Lennox Signature XP21 Series Installation And Service Procedure
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Lennox Signature XP21 Series Installation And Service Procedure

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See also: Instruction and Installation Manual
Service Literature
Dave Lennox Signature
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfortt thermostat must be used in
communicating applications.
D In
non−communicating
®
ComfortSense
7000 thermostat may be used, as well
as other non−communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field
wiring
examples
applications begin on page 22.
See the icomfortt thermostat Quick Start Guide for
communicating and partial communicating field wiring
connections.
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
professional installer (or equivalent) or a service agency.
IMPORTANT
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.
INSTALLATION AND SERVICE
PROCEDURE
Corp. 1031−L7
Revised August 17, 2012
applications,
the
Lennox
for
non−communicating
®
Collection XP21 Series Units

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Summary of Contents for Lennox Signature XP21 Series

  • Page 1: Table Of Contents

    Evacuating the System ......D The Lennox icomfortt thermostat must be used in Electrical ........

  • Page 2: Overview

    I. OVERVIEW Model Number identification −02 P 21 XXX − − Refrigerant Type Minor Revision Number X = R−410A Voltage 230 = 208/230V−1ph−60hz Unit Type P = Heat Pump Nominal Cooling Capacity 024 = 2 tons Series 036 = 3 tons 048 = 4 tons 060 = 5 tons Typical Serial Number Identification...

  • Page 3: Electrical Data

    Electrical Data 208/230V−60 Hz−1 Ph Unit Compressor Condenser Fan Maximum Locked Over− Minimum Model Number Rated Load Nominal Nominal Full Load Rotor current Circuity Motor HP Amps (RLA) RPM 1−Stage RPM 2−Stage Amps (FLA) Amps Protection Ampacity (LRA) (amps) XP21−024−230−01, 14.9 10.3 51.0...

  • Page 4: Unit Dimensions

    Unit Dimensions −− Inches (mm) 35−1/2 DISCHARGE AIR (902) 39−1/2 (1003) ELECTRICAL INLET (HIGH VOLTAGE) 37 (940) (−024 AND −036) 47 (1194) (−048 AND −060) 4−1/2 (114) SUCTION LINE INLET ELECTRICAL INLET (CONTROL WIRING − LOW VOLTAGE) LIQUID LINE SOLAR MODULE 18−1/2 INLET WIRING...

  • Page 5: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement FAN MOTOR CONTROL (A177) PULSE−WIDTH WIRE TIE MODULATION (PWM) (ONLY ON UNITS WITH MAIN GROUND LUGS CONTROL 101796−XX) CONTACTOR−1POLE (K1−1) HIGH VOLTAGE FIELD CONNECTIONS RT13 OUTDOOR AMBIENT TEMPERATURE SENSOR HEAT PUMP CONTROL (A175) CAPACITOR (C12) FAN MOTOR SURGE PROTECTION (ONLY ON XP21−XXX−230−01 BUILD.

  • Page 6: Operating Gauge Set

    Disturbing insulation during installation, See the Lennox Service and Application Notes #C−08−1 maintenance, or repair will expose you to fiberglass wool for further details and information. dust. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to cause cancer.)

  • Page 7: 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 8: 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- tail B.
  • Page 9 STABILIZING UNIT ON UNEVEN SURFACES Install the unit a minimum of six inches (152 mm) above the roof surface to avoid ice build−up around the unit. Locate IMPORTANT the unit above a load bearing wall or area of the roof that can adequately support the unit.
  • Page 10 DETAIL A DETAIL B INSTALL UNIT AWAY FROM WINDOWS 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. BUILDING STRUCTURE MOUNTING SLAB TWO 90°...

  • Page 11: Removing And Installing Panels

    Removing and Installing Panels ACCESS PANEL REMOVAL PANELS REMOVAL AND RE−INSTALLATION OF THE ACCESS PANEL IS AS ILLUSTRATED. ACCESS AND LOUVERED REMOVE 4 SCREWS TO WARNING REMOVE PANEL FOR ACCESSING COMPRESSOR To prevent personal injury, or damage to panels, unit or structure, be AND CONTROLS.

  • Page 12: New Or Replacement Line Set

    Field refrigerant piping consists of liquid and vapor lines from the outdoor unit to the indoor unit coil (braze connec- tions). Use Lennox L15 (sweat, non−flare) series line set, or WARNING field−fabricated refrigerant line sizes as listed in table 2.
  • Page 13 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 PRESSURE DROP IS EQUAL TO OR GREATER THAN 20 PSIG.

