48FP,JP,NP 50FB,FP,JB,JP,NB,NP Single-Package Heating/Cooling Units With Product Integrated Controls Controls, Operation, and Troubleshooting CONTENTS Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Carrier Comfort Network System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 PIC Rooftop Information . . . . . . . . . . . . . . . . . . . . . .
CONTENTS (cont) Page START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-56 Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Set Fan Status and Check Filter Switches . . . . 44 • SUPPLY FAN STATUS SWITCH (FS) • CHECK FILTER SWITCH (CFS) Auxiliary Switch, Power Exhaust . . . . . . . . . . . . . 45 Adjusting Set Points . . . . . . . . . . . . . . . . . . . . . . . . 46 • SET POINT FUNCTION Program Time Sequences . . . . . . . . . . . . . . . . . . .
CCN BUS ROOFTOP UNIT ROOFTOP UNIT PIC PIC BUILDING SUPERVISOR NETWORK OPTIONS ROOFTOP UNIT ROOFTOP UNIT PIC PIC HEATING/COOLING UNITS REMOTE CCN SITE AUTODIAL GATEWAY TO ADDITIONAL TERMINALS TERMINAL SYSTEM MANAGER ASI TCU ROOFTOP UNIT NON CARRIER HVAC EQUIPMENT DAV AIR TERMINAL TCU TCU DAV AIR TERMINAL FID AIR DISTRIBUTION-DIGITAL AIR VOLUME CONTROL (DAV) ASI CCN DAV FID HVAC PIC TCU — — — — — — — LEGEND Air Side Interface Carrier Comfort Network Digital Air Volume Field-Installed D
using inputs from the TSM for rooftop unit control operation. This is automatic, and does not require a configuration change to the standard rooftop unit PIC. bus with 2 or more PIC- or FID-controlled pieces of equipment is referred to as a Carrier Comfort Network (CCN) system. The CCN communications bus conveys commands, data, and alarms between all elements of the system. Any system element connected to the bus may communicate with any other system element, regardless of their physical locations.
CCB CB CLO CR DSIO DU EQUIP FU GND HIR HR — — — — — — — — — — — Control Circuit Breaker Circuit Breaker Compressor Lockout Control Relay Module Relay Dummy Terminal Equipment Fuse Ground Connection Heat Interlock Relay Heater Relay LEGEND HSIO IDC IFCB MM NEC OFC PL PRI PSIO TB TRAN — — — — — — — — — — — Keyboard and Display Module Induced-Draft Contactor Indoor Fan Circuit Breaker MotormasterT Device National Electrical Code Outdoor-Fan Contactor Plug Assembly Primary Processor Module Terminal Block T
Table 1 — Thermistors and Unit Operation Control Pressure Transducers SENSOR DPT1* SPT1* DPT2* SPT2* T1 T2 T3 T4 T5 T6 T7 LOCATION AND FUNCTION Unit Operation Control Pressure Transducers Compressor A located at the discharge service valve — Senses discharge pressure (replaces T3) Compressor A located at the LPS connection on the compressor instead of LPS1 (lowpressure switch) — Sense suction pressure Compressor B located at the discharge service valve — Senses discharge pressure (replaces T4) Compressor B
LEGEND NEMA — National Electrical Manufacturers’ Association Fig. 3 — Space Temperature Sensor (T-55) LEGEND NEMA — National Electrical Manufacturers’ Association SENSOR COVER Fig.
CONTROLS AND FUNCTIONS The internal logic circuits of the PIC controls consist essentially of seven sets of control loops that provide direction and control for the major unit systems. These seven major unit systems are: • Cooling Stages • Staged Heating • Economizer Position • Building Pressure • Supply Fan Volume • Heating Coil (position) • Humidifier (staged or position) Each of these unit systems is controlled by a set of logic loops.
Table 2 — HSIO Keypad Key Usage FORCED VALUE — A submaster reference value that overwrites a calculated value from a function master loop or a real value direct from a sensor. Forced values may be generated by another control function (example: Fire Shutdown) or by service personnel in order to achieve an override or test function. GAIN — A parameter or correction factor used in a control loop calculation that adjusts the responsiveness and sensitivity of the control loop.
Table 3 — HSIO Keypad and Display Module Functions and Subfunctions SUB FUNCTION NO.
Table 4 — Accessing Functions and Subfunctions OPERATION To access a function, press the subfunction number and the function name key. The display will show the subfunction group. KEYPAD ENTRY To move to the other elements, scroll up or down using the arrow keys. When the last element in a subfunction has been displayed, the subfunction group name will be repeated.
Table 7 — Configuring Units of Measure in Display DESCRIPTION HOW TO CONFIGURE Select Units of Measure SET POINT UNITS RANGE Metric = 1; English (Imperial) = 0 (equivalent to RUN status) indicates unit control has been enabled. The unit will operate according to occupancy schedules and function set points. Standby is Mode 25. NOTE: Units are shipped from the factory in Standby (‘‘STBY YES’’) mode. Installers must exit Standby to start unit (by using the HSIO or by using the Remote Start option).
supply fan must be ON for cooling control to operate. The Master Loop will survey Space Temp and Space Temp Offset inputs, then calculate CCSR value. The CSL surveys actual SAT, then calculates number of capacity stages required to satisfy space load. Stages of cooling capacity are initiated. (From zero stages, there will be a 1.5 to 3 minute delay before first stage is initiated.
