Lennox LCM Series User manual
Page 1
100025
LCM SERIES
Service Literature
13 to 25 ton
45.7 to 88 kW
Revised 08/2021
LCM156U through 300U
The LCM156H, 180, 210, 240 and 300 units are configure to
order units (CTO) with a wide selection of factory installed
options.
Cooling capacities range from 13 to 25 tons (45.7 to 88 kW).
LCM156 and 180 utilize three compressors and four con
denser fans, while LCM210, 240 and 300 utilize four com
pressors and six condenser fans.
Optional electric heat is factory- or field-installed. Electric
heat operates in single or multiple stages depending on the
kW input size. 15kW to 60 kW heat sections are available
for the LCM156 and 180 units and 15 kW to 90 kW heat sec
tions are available for the LCM210, 240, 300.
Multi-Stage Air Volume MSAV®blower option is available.
The VFD-driven blower will operate at lower speeds when
demand is low and increase to higher speeds when demand
is high.
Variable speed VAV system is available as an option which
enables supply duct static measurement to control blower
CFM and discharge air temperature to control cooling
stages.
All LCM units are designed to accept any of several differ
ent energy management thermostat control systems with
minimum field wiring. Factory- or field-provided control op
tions connect to the unit through Smartwiretconnectors.
When "plugged in" the controls become an integral part of
the unit wiring.
The CORE Control System is designed to accelerate
equipment install and service. Standard with all Model L™
rooftop units, control system integrates key technologies
that lower installation costs, drive system efficiency, and
protect your investments.
The CORE Unit Controller is a microprocessor-based con
troller that provides flexible control of all unit functions.
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 qualified installer or service
agency.
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.
Table of Contents
Options / Accessories Page 2.....................
Specifications Page 6............................
Blower Data Page 9.............................
Electrical / Electric Heat Data Page 12..............
Electric Heat Capacities Page 17...................
Unit Parts Arrangement Page 18...................
I-Unit Components Page 18.......................
II-Charging Page 33..............................
III-Start Up - Operation Page 35....................
IV-System Service Checks Page 35................
V-Maintenance Page 35..........................
VI-Accessories Page 36...........................
VII-Hot Gas Re-Heat Page 40......................
VIII-Staged Blower Page 44.......................
IX- VAV System Page 46.........................
X-Wiring and Operation Sequence Page 48..........
Page 2
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
156 180 210 240 300
COOLING SYSTEM
Condensate Drain Trap PVC 22H54 OX OX OX OX OX
Copper 76W27 XXXXX
Corrosion Protection Factory O O O O O
21Z07 OX OX OX OX OX
Refrigerant Type R-410A O O O O O
™ Factory O O O O O
BLOWER - SUPPLY AIR
Blower Option
Factory O O O O O
Factory O O O O O
Factory O O O O O
Motors Factory O
Factory O O O
Factory O O O O O
Factory O O O O
Factory O O
Drive Kits
Factory O O O
Factory O O O
Factory O O O O O
Factory O O O O O
Factory O O O O O