  • Page 14: Brazing Connections

    Brazing Connections IMPORTANT Use the procedures outline in figures 8 and 9 for brazing Connect gauge set low pressure side to vapor line line set connections to service valves. service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port WARNING valve.
  • Page 15 CAP AND CORE REMOVAL PIPING PANEL REMOVAL AND PREPARING LINE 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 16 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 WARNING Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration 1.

  • Page 17: 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 (UNCASED COIL ONLY) ORIFICE EXPANSION TYPICAL EXISTING FIXED ORIFICE HOUSING VALVE DISTRIBUTOR REMOVAL PROCEDURE (UNCASED COIL TUBES...
  • Page 18 TYPICAL NEW CHECK EXPANSION VALVE INSTALLATION PROCEDURE THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE CHECK EXPANSION VALVE METERING DEVICE. SEE THE LENNOX XP21 ENGI- NEERING HANDBOOK FOR APPROVED CHECK EXPANSION VALVE KIT MATCH−UPS AND APPLICATION INFORMATION.

  • Page 19: Leak Testing The System

    Polyol ester (POE) oils are death. used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, Never use oxygen to pressurize or preventing proper heat transfer. It can also clog the purge refrigeration lines.

  • Page 20: Leak Test

    LEAK TEST LINE SET AND INDOOR COIL 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. CONNECT GAUGE CONNECT AN HFC−410A MANIFOLD GAUGE SET HIGH PRESSURE HOSE TO THE VAPOR VALVE SERVICE PORT.

  • Page 21: 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 22: Electrical

    fined as any gas that will not condense under temperatures IMPORTANT and pressures present during operation of an air condition- ing system. Non−condensables and water suction combine with refrigerant to produce substances that corrode copper Use a thermocouple or thermistor electronic vacuum piping and compressor parts.
  • Page 23 A. ROUTE CONTROL WIRES NON−COMMUNICATING INSTALL LOW VOLTAGE CONTROL WIRING FROM OUTDOOR TO INDOOR UNIT AND FROM THERMOSTAT TO INDOOR UNIT AS ILLUSTRATED. CONTROL BOX RUN 24VAC CONTROL WIRES THROUGH HOLE WITH GROMMET. MAKE 24VAC CONTROL WIRE CONNECTIONS TO HEAT PUMP CONTROL (A175) .

  • Page 24: Field Control Wiring

    Field Control Wiring The following two illustrations provide examples on how to install control wiring using a non−communicating thermostat. For examples of how to install control wiring in complete or partial communicating systems, see the icomfortt thermostat Quick Start Guide which is provided with the thermostat. Air Handler Control ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081...
  • Page 25 Furnace Control ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 XP21 Two−Stage On−board link Heat Pump Control Low voltage thermostat wiring 1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional). ® 2. R to L connection is required for this model when using the ComfortSense 7000 −...

  • Page 26: Servicing Unit Delivered Void Of Charge

    3. After evacuation is complete, open both the liquid and Servicing Units Delivered Void of Charge vapor line service valves to release the refrigerant If the outdoor unit is void of refrigerant, clean the system us- charge contained in outdoor unit into the system. ing the procedure described below.
  • Page 27 ADDING OR REMOVING REFRIGERANT Temperature rise between the return air and supply air temperatures at the indoor coil blower unit, This system uses HFC−410A refrigerant which operates at much higher pressures than HCFC−22. The pre−installed Measuring voltage supplied to the unit, liquid line filter drier is approved for use with HFC−410A Measuring amperage being drawn by the heat unit(s).
  • Page 28 WEIGH IN SUBCOOLING method for adding initial refrigerant charge, and then use method for for veri- fying refrigerant charge. WEIGH IN CHARGING METHOD CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE IF THE SYSTEM IS VOID OF REFRIGERANT, FIRST, LOCATE AND REPAIR ANY LEAKS AND THEN WEIGH IN THE REFRIGERANT CHARGE INTO THE UNIT. TO CALCULATE THE TOTAL REFRIGERANT CHARGE: ADJUST AMOUNT.

  • Page 29: Air Handler / Indoor Coil Matchups And Targeted Subcooling Values

    Air Handler / Indoor Coil Matchups and Targeted Subcooling Values Listed below are the targeted subcooling and charging val- Table 5 XP21−048−230−ALL ues for approved indoor unit air handler / coil matchups. Target SC Add Charge* This information is also listed on the unit charging sticker Model Number Heat Cool...

