Lennox ELS SERIES Installation and operation manual

Page 1
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.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
WARNING
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
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.
Table of Contents
Unit Plumbing Parts Arrangement .................................5
Model Number Identication ........................................10
Unit Control Box Components Arrangement ................ 11
I-UNIT COMPONENTS ................................................12
A-CONTROL BOX COMPONENTS ............................12
B-COOLING COMPONENTS.......................................12
II- REFRIGERANT SYSTEM .......................................13
A-Plumbing ..................................................................13
B-Service Valves .........................................................14
III-START-UP................................................................15
IV-CHARGING..............................................................16
A-Leak Testing..............................................................16
B-Evacuating the System .............................................17
C-Charging ...................................................................18
V-MAINTENANCE ........................................................22
VI-Wiring Diagram and Sequence of Operation ...........23
ELS
6 - 20 TON
Service Literature
UNIT INFORMATION
Corp. 1811-L3
May 15, 2018
ELS SERIES UNITS
The ELS units are designed for light commercial applica-
tions, with a remotely located blower-coil unit or a furnace
with an add-on evaporator coil. Capacities for the series
are 6, 7-1/2, 10, 12.5, 15 and 20 tons (21, 26, 35, 44,
53, and 70 kW).ELS072, ELS090 and ELS120S4S mod-
els have one dual-speed scroll compressor. ELS120S4D,
ELS150S4D, ELS180S4D and ELS240S4D models have
two single-speed scroll compressors. ELS units match
with the ELA blower-coil units. All ELS units are three
phase and use HFC-410A refrigerant.
This manual covers ELS072S4S, ELS090S4S,
ELS120S4S, ELS120S4D, ELS150S4D, ELS180S4D and
ELS240S4D units. It is divided into sections which discuss
the major components, refrigerant system, charging pro-
cedure, maintenance and operation sequence.
Information in this manual is intended for qualied service
technicians only. All specications are subject to change.
Procedures in this manual are presented as a recommen-
dation only and do not supersede or replace local or state
codes.

