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S e r v i c e L i t e r a t u r e
The LHX180 and 240 are configure to order units (CTO)
with a wide selection of factory installed options.
Optional electric heat is field-installed. Electric heat op-
erates in single or multiple stages depending on the kW
input size. 15kW to 60 kW heat sections are available for
the LHX180 unit and 15 kW to 90 kW heat sections are
available for the LHX240.
Cooling capacities include 15 and 20 tons. The LHX180
& 240 utilize two compressors and four condenser fans.
Multi-Stage Air Volume MSAV
The VFD-driven blower will operate at lower speeds when
demand is low and increase to higher speeds when de-
mand is high.
All LHX units are designed to accept any of several differ-
ent energy management thermostat control systems with
minimum field wiring. Factory- or field-provided control op-
tions connect to the unit through Smartwire connectors.
When "plugged in" the controls become an integral part of
the unit wiring.
The CORE Lite Control System is designed to acceler-
ate equipment install and service. Standard with all Xion
rooftop units, control system integrates key technologies
that lower installation costs, drive system efficiency, and
protect your investments.
The CORE Lite Unit Controller is a microprocessor-based
controller that provides flexible control of all unit functions.
Information contained in this manual is intended for use
by qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching
four cables to the holes located in the unit base rail (two
holes at each corner). Refer to the installation instructions
for the proper rigging technique.
False ceilings or drop ceiling may be used as a return air
plenum only if the unit being installed has a Refrigerant
Detection System installed.
All maintenance staff and others working in the local area
shall be instructed on the nature of work being carried out
with work in confined spaces being avoided.
Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting
any hot work. A degree of ventilation shall continue during
the period that the work is carried out. The ventilation
should safely disperse any released refrigerant and pref-
erably expel it externally into the atmosphere.
UNIT INFORMATION
UNIT INFORMATION
Revised 01/2025
LHX180 and 240 with R454B
blower option is available.
®
100139
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LHX SERIES
15 to 20 ton
Table of Contents
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Table of Contents
Related Manuals for Lennox LHX Series
Summary of Contents for Lennox LHX Series
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Page 1: Table Of Contents
LHX SERIES UNIT INFORMATION UNIT INFORMATION 15 to 20 ton 100139 S e r v i c e L i t e r a t u r e Revised 01/2025 LHX180 and 240 with R454B The LHX180 and 240 are configure to order units (CTO) with a wide selection of factory installed options. - Page 2 CAUTION IMPORTANT As with any mechanical equipment, contact with sharp Pipe work, including piping material, pipe routing, sheet metal edges can result in personal in jury. Take and installation shall include protection from physical care while handling this equipment and wear gloves and damage in operation and service, and be in compliance protective clothing.
- Page 3 A2L Refrigerant Considerations When breaking into the refrigerant circuit to make repairs – or for any other purpose – conventional procedures shall Ensure that the work area is adequately ventilated before be used. However, for flammable refrigerants it is important breaking into the system or conducting any hot work.
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Page 4: Options / Accessories
OPT IONS / A C C ESSORIES Size Order Item Description Number COOLING SYSTEM Condensate Drain Trap 22H54 Copper 76W27 Drain Pan Overflow Switch 21Z07 BLOWER - SUPPLY AIR Blower Options MSAV Multi-Stage Air Volume Factory Motors - MSAV Multi-Stage Air Volume Belt Drive - 3 HP Factory ®... -
Page 5: Indoor Air Quality
OPT IONS / A C C ESSORIES Size Order Item Description Number INDOOR AIR QUALITY Air Filters Healthy Climate High Efficiency Air Filters MERV 8 54W67 ® 24 x 24 x 2 (Order 6 per unit) 52W40 MERV 13 MERV 16 21U42 Replacement Media Filter With Metal Mesh Frame (includes non-pleated filter media) 44N61... -
Page 6: Outdoor Air
OPT IONS / A C C ESSORIES Size Order Item Description Number ECONOMIZER High Performance Economizer (Approved for California Title 24 Building Standards AMCA Class 1A Certified) High Performance Economizer (Downflow or Horizontal) 22J18 Includes Economizer Dampers with Outdoor Air Hood Downflow Applications - Use furnished Outdoor Air Hood - Order Downflow Barometric Relief Dampers with Exhaust Hood separately Horizontal Applications - Use furnished Outdoor Air Hood - Order Horizontal Barometric Relief... -
Page 7: Roof Curbs
OPT IONS / A C C ESSORIES Size Order Item Description Number ROOF CURBS Hybrid Roof Curbs, Downflow 8 in. height 11F58 14 in. height 11F59 18 in. height 11F60 24 in. height 11F61 Adjustable Pitch Curb 14 in. height 43W26 Standard Roof Curbs, Horizontal - Requires Horizontal Return Air Panel Kit 26 in. -
Page 8: Specifications
SP ECIFICATIONS Model LHX180S5M LHX240S5M Nominal Tonnage 15 Ton 20 Ton Efficiency Type Standard Standard Blower Type MSAV MSAV ® ® Multi-Stage Multi-Stage Air Volume Air Volume Cooling Gross Cooling Capacity (Btuh) 181,000 232,000 Performance ¹ Net Cooling Capacity (Btuh) 176,000 224,000 ¹... - Page 9 Page 9...