Table 9 — Configuring Fan Operation (CV) DESCRIPTION Select Auto or Continuous Operation (CV only) HOW TO CONFIGURE *If value changed, enable Data Reset before leaving SET POINT RANGE FANM Auto = 0; Cont = 1* .
HEATING — The Staged Heating Control routine determines the staging of the available heating system to maintain space comfort conditions. The heating cycle is available during the Occupied period (for all CV units, and for VAV units when enabled), during Optimal Start/Morning Warm-up routine, and during the Unoccupied period. A modified Heating function is also available during Dehumidification and Reheat functions.
To select the Unoccupied Heating set point, scroll down to UHSP. The current set point value will be displayed. The default is 55 F. The range of acceptable values is 40 to 80 F. To change the set point, press the numbers of the new set point (example: ) and then press ENTER . To enable Occupied Heating (VAV units) press . Enter the password. Press to enter into the User Configuration subfunction. Scroll down to OHEN (Occupied Heating Enable).
Table 14 — Sensor Set Point Alert Limits and Default Values NAME DESCRIPTION SUBFUNCTION OCCUPIED SPACE STATUS ALERT DEFAULT (LOW) ALERT DEFAULT (HIGH) LOW LIMIT HIGH LIMIT Occupied 20.25 in. wg 0.25 in. wg -0.5 in. wg 0.5 in.
To Set Daylight Savings Time and Set Occupancy Schedules, Schedule I, see the Program Time Sequences on page 50. See Table 16. Configuration — To configure: 1. Connect control wires from external controlled device at PSIO2 Channel 44 (terminals J6/41 and J6/42). 2. Enter Time Schedules. Press . (See Schedule Function section on page 50 for detailed instructions.) Define Period 1 (Occupied, Unoccupied). Define Periods 2 thru 8 (as required).
OPTIMAL STOP (CV Units Only) — The control will compute a time period prior to end of the current Occupied period, then allow space temperature to drift up/down to the Expanded Occupied Set Point by end of scheduled Occupied period. Optimal Stop is mode 29. The control will calculate a bias time (in minutes) that will be subtracted from end-of-Occupied time.
Economizer operation is permitted if all of the following conditions exist: • System is NOT in Heating mode • Outdoor air enthalpy (via switch or humidity differential) is acceptable • Outside air temperature is less than Space Temperature If economizer operation is permitted, Master Loop checks for Cooling System operation. If cooling is ON, the economizer Submaster Reference (ECONSR) will be set to the minimum position.
O ENTHALPY CONTROLLER ENTHALPY SETTING DIAL Fig. 9 — Enthalpy Controller Location Fig. 11 — Enthalpy Controller A B TR C D SO TR1 SR + 2 + 24 VAC SUPPLY FROM ECONOMIZER CONTROL SECTION (RED TO TR, BRN TO TR1) TO SENSOR MOUNTED ON BACK OF CONTROL S (HH57AC078 + SENSOR) 3 1 GRAY WIRE FROM ECONOMIZER HARNESS LED RED WIRE FROM ECONOMIZER SWITCH 3 (NORMALLY CLOSED) NOTES: 1. Remove factory-installed jumper across SR and + before connecting wires from HH57AC078 sensor. 2.
NIGHTTIME FREE COOLING (NTFC) — Nighttime Free Cooling will start the supply fan on cool nights to pre-cool the structure mass by using only outside air. Nighttime Free Cooling is mode 33. See Table 20. Nighttime Free Cooling is not permitted if the system is already in Unoccupied Heating mode, Unoccupied Cooling mode, or Optimal Start mode; or if space temperature reading or outside-air temperature readings are not available.
Table 22 — Power Exhaust Fan Operation Definitions ITEM BP BPSO BPSP BPSR EF ECON PED PES PWRX to PWRX. The current configuration will be shown. Press ENTER to set the configuration to modulating power exhaust. The acceptable range of values is 0 to 2, where 0 is no fan, 1 is non-modulating, and 2 is modulating.
mode will be overridden by simultaneous closure of any of signal contacts for Pressurization, Smoke Purge, or Fire Shutdown and the system will be placed in Fire Shutdown mode. To configure, make the field-connection at channel 39. Smoke Control Group — This group includes Pressurization, Evacuation, Smoke Purge, and Fire Shutdown. PRESSURIZATION — Pressurization mode is used to prevent entrance of smoke into the conditioned space in the event of fire or other emergency condition.
7. If IAQ is Priority 3 (low) and an IAQ sensor is connected, the control will evaluate IAQ sensor value. If the IAQ sensor value exceeds the user-configured alert limits, an alert will be generated (viewed at the HSIO), and broadcast to the CCN system supervisor (if applicable). The economizer damper position is not affected. Special Ventilation Group — This group includes Indoor Air Quality (IAQ), IAQ (Pre-Occupancy) Purge, Outdoor Air CFM Control (OAC), and IAQ/OAC Reheat.
e. Configure High Reference. Scroll down to IRH. Default is 2000 ppm. Range is 0 to 5000 ppm. IAQ Algorithms IQMP = ECON + 100 x IAQG x (Demand)/IAQS Where: ECON = Current position of economizer damper (Demand) = IAQS - IAQ NOTE: IQMP will not be recalculated until (Demand) exceeds 3% of IAQS. provide complete exchange of indoor air with fresh air. Duration of purge mode is user-configured (typically 5 minutes). The IAQ Purge is Mode 28. See Table 25. The factoryinstalled economizer option is required.