Page 2
SPECIFICATIONS - 6 - 7.5 TON
General
Data
Model No. ELS072S4S ELS090S4S
Nominal Size - Tons
67
.5
Connections
(sweat)
Liquid line - in. (o.d) (1)3/8 (1)5/8
Suction line - in. (o.d) (1)1-1/8 (1)1-1/8
Refrigerant
(R-410A)
Factory Charge R-410A holding charge (2 lbs. per stage)
1Field charge (25 ft. line set) 18 lbs. 0 oz.20 lbs. 0 oz.
Compressor (1) Two-Stage Scroll (1)Two-Stage Scroll
Condenser
Coil
Net face area - sq. ft. Outer coil 29.
32
9.3
Inner coil 14.2 28.4
Tube diameter - in. & no. of rows 3/8 - 1.
53
/8 - 2
Fins per inch 20 20
Condenser
Fan(s)
Diameter - in. & no. of blades (1) 24 -
3(
1) 24 - 4
Motor hp (1)1/3 (1)1/2
Total air volume - cfm 4700 5600
Rpm 1075 1075
Watts 400 580
ELECTRICAL DATA
Line voltage data - 60 hz - 3 phase 208/230V 460V 575V 208/230V 460V 575V
2Maximum Overcurrent Protection (amps) 40 15 15 60 25 20
3Minimum circuit ampacity 24 12 9371
71
3
Compressor No. of Compressors 111111
Rated load amps 17.6 8.56.3 26.9 12 9
Locked rotor amps 136 66 55 1659
46
5
Condenser
Fan Motor
(1 phase)
No. of motors 111111
Full load amps 1.7 0.81 31.5 1.2
Locked rotor amps 4.3 2.41.9 63
2.9
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
1Field provided charge with 25 ft. line set. Refer to the Lennox Refrigerant Piping Manual to determine refrigerant charge required with longer length refrigerant lines.
2HACR type circuit breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
SPECIFICATIONS - 10 TON
General
Data
Model No. ELS120S4S ELS120S4D
Nominal Size - Tons 10 10
Connections
(sweat)
Liquid line - in. (o.d) (1)5/8 (2)3/8
Suction line - in. (o.d) (1)1-1/8 (2)1-1/8
Refrigerant
(R-410A)
Factory Charge R-410A holding charge (2 lbs. per stage)
1Field charge
(25 ft. line set)
Circuit 1 32 lbs. 0 oz. 12 lbs. 0 oz.
Circuit 2-- - 12 lbs. 0 oz.
Compressor (1) Two-Stage Scroll (2)Single-Stage Scroll
Condenser
Coil
Net face area - sq. ft. Outer coil 29.3 29.3
Inner coil 28.4 28.4
Tube diameter - in. & no. of rows 3/8 -
23
/8 - 2
Fins per inch 20 20
Condenser
Fan(s)
Diameter - in. & no. of blades (2) 24 -
3(
2) 24 - 3
Motor hp (2)1/3 (2)1/3
Total air volume - cfm 8300 8300
Rpm 1075 1075
Watts 830 830
ELECTRICAL DATA
Line voltage data - 60 hz - 3 phase 208/230V 460V 575V 208/230V 460V 575V
2Maximum Overcurrent Protection (amps) 80 30 25 40 20 15
3Minimum circuit ampacity 47 21 16 30 16 13
Compressor No. of Compressors 1112
22
Rated load amps (total) 34.6 14.8 11.1 12 (24) 6.3 (12.6) 4.9 (9.8)
Locked rotor amps (total) 240 13094 90 (180) 60 (120) 41 (82)
Condenser
Fan Motor
(1 phase)
No. of motors 222222
Full load amps (total) 1.7 (3.4) 0.8 (1.6)1(2)1.7 (3.4)0.8 (1.6)1(2)
Locked rotor amps (total) 4.3 (8.6) 2.4 (4.8)1.9 (3.8)4.3 (8.6)2.4 (4.8)1.9 (3.8)
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
1Field provided charge with 25 ft. line set. Refer to the Lennox Refrigerant Piping Manual to determine refrigerant charge required with longer length refrigerant lines.
2HACR type circuit breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 3
SPECIFICATIONS - 12.5 - 20 TON
General
Data
Model No. ELS150S4D ELS180S4D ELS240S4D
Nominal Size - Tons 12.51
52
0
Connections
(sweat)
Liquid line - in. (o.d) (2)3/8 (2)5/8 (2)5/8
Suction line - in. (o.d) (2)1-1/8 (2)1-1/8 (2)1-1/8
Refrigerant
(R-410A)
Factory Charge R-410A holding charge (2 lbs. per stage)
1Field charge
(25 ft. line set)
Circuit 1 15 lbs. 0 oz. 24 lbs. 0 oz.22 lbs. 4 oz.
Circuit 2 15 lbs. 0 oz. 24 lbs. 0 oz.23 lbs. 3 oz.
Compressor (2) Single-Stage Scroll (2)Single-Stage Scroll (2)Single-Stage Scroll
Condenser
Coil
Net face area - sq. ft. Outer coil 34.2 58.7 58.7
Inner coil 33.3 57.7 57.7
Tube diameter - in. & no. of rows 3/8 - 23/8 -
23
/8 - 2
Fins per inch 20 20 20
Condenser
Fan(s)
Diameter - in. & no. of blades (2)24 - 4(4) 24 - 3(4) 24 - 3
Motor hp (2)1/2 (4)1/3 (4)1/3
Total air volume - cfm 10,300 16,600 16,600
Rpm 1075 1075 1075
Watts 1130 1660 1660
ELECTRICAL DATA
Line voltage data - 60 hz - 3 phase 208/230V 460V 575V 208/230V 460V 575V 208/230V 460V 575V
2Maximum Overcurrent Protection (amps) 60 25 25 80 40 30 90 50 40
3Minimum circuit ampacity 50 21 20 63 31 25 70 36 30
Compressor No. of Compressors 222222222
Rated load amps
(total)
19.6
(39.2)
8.2
(16.4)
6.6
(13.2)
25
(50)
12.2
(24.4)
9
(18)
28.2
(56.4)
14.7
(29.4)
11.3
(22.6)
Locked rotor amps
(total)
136
(272)
66
(132)
55
(110)
164
(328)
100
(200)
78
(156)
240
(480)
130
(260)
93.7
(187.4)
Condenser
Fan Motor
(1 phase)
No. of motors 222444444
Full load amps
(total)
3
(6)
1.5
(3)
1.2
(2.4)
1.7
(6.8)
0.8
(3.2)
1
(4)
1.7
(6.8)
0.8
(3.2)
1
(4)
Locked rotor amps
(total)
6
(12)
3
(6)
2.9
(5.8)
4.3
(17.2)
2.4
(9.6)
1.9
(7.6)
4.3
(17.2)
2.4
(9.6)
1.9
(7.6)
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
1Field provided charge with 25 ft. line set. Refer to the Lennox Refrigerant Piping Manual to determine refrigerant charge required with longer length refrigerant lines.
2HACR type circuit breaker or fuse.
3Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
WEIGHT DATA
Model No. Ne
tS
hipping
lbs.kglbs
.k
g
072S 318 144 338 153
090S 345 157365 166
120S 452 205 477 216
120D 480 218 505 229
150S 535 243560 254
180S 775 352 800 363
240S 832 377 857 389
OPTIONS / ACCESSORIES
COMBINED COIL/HAIL GUARDS
T2GARD20L-1 40 18 45 20
T2GARD20M-1 45 20 50 23
T2GARD21M-1 45 20 50 23
T2GARD20N-1- 90 41 10
04
5

