Lennox XC20-036-230-01 Installation And Service Procedure
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Lennox XC20-036-230-01 Installation And Service Procedure

Elite xc20 series
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Service Literature
IMPORTANT
XC20 units have refrigerant piping requirements that are
unique to this unit. Size and install the refrigerant piping
per table 2 (page 14) to ensure proper unit operation.
IMPORTANT:
Before applying any power (main or low voltage) to the outdoor
unit, confirm that the iComfort Wi-Fi ® or iComfort ® S30
thermostat has software Version 2.1 or higher installed.
(Reference the iComfort Wi-Fi ® or iComfort ® S30 thermostat
manual.)
This unit is an integral component of a system that requires an
iComfort ®
®
iComfort
Wi-Fi
or
®
iComfort
-enabled air handler or furnace.
iComfort
thermostat
XC20
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be
performed by a licensed
equivalent) or a service agency.
INSTALLATION AND SERVICE
PROCEDURE
Elite Series
S30
thermostat
®
iComfort Wi-Fi
thermostat
®
S30
®
iComfort
-enabled
air handler or
furnace
professional installer (or
Corp. 1407-L10
August 25, 2015
®
XC20 Units

TABLE OF CONTENTS

I. OVERVIEW
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and
®
Appendix - Charging Sticker . . . . . . . . . . . . . . . . . . . .
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs AND HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
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IMPORTANT
2015 Lennox Industries Inc.
XC20
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Summary of Contents for Lennox XC20-036-230-01

  • Page 1: Table Of Contents

    Installation and service must be Approved methods of recovery, recycling or reclaiming performed by a licensed professional installer (or must be followed. Fines and/or incarceration may be equivalent) or a service agency. levied for noncompliance. 2015 Lennox Industries Inc.

  • Page 2: Model Number Identification

    Outdoor Fan Model Number Sound Rating Number (dB) Factory Refrigerant Number of Blades Diameter - inches. Charge Maximum Minimum XC20-036-230-01 8 lbs, 6 oz Unit Outdoor Fan Model Number Sound Rating Number (dB) Factory Refrigerant Number of Blades Diameter - inches.

  • Page 3: Electrical Data

    Model Number Motor Load Rotor Load Circuity current Amps Amps Amps Ampacity Protection (RLA) (LRA) (FLA) (amps) XC20-036-230-01 20.6 14.2 13.0 3600 3100 208/230V-60 Hz-1 Ph Unit Compressor Outdoor Fan (RPM varies with compressor RPM) Maximum Rated Locked Full WATTS Minimum...

  • Page 4: Unit Dimensions

    Electric Shock Hazard. Can cause injury or death. Unit This unit must be matched with an indoor coil as must be grounded in accordance with national and local specified in Lennox Product Specification bulletin. codes. Coils previously charged with HCFC-22 must be Line voltage is present at all components when unit is not flushed.

  • Page 5: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement CONTROL PANEL FOR XC20-024 AND -036 OUTDOOR CONTROL DC INVERTER CONTROL GROUND LUG INVERTER REACTOR CONTACTOR-SPST CONTROL PANEL FOR XC20-048 AND -060 OUTDOOR CONTROL DC INVERTER CONTROL INVERTER NOISE FILTER GROUND LUG INVERTER REACTOR CONTACTOR-SPST Figure 1. Control Panel Components XC20...
  • Page 6 This unit must be matched with an indoor coil as As with any mechanical equipment, contact with sharp specified in Lennox Product Specification bulletin. sheet metal edges can result in personal injury. Take care Coils previously charged with HCFC-22 must be while handling this equipment and use protective flushed.

  • Page 7: Operating Service Valves

    When checking the system charge, only use a manifold gauge set that features low loss anti-blow back fittings. See the Lennox Service and Application Note #C-08-1 for further details and information. Manifold gauge set used with HFC-410A refrigerant sys­...