Table 28 — Outdoor Air Control Definitions ITEM ECON OAC OCS OCMX VENT 2. Select the OAC set point. Press and to enter the subfunction. Scroll down to OCS. The default is 1 cfm. The range is 1 to 50,000 cfm. 3. Select the OAC Maximum Damper Position. Press to enter the subfunction. Scroll down to OCMX. The default is 50%. The range is 0 to 100%.
Dehumidification and Humidifier Group — This group includes Dehumidification and Reheat, and Humidifier Controls. DEHUMIDIFICATION AND REHEAT — Dehumidification will override comfort condition set points in order to deliver cooler air to the space and satisfy a humidity set point at the space or return air humidity sensor. Reheat will energize a gas heating section concurrent with compressor operation should the dehumidification operation result in cooling of the space down to Occupied Heating set point.
Sequence of Operation (Discrete-Output Device) 1. If the supply fan is off, then the humidifier will be off. 2. If the Occupancy Schedule indicates Unoccupied mode, the humidifier will be off. 3. When the humidity level at the sensor drops below the set point, the output signal will energize the spray pump control until the set point is satisfied. 4. When the humidity level at the sensor exceeds the set point, the spray pump control will be deenergized. Configuration — To configure: 1.
to Unoccupied mode. An external control signal (24-vac) is required. NOTE: Unit cannot be returned to Standby mode from a remote signal. Standby can only be re-entered via HSIO command. Application of the 24-v signal will switch the unit from current mode (Standby or Unoccupied) to Occupied. The unit will initiate Occupied modes as determined by set points. Removal of the 24-v signal will return control to Unoccupied mode. Install a LOCAL/REMOTE (SPST-OFF/ON) manual switch in the 24-v signal input.
in the coil (by opening control valve on low temperature signal). The function also turns the supply fan off and returns economizer dampers to minimum position. A contact set (Normally Open, 24-vac pilot duty) is required. Contact set will close on fall in temperature at freezestat set point. The control options module (PSIO2) is required for operation. Sequence of Operation 1. Freezestat signal contacts close on temperature drop. 2. A 24-v signal applied to Channel 41. 3.
Table 37 — Head Pressure Control Definitions ITEM HPSP MMAS SCT The control options module (PSIO2) and pressure transducers are required. Sequence of Operation — The control will read channels 3 and 4 as Discharge Pressure Transducer inputs. Alarms 76 and 77 (High Discharge Pressure) will be permitted. The control will read Channels 5 and 6 as Suction Pressure Transducer inputs.
VAV Systems — During occupied and biased occupied periods on VAV systems, the rooftop unit PIC uses the AOZT from the TSM to replace the rooftop unit PIC return-air temperature sensor value. During unoccupied periods, the rooftop unit PIC uses the AZT from the TSM instead of the rooftop unit PIC space temperature and return-air temperature sensor values.
NOTE: Either the T-55 or the T-56 sensor must be connected for CV applications to function. INSTALLATION INFORMATION Control Wiring — See Fig. 14 - 29 for connections to unit. The recommended types of control wiring for unit devices are listed in Table 40. SENSORS — Sensors should be wired using single twisted pairs of 20 AWG (American Wire Gage) conductor cable rated for the application, except for the T-56 accessory sensor which requires 3-conductor cable.
Remote Reset — The unit controls allow for remote input from an energy management system (EMS) or some other input to offset the space temperature set point on CV applications or to reset the supply-air set point on VAV applications. A remote, isolated, 2 to 10 vdc signal may be used to achieve this purpose. See Fig. 27 for wiring details. Remote RUN/UNOCCUPIED Control — This control is for applications where it is necessary to control the unit occupancy mode from a remote timeclock or switch. See Fig.
RED BLK RED BLK SIZES SIZES 054-074 034-048 TB3 TB2 1 1 3 2 RED RED RED BLK BLK BLK TO PROCESSOR MODULE NO. 1 SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4 SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION SIZES 054-074 TB3 1 3 SIZES 034-048 TB2 1 2 RED RED BLK BLK RED BLK RED BLK TO PROCESSOR MODULE NO.
PSIO NO. 2 J7 PRESSURIZATION 19 SIZES 034-048 SIZES 054-074 TB2 TB2 14 5 SMOKE PURGE 22 EVACUATION 25 FIRE SHUTDOWN 28 Fig. 17 — Differential Enthalpy Sensor Fig. 20 — Smoke Control FIELD-SUPPLIED 24-V ISOLATED POWER SUPPLY 24V J7 16 9 + 1 INDOOR AIR QUALITY ACY LEGEND DSIO — Relay Module 10 - 17 5 PSIO NO. 2 Fig. 18 — Remote RUN/UNOCCUPIED Control Fig. 21 — Indoor Air Quality ACCESSORY OUTSIDE AIR RELATIVE HUMIDITY GRA PSIO NO. 2 CH.
TO 24-V ISOLATED TRANSFORMER BRN OUTDOOR AIR + 24V RED 24V - PNK BLK PSIO NO. 2 PSIO NO. 2 CH. 35 J6 CFM ACY + 37 HYD VLV LEGEND TB — Terminal Block Field Wiring Component Terminal - 38 HYDRONIC VALVE ACTUATOR Terminal Block Terminal LEGEND TB — Terminal Block Field Wiring Component Terminal Fig. 22 — Outdoor Airflow Control Fig. 25 — Hydronic Heating PSIO NO. 2 J6 PSIO NO. 2 41 J7 31 SIZES 034-048 SIZES 054-074 TB2 TB2 14 5 42 RELAY PART. NO.
