Page 1: Table Of Contents
• FAN VOLUME CONTROL • ELECTRIC HEATER • CARRIER COMFORT NETWORK INTERFACE • OUTDOOR-AIR THERMOSTAT CONTROL SYSTEM ..... . . 64-68 Processor (PSIO Master) and Option (PSIO Slave) Modules .
Page 2: Safety Considerations
Use one of the keys provided in the 39L or 39NX instal- lation packet (located in fan section) to open the control box door. Visually inspect all components and wiring for any dam- age.
Page 3: Remote Control Box Condensate Prevention
The electronic modules are approved under UL HVAC Equipment Standard 873. PIC units are listed and 39L and 39NX units labeled by ETL (Engineering Testing Laboratory) to comply with UL Standard 1995 for heating and cooling units, and comply with NFPA (National Fire Protection Association) Standard 90A.
Page 4 LEGEND ABX — Air Blender — Airfoil — Constant Volume — Inlet Guide Vanes — Forward-Curved FMB — Filter Mixing Box MXB — Mixing Box — Product Integrated Controls — Variable Air Volume *The cv capacity rating is the ﬂow (gpm) through a valve at 1 psi pres- sure drop.
Page 5 LEGEND — Airfoil — Constant Volume — Direct Expansion — Forward-Curved FMB — Filter Mixing Box MXB — Mixing Box N.C. — Normally Closed N.O. — Normally Open — Product Integrated Controls — Variable Air Volume *The cv capacity rating is the ﬂow (gpm) through a valve at 1 psi pressure drop.
Page 6 NOTE: Dimensions in [ ] are in millimeters. Fig. 3 — Control Box for Remote Mounting Fig. 4 — Sealing Control Wiring in Flexible Conduit...
Page 7 Terminal (Marked) Terminal (Unmarked) Terminal Block Splice (Factory) Splice (Field) Wiring Factory Wiring Field Control Wiring Field Power Option or Accessory Common Potential DESCRIPTION Supply-Air Temperature Outdoor-Air Temperature Mixed-Air Temperature Space-Air Temperature Return-Air Temperature TEMP Preheat or Optional Carrier Sensor...
Page 8 ARRANGEMENT FOR SIZES 03 AND 06 ARRANGEMENT FOR SIZES 08 THROUGH 35 Fig. 5 — PIC Section Control Box Component Arrangements, 39L...
Page 9 Fig. 6 — PIC Section Control Box Component Arrangement, 39NX Sizes 07-21...
Page 10 Fig. 7 — PIC Section Control Box Component Arrangement, 39NX Sizes 26-92...
Page 11 Fig. 8 — Fan Motor Starter Circuit and PIC Control Wiring Interface — PIC Power for Control Circuit From Dedicated Source...
Page 12 MODULE, INPUT DEFAULT ADDRESS PSIO (Processor) ADDRESS 1 FLTS OARH SVP* RVP* TEMP PRES EVAC PSIO (Option) ADDRESS 31 PURG OAVP* METER — — — — DSIO (Electric Heat) ADDRESS 19 — — — — CUST DXSD — DSIO (DX without —...
Page 16 Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)
Page 17 Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)
Page 18 Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)
Page 22 Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)
Page 23 Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)
Page 24 Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)
Page 28 Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)
Page 29 Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)
Page 30 Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)
Page 34 Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)
Page 35 Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)
Page 36 Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)
Page 37 Table 2 — Junction Box Connections for Optional Remote Control Box REMOTE CONTROL BOX LOCATION MPSIO MPSIO MPSIO MPSIO MPSIO MPSIO MPSIO MPSIO MPSIO SPSIO SPSIO SPSIO SPSIO NOTES: 1. Pneumatic tubing to connect the airﬂow sensor in the fan to the remote control box is bundled with the internal PIC wiring to the junction box, but does not enter the box.
Page 38: Variable Frequency Drives
Variable-Frequency Drives — 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 high- pressure switch (if supplied) are still in the motor control...
Page 39: Valve 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. 2. Using twist-on wire connectors, connect the RED ( ) and GREEN (−) leads inside the actuator junction box to the...
Page 40: Space Temperature Sensor
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. Space Temperature Sensor (Fig. 18) — temperature sensor (SPT) is packaged and shipped inside the fan section.
Page 41 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 TEMP RESISTANCE (Ohms) (Ohms) 173,631.0 −30 38,308.7 168,222.0 −29 37,304.0 162,998.0 −28 36,328.8 157,954.0 −27...
