Lennox LGM Series Installation and operation manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
8.8.8.8
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can a󰀨ect
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
Table of Contents
Options . . . . . . . . . . . . . . . . . . . . . . . Page 2

High Altitude . . . . . . . . . . . . . . . . . . . Page 6
Blower Data . . . . . . . . . . . . . . . . . . . Page 7
Electrical Data . . . . . . . . . . . . . . . . Page 12

II Placement and Installation . . . . . Page 32
III Start Up Operation . . . . . . . . . . . Page 32
IV Charging . . . . . . . . . . . . . . . . . . . Page 33
V System Service Checks . . . . . . . Page 34
VI Maintenance . . . . . . . . . . . . . . . . Page 36
VII Accessories . . . . . . . . . . . . . . . . Page 38
VIII Diagrams . . . . . . . . . . . . . . . . . . Page 47
󰀩-
cy gas packaged units equipped with variable speed di-
rect drive blowers, an inverter-driven variable speed com-
pressor, and a variable speed outdoor fan.
        
(19 to 31 kW) heating inputs. LGM048, 060 and 074 units

heating inputs. Gas heat sections are designed with alu-
minized (stainless optional) steel tube heat exchangers.
Cooling capacities range from 3 to 6 tons (7 to 21kW).
Information contained in this manual is intended for use

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.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier.
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 disconnect
switch(es). Unit may have multiple power
supplies.
100038
02/2022
Ultra High E󰀩ciency LGM036U through 074U
LGM SERIES
3 to 6 ton

Page 2
OPTIONS / ACCESSORIES
Item Catalog
Number
Unit Model Number
036 048 060 074
COOLING SYSTEM
Condensate Drain Trap PVC 22H54 OX OX OX OX
Copper 76W27 OX OX OX OX
 21Z07 OX OX OX OX
Service Valves (not for Humiditrol™+ equipped units) Factory O O O O
HEATING SYSTEM
Bottom Gas Piping Kit 19W50 OX OX OX OX
Combustion Air Intake Extensions 19W51 XXXX
Gas Heat Input  Factory O O O O
Medium Two Stage - 81/108 kBtuh input Factory O O O O
 Factory O O O
Low Temperature Vestibule Heater 208/230V-3ph 21Z17 OX OX OX OX
460V-3ph 21Z18 OX OX OX OX
 21Z19 OX OX OX OX
LPG/Propane
Conversion Kits
For two-stage standard models 21Z24 XXXX
For two-stage medium and high models 21Z23 XXXX
Stainless Steel Heat Exchanger Factory O O O O
Vertical Vent Extension 31W62 XXXX
BLOWER - SUPPLY AIR
Motors DirectPlus™ Direct Drive ECM Blower System with MSAV®Factory O O O O
DirectPlus™ Direct Drive ECM Blower System with VAV Factory O O O O
CABINET
Combination Coil/Hail Guards 13T03 XXXX
Corrosion Protection (indoor coil / outdoor coil) Factory O O O O
CONTROLS
Commercial Controls Lennox®CORE Control System - LonTalk®Module 54W27 OX OX OX OX
CPC Einstein Integration Factory O O O OX
Novar®LSE Factory O O O O
Dirty Filter Switch 53W66 OX OX OX OX
Fresh Air Tempering 21Z08 OX OX OX OX
Smoke Detector - Supply or Return (Power board and one sensor) 21Z11 OX OX OX OX
Smoke Detector - Supply and Return (Power board and two sensors) 21Z12 OX OX OX OX
ELECTRICAL
Voltage
60 Hz
208/230V - 3ph Factory O O O O
460V - 3ph Factory O O O O
 Factory O O O O
HACR Circuit Breakers Factory O O O O
1 Short-Circuit Current Rating (SCCR) of 100kA (includes Phase/Voltage Detection) Factory O O O O
Disconnect Switch 80 amp 22A25 OX OX OX OX
GFI Service Outlets  74M70 OX OX OX OX
 67E01 OX OX OX OX
Weatherproof Cover for GFI 10C89 XXXX
Phase/Voltage Detection Factory O O O O
1Disconnect Switch is furnished and factory installed with High SCCR option.
1
Alternately, 110V power supply may be used to directly power the UVC ballast(s).

