Lennox LCH Series Unit Information
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Lennox LCH Series Unit Information

Lennox LCH Series Unit Information

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Service Literature
LCH036U, 048U, 060U, and 074U are ultra high efficiency
packaged units equipped with variable speed direct drive
blowers, an inverter-driven variable speed compressor,
and a variable speed outdoor fan.
Optional electric heat is factory or field installed . Electric
heat operates in single stage depending on the kW input
size. 7.5kW through 22.5 kW heat sections are available for
the LCH unit.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub­
ject to change. Procedures outlined in this manual are pre­
sented as a recommendation only and do not supersede 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.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent) or service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent­
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or re­
claiming must be followed. Fines and/or incarcera­
tion may be levied for non-compliance.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon­
nect switch(es). Unit may have multiple
power supplies.
Corp. 1606-L11
Ultra High Efficiency LCH036U through 074U
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in­
jury. Take care while handling this equipment and
wear gloves and protective clothing.
Electrostatic discharge can affect elec­
tronic components. Take precautions to
neutralize
touching your hand and tools to metal
prior to handling the control.

Table of Contents

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Parts Arrangement
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VIII Diagrams
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Page 1
LCH SERIES
3 to 6 ton
7 to 21 kW
CAUTION
electrostatic
charge
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by

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Summary of Contents for Lennox LCH Series

  • Page 1: Table Of Contents

    LCH SERIES 3 to 6 ton Corp. 1606-L11 7 to 21 kW Service Literature Ultra High Efficiency LCH036U through 074U LCH036U, 048U, 060U, and 074U are ultra high efficiency packaged units equipped with variable speed direct drive blowers, an inverter-driven variable speed compressor, and a variable speed outdoor fan.

  • Page 2: Options & Accessories

    OPTIONS / ACCESSORIES Unit Model Catalog Item Number Number COOLING SYSTEM Condensate Drain Trap PVC - C1TRAP20AD2 76W26 Copper - C1TRAP10AD2 76W27 Drain Pan Overflow Switch E1SNSR71AD1 68W88 Service Valves Factory BLOWER - SUPPLY AIR Motors Direct Drive - 0.50 hp Factory Direct Drive - 0.75 hp Factory...

  • Page 3: Options

    OPTIONS / ACCESSORIES Unit Model Catalog Item Number Number ELECTRIC HEAT 7.5 kW 208/230V-3ph - E1EH0075AN1Y 46W31 460V-3ph - E1EH0075AN1G 46W35 15 kW 208/230V-3ph - E1EH0150AN1Y 46W32 460V-3ph - E1EH0150AN1G 46W36 22.5 kW 208/230V-3ph - E1EH0225N1Y 46W33 460V-3ph - E1EH0225N1G 46W37 SCR (Silicon Controlled Rectifier) Electric Heat Control Factory...

  • Page 4: Barometric Relief

    OPTIONS / ACCESSORIES Unit Model Catalog Item Number Number BAROMETRIC RELIEF Barometric Relief Dampers with Exhaust Hood C1DAMP50A-1- 74W38 Barometric Relief Dampers without Exhaust Hood C1DAMP50A-2- 72W89 INDOOR AIR QUALITY Air Filters Healthy Climate High Efficiency Air MERV 8 (20 x 20 x 2 in.) - C1FLTR15D-1- 54W21 ®...

  • Page 5: Specifications

    SPECIFICATIONS General Data Nominal Tonnage 3 Ton 4 Ton 5 Ton 6 Ton Model Number LCH036U4E LCH048U4E LCH060U4E LCH074U4E Efficiency Type Ultra Ultra Ultra Ultra Blower Type MSAV MSAV MSAV MSAV (Multi-Stage Air (Multi-Stage Air (Multi-Stage Air (Multi-Stage Air Volume) Volume) Volume) Volume)
  • Page 6 Page 6...
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  • Page 9: Blower Data

    BLOWER DATA FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g. Wet Indoor Coil Filters Volume Electric Heat Economizer 036, 048 060, 074 MERV 8 MERV 13 0.01 - - - 0.01 0.04 0.04 0.05 1000 0.02 0.02 0.03 0.04 0.04 0.07...