  • Page 8: Service Valves

    SERVICE VALVES ANGLE AND BALL Operating Angle–Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

  • Page 9: Ii. Installation

    II. INSTALLATION PLACING UNIT ON SLAB Unit Placement When installing unit at grade level, the top of the slab should be high enough above grade so that water from higher ground will not collect around the unit. The slab CAUTION should have a slope tolerance as described in figure 5, de­...
  • Page 10 STABILIZING UNIT ON UNEVEN SURFACES ROOF MOUNTING IMPORTANT Locate the unit above a load-bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications. Unit Stabilizer Bracket Use (field-provided): Always use stabilizers when unit is raised above the factory height.
  • Page 11 DETAIL A DETAIL B INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM BUILDING STRUCTURE. Install unit away from windows. BUILDING STRUCTURE MOUNTING SLAB TWO 90°...

  • Page 12: Removing And Installing Panels

    Removing and Installing Panels LOUVERED PANEL REMOVAL IMPORTANT! DO NOT ALLOW PANELS TO HANG ON UNIT BY TOP TAB. TAB IS FOR Remove the louvered panels as follows: ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL. 1. Remove two screws, allowing the panel to swing open slight­ PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.

  • Page 13: New Or Replacement Line Set

    Take care to empty all existing traps. Polyol ester not being installed then proceed to Brazing Connections on (POE) oils are used in Lennox units charged with page 16. HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer.
  • Page 14 COOLING SYSTEM (HFC­410A) stalled. No additional components required. Vertical vapor riser must be sized to the vapor riser listed in Total equivalent length equals 180 feet (all piping and table 3 on systems with line sets longer than 51 feet. fittings included).
  • Page 15 LINE SET IMPORTANT - Refrigerant lines must not contact structure. REFRIGERANT LINE SET — INSTALLING INSTALLATION VERTICAL RUNS (NEW CONSTRUCTION SHOWN) LINE SET ISOLATION — THE FOLLOWING ILLUSTRATIONS ARE EXAM­ NOTE - INSULATE LIQUID LINE WHEN IT IS ROUTED THROUGH AREAS PLES OF PROPER REFRIGERANT LINE SET ISOLATION: WHERE THE SURROUNDING AMBIENT TEMPERATURE COULD BECOME HIGHER THAN THE TEMPERATURE OF THE LIQUID LINE OR WHEN...

  • Page 16: Brazing Connections

    Brazing Connections IMPORTANT Use the procedures outlined in figures 8 and 9 for brazing line set connections to service valves. Allow braze joint to cool before removing the wet rag from the service valve. Temperatures above 250ºF can WARNING damage valve seals. WARNING Danger of fire.
  • Page 17 CAP AND CORE REMOVAL PIPING PANEL REMOVAL AND LINE SET PREPARATION Remove service cap and core from both the suction and liquid line service ports. Remove piping panel for easier access to service valves. Cut ends SERVICE PORT CAP of the refrigerant lines square (free from nicks or dents) and debur the ends.
  • Page 18 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction / vapor valve stem port.

  • Page 19: Flushing The System

    Flushing the System LINE SET AND INDOOR COIL (1 OF 2) TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE (UNCASED COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK TYPICAL EXISTING FIXED ORIFICE (UNCASED COIL ONLY) ORIFICE EXPANSION REMOVAL PROCEDURE (UNCASED COIL HOUSING VALVE DISTRIBUTOR...
  • Page 20 FLUSHING LINE SET AND INDOOR COIL (2 OF 2) TYPICAL NEW CHECK EXPANSION VALVE INSTALLATION PROCEDURE THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE LENNOX XC20 PRODUCT SPECIFICATIONS FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION.

  • Page 21: Leak Testing The System

    Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the...
  • Page 22 LEAK TEST NOTE - NORMALLY, THE HIGH PRESSURE HOSE IS CONNECTED TO THE LIQUID LINE PORT. HOWEVER, CONNECTING IT TO THE VAPOR PORT BETTER PROTECTS THE MANIFOLD GAUGE SET FROM HIGH PRESSURE DAMAGE. LINE SET AND INDOOR COIL HIGH MANIFOLD GAUGE SET CONNECT GAUGE SET CONNECT AN HFC-410A MANIFOLD GAUGE SET HIGH PRESSURE HOSE TO THE VAPOR VALVE SERVICE PORT.

