Lennox LHT/LDT024 Installation Instructions Manual
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Lennox LHT/LDT024 Installation Instructions Manual

Lennox LHT/LDT024 Installation Instructions Manual

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2022
WARNING
To prevent serious injury or death:
1-
Lock-out/tag-out before performing maintenance.
2-
If system power is required (e.g., smoke detector mainte­
nance), disable power to blower, remove fan belt where
applicable, and ensure all controllers and thermostats are
set to the "OFF" position before
performing maintenance.
3-
Always keep hands, hair, clothing, jewelry, tools, etc.,
away from moving part

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RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Use this QR code to download the mobile service app. Follow the prompts
to pair the app with the unit control system and configure the unit. Refer to the
"Download Mobile App" section in this manual and the Setup Guide provided
with this unit. The QR code is also available in the unit control area.
The app can be downloaded from the appropriate iOS or Android store.
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Attention!
Look for the following icon.
INSTALLATION
INSTRUCTIONS
LHT/LDT036
HEAT PUMP AND DUAL-FUEL PACKAGED UNITS
508303-01
10/2022
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WARNING
Improper installation, adjustment, alteration, ser­
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser­
vice must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier
2-Ton
3-Ton
4-Ton
5-Ton
Page 32
Page 34
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Page 35
Page 35
Page 36
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Page 42

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Summary of Contents for Lennox LHT/LDT024

  • Page 1: Table Of Contents

    INSTALLATION WARNING INSTRUCTIONS To prevent serious injury or death: Lock-out/tag-out before performing maintenance. LHT/LDT024 2-Ton If system power is required (e.g., smoke detector mainte­ nance), disable power to blower, remove fan belt where LHT/LDT036 applicable, and ensure all controllers and thermostats are 3-Ton set to the “OFF”...

  • Page 2: Dimensions

    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. LHT/LDT024, 036, 048, 060 DIMENSIONS in. - Gas heat section shown 5−5/8 16−1/4...

  • Page 3: Parts Arrangements

    HEAT REVERSING VALVE LDT024, 036, 048, 060 PARTS ARRANGEMENT EVAPORATOR INDOOR BLOWER UNIT COIL CONTROLLER CONDENSER FILTERS CONDENSER COIL ECONOMIZER (OPTIONAL) 8.8.8.8 OUTDOOR CONDENSATE DRAIN COMBUSTION AIR INDUCER BURNERS COMPRESSOR GAS VALVE REVERSING VALVE Page 3 LHT/LDT024, 036, 048, 060...

  • Page 4: Shipping And Packing List

    (gas units). On LHT units, see clearance to combustible materials as reclaiming must be followed. Fines and/or incar­ outlined on heater rating plate. ceration may be levied for non-compliance. Minimum Operation Clearance - Required clearance for proper unit operation. Page 4 LHT/LDT024, 036, 048, 060...

  • Page 5: Unit Support

    RTU, duct work / duct drops / diffuser assemblies must be Supports must be constructed of steel or suitably supported independently to the building structure. treated wood materials. Page 5 LHT/LDT024, 036, 048, 060...

  • Page 6: Duct Connection

    LIFTING POINT SHOULD BE DIRECTLY ABOVE CENTER OF GRAVITY HORIZONTAL RETURN AIR DUCT CAUTION - Do not walk on unit. INSTALL BAROMETRIC RELIEF DAMPERS AND HOOD IN RETURN AIR DUCT FIGURE 2 FIGURE 4 Page 6 LHT/LDT024, 036, 048, 060...

  • Page 7: Condensate Drains

    See figure 9. DRAIN PAN REMOVE DRAIN PAN CAULK AROUND CONDENSATE COUPLING OPEN VENT MOUNTING FRAME Minimum Pitch DRAIN PAN 1” (25 mm) per 10' (3 m) of line FIGURE 6 FIGURE 9 Page 7 LHT/LDT024, 036, 048, 060...

  • Page 8: Gas Piping

    Once in place, check to make sure the leum gases. coupling is still positioned through the rear condensate drain hole. 9- Use a field-provided 3/4” plug to seal side drain connection. 10- Replace the condensate drain mullion. Page 8 LHT/LDT024, 036, 048, 060...

