Advertisement
This EL18XPV outdoor air conditioner with all-aluminum coil is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. For AHRI Certified system match-ups and expanded ratings, visit www.LennoxPros.com. The EL18XPV variable capacity unit may be installed with an S30 iComfort communicating thermostat or a standard 24VAC non-communicating heat pump thermostat. See field wiring diagrams for wiring details. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.
NOTICE!
Charging information is given on the charging procedure sticker on the unit access panel. For more indepth information, consult the Installation and Service Procedures manual on LennoxPros.com or through the Technical Support department at 800-453-6669.
Special procedures are required for cleaning the all-aluminum coil in this unit.
NOTES: Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box. Clearance to one of the other three sides must be 36 in (914 mm). Clearance to one of the remaining two sides may be 12 in. (305mm) and the final side may be 6 in.(152 mm). A clearance of 24 in. (610 mm) must be maintained between two units. 48 in. (1219 mm) clearance required on top of unit.
NOTICE!
Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface.
This unit must be matched with an indoor coil as specified with AHRI. For AHRI Certified system matchups and expanded ratings, visit www.LennoxPros.com
Coils previously charged with HCFC-22 must be flushed.
To prevent personal injury, as well as damage to panels, unit or structure, observe the following: While installing or servicing this unit, carefully stow all removed panels so that the panels will not cause injury to personnel, objects or nearby structures. Also, take care to store panels where they will not be subject to damage (e.g., being bent or scratched). While handling or stowing the panels, consider any weather conditions (especially wind) that may cause panels to be blown around and damaged.
Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Prolonged exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit. This will diminish unit performance and longevity
PLACEMENT
FIGURE 1
SLAB MOUNTING
Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.
FIGURE 2
ELEVATED SLAB MOUNTING USING FEET EXTENDERS
FIGURE 3
STABILIZING UNIT ON UNEVEN SURFACES
FIGURE 4
Unit Stabilizer Bracket Use (field-provided): Always use stabilizers when unit is raised above the factory height.
(Elevated units could become unstable in gusty wind conditions.) Stabilizers may be used on any unit installed on unstable and uneven surfaces.
If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyvinyl ether (PVE) and polyol ester (POE) oils are used in Lennox variable-capacity units charged with HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device and reduce system performance and capacity. Failure to properly flush the system per this instruction and the detailed Installation and Service Procedures manual will void the warranty.
Flush the existing line set per the following instructions. For more information, refer to the Installation and Service
Procedures manual available on LennoxPros.com.
DO NOT attempt to flush and re-use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out).
Polyvinyl ether (PVE) oil is used in the EL18XPV-024 and -036 compressors. For installations For installations of the EL18XPV-024 and -036 units with refrigerant lines or coils previously charged with R410A and POE oil, Lennox recommends flushing the existing lines and coil with R410A refrigerant to remove excess POE oil that may be in the system. The EL18XPV-048 and EL18XPV-060 heat pumps have variable capacity scroll compressors that use POE oil. EL18XPV-048 and 060 units with refrigerant lines or coils previously charged with R410A and POE oil, do not need to be flushed to remove the POE oil.
If a new line set is being installed, size the piping per table 1.
REFRIGERANT LINE SET – INCHES (MM) | |||||
Model | Valve Field Connections | Recommended Line Set | |||
Liquid Line | Vapor Line | Liquid Line | Vapor Line | L15 Line Sets | |
-024 | 3/8 in. (10 mm) | 3/4 in. (19 mm) | 3/8 in. (10 mm) | 3/4 in. (19 mm) | L15-41 15 ft. - 50 ft. (4.6 m - 15 m) |
-036 | 3/8 in. (10 mm) | 7/8 in. (22 mm) | 3/8 in. (10 mm) | 7/8 in. (22 mm) | L15-65 15 ft. - 50 ft. (4.6 m - 15 m) |
-048 | |||||
-060 | 3/8 in. (10 mm) | 1-1/8 in. (28 mm) | 3/8 in. (10 mm) | 1-1/8 in. (28 mm) | Field Fabricated |
NOTE - Some applications may require a field-provided 7/8" to 1-1/8" adapter. |
NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrication Guidelines manual available on LennoxPros.com (Corp. 9351-L9), or contact the Technical Support Department Product Application group for assistance.
NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
When using a high pressure gas such as nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).
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.
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 flame, can cause fire and/ or an explosion, that could result in property damage, personal injury or death.
Polyvinyl ether (PVE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.
The EL18XPV is a variable-capacity cooling system utilizing variable speed compressor technology. With the variable speed compressor and variable pumping capacity, additional consideration must be given to refrigerant piping sizing and application. The guidelines below are to be used exclusively for the EL18XPV systems.
HEAT PUMP SYSTEM (HFC410A)
NOTE – Maximum lifts are dependent on total length, number of elbows, etc. that contribute to total pressure drop.
SUCTION TRAPS
For systems with the outdoor unit 5 - 60 feet above the indoor unit, one trap must be installed at the bottom of the suction riser.
TABLE 2. Standard Refrigerant Line Set – Up to 50 Linear Feet in Length
Inches (mm) | |||||
Valve Size Connections | Recommended Line Sets | ||||
EL18XPV* | Liquid Line | Suction Line | L15 Line Set Model | Line Set Length | Catalog Number |
-024 | 3/8" (10 mm) | 3/4" (19 mm) | L15-41-30 | 30 feet (9.1 m) | 89J60 |
-036 -048 | 3/8" (10 mm) | 7/8" (22 mm) | L15-65-40 | 40 feet (12.2 m) | 89J61 |
L15-65-50 | 50 feet (15.2 m) | 89J62 | |||
-060 | 3/8" (10 mm) | 1-1/8" (29 mm) ** | Field-fabricated |
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may require a field-provided 1-1/8" to 7/8" adapter.
