Carrier WEATHERMAKER 48/50AJ Operation And Service Manual
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Carrier WEATHERMAKER 48/50AJ Operation And Service Manual

Carrier WEATHERMAKER 48/50AJ Operation And Service Manual

Single package large rooftop units with comfortlink version 5.x controls
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Controls, Start-Up, Operation,
Service and Troubleshooting
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Conventions Used in this Manual. . . . . . . . . . . . . . . . . . . .3
BASIC CONTROL USAGE. . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Scrolling Marquee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Accessory Navigator™ Display. . . . . . . . . . . . . . . . . . . . . .4
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Pilot™ Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
CCN Tables and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Unit Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Accessory Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
CONTROLS QUICK START . . . . . . . . . . . . . . . . . . . . . . 27-29
Mechanical Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . .27
Two-Stage Constant Volume Units with
Space Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
or Space Temperature Sensor . . . . . . . . . . . . . . . . . . . .28
Mechanical Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . .28
Multi-Stage Constant Volume Units with
Space Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Economizer Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Indoor Air Quality Options. . . . . . . . . . . . . . . . . . . . . . . . . .29
Exhaust Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Programming Operating Schedules . . . . . . . . . . . . . . . .29
SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29,30
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Independent Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Fans in Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . .30
Cooling in Service Test Mode. . . . . . . . . . . . . . . . . . . . . . .30
Heating in Service Test Mode. . . . . . . . . . . . . . . . . . . . . . .30
THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . 31,32
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
VFD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Demand Controlled Ventilation Control . . . . . . . . . . . . .31
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 32-75
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480077-01
48/50AJ,AK,AW,AY,A2,A3,A4,A5020-060
with COMFORTLINK™ Version 5.x Controls
CONTENTS
Page
Printed in U.S.A.
Form 48/50A-9T
Single Package Large Rooftop Units
Unit Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . 35
Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
• DEMAND LIMIT CONTROL
Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
• HEAT MODE SELECTION PROCESS
• RELOCATE SAT SENSOR FOR HEATING IN
LINKAGE SYSTEMS
Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• OPERATION
Fan Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
• GENERAL
Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
• UNOCCUPIED ECONOMIZER FREE COOLING
Building Pressure Control. . . . . . . . . . . . . . . . . . . . . . . . . . 63
OPERATION
CONTROL
Smoke Control Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Pg 1
WEATHERMAKER
6-10
Replaces: 48/50A-7T
®
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Summary of Contents for Carrier WEATHERMAKER 48/50AJ

  • Page 1: Table Of Contents

    Controls, Start-Up, Operation, Service and Troubleshooting SAFETY CONSIDERATIONS ......2 GENERAL ......... . .3 Conventions Used in this Manual.

  • Page 2: Safety Considerations

    (CCN) System... 71 ® Carrier Comfort Network Alert Limit Configuration......72 Sensor Trim Configuration .

  • Page 3: General

    Access to the unit controls for configuration, set point selection, schedule creation, and service can be done through a unit-mounted scrolling marquee. Access can also be done through the Carrier Comfort Network ® (CCN) system using the ComfortVIEW™ software, the accessory Navigator™ hand- held display, or the System Pilot™...

  • Page 4: Scrolling Marquee

    Unit-mounted actua- tors provide digital feedback data to the unit control. The ComfortLink control system is fully communicating and cable-ready for connection to the Carrier Comfort Net- work (CCN) building management system. The control pro- ®...

  • Page 5: System Pilot™ Interface

    Mode categories may not apply. System Pilot™ Interface — (33PILOT-01) device is a component of Carrier’s 3V™ system and serves as a user-interface and configuration tool for all Car- rier communicating devices. The System Pilot device can be...
  • Page 6 Table 2 — Scrolling Marquee Menu Display Structure SERVICE TEMPERATURES STATUS TEST Auto View of Service Test Mode Run Status (TEST) Temperatures  (VIEW) (AIR.T)   Software Econ Command Refrigerant Run Status Disable Temperatures (ECON) (STOP) (REF.T)   Cooling Soft Stop Information...

  • Page 7: Start-Up

    START-UP IMPORTANT: Do not attempt to start unit, even momentarily, until all items on the Start-Up Checklist and the following steps have been completed. Check that unit has been installed in Unit Preparation — accordance with the installation instructions and applicable codes.
  • Page 8 Table 3 — Fan Performance — 48AJ,AK020,025 and 48A2,A3020 Units AIRFLOW (CFM) 4,000 0.62 0.84 5,000 0.97 1.19 6,000 1.43 1.65 7,000 2.01 2.25 7,500 2.36 2.60 8,000 2.74 2.98 9,000 3.61 3.87 10,000 4.64 4.91 11,000 5.84 6.11 12,000 7.20 7.49 12,500...
  • Page 9 Table 5 — Fan Performance — 48AJ,AK,A2,A3035 Units AIRFLOW (Cfm) 7,000 2.46 2.80 8,000 3.27 3.63 9,000 4.23 4.62 10,000 5.35 5.77 10,500 5.97 6.40 11,000 6.63 7.08 12,000 8.09 8.56 13,000 9.72 10.22 14,000 11.54 12.07 15,000 13.56 1024 14.11 1051 16,000...
  • Page 10 Table 7 — Fan Performance — 48AJ,AK,A2,A3040 Units AIRFLOW (Cfm) 8,000 2.90 3.30 9,000 3.81 4.24 10,000 4.89 5.34 11,000 6.15 6.62 12,000 7.60 8.09 13,000 9.24 9.76 14,000 11.10 11.64 15,000 13.18 13.74 16,000 15.49 16.06 17,000 18.03 18.62 1015 18,000 1020...
  • Page 11 Table 9 — Fan Performance — 48AJ,AK,A2,A3050 Units AIRFLOW (Cfm) 8,000 2.98 3.38 9,000 3.90 4.33 10,000 5.00 5.45 11,000 6.27 6.75 12,000 7.74 8.24 13,000 9.41 9.93 14,000 11.29 11.84 15,000 13.40 13.96 16,000 15.74 16.32 17,000 18.32 1003 18.92 1027 18,000...
  • Page 12 Table 11 — Fan Performance — 48AJ,AK,A2,A3060 Units AIRFLOW (Cfm) 12,000 4.33 5.04 14,000 6.19 6.96 15,000 7.28 8.09 16,000 8.48 9.34 689 10.17 17,000 9.80 10.71 717 11.58 18,000 11.25 12.21 745 13.11 19,000 12.82 13.84 773 14.77 20,000 14.53 15.60 802 16.57...
  • Page 13 Table 13 — Fan Performance — 50AJ,AK027,030 and 50A2,A3025-030 Units AIRFLOW (CFM) 4,000 0.54 0.72 5,000 0.85 1.03 6,000 1.26 1.45 7,000 1.79 1.98 8,000 2.44 2.64 9,000 3.23 3.43 10,000 4.15 4.36 11,000 5.22 5.44 12,000 6.45 6.67 13,000 7.85 8.07 14,000...
  • Page 14 Table 15 — Fan Performance — 50AJ,AK036 Units AIRFLOW (Cfm) 7,000 1.99 8,000 2.69 9,000 3.53 10,000 4.52 11,000 5.68 12,000 7.01 13,000 8.53 14,000 10.24 15,000 12.15 16,000 14.27 17,000 16.61 17,500 17.87 AIRFLOW (Cfm) 7,000 3.85 8,000 4.66 9,000 5.63 10,000...
  • Page 15 Table 17 — Fan Performance — 50AJ,AK041 Units AIRFLOW (Cfm) 8,000 2.69 9,000 3.53 10,000 4.52 11,000 5.68 12,000 7.01 13,000 8.53 14,000 10.24 15,000 12.15 16,000 14.27 17,000 16.61 18,000 19.18 19,000 1007 21.98 1030 20,000 1057 25.02 1079 AIRFLOW (Cfm) 8,000...
  • Page 16 Table 19 — Fan Performance — 50AJ,AK051 Units AIRFLOW (Cfm) 10,000 2.69 12,000 4.03 13,000 4.83 14,000 5.74 15,000 6.75 16,000 7.88 17,000 9.12 18,000 10.48 19,000 11.96 20,000 13.57 21,000 15.30 22,000 17.18 23,000 19.20 24,000 21.35 25,000 23.66 AIRFLOW (Cfm) 10,000...
  • Page 17 Table 21 — Fan Performance — 48AW,AY020,025 and 48A4,A5020 Units AIRFLOW (CFM) 4,000 0.71 0.97 5,000 1.10 1.37 6,000 1.61 1.89 7,000 2.27 2.56 7,500 2.66 2.95 8,000 3.09 3.38 9,000 4.07 4.37 10,000 5.23 5.54 11,000 6.58 6.89 12,000 8.12 8.45 12,500...
  • Page 18 Table 23 — Fan Performance — 48AW,AY,A4,A5035 Units AIRFLOW (Cfm) 7,000 2.59 2.92 8,000 3.45 3.81 9,000 4.47 4.86 10,000 5.67 6.08 10,500 6.33 6.75 11,000 7.04 7.47 12,000 8.60 9.06 13,000 10.36 10.84 14,000 12.32 1008 12.82 1035 15,000 1042 14.49 1069...
  • Page 19 Table 25 — Fan Performance — 48AW,AY,A4,A5040 Units AIRFLOW (Cfm) 8,000 3.10 3.50 9,000 4.08 4.51 10,000 5.24 5.70 11,000 6.59 7.07 12,000 8.15 8.65 13,000 9.92 10.45 14,000 11.92 12.47 15,000 14.15 14.72 16,000 16.63 17.23 1014 17,000 1021 19.37 1044 19.98...
  • Page 20 Table 27 — Fan Performance — 48AW,AY,A4,A5050 Units AIRFLOW (Cfm) 8,000 3.18 3.58 9,000 4.17 4.60 10,000 5.35 5.80 11,000 6.72 7.20 12,000 8.29 8.80 13,000 10.09 10.62 14,000 12.12 12.67 15,000 14.38 14.96 16,000 16.90 1000 17.49 1025 17,000 1032 19.67 1056...
  • Page 21 Table 29 — Fan Performance — 48AW,AY,A4,A5060 Units AIRFLOW (Cfm) 12,000 4.81 5.54 14,000 6.90 7.69 15,000 8.13 8.96 16,000 9.49 697 10.36 737 11.22 17,000 689 10.99 730 11.90 769 12.79 18,000 725 12.64 764 13.58 801 14.51 19,000 760 14.43 798 15.41 834 16.37...
  • Page 22 Table 31 — Fan Performance — 50AW,AY027,030 and 50A4,A5025-030 Units AIRFLOW (CFM) 4,000 0.62 0.83 5,000 0.97 1.19 6,000 1.43 1.66 7,000 2.02 2.25 8,000 2.76 2.99 9,000 3.64 3.88 10,000 4.68 4.92 11,000 5.89 6.14 12,000 7.28 7.53 13,000 8.85 9.11 14,000...
  • Page 23 Table 33 — Fan Performance — 50AW,AY036 Units AIRFLOW (Cfm) 7,000 2.13 8,000 2.88 9,000 3.78 10,000 4.86 11,000 6.11 12,000 7.54 13,000 9.18 14,000 11.03 15,000 13.09 16,000 15.38 17,000 17.91 17,500 19.26 AIRFLOW (Cfm) 7,000 3.99 8,000 4.87 9,000 5.90 10,000...
  • Page 24 Table 35 — Fan Performance — 50AW,AY041 Units AIRFLOW (Cfm) 8,000 2.88 9,000 3.78 10,000 4.86 11,000 6.11 12,000 7.54 13,000 9.18 14,000 11.03 15,000 13.09 16,000 15.38 17,000 17.91 18,000 1016 20.68 19,000 1069 23.71 20,000 1122 26.99 AIRFLOW (Cfm) 8,000 4.87...
  • Page 25 Table 37 — Fan Performance — 50AW,AY051 Units AIRFLOW (Cfm) 10,000 2.98 12,000 4.48 13,000 5.39 14,000 6.41 15,000 7.56 16,000 8.83 17,000 10.23 18,000 11.76 19,000 13.44 20,000 15.26 21,000 17.23 22,000 19.35 23,000 21.63 24,000 24.07 25,000 26.67 AIRFLOW (Cfm) 10,000...
  • Page 26 — Brake Horsepower — Brake Kilowatts NOTES: 1. Extensive motor and electrical testing on the Carrier units has ensured that the full horsepower range of the motor can be utilized with confidence. Table 40A — Air Quantity Limits (48AJ,AK,AW,AY,A2,A3,A4,A5) MINIMUM HEATING...

