Field Wiring Fig.
Local Interface Device (HSIO) (Fig. 74) — The HSIO consists of a keyboard with 6 function keys, 5 operative keys, 10 numeric keys (0-9), and an alphanumeric 8-character liquid crystal display (LCD). Key use is explained in Table 10. Each function has one or more subfunctions as shown in Table 11. These functions are described in greater detail in the Control Operation section of this book. The HSIO can be factory-or field-installed, and can be remotely mounted if necessary.
Table 11 — Functions and Subfunctions SUBFUNCTION NUMBER 1 FUNCTION History Schedule Service Set Point Test Current alarms Alarm history Maintenance history — 4 5 System outputs — 6 — — Daylight savings time configuration Holiday configuration — Quick test of inputs Quick test of outputs Quick test of electric heat Quick test of DX cooling Exit quick test — 7 — — — — 8 — — — — 9 — — — — 10 — — — — 11 — — — — 12 — — — — 13 — — — — 14 — — — — 15 — — —
CONTROL OPERATION Accessing Functions and Subfunctions — See Table 12. Refer also to Table 11, which shows the 6 functions (identified by name) and the subfunctions (identified by number). Table 13 shows the sequence of all the elements in a subfunction. Display Functions SUMMARY DISPLAY — Whenever the keyboard has not been used for 10 minutes, the display automatically switches to an alternating summary display.
Table 13 — Keyboard Directory Keyboard Entry STATUS Display ALARMS STATUS Description Keyboard Entry Current alarm display Display Description MODES Current operating modes Mode 1 Mode 2 ALARM X 1st alarm MODE X ALARM X 2nd alarm MODE X ALARM X 3rd alarm SETPOINT Current operating set points ALARM X 4th alarm OHSP X Occupied heating set point ALARM X 5th alarm OCSP X Occupied cooling set point ALARM X 6th alarm UHSP X Unoccupied heating set point ALARM X 7th alarm UCSP X Un
Table 13 — Keyboard Directory (cont) STATUS Keyboard Entry Display INPUTS STATUS Description System inputs SPT X Space temperature SAT X Supply air temperature RAT X Return air temperature OAT X Outside air temperature OAT X Outside air temperature forced (x = forced value) SP X Supply fan status ENT X Enthalpy switch status ENT X Enthalpy switch status forced (x = forced value) RH X Relative humidity Display IGV X Static pressure SFS X RH X Keyboard Entry Description Inlet guide
Table 13 — Keyboard Directory (cont) Keyboard Entry SCHEDULE Display OVRD X Description Keyboard Entry SERVICE CONFIGURATIONS Display Description LOG ON Number of hours to extend occupied mode of schedule 1 Enter password to log on LOGGEDON Log on okay PERIOD 1 Define period 1 of time schedule 1 OCC X Start of occupied time UNO X Start of unoccupied time MON X Monday flag (x = entry code) (1 = yes, .
Table 13 — Keyboard Directory (cont) Keyboard Entry SERVICE CONFIGURATIONS Display Description Keyboard Entry SERVICE CONFIGURATIONS Display Description COOLCOIL Configuration of cooling (chilled water coil or DX) MIXADMPR Configuration of mixed air damper MPG X Master proportional gain MPG X Master proportional gain MIG X Master integral gain MIG X Master integral gain MDG X Master derivative gain MDG X Master derivative gain SMG X Submaster gain SMG X Submaster gain SCV X Submaste
Table 13 — Keyboard Directory (cont) Keyboard Entry SERVICE CONFIGURATIONS Display Description Configuration of indoor air quality AIRQUAL1 and AQ sensor no.