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Page 10: Blower Data
BLO WER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Nominal Maximum Drive Kit Number RPM Range 3.45 535 - 725 3.45 710 - 965 5.75 685 - 856 5.75 850 - 1045 5.75 945 - 1185 8.63 850 - 1045 8.63 945 - 1185 8.63... - Page 11 BLOWER DATA POWER EXHAUST FAN PERFORMANCE MINIMUM AIR VOLUME REQUIRED FOR USE WITH Return Air System Static Air Volume Exhausted OPTIONAL ELECTRIC HEAT Pressure Electric Heat kW Minimum cfm in. w.g. 6000 0.00 8630 6000 0.05 8210 0.10 7725 6000 0.15 7110 6000...
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Page 12: Electrical / Electric Heat Data
ELECTRIC AL/ELECTRIC H EAT DATA 1 5 TO N Model LHX180S5M Voltage - 60Hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 24.4 11.9 (Non-Inverter) Locked Rotor Amps Compressor 2 Rated Load Amps 27.7 11.5 (Non-Inverter) - Page 13 ELECTRIC AL/ELECTRIC HEAT DATA 2 0 TO N Model LHX240S5M Voltage - 60Hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 28.5 13.5 10.7 (Non-Inverter) Locked Rotor Amps 93.7 Compressor 2 Rated Load Amps 28.5 13.5...
- Page 14 ELECTR ICAL A C CESSORIES - D ISCONNECTS 15 TON | LHX180S5 Motor HP Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V Unit Only 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 + Power Exhaust 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85...
- Page 15 ELECTRIC H EAT CAPACITIES 15 kW 30 kW 45 kW 60 kW 90 kW Volts Btuh No. of Btuh No. of Btuh No. of Btuh No. of Btuh No. of Input Input Output Stages Input Output Stages Input Output Stages Input Output Stages...
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Page 16: Unit Parts Arrangement
PARTS ARRANGEMENT INDOOR COIL OUTDOOR FANS FILTERS (SIX - 24 X 24 X 2”) BLOWERS ECONIMIZER DAMPERS (OPTIONAL) BLOWER MOTOR INDOOR COIL RDS SENSOR (BEHIND EVAPORATOR COIL) CONDENSATE DRAIN OUTDOOR COILS UNIT CONTROLLER BLOWER INVERTER COMPRESSORS DISCONNECT ELECTRIC HEAT (FACTORY - INSTALLED OPTION) (OPTIONAL) FIGURE 1... - Page 17 Components Arrangement FIGURE 3 Components Arrangement FIGURE 4 Page 17...
- Page 18 4-Terminal Block TB13 9-Power Exhaust Relay K65 & K231 (PED units) TB13 terminal block distributes line voltage power to the Power exhaust relays K65 and K231 are N.O. DPDT line voltage items in the unit. relays with a 24VAC coil. The relay are used in units equipped with the optional power exhaust dampers.
