Lennox LCM156U Installation Instructions Manual Download Page 34

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Page 34

LGM/LCM156, 180, 210, 240, 300

Multi-Staged Air Volume Operation

This is a summary of cooling operation. Refer to the

sequence of operation provided in the Engineering

Handbook or Service Manual for more detail.

Note - During a dehumidification demand the blower
operates at the highest speed. Free cooling is locked-out
during reheat operation. Refer to reheat start-up and
operation section for details.

A-Two-Stage T'Stat / Zone Sensor;

3- and 4-Compressor Units

1-Economizer With Outdoor Air Suitable

Y1 Demand -

Compressors Off
Blower Cooling Low
Dampers modulate

Y2 Demand -

Compressors Off
Blower Cooling High
Dampers Modulate

If dampers are at maximum open for three minutes,
compressor 1 and 2 are energized and blower stays on
cooling high.

2-No Economizer or Outdoor Air Not Suitable

Y1 Demand -

Compressor 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling Low
Dampers Minimum Position

Y2 Demand -

Compressor 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling High
Dampers Minimum Position

B-Three-Stage T'Stat / Zone Sensor
3 and 4 Compressor Units AND
Zone Sensor (4 Clg. Stages), 3-Compressor Units

1-Economizer With Outdoor Air Suitable

Three-Compressor Units:

Y1 Demand -

Compressors Off
Blower Cooling Low
Dampers Modulate

Y2 Demand -

Compressors Off
Blower Cooling Adjustable from Med to High
Dampers Modulate

Note - If dampers are at maximum open for three minutes,
compressor 1 is energized and blower stays on cooling
high.

Y3 Demand -
Compressor 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling High
Dampers Maximum Open

Four-Compressor Units:

Y1 Demand -

Compressors Off
Blower Cooling Low
Dampers modulate

Y2 Demand -

Compressors Off
Blower Cooling Adjustable from Med to High
Dampers Modulate

If dampers are at maximum open for three minutes,
compressors 1 and 2 are energized and blower stays on
cooling high.

Y3 Demand -

Compressor 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling High
Dampers Maximum Open

2-No Economizer or Outdoor Air Not Suitable

Three- and Four-Compressor Units:

Y1 Demand -

Compressor 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling Low

Y2 Demand -

Compressors 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling Adjustable from Med to High

Y3 Demand -

Compressors 1 (variable speed) On

Remaining compressors are energized
in order to maintain discharge air
temperature (DAT) rises above target

Blower Cooling High

Summary of Contents for LCM156U

Page 1: ...LGM LCM156U LGM LCM180U LGM LCM210U LGM LCM240U LGM LCM300U 13 Ton 15 Ton 17 5 Ton 20 Ton 25 Ton ROOFTOP PACKAGED UNITS 508117 01 2 2021 Electrical Connections Control Wiring Page 10 Blower Operation and Adjustments Page 12 Cooling Start Up Page 19 Temperature Thermistor Sensors Page 24 Gas Heat Start Up Page 28 Heating Operation and Adjustments Page 29 Electric Heat Start Up Page 29 Variable Air ...

Page 2: ...8 314 20 508 15 381 60 1 2 1537 AA BB CC DD CENTER OF GRA VITY TOP VIEW 4 1 2 114 20 508 SIDE VIEW FORKLIFT SLOTS Front and Left Side Only 132 5 8 3369 LIFTINGHOLES For Rigging Front and Back 25 3 8 645 107 3 4 2737 BASE OPTIONAL 115 VOLT OUTLET Factory Installed Inside Unit FLUE OUT LET OPTIONAL DISCONNECT Factory Installed CONDENSA TE DRAIN ALTERNATE THRU THE BASE CONDENSATE DRAIN LOCATION 1 5 8...