Page 42: Outdoor-Air Temperature Sensor
The ﬁeld-installed MAT should be mounted downstream of the return air duct and ﬁlters, but as close as possible to the 39L or 39NX unit. AVOID repeated bending of copper tubing, as this will place stress on the sensor element and lead to eventual breakage.
Page 43: Enthalpy Switch
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 sen- sor junction box.
Page 44: Supply-Air Temperature Sensor
CONTROL SETTINGS RELATIVE DIAL HUMIDITY (%) SETTING 78 F 73 F (26 C) (23 C) (20 C) 73 F 68 F (23 C) (20 C) (17 C) 68 F 63 F (20 C) (17 C) (15 C) 62 F 58 F (17 C) (14 C) (12 C)
Page 45: Heat Interlock Relay
Fan Relay — The fan relay is factory wired and installed on all 39L and 39NX units. It is a SPST relay that provides a normally-open contact. The relay interfaces with the mo- tor starter circuit and automatically starts/stops the fan when the HOA switch is in the AUTO mode.
Page 46: Wall-Mounted Relative Humidity Sensor
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.
Page 47: Duct-Mounted Relative Humidity Sensor
Duct-Mounted Relative Humidity Sensor — duct-mounted relative humidity sensor and mounting tem- plate 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 or- dered for differential enthalpy control, then the sensors must be installed in both the return air and outside air ducts.
Page 48: Airﬂow Switch
The airﬂow switch (AFS) is a snap- acting SPDT switch that is factory installed in the PIC con- trol box. It senses the air supplied by the 39L or 39NX unit and provides the microprocessor module with a 24 vac dis- crete signal for fan status.
Page 49: Filter Status Switch
PIC. The 39L units use a single switch. In 39NX units, up to 3 switches can be connected in parallel. When the switches are wired in parallel, it is not possible to isolate an alarm signal to a single switch.
Page 50: Constant Outside Air (Oac) Control
Fig. 39 — Air Quality (CO (Wall Mount Version Shown) CONCENTRATION (PPM) Fig. 40 — Ventilation Rates Based on CO Constant Outside Air (OAC) Control — ture ensures a continuous supply of outside air to the unit and occupied space. The OAC control monitors the outside air velocity pressure (OAVP) with a probe and pressure trans- ducer.
Page 51: Oac Calibration
Find the average velocity (V) in the duct, in fpm: 4005 Obtain the cross-sectional area of the duct in sq ft. (A). To determine the airﬂow (F) in the duct, in cfm: V x A = F CARRIER MODUS PART RANGE PART NO. (in. wg) HK05ZG004 T40-005C-04-013 0.00 —...
Page 52: Field Wiring Connections
NOTE: Wiring is 20 gage, 2-conductor twisted cable. REMOTE LOCAL INTERFACE DEVICE (HSIO) — When ordered as part of a 39L or 39NX unit, the HSIO is factory- installed and fully wired. To reinstall the HSIO in a remote location away from the control box, refer to the factory wiring connections in Fig.
Page 53 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. IMPORTANT: Jumper may be connected from E1 to E3. Move jumper to connect E2 and E3 before installing sensor, otherwise incorrect space tem- perature values are generated.
Page 54 These relays are factory wired. Terminal block 5 (TB5) provides an easy means to wire the ﬁeld-supplied smoke con- trol panel to the PIC controller on the 39L or 39NX unit. See Fig. 49 and 50. Table 9 — Recommended Actuators...
Page 55 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. 47 — Field-Supplied Mixing Box Actuator Signal Wiring LEGEND OAD —...
Page 56 PRES — Pressurization — Return Air Damper Actuator NOTE: The return fan power circuit may be different than the supply fan starter power. Fig. 49 — Smoke Control Option Wiring Schematic (39L) LEGEND — Return Fan Relay — Supply Fan Contactor —...
Page 57 LEGEND — Analog Output EVAC — Evacuation — Exhaust Air Damper Actuator — Fire Shut Down — HAND/OFF/AUTO Switch — High-Pressure Switch — Low Temperature Thermostat — Outside Air Damper Actuator PRES — Pressurization — Return Air Damper Actuator *Factory installed and wired if ordered with exhaust box. NOTE: Return fan power circuit may be different than the supply fan starter power.
Page 58 ANALOG DEVICE FOR ANALOG OUTPUT TEMPERA- TURE CONTROL — The analog controlled device selected must be capable of receiving a 4 to 20 mA signal. Its internal impedance must not exceed 600 ohms. The power supply of the analog device must be ﬁeld in- stalled.
Page 59: Temperature Control
Field Wiring NOTE: The relay furnished is a SPDT relay with silver cadmium ox- ide 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.