- Page 19 Relative Humidity Sensor - Optional Economizer Differential Pressure Sensor - Optional Rooftop units installed with Smart Airflow™ will have a The indoor relative humidity sensor (A91) is an analog Pressure Transducer (PT5) present in the economizer. sensor with a 0-10VDC output over a relative humidity PT5 requires 5VDC power supply (P266-5 and {P266- range of 0-100% relative humidity.
- Page 20 15-Second-Stage Power Exhaust Relay K231 15-Fuse F61 (Higher SCCR units only) (Staged-Blower units equipped with power exhaust) Fuse F61 is used on units with higher SCCR rating. F61 The second power exhaust fan is controlled by K231. provides overcurrent protection to compressor and other A133 will enable K231 only when the blower reaches 70% cooling components.
- Page 21 SIEMENS OVERLOAD RELAY BLUE RESET BUTTON IN FACTORY SET AUTO MODE (Turn clockwise to H for manual reset) GREEN TRIP INDICATOR (Flush with surface -- not tripped; Above surface -- tripped) AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate. Proper relay amp setting equals motor nameplate FLA X service factor of 1.15 X .95.
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Page 22: Refrigerant Circuits
REFRIGERANT CIRCUITS INDOOR COIL CIRCUIT 1 & 2 ARE INTERLACED CIRCUIT 1 OUTDOOR COIL CIRUIT 2 OUTDOOR COIL FIGURE 8 B-Cooling Components WARNING Units use independent cooling circuits consisting of one Electrical shock hazard. Compressor must be compressor, one condenser coil, and one evaporator coil grounded. -
Page 23: Defrost Control
2-Crankcase Heaters HR1 and HR2 5-Defrost Control All LHX units use insertion type heaters. Heater HR1 is The defrost control ensures that the heat pump outdoor installed around compressor B1 and HR2 compressor B2. coil does not ice excessively during the heating mode. The defrost control uses input from the coil and ambient sen- 3-High Pressure Switches S4 and S7 sor to initiate demand defrost cycles from the M4 Board. - Page 24 THERMISTOR LOCATION INDOOR COIL (RT46, RT47) Note - 180S units do not use bypass assemblies BLUE RT47 YELLOW RT46 RT46 / RT47 FIGURE 9 THERMISTOR LOCATION OUTDOOR COIL RT48, RT49 22J08 BLUE YELLOW RT49 RT48 FIGURE 10 Page 24...
- Page 25 10-RDS Sensors TABLE 4 - RDS Alarms Units are equipped with factory-installed RDS Sensors Alarm Alarm description RDS Sensor Location located on different points on the unit. The RDS sensors Refrigerant leak sensor fault in Indoor compartment provide the Unit Controller with continuous readings for the Indoor section (sensor #1) leaked refrigerant concentration levels and sensor health "Control/Compressor...
- Page 26 RDS SENSOR WIRING DIAGRAM REFR. LEAK REFR. LEAK SENSOR 1 SENSOR 2 MAIN CNTRL A+ B- A+ B- J386 P386 DENOTES OPTIONAL COMPONENTS AND WIRING MODEL: Units w/CORE Contr. Refr. Leak Detection VOLT: 538440-01 SUPSDS: N/A REV EC NO. DATE APVD REVISION NOTE 3 x 7...
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Page 27: Operation / Adjustment
C-Blower Compartment IMPORTANT The blower compartment is located between the evapora- Three Phase Scroll Compressor Voltage tor coil and the compressor / control section on the oppo- Phasing site side of the condenser coil. The blower assembly is ac- cessed by disconnecting the blower motor wiring (and all Three phase scroll compressors must be phased other plugs) and removing the screws on either side of the sequentially to ensure correct compressor and... - Page 28 B-Blower Access 2 - With all access panels in place, measure static pressure external to unit (from supply to return). 1 - Disconnect jack/plug connector to blower motor. Blower performance data is based on static pressure Also disconnect jack/plug connector heating limit readings taken in locations shown in FIGURE 14.
- Page 29 BLOWER ASSEMBLY - NO TENSIONER TO INCREASE CFM LOOSEN ALLEN SCREW & TO INCREASE BELT TENSION TURN PULLEY CLOCKWISE 1-Loosen four screws securing blower motor to TO DECREASE CFM sliding base. TURN PULLEY COUNTERCLOCKWISE clockwise, to move the motor downward and tighten the belt.