  • Page 23: Evacuating The System

    Evacuating the System LINE SET AND INDOOR COIL MANIFOLD GAUGE SET CONNECT GAUGE SET HIGH NOTE - REMOVE CORES FROM SERVICE VALVES (IF NOT ALREADY DONE). CONNECT LOW SIDE OF MANIFOLD GAUGE SET WITH 1/4 SAE IN-LINE TEE TO VAPOR LINE SERVICE VALVE. CONNECT HIGH SIDE OF MANIFOLD A34000 1/4 SAE TEE WITH GAUGE SET TO LIQUID LINE SERVICE...

  • Page 24: Electrical

    Load Shedding IMPORTANT Use a thermocouple or thermistor electronic vacuum Utility Load Shedding Mode ACTIVATED gauge that is calibrated in microns. Use an instrument (Utility Cycled Unit OFF) – The normally closed set of capable of accurately measuring down to 50 microns. contacts in the utility load shedding control receiver OPEN.
  • Page 25 ROUTE CONTROL WIRES Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with º º a temperature rating of 95 F (35 C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through field-provided field-installed grommet installed in electrical inlet.
  • Page 26 CAUTION Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the unit's electronic controls. ELECTROSTATIC DISCHARGE Precautions will help to avoid control exposure to electrostatic discharge by (ESD) putting the unit, the control and the technician at the same electrostatic potential. Precautions and Procedures Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before performing any service procedure.
  • Page 27 Data Data 24VAC nominal board main 24VAC nominal power input. power input. OEM test 26Vdc transistor output to Lennox factory OEM TOUT tester OEM test pin. In each terminal box: 24VAC nominal 17ma @ P2 ­ Terminal 1 ­ TEST 30VAC P2 ­...
  • Page 28 Table 5 continued. Outdoor Control Terminal Designations and Input /Outputs WARNING - Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. The 4 pins in P6 have the potential of transferring up to 250 volts to the unit cabinet ground. Designator Description Input...

  • Page 29: Servicing Unit Delivered Void Of Charge

    1. Rotate fan to check for binding. Servicing Units Delivered Void of Charge If the outdoor unit is void of refrigerant, clean the system us­ 2. Inspect all factory- and field-installed wiring for loose ing the procedure described below. connections. 1.

  • Page 30: Iii. System Operation And Service

    III. SYSTEM OPERATION AND SERVICE • Disconnecting R wire from the outdoor control R 7-Segment Alert and System Status Codes terminal. Alert codes are displayed using the 7-segment display loc­ ated on the outdoor control. • Turning the indoor unit off and back on again NOTE - System fault and lockout codes take precedence After power up, all currently displayed codes are over system status codes (cooling, heating operating per­...
  • Page 31 Lennox is enlarging the cut- that confirms this operational outs in the plate so MOV2 will clear the fixture. Corrective sequence is not sensing action completed on August 29,2013.
  • Page 32 Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 33 Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 34 Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 35 Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 36 POWER-UP / RESET: 7-SEGMENT POWER-UP DISPLAY STRING FIRMWARE VERSION: During initial power-up or reset, the first item displayed is the outdoor control firmware version. Example to the right shows firmware version 2.3. UNIT TYPE: The next item displayed is the self discovery unit type.
  • Page 37 Table 7. Outdoor Control 7-Segment Unit Status Displays Description Example of Display Idle Mode: Decimal point flashes at 1 Hz (0.5 second on, 0.5 second off). Idle Mode: Decimal point flashes at 1 Hz. Display OFF. Soft Disable Mode: Top and bottom horizontal line and decimal point flash at 1 Hz.

  • Page 38: Outdoor Control Push-Button Operation

    PUSH − BUTTON OPERATION Outdoor control must be in IDLE mode (no heating or Allows field access to Diagnostic, Fan, Defrost and Error Code Re­ cooling operation). call modes. NOTE - See table 6 for explanation of codes. Push and hold button until mode To enter mode options, push and hold button next to 7­seg­...