Page 60 Fig. 56 — Wiring of Two-Stage Humidiﬁcation Control Relays 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. 57 — Wiring of the Duct...
Page 61 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. 61 — Wiring of Relative Humidity Transmitters...
Page 62: Air Quality Sensor
SOR — The OAVP sensor is factory installed and wired. As shown in Fig. 62, the sensor’s power wiring is connected to TB2, 9 and 10 for 39L units or TB2, 29 and 30 for 39NX units; the signal leads are connected to terminals 31 and 32 in the option module.
Page 63 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 NOTE: Connections for 39NX with integral PIC shown.
Page 64: Control System
(one point only). To connect the 39L or 39NX unit to the network, proceed as follows (Fig. 69): 1. Turn power to the PIC control box to OFF.
Page 65: Processor (Psio Master) And Option (Psio Slave)
The PSIO master and slave and DSIO are all powered from a 21 vac power source connected to terminals 1 and 2 of the power input connector on each module. Refer to the 39L or 39NX unit wiring diagram for transformer locations and wiring.
Page 66 LEGEND — Air Handling Unit CUST — Condensing Unit Status DSIO — Relay Module — Direct Expansion — Outdoor Air Thermostat — Product Integrated Control Factory Wiring Field Wiring Fig. 70 — Outdoor Air Thermostat/DSIO Wiring...
Page 67: Local Interface Device (Hsio)
Local Interface Device (HSIO) (Fig. 74) — HSIO consists of a keyboard with 6 function keys, 5 opera- tive keys, 10 numeric keys (0-9), and an alphanumeric 8-character liquid crystal display (LCD). Key use is ex- plained in Table 10. Each function has one or more subfunc- tions as shown in Table 11.
Page 68 SUB- FUNCTION Status NUMBER Current alarms Alarm history Current operating Maintenance modes history Current operating — set points System inputs — System outputs — — — — — — — — — — — — — — — — — —...
Page 69: Control Operation
Accessing Functions and Subfunctions — Table 12. Refer also to Table 11, which shows the 6 func- tions (identiﬁed by name) and the subfunctions (identiﬁed by number). Table 13 shows the sequence of all the elements in a subfunction. Table 12 — Accessing Functions and Subfunctions OPERATION To access a function, press the subfunction number and the function name key.
Page 70 STATUS Keyboard Entry Display ALARMS Current alarm display ALARM X 1st alarm ALARM X 2nd alarm ALARM X 3rd alarm ALARM X 4th alarm ALARM X 5th alarm ALARM X 6th alarm ALARM X 7th alarm ALARM X 8th alarm ALARM X 9th alarm ALARM X...
Page 71 STATUS Keyboard Entry Display INPUTS 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 Static pressure SFS X Supply fan status ENT X...
Page 72 SCHEDULE Keyboard Entry Display OVRD X Number of hours to extend occupied mode of schedule 1 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, .0 or CLR = no) TUE X Tuesday ﬂag (x = entry code)
Page 73 SERVICE CONFIGURATIONS Keyboard Entry Display Conﬁguration of cooling COOLCOIL (chilled water coil or DX) MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value HHL X High humidity limit SMR X Submaster reference value...
Page 74 SERVICE CONFIGURATIONS Keyboard Entry Display Description Conﬁguration of indoor air quality AIRQUAL1 and AQ sensor no. 1 MPG X Master proportional gain MIG X Master integral gain XDP X Maximum damper position Air quality sensor 1 low voltage Q1LV X point Air quality sensor 1 high voltage Q1HV X...
Page 75 SERVICE CONFIGURATIONS Keyboard Entry Display Conﬁguration of analog temperature/ AO CTRL preheat coil control MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value FOV X Fan off value SEN X Controlling temperature sensor...
Page 76 QUICK TEST Keyboard Entry Display INPUTS Factory/ﬁeld test of inputs SAT X Supply air temperature OAT X Outside air temperature SPT X Space temperature RAT X Return air temperature ENT X Enthalpy switch status SFS X Airﬂow switch status FRZ X Freezestat SP X Static pressure...
Page 77 QUICK TEST Keyboard Entry Display ELE HEAT Factory/ﬁeld test of electric heat EHS1 X Stage 1 test STG1 TST Testing of electric heat stage 1 EHS2 X Stage 2 test STG2 TST Testing of electric heat stage 2 EHS3 X Stage 3 test STG3 TST Testing of electric heat stage 3...
Page 78: Summary Display
IGV position is being limited by the Demand Limit option. Units must be conﬁgured for demand limiting to enter the available on units connected to the Carrier Comfort Network (CCN). Unoccupied Heating (23) — Indicates that the space tem- perature is below the Unoccupied Heating set point and the unit is on.
