LENNOX Elite ELXC Series Air Conditioners Instruction Manual

LENNOX Elite ELXC Series Air Conditioners

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, or service agency.

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.

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
To prevent serious injury or death:

1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector maintenance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the “OFF” position before performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc. away from moving parts.

Shipping and Packing List

Check the unit for shipping damage. If damaged or parts are missing, immediately contact the last shipping carrier.

• 1 – Assembled outdoor unit
• 1 – Installation instructions

Outdoor Unit

Elite Series air conditioners, which will also be referred to in this instruction as the outdoor unit, use HFC-410A re-frigerant. This outdoor unit must be installed with a match-ing indoor unit and line set as outlined in the Elite Series Engineering Handbook.
This outdoor unit is designed for use in thermal expansion valve (TXV) systems only.

Model Number Identification

Unit Dimensions, Corner Weights and Centers of Gravity

EL072XC | EL09 0XC

Model No.

| CORNER WEIGHTS| CENTER OF GRAVITY
AA| BB| CC| DD| EE| FF
lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| in.| mm| in.| mm
EL072XCSS| 66| 30| 73| 33| 97| 44| 82| 37| 23-1/4| 591| 19-1/4| 489
EL090XCSS| 75| 34| 89| 40| 112| 51| 88| 40| 25| 635| 20-1/4| 514

EL120XC | EL15 0XC

Model No.

| CORNER WEIGHTS| CENTER OF GRAVITY
AA| BB| CC| DD| EE| FF
lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| in.| mm| in.| mm
EL120XCSS| 130| 59| 124| 56| 107| 49| 111| 50| 20-1/2| 521| 33-1/2| 851
EL120XCSD| 122| 55| 119| 54| 127| 58| 131| 59| 21| 533| 28-1/2| 724
EL150XCSD| 144| 66| 132| 60| 133| 60| 145| 66| 19| 483| 30| 762

EL180XC | EL24 0XC

Model No.

| CORNER WEIGHTS| CENTER OF GRAVITY
AA| BB| CC| DD| EE| FF
lbs.| kg| lbs.| kg| lbs.| kg| lbs.| kg| in.| mm| in.| mm
EL180XCSD| 181| 82| 177| 81| 215| 98| 221| 100| 29| 737| 38| 965
EL240XCSD| 192| 87| 189| 86| 232| 105| 238| 108| 29| 737| 37-1/2| 953

Unit Plumbing Parts Arrangement

EL072XCSS

EL090XCSS

EL120XCSS

EL120XCSD – STAGE 2

EL120XCSD – STAGE 1

EL150XCSD – STAGE 2

EL150XCSD – STAGE 1

EL180XCSD – STAGE 2

EL180XCSD – STAGE 1

EL240XCSD – STAGE 2

EL240XCSD – STAGE 1

Unit Control Box Components Arrangement

TYPICAL CONTROL BOX PARTS ARRANGEMENT ELITE COOLING MODELS

Rigging the Unit for Lifting
Rig the unit for lifting by attaching four cables to the holes in the base rail of the unit. See figures 1 through 3.

1. Remove protective packaging before rigging the unit for lifting.
2. Connect the rigging to the holes in each corner of the unit’s base.
3. All panels must be in place for rigging.
4. Place a field-provided H-style frame just above the top edge of the unit. The frame must be of adequate strength and length. (An H-style frame will prevent the top of the unit from being damaged.)

Lifting point should be directly above the center of gravity.

Installation Clearances
See Unit Dimensions on page 2 for sizing mounting slab, platforms or supports. Refer to figures 4 through 6 for mandatory installation clearance requirements.

NOTES:

• Clearance to one of the remaining two sides may be 12 in. (305 mm) and the final side may be 6 in. (152 mm).
• A clearance of 24 in. (610 mm) must be maintained be-tween two units.
• 48 in. (1219 mm) clearance required on top of unit.

Line Set

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 field supplied elbows can be added to divert the piping as required.
Refer to table 1 for field-fabricated refrigerant line sizes for runs up to 50 linear feet (15 m).

TABLE 1. Refrigerant Line Sizes for Runs Up to 50 Linear Feet

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 fittings). Size refrigerant lines greater than 50 linear feet (15m or greater) according to the Lennox Refrigerant Piping Design and Fabrication Guidelines (Corp. 9351-L9) or latest version.

Electrical Connections

In the United States, wiring must conform with current lo-cal codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC).