Page 3
OPTIONS / ACCESSORIES
Item Catalog
Number
Unit Model Number
036 048 060 074
ECONOMIZER
High Performance Economizer With Outdoor Air Hood (Sensible Control)
(Approved for California Title 24 Building Standards / AMCA Class 1A Certied)
High Performance Economizer - Includes Barometric Relief Dampers and Combination Hood 20H48 OX OX OX OX
High Performance Economizer - No Exhaust Option Factory O O O O
Economizer Accessories
Horizontal Economizer Conversion Kit 17W45 XXXX
Economizer Controls
󰀨 Order 2 21Z09 OX OX OX OX
Sensible Control Sensor is Furnished Factory O O O O
Single Enthalpy (Not for Title 24) 21Z09 OX OX OX OX
Outdoor Air CFM Control 13J76 XXXX
Global Control Sensor Field Provided Factory O O O O
Building Pressure Control 13J77 XXXX
POWER EXHAUST FAN
Standard Static
NOTE - Factory installed Power Exhaust Fan requires
“Barometric Relief Dampers for Power Exhaust Kit”
for eld installation. See below.
208/230V-3ph 21Z13 OX OX OX OX
460V-3ph 21Z14 OX OX OX OX
 21Z15 OX OX OX OX
BAROMETRIC RELIEF
1Barometric Relief Dampers for Power Exhaust Kit 21Z21 XXXX
² Horizontal Barometric Relief Dampers With Exhaust Hood 19F01 XXXX
OUTDOOR AIR
Outdoor Air Dampers With Outdoor Air Hood
Motorized 15D17 OX OX OX OX
Manual 15D18 OX OX OX OX
HUMIDITROL™+ HOT GAS REHEAT OPTION
 Factory O O O O
1Required when Economizer is factory installed with factory installed Power Exhaust Fan option.
2
1
Alternately, 110V power supply may be used to directly power the UVC ballast(s).

Page 4
OPTIONS / ACCESSORIES
Item Catalog
Number
Unit Model Number
036 048 060 074
INDOOR AIR QUALITY
Air Filters
Healthy Climate®󰀩
20 x 20 x 2 in.
MERV 8 (Order 4) 54W21 OX OX OX OX
MERV 13 (Order 4) 52W39 OX OX OX OX
MERV 16 (Order 4) 21U40 OX OX OX OX
Replaceable Media Filter With Metal Mesh Frame

(Order 4) 44N60 XXXX
Needlepoint Bipolar Ionization (NPBI)
Needlepoint Bipolar Ionization Kit 21U35 OX OX OX OX
Indoor Air Quality (CO2) Sensors
󰀨 77N39 XXXX
󰀨 87N53 XXXX
Sensor - Black plastic case with LCD display, rated for plenum mounting 87N52 XXXX
Sensor - Wall-mount, black plastic case, no display, rated for plenum mounting 87N54 XXXX
CO2 85L43 XXXX
Aspiration Box - for duct mounting non-plenum rated CO2sensors (87N53 or 77N39)90N43 XXXX
UVC Germicidal Lamps
1Healthy Climate®UVC Light Kit (110/230V-1ph) 21A92 OX OX OX OX
Step-Down Transformer 460V primary, 230V secondary 10H20 XXXX
 10H21 XXXX
ROOF CURBS
Hybrid Roof Curbs, Downow
8 in. height 11F50 XXXX
14 in. height 11F51 XXXX
18 in. height 11F52 XXXX
24 in. height 11F53 XXXX
Adjustable Pitched Curb
14 in. height 43W27 XXXX
Transition Curb
Matches Model L™ 036-074 Units to existing L Series®Curbs 20W06 XXXX
CEILING DIFFUSERS
Step-Down - Order one  13K61 XXXX
Flush - Order one  13K56 XXXX
Transitions (Supply and Return) - Order one T1TRAN20N-1 17W54 XXXX
1
Alternately, 110V power supply may be used to directly power the UVC ballast(s).


SPECIFICATIONS UNIT
General Data Nominal Tonnage 3 Ton 4 Ton 5 Ton 6 Ton
E󰀩ciency Type Ultra-High Ultra-High Ultra-High Ultra-High
Model Number LGM036U4E LGM048U4E LGM060U4E LGM074U4E
Blower Type DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
Model Number LGM036U4P LGM048U4P LGM060U4P LGM074U4P
Blower Type DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
Cooling
Performance
Gross Cooling Capacity - Btuh 34,600 47,000  71,000
Net Cooling Capacity - Btuh 34,000 46,000  69,000
AHRI Rated Air Flow - cfm 1200  1800 
Total Unit Power - kW 2.3 3.3 4.4 
SEER (Btuh/Watt) - 208/230V-3ph 1 121.0 120.0 - - -
SEER (Btuh/Watt) - 460V-3ph 122.0 120.2 1 - - -
 122.0 120.2 1 - - -
IEER (Btuh/Watt) - 208/230V-3ph - - - - - - - - - 223.3
IEER (Btuh/Watt) - 460V-3ph - - - - - - - - - 223.3
 - - - - - - - - - 223.3
EER (Btuh/Watt) - 208/230V-3ph 1 114.0 113.0 212.0
EER (Btuh/Watt) - 460V-3ph 1 113.7 1 212.0
 1 113.7 1 212.0
Refrigerant
Charge
Refrigerant Type R-410A R-410A R-410A R-410A
Without Reheat Option 17 lbs. 0 oz. 17 lbs. 0 oz. 16 lbs. 8 oz. 16 lbs. 8 oz.
With Reheat Option 17 lbs. 2 oz. 17 lbs. 2 oz. 16 lbs. 13 oz. 16 lbs. 13 oz.
Gas Heating Options Standard
(2 stage)
Medium (2 stage)
Standard (2 stage)
Medium (2 stage)
High (2 Stage)
Compressor Type (Number) Variable Capacity Scroll (1)
Outdoor Coil Net face area (total) - sq. ft. 19.3 19.3 19.3 19.3
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 2 2 2 2
Fins per inch 20 20 20 20
Outdoor Coil
Fans
Motor - (No.) HP (1) 1/3 (ECM) (1) 1/3 (ECM) (1) 1/3 (ECM) (1) 1/3 (ECM)
Motor rpm  600 - 900  
Total Motor watts  80 - 236 120 - 272 120 - 360
Diameter - (No.) in. (1) 24 (1) 24 (1) 24 (1) 24
Number of blades 3 3 3 3
Total air volume - cfm   3200 - 4300 3200 - 4700
Indoor
Coil
Net face area (total) - sq. ft. 9.72 9.72 9.72 9.72
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 3 3 4 4
Fins per inch 14 14 14 14
Drain connection - Number and size 1 in. NPT coupling
Expansion device type Balance port TXV
Indoor
Blower
Nominal motor output    
Blower wheel nominal diameter x width - in.    
Filters  Disposable
Number and size - in. (4) 20 x 20 x 2
Electrical characteristics 
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
1, 21210/240 or 2
pressure.