  • Page 39: Diagnostic Mode

    Idle mode — System is energized with no demand — Decimal flashes at 1 Hertz > 0.5 second ON, 0.5 second OFF. Display Symbol or Display Fan Test and Display String Option Character Displayed Display string shows outdoor control firmware version 1 _ 6 > pause> A C or H P unit >pause>unit capacity in BTUs>pause >unit code. If 3 during start-up horizontal bars are displayed during any sequence of this display string, it indicates that the specific parameter is not configured.
  • Page 40 6. Monitor the low-side pressure at the outdoor unit. The internal vacuum protection in the compressor and/or one of the pressure switches prevents full recovery of the refrigerant into the outdoor unit. When the system reaches this condition, the suction line service valve PUMP DOWN PUMP DOWN should be shut off and the Pump-Down Jumper...
  • Page 41 How to enable liquid line temperature information on a 7-segment display NOTE - If system power is recycled, display string reverts back to Both coil and liquid line temperatures can be enabled for display default. Repeat the procedure which enables the outdoor coil and either during normal demand operation or while in idle mode.

  • Page 42: Configuring Unit

    Configuring Unit When installing a replacement outdoor control, the unit selection code may have to be manually assigned using the 7-seg­ ment display and push button on the control. The unit code sets unit type, capacity and outdoor fan RPM. Configuring Unit Selection Code Power-up - Unit selection code (two-digit number) displayed represents unit size code (outdoor unit capacity).

  • Page 43: Reconfiguring Outdoor Control Using Icomfort Wi-Fi ® Or Icomfort S30 Thermostat

    Compressor anti-short-cycle delay timer status Reconfiguring Outdoor Control using ® Cooling rate iComfort Wi-Fi or iComfort S30 Compressor shift delay timer status Thermostat High pressure switch status If any component of the HVAC system is changed, e.g. re­ Low pressure switch status placing an outdoor sensor, reconfiguring the system is required.

  • Page 44: Maintenance

    Maintenance 1. Clean or change filters. Outdoor Unit 2. Lennox blower motors are factory-lubricated and per­ Maintenance and service must be performed by a qualified manently sealed. No more lubrication is needed. installer or service agency. At the beginning of each cooling 3.

  • Page 45: Unit Wiring Diagrams

    Unit Wiring Diagrams Figure 22. Typical Unit Wiring (XC20-024 and -036) XC20...
  • Page 46 Figure 23. Typical Unit Wiring (XC20-048 and -060) XC20...
  • Page 47 XC20 or XP20 iComfort Outdoor Unit Wiring Detail with Utility Load Shedding XC20 OUTDOOR CONTROL NOTE - For more information on Load-Shedding feature, see Electrical on page 24. Figure 24. Load-Shedding Feature Wiring Diagram XC20...

  • Page 48: Factory Wiring Diagrams

    Factory Wiring Diagrams Figure 25. Typical Factory Wiring (XC20-024 and -036) XC20...
  • Page 49 Figure 26. Typical Factory Wiring (XC20-048 and -060) XC20...

  • Page 50: Unit Sequence Of Operations

    Unit Sequence of Operation The following figures illustrate the overall unit sequence of operation along with the operation of various pressure switches and temperature sensors. The figures also illustrate the use of the compressor anti-short-cycle function in relation to unit Status, unit Fault and lockout LED Codes and unit system operation interactions.
  • Page 51 INITIAL TRIP PRESSURE SWITCH IS CONTACTOR Y1 DEMAND CLOSED SWITCH (S87) IGNORED FOR ENERGIZED 90 SECONDS SWITCH IS CLOSED OR OUTDOOR PRESSURE CLOSED OPEN AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized.
  • Page 52 HIGH TOP CAP PRESSURE CONTACTOR CLOSED Y1 DEMAND CLOSED SWITCH (S173) SWITCH (S4) ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized. If demand is satisfied when alarm is not active, the OPEN 5-strike counter resets.

