Page 1: Table Of Contents
Servicing Unit Delivered Void of Charge ..Lennox XP17 Product Specification Bulletin (EHB) Unit Start-Up ....... . .
Page 2: Overview
Outdoor Fan Model Number Sound Rating Number Factory Refrigerant Number of Blades Diameter - inches. (dB) Charge XP17-024-230-01, -02, -03, -04, -05 10 lbs. 0 oz. 26.2 XP17-024-230-06. -07 10 lbs. 0 oz. 26.2 XP17-024-230-08 9 lbs. 10 oz. 26.2...
Page 3: Electrical Data
Model Number Rated Load Full Load current Protection Circuity Rotor Amps Motor HP Nominal RPM Amps (RLA) Amps (FLA) (amps) Ampacity (LRA) XP17-024-230-01, -02, 18.9 13.5 58.3 -03, -04 XP17-024-230-05, -06, 20.0 13.5 58.3 -07. -08 208/230V-60 Hz-1 Ph Unit Compressor...
Page 4: Unit Dimensions
208/230V-60 Hz-1 Ph Unit Compressor Condenser Fan Maximum Over- Minimum Locked Model Number Rated Load Full Load current Protection Circuity Rotor Amps Motor HP Nominal RPM Amps (RLA) Amps (FLA) (amps) Ampacity (LRA) XP17-060-230-01, -02, -03, -04, -05, -06, -07, 35.0 26.4 134.0...
Page 5: Typical Unit Parts Arrangement
Typical Unit Parts Arrangement SECOND GROUND LUG FOR SOURCESOURCEt FAN MOTOR CONTROL (A177) GROUND LUG WIRE TIE CONTACTOR-1POLE (K1-1) HIGH VOLTAGE FIELD CONNECTIONS SLEEVE OUTDOOR AMBIENT TEMPERATURE SENSOR (RT13) CAPACITOR (C12) HEAT PUMP CONTROL BOX CONTROL (A175) EXTERNAL SURGE PROTECTION USED ON XP17-XXX-230-01 AND -02 ONLY).
Page 6: Operating Gauge Set And Service Valves
Lennox Industries Inc. See the Lennox Service and Application Notes #C-08-1 P.O. Box 799900 for further details and information. Dallas, TX 75379-9900...
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. System Operation And Service
II. SYSTEM OPERATION AND SERVICE Jumpers, Loops and Terminals (101797-XX) HEAT PUMP CONTROL — ONE STAGE DS11 and DS14 LED ALERT CODES SECOND DELAY COMPRESSOR SHIFT DELAY SECOND DELAY FIELD TEST DS13 and DS15 LED ALERT CODES DEGREE TARGET DEGREE TARGET DEGREE TARGET...
Page 9 Table 2. Heat Pump Control (A175) Jumper and Terminal Descriptions Board 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 10: System Operations
COMPRESSOR PROTECTION — FIVE-STRIKE System Operations LOCKOUT SAFETY FUNCTION The five-strike lockout safety function is designed to IMPORTANT protect the unit's compressor from damage. The five-strike feature is used for high pressure (S4) and low (S87) Some scroll compressor have internal vacuum protector pressure switch trips and W input fault or miswire.
Page 11 UNIT SENSORS Table 3. Sensor Temperature / Resistance Range Sensors connect to the heat pump control through a Temperature Resistance values Pins/Wire Sensor Range °F (°C) range (ohms) Color field‐replaceable harness assembly that plugs into the control. Through the sensors, the heat pump control Outdoor 3 and 4 detects outdoor ambient and coil temperature fault...
Page 12 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 13 Table 4. RT13 Ambient and RT21 Coil 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 14: 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 using various LEDs located on codes do not provide safety protection. The is a the heat pump control (A175). See figure 3 for locations of monitoring function only and cannot control or shut down heat pump control LEDs.
Page 15 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 16 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 17 Heat Pump Control iComfortt iComfortt LEDs Clearing Sta Clearing Sta -enabled -enabled Possible Possible Condition Condition Solution Solution Cause(s) Cause(s) Thermostat Thermostat DS15 DS13 Yellow Display Display Low refrigerant charge. Evaporator blower is not running. Check blower relay coil and contacts Check blower motor capacitor Check blower motor for failure or blockage Check evaporator blower wiring and connec...
Page 18 Heat Pump Control iComfortt iComfortt LEDs Clearing Sta Clearing Sta -enabled -enabled Possible Possible Condition Condition Solution Solution Cause(s) Cause(s) Thermostat Thermostat DS15 DS13 Yellow Display Display Outdoor unit power disconnect is open. Unit circuit breaker or fuse(s) is open. Unit contactor has failed to close.