Page 4
OPTIONS / ACCESSORIES
Item Catalog
No.
ELS
072
S4S
ELS
090
S4S
ELS
120
S4S
ELS
120
S4D
ELS
150
S4D
ELS
180
S4D
ELS
240
S4D
CABINET
Combined Coil/Hail Guards
T2GARD51L-1 13T29 XX
T2GARD51M11 13T30 XX
T2GARD51M21 13T32 X
T2GARD51N-1 13T37
XX
Corrosion Protection
Factory
OOOOOOO
CONTROLS
BACnet®Module A0CTRL31LS1 17A08
XXXXXXX
BACnet®Sensor with Display K0SNSR01FF1 97W23
XXXXXXX
BACnet®Sensor without Display K0SNSR00FF1 97W24
XXXXXXX
Network Thermostat Control (NTC) C0CTRL07AE1L 17M10 XXXXXXX
NTC Enclosure Kit (required with NTC Controller) A0CTRL32LS1 16H99
XXXXXXX
L Connection®Building Automation System - - - X
XXXXXX
Low
Ambient Control (0ºF) A2CWKT01LM1- 16F18 XX
A2CWKT04M-1- 16F26 X
A2CWKT02M-1- 16F24 XX
A2CWKT03N-1- 16F25
XX
ELECTRICAL
GFI
Service
Outlets
(208/230V, 460V only) LTAGFIK10/15/15
74M70
XXXXXXX
67E01
XXXXXXX
INDOOR AIR QUALITY
Sensor - Wall-mount, off-white plastic cover with LCD display C0SNSR50AE1L 77N39
XXXXXXX
Sensor - Wall-mount, off-white plastic cover, no display C0SNSR52AE1L 87N53
XXXXXXX
Sensor - Black plastic case with LCD display, rated for
plenum mounting
C0SNSR51AE1L 87N52
XXXXXXX
Sensor - Wall-mount, black plastic case, no display, rated for
plenum mounting
C0SNSR53AE1L 87N54
XXXXXXX
CO2Sensor Duct Mounting Kit C0MISC19AE1- 85L43
XXXXXXX
Aspiration Box - for duct mounting non-plenum rated CO2
sensor (77N39)
C0MISC16AE1- 90N43
XXXXXXX
O - Factory Installed with extended lead time.
X - Field Installed

Page 5
Unit Plumbing Parts Arrangement
ELS072S4S
ELS090S4S

Page 6
ELS120S4S
ELS120S4D – STAGE 2

Page 7
ELS120S4D – STAGE 1
ELS150S4D – STAGE 2

Page 8
ELS150S4D – STAGE 1
ELS180S4D – STAGE 2

Page 9
ELS180S4D – STAGE 1
ELS240S4D – STAGE 2

Page 10
ELS240S4D – STAGE 1
Model Number Identication
ELSY1120 S S4 D
Brand/Family
Elite™ Product Line
S = Split System Air Conditioner
Nominal Cooling Capacity -
Tons
072 = 6 Tons
090 = 7.5 Tons
120 = 10 Tons
150 = 12.5 Tons
180 = 15 Tons
240 = 20 Tons
Cooling Efficiency
S = Standard Efficiency
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
Voltage
Y = 208/230V‐3 phase‐60hz
G = 460V‐3 phase‐60hz
J = 575V‐3 phase‐60hz
M = 380/420V‐3 phase‐50hz
Refrigerant Type
4 = R-410A
Refrigerant Circuits
S = Single Circuit
D = Dual Circuits
Part Load Capability
S = Single Stage Compressor
T = Two Stage Compressor

Page 11
Unit Control Box Components Arrangement
ELS072/090S ELS120S
ELS120D/ELS150D ELS180D / ELS240D
TRANSFORMER
TRANSFORMER
TRANSFORMER
TRANSFORMER
CONTACTOR
CONTACTOR
ICM CONTROLLER
(FIELD INSTALLED)
ICM CONTROLLER
(FIELD INSTALLED)
ICM CONTROLLER
(FIELD INSTALLED)
ICM CONTROLLER
(FIELD INSTALLED)