Factory O O O O
Factory O O O O
Factory O O O O
Factory O O
Factory O O
Factory O O O O O
CABINET
13T12 XXXXX
CONTROLS
21Z10 OX OX OX OX OX
®® 54W27 OX OX OX OX OX
Novar® Factory O O O O O
L Connection® - - - X X X X X
53W68 OX OX OX OX OX
21Z08 OX OX OX OX OX
83W40 OX OX OX OX OX
83W41 OX OX OX OX OX
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
156 180 210 240 300
INDOOR AIR QUALITY
Air Filters
®
54W67 OX OX OX OX OX
52W40 OX OX OX OX OX
21U42 OX OX OX OX OX
44N61 XXXXX
Indoor Air Quality (CO) Sensors
77N39 XXXXX
87N53 XXXXX
87N52 XXXXX
87N54 XXXXX
CO 85L43 XXXXX
CO2sensors
87N53 or 77N39
90N43 XXXXX
Needlepoint Bipolar Ionization (NPBI)
21U37 OX OX OX
21U38 OX
21U39 OX
UVC Germicidal Light Kit
1® 21A94 OX OX OX OX OX
10H20 XXXXX
ELECTRICAL
Factory O O O O O
Factory O O O O O
Factory O O O O O
54W85 OX OX OX OX OX
54W86 OX OX OX OX OX
54W87 OX OX OX OX OX
Factory O O O O O
74M70 OX OX OX OX OX
Factory O O O O O
10C89 XXXXX
1
2
Page 4
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
156 180 210 240 300
ELECTRIC HEAT
22H66 OX OX OX OX OX
22H67 OX OX OX OX OX
22H68 OX
22H69 OX
22H70 OX OX OX OX
22H71 OX OX OX OX
22H72 OX
22H73 OX
22H74 OX OX OX OX
22H75 OX OX OX OX
22H76 OX
22H77 OX
22H78 OX OX OX OX
22H79 OX OX OX OX
22H80 OX OX OX
22H81 OX OX OX
ECONOMIZER
22J18 OX OX OX OX OX
Economizer Controls
Order 2 21Z09 OX OX OX OX OX
Factory O O O O O
21Z09 OX OX OX OX OX
Factory O O O O O
13J77 XXXXX
13J76 XXXXX
Barometric Relief Dampers With Exhaust Hood (required with economizer)
54W78 OX OX OX OX OX
16K99 XXXXX
OUTDOOR AIR
Outdoor Air Dampers With Outdoor Air Hood
22J27 OX OX OX OX OX
13U05 OX OX OX OX OX
¹ POWER EXHAUST (DOWNFLOW APPLICATIONS ONLY)
22H90 OX OX OX OX OX
460V 22H91 OX OX OX OX OX
HUMIDITROL™+ HOT GAS REHEAT OPTION - SZVAV MODELS ONLY
Factory O O O O O
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
156 180 210 240 300
ROOF CURBS
11F58 XXXXX
11F59 XXXXX
11F60 XXXXX
11F61 XXXXX
Adjustable Pitch Curb
43W26 XXXXX
Standard Roof Curbs, Horizontal - Requires Horizontal Return Air Panel Kit
11T89 XXXX
11T90 X
11T96 XXXX
11T97 X
Insulation Kit For Standard Horizontal Roof Curbs
73K32 XXXX
73K33 X
73K34 XXXX
73K35 X
Horizontal Return Air Panel Kit
87M00 XXXXX
CEILING DIFFUSERS
13K63 X X
13K64 XXX
13K58 X X
13K59 XXX
12X68 X X
12X70 XXX
1and
Page 6
SPECIFICATIONS 13 TON
General Data Nominal Tonnage 13 Ton 13 Ton
Model Number LCM156U4M LCM156U4V
Ultra-High Ultra-High
Blower Type
VAV
Cooling
Performance
1
1
1
1
Refrigerant
Charge
Refrigerant Type R-410A R-410A
- - -
- - -
- - -
Electric Heating Options Available
Compressor Type (number)
Outdoor Coils
2 2
20 20
Outdoor Coil
Fans
Indoor Coils
14 14
2Indoor
Blower
and
Drive
Selection
2 hp
Kit 1
Kit 2
3 hp
Kit 1
Kit 2
5 hp
Kit 3
Kit 4
Kit 5
Filters
Electrical characteristics
1
2
SPECIFICATIONS 15 TON | 17.5 TON
General Data Nominal Tonnage 15 Ton 15 Ton 17.5 Ton 17.5 Ton
Model Number LCM180U4M LCM180U4V LCM210U4M LCM210U4V
Ultra-High Ultra-High Ultra-High Ultra-High
Blower Type
VAV
VAV
Cooling
Performance
1
1
1
1
Refrigerant
Charge
Refrigerant Type R-410A R-410A R-410A R-410A
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - - - - -
Electric Heating Options Available
Compressor Type (number)
Outdoor Coils
(Fin/Tube)
2222
20 20 20 20
Outdoor Coil
Fans