Page 6
SPECIFICATIONS GAS HEAT
Model No. 036, 048
060, 074
036, 048
060, 074
048
060, 074
Heat Input Type Standard (2 Stage) Medium (2 Stage) High (2 Stage)
Input
Btuh
1st Stage  81,000 113,000
2nd Stage  108,000 
Output
Btuh
1st Stage 43,000 66,000 92,000
2nd Stage  87,000 121,000
Temperature

1st stage   30 - 60
2nd Stage  30 - 70 
1 󰀩 81% 81% 81%
Gas Supply Connections 1/2 in. NPT
Recommended Gas Supply Pressure - Nat. / LPG 7 in. w.g. / 11 in. w.g.
Gas Supply Pressure
Range
 
Min./Max. (LPG) 
1󰀩
HIGH ALTITUDE DERATE
NOTE - Units may be installed at altitudes
up to 2000 ft. above sea level without any

units must be derated to match information

ft. unit must be derated 2% for each 1000 ft.
above sea level.
NOTE - This is the only permissible derate
for these units.
Heat Input Type Altitude Feet
Gas Manifold Pressure
in. w.g. Input Rate (Btuh)
Natural Gas LPG/Propane
Standard (2 stage)  3.0/1.7  60,000 / 49,000
Medium (2 stage)  3.0/1.7  
High (2 stage)  3.0/1.7  139,000 / 104,000

Page 7
BLOWER DATA 3 | 4 TON
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 󰀨
MINIMUM AIR VOLUME REQUIRED FOR DIFFERENT GAS HEAT SIZES: 
See Page 11 for wet coil and options/accessory air resistance data. DOWNFLOW
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
400 686 18 789 39 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 761 33 860   68 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
600 840 46 937 64 1031 80 1112 91 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
700 926 60 1020 77 1110 92 1190   117 1319 131 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
800 1022 73 1110 90   1272 119 1338 133 1399 148 1460 166  184 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
900 1126 88 1207 104 1286 119   1421  1480 168  187  207 1660 227 1719  - - - - - - - - - - - - - - - - - -
1000 1237 103 1310 120 1381 136 1447   171  190 1619 211 1676 232 1733  1788 280 1836 306 1879 332 - - - - - -
1100  120 1417 138 1481   174  194  216 1703 238  262 1810 287 1860 312  339 1946  1986 391
1200 1468 141    179 1637 200 1688 222 1739 246 1789 271 1839 296 1888 321  348 1977  2016 401  426
1300  164 1636  1687 206 1736 230 1783  1829 281 1877 306 1924 332 1969  2011 386  412 2088 438 2126 462
1400 1697 191 1744  1790 240 1834 266 1877 293 1920 320 1964 346 2007 371 2048 398 2088 424 2126 449 2163 474 2201 498
 1802 227 1846  1888 280 1930 308 1970 336 2010 361 2049 386 2089 410 2128 436 2166 461 2204 486 2241  2279 
1600 1903 271 1944 298 1984 326 2024  2062 380 2100 403 2137 426 2174 448 2211 474 2248 499   2322   
1700 2007 319  346 2083 373 2120 399  423 2193  2229 466 2264 489 2300  2336  2372  2407 604 2442 637
1800  363  390 2186 416 2221 442  466 2291 488     2393  2428  2462 631 2496 666  701
1900 2234 394  422 2296  2328 478   2391  2423    2487 629  664  699   2621 771
2000  434 2371 466 2399 498 2426    2484   630  667  703 2609 739 2643  2678 810 2713 
2100     2484   606  641  676  712 2631 748 2664 783 2697 818 2732  2768 887 2804 920
2200    623    694 2618 728  762 2683 796 2716 830  863  897 2821 930  963 2894 
2300  672 2612 707 2640 741 2669 776 2700 809 2734 842 2768  2802 908 2837 941 2873 974 2909 1007  1039 2981 1071
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
1.4 1.5 1.6 1.7 1.8 1.9 2.0
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1100 2028  2072 438 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1200  449 2138 473 2183 497 2229  2274  - - - - - - - - - - - -
1300  486 2206  2249  2293  2337  2381 620  
1400 2239  2279  2320  2361  2402 636 2443 668  701
 2317    2393 623 2432  2471 689  723  
1600 2396 612 2432  2468 679  714  748  783  818
1700 2477 672  707  742  777 2619 812  846 2691 881
1800  737  772 2634 808 2670 842  877 2741 911 2777 946
1900  806 2691 841 2727 876 2762 911 2798  2833 979 2868 1013
2000 2749 879  913 2820 947  981 2890   1049  1082
2100 2840  2876 987 2911 1020 2946  2981 1087  1121 3049 
2200 2930 1028  1061 3000 1094  1128 3069 1161 - - - - - - - - - - - -
2300 3017 1104  1137 3087 1170 - - - - - - - - - - - - - - - - - - - - - - - -