  • Page 30: Operating And Temperature Pressures

    Operating and Temperature Pressures (All Builds) Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Table 8.

  • Page 31: Iii. System Operation And Service

    III. SYSTEM OPERATION AND SERVICE OUTDOOR CONTROL − PART NUMBER 101796−XX Heat Pump Control (A175) Jumpers and Terminals HEAT PUMP CONTROL TWO STAGE TABLE 10 ON PAGE 32 PROVIDES ADDITIONAL INFORMATION CONCERNING JUMPERS, LINKS, AND CONNECTIONS FOR THE HEAT PUMP CONTROL.
  • Page 32 Table 10. Heat Pump Control (A175) Jumper and Terminal Descriptions Control ID Label Description PSC Fan 240 VAC output connection for outdoor fan. PSC Fan 240 VAC input connection for outdoor fan. 24VAC output for defrost auxiliary heat output. Thermostat service light connection. 24VAC thermostat input/output for second stage operation of the unit.

  • Page 33: System Status, Fault And Lockout Led Codes

    System Status, Fault and Lockout LED IMPORTANT Codes DS15 and DS13 compressor LED fault and lockout LED codes are displayed via various LEDs located on the codes do not provide safety protection. The is a heat pump control (A175). See figure 19 for location of heat monitoring function only and cannot control or shut down pump control LEDs.
  • Page 34 System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed.
  • Page 35 System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed.
  • Page 36 Table 12. Compressor Fault and Alarm LED Codes and Related icomfortt Thermostat Alert Codes NOTE See notes 1 and 2 in table below for duration of fast / slow flashes and pause. Heat Pump Control icomfortt LEDs Clearing Sta- Possible Thermostat Condition Solution...
  • Page 37 Heat Pump Control icomfortt icomfortt LEDs Clearing Sta- Clearing Sta- Possible Possible Thermostat Thermostat Condition Condition Solution Solution Cause(s) Cause(s) DS15 DS13 Display Display Yellow Compressor has Run capacitor has failed. a locked out due Clears after Low line voltage (contact utility if voltage at to run capacitor 4 flashes power reset or...

  • Page 38: Component Field Configuration And Troubleshooting

    1. Use the information provided in table 17 to verify that Component Field Configuration and all four jumper terminals are set correctly for the specif- Troubleshooting ic unit. 2. Verify that the fan motor speed / RPM indicator is dis- FAN MOTOR CONTROL (A177) playing the correct flash sequence for the specific unit This section provides procedures for testing the fan con-...
  • Page 39 Table 14. Fan Motor Control Flash and Pause Durations Flash or Pause State Duration Flash Flash Three flashes per second Slow Flash One flash per second Short Pause Two seconds of OFF time. Long Pause Five seconds of OFF time. Table 15.
  • Page 40 DEMAND BEGINS DEFAULT MISMATCHED REPLACE FAN MOTOR FAN MOTOR CONTROL BOARD LED CONTINUOUS FAST SPEED USED FLASH DEFAULT FAN REPLACE FAN MOTOR MOTOR FAILURE LED CONSTANT ON CONTROL BOARD SPEED USED FAN MOTOR LED STAGE INDICATOR: ONE STAGE ECM1/Y1 RPM SET PER ONE SLOW FLASH AND (LOW) ONLY...