PSIO NO.
Timed Discrete Output — A timed discrete output is available for switching on and off items such as parking lot lights. Time Schedule II ( SCHD to SCHD) operates this function. A special relay (part no. HK35AB001) with a 20 vdc holding coil must be field wired. See Fig. 23. Air Pressure Tubing — Before options such as inlet guide vanes (IGV), variable frequency drive (VFD), and/or modulating power exhaust can operate properly, the pneumatic tubing for pressure sensing must be installed.
Fig. 31 — Auxiliary Control Box Location; Size 054-074 Units LEGEND BP DP PL PS Fig.
BP CF DP FS PECB PEC — — — — — — LEGEND Building Pressure PER Check Filter PS Duct Pressure RFC Fan Status RFCB Power Exhaust Circuit TB Power Exhaust Contactor — — — — — Power Exhaust Relay Pressure Switch Return Fan Contactor Return Fan Circuit Breaker Terminal Block Fig.
connector, if desired. To wire the RJ11 connector into the CCN (Fig. 35): 3. Remove the 4-pin female plug from the fuse and control circuit breaker bracket in the main control box, and connect the wires as follows: a. Insert and secure the red (1) wire to terminal 1 of the 4-pin plug. b. Insert and secure the white (ground) wire to terminal 2 of the 4-pin plug. c. Insert and secure the black (2) wire to terminal 3 of the 4-pin plug. 4.
LEGEND CCN — Carrier Comfort Network COM — Common COMM — Communications GND — Ground SW — Switch T — Terminal TH — Thermostat, Heating *Constant volume applications only. Fig. 35 — Space Sensor to Communication Bus Wiring Set Fan Status and Check Filter Switches START-UP SUPPLY FAN STATUS SWITCH (FS) — A snap-acting singlepole, double-throw (SPDT) differential pressure switch is factory mounted in the unit auxiliary control box.
Table 42 — Filter Switch Set Point FILTER TYPE 2-in. Throwaway 2-in. Pleated Bag With Pre-filters INCREASED PRESSURE DROP TO ‘‘DIRTY’’ FROM PIVOT POINT 0.30 in. wg 0.75 in. wg 0.75 in. wg 6. Repeat the quick test. 7. Repeat Steps 5 and 6 as necessary until proper operation is observed. 8. Replace damper motor top cover.
6. Press to change to the demand limit set point function. 7. Press once to change the display to LSP 50 (the default value). ENTER , and the display will change to LSP 60. 8. Press The unit will reduce capacity to 60% when the loadshed command is in effect. Adjusting Set Points SET POINT FUNCTION — The Set Point function allows the user to view the current values set for the unit. From this function, the user can change the values. See Table 43.
Table 43 — Set Point Directory SET POINT Subfunction 1 SET POINTS Keypad Entry Display SET POINT OHSP X Comment System set points Occupied heat set point X OCSP X Occupied cool set point X UHSP X Unoccupied heat set point X UCSP X Unoccupied cool set point X SPSP X Static pressure set point X SASP X Supply air set point X HUSP X Humidity set point X HCFO X Heat Coil Fan On/Off X 2 DEMAND SET POINTS DEMAND Demand limit set points LSP X Loadshed set point X 3 DATE AND TIME TIME Curren
Table 44A — Set Point Ranges and Defaults (English Units) DISPLAY BPSP ECSO* HHOR† HTMP HUSP IAQS† LIMT† LSP LTMP MDP† NTLO† OACS† OCSP OHSP PES1† PES2† RTIO† SASP SPSP UCDB* UCSP UHDB* UHSP IAQ NFTC PPM VAV — — — — LEGEND Indoor-Air Quality Nighttime Free Cooling Parts Per Million Variable Air Volume SET POINT DESCRIPTION Building pressure set point Economizer set point offset High humidity override (percent) High temperature minimum position Humidity set point (percent)** IAQ set point Reset limit (F)
Table 45 — Operating Modes TO CONFIGURE OPTION Press Display TO ENABLE MODE Press* Display MODE NO.
Table 46 — Setting Daylight Savings Time KEYBOARD ENTRY ENTER ENTER ENTER ENTER ENTER ENTER DISPLAY DAYLIGHT COMMENTS Daylight savings time field configuration of set point function ENM X Month when daylight savings time begins ENM 4 Daylight savings time configured to start month 4 (April) END X Day of month when daylight savings time begins END 16 Daylight savings time configured to start on the 16th of the month ENT X Time of day when daylight savings time begins ENT 2.
NOTE: If the unit is connected to a DAV system, the unit time schedule is ignored. The time schedule should still be entered into the unit in case communications are lost with the network. 7. Scroll through the rest of the days (press ) to to be sure that no other days have been flagged. Suppose, for this example, Tuesday was flagged for this period. To change this period from YES to NO, press ENTER , and the display will change to TUE NO. Start Unit To Program Period 2: 1.
Table 47 — Schedule Directory Subfunction 1 OVERRIDE Keypad Entry 2 PERIOD 1 PERIOD 1 3 PERIOD 2 4 PERIOD 3 5 PERIOD 4 6 PERIOD 5 7 PERIOD 6 8 PERIOD 7 9 PERIOD 8 — Comments Number of Override Hours (0 to 4 Hours); Schedule I Period 1; Time Schedule I OCC HH.MM Occupied Time UNO HH.