Table 13 — Keyboard Directory (cont) Keyboard Entry SERVICE CONFIGURATIONS Display Description SET POINT Keyboard Entry Display Description Configuration of analog temperature/ preheat coil control SETPOINT System set points MPG X Master proportional gain OHSP X Occupied heating set point MIG X Master integral gain OCSP X Occupied cooling set point UHSP X Unoccupied heating set point UCSP X Unoccupied cooling set point SPSP X Static pressure set point SASP X Supply air set point CFSP
Table 13 — Keyboard Directory (cont) Keyboard Entry QUICK TEST Display Description Keyboard Entry QUICK TEST Display Description INPUTS Factory/field test of inputs OUTPUTS SAT X Supply air temperature HCV X Entering heating coil valve test OAT X Outside air temperature HCV TEST Testing heating coil valve SPT X Space temperature CCV X Entering cooling coil valve test RAT X Return air temperature CCV TEST Testing cooling coil valve ENT X Enthalpy switch status MIXD X Entering mixe
Table 13 — Keyboard Directory (cont) Keyboard Entry QUICK TEST Display Description Keyboard Entry HISTORY Display Description Factory/field test of electric heat ALARMHST Alarm history EHS1 X Stage 1 test ALARM X Latest alarm STG1 TST Testing of electric heat stage 1 ALARM X Previous alarm EHS2 X Stage 2 test ALARM X Previous alarm STG2 TST Testing of electric heat stage 2 ALARM X Previous alarm EHS3 X Stage 3 test ALARM X Previous alarm STG3 TST Testing of electric heat stage
STATUS FUNCTION — The status function shows the current status of alarm (diagnostic) codes, operating modes, set points, all measured system temperatures, output values, and input values. These subfunctions are defined on pages 78-80. Refer to Table 11 for additional information. The modes are explained below: Temperature Reset (21) — Indicates that the unit is using temperature reset to adjust the supply-air set point. The set point is modified based on space temperature (VAV units only).
Table 14 — Display Codes Occupied Cooling (31) — Indicates that the unit is in the Cooling mode to satisfy its Occupied Cooling set point. Occupied Fan Only (32) — Indicates that the unit is maintaining set point by using a mixture of outside and return air only. No mechanical heating or cooling is being used. Nighttime Free Cooling (33) — Indicates that the supply fan is on and using outside air to precool the space served by the unit. Unit must be configured for nighttime free cooling ( ).
Table 15 — State of Items Controlled MODE (DISPLAY RETURN SUPPLY OUTDOOR- RETURN- EXHAUST SUPPLY FAN RETURN HEAT ELECTRIC CODE) FAN FAN AIR AIR DAMPER INLET GUIDE FAN IGV INTERLOCK HEAT ALL DAMPER DAMPER VANES (IGV) RELAY STAGES Pressurization (34) Off On Open Close Close Open to Close On Off Static Pressure Set Point Purge (36) On On Open Close Open Open to Open to On Off Static Pressure B D cfm Set point Evacuation (35) On Off Close Close Open Close Open Off Off Fire Shutdown (37) Off Off Close Open Clos
Example 5 — Using Quick Test — Displays the latest service date on the local interface device. The last 2 service dates are displayed at the Building Supervisor. KEYBOARD DISPLAY ENTRY RESPONSE ELEC HT TEST FUNCTION — The test function operates the Quick Test diagnostic program. — Displays the status of all inputs. Stage 1 test STG1 TST Pressing ENTR starts the fan test. Fan automatically starts. There is an 11-second delay while the inlet guide vanes open and the heat stage is enabled.
Table 16 — Service Configuration Ranges and Defaults SERVICE SUBFUNCTION NUMBER 3 4 5 6 7 8 9 10 11 12 CV DX NTFC VAV *Value CONFIGURATION VALUE RANGE Unit Type (0 = CV, 1 = VAV) Cooling Type (0 = none, 1 = chilled water coil, 2 = DX) DX Cooling Stages Heating Type (0 = none, 1 = hot water/steam coil, 2 = electric heater) Electric Heater Stages Mixed Air Dampers (0 = none, 1 = analog, 2 = 2-position) Indoor-Air Quality Type (1 = single gas, 2 = differential/2 gases) Mixed-Air Temperature Protect
Table 16 — Service Configuration Ranges and Defaults (cont) SERVICE SUBFUNCTION NUMBER 13 14 15 16 17 18 20 21 22 23 24 26 CONFIGURATION VALUE RANGE Night Purge Duration (minutes) Night Purge Low Temperature Damper Position (% output) Night Purge High Temperature Damper Position (% output) Constant Outside Air Master Proportional Gain Constant Outside Air Master Integral Gain Constant Outside Air Master Derivative Gain Constant Outside Air Submaster Gain OAVP Sensor Low Voltage Point OAVP Sensor
Example 8 — Configuration of Measurements — Used to verify software version. KEYBOARD ENTRY -----------------------------------------------— Used to verify and change factory configuration. Requires password entry in . See Example 7. UNIT 0 UNIT 1 NOTE: When more than one unit is connected to the Carrier Comfort Network, the element address must be changed on all but one unit. The element address system default is 1, and element address numbers cannot be repeated.