Page 8
BLOWER DATA 3 | 4 TON
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 󰀨
MINIMUM AIR VOLUME REQUIRED FOR DIFFERENT GAS HEAT SIZES: 
See Page 11 for wet coil and options/accessory air resistance data. HORIZONTAL
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
400 673 18 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  33 861  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 600 838 48 942 66 1037 80 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 700 928 61 1027 78 1118 92 1192 104 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
800 1023  1117 91 1204 106 1276 119 1339 134 1401  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 900  89 1212  1293 121 1362 136 1424   171  190 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1000 1232 104 1311 121 1386 138    174   1631 216 1689 239 1744 264 - - - - - - - - - - - - - - - - - - - - - - - -
1100 1341 121 1413 139 1481   178 1602 200 1660 223 1717 246 1772 271 1823 298 1868 326 1910  - - - - - - - - - - - -
1200  141  161  182 1638  1694 230   1804 281  308 1903  1946 363 1988 389 2029 412 2072 434 1300  164 1623 187 1680 211  237 1788  1841 292 1893 319 1941 347   2026 403 2067 428 2108   474 1400 1673 192 1728 219 1781 247 1832 276 1882  1931 334 1979 362 2024 391 2066 418 2107  2147 469 2188 493 2230   1778 229 1829  1879 289 1928 320 1974  2020 379 2064 408 2107 436 2149 463 2190 488 2231  2272  2312  1600 1881 274 1930 304 1978 336 2024 367 2067 396 2109    2193 481   2277  2318    2397 614
1700 1987 321 2033  2078 382 2122 412 2163 441 2204 469 2244 498 2286  2327  2368  2408 606 2446 638 2484 673 1800 2096 367 2139 397 2182 426 2224  2264 484 2303  2344  2384  2424  2463 626  660  698  738 1900 2208 396 2248 429 2288 461 2328 493 2367  2406    2484 618    686  726 2626 770  814 2000 2318 437  474 2394  2431  2469   622     2614 733 2648 773 2681 814 2712  2743 900 2100 2424  2461  2497   628  668 2603 708 2637 748 2672 788 2706 828 2738 867 2770 906 2802  2833 983 2200    623 2602 664 2636  2670  2703 786 2737 826 2770 866 2803   944 2866 983 2897 1021 2929 1060 2300 2638  2672 700 2707 741 2740 781 2773 822  862 2838 902 2870 942 2902 982 2934 1021   2996 1098 3027 1136
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
1.4 1.5 1.6 1.7 1.8 1.9 2.0
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1100 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1200 2192 497 2234    - - - - - - - - - - - - - - - - - - - - - - - -
1300 2271  2312    2393 626 2431  - - - - - - - - - - - -
1400   2392 621 2431  2470 683  717    788  2436 646 2474 679  712  746  781 2620 816   1600  709  744  779 2628  2663  2696 887 2730 923 1700  778 2640    2709 889 2742 926  963 2807 999 1800 2690  2723   933 2790 970 2822 1008  1044 2886 1081 1900  941 2808 979 2841 1016 2873   1090 2937 1126 2969 1162 2000  1021 2898  2930 1096 2963 1132  1168 3027 1204  1240
2100 2961 1097 2993   1172  1208 3089  - - - - - - - - - - - -
2200  1173 3091 1211 3122 1248  1284 - - - - - - - - - - - - - - - - - -
2300 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Page 9
BLOWER DATA 5 | 6 TON
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 󰀨
MINIMUM AIR VOLUME REQUIRED FOR DIFFERENT GAS HEAT SIZES: 
See Page 11 for wet coil and options/accessory air resistance data. DOWNFLOW
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
400  12 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 727 26 822 46 918 63 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
600 802 40 896  990 74 1072 86 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
700 883   70   1148 99 1218 111 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
800 970 66  82 1146 97 1226 111 1296   139 1420  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
900  79   1233 110 1309  1377 140 1438  1499 174  193 1621 213 - - - - - - - - - - - - - - - - - - - - - - - -
1000 1167 93 1246 109 1323   141 1460      1638  1696 237  260 1801  1844 311 - - - - - -
1100 1274 108 1347  1418 142    177  197 1662 219 1718 242 1773   290 1872 316 1914 343  368
1200 1383 126  144  162  181  201 1691 223 1746 247 1800 272  297 1900 323 1944   377 2022 402 1300 1493 146  164  184 1672  1726 229 1779  1831 280 1882 306 1931 332 1977  2019 386  413 2094 438 1400 1602 167  188 1714 211 1766  1816 261 1866 289  316 1964 343 2010 370  397 2093 424 2132 449 2169 474  1707 194  219 1808 244  271 1904 300  328 1996  2041 381  408 2127 434 2168  2207 484   1600 1803 231   1898 286  314 1990 342 2034 369 2077  2120 419 2162  2204 471  496   2324 
1700 1898  1944 303 1989 331 2034  2078 386 2120 410 2162 434 2204   484 2286  2327  2366  2403  1800 1998 318 2041 347   2128 402 2171 427 2213    2294  2334  2374  2412  2449 621 2484  1900 2102 341 2143 371  401 2226 431 2267  2308 487 2348  2387    2463 611 2499 646  682  719 2000 2206 361  396  431    499 2404  2442  2479 604  641  677   2619   790 2100 2308 407 2347 446 2386  2424  2462  2499 600  638  676  714 2640  2674 789 2707 826 2738 863 2200 2410 477 2449  2487     636  674 2630 712 2664  2698 787 2732   862 2797 898 2828 934 2300      631  670 2660 709 2694 747 2727 784 2760 822 2793  2826 896  933 2889 969 2920 1004 2400 2621 627  666 2693 706 2728 744 2762 782 2794 820 2826   894 2890 931 2922 968  1004 2984 1040 3014 1076  2729 703 2764 742 2798 781 2831 819 2864   893 2927 930  967 2989 1004 3020 1040  1076 3080 1112 3111 1147
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
1.4 1.5 1.6 1.7 1.8 1.9 2.0
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1100 1990 392 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1200 2060 426 2098 449 2136 470 2176 493 - - - - - - - - - - - - - - - - - -
1300 2131 462 2169  2208  2247  2286    2363 609 1400 2206 498 2244  2282  2320    2396 627 2433   2283  2321     617 2432 648 2467 680  713 1600 2362  2398 608 2434 640 2469 673  707  741   1700 2439 631 2474   700  736  772 2606 807 2639 842 1800  691  728    802 2647 838 2680 873 2713 908
1900 2600  2631 794 2663 832 2694 868 2726 904  940 2791  2000 2683 827  864 2746 901 2777 937 2809 972 2841 1008 2873 1043 2100 2770 899 2800  2831 971 2863 1006 2894 1041 2926 1077  1112
2200  970 2889  2920 1040  1076 2983 1111 3014 1146 3046 1181
2300  1040 2981 1076 3012 1111 3043 1146 3074 1182 - - - - - - - - - - - -
2400  1111  1147 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Page 10
BLOWER DATA 5 | 6 TON
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (heat section, economizer, etc.). 󰀨
MINIMUM AIR VOLUME REQUIRED FOR DIFFERENT GAS HEAT SIZES: 
See Page 11 for wet coil and options/accessory air resistance data. HORIZONTAL
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
400  20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 776 37 880  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 600 867  968 71  83 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 700  67   1143 97 1209 107 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 800  81  98 1233 112 1299 123  137 1416  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 900   1248 113 1326 128 1390 142 1448   176  194 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1000 1266 111 1348 129 1421 146 1483 163  182  202  223 1706 244  268 - - - - - - - - - - - - - - - - - - - - - - - -
1100 1377 129  149  168  188  210 1690 232 1744  1794 280 1840 306 1882 333 1922  - - - - - - - - - - - -
1200 1489   172 1618 194 1676 218 1731 243 1784 268  293 1883 320 1926 347 1967 374 2006 398 2046 420 2086 441 1300 1602  1663 200 1720 226 1774  1827 281 1878 308 1927  1972 363 2013 391  417 2091 441 2131 463 2170 484 1400 1712 207 1768  1822  1873 296 1923  1971  2017 382  410 2100 437 2139 462 2177  2217     1817 248 1871 279 1922 311 1971 343 2017 373 2062 402 2106 431 2148  2188 484 2227  2267  2306  2344  1600 1922  1973 328 2023 360 2069 392 2113 422   2198 479 2239  2280  2320    2397 609 2434 638
1700 2030  2078 377 2126 409 2170 439 2212 469  498 2294  2336  2376   606   2490 668  703 1800 2141 391 2187 423 2231  2274 484     2396  2436   627      734 2616 774 1900  423 2297  2339 492 2380  2420  2460  2499 623    689 2609 727 2642 769 2674 813 2704  2000  470     2484   628  666  703 2634 740 2668 779 2701 819 2732 861 2763 903 2793 944 2100 2472     631  674 2624 716    798 2730 838 2763 877   2826   991 2888 1028 2200  624 2618 668  711 2692  2727  2762 837 2796 877 2830 917 2863  2894   1033  1071 2987 1108 2300 2689 704 2726 748 2762 791 2798 833 2832  2866 916 2899  2932 997 2964 1036 2996 1074 3027 1112   3088 1187 2400 2798 784 2834 827 2870 870 2904 913 2937  2970  3003 1036  1076 3067  3098  - - - - - - - - - - - - - - - - - -  2908 864 2943 907 2977  3011 992 3043 1034 3076  3108  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Total
Air
Volume
cfm
Total Static Pressure - in. w.g.
1.4 1.5 1.6 1.7 1.8 1.9 2.0
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1100 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1200 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1300 2210  2248  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1400   2332  2369 607  634 2439 661 - - - - - - - - - - - -
 2382 609 2418 637  666 2489   726    792 1600 2470 669  700  731  763 2606 796 2637 829 2667 863 1700  737  770 2626 804  838 2689 872 2719 906 2748 940 1800 2649 811 2681 847 2713 882 2744 917 2774  2803 987 2832 1021
1900 2736  2767 932 2798 968 2828 1003  1039 2886 1073 2914 1108 2000  982  1019 2886  2916 1090   2974  3003 1193 2100 2919   1101 2980 1137 3010 1172 3039 1206 3069 1240 3098 1274 2200 3018 1144 3048 1180 3078 1216 3108  - - - - - - - - - - - - - - - - - -
2300 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2400 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Page 11
POWER EXHAUST FAN PERFORMANCE
Return Air System Static
Pressure
in. w.g.
Air Volume Exhausted
cfm
0.00 2000
 1990
0.10 1924
 1810
0.20 1664
 