  • Page 27: Controls Quick Start

    Table 40B — Air Quantity Limits (50AJ,AK,AW,AY,A2,A3,A4,A5) UNIT 50AJ,AW,A2,A3020 50AK,AY,A4,A5020 50AJ,AW,A2,A3025 50AK,AY,A4,A5025 50AJ,AW,A2,A4027 50AK,AY,A3,A5027 50AJ,AW,A2,A4030 50AK,AY,A3,A5030 50AJ,AW,A2,A4035 50AJ,AW036 50AK,AY,A3,A5035 50AK,AY036 50AJ,AW,A2,A4040 50AJ,AW041 50AK,AY,A3,A5040 50AK,AY041 50AJ,AW,A2,A4050 50AK,AY,A3,A5050 50AJ,AW051 50AJ,AW,A2,A4060 50AK,AY051 50AK,AY,A3,A5060 *Operation at these levels may be limited by entering evaporator air wet bulb temperatures. CONTROLS QUICK START The following section will provide a quick user guide to set- ting up and configuring the A Series units with ComfortLink™...

  • Page 28: Space Sensor

    Variable Air Volume Units Using Return Air Sensor or Space Temperature Sensor — figure the unit, perform the following: 1. The type of control is configured under Configuration   UNIT C.TYP. Set C.TYP to 1 (VAV-RAT) for return air sensor. Set C.TYP to 2 (VAV-SPT) for space tempera- ture sensor.

  • Page 29: Indoor Air Quality Options

    Indoor Air Quality (IAQ) Options DEMAND CONTROLLED VENTILATION — Under   Configuration DCV.C, the following configuration parameters should be set to establish the minimum and maxi- mum points for outdoor air damper position during demand controlled ventilation (DCV): EC.MN Economizer Min.Position IAQ.M IAQ Demand Vent Min.Pos.

  • Page 30: Independent Outputs

    However, it is important to note that the user can leave a Service Test mode to view any of the local display modes and the control will remain in the Service Test mode. The INDP sub-mode items Independent Outputs — can be turned on and off regardless of the other category states.

  • Page 31: Third Party Control

    THIRD PARTY CONTROL The method of control would be through Thermostat — the thermostat inputs: Y1 = first stage cooling Y1 and Y2 = first and second stage cooling W1 = first stage heating W1 and W2 = first and second stage heating G = supply fan The alarm output TB4-7 and 8, will pro- Alarm Output —...

  • Page 32: Controls Operation

    IQ.I.C = 2 (IAQ Discrete Override) — If the user sets IQ.I.C to 2 (IAQ Discrete Override), and Configuration IAQ.L is set to OPEN, then an open switch reads low and a closed switch reads high. If the switch reads low, no action will be taken. If the switch reads high, the economizer will immediately be commanded to the IAQ Economizer Override Position.

  • Page 33: System Modes

    Table 42 — Operating Modes Display Table ITEM EXPANSION SYS.M ascii string HVAC ascii string CTRL ascii string MODE MODES CONTROLLING UNIT Currently Occupied ON/OFF MODEOCCP T.OVR Timed Override in Effect ON/OFF MODETOVR DCV Resetting Min Pos ON/OFF MODEADCV SA.R Supply Air Reset ON/OFF MODESARS DMD.L Demand Limit in Effect...
  • Page 34 System Mode = OFF? System Mode Inputs -> FIRE -> HVAC Mode = OFF FSD in alarm? (Disabled) HVAC Mode = OFF (Fire Shutdown) Exceptions Config->UNIT-> C.TYP changed while unit running? 15-second delay HVAC Mode = OFF (Disabled) Config->SP-> SP.CF = 1 OR 2 and static pressure sensor has failed...

  • Page 35: Unit Configuration Submenu

    HVAC Mode — TEMPERING HICOOL (12) — The econ- omizer is at minimum vent position but the combination of the outside-air temperature and the economizer position has dropped the supply-air temperature below the tempering cool set point. Staged gas heat is used to temper the ventilation air. HVAC Mode —...
  • Page 36 Compensated Start section for more information. A setting of 0 minutes indicates Temperature Compensated Start in Cooling is not permitted. Temperature Compensated Start Heating Factor (TCS.H) — This factor is used in the equation of the Temperature Compen- sated Start Time Bias for heating. Refer to the Temperature Compensated Start section for more information.

  • Page 37: Cooling Control

    Reset MAT Table Entries? (MAT.R) — This configuration allows the user to reset the internally stored MAT learned con- figuration data back to the default values. The defaults are set to a linear relationship between the economizer damper posi- tion and OAT and RAT in the calculation of MAT. MAT Outside Air Position Default (MAT.D) —...