Page 79 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 main- taining set point by using a mixture of outside and return air only.
Page 80: History Function
MODE (DISPLAY RETURN SUPPLY CODE) Pressurization (34) Purge (36) Evacuation (35) Fire Shutdown (37) (Set point) — This subfunction displays the current operating system set points. To view set points, depress to display the occupied heat set point. Continue to depress to display all the various system set points.
Page 81: Programming Functions
— Displays the latest service date on the local in- terface device. The last 2 service dates are displayed at the Building Supervisor. TEST FUNCTION — The test function operates the Quick Test diagnostic program. — Displays the status of all inputs. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - —...
Page 82 Table 16 — Service Conﬁguration Ranges and Defaults SERVICE SUBFUNCTION NUMBER 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,...
Page 83 Table 16 — Service Conﬁguration Ranges and Defaults (cont) SERVICE SUBFUNCTION NUMBER 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...
Page 84 Requires password entry in 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.
Page 85 — Used to read or change factory conﬁguration of heating coil. See Example 10. Example 10 — Conﬁguration of Heating Coil KEYBOARD DISPLAY COMMENTS ENTRY RESPONSE Heat coil ﬁeld conﬁguration HEATCOIL subfunction of service function MPG 8.0 Master proportional gain MPG N Master proportional gain value is changed to N, where N = new value...
Page 86 — Used to read or change ﬁeld conﬁguration of fan tracking. See Example 13. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - —...
Page 87 Example 16 — Conﬁguration of Discrete Temperature Control KEYBOARD DISPLAY ENTRY RESPONSE DO CTRL Discrete temperature control conﬁguration subfunction of service function SEN 1 Controlling temperature sensor conﬁgured to sensor 1. Sensor codes as follows: 1 - Supply-air temperature sensor (standard) 2 - Outdoor-air temperature sensor (standard)
Page 88: Set Point Function
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 sub- function.To adjust any parameter after enabling the func- tion, press until desired parameter is displayed.
Page 89 The air handler can be conﬁgured for an applicable holiday/ shutdown schedule. This function can only be used if the PIC is connected to the Carrier Comfort Network. The net- work will send a holiday message (ﬂag) to the unit on the appropriate holiday.
Page 90 Example 24 — Using the Schedule Function KEYBOARD DISPLAY ENTRY RESPONSE PROGRAMMING PERIOD 1: 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 UNO 00.00 Start of unoccupied time (end of period).
Page 91 Example 24 — Using the Schedule Function (cont) KEYBOARD DISPLAY ENTRY RESPONSE PROGRAMMING PERIOD 3: For this example, Period 3 is used on Wednesday only. OCC 00.00 OCC 7.00 UNO 00.00 UNO 21.30 MON NO TUE NO WED NO WED YES THU NO FRI NO SAT NO...
Page 92: Control Operating Sequence
Constant Volume and Variable Air Volume Units TWO-POSITION DAMPER CONTROL — Two-position damper control opens or closes ﬁeld-supplied and installed two-position outdoor-air dampers in order to provide mini- mum outdoor air ventilation. If the supply fan is OFF, the damper is closed. If the sup- ply fan is ON, the control determines if the unit is in the OCCUPIED mode.
Page 93 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 sen- sors are: space temperature sensor, outside-air temperature sensor, mixed-air temperature sensor, supply-air tempera- ture sensor, and return-air temperature sensor.) The discrete output is turned ON/OFF as required to maintain the user conﬁgured set point.
Page 94 INDOOR-AIR QUALITY (IAQ) — This function main- tains the correct occupied ventilation rate using CO 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 out- door air are admitted during the Occupied period to main- tain the ventilation rate at its set point or pollutants at or below the conﬁgured set points of the air-quality (AQ) sen-...
Page 95 Fig. 76 — Indoor-Air Quality (IAQ) Control Operation LEGEND — Air Quality Sensor — Indoor-Air Quality MAT — Mixed-Air Temperature OAT — Outdoor-Air Temperature — Relative Humidity SAT — Supply-Air Temperature SPT — Space Temperature VAV — Variable Air Volume...
Page 96: Constant Volume Units Only
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. Each mode must be energized individually from the approved building ﬁre alarm...
Page 97 Fig. 77 — Cooling (DX and Chilled Water) Control Operation LEGEND CCV — Cooling Coil Valve — Constant Volume — Direct Expansion RAT — Return-Air Temperature — Relative Humidity...