- Page 30 3 - Measure belt deflection force. For a used belt, the deflection force should be 5 lbs. A new belt PULLEY ALIGNMENT - WITH TENSIONER deflection force should be 7 lbs ALIGNED A force below these values indicates and under ten- TENSIONER sioned belt.
- Page 31 D-OPTIONAL ELECTRIC HEAT 3-High Temperature Limits S15 and S107 (Primary) See ELECTRICAL / ELECTRIC HEAT DATA and ELEC- S15 and S107 are SPST N.C. auto-reset thermostats lo- TRIC HEAT CAPACITIES (table of contents) for LHX to cated on the back panel of the electric heat section below EHA match-ups and electrical ratings.
- Page 32 FIGURE 20 EHA 15, 30, 45, 60 and 90 KW ELECTRIC HEAT SECTION PARTS ARRANGEMENT HEATING ELEMENTS HE1 - HE14 ELECTRIC HEAT VESTIBULE CONTROL WIRE HARNESS TRIC HEAT LIMIT S15(1 SECTION) S107(2 SECTION) FIGURE 21 Page 32...
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Page 33: Placement And Installation
TABLE 6 ELECTRIC HEAT SECTION FUSE RATING FUSE (3 each) EHA QUANTITY VOLTAGES & SIZE F3 - 1 F3 - 2 F3 - 3 F3 - 4 F3 - 5 F3 - 6 F3 - 7 F3 - 8 50 Amp 208/230V ----- -----... - Page 34 5 - If discharge pressure is high, remove refrigerant • The recovered refrigerant shall be returned to the from the system. If discharge pressure is low, add refrigerant supplier in the correct recovery cylinder, refrigerant to the system. and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and especially •...
- Page 35 B-Charge Verification - Approach Method - AHRI TABLE 7 Testing (Fin/Tube Coil) LHX180 NORMAL OPERATING PRESSURES - 581148-02 1 - 1- Using the same thermometer, compare liquid temperature to outdoor ambient temperature. Outdoor Circuit 1 Circuit 2 Approach Temperature = Liquid temperature (at Coil En- tering Air outdoor coil outlet) minus ambient temperature.
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Page 36: Start-Up Operation
IV- START-UP OPERATION V- SYSTEMS SERVICE CHECKS A-Cooling System Service Checks A-Preliminary and Seasonal Checks 1 - Make sure the unit is installed in accordance with LHX units are factory charged and require no further ad- the installation instructions and applicable codes. justment;... - Page 37 rette smoking, should be kept sufficiently far away NOTE - Intrinsically safe components must be replaced, not repaired. from the site of installation, repairing, removing and • Under no circumstances shall potential sources of disposal, during which refrigerant can possibly be ignition be used in the searching for or detection released to the surrounding space.
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Page 38: All Units
Critical Components for Refrigerant Leak Containment All Units Hinged Door Panels If the door panels, barrier, mullions and rubber Verify that the door panel liners and bracket are seals (highlighted in red) must be removed for tightly secured. These steps are critical to service, ensure they are returned to their proper containing flammable refrigerant and preventing it places before starting the unit. - Page 39 A-Filters E-Condenser Coil LHX units use six 24 X 24 X 2” fiberglass throw-away type Clean condenser coil annually with detergent or commer- filters. Filters may be accessed through the economizer / cial coil cleaner and inspect monthly during the cooling filter access door.
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Page 40: Optional Accessories
Optional supply/return transitions C1DIFF33C-1 and frames are recommended in all other applications but C1DIFF34C-1 are available for use with LHX series units not required. If the LHX units are not mounted on a flat utilizing optional C1CURB roof curbs. Transition must be... - Page 41 NOTE - Gravity exhaust dampers are required with power C1DAMP10 MANUAL OUTDOOR AIR DAMPER exhaust. The economizer is controlled by the A55 Unit Controller. The economizer will operate in one of four modes. Each mode requires a different A55 Unit Controller DIP switch setting.