Indoor Coils
14 14 14 14
2Indoor
Blower
and
Drive
Selection
3 hp
Kit 1
Kit 2
5 hp
Kit 3
Kit 4
Kit 5
7.5 hp
Kit 6
Kit 7
Kit 8
Filters
Electrical characteristics
1
2
Page 8
SPECIFICATIONS 20 TON | 25 TON
General Data Nominal Tonnage 20 Ton 20 Ton 25 Ton 25 Ton
Model Number LCM240U4M LCM240U4V LCM300U4M LCM300U4V
Ultra-High Ultra-High Ultra-High Ultra-High
Blower Type
VAV
VAV
Cooling
Performance
1
1 6000 6000
1
1
Refrigerant
Charge
Refrigerant Type R-410A R-410A R-410A R-410A
- - - - - -
- - - - - -
- - - - - -
- - - - - -
Electric Heat Options Available
Compressor Type (number)
Outdoor Coils
(Fin/Tube)
22
20 20 20 20
Outdoor Coil
Fans
Indoor Coils
4444
14 14 14 14
2Indoor
Blower
and
Drive
Selection
5 hp
Kit 3
Kit 4
Kit 5
7.5 hp
Kit 6
Kit 7
Kit 8
10 hp
Kit 7
Kit 10
Kit 11
Filters
Electrical characteristics
1
2
BLOWER DATA
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL & AIR FILTERS IN PLACE
FOR ALL UNITS ADD:
MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT
Air Volume
cfm
TOTAL STATIC PRESSURE - Inches Water Gauge (Pa)
0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
600 680 820 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
610 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
620 840 - - - - - - - - - - - - - - - - - - - - - - - -
1010 1060 1110 - - - - - - - - - - - -
4000 1020 1160
1120 1210
800 1080
660 810 1040 1180
480 880 1140
680 1000 1100
1010 1060 1110 1200 1240
840 1160
6000 1120
640 860 1080 1220
1040 1140
880
1200 1240
600 1160
1020 1260
1080 1180
8000 640 800 1040 1140
810 880 1100 1240 1280
1060 1110 1160
1120
1080 1220
860 1040 1140 - - - - - -
1100 1240 - - - - - - - - - - - -
820 1060 1110 1160 - - - - - - - - - - - -
1120 1260 - - - - - - - - - - - - - - - - - -
1080 1180 - - - - - - - - - - - - - - - - - - - - - - - -
860 1040 - - - - - - - - - - - - - - - - - - - - - - - -
1000 1200 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
820 1010 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Page 10
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE
Air Volume
cfm
Wet Indoor Coil
Humiditrol™+
Reheat Coil
Electric
Heat Economizer Filters
Horizontal
Roof Curb
156
180
210
240
300
156 thru
240 300
in. w.g. in. w.g. in. w.g. in. w.g. in. w.g. MERV 8 MERV 13 MERV 16 in. w.g. in. w.g.
- - - - - - -
- - - - - - -
- - - - - -
- - - - - -
- - - - - -
4000 - - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
6000 - - -
8000
BLOWER DATA
FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS
Nominal
hp
Maximum
hp
Drive Kit Number RPM Range
2 1
2 2
1
2
4
6
8
10
10 10
10 11
Page 11
POWER EXHAUST FAN PERFORMANCE
Return Air System Static Pressure Air Volume Exhausted
in. w.g. cfm
8210
1840
CEILING DIFFUSER AIR RESISTANCE - in. w.g.
Air
Volume
cfm
RTD11-185S RTD11-275S
FD11-185S FD11-275S
2 Ends Open 1 Side/2 Ends
Open
All Ends &
Sides Open 2 Ends Open 1 Side/2 Ends
Open
All Ends &
Sides Open
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
6000
6200 - - - - - - - - - - - -
6400 - - - - - - - - - - - -
- - - - - - - - - - - -
6600 - - - - - - - - - - - -
6800 - - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
8000 - - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
- - - - - - - - - - - -
CEILING DIFFUSER AIR THROW DATA - ft.
Model
No.
Air Volume
cfm
1 Model
No.