  • Page 10: Electrical /Electric Heat Data

    ELECTRICAL / ELECTRIC HEAT DATA 3 TON 3 TON Ultra EFFICIENCY (R-410A) LCH036U4E Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph Compressor Rated Load Amps Outdoor Fan Full Load Amps Motor Power Exhaust Full Load Amps (1) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower Horsepower...
  • Page 11 ELECTRICAL / ELECTRIC HEAT DATA 4 TON 4 TON ultra EFFICIENCY (R-410A) LCH048U4E Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph Compressor Rated Load Amps 13.8 Outdoor Fan Full Load Amps Motor Power Exhaust Full Load Amps (1) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower...
  • Page 12 ELECTRICAL / ELECTRIC HEAT DATA 5 TON 5 TON ultra EFFICIENCY (R-410A) LCH060U4E Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph Compressor Rated Load Amps 14.6 Outdoor Fan Full Load Amps Motor Power Exhaust Full Load Amps (1) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower...
  • Page 13 ELECTRICAL / ELECTRIC HEAT DATA 6 TON 6 TON HIGH EFFICIENCY (R-410A) LCH074U4E Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph Compressor Rated Load Amps 16.9 Locked Rotor Amps - - - - - - Outdoor Fan Full Load Amps Motor Power...

  • Page 14: Electric Heat Capacities

    ELECTRIC HEAT CAPACITIES 7.5 kW 15 kW 22.5 kW Input No of No of No of Voltage kW input Btuh Output kW input Btuh Output kW input Btuh Output Stages Stages Stages 19,200 11.2 38,200 16.9 57,700 21,500 12.6 43,000 18.9 64,500 23,500...
  • Page 15 LCH PARTS ARRANGEMENT HUMIDITROL® EVAPORATOR COIL COIL (OPTIONAL) CONDENSER FILTERS (4) 036, 048:16 X 20 X 2” 060, 072: 20 X 20 X 2” BLOWER CONDENSER ECONOMIZER COIL (OPTIONAL) CONDENSATE DRAIN BLOWER ELECTRIC HEAT MOTOR UNIT (Optional) (BELT DRIVE SHOWN) COMPRESSOR CONTROLLER FIGURE 1...

  • Page 16: I Unit Components

    I-UNIT COMPONENTS The Unit Controller provides all unit control functions, unit status information, unit diagnostics, programmable pa­ All 3 through 6 ton (7 through 21 kW) units are configure to rameters, and USB verification and profile sharing. Refer order units (CTO). The LCH unit components are shown in to the Unit Controller guide provided with the unit.
  • Page 17 2-High Pressure Switch S4 outdoor temperatures drop below 62°F. S11 opens when the liquid pressure drops below 240 ± 10 psig (1655 ± 69 The high pressure switch is an auto-reset SPST N.C. switch kPa). S11 closes when the liquid pressure rises to 450 ± 10 which opens on a pressure rise.
  • Page 18 PLUMBING AND COMPRESSOR PROTECTION COMPONENTS CONDENSER COIL EVAPORATOR COIL EXPANSION DRIER VALVE ON LIQUID INDOOR LINE BLOWER SECTION RETURN AIR SECTION HEAT SECTION COMPRESSOR 060, 074U 036, 048U FIGURE 4 Page 18...

  • Page 19: Compressor Safety Devices

    COMPRESSOR SAFETY DEVICES Temperature protection: Opens 248+9°F; Closes 168.8 +18°F Low suction pressure protection: Opens below 20 psig Prevents reverse rotation after stop and increased Cd value By-passes liquids during compression. FIGURE 5 COMPRESSOR DIAGNOSTICS Motor Winding Resistance at 77°F (+/-7%) Unit Size 0.64 0.63...
  • Page 20 7-Compressor Inverter A192 -A communication issue - check MODBUS communica- tion wire for good connections between the Unit Controller and the inverter board. WARNING An example of the Unit Controller displaying alarm 187 is shown in figure 7. See table 1 for inverter-related alarms. Electrical Hazard Inverter component wire routing is shown in figure 9.
  • Page 21 TABLE 1 INVERTER-RELATED ALARMS ALARM CODE DISPLAY MESSAGE EVENT ACTION Possible alarming values for Prodigy Alarm 187 are: 12 - High compressor input current 13 - High heat sink temperature 14 - High PFC input current Alarm might be caused by outdoor fan abnormal operation, high ambient conditions, dirty outdoor coil, INVERTER LOW LEVEL refrigerant overcharge, or a blocked heat sink.