  • Page 53: Component Testing

    Component Testing Component Testing Table of Contents Verifying High Pressure and Low Pressure Switch Oper­ Line Filter (Electromagnetic Compatibility Circuit - EMC) ation ......... Operations, Checkout and Status / Error Codes .
  • Page 54 INITIAL TRIP PRESSURE CONTACTOR SWITCH IS Y1 DEMAND CLOSED SWITCH (S87) ENERGIZED IGNORED FOR 90 SECONDS SWITCH IS CLOSED OR OUTDOOR PRESSURE CLOSED OPEN AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW CONTACTOR 1. The thermostat will terminate demand when the contactor is DE-ENERGIZED de-energized.
  • Page 55 HIGH TOP CAP CONTACTOR PRESSURE CLOSED CLOSED Y1 DEMAND SWITCH (S173) ENERGIZED SWITCH (S4) HIGH PRESSURE CLOSED OPEN SWITCH (S4) CONTACTOR DE-ENERGIZED 1. The thermostat will terminate demand when the contactor is de-energized. If demand is satisfied when alarm is not active, the 5-strike counter will reset.

  • Page 56: Ation

    High and Low Pressure Switch Errors Table 10. Outdoor Control 7-Segment Display Alert Codes - High and Low Pressure Switches System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 57 STATUS CODES: When the compressor is running, the 7­segment display on the outdoor control sends the current compressor demand (as a percentage) to the room thermostat. (Example: C 5 0 – compressor is running at 50% of maximum speed.) Figure 34. Compressor Operation, Checkout and Status/Error Codes ERROR CODES: Table 11.
  • Page 58 Table 11. Outdoor Control 7-Segment Display Alert Codes - Compressor System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...

  • Page 59: Crankcase Heater, Checkout And Status / Error Codes

    Crankcase Heater, Checkout and Status / Error Codes OPERATION: CRANKCASE HEATER (HR1) Compressors in all units are equipped with a 40 watt belly-band type crankcase heater. The heater prevents liquid from accumulating in the compressor. The heater is controlled by the crankcase heater thermostat. CRANKCASE HEATER THERMOSTAT (S40) Crankcase heater thermostat S40 controls the crankcase heater in all units and is located on the liquid line (see figure 2 for location).

  • Page 60: Compressor Sound Cover

    Figure 37. Checking Crankcase Heater Thermostat STATUS CODE: None ERROR CODES: None Compressor Sound Cover All units come with a soft-sided polyethylene molded outer shell compressor sound cover. The cover helps reduce any un­ wanted operating sounds from the compressor. The cover features a hook/loop closure system for ease of installation on the compressor.

  • Page 61: Top Cap Switch Operation, Checkout And Status / Error Codes

    Top Cap Switch Operation, Checkout and Status / Error Codes OPERATION: Top Cap Thermal Sensor Switch (S173) Some units are equipped with a compressor-mounted normally closed temperature switch that prevents compressor dam­ age due to overheating caused by internal friction. The switch is located on top of the compressor casing. This switch senses the compressor casing temperature and opens at 239-257°F to shut off compressor operation.

  • Page 62: Reactor Operations, Checkout And Status / Error Codes

    ERROR: Table 12. Outdoor Control 7-Segment Display Alert Codes - Top Cap Switch NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...

  • Page 63: Line Filter (Electromagnetic Compatibility Circuit - Emc) Operations, Checkout And Status / Error Codes

    Line Filter (Electromagnetic Compatibility Circuit - EMC) Operations, Checkout and Status / Error Codes OPERATION: The line filter reduces the unintentional conducted emission from the equipment, to a level sufficient to pass regulatory limits (such as FCC part 15). The filter is rated at 208/230 volt, 30 amp maximum, 60 Hertz. NOTE - The 2- and 3-ton inverters have the EMC built­in.

  • Page 64: Outdoor Fan Operation And Checkout

    Outdoor Fan Operation and Checkout OPERATION: hese units use an integrated control and motor that is programmed for variable-capacity operation. The fan speed is ® ® controlled by the iComfort Wi-Fi or iComfort S30 thermostat. CHECKOUT: VAC Voltage Check Check for 208/240 VAC power at inverter contactor (red wires) (see figure 45). With unit operating, check for main VAC to motor and outdoor control VDC output to motor: 1.