  • Page 9: Pressure Test Gas Piping

    SUPPLY PRESSURE TEST GAS LINE 2-1/2” NIPPLE MANUAL MAIN SHUT-OFF VALVE DRIP LEG Grommets for both gas pipe openings are field provided. MANUAL MAIN SHUT-OFF VALVE FIGURE 12 GAS VALVE FIGURE 13 Page 9 LHT/LDT024, 036, 048, 060...

  • Page 10: High Altitude Derate

    INSTALL 1- Units are factory-wired for 230 / 460 / 575 volt supply. For 208V supply, remove the insulated terminal cover FIGURE 14 from the 208V terminal on the control transformer. Page 10 LHT/LDT024, 036, 048, 060...
  • Page 11 A thermostat or return air sensor can be used Mode. Use the mobile service app menu and select as a back-up mode. Make zone sensor wiring Settings > Install. connections as shown in figure 16. Page 11 LHT/LDT024, 036, 048, 060...
  • Page 12 Note - Only stage one is used; stage 2 is not used. Although the recommended balance point setpoint is 35_F, the setpoint can be adjusted. Weigh the comfort / cost benefit when increasing the setpoint. Page 12 LHT/LDT024, 036, 048, 060...

  • Page 13: Blower Operation And Adjustments

    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 DIFFUSER LOCATION LOCATION FIGURE 17 Page 13 LHT/LDT024, 036, 048, 060...
  • Page 14 (all units). •VENTILATION CFM This is the percentage of torque for high static blower ventilation speed. TABLE 3 ELECTRIC HEAT MINIMUM AIRFLOW Direct Drive Direct Drive (Impeller-Style) 1200 1100 1500 22.5 1600 2000 Page 14 LHT/LDT024, 036, 048, 060...
  • Page 15 Number of seconds to hold blower at low speed before switching to blower at high FREE COOLING STAGE-UP DELAY speed. Default 300 seconds. Installer: Record any parameter changes under “Field Setting” column. Settings need to be recorded by installer for use when Unit Controller is replaced or reprogrammed. Page 15 LHT/LDT024, 036, 048, 060...
  • Page 16 Page 16...
  • Page 17 Page 17...
  • Page 18 Page 18...
  • Page 19 Page 19...
  • Page 20 Page 20...
  • Page 21 Page 21...
  • Page 22 Page 22...
  • Page 23 B LO WE R D ATA FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g. Wet Indoor Coil Gas Heating Filters Electric Econo Volume Standard Medium High Heat mizer 024, 036, 048 MERV 8 MERV 13 MERV 16 Heat Heat Heat 0.01...
  • Page 24 3- Unit is charged with R-410A refrigerant. See unit A-Start-Up rating plate for correct amount of charge. Heating - LHT/LDT024 Unit Only 4- Refer to Refrigerant Charge and Check section for proper method to check refrigerant charge. 1- In heat pump heating, 024 units will automatically...
  • Page 25 TABLE 9 SUBCOOLING TEMPERATURE Liquid Saturated Temp. Minus Unit Liquid Temperature 7.4°F + 1 (4.1°C + 0.5) 7.6°F + 1 (4.2°C + 0.5) 5.7°F + 1 (3.2°C + 0.5) 6.8°F + 1 (3.8°C + 0.5) Page 25 LHT/LDT024, 036, 048, 060...

  • Page 26: Diagnostic Sensors

    Unit Controller. If the system fails to calibrate or obtain readings for demand defrost, defrost will run-time at field setting. Low gas heat (LDT) or electric heat (optional) is energized during defrost. Page 26 LHT/LDT024, 036, 048, 060...
  • Page 27 LHT/LDT024, 036, 048 INDOOR COIL RT46 22J06 YELLOW RT46 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 18 Page 27 LHT/LDT024, 036, 048, 060...

  • Page 28: Lht/Ldt024

    LHT/LDT024, 036 OUTDOOR COIL RT48 22J08 YELLOW RT48 FIGURE 19 Page 28 LHT/LDT024, 036, 048, 060...

  • Page 29: Lht/Ldt048

    LHT/LDT048 OUTDOOR COIL RT48 22J08 YELLOW RT48 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 20 Page 29 LHT/LDT024, 036, 048, 060...

  • Page 30: Lht/Ldt060

    LHT/LDT060 INDOOR COIL RT46 22J06 YELLOW RT46 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 21 Page 30 LHT/LDT024, 036, 048, 060...
  • Page 31 LHT/LDT060 OUTDOOR COIL RT48 22J08 YELLOW RT48 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE FIGURE 22 Page 31 LHT/LDT024, 036, 048, 060...