0.30 
 1210
BLOWER DATA
CEILING DIFFUSERS AIR RESISTANCE (in. w.g.)
Air Volume - cfm
RTD11-95S Step-Down Di󰀨user FD11-95S
Flush
Di󰀨user
2 Ends
Open
1 Side &
2 Ends Open All Ends & Sides Open
1800 0.13 0.11 0.09 0.09
2000  0.13 0.11 0.10
2200 0.18  0.12 0.12
2400 0.21 0.18  0.14
2600 0.24 0.21 0.18 0.17
2800 0.27 0.24 0.21 0.20
3000 0.32 0.29  
CEILING DIFFUSER AIR THROW DATA
Air Volume - cfm 1 E󰀨ective Throw - ft.
RTD11-95S FD11-95S
2600 24 - 29 19 - 24
2800  20 - 28
3000 27 - 33 21 - 29
1󰀨
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g.
Air
Volume
cfm
Wet Indoor Coil Humiditrol™+
Reheat Coil
Gas Heating
Economizer
Filters
036, 048 060, 074 Medium
Heat High Heat MERV 8 MERV 13 MERV 16
800 0.01 - - - - - - 0.02 0.02 0.04 0.04  0.04
1000 0.02 0.02 0.00 0.02 0.02 0.04 0.04 0.07 
1200 0.03 0.04 0.00 0.02 0.02 0.04 0.04 0.07 
1400 0.04  0.01 0.02 0.03 0.04 0.04 0.07 0.06
1600  0.07 0.02 0.03 0.04 0.04 0.04 0.07 0.08
1800 0.06 0.08 0.02 0.04   0.04 0.07 0.09
2000 0.08 0.10 0.02 0.04 0.06   0.08 0.10
2200 - - - 0.11 0.04 0.04 0.07   0.08 0.11
2400 - - - 0.13 0.04  0.08   0.08 0.12