Page 12
I-UNIT COMPONENTS
The ELS parts arrangements are shown on pages 5 - 10
and control boxes on page 11.
WARNING
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge
by putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools
on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
A-CONTROL BOX COMPONENTS
1 - Transformer T1 & T18
All ELS models use a single line voltage to 24VAC trans-
former mounted in the control box. Transformer T1 sup-
plies power to control circuits in the ELS unit. The trans-
former is rated at 70VA and is protected by a 3.5 amp
circuit breaker (CB8). CB8 is internal to the transformer.
The 208/230 (Y) voltage transformers use two primary
voltage taps as shown in gure 1, while 460 (G) and 575
(J) voltage transformers use a single primary voltage tap.
T18 is identical to T1 used in ELS120, 150, 180 and 240
and is protected by internal circuit breaker CB18.
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
208/230V TRANSFORMER
FIGURE 1
NOTE – 208 volt units are eld wired with the red wire
connected to control transformer. 230 volt units are factory
wired with the orange wire connected to control transfo-
mer primary.
2 - Terminal Strip TB14 & TB2
Terminal strip TB14 used in all units distributes 24V power
and common from the transformer T18 to the control box
components. Terminal block TB2 used in the 120, 150,
180 and 240 units, distributes line voltage to line voltage
components.
3 - Condenser Fan Capacitors C1, C2, C18, C19
All ELS units use single-phase condenser fan motors. Mo-
tors are equipped with a fan run capacitor to maximize
motor efciency. Condenser fan capacitors C1, C2, C18
and C19 assist in the start up of condenser fan motors B4,
B5, B21 and B22. Capacitor ratings will be on condenser
fan motor nameplate.
4 - Compressor Contactor K1 (all units) K2 (120S4D,
150, 180, 240)
All compressor contactors are three-pole double-break
contactors with auxiliary switch with a 24V coil. In
ELS072, 090 and 120S4S, K1 energizes compressor B1.
In ELS120S4D, 150, 180 and 240 units, K1 and K2 ener-
gize compressors B1 and B2.
5 - Condenser Fan Relay K10 (all units) K149 (180, 240)
Condenser fan relays K10 and K149 are DPDT with a 24V
coil. In all units K10 energizes condenser fan B4 (fan 1) in
response to thermostat demand. In the ELS120S4D, 150,
180 and 240, K10 also energizes condenser fan B5 (fan 2)
In the ELS180 and 240 K149 energizes condenser fans B21
(fan 3) and B22 (fan 4) in response to thermostat demand.
6 - Cooling Relays K66 (120S4D, 150, 180, 240) & K67
(all units)
Cooling relays K66 and K67 are N.O. DPDT relays. K66
is energized from ”Y1” (1st stage cool), which in turn en-
ergizes contactor K2. K67 is energized by ”Y2” (2nd stage
cool), which in turn energizes contactor K1. This sequence
is the start up of compressors B1 and B2.
B-COOLING COMPONENTS
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
1 - Compressor
ALL ELS model units use scroll compressors. ELS072,
ELS090 and ELS120S4S models have one two-stage scroll
compressor. ELS120S4D, ELS150S4D, ELS180S4D and
ELS240S4D models have two single-stage scroll com-
pressors.
Compressor consists of two involute spiral scrolls matched
together to generate a series of crescent shaped gas
pockets between them.
During compression, one scroll remains stationary while
the other scroll orbits around it.
Gas is drawn into the outer pocket, the pocket is sealed as
the scroll rotates.
As the spiral movement continues, gas pockets are
pushed to the center of the scrolls. Volume between the
pockets is simultaneously reduced.
When pocket reaches the center, gas is now high pres-
sure and is forced out of a port located in the center of the
xed scrolls.
During compression, several pockets are compressed si-
multaneously resulting in a smooth continuous compres-
sion cycle.
Continuous ank contact, maintained by centrifugal force,
minimizes gas leakage and maximizes efciency.
Scroll compressor is tolerant to the effects of slugging and
contaminants. If this occurs, scrolls separate, allowing liq-
uid or contaminants to be worked toward the center and
discharged.