- Page 42 (A173) is located below the control pan- LHX series units. An exhaust hood is furnished with the el. Wiring for the smoke detectors are shown on the tem- gravity exhaust damper.
- Page 43 N-Drain Pan Overflow Switch S149 (optional) O-Bipolar Ionizer The overflow switch is used to interrupt cooling operation The Needlepoint Bipolar Ionizer (NBPI) kit is specifically when excessive condensate collects in the drain pan. The designed for LG/LC/LH/LD/KG/KC/KH 024-300 units. The N.C.
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Page 44: Viii--Multi-Staged Blower
VIII--Multi-Staged Blower RTU MENU > SETTINGS > RTU OPTIONS > DAMPER Tap “Next” to skip tabs and complete damper position cal- A-Design Specifications ibration until “Damper Calibration Blower Speed High” tab Use the TABLE 11 to fill in test and balance values when appears. - Page 45 TABLE 11 HEATING, VENTILATION & SMOKE MINIMUM AND MAXIMUM CFM Unit Heating CFM Vent CFM Smoke CFM Model Speed Heat Code Default Default Default HP W/O EH 4500 LHX180S 6000 7200 6000 2250 7200 6000 2250 7200 15, 30, 45, 60 E, J, K, L 6000 HP W/O EH...
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Page 46: Decommissioning
IX-Decomissioning or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the de- Before carrying out this procedure, it is essential that the tector is not a potential source of ignition and is suitable technician is completely familiar with the equipment and for the refrigerant used. -
Page 47: Wiring Diagrams And Sequence Of Operation
X-Wiring Diagrams and Sequence of Operation THERMOSTAT 5 3 8 0 7 8 -0 2 A173 CT RL S M OKE DE T E CT J 250 P250 P251 J 251 YE L YE L YE L YE L YE L YE L RE D RE D... - Page 48 ECONOMIZER 5 3 8 0 7 2 -0 1 M S 7110K RANGE 2- 10 VDC NF 24- S R AF 24- S R RANGE 2- 10 VDC 1, 2 P104 P105 RT 16 J 104 J 105 P384 J 384 M AI N CT RL Model: LC,LG,LH,LD,SC,SG Series...
- Page 49 EHA - 15/90 G Voltage Page 49...
- Page 50 EHA-15/90 Y VOLTAGE Page 50...
- Page 51 SEQUENCE OF OPERATION - MSAV MULTI-STAGE AIR VOLUME ® Objective: Outline the unit functions as a result of room thermostat or zone sensor demands Given: When economizer is present, it will function as an integral part of the unit cooling system When not present, unit will function as if economizer is present but outdoor ambient is high and sensed as not suitable UNIT OPERATION WITH 2-STAGE THERMOSTAT (2 COOL AND 2 HEAT STAGES, Y1, Y2, W1, W2) SUPPLY AIR BLOWER SPEED...
- Page 52 All compressors are energized and supply air blower operates at high cooling speed DEFROST Coil Sensors (RT48 - Circuit 1 and RT49 - Circuit 2) and Ambient Sensor (RT17) provides input to the Lennox ® CORE Lite Unit Controller to initiate a defrost cycle if needed...
- Page 53 SEQUENCE OF OPERATION - MSAV MULTI-STAGE AIR VOLUME ® HEATING Thermostat or Zone Sensor W1/H1 Demand: A first-stage heating demand (W1/H1) will energize compressors 1 and 2 and the outdoor fans. NOTE – L1 & L2 reversing valves are de-energized in the heating mode. Units With Optional Electric Heat: An increased heating demand (W2/H2) will energize electric heat NOTE –...
- Page 54 538363-01 MAIN CTRL RED-BLK RED-BLK RT17 24VAC HPSW1 RED-BLK RED-BLK RT48 RT46 24VAC EVAPORATOR COIL HPSW2 FREEZE PROTECTION RED-BLK RED-BLK RT49 RT47 RT46-SENSOR, 24VAC EVAP COIL 1 RT47-SENSOR, LPSW1 EVAP COIL 2 DEFROST CONTROL 24VAC RT48-SENSOR, LPSW2 COND COIL 1 RT49-SENSOR, DENOTES OPTIONAL COMPONENTS COND COIL 2...
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