2. Master Loop will survey occupancy status, Supply Air Set Point (SASP), and any Supply Air Temperature Reset command, then issue Cooling Coil Submaster Reference (CCSR) to Cooling Submaster Loop (CSL). 3. The CSL surveys actual SAT, then calculates number of capacity stages required to produce the CCSR leaving the unit. 4. Stages of cooling capacity are initiated. From zero stages, there will be a 1.5 to 3 minute delay before the first stage is initiated.
ADAPTIVE OPTIMAL STOP (CV Applications Only) — Optimal stop is used to allow space temperature to drift to an expanded occupied set point during the last portion of an occupied period. The control calculates a stop time offset, (the time in minutes prior to the scheduled unoccupied time) during which expanded heating and cooling set points can be used. Adaptive optimal stop utilizes space temperature, an expanded occupied set point, and a ‘‘K’’ factor to calculate stop time offset.
Table 48 — Head Pressure/Fan Cycling Control CONTROL LOGIC UNIT CONFIGURATION STANDARD (with standard SCT sensors) (MMAS = Yes) (TRNS = No) With Accessory Sensors (Pressure Transducers) (MMAS = Yes) (TRNS = Yes) STAGE OFM OFF SCT < (HPSP − 37 F) for 90 secs AND Stage 2 motors OFF SCT > (HPSP − 15 F) 2 SCT > HPSP (start delayed 60 secs after start of compressor, unless SCT > 143 F) SCT < (HPSP − 35 F) for 120 secs 1 SCT > 138 F SCT < (HPSP − 37 F) for 90 secs AND Stage 2 motors OFF 2 MotormasterT
Table 49 — Fan Sequence of Operation UNIT SIZES FAN ARRANGEMENT STAGE CIRCUIT FAN RELAY OUTPUT RELAY CONTROLLED FAN(S) CONTROLLED 1 Com MM MMC OFM1 2 Com OFC1 — OFM2 1 Com MM MMC OFM2 1 OFC1 — OFM1 2 OFC2 — OFM3 Com MM MMC1 MMC2 OFM3 OFM4 1 OFC1 — OFM1 2 OFC2 — OFM2 Com MM MMC1 MMC2 OFM3 OFM5 1 OFC1 — OFM1 2 OFC2 — OFM2, OFM4 034-038 044,048 2 1 054,064 2 1 074 2 LEGEND MM — Head Pressure Control Function MMC — Head Pressure Control Function Contac
generated. If the alert condition still exists 30 minutes after unit enters Occupied mode, an alert will be generated at that time. UNIT OPERATION Unit Operation information can be accessed through the HSIO keypad and display (field-installed accessory). See the Keypad and Display Module section on page 9 for information on using the HSIO. The Status Function is provided to allow the user to access unit operation information. (Modes)— There are 21 different operating modes available.
Table 50 — Status Directory STATUS Subfunction 1 ALARMS Keypad Entry Display ALARMS Expansion (Press key) CURRENT ALARMS ALARM 51 COMPRESSOR A1 FAULT ALARM 53 COMPRESSOR A1 STATUS ALARM 55 COMPRESSOR B1 FAULT ALARM 57 COMPRESSOR B1 STATUS ALARM 59 THERMISTOR FAILURE SUPPLY AIR ALARM 60 THERMISTOR FAILURE RETURN AIR ALARM 61 OUTSIDE AIR THERMISTOR FAILURE ALARM 62 CIRCUIT A CONDENSER THERMISTOR FAILURE ALARM 63 CIRCUIT B CONDENSER THERMISTOR FAILURE ALARM 64 COMPRESSOR A1 THERMISTOR
Table 50 — Status Directory (cont) STATUS (cont) Subfunction 2 ALERTS 3 MODES Keypad Entry Display ALERTS Expansion (Press key) CURRENT ALERTS ALERT 150 SUPPLY AIR TEMP LOW LIMIT ALERT 151 SUPPLY AIR TEMP HIGH LIMIT ALERT 152 RETURN AIR TEMP LOW LIMIT ALERT 153 RETURN AIR TEMP HIGH LIMIT ALERT 154 OUTSIDE AIR TEMP LOW LIMIT ALERT 155 OUTSIDE AIR TEMP HIGH LIMIT ALERT 156 SPACE TEMP LOW LIMIT ALERT 157 SPACE TEMP HIGH LIMIT ALERT 158 STATIC PRESSURE LOW LIMIT ALERT 159 STATIC PRESSU
Table 50 — Status Directory (cont) STATUS (cont) Subfunction Keypad Entry 4 STAGES Display STAGES CURRENT STAGES COOL X COOLING STAGES X CPC X COOLING PERCENT CAPACITY X HEAT X HEATING STAGES X HPC X HEATING PERCENT CAPACITY X SMZ X SUM/Z RATIO X SETPOINT 5 SET POINT 6 TEMPERATURE CONTROL SETPOINT X CLTP X CONTROL TEMP X TEMPS SYSTEM TEMPERATURES STA X CIRCUIT A SATURATED SUCTION TEMP X SHA X CIRCUIT A SUCTION SUPERHEAT STB X SSTB X 7 PRESSURE * CIRCUIT A SATURATED CONDENSING T
Table 50 — Status Directory (cont) STATUS (cont) Subfunction Keypad Entry 8 INPUTS X X ENTER ENTER * * Display INPUTS SYSTEM INPUTS CSA1 X COMPRESSOR A1 STATUS X CSB1 X COMPRESSOR B1 STATUS X CFA1 X COMPRESSOR A1 SAFETY X CFB1 X COMPRESSOR B1 SAFETY X OAC X OUTSIDE AIR CFM X IAQ X INDOOR AIR QUALITY X X ENTER ENTER * * 9 ANALOG SFS X SUPPLY FAN STATUS X ENTHALPY SWITCH X ENT X ENTHALPY SWITCH X (0 = High, 1 = Low) RH X RELATIVE HUMIDTIY X RH X RELATIVE HUMIDITY X (0 to 100%