Page 3: ... 8 137 3 1 4 83 54 1 4 1378 51 1295 91 1 8 2315 BASE 8 1 4 210 10 1 4 260 4 102 OPTIONAL DISCONNECT Factory Installed CONDENSA TE DRAIN FLUE OUT LET SIDE VIEW FORKLIFT SLOTS Front and Left Side Only 132 5 8 3369 LIFTINGHOLES For Rigging Front and Back 25 3 8 645 107 3 4 2737 BASE OPTIONAL 115 VOLT OUTLET Factory Installed Inside Unit FLUE OUT LET ALTERNATE THRU THE BASE CONDENSATE DRAIN LOCATION 1...

Page 4: ...wn BLOWER MOTOR ECONOMIZER DAMPERS OPTIONAL CONDENSATE DRAIN VARIABLE SPEED COMPRESSOR INVERTER BLOWER INVERTER UNIT CONTROLLER 8 8 8 8 LCM156U 180U 210U 240U 300U PARTS ARRANGEMENT ELECTRIC HEAT EVAPORATOR COIL FILTERS SIX 24 X 24 X 2 210U 240U 300U Shown REHEAT COIL BLOWER MOTOR ECONOMIZER DAMPERS OPTIONAL BLOWERS CONDENSATE DRAIN VARIABLE SPEED COMPRESSOR INVERTER DISCONNECT FACTORY INSTALLED O...

Page 5: ...heat coil which provides a dehumidifying mode of operation Refer to Reheat Operation section Units are available with variable air volume or single zone variable air volume Refer to the 9th character of the model number to determine type of blower V Variable Air Volume M Single Zone Variable Air Volume Units use R410A an ozone friendly HFC refrigerant Refer to the Cooling Start Up section for prec...

Page 6: ...t be followed Fines and or incar ceration may be levied for non compliance Unit Support In downflow discharge installations install the unit on a non combustible surface only Unit may be installed on combustible surfaces when used in horizontal discharge applications or in downflow discharge applications when installed on an LARMF18 36 roof mounting frame NOTE Securely fasten roof frame to roof pe...

Page 7: ...oles in unit base rail See figure 2 1 Detach wooden base protection before rigging 2 Connect rigging to the unit base 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 style pick prevents damage to unit CAUTION Do not walk on unit IMPORTANT ALL PANELS MUS...

Page 8: ...ximum of 13 5 w c 3 36kPa When making piping connections a drip leg should be installed on vertical pipe runs to serve as a trap for sediment or condensate A 1 8 N P T plugged tap is located on gas valve for test gauge connection Refer to Heating Start Up section for tap location Install a ground joint union between the gas control manifold and the main manual shut off valve See figure 4 for gas s...

Page 9: ... Altitude Derate Locate the high altitude conversion sticker in the unit literature bag Fill out the conversion sticker and affix next to the unit nameplate Refer to table 1 for high altitude adjustments TABLE 1 HIGH ALTITUDE DERATE Altitude Ft Gas Manifold Pressure 2000 4500 See Unit Nameplate 4500 And Above Derate 2 1000 Ft Above Sea Level Units installed at 0 2000 feet do not need to be modifie...

Page 10: ...rical components in the unit Unbalanced power is a result of the power delivery system supplied by the local utility company Factory installed inverters are sized to drive blower motors with an equivalent current rating using balanced three phase power When unbalanced three phase power is supplied the installer must replace the existing factory installed inverter with an inverter that has a higher...

Page 11: ...ons as shown in figure 10 Note Install sensor and make communication wiring connections as shown in literature provided with sensor FIGURE 10 FIELD WIRING IN ZONE SENSOR MODE Zone Sensor Mode A2 SENSOR INPUTS SENSOR SENSOR 24VAC R C IAQ HUM AI1 AI2 TMP R UNIT CONTROLLER J298 D Hot Gas Reheat Units Only 1 Install humidity sensor in accordance with instructions provided with sensor A DDC input may b...

Page 12: ...mostat may also be used to initiate blower only G demand Unit will cycle on thermostat demand The following steps apply to applications using a typical electro mechanical thermostat 1 Blower operation is manually set at the thermostat subbase fan switch With fan switch in ON position blowers will operate continuously 2 With fan switch in AUTO position the blowers will cycle with demand Blowers and...