Page 98 LEGEND — Direct Expansion MAT — Mixed-Air Temperature RAT — Return-Air Temperature SAT — Supply-Air Temperature Fig. 78 — DX Submaster Gain Control Operation...
Page 99: Variable Air Volume Units Only
K factor. TWO-STEP DEMAND LIMITING (Available on Units Connected to the Carrier Comfort Network Only) — If the Demand Limit option is enabled, the control receives and accepts redline alert and loadshed commands from the Network Loadshed option.
Page 100 HEATING COIL CONTROL — The heating coil control ad- justs the steam or hot water valve. Heat is primarily used for morning warm-up or Occupied Heating with the valve modu- lated to maintain desired return-air temperature. If the supply fan is OFF, the heating valve is modulated to maintain a desired minimum duct temperature (fan off value).
Page 101 LEGEND — Outside Air — Constant Outside Air OAVP — Outside Air Velocity Pressure — Variable Air Volume Fig. 79 — Constant Outside Air (OAC) Control Operation...
Page 102 This value is then used by the cool- ing coil algorithm. TWO-STEP DEMAND LIMITING (Available on Units Connected to the Carrier Comfort Network Only) — If the Demand Limit option is enabled, the control receives and accepts redline alerts and loadshed commands from the Net- work Loadshed option.
Page 103: Start-Up
Initial Check IMPORTANT: Do not attempt to start unit, even mo- mentarily, until the following steps have been com- pleted. 1. Verify unit has been installed per the Installation, Start- Up, and Service Instructions shipped inside the unit. 2. Verify that all auxiliary components (valves, sensors, etc.) have been installed and wired to the PIC control box.
Page 104 KEYBOARD DISPLAY ENTRY RESPONSE INPUTS Field testing of inputs (X = current value. All temperatures should be 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.
Page 105 KEYBOARD DISPLAY ENTRY RESPONSE FSD NRM At Terminal Block 3, short Terminals 1 and 2. Verify that the display changes to FSD ALM. Verify the following: • Supply fan is OFF • Outside air and exhaust dampers (if applicable) close •...
Page 106 KEYBOARD DISPLAY ENTRY RESPONSE 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. The hot water or steam valve returns to its 0% position.
Page 107 Table 20 — Test of Output Options Using Option Module KEYBOARD DISPLAY ENTRY RESPONSE RFVC X RFVCTEST Verify that the return fan IGVs stroke to their fully open position. HUM1 % The return fan IGVs should close. HUM1TEST 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.
Page 108: Electronic Valve Actuator Field Test
CCN training. RED and To Check Operation of Analog Outputs — control algorithms of the 39L and 39NX use the master/ submaster loop concept. The master loop monitors the mas- ter sensor (the sensor which tries to maintain the desired set point), and calculates the submaster reference required to do so.
Page 109: Valve Troubleshooting
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.
Page 110: Valve Assemblies
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 ⁄ -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.
Page 111: Control Module Troubleshooting
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.
Page 112: Module Replacement (Psio, Dsio)
COMMUNICATIONS LEDs Fig. 83 — Module Address Selector Switch and LED Locations If only the PSIO slave or DSIO module indicate commu- nication failure, check the affected module for proper seat- ing. If the condition persists even though connections are correct, replace the module as described in the following section.
Page 113: Unit Troubleshooting
PROBLEM POSSIBLE CAUSE PIC control is OFF Faulty connections PIC control has incorrect time Supply fan HOA switch in OFF position Safety controls are tripped Unit does not run PIC control left in Quick Test (Display shows Mode 38) Unit is conﬁgured for and is currently in Demand Limit Mode (CV units only) Unit is in Smoke Evacuation or Fire Shut- down mode (Display shows 35 or 37)
Page 114 PROBLEM POSSIBLE CAUSE No fan status Mixed-air dampers forced closed to outside air No power to damper actuator Mixed-air dampers Incorrect reading from space temperature sensor will not operate or supply-air temperature sensor Conﬁguration error No fan status Inlet guide vanes (IGVs) forced closed No power to IGV actuator(s) Unit not main- taining desired...
Page 115 PROBLEM POSSIBLE CAUSE OAC not enabled Fan status is OFF According to occupancy schedule, building is unoccupied Incorrect unit type Constant outside air Outside-air velocity pressure (OAVP) sensor (OAC) malfunctioning not functioning OAVP sensor not conﬁgured OAVP value does not match that of measure- ment equipment IAQ not enabled According to occupancy schedule, building is...
Page 116: Metric Conversion Chart
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. Form 39L,NX-2SI Pg 116...

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