  • Page 38: Machine Dependent Configurations

    out a LOW COOL or a HIGH COOL mode and maintain a low or high cool supply air set point. • C.TYP = 6 (SPT-2 STG) This configuration will force the control to monitor the space temperature sensor to make a determination of mode and allow two stages of cooling.

  • Page 39: Cooling Configuration

    ITEM EXPANSION COOL COOLING CONFIGURATION Z.GN Capacity Threshold Adjst MC.LO Compressor Lockout Temp C.FOD Fan-Off Delay, Mech Cool Min. Load Valve (HGBP)? M.M. Motor Master Control ? HPSP Head Pressure Setpoint A1.EN Enable Compressor A1 A2.EN Enable Compressor A2 B1.EN Enable Compressor B1 B2.EN Enable Compressor B2...

  • Page 40: Compressor Time Guards

    temperature (OAT) rises above 75 F or the highest active cir- cuit saturated condensing temperature (SCT) rises above the HPSP and remains on until the condition is repaired regardless of the OAT and SCT values. Any time the alert occurs, a strike is called out on the affect- ed compressor.
  • Page 41 The advantage of this offset technique is that the control can safely enforce a vent mode without worrying about crossing set points. Even more importantly, under CCN linkage, the occupied heating set point may drift up and down and this method ensures a guaranteed separation in degrees Fahrenheit between the calling out of a heating or cooling mode at all times.
  • Page 42 Table 48 — Cool/Heat Set Point Offsets Configuration ITEM EXPANSION D.LV.T COOL/HEAT SETPT. OFFSETS L.H.ON Dmd Level Lo Heat On H.H.ON Dmd Level(+) Hi Heat On L.H.OF Dmd Level(-) Lo Heat Off L.C.ON Dmd Level Lo Cool On H.C.ON Dmd Level(+) Hi Cool On L.C.OF Dmd Level(-) Lo Cool Off C.T.LV...
  • Page 43 then Lo Cool Mode mechanical stages = 2 and Hi Cool Mode mechanical stages = 2. 5. If the economizer position is greater than Configuration   ECON EC.MX – 5% for more than 8 minutes but less than 11.5 minutes and mechanical cooling has started then: Lo Cool Mode mechanical stages = 2 Hi Cool Mode mechanical stages = 3...
  • Page 44 Table 52 — Staging Sequence with Hot Gas Bypass — 48/50AK,AY020-027 and Multi-Stage 48/50AJ,AW020-027 SEQUENCE 1 STAGE COMP Compressor Status UNIT Unit Capacity 48/50A *With Minimum Load Valve ON. Table 53 — Staging Sequence without Hot Gas Bypass — 48/50AK,AY030-060 and Multi-Stage 48/50AJ,AW030-060 SEQUENCE 1 STAGE COMP...
  • Page 45 Table 57 — Staging Sequence without Hot Gas Bypass — 48/50A3,A5020-027 and Multi-Stage 48/50A2,A4020-027 STAGE COMP Compressor Status UNIT Unit Capacity 48/50A Table 58 — Staging Sequence with Hot Gas Bypass — 48/50A3,A5020-027 and Multi-Stage 48/50A2,A4020-027 SEQUENCE 1 STAGE COMP Compressor Status UNIT Unit Capacity 48/50A...

  • Page 46: Cooling Mode Diagnostic Help

    COOLING MODE DIAGNOSTIC HELP — To quickly de- termine the current trip points for the cooling modes, the Run Status sub-menu at the local display allows the user to view the calculated start and stop points for both the cooling and heating trip points.
  • Page 47 ITEM EXPANSION COOL COOLING INFORMATION C.CAP Current Running Capacity CUR.S Current Cool Stage REQ.S Requested Cool Stage MAX.S Maximum Cool Stages DEM.L Active Demand Limit SUMZ COOL CAP. STAGE CONTROL Capacity Load Factor ADD.R Next Stage EDT Decrease SUB.R Next Stage EDT Increase R.PCT Rise Per Percent Capacity Y.MIN...
  • Page 48 MAT Calc Config (MAT.S) — This configuration gives the user two options in the processing of the mixed-air temperature (MAT) calculation: • MAT.S = 0 There will be no MAT calculation. • MAT.S = 1 The control will attempt to learn MAT over time. Any time the system is in a vent mode and the economizer stays at a particular position for long enough, MAT = EDT.

  • Page 49: Head Pressure Control

    ITEM EXPANSION DMD.L DEMAND LIMIT CONFIG. DM.L.S Demand Limit Select D.L.20 Demand Limit at 20 ma SH.NM Loadshed Group Number SH.DL Loadshed Demand Delta SH.TM Maximum Loadshed Time D.L.S1 Demand Limit Sw.1 Setpt. D.L.S2 Demand Limit Sw.2 Setpt. The relevant configurations for this type of demand limiting are: Loadshed Group Number (SH.NM) —...

  • Page 50: Economizer Integration With Mechanical Cooling

    FAN RELAY OFC1,4* (MBB - RELAY 6) OFC2 (MBB - RELAY 5) OFC3 C.A1-AUX or C.A2-AUX OFC1* C.B1-AUX or C.B2-AUX * For size 60 ton units with MCHX condensers, MBB – Relay 6 drives OFC4 and compressor contactor B1 or B2 auxiliary contacts drive OFC1. For 060 size units with MCHX condensers, there are four outdoor fans, two for each independent refrigerant circuit.
  • Page 51 ITEM EXPANSION HEAT HEATING CONFIGURATION HT.CF Heating Control Type HT.SP Heating Supply Air Setpt OC.EN Occupied Heating Enabled LAT.M MBB Sensor Heat Relocate G.FOD Fan Off Delay, Gas Heat E.FOD Fan Off Delay, Elec Heat SG.CF STAGED GAS CONFIGS HT.ST Staged Gas Heat Type CAP.M Max Cap Change per Cycle...

  • Page 52: Temperature Driven Heat Mode Evaluation

    TEMPERATURE DRIVEN HEAT MODE EVALUATION — This section discusses the control method for selecting a heat- ing mode based on temperature. Regardless of whether the unit is configured for return air or space temperature, the logic is ex- actly the same. For the rest of this discussion, the temperature in question will be referred to as the “controlling temperature.”...
  • Page 53 Staged Gas Capacity Calculation = “P + D” + old Staged Gas Capacity Calculation NOTE: The PID values should not be modified without approval from Carrier. IMPORTANT: When gas or electric heat is used in a VAV application with third party terminals, the HIR relay output must be connected to the VAV terminals in the system in order to enforce a minimum heating airflow rate.

  • Page 54: Integrated Gas Control Board Logic

    ITEM EXPANSION SG.CF STAGED GAS CONFIGS HT.ST Staged Gas Heat Type CAP.M Max Cap Change per Cycle M.R.DB S.Gas DB min.dF/PID Rate S.G.DB St.Gas Temp. Dead Band RISE Heat Rise dF/sec Clamp LAT.L LAT Limit Config LIM.M Limit Switch Monitoring? SW.H.T Limit Switch High Temp SW.L.T...
  • Page 55 Table 69B — Staged Gas Heat — 48A2,A3,A4,A5 Units UNIT SIZE HEAT CAPACITY 020-030 High 035-050 High High Table 70 — Staged Gas Heat Control Steps (Configuration Heat 1 Heat 2 STAGE MBB-RLY8 MBB-RLY7 IGC1 MGV1 Table 71 — Staged Gas Heat Control Steps (Configuration Heat 1 Heat 2 STAGE...

  • Page 56: Morning Warm Up

    Installing a New Sensor — A field-provided duct-mount tem- perature sensor (Carrier P/N 33ZCSENPAT or equivalent 10 kilo-ohm at 25 C NTC [negative temperature coefficient] sensor) is required. Install the sensor through the side wall of the duct and secure.

  • Page 57: Static Pressure Control

    HVAC mode = “Tempering LoCool” HVAC mode = “Tempering HiCool” The decision making/selection process for the tempering trip set point is as follows: • If an HVAC cool mode is in effect, then the vent trip point is T.CL. • If in a pre-occupied purge mode (Operating Modes ...
  • Page 58 Static Pressure Set Point (SP.SP) — This is the static pres- sure control point. It is the point against which the ComfortLink controls compare the actual measured supply duct pressure for determination of the error that is used for PID control.

  • Page 59: Static Pressure Reset Operation

    Note the existing settings before making changes, and seek technical assistance from Carrier before making significant changes to these factors.  Static Pressure PID Run Rate (S.PID number of seconds between duct static pressure readings taken by the ComfortLink™...