Page 13: ...ariable Air Volume Units Refer to the Variable Air Volume Start Up section 1 The following measurements must be made with a dry indoor coil Run blower G demand without a cooling demand Measure the indoor blower shaft RPM Air filters must be in place when measurements are taken 2 With all access panels in place measure static pressure external to unit from supply to return Blower performance data i...

Page 14: ...w belts after a 24 48 hour period of operation This will allow belt to stretch and seat into pulley grooves Make sure blower and motor pulley are aligned See figure 16 for blowers not equipped with a tensioner and figure 17 for units equipped with an optional belt tensioner Blowers Without Belt Tensioner 1 Loosen four screws securing blower motor to sliding base See figure 15 2 To increase belt te...

Page 15: ... figure 19 2 Apply perpendicular force to center of span X with enough pressure to deflect belt 1 64 for every inch of span length or 1 5mm per 100mm of span length Example Deflection distance of a 40 span would be 40 64 or 5 8 Example Deflection distance of a 400mm span would be 6mm 3 Measure belt deflection force For a used belt the deflection force should be 5 lbs 35kPa A new belt deflection fo...

Page 16: ...5 615 1 60 700 2 00 775 2 45 840 2 85 905 3 25 960 3 65 1015 4 10 1065 4 50 1115 4 95 1160 5 35 1205 5 80 1250 6 25 6000 530 1 30 630 1 75 710 2 15 785 2 60 850 3 05 910 3 45 970 3 90 1025 4 35 1075 4 80 1120 5 20 1170 5 65 1215 6 10 1255 6 55 6250 545 1 40 640 1 90 720 2 35 795 2 80 860 3 25 920 3 70 975 4 15 1030 4 60 1080 5 05 1130 5 50 1175 5 95 1220 6 45 1265 6 90 6500 560 1 55 650 2 05 730 2...

Page 17: ... Volume cfm Wet Indoor Coil Condenser Reheat Coil Gas Heat Exchanger Electric Heat Econo mizer Filters Horizontal Roof Curb 156 180 210 240 300 Low Standard Heat Medium Heat High Heat 156U thru 240U 300U in w g in w g in w g in w g in w g in w g in w g in w g MERV 8 MERV 13 in w g in w g 2750 01 02 01 02 04 05 01 03 03 3000 01 02 01 03 04 05 01 03 04 3250 01 03 01 03 05 06 01 04 04 01 3500 01 03 0...

Page 18: ...100245 20 N A N A 4 3 High 5 850 1045 1VP65x1 1 8 100239 03 BK110H 100788 06 BX65 100245 08 BX66 97J5901 H 1 3 16 105616 02 5 5 945 1185 1VP60x1 1 8 41C1301 BK90H x 1 7 16 100788 04 BX61 93J9801 BX62 57A7701 H 1 3 16 105616 02 6 7 5 850 1045 1VP65x1 3 8 78M7101 BK110H 100788 06 BX66 97J5901 BX67 100245 09 H 1 3 16 105616 02 7 7 5 10 945 1185 1VP60x1 3 8 78L5501 BK90H x 1 7 16 100788 04 BX62 57A770...

Page 19: ...B Start Up Supply Air Staged Blower Refer to the Multi Staged Air Volume Start Up section 1 Initiate first and second stage cooling demands using this mobile service app menu path SERVICE TEST COOLING COOL4 Instructions provided with the thermostat may also be used to initiate cooling 2 First stage thermostat demand will energize indoor blower in Low Cooling CFM Second stage thermostat demand will...

Page 20: ...ATOR COIL CIRCUITS ARE INTERTWINED CIRCUIT 3 CIRCUIT 1 2 INTERTWINED EVAPORATOR COIL not to scale ALL FOUR EVAPORATOR COIL CIRCUITS ARE INTERTWINED CONDENSER COIL CIRCUIT 1 3 ARE INTERTWINED FIGURE 21 210 240 300 REFRIGERANT CIRCUITS CONDENSER COIL CIRCUIT 2 4 ARE INTERTWINED CIRCUITS 3 4 INTERTWINED EVAPORATOR COIL not to scale CIRCUITS 1 2 INTERTWINED ...