Page 13
Low gas pulses during compression reduces operational
sound levels.
Compressor motor is internally protected from excessive
current and temperature.
Compressor is installed in the unit on resilient rubber
mounts for vibration free operation.
Compressor B1 operates during all cooling demand and
is energized by contactor K1 upon receiving rst stage de-
mand. Compressor B2 operates only during second stage
cooling demand, and is energized by contactor K2. See
ELECTRICAL section or compressor nameplate for com-
pressor specications.
ELS072, ELS090 and ELS120S4S Two Stage Models
A 24-volt DC solenoid valve inside the compressor controls
staging. When the 3-way solenoid is energized it moves
the lift ring assembly to block the ports and the compressor
operates at full-load or 100% capacity. When the solenoid
is de-energized the lift ring assembly moves to unblock the
compressor ports and the compressor operates at part-
load or approximately 67% of its full-load capacity.
The “loading” and “unloading” of the two stage scroll is
done “on the y” without shutting off the single-speed
compressor motor between stages.
FIGURE 2. Two-Stage Scroll Compressor
2 - Crankcase Heaters HR1 (all units) and HR2
(120S4D, 150, 180, 240)
All ELS series units use a belly-band type crankcase heat-
er. Heater HR1 is wrapped around compressor B1 and
heater HR2 is wrapped around compressor B2. HR1 and
HR2 assure proper compressor lubrication at all times.
3 - High Pressure Switch S4 (all units) & S7 (120S4D,
150, 180, 240)
The high pressure switch is a manual-reset SPST N.C.
switch which opens on a pressure rise. The switch is lo-
cated in the compressor discharge line and is wired in se-
ries with the compressor contactor coil. When discharge
pressure rises to 640 + 10 psig (4413 + 69 kP ) the switch
opens and the compressor is de-energized.
4 - Filter Drier (all units)
All ELS model units have a lter drier that is located in the
liquid line of each refrigerant circuit at the exit of each con-
denser coil. The drier removes contaminants and moisture
from the system.
5 - Condenser Fan B4 (all units) B5 (120S4S,120S4D,
150, 180, 240) B21 & B22 (180, 240)
See pages 2 and 3 for the specications on the condens-
er fans used in the ELS units. All condenser fans have
single- phase motors. The ELS072 and 090 units are
equipped with a single condenser fan. The ELS120 and
150 are equipped with two fans and the 180 and 240 have
four fans. The fan assembly may be removed for servicing
by removing the fan grill, unplugging the motor then loos-
ening the motor bracket. The assembly will lift out.
6 - Loss of Charge Switch S24 & S25
The loss of charge switch is an auto-reset SPST N.C.
switch which opens on a pressure drop (almost a complete
loss of charge). All ELS units have S24 and the 120S4D
through 240 have S25. The switch is located in the liquid
line and wired in series with compressor contactor and
high pressure switch. S24 is wired in series with rst stage
cool and S25 is wired in series with second stage cool.
When pressure drops below 40+ 5 psig (indicating loss of
charge in the system) the switch opens and compressor
is de-energized. The switch automatically resets when re-
frigerant is added and pressure in the discharge line rises
above 90+ 5 psig.
7 - Head Pressure Control A190 & A191 and Pressure
Transducer A188 & A189
The low ambient kit is designed to maintain the head pres-
sure across the liquid line by varying the condenser speed
fan.
Head pressure Control A190 (all units) and A191 (ELS180,
240) is used to set the desired liquid line pressure (315
psig in ELS units). The pressure transducer A190 (All
units) A191 (120S4D through 240) measures the liquid
line pressure sending an analog signal to the head pres-
sure controller. If pressure falls below set point, the head
pressure controller reduces the fan speed to increase the
liquid line pressure to the set point.
II- REFRIGERANT SYSTEM
A-Plumbing
Field refrigerant piping consists of liquid and suction lines
connecting the condensing unit and the indoor unit. Liquid
and suction service valves are located in a compartment
at the corner of the unit below the control box. Piping can
be routed directly from the service valves or eld supplied
elbows can be added to divert the piping as required Refer
to table 1 for eld-fabricated refrigerant line sizes for runs
up to 50 linear feet (15 m).
TABLE 1
ELS Unit Liquid Line Suction Line
072 3/8" (10mm) 1-1/8" (29mm)
090 5/8" (16mm) 1-1/8" (29mm)
120S4S 5/8" (16mm) 1-1/8" (29mm)
120S4D 3/8" (10mm) 1-1/8" (29mm)
150 3/8" (10mm) 1-1/8" (29mm)
180 5/8" (16mm) 1-1/8" (29mm)
240 5/8" (16mm) 1-1/8" (29mm)

Page 14
Refrigerant Line Limitations
You may install the unit in applications that have line set
lengths of up to 50 linear feet (15 m) with refrigerant line
sizes as outlined in table 1 (excluding equivalent length of
ttings). Size refrigerant lines greater than 50 linear feet
(15m or greater) according to the Lennox Refrigerant Pip-
ing Design and Fabrication Guidelines (Corp. 9351-L9) or
latest version.
B-Service Valves
OPERATING SERVICE VALVES
The liquid and suction line service valves are typically
used for removing refrigerant, ushing, leak testing, evac-
uating, checking charge and charging.
IMPORTANT
Only use Allen wrenches of sufcient hardness (50Rc
- Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory-torqued (from 9 ft-lbs
for small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding
or breaking off the wrench, or stripping the valve stem
recess.
Each valve is equipped with a service port which has a
factory-installed valve stem.
1
2
3
4
5
6
7
8
9
10
11 12
1/6 TURN
1
2
3
4
5
6
7
8
9
10
11 12
1/12 TURN
Cap Tightening Distances
FIGURE 3
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and tted
snugly over the cap before tightening.
TABLE 2
Torque Requirements
Part Recommended Torque
Service valve cap 8 ft.-lb. 11 NM
Sheet metal screws 16 in.-lb. 2 NM
Machine screws #10 28 in.-lb. 3 NM
Compressor bolts 90 in.-lb. 10 NM
Gauge port seal cap 8 ft.-lb. 11 NM
To Access Angle-Type Service Port:
A service port cap protects the service port core from con-
tamination and serves as the primary leak seal.
1 - Remove service port cap with an appropriately
sized wrench.
2 - Connect gauge to the service port.
3 - When testing is completed, replace service port cap
and tighten as follows:
• With Torque Wrench: Finger tighten and then tight-
en per table 2.
• Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/6
turn clockwise as illustrated in gure 2.
To Open Liquid Line Service Valve:
1 - Remove stem cap with an adjustable wrench.
2 - Using service wrench and 5/16" hex head extension
if needed (part #49A71) back the stem out
counterclockwise until the valve stem just touches
the retaining ring.
3 - Replace stem cap. Tighten nger tight, then tighten
an additional 1/6 turn. Do not over torque.
To Close Liquid Line Service Valve:
1 - Remove stem cap with an adjustable wrench.
2 - Using service wrench and 5/16" hex head extension
if needed (part #49A71), turn stem clockwise to seat
the valve. Tighten rmly.
3 - Replace stem cap. Tighten nger tight, then tighten
an additional 1/6 turn. Do not over torque.
Service (Ball) Valve
Some ELS units are equipped with a full service ball valve,
as shown in gure 4. One service port that contains a
valve core is present in this valve. A cap is also provided
to seal off the service port. The valve is not rebuildable so
it must always be replaced if failure has occurred.
Opening the Suction Line Service Valve
1 - Remove the stem cap with an adjustable wrench.
2 - Using a service wrench, turn the stem
counterclockwise for 1/4 of a turn.
3 - Replace the stem cap and tighten it rmly.
Closing the Suction Line Service Valve
1 - Remove the stem cap with an adjustable wrench.
2 - Using a service wrench, turn the stem clockwise for
1/4 of a turn.
3 - Replace the stem cap and tighten rmly.