  • Page 60: Supply Fan Status Monitoring Logic

    Table 76 — Static Pressure Reset Related Points ITEM EXPANSION Inputs  4-20  SP.M Static Pressure mA  4-20  SP.M.T Static Pressure mA Trim  4-20 SP.R.M Static Pressure Reset mA  RSET SP.RS Static Pressure Reset Outputs ...

  • Page 61: Economizer Operation

    modulate to the same control point (Sum Z) that is used to control capacity staging. The advantage is lower compressor cycling coupled with tighter temperature control. Setting this option to No will cause the economizer, if it is able to provide free cooling, to open to the Economizer Max.
  • Page 62 ITEM EXPANSION EC.EN Economizer Installed? EC.MN Economizer Min.Position EC.MX Economizer Max.Position E.TRM Economzr Trim For SumZ ? E.SEL Econ ChangeOver Select OA.E.C OA Enthalpy ChgOvr Selct OA.EN Outdr.Enth Compare Value OAT.L High OAT Lockout Temp O.DEW OA Dewpoint Temp Limit ORH.S Outside Air RH Sensor E.TYP...

  • Page 63: Economizer Operation Configuration

    Unoccupied Economizer Free Cooling Outside Lockout Temperature (FC.LO) — This configuration option allows the user to select an outside-air temperature below which unoc- cupied free cooling is not allowed. This is further explained in the logic section. Unoccupied Economizer Free Cooling Logic — The follow- ing qualifications that must be true for unoccupied free cooling to operate: •...
  • Page 64 ITEM EXPANSION ECN.P Economizer Act.Curr.Pos. ECN.C Economizer Act.Cmd.Pos. ACTV Economizer Active ? DISA ECON DISABLING CONDITIONS UNAV Econ Act. Unavailable? R.EC.D Remote Econ. Disabled? DBC - OAT Lockout? DEW - OA Dewpt.Lockout? DDBC DDBD- OAT > RAT Lockout? OAEC OAEC- OA Enth Lockout? DEC - Diff.Enth.Lockout? EDT Sensor Bad? OAT Sensor Bad ?

  • Page 65: Building Pressure Configuration

    CONSTANT VOLUME 2-STAGE CONTROL (BP.CF = 1) OPERATION — Two exhaust fan relays will be turned on and off based on economizer position. The two trip set points are BP.P1 and BP.P2. If the economizer is greater than or equal to BP.P1, then power exhaust stage 1 is requested and a 60-second timer is initialized.

  • Page 66: Vfd Power Exhaust Building Pressure

    Table 83 — Power Exhaust Staging (BP.CF = 2) BP.MT = 1 (4 motors) Power Exhaust Stage 0 Power Exhaust Stage 1 Power Exhaust Stage 2 Power Exhaust Stage 3 Power Exhaust Stage 4 BP.MT = 2 (6 motors) Power Exhaust Stage 0 Power Exhaust Stage 1 Power Exhaust Stage 2 Power Exhaust Stage 3...

  • Page 67: Relevant Items

    RELEVANT ITEMS The economizer’s commanded output can be found in   Outputs ECON ECN.C. The configurable fire speed override for supply fan VFD is in   Configuration SP.FS. The supply fan relay’s commanded output can be found in ...
  • Page 68 ECONOMIZER MINIMUM DAMPER POSITION VENTILATION FOR PEOPLE MINIMUM DAMPER POSITION VENTILATION FOR SOURCES 1000 DIFFERENTIAL DIFFERENTIAL LOW (DAQ.L) HIGH (DAQ.H) Fig. 12 — IAQ Control NOTE: Calculating the IAQ.M and EC.MN damper position based on differential IAQ measurement. Based on the configuration parameter IAQREACT, the reaction to damper positioning based on differential air quality ppm can be adjusted.

  • Page 69: Dehumidification And Reheat

    OAQ reading. IAQ Low Reference (Configuration IQ.R.L) — This is the reference that will be used with a non-Carrier IAQ sensor that may have a different characteristic curve. It represents the CO level at 4 mA. IAQ High Reference (Configuration ...
  • Page 70 ITEM EXPANSION DCV.C DCV ECONOMIZER SETPOINTS EC.MN Economizer Min.Position IAQ.M IAQ Demand Vent Min.Pos. AQ.CF AIR QUALITY CONFIGS IQ.A.C IAQ Analog Sensor Config IQ.A.F IAQ 4-20 ma Fan Config IQ.I.C IAQ Discrete Input Config IQ.I.F IAQ Disc.In. Fan Config OQ.A.C OAQ 4-20ma Sensor Config AQ.SP AIR QUALITY SETPOINTS...

  • Page 71: Temperature Compensated Start

    Carrier Comfort Network is possible to configure the ComfortLink™ control to partici- pate as an element of the Carrier Comfort Network (CCN) sys- tem directly from the local display. This section will deal with explaining the various programmable options which are found under the CCN sub-menu in the Configuration mode.

  • Page 72: Alert Limit Configuration

    ITEM EXPANSION CCN CONFIGURATION CCNA CCN Address CCNB CCN Bus Number BAUD CCN Baud Rate BROD CCN BROADCST DEFINITIONS TM.DT CCN Time/Date Broadcast OAT.B CCN OAT Broadcast ORH.B CCN OARH Broadcast OAQ.B CCN OAQ Broadcast G.S.B Global Schedule Broadcst B.ACK CCN Broadcast Ack'er SC.OV CCN SCHEDULES-OVERRIDES...

  • Page 73: Sensor Trim Configuration

    then Alert 309 will occur. The unit will continue to run and the alert will automatically reset. Supply Duct Pressure Low Alert Limit (SP.L) — If the unit is a VAV unit with a supply duct pressure sensor and the mea- sured supply duct static pressure is below the configurable SP Low Alert Limit (DP.L), then Alert 310 will occur.

  • Page 74: Discrete Switch Logic Configuration

    This is used when field-supplied switches or input devices are used instead of Carrier devices. The normally open or normally closed setting may be different on a field-supplied device.

  • Page 75: Hot Gas Bypass

    ITEM EXPANSION SW.LG SWITCH LOGIC: NO / NC FTS.L Filter Status Inpt-Clean IGC.L IGC Feedback - Off RMI.L RemSw Off-Unoc-Strt-NoOv ECS.L Economizer Switch - No SFS.L Fan Status Sw. - Off DL1.L Dmd.Lmt.Sw.1 - Off DL2.L Dmd.Lmt.2 Dehumid - Off IAQ.L IAQ Disc.Input - Low FSD.L...
  • Page 76 Table 92 — Remote Switch Logic Configuration REMOTE SWITCH LOGIC SWITCH REMOTE INPUT STATE CONFIGURATION STATUS (RMI.L) OPEN OPEN CLOSED OPEN CLOSED CLOSED   Monday In Period (PER.X DAYS able is used to include or remove Monday from the schedule. Each period is assigned an occupied on and off time.

  • Page 77: Troubleshooting

    ITEM TIME TIME OF DAY HH.MM Hour and Minute DATE MONTH,DATE,DAY AND YEAR MNTH Month of Year Day of Month Day of Week YEAR Year SCH.L LOCAL TIME SCHEDULE PER.1 PERIOD 1  PER.1 DAYS DAY FLAGS FOR PERIOD 1 ...