— Used to read or change factory configuration of heating coil. See Example 10. — Used to read or change configuration of night purge option. ------------------------------------------------ Example 10 — Configuration of Heating Coil KEYBOARD DISPLAY ENTRY RESPONSE HEATCOIL — Used to read or change configuration of constant outside air option and outside air velocity pressure sensor.
Example 14 — Configuration of Alarm Limits — Used to read or change field configuration of fan tracking. See Example 13. KEYBOARD ENTRY -----------------------------------------------— Used to read or change factory configuration of humidity control.
Example 16 — Configuration of Discrete Temperature Control KEYBOARD ENTRY DISPLAY RESPONSE DO CTRL SEN 1 SEN 34 TYP 0 Example 18 — Service/Maintenance Alarm Configuration KEYBOARD DISPLAY COMMENTS ENTRY RESPONSE SRV/MTN Service/Maintenance alarm configuration subfunction of service function Service/Maintenance alarm SMAL 2 limit is 2000 hrs (hours x 1000) SMAL 5 Service/Maintenance alarm limit is changed to 5000 hrs (This represents the cumulative number of hours the fan must be energized before a servi
Example 21 — Setting of Time and Date Reading and Changing Set Points — Example 20 shows how to read and change system set points. Other set points can be changed by following the same procedure. Refer to Table 13 for the display sequence of set points in each subfunction.To adjust any parameter after enabling the function, press until desired parameter is displayed. Key in new value and press . If input is within the allowable range, the display shows the parameter and new value.
Figure 75 shows a Schedule I example for an office building with the unit operating on a set point schedule. The schedule is based on building occupancy with 3-hour offpeak cool down period from midnight to 3 am following weekend shutdown. To learn how this sample schedule can be programmed, see Example 24. The same scheduling procedures can be used to set optional discrete output Schedule II. Subfunctions through define schedule of air handler (Schedule I).
Example 24 — Using the Schedule Function KEYBOARD DISPLAY ENTRY RESPONSE PROGRAMMING PERIOD 1: Define schedule period 1 OCC 00.00 Start of occupied time. For this example, first period should start here (at midnight) so no entry is needed Start of unoccupied time (end of period). For this example, period 1 should end at 3:00 am Period 1 ends at 3:00 am Monday is not flagged for period 1.
Example 24 — Using the Schedule Function (cont) Example 24 — Using the Schedule Function (cont) KEYBOARD DISPLAY COMMENT ENTRY RESPONSE PROGRAMMING PERIOD 3: For this example, Period 3 is used on Wednesday only. KEYBOARD DISPLAY COMMENT ENTRY RESPONSE PROGRAMMING PERIOD 6: For this example, Period 6 is used for holiday only. OCC 00.00 Start of occupied time OCC 00.00 Start of occupied time OCC 7.00 Occupied time will start at 7:00 am Start of unoccupied time (end of period 3).
CONTROL OPERATING SEQUENCE NTFC is scheduled to run only between the hours of 3:00 am and 7:00 am. NIGHT PURGE — During the unoccupied period, this feature starts the fans and opens the mixed-air dampers to remove stagnant air and airborne pollutants from the building space. If the current time is within the configured night purge duration, the control reads the outdoor air temperature and determines the mixed-air damper position.
DISCRETE OUTPUT/ANALOG INPUT CONTROL — The discrete output is controlled as a function of a temperature sensor connected to the 39L or 39NX unit. (Applicable sensors are: space temperature sensor, outside-air temperature sensor, mixed-air temperature sensor, supply-air temperature sensor, and return-air temperature sensor.) The discrete output is turned ON/OFF as required to maintain the user configured set point. The controlling sensor is identified and its value is read.