Air Volume
cfm
1
RTD11-185S
Step-Down
FD11-185S
Flush
RTD11-275S
Step-Down
FD11-275S
Flush
180
210
240
6000
6200
6400 8000
6600 8200 41 - 46
1
8400
8600
8800
BLOWER DATA
Page 12
ELECTRICAL/ELECTRIC HEAT DATA 13 TON
Model No. LCM156U4
1Voltage - 60Hz 208/230V-3ph 460V-3ph
21 11
Motor
2 2
2
80 40
80 80 40
68
80
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V
2
Protection
Unit+
15 kW 80 80 40
30 kW 4 90 100 4 100 110 4 100 60 60
45 kW 4 150 80 80 80
60 kW 4 150 4 150 4 150 80 80
Unit+
15 kW 68 68
30 kW 88 100 104 100 112
45 kW
60 kW 146 166 82
2
Protection
Unit+
15 kW 80 80 80 80 40
30 kW 4 100 110 4 100 110 4 110 60 60 60
45 kW 4 150 4 150 4 150 80 80
60 kW 4 150 4 150 80
Unit+
15 kW 80 80
30 kW 106 110 106 118
45 kW 81
60 kW 141 160 164 80 82
1
2
4
ELECTRICAL/ELECTRIC HEAT DATA 15 TON
Model No. LCM180U4
1Voltage - 60Hz 208/230V-3ph 460V-3ph
21 11
16
110
16
110
Motor
11
2
80 110 40
100 110
80 42
41
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V
2
Protection
Unit+
15 kW 80 80 110 110 40
30 kW 4 100 110 4 100 4 110 60 60 60
45 kW 4 150 4 150 80 80
60 kW 4 150 4 150 80
Unit+
15 kW 80 80 42
30 kW 104 100 112 121
45 kW 148 166 82
60 kW 146 166 82 86
2
Protection
Unit+
15 kW 100 100 110 110
30 kW 4 100 110 4 110 4 125 60 60
45 kW 4 150 4 150 80
60 kW 4 150 4 175 200
Unit+
15 kW 41
30 kW 110 106 118
45 kW 81
60 kW 164 162 181 82
1
2
4
Page 14
ELECTRICAL/ELECTRIC HEAT DATA 17.5 TON
Model No. LCM210U4
1Voltage - 60Hz 208/230V-3ph 460V-3ph
21 11
Motor
11
2
100 110
100 110 60
88 104 40
100 46
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V
2
Protection
Unit+
15 kW 100 100 110 110
30 kW 4 100 110 4 110 60 60 60
45 kW 4 150 4 150 80 80
60 kW 4 150 4 150 80
90 kW 4 225 4 225 4 225
Unit+
15 kW 88 88 104 104 40
30 kW 104 100 112 121
45 kW 148 166 82
60 kW 146 166 82 86
90 kW 201 218 118
2
Protection
Unit+
15 kW 100 100 110 110 60
30 kW 4 100 110 4 110 4 125 60 60
45 kW 4 150 4 150 80
60 kW 4 150 4 175 200
90 kW 4 225 4 225 4 225 4 300
Unit+
15 kW 100 100 46
30 kW 110 106 118
45 kW 81
60 kW 164 162 181 82
90 kW 244 224 118 122 126
1
2
4
ELECTRICAL/ELECTRIC HEAT DATA 20 TON
Model No. LCM240U4
1Voltage - 60Hz 208/230V-3ph 460V-3ph
21 11
60
60
60
Motor
10 10
11 14
2
110 60
110 60 60
104 112
48
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V
2
Protection
Unit+
15 kW 110 110 60
30 kW 4 110 4 125 60 60
45 kW 4 150 4 150 80
60 kW 4 150 4 175 200
90 kW 4 225 4 225 4 250 4 300
Unit+
15 kW 104 104 112 112
30 kW 100 112 121
45 kW 148 166 82 86
60 kW 146 166 164 82 86
90 kW 218 118 126
2
Protection
Unit+
15 kW 110 110 60 60
30 kW 4 110 4 125 4 125 60
45 kW 4 150 4 175 200
60 kW 4 175 200 4 175 200 100
90 kW 4 225 4 225 4 300 4 250 4 300
Unit+
15 kW 48
30 kW 106 118 66
45 kW 162 180 81
60 kW 162 181
90 kW 244 224 262 122 126
1
2
4
Page 16
ELECTRICAL/ELECTRIC HEAT DATA 25 TON
Model No. LCM300U4
1Voltage - 60Hz 208/230V-3ph 460V-3ph
21 11
Motor
10 10
11 14
2
Protection
60
80
121 61
126 142 60 64
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V
2
Protection
Unit+
15 kW 60
30 kW 80
45 kW 4 150 4 150
60 kW 4 150 4 175 200
90 kW 4 225 4 225 4 250 4 300
Unit+
15 kW 121 121 61
30 kW 121 121 82 86
45 kW 148 166 82 86
60 kW 146 166 164 118 126
90 kW 218 162
2
Protection
Unit+
15 kW 80
30 kW
45 kW 4 150 4 175 200 100
60 kW 4 175 200 4 175 200
90 kW 4 225 4 225 4 300 4 250 4 300
Unit+
15 kW 126 126 142 142 60 64
30 kW 126 126 142 142 81
45 kW 162 180
60 kW 162 181 122 126
90 kW 244 224 262 162 166
1
2
4
ELECTRIC HEAT CAPACITIES
Volts
Input
15 kW 30 kW 45 kW 60 kW 90 kW
kW
Input
Btuh
Output
No. of
Stages
kW
Input
Btuh
Output
No. of
Stages
kW
Input
Btuh
Output
No. of
Stages
kW
Input
Btuh
Output
No. of
Stages
kW
Input
Btuh
Output
No. of
Stages
208 1 1 2 2 2
220 1 1 2 2 2
1 1 2 2 2
240 1 1 2 2 2
440 1 1 2 2 2
460 1 1 2 2 2
480 1 1 2 2 2
Page 18
PARTS ARRANGEMENT
(LCM210, 240, 300 SHOWN)
FIGURE 1
8.8.8.8
ELECTRIC
HEAT
EVAPORATOR
COIL
FILTERS
(SIX - 24 X 24 X 2”)
REHEAT
COIL
BLOWER
MOTOR
ECONOMIZER
DAMPERS
(OPTIONAL)
BLOWERS
CONDENSATE
DRAIN
VARIABLE SPEED
COMPRESSOR INVERTER
DISCONNECT
(FACTORY-INSTALLED
OPTION)
CONDENSER FANS
(4 ON 156 & 180)
CONDENSER
COILS
COMPRESSORS
(3 ON 156 & 180)
BLOWER
INVERTER
UNIT
CONTROLLER
I-UNIT COMPONENTS
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.