  • Page 22: Top View

    INVERTER WIRE ROUTING TRANSFORMER A192 INVERTER 208/230V INVERTER BOARD SHOWN FILTER BOARD W V U High voltage enters the filter board here. High voltage enters the compressor here. COMPRESSOR REACTOR FIGURE 9 INVERTER HEAT SINK TOP VIEW CONDENSER SECTION HEAT SINK DIVISION PANEL BETWEEN COMPRESSOR CONTROLS /...
  • Page 23 C-Blower Compartment Note - Static pressure readings can vary if not taken where shown. Ultra high efficiency units are equipped with a variable 3- Measure the indoor blower wheel RPM. RPM can be speed, direct drive blower. The installer is able to enter the read from the A55 Unit Controller display on direct drive design-specified supply air CFM into the Unit Controller blowers.
  • Page 24 LOCATION OF STATIC PRESSURE READINGS INSTALLATIONS WITH DUCTWORK INSTALLATIONS WITH CEILING DIFFUSERS ROOFTOP UNIT ROOFTOP UNIT RETURN AIR READING LOCATION RETURN AIR READING RE­ RE­ LOCATION SUPPLY SUPPLY TURN TURN FIRST BRANCH OFF OF MAIN RUN MAIN DUCT RUN SUPPLY AIR SUPPLY AIR READING READING...

  • Page 25: Electric Heat Components

    D-ELECTRIC HEAT COMPONENTS ELECTRIC HEAT COMPONENTS Electric heat match-ups are found in the ELECTRICAL DATA tables. See table of contents. All electric heat sections consist of electric heating ele­ ments exposed directly to the air stream. See figure 12. See figure 13 for vestibule parts arrangement. S157 ELECTRIC HEAT ELEMENTS FIGURE 13...

  • Page 26: Placement And Installation

    6-Heating Elements HE1 through HE6 II-PLACEMENT AND INSTALLATION Make sure the unit is installed in accordance with the Heating elements are composed of helix wound bare installation instructions and all applicable codes. See nichrome wire exposed directly to the air stream. Three accessories section for conditions requiring use of the elements are connected in a three‐phase arrange­...
  • Page 27 B-Cooling Start up LCH036-074U Sequence of Operation Summary - Default Unit Controller Parameters Only Blower Unit Controller A55 energizes the blower motor B3 by sending a PWM signal from P259. Zone Sensor: Blower motor B3 modulates CFM between High Cool CFM and Low Cool CFM (based on the difference between the zone/room temperature and set point).
  • Page 28 Three Phase Scroll Compressor Voltage Phasing these pressures may be expected due to differences in installations. Significant differences could mean that Three phase scroll compressors must be phased se­ the system is not properly charged or that a problem quentially to ensure correct compressor and blower rota­ exists with some component in the system.

  • Page 29: Charging

    Subcooling Method CAUTION 1- Attach gauge manifold to the liquid line. With the economizer disabled, operate the unit in cooling Label all wires prior to disconnection when servicing mode at high speed using the following Unit Con­ controls. Wiring errors can cause improper and danger­ troller menu path: ous operation.
  • Page 30 CLEAN CONDENSER COIL ENDPLATE IS SECURED Remove unit top panel and condenser section access TO MULLION TOP VIEW panel. Remove screws securing coil end plate to mullion. Remove wire ties connecting coils slabs and separate slabs 3-4” (76-102mm). SUPPLY Clean coils with detergent or commercial coil cleaner. Rinse thoroughly with water and reassemble field-provided wire ties to connect coil slabs.

  • Page 31: Accessories

    VII-ACCESSORIES operating and the thermostat is sending an occupied signal to the Unit Controller. If the thermostat signal is unoccupied, The accessories section describes the application of most of the motorized damper will not open. Washable filter supplied the optional accessories which can be factory- or field-installed with the outdoor air dampers can be cleaned with water and to the LCH units.

  • Page 32: Manual Outdoor Air Damper

    Sensors MANUAL OUTDOOR AIR DAMPER Units are equipped with the following factory-installed, CEC Title 24 approved sensors: RT17 - Outside Air Temperature DAMPER RT16 - Return Air Temperature ASSEMBLY RT6 - Discharge Air Temperature See figure 21 for sensor location. LOOSEN FOUR SCREWS TO Optional field-provided sensors may be used instead of...