  • Page 78: Transducer Troubleshooting

    Transducer Troubleshooting — AW,AY units, the electronic control uses 2 suction pressure transducers to measure the suction pressure of circuits A and B. The pressure/voltage characteristics of these transducers are in shown in Tables 101 and 102. On 48/50A2,A3,A4,A5 units, the electronic control uses 4 pressure transducers to measure PROBLEM COMPRESSOR DOES NOT RUN...
  • Page 79 PROBLEM COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low. 2. Head pressure low. 3. Air filters dirty. 4. Expansion valve power head defective. 5. Indoor coil partially iced. 6. Indoor airflow restricted. Suction Pressure High Heat load excessive. UNIT OPERATES TOO LONG OR CONTINUOUSLY 1.
  • Page 80 PROBLEM Burners Will Not Ignite. Active alarm. No power to unit. No power to IGC (Integrated Gas Control). Heaters off due to time guard to prevent short cycling. Control calling for Cooling. No gas at main burners. Water in gas line. Inadequate Heating.
  • Page 81 LEGEND IDM — Induced-Draft Motor IGC — Integrated Gas Unit Controller NOTE: Thermostat Fan Switch in the “AUTO” position. Fig. 14 — IGC Service Analysis Logic A48-5656...
  • Page 82 Table 97 — 5K Thermistor Temperature vs. Resistance (SCT Sensors) (English) VOLTAGE TEMP RESISTANCE DROP (Ohms) –25 3.699 98,010 –24 3.689 94,707 –23 3.679 91,522 –22 3.668 88,449 –21 3.658 85,486 –20 3.647 82,627 –19 3.636 79,871 –18 3.624 77,212 –17 3.613 74,648...
  • Page 83 Table 98 — 5K Thermistor Temperature vs. Resistance (SCT Sensors) (SI) VOLTAGE TEMP RESISTANCE DROP (Ohms) –32 3.705 100,260 –31 3.687 94,165 –30 3.668 88,480 –29 3.649 83,170 –28 3.629 78,125 –27 3.608 73,580 –26 3.586 69,250 –25 3.563 65,205 –24 3.539 61,420...
  • Page 84 Table 99 — 10K Thermistor vs. Resistance (T55, T56, OAT, RAT, EDT, LAT Sensors) (English) TEMP VOLTAGE RESISTANCE DROP (V) (Ohms) –25 4.758 196,453 –24 4.750 189,692 –23 4.741 183,300 –22 4.733 177,000 –21 4.724 171,079 –20 4.715 165,238 –19 4.705 159,717 –18...
  • Page 85 Table 100 — 10K Thermistor vs. Resistance (T55, T56, OAT, RAT, EDT, LAT Sensors) (SI) TEMP VOLTAGE RESISTANCE DROP (V) (Ohms) –32 4.762 200,510 –31 4.748 188,340 –30 4.733 177,000 –29 4.716 166,342 –28 4.700 156,404 –27 4.682 147,134 –26 4.663 138,482 –25...
  • Page 86 Table 102 — Suction Pressure Transducer Pressure (PSIG) vs. Voltage (SP-A, SP-B, SP.XR = 1, PRESSURE VOLTAGE PRESSURE (PSIG) DROP (V) (PSIG) 0.500 0.520 0.540 0.560 0.580 0.600 0.620 0.640 0.660 0.680 0.700 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880 0.900...
  • Page 87 Table 103 — Suction Pressure Transducer (PSIG) vs. Voltage (SP-A, SP-B, 48/50A2,A3,A4,A5 Units Only) PRESSURE VOLTAGE PRESSURE (PSIG) DROP (V) (PSIG) 0.466 0.476 0.486 0.495 0.505 0.515 0.525 0.535 0.545 0.554 0.564 0.574 0.584 0.594 0.604 0.614 0.623 0.633 0.643 0.653 0.663 0.673...
  • Page 88 Table 104 — Discharge Pressure Transducer (PSIG) vs. Voltage (DP-A, DP-B, PRESSURE VOLTAGE PRESSURE (PSIG) DROP (V) (PSIG) 14.5 0.500 0.509 0.515 0.521 0.528 0.534 0.540 0.546 0.552 0.558 0.564 0.570 0.577 0.583 0.589 0.595 0.601 0.607 0.613 0.620 0.626 0.626 0.632 0.638...
  • Page 89 Table 104 — Discharge Pressure Transducer (PSIG) vs. Voltage (DP-A, DP-B, PRESSURE VOLTAGE PRESSURE (PSIG) DROP (V) (PSIG) 2.483 2.489 2.495 2.502 2.508 2.514 2.520 2.526 2.532 2.538 2.544 2.551 2.557 2.563 2.569 2.575 2.581 2.587 2.593 2.600 2.606 2.612 2.618 2.624 2.630...

  • Page 90: Forcing Inputs And Outputs

    Forcing Inputs and Outputs — be forced both from the CCN and directly at the local display. This can be useful during diagnostic testing and also during operation, typically as part of an advanced third party control scheme. See Appendices A and B. NOTE: In the case of a power reset, any force in effect at the time of the power reset will be cleared.

  • Page 91: Auto View Of Run Status

    Cap Threshold Subtracting (Z.MIN) — This parameter is used in the calculation of SMZ and is calculated as follows:   Z.MIN = Configuration COOL (–SUB.R))) * 0.6 Cap Threshold Adding (Z.PLU) — This parameter is used in the calculation of SMZ and is calculated as follows: ...

  • Page 92: Cooling Information

    Table 107 — Cooling Information Display Table ITEM EXPANSION COOL COOLING INFORMATION C.CAP Current Running Capacity CUR.S Current Cool Stage REQ.S Requested Cool Stage MAX.S Maximum Cool Stages DEM.L Active Demand Limit SUMZ COOL CAP. STAGE CONTROL Capacity Load Factor ADD.R Next Stage EDT Decrease SUB.R...

  • Page 93: Time Guard Display Table

    ITEM EXPANSION TMGD TIMEGUARDS TG.A1 Compressor A1 Timeguard TG.A2 Compressor A2 Timeguard TG.B1 Compressor B1 Timeguard TG.B2 Compressor B2 Timeguard TG.H1 Heat Relay 1 Timeguard TG.H2 Heat Relay 2 Timeguard TG.H3 Heat Relay 3 Timeguard TG.H4 Heat Relay 4 Timeguard TG.H5 Heat Relay 5 Timeguard TG.H6...
  • Page 94 ALARM OR ALERT DESCRIPTION NUMBER A051 Circuit A, Compressor 1 Stuck On Failure P051 Circuit A, Compressor 1 Failure T051 Circuit A, Compressor 1 Failure A052 Circuit A, Compressor 2 Stuck On Failure P052 Circuit A, Compressor 2 Failure T052 Circuit A, Compressor 2 Failure A055 Circuit B, Compressor 1 Stuck On Failure...
  • Page 95 ALARM DESCRIPTION ALERT NUMBER T300 Space Temperature Below Limit T301 Space Temperature Above Limit T302 Supply Temperature Below Limit T303 Supply Temperature Above Limit T304 Return Temperature Below Limit T305 Return Temperature Above Limit T308 Return Air Relative Humidity Below Limit T309 Return Air Relative Humidity Above Limit T310...
  • Page 96 IMPORTANT: If the compressor starts, verify that the indoor and outdoor fans are operating properly. IMPORTANT: If the CS is always detecting current, then verify that the compressor is on. If the compressor is on, check the contactor and the relay on the MBB. If the com- pressor is off and there is no current, verify CS wiring and replace if necessary.
  • Page 97 any elements of the control which requires its use including economizer differential enthalpy control. The RA.RH sensor is located in the return air section near the auxiliary control box. The sensor is a loop powered 4 to 20 mA sensor. This alert resets automatically. The cause of the alert is usually a faulty sensor, a shorted or open sensor caused by a wiring error, or a loose connection.
  • Page 98 compressor is brought on and 5 seconds afterwards. The rate of suction pressure change from 5 seconds before the compressor is brought on to when the compressor is brought on is calculat- ed. Then the rate of suction pressure change from when the compressor is brought on to 5 seconds afterwards is calculated.
  • Page 99 T301 (Space Temperature Above Limit) — If the space tem- perature is above the configurable SPT High Alert  Limits (occupied [Configuration ALLM 5 minutes or unoccupied [Configuration for 10 minutes), then an alert will be broadcast. The alert will automatically reset.
  • Page 100 Because the Dirty Air Filter switch can be configured nor- mally opened or closed, the switch might be open or closed. The configuration for this switch input can be found at variable   Configuration SW.LG SFS.L. Verify that the configura- tion is set correctly.