  • Page 65: Ferrites

    VDC Voltage Check: Check for VDC out of Fan PWM and COM. VDC output reading is determined by the percentage of room thermostat de­ mand. 1. No voltage present – Remove wires from control and check for VDC. If there is no voltage present, then replace out­ door control.

  • Page 66: Outdoor Control Operation, Checkout And Status / Error Codes

    Outdoor Control Operation, Checkout and Status / Error Codes OPERATION: The outdoor control is a microprocessor-based device for use with variable-capacity compressors up to 5-tons in capacity operating on 24VAC residential power. The outdoor control integrates the functionality of maintaining compressor speed, demand, defrost and fan PWM controls.

  • Page 67: Unit Sensor Operations, Checkout And Status / Error Codes

    ERROR CODES: Table 14. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 68 PIN# / WIRE RESISTANCE VALUES TEMP RANGE ºF SENSOR SLEEVE COLOR RANGE (OHMS) (ºC) NONE 6 AND 5 314669 and 3779 OUTDOOR 336,000 to 2,487 (see 4 AND 3 AMBIENT -40 (-40) TO table 15 on page 69 for (BLACK) 140 (60) exact temperature to 2 AND 1...
  • Page 69 Table 15. Ambient and Liquid Line Sensors Temperature / Resistance Range Degrees Fahr­ Degrees Fahr­ Degrees Fahr­ Degrees Fahr­ Resistance Resistance Resistance Resistance enheit enheit enheit enheit 136.3 2680 56.8 16657 21.6 44154 -11.3 123152 133.1 2859 56.0 16973 21.0 44851 -11.9 125787...

  • Page 70: Dc Inverter Control Operation, Checkout And Status / Error Codes

    ERROR C C O C ODES: Table 16. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes ®...
  • Page 71 Heat Sink Intelligent Power Module Converter Power Factor Correction Circuit Communication Control Figure 52. 4- and 5-Ton Unit Inverter STATUS CODES: Table 17. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/de­ humidification).
  • Page 72 Table 18. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 73 Table 18. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
  • Page 74 Table 18. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...

  • Page 75: System Refrigerant

    Emergency 24VAC System Operation The Y terminal located on the outdoor control allows the outdoor unit to be cycled ON and OFF using 24VAC inputs. The outdoor unit will operate at 100% capacity in this configuration. The following wiring diagrams display the wiring changes needed to switch a full communicating system to a non-communic­ ating system with the XC20 running in emergency mode (24VAC inputs to outdoor unit).
  • Page 76 MANIFOLD GAUGE SET HIGH GAUGE SET OUTDOOR UNIT CONNECTIONS FOR TESTING AND CHARGING REFRIGERANT TANK CHARGE IN LIQUID PHASE SUCTION LINE DIGITAL SCALE TO LIQUID TEMPERATURE SENSOR LINE SERVICE (LIQUID LINE) PORT TEMPERATURE SENSOR CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF HFC-410A SET FOR LIQUID PHASE CHARGING. CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE SUCTION LINE SERVICE PORT.
  • Page 77 Use the WEIGH-IN method for adding initial refrigerant charge, and then use SUBCOOLING method for for verifying refrigerant charge. WEIGH-IN CHARGING METHOD NOTE - Insulate liquid line when it is routed through areas where 64ºF (17.7ºC) and Below the surrounding ambient temperature could become higher than Adjust amount for variation in the temperature of the liquid line or when pressure drop is equal line set length and liquid line...
  • Page 78 XC20 — HFC-410A CHARGING INFORMATION FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION AND SERVICE PROCEDURE (CORP 1407-L10). 1. Record outdoor ambient temperature using a digital thermometer. IMPORTANT ! 2. Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize.

This manual is also suitable for:

Xc20-060-230-01Xc20-024-230-01Xc20-048-230-01

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