TRANSFORMER – 24V
Use the transformer provided with the air conditioning unit for low-voltage control power (24V, 90VA)
NOTE – The addition of accessories to the system could exceed the 90VA power requirement of the factory-pro-vided transformer. Measure the system’s current and voltage after installation is complete to determine trans-former loading. If loading exceeds the factory-provided transformer capacity, a larger field- provided transformer will need to be installed in the system.

CIRCUIT SIZING AND DISCONNECT SWITCH

Refer to the unit nameplate for minimum circuit ampacity amperage minimum, and maximum fuse or circuit breaker fusible (HACR per NEC). Install power wiring and properly sized disconnect switch.
NOTE — UNITS ARE APPROVED FOR USE ONLY WITH COPPER CONDUCTORS. GROUND UNIT AT DISCONNECT SWITCH OR TO AN EARTH GROUND.

TYPICAL HIGH VOLTAGE POWER SUPPLY CONNECTIONS

INSTALL THERMOSTAT

Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight, drafts or vibrations.

WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be properly grounded in accordance with national and local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.

TYPICAL UNIT CONTROL WIRE CONNECTIONS

A RUN CONTROL WIRES THROUGH RIGHT CUTOUT.
B RUN CONTROL WIRES THROUGH WIRE TIES.
C TIGHTEN WIRE TIE TO SECURE 24VDC CONTROL WIRING.

NOTE

• FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRING) GAUGE PER TABLE ABOVE.
• WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND MAINTAINS SEPARATION OF FIELD INSTALLED LOW AND HIGH VOLTAGE CIRCUITS.
• DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL BOX.

FIGURE 9. Typical Wiring Diagram – Elite Series Air Conditioners

FIGURE 10. Typical Wiring Diagram – Elite Series Air Conditioners

FIGURE 11. Typical Wiring Diagram – Elite Series Air Conditioners

Refrigerant Charge

The ELITE units have a factory holding charge of 2 pounds of HFC-410A in each circuit. Additional refrigerant will need to be added during installation. Charge using the HFC-410A charging information label provided in the unit. The HFC-410A charging information label in the unit applies to Indoor and Outdoor unit with same full load capacity, see table below. For all other unit matches, please contact Lennox Commercial Application department for Charging Procedure Information (form # 508349-01).

Split System Matches

Cooling Unit| Air Handler| Air Handler SCFM
EL072XC| EL072XA| 2600
EL090XC| EL090XA| 2630
EL120XCSS| EL120XA| 3770
EL120XCSD| EL120XA| 4000
EL150XC| EL150XA| 4425
EL180XC| EL180XA| 5275
EL240XC| EL240XA| 7120

System Operation

The outdoor unit and indoor unit cycle on demand from the room thermostat. Refer to interconnect diagram (fig-ures 7 and 8) for demand signals passed from the indoor unit to the outdoor unit.
For details on the outdoor unit component operation based on thermostat demand, refer to tables below.

EL072XC, EL090XC

Thermostat Demand| Input Signals at Terminal Strip²| Compressor Output| Fan
---|---|---|---
(Key Number1)| (TB14)| (B1)| (B4)
STANDBY| R| OFF| OFF
COOLING 1| C1| LOW| ON
COOLING 2| C1+C2| HIGH| ON
Footnotes:

1.  Refer to Component Label or Wiring Diagram for key numbers.

2.  24V input signals measured between one TB14 connection listed and TB14-C connection.

EL120XCSS

EL120XCSS

Thermostat Demand| Input Signals at Terminal Strip²| Compressor Output| ****

Fans

(Key Number¹)| (TB14)| (B1)| (B4)| (B5)
STANDBY| R| OFF| OFF| OFF
COOLING 1| C1| LOW| ON| ON
COOLING 2| C1+C2| HIGH| ON| ON
Footnotes:

1.  Refer to Component Label or Wiring Diagram for key numbers.

2.  24V input signals measured between one TB14 connection listed and TB14-C connection.

EL120XCSD

EL120XCSD

Thermostat Demand| Input Signals at Terminal Strip²| Compressor Output| Fans
(Key Number¹)| (TB14)| (B1)| (B2)| (B4)| (B5)
STANDBY| R| OFF| OFF| OFF| OFF
COOLING 1| C1| LOW| OFF| ON| ON
COOLING 2| C1+C2| LOW| LOW| ON| ON
COOLING 3| C1+C2+C3| HIGH| HIGH| ON| ON
Footnotes:

1.  Refer to Component Label or Wiring Diagram for key numbers.

2.  24V input signals measured between one TB14 connection listed and TB14-C connection.