  • Page 41: Control Box

    CFM Profile Pin Select FAN MOTOR CONTROL (A177) PULSE−WIDTH MODULATION (PWM) JUMPER JUMPER CONTROL BOX HEAT PUMP CONTROL (A175) VERIFY DC VOLTAGE OUTPUT USING FAN PWM OUT AND COM TERMINALS. SEE TABLE 17 FOR OPTIMAL DC VOLTAGE BASED ON CFM PROFILE USED. FAN PWM OUT GREEN GREEN...
  • Page 42 CONTROL BOX FAN MOTOR CONTROL (A177) PULSE−WIDTH MODULATION (PWM) INPUT VOLTAGES DURING DEMAND ECM/Y1 ONLY − 24VDC BOTH ECM/Y1 AND ECM/Y2 − 24VDC AT EACH INPUT ECM/Y2 ONLY − 24VDC YELLOW WIRE HEAT PUMP BLUE WIRE CONTROL (A175) BLACK WIRE ONE YELLOW WIRE FROM PS (E24) TERMINAL ON HEAT PUMP CONTROL.
  • Page 43 Fan Motor Test Procedure A simple test can be used to test the fan motor operation. A fully charged 9V battery will be required for this procedure. FAN MOTOR (B4) TEST This is a test that will verify that the motor does operate. 1.
  • Page 44 HEAT PUMP CONTROL (A175) UNIT NOMINAL CAPACITY CODE CONFIGURATION In a communicating system, if the room thermostat is indicating either a error code 313, indoor and outdoor unit capacity mismatch error code, or error code 34, must program unit capacity for outdoor unit. Use the procedure provided in figure 24 to set the unit nominal capacity code.
  • Page 45 MULTI−FUNCTION TEST PINS (E33) Placing the jumper on the field test pins (E33) using a specific sequence allows the technician to: Clear short cycle lockout Clear five−strike fault lockout Cycle the unit in and out of defrost mode Manually place the unit in defrost mode to clear the coil When Y1 is energized and 24V power is being applied to the heat pump control (A175), a test cycle can be initiated by placing a jumper on the heat pump control’s TEST pins for 2 to 5 seconds.
  • Page 46 FAN MOTOR SURGE PROTECTION (XP21−XXX−230−01 only) Surge Protector (metal oxide varistor) − A component de- signed to protect electrical devices from voltage spikes that are 3−to−4 times the normal circuit voltage (See figure 26 for illustration of component). How it works: It is essentially a batch of metallic−oxide grains separated by insulating layers.

  • Page 47: Jumper Settings

    OUTDOOR CONTROL − PART NUMBER 103369−XX Jumper Settings Communication System The Lennox icomfortt thermostat must be used in communicating applications. Refer to page 51 for fur- The jumper settings and link are default settings and ONLY control ther information. system operation if configuration settings in the icomfortt thermostat are not available.

  • Page 48: Configuring Unit

    Configuring Unit For the new outdoor control to work correctly, it MUST BE programmed for unit type (AC or HP and number of stages), unit capacity and outdoor fan profile (RPM). The new outdoor control has an auto−detection feature that will determine the unit type.
  • Page 49 Configuring Unit Type OUTDOOR CONTROL During initial power−up the control will auto−detect the unit type. The unit type is automatically determine by what is connected to Y2 OUT and/or O OUT on the control. The SEVEN−SEGMENT unit type can be permanently stored in the control’s memory by DISPLAY manually configuring the unit type using the following procedure.
  • Page 50 Configuring Unit Capacity or Fan Profile OUTDOOR CONTROL Power−up − Unit capacity (two−digit number) and displayed represents unit size code (outdoor unit capacity). During initial power up, the number of stages / unit type, unit SEVEN−SEGMENT capacity and outdoor fan speed will appear on the 7−segment DISPLAY display.

  • Page 51: Segment Alert And System Status Codes

    Table 18. Fan RPM Profiles Fan RPM Model Number Stage 1 Stage 1 Stage 2 Stage 2 EDA Stage EDA Stage Profile PWM % PWM % PWM % XC/XP17−024 XC/XP17−030 Not assigned Not assigned XC/XP17−036 and −042 Not assigned XC/XP17−048 and −060 Not assigned Not assigned Not assigned...
  • Page 52 Table 19. Seven−Segment Display Alert Codes NOTE System fault and lockout seven−segment display alarm codes takes precedence over system status codes (cool- ing, heating stages or defrost/dehumidification). Only the latest active fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status are routinely displayed.
  • Page 53 Table 20. Seven−Segment Display Alert Codes (continued) Alert Alarm Description Possible Causes and Clearing Alarm Codes The discharge line temperature is high- Discharge line temperature is > 279ºF. Confirm that the system is properly charged with refrigerant. er than the recommended upper limit of Check system operating pressures and compare to unit charging charts in installation manual.
  • Page 54 Table 8. Outdoor Control Seven−Segment Unit Status Displays (continued) Description Example of Display Idle Mode: Decimal point blinks at 1 Hz (0.5 second on, 0.5 second off). Idle Mode: Decimal point blinks at 1 Hz Display OFF. Soft Disabled: Top and bottom horizontal line and decimal point Soft Disabled: Top and bottom horizontal line and decimal point blink at 1 blink at 1 Hz.
  • Page 55 Table 22. Error Recall Menu Options Error Code Recall Mode (Note − control must be in idle mode) To enter error code recall mode, push and hold button until solid E appears, then release button. Control will display Solid up to 10 error codes stored in memory. If E000 is displayed, there are no stored error codes. To exit error code recall mode push and hold button until solid three horizontal bars appear, then release button.
  • Page 56 Configuring Outdoor Fan Speed (Note − Control must be in Idle Mode) Display Code Procedure Release push button Allows user to select outdoor fan RPM profile. IMPORTANT: New control may need to be Solid manually configured to validate outdoor unit fan RPM setting is correct for unit capacity. Refer to RPM table on unit wiring diagram.