Page 15
Liquid And Suction Line Service Valve
(Valve Open)
Schrader
valve
service
port
service port
cap
insert hex
wrench here
to indoor coil
to outdoor coil
stem cap
Schrader valve open
to line set when valve
is closed (front seated)
service
port
service
port cap
stem cap
insert hex
wrench here
Liquid And Suction Line Service Valve
(Valve Closed)
(valve front seated)
to outdoor coil
to indoor coil
FIGURE 4
SUCTION LINE (BALL TYPE) SERVICE VALVE
VALVE CORE
SERVICE PORT
STEM CAP
STEM
USE ADJUSTABLE WRENCH
ROTATE STEM CLOCKWISE 90 TO CLOSE
ROTATE STEM COUNTERCLOCKWISE 90 TO OPEN
BALL
(SHOWN OPEN)
FROM INDOOR COIL
TO COMPRESSOR
SERVICE PORT
CAP
FIGURE 5
III-START-UP
The following is a general procedure and does not apply
to all thermostat control systems. Refer to sequence of
operation in this manual for more information.
IMPORTANT
Crankcase heaters must be energized for 24 hours before
attempting to start compressors. Set thermostat so there
is no compressor demand before closing disconnect
switch. Attempting to start compressors during the 24-
hour warm-up period could result in damage or failed
compressors.
1 - Set fan switch to AUTO or ON and move the system
selection switch to COOL. Adjust the thermostat to a
setting far enough below room temperature to bring
on compressors. Compressors will start and cycle
on demand from the thermostat (allowing for unit
and thermostat time delays).
2 - Each circuit is eld charged with HCFC-410A
refrigerant.
3 - Refer to Charging section for proper method of
checking and charging the system.
IMPORTANT
Three-phase scroll compressors must be phased
sequentially to ensure correct compressor rotation
and operation. At compressor start-up, a rise in
discharge and drop in suction pressures indicate proper
compressor phasing and operation. If discharge and
suctions pressures do not perform normally, follow the
steps below to correctly phase in the unit.
1 - Disconnect power to the unit.
2 - Reverse any two eld power leads (L1 and L3
preferred) to the unit.
3 - Reapply power to the unit.
Discharge and suction pressures should operate at their
normal start-up ranges.
NOTE - Compressor noise level will be signicantly high-
er when phasing is incorrect and the unit will not provide
cooling when compressor is operating backwards. Con-
tinued backward operation will cause the compressor to
cycle on internal protector.

Page 16
IV-CHARGING
A-Leak Testing
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Fire, Explosion and Personal Safety hazard.
Failure to follow this warning could result in
damage, personal injury or death.
Never use oxygen to pressurize or purge
refrigeration lines. Oxygen, when exposed
to a spark or open ame, can cause re and/
or an explosion, that could result in property
damage, personal injury or death.
1 - Connect an HFC-410A manifold gauge set as
illustrated in gure 6.
2 - Open the valve on the HFC-410A cylinder (suction
only).
3 - Open the high pressure side of the manifold to allow
HFC-410A into the line set and indoor unit. Weigh in
a trace amount of HFC-410A. [A trace amount is a
maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure].
4 - Close the valve on the HFC-410A cylinder and the
valve on the high pressure side of the manifold
gauge set.
5 - Disconnect the HFC-410A cylinder.
6 - Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
7 - Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold
gauge set in order to pressurize the line set and the
indoor unit.
8 - After a few minutes, open one of the service valve
ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector.
NOTE - Amounts of refrigerant will vary with line lengths.
9 - Check all joints for leaks.
10 - Purge dry nitrogen and HFC-410A mixture.
11 - Correct any leaks and recheck.
12 - After leak testing, disconnect gauges from service
ports.