Page 19: Component Field Configuration And Troubleshooting
Verifying Correct DC Output Voltage (J2) Component Field Configuration and The following three methods can be used to determine Troubleshooting whether the fan motor (B4) is operating at the correct RPMs based on unit size. FAN MOTOR CONTROL (A177) 1. Use the information provided in table 8 to verify that all This section provides procedures for testing the fan four jumper terminals are set correctly for the specific control.
Page 20 Table 8. One Stage — Fan Motor Control RPM Jumper Settings, LED RPM Indicator and P2 DC Voltage Outputs CFM Profile Pin Select ECM1/Y1 Model LED Code* (J2) DC Volt XP17-024 12.7 XP17-030 14.3 XP17-036, -042 19.2 XP17-048, -060 21.6 * LED Code indicates fan motor control LED flash sequence.
Page 21 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 8 FOR OPTIMAL DC VOLTAGE BASED ON CFM PROFILE USED. FAN PWM OUT GREEN GREEN...
Page 22: Control Box
CONTROL BOX FAN MOTOR CONTROL (A177) — PULSE-WIDTH MODULATION (PWM) INPUT VOLTAGES DURING DEMAND ECM/Y1 ONLY - 24VDC YELLOW WIRE HEAT PUMP BLUE WIRE CONTROL (A175) BLACK WIRE ONE YELLOW WIRE FROM PS (E24) TERMINAL ON HEAT PUMP CONTROL (A175) AND SECOND YELLOW WIRES ON PIGGYBACK EXT PWR/R (24VAC INPUT TERMINALS GOES TO S4 HIGH PRESSURE SWITCH.
Page 23 Fan Motor (B4) 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 TEST This is a test that will verify that the motor does operate. 1.
Page 24 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 25 HEAT PUMP CONTROL (A175) UNIT NOMINAL capacity mismatch error code, or error code 34, must CAPACITY CODE CONFIGURATION program unit capacity for outdoor unit. Use the procedure In a communicating system, if the room thermostat is provided in figure 13 to set the unit nominal capacity code. indicating either a error code 313, indoor and outdoor unit FINISH START...
Page 26: Jumpers And Links (103369-01 And -02)
MAIN CONTROL. All unit setting changes must be done at the compressor has been OFF for 25 to 30 minutes. This MAIN CONTROL. The Lennox ComfortSense 7000 thermostat option is to help reduce the potential for ice build up on the may be used, as well as other non-communicating electronic-only thermostats.
Page 27: Jumpers And Links (103369-03)
Jumper and Links (103369-03) J4 - COMPRESSOR J3 - DEFROST AUTO PUSH BUTTON 7-SEGMENT DISPLAY SHIFT DELAY (HEAT PUMP ONLY) JUMPER ON PINS 1 AND 2 DEFROST AUTO ENABLED SECOND DELAY (DEFAULT) JUMPER ON PINS 2 AND 3 DEFROST AUTO DISABLED (DEFAULT) J1 - DEFROST TERMINATION SECOND DELAY TEMPERATURE...
Page 28: 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 29 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 30 Configuring Unit Capacity or Fan Profile OUTDOOR CONTROL Power-up - Unit capacity (two-digit number) and displayed SEVEN-SEGMENT represents unit size code (outdoor unit capacity). DISPLAY During initial power up, the number of stages / unit type, unit capacity and outdoor fan speed will appear on the 7-segment PUSH BUTTON display.
Page 31: 7-Segment Alert And System Status Codes
Table 11. Fan RPM Profiles Fan RPM Model Number Stage 1 Stage 1 Stage 2 Stage 2 EDA Stage EDA Stage Profile Pulse Width Revolutions Pulse Width Revolutions Pulse Width Revolutions Modulation Per Minutes Modulation Per Minutes Modulation Per Minutes Percentage Percentage Percentage...
Page 32 Table 12. Seven-Segment Display Alert Codes NOTE — System fault and lockout seven-segment display alarm codes takes precedence over system status codes (cooling, heating stages or defrost/dehumidification). Only the latest active fault or lockout alarm code if present will be displayed.
Page 33 Table 13. 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. E 414 er than the recommended upper limit of Check system operating pressures and compare to unit charging charts in installation manual.
Page 34 Displays the number of the selected fan profile. 3 POWER-UP 7-SEGMENT DISPLAY STRING Power up / Reset following display of nominal capacity: Fan Profile code. (a single or two digit number) See table 11 for applicable fan RPM pro file. Unit Type / Stages Capacity Fan Profile...
Page 35 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 36 Table 15. 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 37: Reconfiguring Outdoor Control Using Icomfortt
Indoor Unit 1. Clean and inspect outdoor coil (may be flushed with a 1. Clean or change filters. water hose). Ensure power is off before cleaning. 2. Lennox blower motors prelubricated 2. Outdoor unit fan motor is pre-lubricated and sealed. No permanently sealed.