  • Page 57: Applicable To All Versions

    Table 24 provides information concerning the electrical characteristics of both the ZPSK4 and ZPSK5 (single−phase). Table 25. Compressor Electrical Characteristics Comparison Minimum Lennox Max Fuse Circuit Compressor Copeland Model Voltage Phase LRA RLA / Ckt Bkr Capacitor Lennox Model Start Kit Part Number Ampacity XP21−024−230−01 thru −04 100504−01 ZPS20K4E−PFV 10.3 14.9 35/5 370 63W22 XP21−024−230−05...
  • Page 58 K5 COMPRESSOR MODULATING SOLENOID Standard wiring without LSOM or icomfort t control with built−in LSOM Wiring with the LSOM or icomfort t control with the built−in LSOM Figure 28. K4 Compressor Modulating Solenoid COMPRESSOR INTERNAL SOLENOID (L34) TEST Tools required PROCEDURE Refrigeration gauge set Digital volt/amp meter...
  • Page 59 7. Record all of the readings for the Y1 demand on table Figure 30.Solenoid Pins 3. Using a multi−meter set on ohms, check the ohms 8. Energize Y2 demand. valve of the solenoid coil in the compressor and compare the value to table 26. 9.
  • Page 60 Table 27. Two−Stage Modulation Compressor Field Operational Checklist Two−Stage Modulation Compressors Field Operational Checklist Expected results during Y2 demand (Toggle switch On) Unit Readings Y1 − First Stage Y2 − Second Stage COMPRESSOR Voltage Same Amperage Higher CONDENSER FAN MOTOR Amperage Same or Higher TEMPERATURE...

  • Page 61: System Overview

    Pressure Switch Event Settings System Overview The following pressures are the auto reset event value trig- gers for low and high pressure thresholds: IMPORTANT High Pressure (auto reset) − trip at 590 psig; reset at 418. Some scroll compressor have internal vacuum protector Low Pressure (auto reset) −...
  • Page 62 UNIT SENSORS W Input Fault or Miswire Sensors connect to the heat pump control through a field- In case of a W input fault or possible miswire, the system replaceable harness assembly that plugs into the control. will function as listed in the sequence of operation in figure Through the sensors, the control detects outdoor ambient, coil, and discharge temperature fault conditions.
  • Page 63 Table 29. Ambient (RT13) and Coil (RT21) Sensors Temperature / Resistance Range Degrees Degrees Degrees Degrees Resistance Resistance Resistance Resistance Fahrenheit Fahrenheit Fahrenheit Fahrenheit 136.3 2680 56.8 16657 21.6 44154 −11.3 123152 133.1 2859 56.0 16973 21.0 44851 −11.9 125787 130.1 3040 55.3...
  • Page 64 Table 30. High Discharge Sensor (RT28) Temperature / Resistance Range Degrees Degrees Degrees Degrees Resistance Resistance Resistance Resistance Fahrenheit Fahrenheit Fahrenheit Fahrenheit 303.1 186.1 1052 136.8 2656 94.5 6613 298.1 185.0 1072 136.0 2698 93.6 6739 293.4 183.9 1093 135.2 2740 92.8 6869...
  • Page 65 TOP GRILLE OR FAN MOTOR MOUNT ADJUSTMENT FOR FAN CLEARANCE Sometimes during shipping, either the fan motor mounting or top grille may become out of alignment. This may cause the fan motor blade to not clear the orifice ring. If this situation occurs, simply adjust either or both the fan motor mount or top grille positions to allow proper clearance.
  • Page 66 CRANKCASE HEATER (HR1) REVERSING VALVE (L1) Compressors in all units are equipped with a 70 watt belly- The primary components of the reversing valve are revers- band type crankcase heater. HR1 prevents liquid from ing valve, solenoid and wiring harness. accumulating in the compressor.

  • Page 67: Maintenance

    INDOOR UNIT MAINTENANCE Indoor Unit 1. Clean or change filters. 2. Lennox blower motors are prelubricated and permanent- ly sealed. No more lubrication is needed. ® This Dave Lennox Signature Collection heat pump is fac- 3.