  • Page 32: Cooling Operation

    RTU MENU > COMPONENT TEST > COOLING > COOLING STAGE 2 Low speed compressor cooling operation: RTU MENU > COMPONENT TEST > COOLING > COOLING STAGE 1 Note - For 024 units, either menu path will result in single-speed output. Page 32 LHT/LDT024, 036, 048, 060...
  • Page 33 Blower Heating Speed Low Gas Heat Energized automatic. At temperatures above 40_F, compressor will automatically stage-down to maintain operational Note - Gas heat is also energized during the defrost cycle. efficiency. Page 33 LHT/LDT024, 036, 048, 060...

  • Page 34: Gas Heat Start-Up

    NOTE - When unit is initially started, steps 1 through 9 death. Do not attempt to light manually. may need to be repeated to purge air from gas line. Unit has a direct spark ignition system. 11- The ignition sequence will start. Page 34 LHT/LDT024, 036, 048, 060...

  • Page 35: Heating Operation And Adjustments

    Steady On Power applied. Control OK. 3 Flashes Ignition lockout from too many trials. Ignition lockout from too many flame 4 Flashes losses within single call for heat. 5 Flashes Control hardware fault detected. Page 35 LHT/LDT024, 036, 048, 060...

  • Page 36: Service

    Periodically examine burner flames proper appearance during the heating season. Before each heating season examine the burners for any deposits or blockage which may have occurred. Page 36 LHT/LDT024, 036, 048, 060...
  • Page 37 7- Replace mullion. heating season. However, it should be examined 8- Clean combustion air inlet louvers on blower access periodically during the heating season to establish an ideal cleaning schedule. panel using a small brush. Page 37 LHT/LDT024, 036, 048, 060...
  • Page 38 Remove wire ties connecting coils slabs and separate SUPPLY slabs 3-4” (76-102mm). Clean coils with detergent or commercial coil cleaner. BLOWER Rinse thoroughly with water and reassemble CONDENSER field-provided wire ties to connect coil slabs. COILS CONDENSER ACCESS PANEL FIGURE 29 Page 38 LHT/LDT024, 036, 048, 060...
  • Page 39 SUPPLY AIR COVER AND THE BACK TWO SCREWS SE­ OF THE IONIZER BRACKET. BE SURE CURE THE FRONT TO ENGAGE THE IONER BRACKET OF THE IONIZER TO WHEN REPLACING THE SCREW. THE BLOWER DECK. IONIZER FIGURE 31 Page 39 LHT/LDT024, 036, 048, 060...
  • Page 40 NOTE - The bands around the lamp should be evenly spaced 3- Open the blower access door. as shown in the diagram. 4- Remove the screw in wire tie from the UVC assembly FIGURE 33 and disconnect the 4-pin connector from the lamp end. Page 40 LHT/LDT024, 036, 048, 060...
  • Page 41 Sweep the broken glass and debris into a plastic bag, seal the bag, and dispose of properly. Contact your local waste management office for proper disposal. Do not use a vacuum cleaner. Do not incinerate. Page 41 LHT/LDT024, 036, 048, 060...

  • Page 42: Factory Unit Controller Settings

    Change the appropriate character in the > Set “LONTALK” configuration I.D. For example, when an economizer is installed using a single enthalpy sensor, change configuration I.D. 1, the second character, to “S”. Page 42 LHT/LDT024, 036, 048, 060...
  • Page 43 M = Manual Bypass U = Unconfigured Power Exhaust Control [4] Not Installed = N Damper Position = A A34 Pressure Sensor = C [5] Network Module N = Not Installed L = LonTalk (Lennox) FIGURE 35 Page 43 LHT/LDT024, 036, 048, 060...
  • Page 44 Phase / Voltage Detection * [5] [6] IAQ Options Not Installed = N N = Not Installed Enabled Internal (Lennox) = 1 1 = UV Lamp Installed External (A42) Phase Detection = 2 2 = Bipolar Ionizer Installed on DI-2...
  • Page 45 Altitude:____________ Primary Limits Operate: j Manifold Pressure Gas Valve Low Fire High Fire Accessory Checks Power Exhaust Amps None j 1 _____________ 2 ____________ Control Type Economizer Operation Min. Pos. j Motor travel full open/close Page 45 LHT/LDT024, 036, 048, 060...

This manual is also suitable for:

Lht/ldt036Lht/ldt048Lht/ldt060

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