INDOOR-AIR QUALITY (IAQ) — This function maintains the correct occupied ventilation rate using CO2 as an indicator of occupancy level or controls the levels of volatile organic compounds (VOCs) or other indoor air pollutants by modulating the mixed air dampers. Varying quantities of outdoor air are admitted during the Occupied period to maintain the ventilation rate at its set point or pollutants at or below the configured set points of the air-quality (AQ) sensors. See Fig. 76.
LEGEND AQ IAQ MAT OAT RH SAT SPT VAV Fig.
set point, and a ‘K’ factor in minutes/degrees to calculate a start time offset, which is the time in minutes that the system should be started in advance of the occupied time. The control monitors its results and adjusts the K factor to assure that the Occupied set point is achieved at time of occupancy. SMOKE CONTROL — When the 39L or 39NX unit is equipped with an optional smoke control and a fire system is installed, 4 modes are provided to control smoke within areas serviced by the air-handling unit.
LEGEND CCV CV DX RAT RH Fig.
LEGEND DX MAT RAT SAT Fig.
If the fan is ON, the control reads the space temperature sensor and calculates the supply-air temperature required to satisfy conditions. Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature to determine the number of heat stages required to satisfy conditions. The required stages are energized one at a time, with 2-second intervals between stages.
FAN VOLUME CONTROL — Fan volume control adjusts the inlet guide vanes or inverter in a VAV system. The return fan IGVs or inverters are modulated to maintain a constant differential cfm value between the supply and return fans in the system. If the supply fan is OFF, the return fan inlet guide vanes are closed and no signal is sent to the return fan inverter. If the supply fan is ON, the control reads the supply fan differential pressure transmitter and computes the supply cfm.
OA OAC OAVP VAV LEGEND — Outside Air — Constant Outside Air — Outside Air Velocity Pressure — Variable Air Volume Fig.
SPACE TEMPERATURE RESET — The space temperature reset is used to reset the supply-air temperature set point upward as the space temperature falls below the Occupied Cooling set point. As space temperature falls below the cooling set point, the space temperature is reset upward as a function of the reset ratio. The reset ratio is the degrees of change in supply-air temperature per degree of space temperature change.
START-UP Initial Check Unit is shipped with the NTFC, Demand Limit, Temperature Reset, Optimal Start, Occupied Heating, and Fan Tracking functions disabled. If these functions are desired, refer to Control Operation, Programming Functions section beginning on page 81. 9. Check tightness of all electrical connections. 10. Turn on control power by turning the ON/OFF switch located in the PIC control box to ON. 11. Perform Quick Test to make sure controls are operating properly. See the following section.
Table 18 — Test of Input Signals KEYBOARD ENTRY DISPLAY RESPONSE COMMENTS/ACTION INPUTS Field testing of inputs (X = current value. All temperatures should be 6 2 degrees F from actual) SAT X Verify that the supply-air temperature sensor reading agrees with the actual temperature. OAT X Verify that the outdoor-air temperature sensor reading agrees with the actual temperature. SPT X Verify that the space temperature sensor reading agrees with the actual temperature.
Table 18 — Test of Input Signals (cont) KEYBOARD ENTRY DISPLAY RESPONSE FSD NRM COMMENTS/ACTION At Terminal Block 3, short Terminals 1 and 2. Verify that the display changes to FSD ALM. Verify the following: • • • • • • MTR XXX Supply fan is OFF Outside air and exhaust dampers (if applicable) close Return fan is OFF Supply fan IGVs close (VAV units) Return fan IGVs close (VAV units equipped with return fan) Heat Interlock relay is OFF (VAV units) OAVP 0.
Table 19 — Test of Output Signals KEYBOARD ENTRY DISPLAY RESPONSE COMMENTS/ACTION OUTPUTS Field testing of outputs. (Set HOA switch to OFF.) HCV % Press ENTR if unit is equipped with a hot water or steam valve. Otherwise press HCV TEST Verify that the hot water or steam valve strokes to its 100% position. CCV % The hot water or steam valve returns to its 0% position. Press ENTR if unit is equipped with a chilled water valve.