Page 17
TO SUCTION
SERVICE VALVE
HFC-410A
MANIFOLD
GAUGE SET
NITROGEN
OUTDOOR UNIT
A
Connect an HFC-410A manifold gauge set high pressure hose to the
suction valve service port.
BWith both manifold valves closed, connect the cylinder of HFC-410A
refrigerant to the center port of the manifold gauge set.
CAfter the line set has been connected to both the indoor and outdoor
units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:
A
B
NOTE - LATER IN THE PROCEDURE, THE HFC-410A CONTAINER WILL BE REPLACE BY THE
NITROGEN CONTAINER.
FIGURE 6
B-Evacuating the System
OUTDOOR UNIT
TO SUCTION
SERVICE VALVE
TO LIQUID
LINE SERVICE
VALVE
MICRON GAUGE
VACUUM PUMP
A34000 1/4 SAE
TEE WITH
SWIVEL
COUPLER
NITROGEN
50
MANIFOLD
GAUGE SET
HFC-410A
RECOMMEND MINIMUM
3/8” HOSE
AConnect low side of manifold gauge set with 1/4 SAE in-line tee to suction line
service valve
BConnect high side of manifold gauge set to liquid line service valve
CConnect micron gauge available connector on the 1/4 SAE in-line tee.
DConnect the vacuum pump (with vacuum gauge) to the center port of the
manifold gauge set. The center port line will be used later for both the
HFC-410A and nitrogen containers.
A
B
C
D
NOTE - Remove cores from service valves if not already done.
FIGURE 7

Page 18
WARNING
Possible equipment damage.
Avoid deep vacuum operation. Do not use compressors
to evacuate a system. Extremely low vacuum can cause
internal arcing and compressor failure. Damage caused
by deep vacuum operation will void warranty.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables are de-
ned as any gas that will not condense under tempera-
tures and pressures present during operation of an air
conditioning system. Non-condensables and water suc-
tion combine with refrigerant to produce substances that
corrode copper piping and compressor parts.
NOTE - Remove cores from service valves if not already
done.
1 - Connect an HFC-410A manifold gauge set as
illustrated in gure 5.
2 - Open both manifold valves and start the vacuum
pump.
3 - Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29 inches of mercury).
NOTE - During the early stages of evacuation, it is desir-
able to close the manifold gauge valve at least once to
determine if there is a rapid rise in pressure this indicates
a relatively large leak. If this occurs, repeat the leak test-
ing procedure.
NOTE - The term absolute pressure means the total ac-
tual pressure within a given volume or system, above the
absolute zero of pressure. Absolute pressure in a vacuum
is equal to atmospheric pressure minus vacuum pressure.
4 - When the absolute pressure reaches 23,000
microns (29 inches of mercury), close the manifold
gauge valves, turn off the vacuum pump and
disconnect the manifold gauge center port hose
from vacuum pump. Attach the manifold center
port hose to a dry nitrogen cylinder with pressure
regulator set to 150 psig (1034 kPa) and purge the
hose. Open the manifold gauge valves to break the
vacuum in the line set and indoor unit. Close the
manifold gauge valves.
5 - Shut off the dry nitrogen cylinder and remove the
manifold gauge hose from the cylinder. Open the
manifold gauge valves to release dry nitrogen from
the line set and indoor unit.
6 - Reconnect the manifold gauge to vacuum pump,
turn pump on, and continue to evacuate line set and
indoor unit until the absolute pressure does not rise
above 500 microns within a 20-minute period after
shutting off vacuum pump and closing the manifold
gauge valves.
7 - When the absolute pressure requirement above has
been met, disconnect the manifold hose from the
vacuum pump and connect it to an upright cylinder
of HFC-410A refrigerant. Open the manifold gauge
valve pressure line set to break vacuum with 2 to
5 psi.
8 - Perform the following:
A - Close manifold gauge valves
B - Shut off HFC-410A cylinder
C - Reinstall service valve cores by removing manifold
hose from service valve. Quickly install cores
with core tool while maintaining a positive system
pressure.
D - Replace the stem caps and secure nger tight, then
tighten an additional one-sixth (1/6) of a turn as
illustrated in gure 2.
C-Charging
ELS units have a factory holding charge of 2 pounds of
HFC-410A in each circuit. Additional refrigerant will need
to be added during installation (table 3).
TABLE 3
Adding Refrigerant
Models
Stage 1
lbs
for 25ft
line set
Stage 2
lbs
for 25ft
line set
Liq.
Line
Dia.
Suction
Line
Dia.
Ounces
Adjustment
per foot of
line set1
ELS072S4S 18.5N/A 3/8 1-1/8 0.7
ELS090S4S 21.75N/A 5/8 1-1/8 1.7
ELS120S4S23N/A 5/8 1-1/8 1.7
ELS120S4D12123/8 1-1/8 0.7
ELS150S4D15 15.53/8 1-1/8 0.7
ELS180S4D 23.75 23.55/8 1-1/8 1.7
ELS240S4D 22.5 23.55/8 1-1/8 1.7
1If line set length is greater than 25 feet, add this amount
to each circuit. If line set is less than 25 feet, subtract this
amount from each circuit. Refer to Lennox Refrigerant
Piping Design and Fabrication Guidelines for more infor-
mation.
NOTE - Refrigerant line sets longer than 200 feet (60 me-
ters) are not recommended. For assistance contact Len-
nox Application Department.
To check the charge, use the following procedure:
1 - Attach gauge manifolds and operate unit in cooling
mode until system stabilizes (approximately ve
minutes). Make sure outdoor air dampers are
closed.
2 - Use a thermometer to accurately measure the
outdoor ambient temperature.
3 - Apply the outdoor temperature to tables 5 and 6 to
determine normal operating pressures.