  • Page 101: Major System Components

    MBB also continuously monitors additional data from the optional ECB1, ECB2, SCB, and CEM boards through the LEN communications port. The MBB also interfaces with the Carrier Comfort Network ® system through the CCN communi- cations port. The board is located in the main control box.
  • Page 102 Fig. 15 — Typical Main Control Box Wiring Schematic (48/50AJ,AK,AW,AY Units) RED JUMPER WIRE MUST BE ADDED BETWEEN R AND W1 FOR UNITS EQUIPPED WITH HEAT IN NON-THERMOSTAT APPLICATIONS NEXT PAGE a48-8355...
  • Page 103 Fig. 15 — Typical Main Control Box Wiring Schematic (48/50AJ,AK,AW,AY Units) (cont) a48-8355...
  • Page 104 a48-8355...
  • Page 105 NEXT PAGE A48-7294 Fig. 17 — Typical Auxiliary Control Box Wiring Schematic...
  • Page 106 a48-8356 Fig. 17 — Typical Auxiliary Control Box Wiring Schematic (cont)
  • Page 107 a48--8357 Fig. 18 — Typical 2 Stage Gas Heat Wiring Schematic (Size 051 and 060 Units Shown)
  • Page 108 NEXT PAGE A48-7296 Fig. 19 — Typical Staged Gas Heat Wiring Schematic (Size 051 and 060 Units Shown)
  • Page 109 A48-8358 Fig. 19 — Typical Staged Gas Heat Wiring Schematic (Size 051 and 060 Units Shown) (cont)
  • Page 110 a50-8228...
  • Page 111 NEXT PAGE A48-7298 Fig. 21 — Typical Power Schematic (48/50AJ,AK,AW,AY051 and 060 Units Shown)
  • Page 112 FROM PREVIOUS PAGE a48-8360 Fig. 21 — Typical Power Schematic (48/50AJ,AK,AW,AY051 and 060 Units Shown) (cont)
  • Page 114 a48-8361...
  • Page 115 a48-8362...
  • Page 116 A48-7302...
  • Page 117 — Building Pressure Transducer — Contactor, Compressor — Capacitor — Circuit Breaker — Control Circuit Breaker — Crankcase Heater — Carrier Comfort Network — Controls Expansion Module COMP — Compressor Motor — Control Relay — Compressor Safety — Compressor Current Sensing Board —...
  • Page 118 1 = Closes RLY9A/RLY9B 7 = 8 = RLY10A, 9 = RLY10B 1 = Closes RLY10A/RLY10B 1 = 2 = RLY11A, 3 = RLY11B 1 = Closes RLY11A/RLY11B YELLOW LED - CCN (CARRIER COMFORT NETWORK) INSTANCE JUMPER (SET TO 1)
  • Page 119 Table 116 — Economizer Control Board (ECB1) Inputs and Outputs POINT POINT DESCRIPTION NAME INPUTS RMTIN Remote occupancy ECONENBL, Economizer enable ECOORIDE RARH Return air relative humidity OARH Outdoor air relative humidity OUTPUTS ECB1_AO1 ECB1, analog output 1 ECONOCMD Economizer actuator (digital control) PE_A Power Exhaust stage A...
  • Page 120 Table 117 — VAV Control Board (ECB2) Inputs and Outputs POINT POINT DESCRIPTION NAME INPUTS Building static pressure Supply Duct static pressure OUTPUTS SFAN_VFD Supply Fan Inverter speed Minimum load valve ADDRESS DIP SWITCHES ALL ON CEBD430427 XDCR/THERM Fig. 28 — Staged Gas Heat Control Board (SCB) I/O POINT PLUG AND PIN NAME...
  • Page 121 Table 118 — Staged Gas Control Board (SCB) Inputs and Outputs POINT I/O POINT POINT DESCRIPTION NAME INPUTS LAT1SGAS Leaving air temperature 1 LAT2SGAS Leaving air temperature 2 LAT3SGAS Leaving air temperature 3 OUTPUTS Heat Stage 3 Heat Stage 4 Heat Stage 5 Heat Stage 6 CEBD430351...
  • Page 122 Table 119 — Controls Expansion Board (CEM) Inputs POINT POINT DESCRIPTION NAME INPUTS Supply Fan Status switch DMD_SW1 Demand Limit - SW1 DMD_SW2/ Demand Limit - SW2/ DHD ISCIN Dehumidification Switch Input PRES Pressurization EVAC Evacuation PURG Purge IAQIN Indoor Air Quality Switch DMDLMTMA 4-20mA Demand Limit EDTRESMA...
  • Page 123 – Table 121 — VFD Terminal Designations TERMINAL FUNCTION Three-Phase Main Circuit Input Power Supply Three-Phase AC Output to Motor, 0 V to Maximum Input Voltage Level X1-11 (GND) X1-12 (COMMON) Factory-supplied jumper X1-10 (24 VDC) X1-13 (DI-1) Run (factory-supplied jumper) X1-10 (24 VDC) Start Enable 1 (factory-supplied jumper).

  • Page 124: Accessory Control Components

    BOARD ADDRESSES — Each board in the system has an address. The MBB has a default address of 1 but it does have an instance jumper that should be set to 1 as shown in Fig. 26. For the other boards in the system there is a 4-dip switch head- er on each board that should be set as shown below.
  • Page 125 Table 122 — Field Connection Terminal Strips TERMINAL TERMINAL BOARD TB-1 - POWER CONNECTION OR DISCONNECT (in Main Control Box) L1 power supply L2 power supply L3 power supply TB-2 - GROUND (in Main Control Box) Neutral Power TB-3 - CCN COMMUNICATIONS (HY84HA096) (in Main Control Box) LEN + LEN C LEN –...
  • Page 126 J4 connectors). A 3-wire sensor bus accomplishes commu- nication between modules. These 3 wires run in parallel from module to module. Yellow LED — The MBB has one yellow LED. The Carrier Comfort Network ® (CCN) LED will blink during times of network communication.
  • Page 127 CCN SITE NON CARRIER HVAC EQUIPMENT COMFORT CONTROLLER LEGEND — Carrier Comfort Network ® — ComfortID™ Controls — ComfortLink™ Controls HVAC — Heating, Ventilation, and Air Conditioning 5. Restore power to unit. IMPORTANT: A shorted CCN bus cable will prevent some routines from running and may prevent the unit from starting.

  • Page 128: Service

    SERVICE WARNING Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury. All unit components can be reached Service Access — through clearly labelled hinged access doors. These doors are not equipped with tiebacks, so if heavy duty servicing is need- ed, either remove them or prop them open to prevent accidental closure.
  • Page 129 ® tend the life of coils. This cleaner is available from Carrier Re- placement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container.

  • Page 130: Lubrication

    11. Ensure surfaces are not allowed to dry before rinsing. Reapplying cleaner as needed to ensure 10-minute satura- tion is achieved. 12. Thoroughly rinse all surfaces with low velocity clean wa- ter using downward rinsing motion of water spray nozzle. Protect fins from damage from the spray nozzle.

  • Page 131: Evaporator Fan Service And Replacement

    7. Outside of the unit, assemble the flex members to the cen- ter drive shaft with 4 bolts and nuts. The flex members have collars that need to be inserted into the smaller hole of the drive shaft flange. 8. Assemble the flex member/drive shaft assembly to one of the shaft flanges, using 2 bolts and nuts.

  • Page 132: Condenser-Fan Adjustment

    Amount of refrigerant charge is Refrigerant Charge — listed on unit nameplate. Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure.
  • Page 133 20 Ton MCHX CIRCUIT A Charging Chart All Compressors on a Circuit Must be Operating Reduce Charge if Above Curve 20 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating Reduce Charge if Above Curve LEGEND MCHX—...
  • Page 134 25 and 27 Ton MCHX CIRCUIT A Charging Chart All Compressors on a Circuit Must be Operating Reduce Charge if Above Curve 25 and 27 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating Reduce Charge if Above Curve LEGEND MCHX—...
  • Page 135 30 Ton MCHX CIRCUIT A Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve Outdoor Air Temperature (deg F) 30 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve Outdoor Air Temperature (deg F)
  • Page 136 35 Ton MCHX CIRCUIT A Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve 35 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve LEGEND...
  • Page 137 Reduce Charge if Above Curve LEGEND MCHX— Microchannel Heat Exchanger — Saturated Suction Temperature Fig. 48 — Charging Chart — 48/50A2,A3,A4,A5040 with R-410A Refrigerant Reduce Charge if Above Curve LEGEND MCHX— Microchannel Heat Exchanger — Saturated Suction Temperature Fig. 49 — Charging Chart — 48/50A2,A3,A4,A5050 with R-410A Refrigerant 40 Ton MCHX Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating...
  • Page 138 60 Ton MCHX CIRCUIT A Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve Outdoor Air Temperature (deg F) 60 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating Reduce Charge if Above Curve Outdoor Air Temperature (deg F)

  • Page 139: Main Burners

    Replace whenever refrigerant system is ex- Filter Drier — posed to atmosphere. A complete list of replacement Replacement Parts — parts may be obtained from any Carrier distributor upon request. A48-3733 OUTLET PRESSURE TAP (ON SIDE) 1/8-IN. 27 NPT LOW-FIRE REGULATOR...