  • Page 33: Sensor Location

    ECONOMIZER ECONOMIZER (STANDARD ECONOMIZER SHOWN) DAMPER MOTOR UNIT SMOKE DETECTOR (WHEN EQUIPPED) A2 SENSOR (REMOTE FOR USE WITH DDC CONTROLLED UNITS) RT16 SENSOR RETURN AIR OPENING FIGURE 20 SENSOR LOCATION RT17 OUTDOOR AIR SENSOR (SECURED TO INSIDE OF CORNER MULLION) RT16 RETURN AIR SENSOR...

  • Page 34: Horizontal Airflow

    HORIZONTAL AIRFLOW DUCT TRANSITION DUCT BACK INLET OF UNIT SUPPLY DO NOT ATTACH RETURN AIR DUCTWORK HERE OPTIONAL GED RETURN DAMPER AND HOOD FIGURE 22 TABLE 11 ECONOMIZER MODES AND SETPOINT Free Free Field- ° Permitted Dampers will modulate to 55 F discharge air (RT6) when outdoor Cooling Cooling...
  • Page 35 Outdoor Air Damper and Economizer Operation DIRECT DRIVE DRIVE SYSTEM OPERATION: Note: Direct drive units feature ECM condenser fans that are staged to match the compressor's capacity. When the compres­ sor is operating at first stage, the condenser fan is operating at low speed. The condenser fan switches to high speed when the compressor switches to second stage to match operation.

  • Page 36: Power Exhaust Fan

    F-Power Exhaust Relay K65 Refer closely to UVC light installation instruction warnings when servicing units. (power exhaust units) Power exhaust relay K65 is a DPDT relay with a 24VAC I-Smoke Detectors A171 and A172 coil. K65 is used in all LCH units equipped with the op­ Photoelectric smoke detectors are a factory- or field-in­...
  • Page 37 L-Indoor Air Quality (CO ) Sensor A63 Solar energy is first used to meet cooling/heating demands. When the unit is not operating, the system powers lighting, The indoor air quality sensor monitors CO levels and re­ appliances and other electronic devices in the building. Any ports the levels to the Unit Controller.
  • Page 38 VIII-Wiring Diagrams and Sequence of Operation Page 38...
  • Page 39 Cooling Sequence of Operation Using input from a room/zone sensor only. See Cooling Start-Up section opera­ tion summary for thermostat and third-party control operation. Power: 1. Line voltage from the unit disconnect, terminal block, or circuit breaker energizes transformer T1. T1 provides 24VAC power to the A55 Unit Controller.
  • Page 40 SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT 1 SWITCH, LIMIT SECONDARY ELECTRIC HEAT 2 S157 TERMINAL STRIP, UNIT REMOVEJUMPER PLUG WHEN FIELD INSTALLING ELECTRIC HEAT S20 LIMIT ON ”A” BOX UNITS IS RESETABLE HEATING 22.5 Lennox Commercial Page 40...
  • Page 41 PLUG, HEATING SENSORS STG 1 P271 SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT 1 SWITCH, LIMIT SECONDARY ELECTRIC HEAT 2 S157 TERMINAL STRIP, UNIT 15.0 − 048 22.5 15.0 15.0 15.0 K15−1 HEATING Lennox Commercial Page 41...
  • Page 42 Sequence of Operation -E1EH 7.5, 15, 22.5 - G, J, M Voltage HEATING ELEMENTS: END OF FIRST STAGE HEAT: 1 - Terminal Strip TB2 is energized when the unit discon­ 5 - Heating demand is satisfied. Terminal W1 in the ther­ nect closes.

  • Page 43: Operation

    ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT POWER: A55 Unit Controller, located in the main control box, supplies thermostat components with 24VAC. OPERATION: A55 receives data from the room/zone sensor A2 and energizes the appropriate components for heat or cool demand. Page 43...

  • Page 44: Sequence Of Operation

    ECONOMIZER SEQUENCE OF OPERATION POWER: A55 Unit Controller energizes the economizer components with 24VAC. OPERATION: Sensor(s), a global input, or a communication signal communicates to A55 when to power the damper motor B7. A55 supplies B7 with 0 - 10 VDC to control the positioning of economizer. The damper actuator provides 2 to 10 VDC position feedback.

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