Page 19
4 - Compare the normal operating pressures to
the pressures obtained from the gauges. Minor
variations in these pressures may be expected due
to differences in installations. Signicant differences
could mean that the system is not properly charged
or that a problem exists with some component in
the system. Correct any system problems before
proceeding.
5 - If discharge pressure is high, remove refrigerant
from the system. If discharge pressure is low, add
refrigerant to the system.
• Add or remove charge in increments.
• Allow the system to stabilize each time refrigerant is
added or removed.
CHARGE VERIFICATION - APPROACH METHOD
Use the following approach method along with the normal
operating pressures to conrm readings.
1 - Using the same thermometer, compare liquid
temperature at service valve to outdoor ambient
temperature.
Approach Temperature = Liquid temperature minus
ambient temperature
2 - Approach temperature should as indicated in table
4 for each stage. An approach temperature greater
than this value indicates an undercharge. An
approach temperature less than this value indicates
an overcharge.
3 - Do not use the approach method if system pressures
do not match pressures in table 5 except when the
outdoor ambient temperature is below 65ºF (18ºC).
The approach method is not valid for grossly over-
or undercharged systems.
TABLE 4
HFC-410A Approach Temperatures
Models Stage
Approach
Temperature
(ºF)
Approach
Temperature
(ºC)
ELS072S4S 1 4.0 2.2
ELS090S4S 1 7.0 3.9
ELS120S4S 1 4.0 2.2
ELS120S4D 1 5.0 2.8
2 5.0 2.8
ELS150S4D 1 7.0 3.9
2 5.0 2.8
ELS180S4D 1 4.0 2.2
2 4.0 2.2
ELS240S4D 1 7.0 3.9
2 8.0 4.4
TABLE 5
HFC-410A Normal Operating Pressures (Liquid ±10 and Suction ±5 psig) (Single-Stage Units)**
Temp* -072S4S -090S4S -120S4S
Liquid Suction Liquid Suction Liquid Suction
65 F (18 C) 245 137 240 128 243 135
75 F (24 C) 283 141 294 130 285 136
85 F (29 C) 327 143 338 131 332 138
95 F (35 C) 377 145 385 133 378 139
105 F (41 C) 426 148 435 135 434 141
115 F (46 C) 484 150 489 136 491 142
125 F (52 C) 540 155 545 140 548 146
STD. CFM 2600 2725 3850
*Temperature of air entering outdoor coil.
**With indoor conditions at 80ºF dry bulb and 67ºF wet bulb temperatures.

Page 20
TABLE 6
HFC-410A Normal Operating Pressures (Liquid ±10 and Suction ±5 psig) (Dual-Stage Units)**
Temp*
-120S4D
STAGE 1
-120S4D
STAGE 2
-150S4D
STAGE 1
-150S4D
STAGE 2
Liquid Suction Liquid Suction Liquid Suction Liquid Suction
65 F (18 C) 244 133 240 133 254 132 254 130
75 F (24 C) 282 136 278 135 291 135 289 133
85 F (29 C) 326 139 322 137 337 138 336 134
95 F (35 C) 373 141 372 138 381 140 382 136
105 F (41 C) 423 142 420 141 432 142 433 139
115 F (46 C) 477 144 476 143 487 144 489 141
125 F (52 C) 534 147 539 145 543 147 550 145
Temp*
-180S4D
STAGE 1
-180S4D
STAGE 2
-240S4D
STAGE 1
-240S4D
STAGE 2
F (C)* Liquid Suction Liquid Suction Liquid Suction Liquid Suction
65 F (18 C) 233 110 236 110 236 129 236 128
75 F (24 C) 274 120 276 119 275 132 275 129
85 F (29 C) 317 128 319 125 321 134 322 131
95 F (35 C) 364 134 366 131 370 137 368 133
105 F (41 C) 418 138 416 132 420 139 425 136
115 F (46 C) 475 141 468 134 477 142 478 139
125 F (52 C) 536 143 529 136 539 146 534 144
STD. CFM 4000 4400
STD. CFM 5150 6975
*Temperature of air entering outdoor coil.
**With indoor conditions at 80ºF dry bulb and 67ºF wet bulb temperatures.
TABLE 7. Approach Temperatures – Residential Matchups
Models Approach Temperature
Outdoor Indoor Stage (ºF) (+/- 1) (ºC) (+/- 0.5)
ELS120S4D (2) CBA27UHE-060 or
(2) CBA38MV-060
1 4 2.2
2 4 2.2
ELS120S4D (2) CH33-62D 1 4 2.2
2 4 2.2
ELS120S4D (2) CH23-068 1 4 2.2
2 4 2.2
ELS120S4D (2) CX35-60C 1 4 2.2
2 4 2.2
ELS120S4D (2) CX35-60D 1 4 2.2
2 4 2.2