  • Page 140: Appendix A - Local Display Tables

    ITEM EXPANSION VIEW AUTO VIEW OF RUN STATUS  HVAC ascii string spelling out the hvac modes  Occupied ?  Mixed Air Temperature  Evaporator Discharge Tmp  Leaving Air Temperature  EC.C.P Economizer Control Point  ECN.P Economizer Act.Curr.Pos. ...
  • Page 141 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION TMGD TIMEGUARDS  TG.A1 Compressor A1 Timeguard  TG.A2 Compressor A2 Timeguard  TG.B1 Compressor B1 Timeguard  TG.B2 Compressor B2 Timeguard  TG.H1 Heat Relay 1 Timeguard  TG.H2 Heat Relay 2 Timeguard ...
  • Page 142 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION AIR.P AIR PRESSURES  Static Pressure  Building Pressure REF.P REFRIGERANT PRESSURES  DP.A Cir A Discharge Pressure  SP.A Cir A Suction Pressure  DP.B Cir B Discharge Pressure  SP.B Cir B Suction Pressure ITEM...
  • Page 143 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION 4-20 4-20 MILLIAMP INPUTS  IAQ.M IAQ Milliamps  OAQ.M OAQ Milliamps  SP.R.M SP Reset milliamps  DML.M 4-20 ma Demand Signal  EDR.M EDT Reset Milliamps  ORH.M OARH Milliamps ...
  • Page 144 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION COOL COOLING CONFIGURATION  Z.GN Capacity Threshold Adjst  MC.LO Compressor Lockout Temp  C.FOD Fan-Off Delay, Mech Cool  Min. Load Valve? (HGBP)  M.M. Motor Master Control  HPSP Head Pressure Setpoint ...
  • Page 145 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION BUILDING PRESS. CONFIG  BP.CF Building Press. Config  BP.RT Bldg.Pres.PID Run Rate  BP.P Bldg. Press. Prop. Gain  BP.I Bldg.Press.Integ.Gain  BP.D Bldg.Press.Deriv.Gain  BP.SO BP Setpoint Offset  BP.MN BP VFD Minimum Speed ...
  • Page 146 APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM EXPANSION CCN CONFIGURATION  CCNA CCN Address  CCNB CCN Bus Number  BAUD CCN Baud Rate  BROD CCN BROADCST DEFINITIONS   BROD TM.DT CCN Time/Date Broadcast   BROD OAT.B CCN OAT Broadcast ...

  • Page 147: Appendix A — Local Display Tables

    APPENDIX A — LOCAL DISPLAY TABLES (cont) ITEM TIME TIME OF DAY  HH.MM Hour and Minute DATE MONTH,DATE,DAY AND YEAR  MNTH Month of Year  Day of Month  Day of Week  YEAR Year SCH.L LOCAL TIME SCHEDULE ...

  • Page 148: Appendix B - Ccn Tables

    All A Series units with ComfortLink™ controls have a port for interface with the Carrier Comfort Network system. On TB3 there is a J11 jack which can be used for temporary connection to the CCN network or to computers equipped with CCN software like the Service Tool. Also on TB3 there are screw connections that can be used for more permanent CCN connections.
  • Page 149 TABLE DISPLAY NAME GENERAL Occupied ? Static Pressure Building Pressure Outside Air Rel.Humidity Return Air Rel.Humidity Space Temperature Offset Supply Air Setpnt. Reset Static Pressure Reset IAQ - PPM Return CO2 OAQ - PPM Return CO2 IAQ Min.Pos.Override GENERIC 20 points dependent upon the configuration of the “generics”...
  • Page 150 TABLE DISPLAY NAME TEMPS Air Temp Lvg Supply Fan Return Air Temperature Outside Air Temperature Space Temperature Space Temperature Offset Staged Gas LAT Sum Staged Gas LAT 1 Staged Gas LAT 2 Staged Gas LAT 3 Staged Gas Limit Sw.Temp Cir A Sat.Condensing Tmp Cir B Sat.Condensing Tmp Cir A Sat.Suction Temp.
  • Page 151 TABLE NAME SET_PNT Occupied Heat Setpoint Occupied Cool Setpoint Unoccupied Heat Setpoint Unoccupied Cool Setpoint Heat-Cool Setpoint Gap VAV Occ. Cool On Delta VAV Occ. Cool Off Delta Supply Air Setpoint Supply Air Setpoint Hi Supply Air Setpoint Lo Heating Supply Air Setpt Tempering Purge SASP Tempering in Cool SASP Tempering in Vent Occ SASP...
  • Page 152 TABLE NAME SCHEDOVR Schedule Number Accept Global Holidays? Override Time Limit Timed Override Hours Accepting an Override: SPT Override Enabled ? T58 Override Enabled ? Allowed to Broadcast a Global Sched. Override ? SET_PNT Occupied Heat Setpoint Occupied Cool Setpoint Unoccupied Heat Setpoint Unoccupied Cool Setpoint Heat-Cool Setpoint Gap...
  • Page 153 TABLE NAME COOL Capacity Threshold Adjust Compressor Lockout Temp Fan-off Delay, Mech Cool Minimum Load Valve? Motor Master Control ? Head Pressure Setpoint Enable Compressor A1 Enable Compressor A2 Enable Compressor B1 Enable Compressor B2 CSB A1 Feedback Alarm CSB A2 Feedback Alarm CSB B1 Feedback Alarm CSB B2 Feedback Alarm Rev.
  • Page 154 TABLE NAME HEAT Heating Control Type Heating Supply Air Setpt Occupied Heating Enabled MBB Sensor Heat Relocate Fan-off Delay, Gas Heat Fan-off Delay, Elec Heat Staged Gas Heat Type Max Cap Change per Cycle S.Gas DB min.dF/PID Rate St.Gas Temp. Dead Band Heat Rise dF/sec Clamp LAT Limit Config Heat Control Prop.
  • Page 155 TABLE NAME SWLG Filter Status Inpt-Clean IGC Feedback - Off RemSw Off-Unoc-Strt-NoOv Economizer Switch - No Fan Status Sw. - Off Dmd.Lmt.Sw.1 - Off Dmd.Lmt.-Dehumid - Off IAQ Disc.Input - Low Fire Shutdown - Off Press. Switch - Off Evacuation Sw. - Off Smoke Purge Sw.
  • Page 156 TABLE DISPLAY NAME ALARMS01 Active Alarm ------------------------ Active Alarm ------------------------ Active Alarm ------------------------ Active Alarm ------------------------ follow same format for… ALARMS02 ALARMS03 ALARMS04 ALARMS05 COMPRESR Compressor A1 Relay Compressor A1 Feedback Curr.Sens.Brd. A1 Status CSB A1 Feedback Alarm Comp A1 Locked Out ? Compressor A1 Strikes Enable Compressor A1 Compressor A2 Relay...
  • Page 157 TABLE DISPLAY NAME ECON_MIN Econo Damper Command Pos Econo Damper Current Pos Econo Current Min. Pos. Diff.Air Quality in PPM Econo Position Override IAQ Min.Pos.Override Econ Remote 10K Pot Val. IAQ - PPM Return CO2 OAQ - PPM Return CO2 IAQ - Discrete Input IAQ Demand Vent Min.Pos.
  • Page 158 TABLE DISPLAY NAME ENTHALPY Outdoor Air Enthalpy Outside Air Temperature Outside Air Rel.Humidity Outside Air RH Sensor OA Dewpoint Temp Limit OutsideAir DewPoint Temp OutsideAir Humidty Ratio OA H2O Vapor Sat.Pressur OA H2O Partial.Press.Vap Return Air Enthalpy Return Air Temperature Controlling Return Temp Return Air Rel.Humidity Return Air Temp Sensor...
  • Page 159 TABLE DISPLAY NAME PRESBLDG Building Pressure Econo Damper Current Pos Power Exhaust Stage A Power Exhaust Stage B Power Exhaust Stage C BP Load Factor BP Rise Per Stage BP PID/Integral Term BP PID Threshold BP Deadband Building Pressure Error Rate of Chng of BPERROR High BP Override Low BP Override...

  • Page 160: Appendix B — Ccn Tables

    TABLE DISPLAY NAME TESTCOOL Compressor A1 Relay Compressor A2 Relay Min. Load Valve (HGBP) Compressor B1 Relay Compressor B2 Relay TESTFANS Supply Fan Relay Supply Fan VFD Speed Condenser Fan Circuit A Condenser Fan Circuit B TESTHEAT Requested Heat Stage Heat Relay 1 Heat Relay 2 Relay 3 W1 Gas Valve 2...