EL150XC

EL150XC

Thermostat Demand| Input Signals at Terminal Strip²| Compressor Output| Fans
(Key Number¹)| (TB14)| (B1)| (B2)| (B4)| (B5)
STANDBY| R| OFF| OFF| OFF| OFF
COOLING 1| C1| LOW| OFF| ON| OFF
COOLING 2| C1+C2| LOW| LOW| ON| ON
COOLING 3| C1+C2+C3| HIGH| HIGH| ON| ON
Footnotes:

1.  Refer to Component Label or Wiring Diagram for key numbers.

2.  24V input signals measured between one TB14 connection listed and TB14-C connection.

EL180XC, EL240XC

EL180XC, EL240XC

Thermostat Demand| Input Signals at Terminal Strip²| Compressor Output| Fans
(Key Number1)| (TB14)| (B1)| (B2)| (B4)| (B5)| (B21)| (B22)
STANDBY| R| OFF| OFF| OFF| OFF| OFF| OFF
COOLING 1| C1| LOW| OFF| ON| ON| OFF| OFF
COOLING 2| C1+C2| LOW| LOW| ON| ON| ON| ON
COOLING 3| C1+C2+C3| HIGH| HIGH| ON| ON| ON| ON
Footnotes:

1.  Refer to Component Label or Wiring Diagram for key numbers.

2.  24V input signals measured between one TB14 connection listed and TB14-C connection.

HIGH PRESSURE SWITCHES (S4 AND S7)
These units are equipped with a manual reset high pres-sure switch (single- pole, single-throw) which is located on the discharge line. The switch shuts off the compressor when discharge pressure rises above the factory setting. High Pressure (auto reset) – trip at 640 psig; reset at 512 psig.

LOSS OF CHARGE SWITCHES (S24 AND S25)
NOTE – Used on units with two two-stage compressors.
These units are equipped with a loss-of-charge switch that is located in the liquid line. The switch is a SPST, auto-re-set switch that is normally closed. The switch opens at 40 psi and closes at 90 psi.

LOW PRESSURE SWITCH (S87)
NOTE – Used on units with one two-stage compressor.
These units are equipped with a loss-of-charge switch that is located in the liquid line. The switch is a SPST, auto-re-set switch that is normally closed. The switch opens at 40 psi and closes at 90 psi.

Maintenance

At the beginning of each cooling season, the system should be checked as follows:
OUTDOOR UNIT

1. Clean and inspect the condenser coil. You can flush the coil with a water hose.

2. The outdoor fan motor is prelubricated and sealed.
   No further lubrication is necessary.

3. Visually inspect connecting lines and coils for evidence of oil leaks.

4. Check wiring for loose connections.

5. Check for correct voltage at the unit while the unit is operating and while it is off.

6. Check amp-draw of the outdoor fan motor(s).
   Unit nameplate _____ Actual ____

7. Check amp-draw of the compressor(s).
   Unit nameplate
   Compressor #1
   Compressor #2 _____

NOTE – If the owner complains of insufficient cooling, gauge the unit and check the refrigerant charge. Refer to section on refrigerant charging in this instruction.

INDOOR UNIT

1. If necessary, clean the coil.
2. Check connecting lines and coils for evidence of oil leaks.
3. If necessary, check the condensate line and clean it.
4. Clean or change filters.
5. Adjust the blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.
6. On belt drive blowers, check the belt for wear and proper tension.
7. Check all wiring for loose connections.
8. Check for correct voltage at the unit (blower operating).
9. Check amp-draw on blower motor.
   Unit nameplate _____
   Actual ____

Start-Up and Performance Checklist

Job Name Job no. Date Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage  Rated Load Ampacity Compressor Amperage: __

Maximum Fuse or Circuit Breaker       Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)  Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.  Vapor Pressure;

Refrigerant Lines: Leak Checked?         Properly Insulated? Outdoor Fan Checked?

Service Valves: Fully Opened?          Caps Tight? Voltage With Compressor Operating __

Heating Correct?

| SEQUENCE OF OPERATION

Cooling Correct?

| ****

Calibrated?

| THERMOSTAT

Properly Set?

| ****

Level?

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