Page 12
ELECTRICAL DATA 3 TON
Model No. LGM036U4E / LGM036U4P
1 Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor Rated Load Amps 9.1  4.1
Outdoor Fan
Motor
Full Load Amps 2.8 1.4 1.1
Power Exhaust
(1) 0.33 HP
Full Load Amps 2.4 1.3 1
   20
Indoor Blower
Motor
Horsepower   
Full Load Amps 4.4 2.3 2.3
2Maximum
Overcurrent
Protection (MOCP)
Unit Only   
With (1) 0.33 HP
Power Exhaust
30  
3Minimum
Circuit
Ampacity (MCA)
Unit Only 19 11 9
With (1) 0.33 HP
Power Exhaust
21 12 10

1Extremes of operating range are plus and minus 10% of line voltage.
2HACR type breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
ELECTRICAL DATA 4 TON
Model No. LGM048U4E / LGM048U4P
1 Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor Rated Load Amps 13.8  
Outdoor Fan
Motor
Full Load Amps 2.8 1.4 1.1
Power Exhaust
(1) 0.33 HP
Full Load Amps 2.4 1.3 1
   20
Indoor Blower
Motor
Horsepower   
Full Load Amps 4.4 2.3 2.4
2Maximum
Overcurrent
Protection (MOCP)
Unit Only   
With (1) 0.33 HP
Power Exhaust
40  
3Minimum
Circuit
Ampacity (MCA)
Unit Only  12 11
With (1) 0.33 HP
Power Exhaust
27 14 12