Page 38: Sunsource ® Home Energy System
Heavy snow and/or freezing rain can interfere with the time of installation or in the future. performance of the outdoor fan assembly. Lennox recommends use of the optional snow guard (X8782) in Solar energy is first used to meet cooling/heating these areas.
Page 39 5. Install discharge grommet. 6. Install top caps. 7. Fasten new top cable tie. Cable ties are not reusable. Order Cable Tie Kit, Lennox Catalog Number 8. Fasten new middle cable tie. 17W77. Kit will included the following three cable ties: 1.
Page 40: Start-Up And Performance Checklist
XP17 Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Solar Module Mfg. and Model Serial Notes: START-UP CHECKS Refrigerant Type: Rated Load Amps Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Vapor Pressure:...
Page 41: 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 42 Figure 19. Typical XP17 Wiring (Non-Communicating, Surge Protection and A177 Fan Motor Control Wiring Change) (XP17-XXX-230-02) Page 42 XP17...
Page 43 Figure 20. Typical XP17 Wiring (Communicating, No Surge Protection and A177 Fan Motor Control Wiring Change) (XP17-XXX-230-02 through -05) Page 43 XP17...
Page 44 Figure 21. Typical XP17 Wiring (XP17-XX-230-06) Page 44 XP17...
Page 45: Factory Wiring Diagrams
Factory Wiring Diagrams Figure 22. Typical Factory Wiring (XP17-XX-230-01) Page 45 XP17...
Page 46 Figure 23. Typical Factory Wiring (XP17-XX-230-02) Page 46 XP17...
Page 47 Figure 24. Typical Factory Wiring (XP17-XX-230-03 and -05) Page 47 XP17...
Page 48 Figure 25. Typical Factory Wiring (XP17-XX-230-06) Page 48 XP17...
Page 49: Load Shed Wiring
Figure 26. Preferred Method - Outdoor Controls - 101796-xx, 101797-xx, 101798-xx, 101799-xx, 103369-01 and 103369-02) Information in this note shows the proper application and PREFERRED WIRING (OUTDOOR CONTROL - 103369-03) interface wiring of utility load control devices to Lennox iComfort™-enabled outdoor units installed 1.
Page 50 XC21 iComfort™ Outdoor Unit Wiring Detail with Utility Load Shedding - Preferred and Only Wiring Method Outdoor Control Part Number 103369-03 Field-Provided Relay - Part Number 69J79 (silver-gold diffused contacts) (NO) (NC) Utility Load Control Receiver Contacts (N.C. contacts shown, verify contact configuration) Figure 27.
Page 51 XC21 iComfort™ Outdoor Unit Wiring Detail with Utility Load Shedding - Alternate Wiring Method NOTE: This alternate wiring method is not applicable to early production XC17, XP17, XC21 and XP21 outdoor units that used outdoor control 101796xx, 101797xx, 101798xx and 101799xx. Outdoor Control Part Numbers 103369-01 103369-02...
Page 52: Unit Sequence Of Operations
Unit Sequence of Operations The following figures illustrated the overall unit sequence of operations along with various pressure switches and temperature sensor operations. These 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. On 24VAC power-up or heat pump control (A175) reset, the heat pump control shall perform the following tasks: 1.
Page 53 INITIAL TRIP PRESSURE SWITCH IS CONTACTOR Y1 DEMAND CLOSED SWITCH (S87) IGNORED FOR ENERGIZED 90 SECONDS PRESSURE SWITCH IS CLOSED OR OUTDOOR CLOSED OPEN AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW CONTACTOR The thermostat will terminate demand when the contactor DE-ENERGIZED is de-energized.
Page 54 HIGH COMPRESSOR PRESSURE CLOSED Y1 DEMAND CONTACTOR SWITCH (S4) ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) COMPRESSOR If 5-strike counter has four or less strikes when Y1 demand CONTACTOR is terminated or satisfied, the strike counter will reset to DE-ENERGIZED zero.
Page 55 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 56 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...
Page 57: Iii. Installation
III. INSTALLATION MINIMUM CLEARANCE CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS) ABOVE UNIT 6 (152) ACCESS PANEL NOTES: CONTROL PANEL Clearance to one of the other three 48 (1219) ACCESS sides must be 36 inches (914mm). LOCATION 30 (762) 12 (305) Clearance to one of the remaining two sides may be 12 inches (305mm) and the final side may be...
Page 58 STABILIZING UNIT ON UNEVEN SURFACES NOTICE IMPORTANT Roof Damage! Unit Stabilizer Bracket Use (field-provided): This system contains both refrigerant and oil. Some Always use stabilizers when unit is raised above the rubber roofing material may absorbed oil and cause the factory height.