Table 50 — Status Directory (cont) STATUS (cont) Subfunction Keypad Entry 10 OUTPUTS Display Expansion (Press OUTPUTS X X ENTER ENTER * * DISCRETE OUTPUTS SF X SUPPLY FAN X SF X SUPPLY FAN X (0 = On, 1 = Off) EC2P X ECONOMIZER 2 POSITION X EC2P X ECONOMIZER 2 POSITION X (0 = Open, 1 = Closed) MM X MOTOR MASTER/FAN STAGE 1 X FR2 X OUTDOOR FAN 2 X FR3 X X X 11 STANDBY ENTER ENTER * * OUTDOOR FAN 3 X SF2S X 2 SPEED SUPPLY FAN X EFRF X EXHAUST/RETURN FAN X CPA1 X COMPRESSOR
(Outputs) — This subfunction displays the various system discrete outputs. These displays indicate the ability of the component or device to operate. It does not indicate that the component or device is functioning, but that the component or device has been energized by the control. Press to access additional discrete outputs. Some outputs can be user forced.
Table 51 — Compressor Loading and Unloading Sequences (60 Hz Units) (cont) COOLING STAGE 0 1 2 3 4 5 COOLING STAGE 0 1 2 3 4 5 COOLING STAGE 0 1 2 3 4 5 6 COOLING STAGE 0 1 2 3 4 5 6 Comp 1 OFF ON ON ON ON ON Comp 1 OFF ON ON ON ON ON Comp 1 OFF ON ON ON ON ON ON Comp 1 OFF ON ON ON ON ON ON Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF OFF Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF OFF Unloader U2
Table 52 — Compressor Loading and Unloading Sequences (50 Hz Units) COOLING STAGE 0 1 2 3 4 COOLING STAGE 0 1 2 3 4 5 COOLING STAGE 0 1 2 3 4 5 6 COOLING STAGE 0 1 2 3 4 5 6 SIZE 034 UNITS Lag Circuit Unloader Comp 2 U1A OFF OFF OFF OFF OFF OFF ON ON ON OFF Lead Circuit Unloader Comp 1 U1 OFF OFF ON ON ON OFF ON OFF ON OFF Comp 1 OFF ON ON ON ON ON Comp 1 OFF ON ON ON ON ON ON Comp 1 OFF ON ON ON ON ON ON Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF Lead Circuit Unloader U1 OFF ON ON OFF OFF OFF
TROUBLESHOOTING display reads STBY NO, press to place the unit in standby mode. If display reads STBY YES, the unit is already in the standby mode. To remove the unit from Standby ENTER mode, press . By using the accessory keypad and display module and the status function, actual operating conditions of the unit are displayed while it is running. Test function allows proper operation of compressors, compressor unloaders, fans, and other components to be checked while unit is stopped.
NOTE: To disable unit operation, press and put the unit in Standby mode. DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES (See Table 45): Alarm Codes 51 and 55 (Compressor Fault) — Alarm code 51 is for a fault on compressor A1, and alarm code 55 is for a fault on compressor B1.
Table 54 — Alarm Codes DISPLAY DESCRIPTION ACTION TAKEN BY CONTROL RESET METHOD Compressor A1 shut down Manual — — Compressor A1 shut down Manual — — Compressor B1 shut down Manual — — Automatic High-pressure switch open. Wiring error. — Voltage on DSIO1 J3 when compressor off. Failed contactor. Failed DSIO module. Circuit breaker tripped. — High-pressure switch open. Wiring error. — Voltage on DSIO1 J3 when compressor off. Failed contactor. Failed DSIO module. Circuit breaker tripped.
Table 54 — Alarm Codes (cont) DISPLAY DESCRIPTION ACTION TAKEN BY CONTROL RESET METHOD PROBABLE CAUSE Manual An overcharged system, high outdoor ambient temperature coupled with a dirty outdoor coil, plugged filter drier, partially closed liquid line service valve, or a faulty transducer. This alarm is only valid when the unit has refrigerant pressure transducers. Automatic Fan status switch failure, tubing not properly connected, or fan status switch set incorrectly.
outputs will turn on normally after the alarm condition has been reset. The probable cause for this condition is a faulty or improperly connected plug, a wiring error, or a faulty module. Alarm Code 72 (Loss of Communications With DSIO2) — If communication is lost with the DSIO2 module, all outputs controlled by this module will be turned off. This alarm will reset automatically once the communication is restored. The outputs will turn on normally after the alarm condition has been reset.