All 13 through 25 ton (45.7 through 88 kW) units are config
ure to order units (CTO). Unit components are shown in fig
ures 1. All units come standard with hinged unit panels. The
unit panels may be held open with the door rod located in
side the unit. All L1, L2 and L3 wiring is color coded; L1 is
red, L2 is yellow and L3 is blue.
A-Control Box Components
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect elec
tronic components. Take precautions to
neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
Control box components are shown in figure 3. The control
box is located in the upper portion of the compressor com
partment.
1-Disconnect Switch S48
Units with higher SCCR rating may be equipped with an dis
connect switch S48. Other factory or field installed optional
circuit breakers may be used, such as CB10. S48 and CB10
are toggle or twist-style switches, which can be used by the
service technician to disconnect power to the unit.
2-Control Transformer T1
All use a single line voltage to 24VAC transformer
mounted in the control box. Transformer supplies power
to control circuits in the unit. The transformer is rated at
70VA and is protected by a 3.5 amp circuit breaker
(CB8). The 208/230 (Y) voltage transformers use two
primary voltage taps as
shown in figure 2, while
460 (G) and 575 (J)
voltage transformers
use a single primary
voltage tap.
3-Contactor Transformer T18
T18 is asingle line voltage to 24VAC transformer used in
all LCM 13 to 25 ton units. Transformer T18 is protected
by a 3.5 amp circuit breaker (CB18). T18 is identical to trans
former T1. The transformer supplies 24VAC power to the
contactors.
FIGURE 2
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
208/230V TRANSFORMER
Page 19
FIGURE 3
M4 (A55) A178 T1 T18 A96 K203K202 K3 F10 K1 K191 K2 K14 K146 K65 K231
K9
T59
(G volt
)
T5
(G volt)
VSC Inverter
ELECTRIC HEAT SECTION ELECTRIC HEAT SECTION
4-Terminal Block TB13
TB13 terminal block distributes line voltage power to the
line voltage items in the unit.
5-Outdoor Fan Motor Fuse Block & Fuses F10
Power Exhaust Fan Motor Fuse Block and
Fuses F6.
STD SCCR 240V, 300V and higher rated SCCR units have
three line voltage fuses F10 provide overcurrent protec
tion to all condenser fans. Two line voltage fuses F6 pro
vide overcurrent protection to the two optional power ex
haust fans. The fuses are rated at 30A in all 208/230V
units but 10A in the 208/230V 240U and 300U models.
6-Compressor Contactor K1, K2, K14, K146
K1, K2, K14: All units
K146: 210, 240, 300
All compressor contactors are three‐pole‐double‐break
contactors with 24VAC coils. K1 and K2 (energized by A55)
energizes compressors B1 and B2 in response to first stage
cool demand. In 180 units K14 (energized by A178) ener
gizes B13 in response to second stage cool demand. In
210, 240 and 300 units K14 and K146 (energized by A178)
energize compressors B13 and B20 in response to second
stage cool demand.
7-Blower Contactor K3
Blower contactor K3, used in all units, is a three‐pole‐double‐
break contactor with a 24VAC coil used to energize the indoor
blower motor B3 in response to blower demand. K3 is ener
gized by Unit Controller (A55). Optional Staged-Blower units
which are not equipped with a bypass option will not have a K3.
