Lennox LCM092U Installation Instructions Manual Download Page 28 | Manualshive

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Page 28

FIGURE 29

COOLING MODE REFRIGERANT ROUTING

Default Reheat Operation

TABLE 14

Reheat Operation - Two Cooling Stages - Default

T'stat and Humid

ity Demands

Operation

Reheat Only

Compressor 1 Reheat

Reheat & Y1

Compressor 1 & 2 Enhanced De
humidification at Low CFM

Reheat & Y1 & Y2

Compressor 1 & 2 Enhanced De
humidification at High CFM

*If there is no reheat demand and outdoor air is
suitable, free cooling will operate.
**If there is no reheat demand and outdoor air is suitable,
free cooling and compressor 1 will operate.

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Summary of Contents for LCM092U

Page 1: ...Page 24 INSTALLATION INSTRUCTIONS LGM092U LCM092U LGM102U LCM102U LGM120U LCM120U LGM150U LCM150U 7 5 Ton 8 5 Ton 10 Ton 12 5 Ton PACKAGED UNITS 508116 01 1 2021 Prognostic Diagnostic Sensors Page 20...

Page 2: ...NING 24 610 5 5 8 143 6 1 8 156 6 1 8 156 6 5 8 168 28 711 27 686 20 508 AA DD EE FF BOTTOM BASE BASE CONDENSATE 101 1 4 2572 BB CC BOTTOM SUPPLY AIR OPENING 60 1 8 1527 34 7 8 886 7 178 7 178 BOTTOM...

Page 3: ...IR INDUCER IGNITION CONTROL REHEAT COIL OPTIONAL COMPRESSOR INVERTER BEHIND THE HINGED PANEL WIRELESS BOARD WIFI ANTENNA LCM092 102 120 150 PARTS ARRANGEMENT UNIT CONTROLLER EVAPORATOR COIL CONDENSER...

Page 4: ...earances WARNING Electric shock hazard and danger of explosion Can cause injury death or product or property damage Turn off gas and electrical power to unit before performing any maintenance or servi...

Page 5: ...of mounting frame NOTE Securely fasten roof frame to roof per local codes CAUTION To reduce the likelihood of supply return air by pass and promote a proper seal with the RTU duct work duct drops diff...

Page 6: ...using both holes in each corner 3 All panels must be in place for rigging 4 Place field provided H style pick in place just above top edge of unit Frame must be of adequate strength and length H styl...

Page 7: ...er access door Refer to figure 6 REMOVE THREE SCREWS PER HINGE FIGURE 6 CONDENSATE DRAIN MULLION UNITS WITH HINGED PANELS FILTER DOOR 3 Open filter access door hinges and carefully remove door 4 Remov...

Page 8: ...Replace the condensate drain mullion and reinstall eight screws 14 Reinstall filter door on hinges Connect Gas Piping Gas Units Before connecting piping check with gas company or authorities having ju...

Page 9: ...main shut off valve and union furnished by installer be installed in gas line external to unit Union must be of the ground joint type After all connections have been made check all piping connections...

Page 10: ...figure 14 This does not supersede local codes or authorities having jurisdiction Do not apply power or close disconnect switch until installation is complete Refer to start up directions Refer closely...

Page 11: ...rmostat wires are rated for maximum unit voltage they must be routed away from line voltage wiring Use wire ties located near the lower left corner of the controls mounting panel to secure thermostat...

Page 12: ...rs with overall shield Belden type 8760 or 88760 plenum or equivalent Connect both cable shield drain wires to the Unit Controller as shown in figure 18 Wire runs over 150 feet mm Use a local isolated...

Page 13: ...es do not rub against the cabinet or against other refrigerant lines 4 Check voltage at disconnect switch Voltage must be within range listed on nameplate If not consult power company and have voltage...

Page 14: ...WITH CEILING DIFFUSERS MAIN DUCT RUN FIRST BRANCH OFF OF MAIN RUN DIFFUSER ROOFTOP UNIT ROOFTOP UNIT SUPPLY AIR READING LOCATION RETURN AIR READING LOCATION RETURN AIR READING LOCATION DIRECT DRIVE B...

Page 15: ...pically 60 of full load CFM TABLE 3 DIRECT DRIVE PARAMETER SETTINGS Parameter Factory Setting Field Setting Description 092 102 120 150 Note Any changes to Smoke CFM setting must be adjusted before th...

Page 16: ...2 0 2 2 2 4 2 6 RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 1750 1172 833 1231 932 1287 1039 1340 1156 1391 1283 1442 1426 2000 1197 913 1253 1019 1306 1135 1357 1261 1407 1398 1457 15...

Page 17: ...0 09 0 00 3000 0 09 0 11 0 12 0 13 0 13 0 03 0 02 0 06 0 10 0 02 3250 0 10 0 12 0 15 0 16 0 15 0 04 0 02 0 06 0 11 0 02 3500 0 11 0 12 0 16 0 17 0 15 0 04 0 03 0 07 0 12 0 04 3750 0 13 0 14 0 19 0 20...

Page 18: ...s unit is factory charged and should require no further adjustment If the system requires additional refrigerant reclaim the charge evacuate the system and add required nameplate charge NOTE System ch...