Alarm Code 89 through 92 (Pressurization, Evacuation, Smoke Purge, and Fire Shutdown, respectively) — When the unit is equipped with an optional smoke control and a fire system is installed, these 4 modes are provided to control smoke within areas serviced by the unit. The unit must be equipped with an economizer, power exhaust or return-air fan options, and the control option module to support these modes.
outside the range of 240 to 245 F (240 to 118.3 C) and 168,250 to 203.75 ohms (outdoor-air temperature, supplyair temperature, saturated condensing temperature, suction gas temperature, and return-air temperature only), it will be treated as a sensor failure and a diagnostic code will be displayed. It is also possible to check the operation of the thermistors using the test function. To check the thermistors: 1.
Table 56 — Thermistor Resistance vs Temperature Values for Space Temperature Thermistors T-55 and T-56 (10 K at 25 C Resistors) TEMP (F) 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 RESISTANCE (Ohms) 24051 23456 22877 22313 21766 21234 20716 20212 19722 19246 18782 18332 17893 17466 17050 16646 16253 15870 15497 15134 14780 14436 TEMP (F) 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 RESISTANCE (Ohms) 14101 13775 13457 13148 12846 12553 12267 11988 11717 11452 111
054 064 074 NOTE: Blank coils are included on size 054, 064 units only for relative position. Detail is provided for coils where thermistors are located. Fig.
After calibration, the results may be checked by following the steps outlined in Table 58. Pressure readings other than 0.0 psig indicate that the calibration was unsuccessful. Repeat the calibration procedure for any value that is greater than ± 1.0 psig. After satisfactory calibration of the transducers, reinstall them on the compressors. Transducer Troubleshooting — The unit control system may use transducers to measure pressures around the system. See Table 1 for pressure transducer locations and Fig.
Control Modules Turn controller power off before servicing controls. This ensures safety and prevents damage to controller. PROCESSOR MODULE (PSIO1), CONTROL OPTION MODULE (PSIO2), AND HIGH-VOLTAGE RELAY MODULES (DSIO1 and DSIO2) — The PSIO and DSIO modules all perform continuous diagnostic evaluations of the condition of the hardware. Proper operation of these modules is indicated by LEDs (light-emitting diodes) on the front surface of the DSIOs, and on the top horizontal surface of the PSIOs.
The COMM1 communications bus (Fig. 44) is for external communications to other equipment on the bus or to a computer running Building Supervisor or Service Tool software. A connection is usually made between the PSIO1 COMM1 plug on the rooftop unit, the air terminals, and the other rooftop units. A plug is provided in the control panel for connecting the external bus to the rooftop units. The external connection plug is factory wired to the PSIO1 COMM1 plug.
CONTROL OPTIONS MODULE (PSIO2) — See Fig. 47. The options module controls the following features: 1. Relative humidity sensor. This feature requires a fieldsupplied, 4-wire, 2 to 10 v RH (relative humidity) sensor. 2. Outdoor-air cfm sensor. This feature requires a 4-wire, field-supplied, mass flow sensor to input a 2 to 10 v signal. 3. Indoor-air quality. This feature uses a field-supplied, 4-wire, carbon-dioxide sensor to input a 2 to 10 v signal. 4. Fire and smoke routines.
3. Press ENTER to start the test. The supply fan will start and VFD will go from 0% speed (default position when unit starts) to 50% speed or IGVs will go from 0% open to 50% open. Quick Test — The test function provides a check on control inputs and outputs, and can only be conducted when the unit is in the standby mode. To put the unit into the ENTER . Disstandby mode, press , then , then play will read STBY YES.
Forcing Values — The control unit allows service person to input (or force) values into set points for troubleshooting. By forcing values in submaster reference loops or input channels, the service person can force the unit control to respond to different situations which may not occur normally at that time. In this way, operation of the unit and control can be tested. The input channels where forced values are permitted are identified in the directory tables.
Table 60 — History Directory HISTORY Subfunction 1 ALARM HISTORY Keypad Entry Display ALRMHIST 2 MAINTENANCE HISTORY Comment Alarm history ALARM X Latest alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion ALARM X Previous alarm expansion MTN/HIS Maintenance history mm.dd.
Table 61 — Service Directory Subfunction 1 LOG ON/OFF SERVICE Display Keypad Entry LOG ON ENTER LOGGEDON LOG OFF ENTER 2 SOFTWARE VERSION 3 FACTORY CONFIGURATION Software version number FACT CFG Factory configuration Unit type (0 = CV, 1 = VAV) SIZE X Unit size (034-074)† ULOP X Number of unloaders 2/3/4 HPSP X Head pressure set point (F) HEAT X Heat type (0 = None, 1 = Water/Steam, 2 = Elec, 3 = Gas) HTSG X Number of heat stages (0 to 5) TRNS X Transducer options (0 = No, 1 = Yes) SF
Table 61 — Service Directory (cont) Subfunction 6 USER CONFIGURATION (cont) Keypad Entry 7 HEATING COIL X ENTER * SERVICE (cont) Display OSEN X Description Adaptive optimal start/stop (0 = Disable, 1 = Enable) DLEN X Demand limit (0 = Disable, 1 = Enable) OHEN X Occupied heating (0 = Disable, 1 = Enable) RSEN X Space temperature reset (0 = Disable, 1 = Enable) DPEN X Duct pressure control (0 = Disable, 1 = Enable) FANM X Fan mode auto/cont (0 = Auto, 1 = Cont) TSCH X Timed override schedu
Table 61 — Service Directory (cont) Subfunction 13 AOSS Keypad Entry SERVICE (cont) Display AOSS Description Configure adaptive optimal start/stop BLDF X Building factor value (1 to 100; default = 10) UOCF X 24-hour unoccupied factor (0 to 99; default = 15) SETB X Set point bias (0 to 10; default = 2) OSMT X Maximum allowable stop time (10 to 120; default = 60) SPCRESET 14 SPACE TEMPERATURE RESET RTIO X Reset ratio (0 to 10; default = 3) LIMT X Reset limit (0 to 20; default = 10) LOADSHED
Table 61 — Service Directory (cont) Subfunction 18 BUILDING PRESSURE Keypad Entry X ENTER * SERVICE (cont) Display BLD PRES MLG X Master loop gain value SMG X Submater gain value SCV X Submaster center value SMR X Submaster reference value SMR X Submaster reference value forced (0.0 to 0.5) BPS X Building pressure set point (0 to 0.50; default = 0.05) BPSO X 19 ALERT LIMITS Building pressure set point offset (0.05 to 0.50; default = 0.