Page 21: ...rm readings TABLE 5 156 Std Compressor 1 Frequency 56Hz 581014 01 Outdoor Coil En tering Air Temp Circuit 1 Circuit 2 Circuit 3 Dis 10 psig Suc 5 psig Dis 10 psig Suc 5 psig Dis 10 psig Suc 5 psig 65 F 228 127 256 131 258 140 75 F 267 130 295 134 298 148 85 F 309 133 337 136 340 153 95 F 352 135 383 139 387 156 105 F 403 139 432 142 433 159 115 F 457 142 485 145 486 162 TABLE 6 156 Reheat Compress...

Page 22: ...34 455 141 466 149 115 F 490 131 519 137 510 144 522 154 TABLE 14 300 Reheat Compressor 1 Frequency 68Hz 581023 01 Outdoor Coil En tering Air Temp Circuit 1 Circuit 2 Circuit 3 Circuit 4 Dis 10 psig Suc 5 psig Dis 10 psig Suc 5 psig Dis 10 psig Suc 5 psig Dis 10 psig Suc 5 psig 65 F 274 121 295 120 259 114 275 120 75 F 316 124 339 122 301 123 317 128 85 F 363 126 387 124 346 131 362 135 95 F 415 1...

Page 23: ...NS FIGURE 22 COND FAN 4 COND FAN 3 COND FAN 1 COND FAN 2 1 2 3 COMPRESSORS 210 240 300 Condenser fans 1 2 and 3 are energized when compressor 1 or 3 are energized As cooling demand increases all six condenser fans are energized Condenser fans 1 2 5 and 6 are energized after a 2 second delay See figure 23 Condenser fans 1 2 5 and 6 are de energized when outdoor temperature drops below 62 F 17 C Con...

Page 24: ...4 BLUE RT47 YELLOW RT46 RED RT50 BLUE RT43 YELLOW RT42 TABLE 16 THERMISTOR LOCATION Unit Sensor Figure 156 180 RT42 43 46 47 50 54 Figure 24 210 240 300 RT42 43 46 47 50 51 54 55 Figure 25 156 180 RT44 45 48 49 52 56 Figure 26 210 RT44 45 48 49 52 53 56 57 Figure 27 240 300 RT44 45 48 49 52 53 56 57 Figure 28 YELLOW RT46 THERMISTOR LOCATION 210 240 300 FOUR ROW EVAPORATOR COIL RT42 RT43 RT46 RT47 ...

Page 25: ...5 508117 01 2 2021 RED RT52 FIGURE 26 YELLOW RT48 BLUE RT49 YELLOW RT44 BLUE RT45 RED RT56 THERMISTOR LOCATION 156 180 CONDENSOR COIL RT44 RT45 RT48 RT49 RT52 RT56 SEE DETAIL G DETAIL G SEE DETAIL H DETAIL H ...

Page 26: ...0 240 300 FIGURE 27 THERMISTOR LOCATION 210 CONDENSOR COIL RT44 RT45 RT48 RT49 RT52 RT53 RT56 RT57 YELLOW RT44 BLUE RT45 RED RT56 GREEN RT57 RED RT52 YELLOW RT48 BLUE RT49 GREEN RT53 SEE DETAIL L DETAIL L SEE DETAIL K DETAIL K ...

Page 27: ...21 FIGURE 28 THERMISTOR LOCATION 240 300 CONDENSOR COIL RT44 RT45 RT48 RT49 RT52 RT53 RT56 RT57 RED RT52 YELLOW RT48 BLUE RT49 GREEN RT53 YELLOW RT44 BLUE RT45 RED RT56 GREEN RT57 SEE DETAIL N DETAIL N SEE DETAIL M DETAIL M ...

Page 28: ...nce turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies WARNING SMOKE POTENTIAL The heat exchanger in this unit could be a source of smoke on initial firing Take precautions with re spect to building occupants and property Vent ini tial supply air outside when possible WARNING Danger of explosion Can cause injury or death Do not attempt to light manu...

