Lennox 14HPX-036-230-17 Installation And Service Procedure
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Lennox 14HPX-036-230-17 Installation And Service Procedure

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Service Literature
LOUVERED
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
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury or
death.
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
INSTALLATION AND SERVICE
NON-LOUVERED
Unit
must
be
grounded
PROCEDURE
Corp. 0719-L5
Revised April, 2017

TABLE OF CONTENTS

Removing and Installing Louvers
Electrical Connections
System Operation (14HPX-XXX-230-01 through -016)26
Maintenance
The Merit
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
14HPX Product Specification bulletin (EHB) for approved
indoor component matchups.
This outdoor unit is designed for use in systems that use the
following refrigerant metering device:
S
Check thermal expansion valve (CTXV)
in
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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Summary of Contents for Lennox 14HPX-036-230-17

  • Page 1: Table Of Contents

    Lennox Product Specification bulletin. Coils HFC-410A refrigerant only. This unit must be installed with previously charged with HCFC-22 must be flushed. an approved indoor air handler or coil. See the Lennox 14HPX Product Specification bulletin (EHB) for approved indoor component matchups.

  • Page 2: Model Number Identification

    Model Number Identification HP X − − − Minor Revision Number Nominal SEER Voltage 230 = 208/230V-1phase-60hz Unit Type HP = Heat Pump Cooling Capacity - Tons Refrigerant 018 = 1.5 X = R-410A 024 = 2 030 = 2.5 036 = 3 042 = 3.5 048 = 4...
  • Page 3 Diameter - inches. (dB) Charge 14HPX-036-230-01, -10, -11, -12 9 lbs. 12 oz. 14HPX-036-230-17 9 lbs. 12 oz. 14HPX-036-230-18 9 lbs. 12 oz. or 9 lbs. 6 oz. Tested according to AHRI Standard 270-2008 test conditions. Refrigerant charge sufficient for 15 feet of line set.

  • Page 4: Electrical Data

    Electrical Data 208/230V-60 Hz-1 Ph Unit Compressor Condenser Fan Maximum Rated Locked Locked Over- Minimum Full Load Model Number Label Rev. Nominal Load Rotor Rotor current Circuity Amps Motor HP Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 12.3 8.97 48.0...
  • Page 5 14HPX-036-230-01 19.4 14.1 77.0 14HPX-036-230-10 19.4 14.1 77.0 14HPX-036-230-11 19.4 14.1 77.0 14HPX-036-230-12 19.4 14.1 77.0 14HPX-036-230-17 1.0 & 2.0 18.7 14.08 77.0 1.87 18.7 14.08 77.0 1.87 14HPX-036-230-18 18.7 14.1 77.0 1.87 HACR type circuit breaker or fuse. Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
  • Page 6 208/230V-60 Hz-1 Ph Unit Compressor Condenser Fan Maximum Rated Locked Locked Over- Minimum Full Load Model Number Label Rev. Load Rotor Nominal Rotor current Circuity Motor HP Amps Amps Amps Amps Protection Ampacity (FLA) (RLA) (LRA) (LRA) (amps) 1.0, 2.0, 14HPX-048-230-01 29.0 21.79...

  • Page 7: Unit Dimensions

    Unit Dimensions - inches (mm) DISCHARGE AIR OUTDOOR COIL FAN COMPRESSOR SUCTION AND LIQUID LINE CONNECTION OPTIONAL UNIT STANDOFF KIT (4) (FIELD INSTALLED) SIDE VIEW SIDE VIEW Table 1. Unit Dimensions (14HPX-XXX-230-01 through -012) Model Number 14HPX-018-230 24-1/4 (616) 29-1/4 (743) 28-1/2 (724) 14HPX-024-230 24-1/4 (616)

  • Page 8: Typical Unit Parts Arrangement

    Typical Unit Parts Arrangement CONTROL NOTE — PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY BETWEEN MODEL SIZES. COMPRESSOR COMPRESS0R CAPACITOR HARNESS CONTACTOR DISCHARGE LINE DEFROST GROUND DEFROST THERMOSTAT MUFFLER CONTROL BOARD LOW PRESSURE CHECK EXPANSION SWITCH VALVE REVERSING VALVE EQUALIZER LINE BI-FLOW FILTER DRIER...

  • Page 9: General Information

    THERMAL CONTROL PROTECTION SWITCH (S173) (ONLY ON UNITS USING DUAL RUN EXTERNAL SWITCH) COMPRESS0R CAPACITOR (C12) SWITCH COVER CONTACTOR COMPRESSOR HARNESS (K-1) DISCHARGE LINE GROUND MUFFLER DEFROST THERMOSTAT LOW PRESSURE (S6) SWITCH (S87) CHECK / EXPANSION VALVE REVERSING VALVE (L1) DEFROST EQUALIZER LINE CONTROL...
  • Page 10 0 - 800 psig on the high side and a low side See the Lennox Service and Application Notes #C-08-1 of 30” vacuum to 250 psig with dampened speed to 500 psi. for further details and information.
  • Page 11 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 12: Unit Placement

    See NOTES NOTES: Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box. Clearance to one of the other three sides must be 36 in. (914 mm) Clearance to one of the remaining two sides may be 12 in. (305 NOTES NOTES mm) and the final side may be 6 in.
  • Page 13 PLACING UNIT ON SLAB least the same height and width as outdoor unit. Mount barrier 24 inches (610 mm) from the sides of the unit in the When installing unit at grade level, the top of the slab should direction of prevailing winds. be high enough above grade so that water from higher ground will not collect around the unit.
  • Page 14 Removing and Installing Louvered Panels – Later Builds WARNING To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following: While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).