8-Ultraviolet Germicidal Lamp (UVC) Trans
former T49
UVC transformer T49 is used by units of all voltages except
208/230V and 575V which are equipped with a UVC. The
auto voltage to 230VAC transformer is installed in the con
trol box. The transformer has an output rating of 0.5 amps.
T49 transformer supplies 230VAC power to the UVC lamp.
Page 20
9-Power Exhaust Relay K65 & K231 (PED
units)
Power exhaust relays K65 and K231 are N.O. DPDT relays
with a 24VAC coil. The relay are used in units equipped with
the optional power exhaust dampers. K65 and K231 are
energized by the A55 Unit Controller, after the economizer
dampers reach 50% open (adjustable in ECTO). When K65
closes, exhaust fan B10 is energized and when K231 clos
es B11 is energized.
10-Variable Frequency Drive A96 (optional)
Staged-Blower units are equipped with a VFD which alters
the supply power frequency and voltage to the blower mo
tor. Blower speed is staged depending on the compressor
stages, heating demand, ventilation demand, or smoke
alarm. The amount of airflow for each stage is preset from
the factory. Airflow can be adjusted by changing ECTO pa
rameters in the A55 Unit Controller. The VFD is located be
low the Unit Controller.
11-VFD Power To Motor Contactor K202
(optional)
Contactor is used in Staged-Blower units equipped with a
VFD bypass option. The three‐pole 40 amp contactor with a
24VAC coil is energized by the A55 Unit Controller. K202 al
lows power from the VFD to the B3 blower motor in response
to blower demand.
12-Inverter Start Forward Rotation Relay K203
(optional)
Relay is used in optional Staged-Blower units and is a
three-pole double-throw relay with a 24VAC coil. K203 is
energized by the A55 Unit Controller and provides input to
the A96 VFD to start blower forward rotation. K203 also de-
energizes K3 allowing A96 to control B3 blower.
13-Unit Controller A55
The Unit Controller provides all unit control functions, unit
status information, unit diagnostics, programmable pa
rameters and USB verification and profile sharing. Refer
to the Unit Controller guide provided with the unit. Thermo
stat wires are connected to J297 on the Unit Controller.
14-Compressor 3 & 4 Controller A59 & A178
The compressor 3 & 4 control module A59 controls two ad
ditional compressor stages. A59 includes all inputs and
outputs required for compressor and fan control, compres
sor stage diagnostics and low ambient control.
The M3 unit controller is only compatible with L-Connection
sensors provided with the unit or purchased separately as
specified in the Product Specification. Tables 1 through 4
show thermistor and pressure transducer readings.
Temperature Sensors
The return air (RT16) and discharge air (RT6) duct probes
and the outdoor air (RT17) are all two wire thermistors. The
resistance vs. temperature table is shown below:
Table 1
Resistance vs. Temperature
Temp. °F (°C) Resistance +/-2% Temperature °F
(°C) Resistance +/-2% Temp. °F (°C) Resistance +/-2%
-40 (-40) 335,671 40 (4.4) 26,106 90 (32.2) 7,332
-20 (-28.9) 164,959 50 (10) 19,904 100 (37.8) 5,826
0 (-17.8) 85,323 60 (15.6) 15,313 120 (48.9) 3,756
20 (-6.7) 46,218 70 (21.1) 11,884 130 (54.4) 3,047
30 (-1.1) 34,566 80 (26.7) 9,298
Room Sensors
Room sensor (A2) is a two-wire thermistor with 1k series resistor.
Table 2
Two-Wire Thermistor
Temp. °F (°C) Resistance +/-2% Temperature °F
(°C) Resistance +/-2% Temp. °F (°C) Resistance +/-2%
40 (4.4) 27,102 60 (15.6) 16,313 80 (26.7) 10,299
45 (7.2) 23,764 65 (18.3) 14,474 85 (29.4) 9,249
50 (10) 20,898 70 (21.1) 12,882 90 (32.2) 8,529
55 (12.8) 18,433 75 (23.9) 11,498
Carbon Dioxide Sensor
The indoor carbon dioxide sensor (A63) is an analog sensor with a 0-10VDC output over a carbon dioxide range of 0-2000
ppm as shown in the following table. The sensor is powered with 24VAC.
Table 3
Carbon Dioxide Range
Carbon Dioxide
PPM
DC
V
Carbon Dioxide
PPM DC Voltage Carbon Dioxide
PPM DC Voltage Carbon Dioxide
PPM
DC
V
0 0 600 3 1200 6 1800 9
200 1 800 4 1400 7 2000 10
400 2 1000 5 1600 8
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