Page 19: ...139 300 139 855 F 349 141 341 141 955 F 399 144 390 144 1055 F 450 146 440 147 1155 F 508 149 494 150 TABLE 8 581031 01 LGM LCM120U No Reheat Outdoor Coil Entering Air Temp Circuit 1 Circuit 2 Dis ch...

Page 20: ...3275kPa 138 kPa 2 Low Pressure Switch S87 S88 The compressor circuit is protected by a loss of charge switch Switch opens at 40 psig 5 psig 276 34 kPa and automatically resets at 90 psig 5 psig 621 k...

Page 21: ...Page 21 RT47 RT42 43 SUCTION LINE TXV BULB FIGURE 23 RT46 RT42 RT43 THERMISTOR LOCATION RT42 43 46 47 EVAPORATOR COIL VIEW FROM FRONT SIDE OF UNIT...

Page 22: ...Page 22 RT44 FIGURE 24 THERMISTOR LOCATION RT44 45 VIEW FROM FRONT SIDE OF UNIT 092 102 CONDENSER COIL 120 150 CONDENSER COIL RT45 RT44 RT45 RT44 45...

Page 23: ...Page 23 RT49 RT48 THERMISTOR LOCATION RT48 49 VIEW FROM FRONT SIDE OF UNIT 092 102 CONDENSER COIL 120 150 CONDENSER COIL FIGURE 25...

Page 24: ...turn the gas control knob Never use tools If the knob will not push in or turn by hand do not try to repair it call a qualified service technician Force or attempted repair may result in a fire or ex...

Page 25: ...gas ignition sensor proves the flame and combustion continues 5 If flame is not detected after first ignition trial ignition control will repeat steps 3 and 4 two more times before locking out the gas...

Page 26: ...emand Compressors Modulate Blower Cooling Low Dampers Minimum Position Y2 Demand Compressors Modulate Blower Cooling High Dampers Minimum Position B Three Stage Thermostat 1 Economizer With Outdoor Ai...

Page 27: ...Reheat is factory set to energize when indoor relative humidity rises above 60 default The reheat setpoint can be adjusted by changing mobile service app Settings Control menu A setting of 100 will op...

Page 28: ...s Operation Reheat Only Compressor 1 Reheat Reheat Y1 Compressor 1 2 Enhanced De humidification at Low CFM Reheat Y1 Y2 Compressor 1 2 Enhanced De humidification at High CFM If there is no reheat dema...

Page 29: ...efore each heating season examine the burners for any deposits or blockage which may have occurred Clean burners as follows 1 Turn off both electrical power and gas supply to unit 2 Remove burner comp...

Page 30: ...d be examined periodically during the heating season to establish an ideal cleaning schedule With power supply disconnected the condition of the inducer wheel can be determined by looking through the...

Page 31: ...Flush coil and condensate drain with water taking care not to get insulation filters and return air ducts wet H Supply Air Blower Wheel Annually inspect supply air blower wheel for accumulated dirt or...

Page 32: ...in place 9 Close the blower access door 10 Reconnect power to the rooftop unit 11 Open the filter access door and look through the view port in the triangular sheet metal panel to verify that the UVC...

Page 33: ...Page 33 FIGURE 38 UVC ASSEMBLY UVC ASSEMBLY ASSEMBLY SECURED WITH 3 SCREWS DOOR SWITCH UVC LAMP...

Page 34: ...AGE PRESENT UVC LAMP NOT OPERATING GO TO LAMP LED TROUBLESHOOTING UVC LIGHT TROUBLESHOOTING POWER FIGURE 39 LAMPS BLACK ON ENDS BANDS AROUND LAMP INTACT CONTINUITY PRESENT LAMP LEDS NOT LIT LAMP LEDS...

Page 35: ...et SBUS Address LCONN ADDRESS TABLE 18 580683 LGM LCM 092U4E 2 Compressor Staged Direct Drive Para meter Factory Setting Field Setting Description Note Any changes to Smoke CFM setting must be adjuste...

Page 36: ...F could void warranty 86 0 F F Compressor 2 low temp lockout Settings lower than 0 F could void warranty TABLE 20 580684 LGM LCM 120U4E 2 Compressor Staged Direct Drive Para meter Factory Setting Fiel...

Page 37: ...ield CFM setting SETUP TEST BALANCE can also use SETTINGS RTU OPTIONS DAMPER 0 Damper min position during LOW blower operation 0 Damper min position during HIGH blower operation 50 Min damper for stag...

Page 38: ...igured U Power Exhaust Control 4 Not Installed N Damper Position A A34 Pressure Sensor C 5 Network Module N Not Installed L LonTalk Lennox 6 Blower Variable Frequency Drive Bypass N Not Installed A Au...

Page 39: ...Installed 1 Enabled Internal Lennox 2 External A42 Phase Detection on DI 2 3 External A42 Phase Detection on DI 3 N Not Installed Y Installed 8 Load Shedding N Not Installed G Global P297 pin 9 2 Ins...

Page 40: ..._______ Cooling Checks Compressor Rotation Ambient Temp ________Return Air Temp ________ Supply Air Temp ________ Compressor Amps Compressor Volts Pressures Condenser Fan Amps CC Heater Amps L1 L2 L3...

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