  • Page 15: New Or Replacement Line Set

    (braze connections) to the indoor unit prior to the installation of the 14HPX unit. Typically a liquid coil (flare or braze connections). Use Lennox L15 (braze, line used to meter flow is 1/4” in diameter and copper.
  • Page 16 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 17: Brazing Connections

    Brazing Connections IMPORTANT Use the procedures outline in figures 9 and 10 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 valve. WARNING Danger of fire.
  • Page 18 CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line.
  • Page 19 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 20: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...

  • Page 21: Installing Indoor Metering Device

    See the Lennox 14HPX Product Specification bulletin for expansion valve. Refer to below illustration for reference approved expansion valve kit match-ups. The expansion during installation of expansion valve unit.

  • Page 22: Leak Test Line Set And Indoor Coil

    Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. WARNING Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion Refrigerant can be harmful if it is inhaled.

  • Page 23: Evacuating Line Set And Indoor Coil

    Evacuating Line Set and Indoor Coil 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 gauge OUTDOOR set to liquid line service valve MANIFOLD...
  • Page 24 as any gas that will not condense under temperatures and IMPORTANT pressures present during operation of an air conditioning system. Non-condensables and water suction combine with Use a thermocouple or thermistor electronic vacuum refrigerant to produce substances that corrode copper gauge that is calibrated in microns.
  • Page 25 ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control panel. Connect conduit to the control panel using a proper conduit fitting. TYPICAL CONTROL WIRING CONTROL WIRING Install low voltage wiring from outdoor to indoor unit and from...

  • Page 26: Defrost System (14Hpx-Xxx-230-01 Through -016)

    DIAGNOSTIC LEDS System Operation (14HPX-XXX-230-01 The state (Off, On, Flashing) of two LEDs on the defrost through -012) board (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 6. IMPORTANT TEST PINS DEFROST AMBIENT TERMINATION Some scroll compressors have internal vacuum protector THERMOSTAT PIN SETTINGS PINS...
  • Page 27 AMBIENT SENSOR Figure 16. Sensor Locations DEFROST SYSTEM SENSORS Table 5. Sensor Temp. / Resistance Range Sensors connect to the defrost board through a Temperature Resistance values Pins/Wire Range °F (°C) range (ohms) Color Sensor field‐replaceable harness assembly that plugs into the board.
  • Page 28 range of the sensor, the board will not perform demand or Calibration Mode—The board is considered uncalibrated time/temperature defrost operation and will display the when power is applied to the board, after cool mode appropriate fault code. Heating and cooling operation will be operation, or if the coil temperature exceeds the termination allowed in this fault condition.
  • Page 29 TEST Placing the jumper on the field test pins allows the technician to: Clear short cycle lockout Clear five-strike fault lockout Cycle the unit in and out of defrost mode Place the unit in defrost mode to clear the coil When Y1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control's TEST pins for 2 to 5 seconds.
  • Page 30 DEFROST BOARD DIAGNOSTICS See table 6 to determine defrost board operational conditions and to diagnose cause and solution to problems. Table 6. Defrost Control Board Diagnostic LEDs Green Condition/Code Possible Cause(s) Solution Power problem No power (24V) to board terminals R & Check control transformer power (24V).

  • Page 31: Defrost System (14Hpx-Xxx-230-017)

    Thermal Protection Switch (S173) — Compressor System Operation (14HPX-XXX-230-017) Mounted Some 14HPX units are equipped with a compressor UNIT COMPONENTS mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal IMPORTANT friction. The switch is located on top of the compressor casing (see figure 1).
  • Page 32 Compressor Delay (P5) NOTE — The defrost control must have a thermostat demand for the bypass function. The defrost control has a field-selectable function to reduce occasional sounds that may occur while the unit is cycling in During a single thermostat cycle, the defrost control will lock and out of the defrost mode.
  • Page 33 1. Air Filter — Ask your Lennox dealer to show you where Indoor Unit your indoor unit's filter is located. It will be either at the 1.
  • Page 34 If power to your unit has been interrupted for several hours or more, set the room thermostat selector to the Your new Lennox heat pump has several characteristics EMERGENCY HEAT setting to obtain temporary heat that you should be aware of: without the risk of serious damage to the heat pump.