1Extremes of operating range are plus and minus 10% of line voltage.
2HACR type breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 13
ELECTRICAL DATA 5 TON
Model No. LGM060U4E / LGM060U4P
1 Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor Rated Load Amps 14.6 7 
Outdoor Fan
Motor
Full Load Amps 2.8 1.4 1.1
Power Exhaust
(1) 0.33 HP
Full Load Amps 2.4 1.3 1
   20
Indoor Blower
Motor
Horsepower   
Full Load Amps 4.4 2.3 2.4
2Maximum
Overcurrent
Protection (MOCP)
Unit Only 40  
With (1) 0.33 HP
Power Exhaust
40 20 
3Minimum
Circuit
Ampacity (MCA)
Unit Only 26 13 11
With (1) 0.33 HP
Power Exhaust
28 14 12

1Extremes of operating range are plus and minus 10% of line voltage.
2HACR type breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
ELECTRICAL DATA 6 TON
Model No. LGM074U4E / LGM074U4P
1 Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor Rated Load Amps 16.9 8.3 6.8
Outdoor Fan
Motor
Full Load Amps 2.8 1.4 1.1
Power Exhaust
(1) 0.33 HP
Full Load Amps 2.4 1.3 1
   20
Indoor Blower
Motor
Horsepower   
Full Load Amps 4.4 2.3 2.4
2Maximum
Overcurrent
Protection (MOCP)
Unit Only  20 
With (1) 0.33 HP
Power Exhaust
 20 
3Minimum
Circuit
Ampacity (MCA)
Unit Only 29  12
With (1) 0.33 HP
Power Exhaust
31 16 13

1Extremes of operating range are plus and minus 10% of line voltage.
2HACR type breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 14
LGM PARTS ARRANGEMENT
8.8.8.8
EVAPORATOR
COIL CONDENSER
FAN
CONDENSER
COIL
COMPRESSOR
CONDENSATE
DRAIN
FILTERS (4)
20 X 20 X 2”
ECONOMIZER
(OPTIONAL)
GAS VALVE
BURNERS
COMBUSTION
AIR INDUCER
BLOWER
(DIRECT DRIVE)
TXV
UNIT
CONTROLLER
REHEAT COIL
(OPTIONAL)
COIL
GUARDS
(OPTIONAL)
IGNITON CONTROL
FIGURE 1
LGM HINGED CONTROL PANEL
T1
T34
K191
K1
A55
FIGURE 2

Page 15
J386 J387 J388 J389 J390 J391 J392 J393
J395
J394
MODBUS
J413
LONTalk
Module
24VAC
Gnd
S−BUS SmartWire
System J304
Humidistat
Digital
Inputs
Smoke
24VAC
Gnd
24VAC
Thermostat
Service Relays
R + C
Spare
Analog
Inputs
Room
and RH
Sensors
Sensor
IAQ
TX
J358
Duct Sensor
J378
4−Character Seven
Segment LED
J379
J380
J381
J382
J383
J385
J384
J298 J297 J299
Sensor
IAQ
A11 HUM TMP
Sensor Inputs
A12 C R
White Push
Button
Black Push
Button
Service Relays
P5
S−BUS
Factory Te st
P2 Expansion
Card Connection
(C4)
CORE Unit Controller (A55) Wireless Control (W4)
FIGURE 3
I-UNIT COMPONENTS
All 3 through 6 ton (7 through 21 kW) units are congure to
order units (CTO). The LGM unit components are shown
in gure 1. All units come standard with hinged unit pan-
els. All L1, L2, and L3 wiring is color coded; L1 is red, L2
is yellow, and L3 is blue.
A-Control Box Components
LGM control box components are shown in gure 2. The
control box is located in the upper right portion of the com-
pressor compartment.
1-Control Transformers T1/T43
PINK GRAY
ORANGE BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
208/230V TRANSFORMER
FIGURE 4
All use a single line voltage to 24VAC transformer mount-
ed on the hinged control panel. Transformer supplies pow-
er to control circuits in the unit. The transformer is rated at
70VA and is protected by a 3.5 amp circuit (CB8).
The 208/230 (Y) voltage transformers use two primary
voltage taps as shown in gure 4, while the 460 (G) volt-
age transformer use a single primary voltage tap. T43 is
used for units with hot gas reheat for additional 24VAC.
2-Transformer T4 (J voltage)
All J volt units are equipped with a line voltage to 460V
3-phase transformer to power the indoor blower motor. T4
is mounted in the back panel of the compressor section
above T5.
3-Transformer T5 (G and J voltage)
All units use transformer T5 mounted in the back panel
in the compressor section. T5 is a line voltage to 230V
transformer to power the combustion air inducer, outdoor
fan motor, and optional UVC light ballast.. It is connected
to line voltage and is powered at all times.
4-Unit Controller A55 (Figure 3)
The Unit Controller provides all unit control functions, unit
status information, unit diagnostics, programmable pa-
rameters, and USB verication and prole sharing. The
unit controller can only be interfaced with via the CORE
Service mobile app. Refer to the Unit controller instruc-
tions provided for additional details on pairing and app
functions