Page 29: ...ed to ignition control Switch is factory set and requires no adjustment 3 Spark ignitor energizes and gas valve solenoid opens 4 Spark ignites 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 valve 6 For troubleshooting purposes an ignition attempt...

Page 30: ...st blower speed percentage to meet design airflow specifications Allow blower speed to stabilize 6 Press NEXT and follow the instructions to calibrate static pressure If the static pressure meets the design specification press NEXT again to set the setpoint If the static pressure does not meet the design specification adjust the pressure and press NEXT to set the setpoint 7 Record new setpoints in...

Page 31: ...r in to VFD and P247 from P247 power out to blower See figure 34 11 Connect P246 to P247 See figure 35 FIGURE 33 VFD CONNECTORS A96 SUPPLY AIR VFD P247 P246 POWER IN TO VFD POWER OUT TO BLOWER 12 Restore power to unit Blower will operate in constant air volume CAV mode Note The indoor blower motor will start as soon as the main unit power is restored In manual bypass the blower will run regardless...

Page 32: ...s when the unit is in the occupied mode two minimum damper positions must be set The Unit Controller will open the damper to Min OCP Blwr High when blower CFM is at or ABOVE the midpoint CFM The Unit Controller will open the dampers to Min OCP Blwr Low when blower CFM is BELOW a midpoint CFM The Unit Controller will calculate the midpoint CFM TABLE 18 Blower CFM Design Specifications Unit T Stat o...

Page 33: ... Unit Controller menu SETUP INSTALL Press SAVE until the menu reads CONFIGURATION ID 1 Change the 6th character position to A for automatic bypass option Press SAVE Caution Units not equipped with an inverter will have the 6th character set to N indicating the inverter is not bypassed The blower motor could be damaged and or result in product or property damage if the setting is changed to automat...

Page 34: ...Units Y1 Demand Compressors Off Blower Cooling Low Dampers Modulate Y2 Demand Compressors Off Blower Cooling Adjustable from Med to High Dampers Modulate Note If dampers are at maximum open for three minutes compressor 1 is energized and blower stays on cooling high Y3 Demand Compressor 1 variable speed On Remaining compressors are energized in order to maintain discharge air temperature DAT rises...

Page 35: ...t Settings Control menu A91 Humidity Sensor Relative humidity should correspond to the sensor A91 output voltage listed in table 20 For example if indoor air relative humidity is 80 3 the humidity sensor output should read 8 00VDC Check the sensor output annually for accuracy Keep the air intake openings on the sensor clean and free of obstructions and debris TABLE 20 Relative Humidity RH 3 Sensor...

Page 36: ...wo refrigerant circuits are shown both circuits operate during reheat EVAPORATOR CIRCUITS 1 2 ARE INTERTWINED FIGURE 37 COOLING MODE REFRIGERANT ROUTING 156 180 UNITS REHEAT COIL CIRCUIT 1 CONDENSER COIL 1 2 EXPANSION VALVES CHECK VALVE L14 REHEAT VALVE L30 REHEAT VALVE 3 CHECK VALVE Note Two refrigerant circuits are shown both circuits operate when there is a cooling demand CIRCUIT 2 3 CONDENSER ...

Page 37: ...gerant circuits are shown both circuits operate during reheat CONDENSER COIL CIRCUIT 1 3 ARE INTERTWINED 4 FIGURE 39 COOLING MODE REFRIGERANT ROUTING 210 240 AND 300 UNITS REHEAT COIL 1 2 EXPANSION VALVES CHECK VALVE L14 REHEAT VALVE L30 REHEAT VALVE 3 CHECK VALVE Note Two refrigerant circuits are shown both circuits operate when there is a cooling demand CONDENSER COIL CIRCUIT 2 4 ARE INTERTWINED...