Table 62 — Factory/Field Configuration Procedure KEYPAD ENTRY DISPLAY ENTER ENTER ENTER ENTER COMMENTS LOG ON LOGGEDON Must enter password FACT CFG Factory configuration TYPE 1 Unit type — Enter correct value TYPE X CV = 0, VAV = 1 SIZE 24 Unit size — Enter correct value: SIZE X 034,044,054,064, or 074† ULOP 2 Number of Unloaders — Enter value: ULOP X 2, 3, or 4 HPSP 113 ENTER ENTER * Head pressure set point; Default=113 F HEAT 0 Heat type — Enter correct value: HEAT X 0=None,
Table 62 — Factory/Field Configuration Procedure (cont) KEYPAD ENTRY DISPLAY COMMENTS USER CFG ENTER ENTER ENTER User configuration HUSN 0 Humidity sensors; Default = No (0 = No, 1 = Differential [2 sensors], 2 = Space Override [1 sensor]) SUSN 0 Suction sensors (Enter value) SUSN X 0 = No, 1 = Yes VENT 0 Ventilation control (Enter value) VENT X 0 = SPT, 1 = IAQ, 2 = CFM, 3 = All MMAS 0 Head pressure control function (Enter value) MMAS X 0 = No, 1 = Yes IAQ purge enable; Default = Disab
Table 63 — Test Directory TEST Subfunction 1 INPUTS Keypad Entry Display Expansion (Press key) INPUTS FACTORY/FIELD TEST OF INPUTS CSA1 X COMPRESSOR A1 STATUS X CSB1 X COMPRESSOR B1 STATUS X CFA1 X COMPRESSOR A1 SAFETY X CFB1 X COMPRESSOR B1 SAFETY X IAQ X INIDOOR AIR QUALITY X OAC X OUTSIDE AIR CFM X SFS X SUPPLY FAN STATUS X ENT X ENTHALPY SWITCH X RH X RELATIVE HUMIDITY X FRZ X FREEZE STAT X OARH X OUTSIDE AIR RELATIVE HUMIDITY X FLTS X FILTER STATUS X EVAC X EVACUATION X
Table 63 — Test Directory (cont) TEST (cont) Subfunction Keypad Entry 2 ANALOG OUTPUTS * Display ANLGOUT IGV ENTER IGV TST ECON ENTER ECON TST HCV ENTER HCV TST PERD ENTER PERD TST HUM ENTER 3 DISCRETE OUTPUTS SF TEST EC2P TEST MM TEST FR2 TEST FR3 ENTER FR3 TEST SF2S ENTER SF2S TST EFRF ENTER EFRF TST ULA1 ENTER ULA1 TST ULB1 ENTER ULB1 TST ULA2 ENTER ULA2 TST ULB2 ENTER ULB2 TST HUM1 ENTER HUM1 TST DTCC ENTER DTCC TST PERD ENTER TESTING INLET GUIDE VANES ECONOMIZER TE
Table 63 — Test Directory (cont) TEST (cont) Subfunction Keypad Entry 4 COMPRESSOR TESTS Display COMPRSR CPA1† ENTER CPA1 TST CPB1 ENTER 5 HEAT STAGES ENTER CPB1 TST 6 EXIT TEST ENTER TESTING COMPRESSOR A1** COMPRESSOR B1 TESTING COMPRESSOR B1** STAGE 1 TEST STG1 TST STG2 TST STG3 TST STG4 TST HS5 ENTER COMPRESSOR A1 TEST FACTORY/FIELD TEST OF HEAT HS4 ENTER FACTORY/FIELD TEST OF COMPRESSOR HS1† HS3 ENTER key) HEAT HS2 ENTER Expansion (Press TESTING HEAT STAGE 1 STAGE 2 TEST TESTI
APPENDIX Input/Output Tables, Channels 1-30 (PSIO1, DSIO1) PSIO1 Channel No. Inputs 1 2 3† 4† 5† 6† 7 8 9 10 11 12 Outputs 13 14 15 16 17 18 DSIO1 Channel No.
APPENDIX (cont) Input/Output Tables, Channels 31-60 (PSIO2, DSIO2) PSIO2 Channel No. Inputs 31 32 33 34 35 36 37 38 39 40 41 42 Outputs 43 44 45 46 47 48 DSIO2 Channel No.