Page 59 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 60: Removing And Installing Panels
Removing and Installing Panels ACCESS PANEL REMOVAL PANELS Removal and reinstallation of the ac cess panel is as illustrated. ACCESS AND LOUVERED REMOVE 4 SCREWS TO REMOVE PANEL FOR WARNING ACCESSING COMPRESSOR To prevent personal injury, or damage to panels, unit or structure, be sure to ob AND CONTROLS.
Page 61: Electrical
Refer to the furnace or air handler installation instructions Electrical for additional wiring application diagrams and refer to unit In the U.S.A., wiring must conform with current local codes nameplate for minimum circuit ampacity and maximum and the current National Electric Code (NEC). In Canada, overcurrent protection size.
Page 62 ROUTE CONTROL WIRES — NON-COMMUNICATING Install low voltage control wiring from outdoor to indoor unit and from CONTROL BOX thermostat to indoor unit as illustrated. Run 24VAC control wires through hole with grommet. Make 24VAC control wire connections to heat pump control (A175). NOTE —...
Page 63: Field Control Wiring
Field Control Wiring Air Hander Control ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 One−Stage Heat Pump Control On−board link Low voltage thermostat wiring Flat metal jumper i− 1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat's outdoor temperature display (optional). ®...
Page 64 Furnace Control ComfortSense[ 7000 Thermostats Catalog # Y0349 or Y2081 One−Stage Heat Pump Control On−board link Low voltage thermostat wiring i− 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 - catalog number Y0349 only.
Page 65: New Or Replacement Line Set
This section provides information on installation or assistance. replacement of existing line set. If new or replacement line To obtain the correct information from Lennox, be sure to set is not being installed then proceed to Brazing Connections on page 67.
Page 66 LINE SET IMPORTANT — Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET — INSTALLING Line Set Isolation — The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET —...
Page 67: Brazing Connections
Brazing Connections IMPORTANT Use the procedures outline in figures 41 and 42 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 68 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 69 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 70: Flushing The System
Flushing the System TYPICAL CHECK EXPANSION VALVE FLUSHING REMOVAL PROCEDURE (Uncased Coil Shown) STUB END LINE SET AND INDOOR COIL (1 OF 2) TWO PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION TYPICAL FIXED ORIFICE REMOVAL PROCEDURE HOUSING VALVE DISTRIBUTOR...
Page 71 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 THE LENNOX XP17 PRODUCT SPECIFICATION FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION.
Page 72: 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 73: 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 SET Connect an HFC-410A manifold gauge set high pressure hose to the vapor valve service port.
Page 74: Evacuating The System
Evacuating the System Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non-condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts.
Page 75 1. Pull system down to 28 inches of mercury (711mm Hg) and allow pump to continue operating for an additional 15 minutes. 2. Close manifold valves or valve at vacuum pump and shut off vacuum pump. 3. Connect a nitrogen cylinder and regulator to system and fill with nitrogen until system pressure is 2 psig.
Page 76: Iv. System Charge
IV. SYSTEM CHARGE 2. Inspect all factory- and field-installed wiring for loose Servicing Units Delivered Void of Charge connections. If the outdoor unit is void of refrigerant, clean the system 3. After evacuation is complete, open both the liquid and using the procedure described below.
Page 77 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 78 WEIGH IN SUBCOOLING method for adding initial refrigerant charge, and then use method for for verifying 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.
Page 79 SUBCOOLING CHARGING METHOD 1. Check the airflow as illustrated in figure 48 to be sure the indoor airflow is as required. (Make any air flow adjustments before continuing with the following procedure.) 2. Measure outdoor ambient temperature; determine whether to use cooling mode or COOLING heating mode to check charge.
Page 80 Table 18 HFC-410A Temperature (°F) - Pressure (Psig) °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig 100.8 137.1 178.5 231.6 290.8 365.0 545.6 445.9 102.9 139.6 181.6 235.3 295.1 370.0 451.8 552.3 105.0 142.2 184.3...
Page 81 APPENDIX A - UNIT CHARGING STICKERS This section contains all published charging stickers for the various versions of this model. Below is a table listing the applicable sticker to unit model number. Table 19. Applicable Charging Sticker by Unit Model Number Unit Charging Sticker Numbers Unit Model Number 580287-01...
Page 82 Matchups/Charge Levels and Line Set Lengths Heating Operation Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for the various sizes of outdoor units. Charge levels on the unit nameplate are based on 20 (-7)
Page 83 Matchups/Charge Levels and Line Set Lengths Heating Operation Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for the various sizes of outdoor units. Charge levels on the unit nameplate are based on 20 (-7)

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Lennox XP17-024-230-01 Installation And Service Procedure

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