Table 20 — Test of Output Options Using Option Module KEYBOARD ENTRY DISPLAY RESPONSE COMMENTS/ACTION RFVC X RFVCTEST Verify that the return fan IGVs stroke to their fully open position. HUM1 % HUM1TEST The return fan IGVs should close. Verify that the return fan IGVs, if so equipped, return to their fully closed position. If equipped with single- stage analog humidification control, verify that the modulating valve goes to its fully open position.
Table 22 — Direct Expansion (DX) Cooling Test KEYBOARD ENTRY DISPLAY RESPONSE COMMENTS/ACTION NOTE: Only the configured number of stages are tested and appear on the display. DX COOL Entering field test DX cooling coil. (Set the HOA switch to AUTO.) DXS1 X STG1 TST The fan starts. If fan has IGVs, the IGVs open to 30%. After an 11-second delay, the 1st stage of DX cooling is turned ON. DXS2 X The 1st stage of DX cooling is turned OFF.
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 actuators move smoothly. Sticky or sloppy actuators result in poor control. They must be corrected, otherwise it may be impossible to obtain stable control. 3.
To remove the actuator from the high-temperature valve linkage extension or from the 2-way normally-open valve mounting nut, proceed as follows: 1. Secure the high-temperature linkage extension or 15⁄8-in. valve mounting nut to prevent turning. 2. Turn the actuator base (by hand) counterclockwise off the high-temperature linkage extension mating threads or off the mating threads of the valve mounting nut. Do not exert force on the upper housing! If necessary, a 15⁄8-in.
Example 27 — Cooling Coil Valve Quick Test (2-Way Normally Closed) TO REASSEMBLE ACTUATOR TO VALVE BODY: All 2-way normally-open valves: 1. Push the valve stem completely down and close seat valve. NOTE: It may be necessary to shut down the system pump to ensure valve stem is closed. 2. Loosen locknut and screw stem extension down fully on valve stem to adjust stem extension for proper closure. 3. Attach actuator to valve linkage mounting bracket and secure with self-tapping screws. 4.
If only the PSIO slave or DSIO module indicate communication failure, check the affected module for proper seating. If the condition persists even though connections are correct, replace the module as described in the following section. Module Replacement (PSIO, DSIO) — The PSIO master module controls the standard unit functions, the PSIO slave module controls many optional functions, and the DSIO module controls electric heat and/or DX cooling.
UNIT TROUBLESHOOTING PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Check for correct power or blown fuses (F2). Correct any deficiencies. Check LEDs on control module (PSIO). If LED is not solidly illuminated, check for loose connections. If all wires and connectors are secure, replace PSIO module as described on page 112. Verify control shows correct time. If incorrect, enter correct time. Verify HOA switch is in the AUTO position. Check low-temperature thermostat and high-pressure switch (VAV units only).
UNIT TROUBLESHOOTING (cont) PROBLEM POSSIBLE CAUSE No fan status Mixed-air dampers forced closed to outside air No power to damper actuator Mixed-air dampers will not operate Incorrect reading from space temperature sensor or supply-air temperature sensor Configuration error No fan status Inlet guide vanes (IGVs) forced closed Unit not maintaining desired static pressure (VAV units only) No power to IGV actuator(s) Loose IGV linkage Incorrect reading from static pressure transducer Configuration error
UNIT TROUBLESHOOTING (cont) PROBLEM POSSIBLE CAUSE OAC not enabled Fan status is OFF According to occupancy schedule, building is unoccupied Incorrect unit type Constant outside air (OAC) malfunctioning Outside-air velocity pressure (OAVP) sensor not functioning OAVP sensor not configured OAVP value does not match that of measurement equipment IAQ not enabled According to occupancy schedule, building is unoccupied IAQ priority level is incorrect Set point too high Air quality (AQ) sensors not operating A
METRIC CONVERSION CHART Copyright 1996 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 3 PC 201 Catalog No. 533-913 Printed in U.S.A.