  • Page 35: Start-Up And Performance Checklist

    Start-Up and Performance Checklist Job Name Job no. Date Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage Rated Load Ampacity Compressor Outdoor Fan Maximum Fuse or Circuit Breaker Electrical Connections Tight? - Indoor Filter clean? - Supply Voltage (Unit Off) Indoor Blower RPM...

  • Page 36: Sequence Of Operations

    Sequence of Operations 14HPX UNIT DIAGRAM Figure 20. Typical Unit Wiring Diagram (14HPX-XXX-230-01 through -012) Page 36...
  • Page 37 Figure 21. Typical Unit Wiring Diagram (14HPX-XXX-230-017) Page 37 14HPX SERIES...
  • Page 38 HIGH PRESSURE SWITCH (S4) — LIQUID LINE LOW PRESSURE SWITCH (S87) — SUCTION LINE REVERSING VALVE (L1) DEFROST THERMOSTAT (S6) CRANKCASE THERMOSTAT (S40) - -036, -042, 048, AND -060 UNITS ONLY Figure 22. Typical Unit Factory Wiring (14HPX-XXX-230-017) Page 38...
  • Page 39 THERMAL SWITCH (S173) HIGH PRESSURE SWITCH (S4) — LIQUID LINE LOW PRESSURE SWITCH (S87) — SUCTION LINE GROUND WIRE REVERSING VALVE (L1) (GREEN) CRANKCASE HEATER (HR1) (-060 ONLY) DEFROST THERMOSTAT (S6) CRANKCASE THERMOSTAT (S40) - -036, -042, 048, AND -060 UNITS ONLY Figure 23.

  • Page 40: Servicing Unit Void Of Charge

    14HPX OPERATING SEQUENCE This is the sequence of operation for 14HPX series units. Servicing Units Void of Charge The sequence is outlined by numbered steps which If the outdoor unit is void of refrigerant, clean the system correspond to circled numbers on the adjacent diagram. using the procedure described below.
  • Page 41 MANIFOLD GAUGE SET GAUGE SET CONNECTIONS FOR OPTIMIZING SYSTEM CHARGE HIGH NOTE — Refrigerant tank should be turned right-side-up to deliver vapor during charge optimizing procedure. TRUE SUCTION PORT HFC-410A CONNECTION REFRIGERANT TANK CHARGE IN LIQUID PHASE TEMPERATURE SENSOR DIGITAL SCALE (LIQUID LINE) TO LIQUID LINE SERVICE VALVE...
  • Page 42 ADDING OR REMOVING REFRIGERANT This system uses HFC-410A refrigerant which operates at much higher pressures than HFC-410A. The pre-installed liquid line filter drier is approved for use with HFC-410A only. Do not replace it with components designed for use with HFC-410A. This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.
  • Page 43 WEIGH IN SUBCOOLING method for adding initial refrigerant charge, and then use method for verifying refrigerant charge. CALCULATING SYSTEM CHARGE FOR WEIGH IN 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 44 Table 8. HFC-410A Temperature — Pressure (Psig) °F °C Psig °F °C Psig -40.0 11.6 15.6 -37.2 14.9 18.3 -34.4 18.5 21.1 -31.7 22.5 23.9 -28.9 26.9 26.7 -26.1 31.7 29.4 -23.3 36.8 32.2 -20.6 42.5 35.0 -17.8 48.6 37.8 -15.0 55.2 40.6...
  • Page 45 °F (°C)* Liquid Line Pressure / Vapor Line Pressure Matchups/Charge Levels and Line Set Lengths COOLING Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels 65 (18) 226 / 140 233 / 137 238 / 138...
  • Page 46 Table 2 may be used to help perform maintenance checks. This table is not a procedure for charg­ Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for ing the system and any minor variations in the pressures may be expected due to differences in the various sizes of outdoor units.
  • Page 47 Table 2 may be used to help perform maintenance checks. This table is not a procedure for charg­ Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for ing the system and any minor variations in the pressures may be expected due to differences in the various sizes of outdoor units.
  • Page 48 Table 2 may be used to help perform maintenance checks. This table is not a procedure for charg­ Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for ing the system and any minor variations in the pressures may be expected due to differences in the various sizes of outdoor units.
  • Page 49 Maintenance checks using the Normal Operating Pressures table 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 installa­...
  • Page 50 Matchups/Charge Levels and Line Set Lengths Table 2 lists all the Lennox recommended indoor unit matchups along with the charge levels for Table 2 may be used to help perform maintenance checks. This table is not a procedure for charg­...
  • Page 51 Table 1 may be used to help perform maintenance checks. This table is not a procedure for charg­ Table 2 lists all the Lennox recommended indoor unit matches along with the charge levels for ing the system and any minor variations in the pressures may be expected due to differences in the various sizes of outdoor units.
  • Page 52 Table 1 may be used to help perform maintenance checks. This table is not a procedure for charg­ Table 2 lists all the Lennox recommended indoor unit matches along with the charge levels for ing the system and any minor variations in the pressures may be expected due to differences in the various sizes of outdoor units.

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