Page 38: ...ressor s is are off Blower and outdoor fans modulate to maintain indoor coil and dis charge air temperatures Thermostat Mode with Zone Relative Humidity RH Sensor Zone humidity is greater than Setpoint 2 Compressor 1 reheat on Compressor 1 modulates to maintain zone RH Reheat valve is energized Remaining compressors are off Blower and outdoor fans modulate to maintain indoor coil and discharge air...

Page 39: ...ls Wiring errors can cause improper and dangerous operation Verify proper operation after servicing C Burners Gas Units Periodically examine burner flames for proper appearance during the heating season Before 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 Open burner co...

Page 40: ...mined by looking through the vent opening Clean combustion air inducer as follows 1 Shut off power supply and gas to unit 2 Disconnect pressure switch air tubing from combustion air inducer port 3 Remove and retain screws securing combustion air inducer to flue box Remove and retain two screws from bracket supporting vent connector See figure 44 4 Clean inducer wheel blades with a small brush and ...

Page 41: ...ccumulated dirt or dust Turn off power before attempting to remove access panel or to clean blower wheel H Condenser Coil Clean condenser coil annually with detergent or commercial coil cleaner and inspect monthly during the cooling season Access panels are provided on front and back of condenser section J Needlepoint Bipolar Ionizer The optional brush type ionizer produces positive and negative i...

Page 42: ...HANNELS 20 TON SHOWN 5 IONIZERS LOWER FILTER BRACKET U CHANNEL UPPER FILTER BRACKET U CHANNEL IONIZER BRACKET EVAPORATOR COIL ONE EDGE PROTECTOR ON IONIZER BRACKET REMOVE THE SCREW SECURING THE BOTTOM OF THE UPPER FILTER RACK BRACKET REMOVE THE SCREW SECURING THE TOP OF THE UPPER FILTER RACK BRACKET TWO EDGE PROTECTORS ON FILTER RACK ...

Page 43: ... 3 Open the blower access door 4 Disconnect the UVC cable quick connects black white 5 Remove and retain the 3 mounting screws securing the UVC assembly Carefully remove the complete UVC assembly out through the blower access door See figure 47 6 Allow 10 minutes before touching the lamps Then carefully remove the lamp splash guards and lamp for annual replacement from each of the lamp holders See...

Page 44: ...ller Settings Use the mobile service app to adjust parameters menu paths are shown in each table Refer to the Unit Controller manual provided with each unit Tables 23 through 27 show factory settings in degrees of fan CFM etc Record adjusted settings on the label located inside the compressor access panel When field installing optional kits and accessories the Unit Controller must be configured to...

Page 45: ...inimum position during G blower operation Setting parameter 29 to 101 disables parameter 29 and passes control to parameter 9 or 132 219 75 75 75 75 75 Min damper for stg 2 power exhaust operation 216 10 10 10 10 10 Deadband for stage 1 power exhaust operation 220 10 10 10 10 10 Deadband for stage 2 power exhaust operation 224 100 100 100 100 100 Sec Stage 1 power exhaust off delay in seconds 30 7...

Page 46: ...al Stage D Unconfigured 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 Automatic Bypass M Manual Bypass U Unconfigured 7 Reserved N Reserved for future use 8 Outdoor Air CFM Control N Not applicable for future use L Outdoor Air Control Installed with A24 S...

Page 47: ...ed 1 Air Flow Proving Switch S52 3 Overflow Switch S149 S179 4 Reserved Reserved for future use N 7 Zone Bypass Damper N Not Installed Y Installed 6 IAQ Options N Not Installed 1 UV Lamp Installed 2 Bipolar Ionizer Installed 3 UV Lamp and Bipolar Ionizer Installed FIGURE 49 10 Reserved N Not Installed Phase Voltage Detection 5 N Not Installed 1 Enabled Internal Lennox 2 External A42 Phase Detectio...

Page 48: ...ndary voltage __________ 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 L1 L2 L1 L3 L2 L3 Disch Suct L1 L2 L3 L1 1 2 3 4 Blower Checks Pulley Belt Alignment Set Screws Tight Blower Rotation Belt Tension Nameplate Amps _________ Volts _______________ Motor...

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