Page 16
Use this QR code to download the mobile
service app. Follow the prompts to pair the
ure 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. Look for the following icon.
Attention!
The Unit Controller uses input from a zone/room sensor
cooling, a thermostat, or a third-party controller to operate
the unit. Zone/room sensor, thermostat, and third-party
controller wires are connected to J297 on the Unit Con-
troller.
Many default Unit Controller settings are adjustable. Re-
fer to the unit installation instruction or the Unit Controller
manual provided with the unit.
        
and accessories for proper function. Each character in the
󰀨
unit installation instruction or the Unit Controller manual
provided with the unit.
5-Compressor Contactor K1
The Unit Controller closes n.o. K1 contacts to provide
power to the inverter control board (A192). The contactor
does not energize the compressor in the same manner as
a traditional cooling system. Three phase units use three
pole double break contactors with a 24 volt coil.
6-Crankcase Heater Relay K191
All units use relay K191 to control crnkcase heater HR1.
7-Power Exhaust Relay K65 (PED units)
          
      

  -


B-Cooling Components
All units use a single cooling circuit consisting of a variable
-

condenser fan and a single direct drive blower. The blow-
er draws air across the evaporator during unit operation.
        -
stalled economizer. The evaporator coil is slab type and
uses a thermostatic expansion valve as the primary refrig-
erant metering device. The evaporator is also equipped
        
protected by a high pressure switch (S4) on the discharge
-
sor, and a low pressure switch (S87) on the suction line.

1-High Pressure Switch S4
The high pressure switch is an auto-reset SPST N.C.
switch which opens on a pressure rise.
S4 is located in the compressor discharge line and wired

When discharge pressure rises to 640 ± 10 psig (4412 ±
69 kPa) (indicating a problem in the system) the switch
opens and the compressor inverter is de-energized (the
economizer can continue to operate). The switch automat-

2-Low Pressure Switch S87
The compressor circuit is protected by a loss of charge
switch located on the suction line. Switch opens at 40 psig
           

3-High Temperature Limit Switch S5
The variable speed compressor is equipped with a com-
pressor- mounted normally closed temperature switch that
prevents compressor damage due to overheating caused
by internal friction. The switch is located on top of the
compressor casing. This switch senses the compressor
       󰀨
compressor operation. The auto-reset switch closes when
      
and the compressor is re-energized. This switch is a sin-
gle-pole, single-throw (SPST) bi-metallic switch and is


Page 17
PLUMBING AND COMPRESSOR PROTECTION COMPONENTS
EVAPORATOR COIL
CONDENSER COIL
DRIER
COMPRESSOR
RETURN AIR
SECTION
INDOOR
BLOWER
SECTION
EXPANSION
VALVE
HEAT
SECTION
S5
S87
S4
FIGURE 5
4-Thermistors
Units are equipped with four factory-installed thermistors
󰀨
on the refrigerant circuit.
The thermistors provide the Unit Controller with constant
-
frigeration circuit. These temperatures are used as feed-
back in certain modes of unit operation. In addition, the
Unit Controller uses these temperatures to initiate alarms

of charge.

operation and to initiate valid alarms. See table 1 for prop-
er locations.
TABLE 1
THERMISTOR LOCATION
Unit RT42 & RT46 RT44 & RT48
036U, 048U Figure 6 Figure 8
060U, 074U Figure 7

Page 18
THERMISTOR LOCATION RT42 & 46
036 & 048 THREE-ROW EVAPORATOR COIL
(VIEW FROM FRONT SIDE OF UNIT)
RT42
RT46
TOR TUBE
CLAMP THERMISTOR
TO BARE COPPER;
TOR SLEEVE
SUCTION
LINE
TXV BULB
DETAILS NOT TO SCALE
FIGURE 6

Page 19
THERMISTOR LOCATION RT42 & 46
060U & 074 FOUR-ROW EVAPORATOR COIL
(VIEW FROM FRONT SIDE OF UNIT)
RT42
RT46
DISTRIBUTOR
TUBE
CLAMP THERMISTOR TO
BARE COPPER; NOT THE
DISTRIBUTOR SLEEVE
SUCTION LINE
TXV BULB
DETAILS NOT TO SCALE
FIGURE 7

Page 20
THERMISTOR LOCATION RT44 & RT48
036-048 CONDENSER COIL
(VIEW FROM FRONT SIDE OF UNIT)
RT48
RT44
LIQUID LINE
EXIT
FIGURE 8
WARNING
Electrical shock hazard. Compressor must be
grounded. Do not operate without protective cover
over terminals. Disconnect power before removing
protective cover. Discharge capacitors before
servicing unit. Failure to follow these precautions
could cause electrical shock resulting in injury or
death.
5-Variable Speed Compressor B1
All units use one variable speed scroll compressor. See
“SPECIFICATIONS” and “ELECTRICAL DATA” (table of
contents) or compressor nameplate for compressor spec-


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 9