  • Page 68: Checklists

    3. Remove control access panel. Install refrigeration Checklists gauges on unit. Attach the amp meter to the common (black wire) wire of the compressor harness. Attach STAGE COMPRESSOR CHECKOUT thermometer to discharge line as close as possible to Use this check-out procedure to verify part- and full-load the compressor.

  • Page 69: Unit Wiring Diagrams

    Unit Wiring Diagrams The following wiring diagrams were used during various stages of unit production. Service technician will need to visually inspect the unit being service to determine which wiring diagram is applicable. Quick verification can usually be made by comparing the wiring diagram located on the unit access panel to the following diagrams.
  • Page 70 Figure 36. Typical XP21 Wiring (XP21−024−230−02, −03 and −04, XP21−036−230−02 and −03, XP21−048−230−02 and −03, XP21−060−230−02 and −03) Page 70 XP21...
  • Page 71 Figure 37. Typical XP21 Wiring (XP21−024−230−05, XP21−036−230−04, XP21−048−230−04 and XP21−060−230−04) Page 71 XP21...

  • Page 72: Factory Wiring Diagrams

    Factory Wiring Diagrams Figure 38. Typical Factory Wiring (XP21−XX−230−01) Page 72 XP21...
  • Page 73 Figure 39. Typical Factory Wiring (XP21−024−230−02, −03 and −04, XP21−036−230−02 and −03, XP21−048−230−02 and −03, XP21−060−230−02 and −03) Page 73 XP21...
  • Page 74 Figure 40. Typical Factory Wiring (XP21−024−230−05, XP21−036−230−04, XP21−048−230−04, XP21−060−230−04) Page 74 XP21...

  • Page 75: Unit Sequence Of Operations

    Unit Sequence of Operations The following figures illustrated the overall unit sequence of operations along with various pressure switches and tempera- ture sensor operations. The figures also illustration the use of the compressor anti−short cycle function in relations to unit Status, Fault and Lockout LED Codes system operations interaction.
  • Page 76 On 24VAC power−up or heat pump control (A175) reset, the heat pump control shall perform the following tasks: 1. Start the anti−short cycle delay. 2. Check temperature sensor and pressure switches at the start of demand. 3. Heat pump control responds to the thermostat input after the anti−short cycle timer expires. If there is no thermostat input, control goes to standby mode.
  • Page 77 INITIAL TRIP COMPRESSOR PRESSURE SWITCH IS Y1 DEMAND CLOSED CONTACTOR SWITCH (S87) IGNORED FOR ENERGIZED 90 SECONDS PRESSURE SWITCH IS CLOSED OR OUTDOOR CLOSED OPEN AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW COMPRESSOR CONTACTOR If 5−strike counter has four or less strikes when Y1 demand DE−ENERGIZED is terminated or satisfied, the strike counter will reset to zero.
  • Page 78 HIGH COMPRESSOR PRESSURE CLOSED Y1 DEMAND CONTACTOR SWITCH (S4) ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) COMPRESSOR CONTACTOR If 5−strike counter has four or less strikes when Y1 demand DE−ENERGIZED is terminated or satisfied, the strike counter will reset to zero.
  • Page 79 If temperature is at or above 279ºF. DISCHARGE COMPRESSOR Y1 DEMAND CLOSED SENSOR CONTACTOR (RT28)* ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) COMPRESSOR CONTACTOR If 5−strike counter has four or less strikes when Y1 demand DE−ENERGIZED is terminated or satisfied, the strike counter will reset to zero.
  • Page 80 Defrost Calibration Heat pump control monitors mode of operation through outdoor ambient Coil sensor (RT21) detects temperature below 35°F {2°C} temperature (RT13), outdoor coil during either initial power−up, after loss of power or after temperature (RT21) and compressor cooling mode, a sacrificial defrost will be used to ensure there run−time to determine when a defrost is a clear coil before attempting calibration.
  • Page 81 INITIAL TRIP Y1 DEMAND SWITCH IS IGNORED FOR 90 SECONDS COMPRESSOR CONTACTOR ENERGIZED NORMAL W OUTPUT OPERATION ACTIVE) COMPRESSOR CONTACTOR DE−ENERGIZED LED ALERT COMPRESSOR CODE / OR W OUTPUT ANTI−SHORT MODERATE ACTIVE) CYCLE TIMER ALERT 418 BEGINS DISPLAYED ANTI−SHORT CYCLE TIMER COMPRESSOR ENDS ANTI−SHORT...

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