  • Page 161: Appendix C - Vfd Information

    On variable air volume units with optional VFD, the supply fan speed is controlled by a 3-phase VFD. The VFD is located in the supply fan section behind a removable panel. The VFD speed is controlled directly by the ComfortLink™ controls through a 4 to 20 mA signal based on a supply duct pressure sensor.
  • Page 162 The Carrier Assistant will ask “Is this an Air Handler or Rooftop?” Select “Rooftop.” b. The Carrier Assistant will ask “Is this a High E or Premium E motor?” Select the correct efficiency type.
  • Page 163 A rotating blinking arrow indicates that the drive is running but not at set point. A stationary arrow indicates that the drive is stopped. For Carrier rooftop units, the correct rotation is counterclockwise. The upper right corner shows the frequency set point that the drive will maintain.
  • Page 164 APPENDIX C — VFD INFORMATION (cont) CHANGED PARAMETERS MODE — The Changed Param- eters mode is used to view and edit recently changed parameters on the drive. To view the changed parameters, perform the following procedure: 1. Select MENU (SOFT KEY 2). The Main menu will be displayed.
  • Page 165 VFD requires very little maintenance. Table E lists the routine maintenance intervals recommend- ed by Carrier. HEAT SINK — The heat sink fins accumulate dust from the cooling air. Since a dusty sink is less efficient at cooling the drive, overtemperature faults become more likely.
  • Page 166 UNDERLOAD UNDERLOAD CURVE. THERM FAIL Internal fault. The thermistor measuring the internal temperature of the drive is open or shorted. Contact Carrier. OPEX LINK Internal fault. A communication-related problem has been detected between the OMIO and OINT boards. Contact Carrier.
  • Page 167 APPENDIX C — VFD INFORMATION (cont) ALARM ALARM NAME CODE IN PANEL Reserved 2001 — Reserved 2002 — Reserved 2003 — The change in direction being attempted is not allowed. Do not attempt to change the direction of motor rota- 2004 DIR LOCK tion, or Change parameter 1003 DIRECTION to allow direction change (if reverse operation is safe).
  • Page 168 If the drive is operated in a critical part of a process, fan replacement is recommended once these symptoms start appearing. Replacement fans are available from Carrier. To replace the main fan for frame sizes R1 through R4, perform the following (see Fig. D): 1.

  • Page 169: Appendix C — Vfd Information

    APPENDIX C — VFD INFORMATION (cont) A48-7716 Fig. F — Internal Enclosure Fan Replacement...

  • Page 170: Process

    APPENDIX D — MODE SELECTION PROCESS The following section is to be used in conjunction with Fig. 4 on page 34. To help determine why the unit controls are in a certain mode, the programming logic is provided below. The software will proceed, step by step, until a mode is reached.

  • Page 171: Appendix E - Upc Open Controller

    APPENDIX E — UPC OPEN CONTROLLER The following section is used to configure the UPC Open. The UPC Open controller is mounted in a separate enclosure below the main control box. To Address the UPC Open Controller — user must give the UPC Open controller an address that is unique on the BACnet* network.
  • Page 172 EIA-485 and 2W. The example in Fig. C shows the BAS Port DIP Switches set for 76.8k (Carrier default) and MS/TP. Set the BAS Port DIP Switches DS2 and DS1 for the appro- priate communications speed of the MS/TP network (9600, 19.2k, 38.4k, or 76.8k bps).
  • Page 173 APPENDIX E — UPC OPEN CONTROLLER (cont) To install a BT485 terminator, push the BT485 terminator, on to the BT485 connector located near the BACnet connector. NOTE: The BT485 terminator has no polarity associated with To order a BT485 terminator, consult Commercial Products i-Vu ®...
  • Page 174 APPENDIX E — UPC OPEN CONTROLLER (cont) Table D — Open System Wiring Specifications and Recommended Vendors WIRING SPECIFICATIONS Wire Type 22 AWG, single twisted shielded pair, low capacitance, CL2P, TC foam FEP, plenum rated. See MS/TP Installation Guide for specifications.
  • Page 175 14 flashes per second, alternating with Run LED 14 flashes per second Troubleshooting — dressing the UPC Open controller, contact Carrier Technical Support. COMMUNICATION LEDS — The LEDs indicate if the controller is communicating with the devices on the network.
  • Page 176 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID AV:9 Active Demand Limit AV:10 Air Temp Lvg Supply Fan AV:11 CEM AN1 4-20 ma J5,1-2 AV:12 CEM AN1 10K temp J5,1-2 AV:13 CEM AN2 4-20 ma J5,3-4 AV:14 CEM AN2 10K temp J5,3-4 AV:15...
  • Page 177 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID AV:61 Dmd Level(+) Hi Cool ON AV:62 Dmd Level(+) Hi Heat ON AV:63 Dmd Level Low Cool ON AV:64 Dmd Level Low Heat ON AV:66 Econo Current Min. Pos. AV:67 Economizer Act.
  • Page 178 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID AV:134 Return Air Relative Humidity AV:135 Return Air Temperature AV:136 Schedule Number AV:137 Space Temperature AV:138 Space Temperature Offset AV:139 Space Temp Offset Range AV:143 SP Reset Limit AV:144 SP Reset Ratio AV:150...
  • Page 179 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID AV:1009 IAQ - PPM Indoor CO2 AV:1016 Static Pressure AV:1022 HVAC Mode Numerical Form AV:1023 Current Running Capacity AV:1024 Cooling Control Point AV:1025 Heating Control Point AV:1027 Leaving Air Temperature AV:1028 Economizer Act.
  • Page 180 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID BV:9 Alarm State BV:10 Capacity Clamp Mode BV:11 Fan request from IGC BV:12 Comp A1 Locked Out ? BV:13 Comp A2 Locked Out ? BV:14 Comp B1 Locked Out ? BV:15 Comp B2 Locked Out ? BV:16...
  • Page 181 APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID BV:59 Local Machine Disable BV:60 Low BP Override BV:61 Low Temp Cap Override BV:63 Mech Cooling Locked Out BV:64 Min. Load Valve (HGBP) BV:67 OAEC- OA Enth Lockout? BV:68 OAQ Lockout In Effect ? BV:69...

  • Page 182: Appendix E — Upc Open Controller

    APPENDIX E — UPC OPEN CONTROLLER (cont) BACNET POINT NAME OBJECT ID BV:1052 Filter Status Input BV:1060 Evacuation Input BV:1061 Pressurization Input BV:1062 Smoke Purge Input BV:2001 Supply Fan State BV:2004 Supply Fan Request BV:2008 Occupied? BV:2012 Condenser Fan Circuit A BV:2013 Condenser Fan Circuit B BV:2014...

  • Page 183: Index

    Alarm output Alarms and alerts Alert limit configuration Auto view of run status Basic control usage Building pressure configuration Building pressure control Carrier Comfort Network ® (CCN) System CCN tables and display CCN tables 148-160 Cleaning ComfortLink™ controls...
  • Page 184 Copyright 2010 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480077-01 Printed in U.S.A. Form 48/50A-9T Pg 184 6-10 Replaces: 48/50A-7T...

  • Page 185: Controls Set Point And Configuration Log

    CONTROLS SET POINT AND CONFIGURATION LOG MODEL NUMBER: SERIAL NUMBER: DATE: TECHNICIAN: ITEM UNIT UNIT CONFIGURATION  C.TYP Machine Control Type  CV.FN Fan Mode (0=Auto, 1=Cont)  RM.CF Remote Switch Config  CEM Module Installed  TCS.C Temp.Cmp.Strt.Cool Factr ...
  • Page 186 ITEM EXPANSION HEAT HEATING CONFIGURATION  HT.CF Heating Control Type  HT.SP Heating Supply Air Setpt  OC.EN Occupied Heating Enabled  LAT.M MBB Sensor Heat Relocate  G.FOD Fan-Off Delay, Gas Heat  E.FOD Fan-Off Delay, Elec Heat  SG.CF STAGED GAS CONFIGS ...
  • Page 187 ITEM BUILDING PRESS. CONFIG  BP.CF Building Press. Config  BP.RT Bldg.Pres.PID Run Rate  BP.P Bldg. Press. Prop. Gain  BP.I Bldg.Press.Integ.Gain  BP.D Bldg.Press.Deriv.Gain  BP.SO BP Setpoint Offset  BP.MN BP VFD Minimum Speed  BP.MX BP VFD Maximum Speed ...
  • Page 188 ITEM EXPANSION   AQ.S.R IQ.R.L IAQ Low Reference   AQ.S.R IQ.R.H IAQ High Reference   AQ.S.R OQ.R.L OAQ Low Reference   AQ.S.R OQ.R.H OAQ High Reference  IAQ.P IAQ PRE-OCCUPIED PURGE   IAQ.P IQ.PG IAQ Purge ...
  • Page 189 ITEM SW.LG SWITCH LOGIC: NO / NC  FTS.L Filter Status Inpt-Clean  IGC.L IGC Feedback - Off  RMI.L RemSw Off-Unoc-Strt-NoOv  ECS.L Economizer Switch - No  SFS.L Fan Status Sw. - Off  DL1.L Dmd.Lmt.Sw.1 - Off ...
  • Page 190 REFRIGERANT DISCHARGE CIRCUIT NO. 2 __________ PSIG  VERIFY REFRIGERANT CHARGE. Copyright 2010 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480077-01 Printed in U.S.A.

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