TABLE 3. EL18XPV Line Set Guidelines – 51 to 150 Linear Feet in Length
Model | Maximum Total Equivalent Length (ft) | Maximum Linear (actual) Length (ft) | Maximum Vapor Riser (ft) | Maximum Linear Liquid Lift (ft) | Preferred Vapor Line Sizes for Horizontal Runs | Required Vapor Riser Size |
![]() | 180 | 150 | 60 | 60 | 7/8" | 5/8" |
![]() | 180 | 150 | 60 | 60 | 7/8" | 3/4" |
![]() | 180 | 150 | 60 | 60 | 7/8" | 7/8" |
![]() | 180 | 150 | 60 | 60 | 7/8" | 7/8" |
TABLE 4. Liquid Line Diameter Selection Table
NOTE: Shaded rows indicate rated liquid line size
NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
FIGURE 5
FIGURE 6
Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing vapors or fumes from brazing operations. Perform operations only in well-ventilated areas. Wear gloves and protective goggles or face shield to protect against burns. Wash hands with soap and water after handling brazing alloys and flux.
Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture. Check the high and low pressures before applying heat.
FIGURE 7
This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the EL18XPV Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information. The expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field-provided plenum, install the expansion valve in a manner that will provide access for future field service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit.
FIGURE 8
INDOOR EXPANSION VALVE INSTALLATION
EQUALIZER LINE INSTALLATION
SENSING BULB INSTALLATION
FIGURE 9
FIGURE 10
EVACUATION
In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air handler for low-voltage control power (24VAC - 40 VA minimum)
EL18XPV Thermostat Control Options
The EL18XPV variable capacity units provide two thermostat control options to provide application and installation flexibility.
iComfort S30 Communicating Thermostat Control
The E18XPV variable capacity unit may be installed as a fully communicating iComfort system consisting of iComfort S30 Ultra Smart Communicating Thermostat, an iComfort enabled indoor unit and the EL18XPV variable capacity outdoor unit wired with (4) iComfort communication wires (R, I+, I- and C) connected to the EL18XPV Outdoor Unitary Control.
The EL18XPV variable capacity unit when wired as a fully communicating iComfort system will take full advantage of the advanced diagnostics and control, Wi-Fi accessibility and system operation parameters. Refer to the EL18XPV field wiring diagram for an iComfort S30 communicating thermostat.
Conventional 24VAC Non-Communicating Thermostat Control
The EL18XPV variable capacity unit may be installed using a conventional 24VAC non-communicating two stage heat pump or single stage heat pump thermostat.
NOTE – The conventional 24VAC non-communicating thermostat must have a compressor minimum on time of three minutes to prevent compressor short cycling. The Lennox M30, ComfortSense 7500, ComfortSense 3000 and many other commercially available electronic thermostats provide this feature.
The EL18XPV unit will provide full variable capacity operation when installed with a conventional 24VAC non-communicating two stage heat pump or single stage heat pump thermostat. The EL18XPV outdoor control has advanced control algorithms using the EL18XPV suction pressure sensor to provide true variable capacity operation.
When utilizing a two-stage conventional 24VAC non-communicating heat pump thermostat, six wires are required to control the outdoor unit (R, C, W1, O, Y1 and Y2). Refer to the EL18XPV field wiring diagram for a conventional 24VAC non-communicating 2-stage heat pump thermostat.
When utilizing a single conventional 24VAC non-communicating heat pump thermostat, five wires are required to control the outdoor unit (R, C, W1, O, and Y1) and Y1 is jumpered to Y2 in the outdoor unit. Note that the published performance data is based upon the use of a two-stage thermostat. Refer to the EL18XPV field wiring diagram for a conventional 24VAC non-communicating single-stage thermostat.
EL18XPV Low Voltage Control Wiring Connections
The EL18XPV variable capacity units are provided with (2) RAST 6-Pin connections in the installation instruction bag for connecting the field low voltage control wiring to the EL18XPV harnesses in the low voltage control make-up box. One RAST 6-pin connector is labeled with terminals TST, DF, R, I+, I- and C. The second RAST 6-pin connector is labeled with terminals DS, O, Y1, Y2, L and W.
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.
Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury or death. Use copper wire only with this product.
Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit breaker(s) per Product Specifications bulletin (EHB) and unit rating plate.
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.
EL18XPV Thermostat Control Options
Thermostat Type | Indoor Unit Type | Qty. of Wires to EL18XPV | EL18XPV Terminal Strip Connections | Unit Operation | Field Wiring Diagram |
iComfort S30 Communicating Thermostat | iComfort Comunicating Gas Furnace or Air Handler | 4 | R, I+, I-, C | Fully Communicating Variable Capacity Operation Based Upon Thermostat Demand | Figure 13 |
Conventional 24VAC 2-Stage Cooling Thermostat (non-communicating) | Any Furnace or Air Handler (non-communicating or communicating) | 6 | R, C, W1, O, Y1, Y2 | Full Variable Capacity Operation Controlled by EL18XPV Unitary Control Using Suction Pressure in the Cooling Mode and Liquid Pressure in Heating Mode | Figure 14 |
Conventional 24VAC Single-Stage Cooling Thermostat (non-communicating) | Any Furnace or Air Handler (non-communicating or communicating) | 5 | R, C, W1, O, Y1 (Jumper Y1 to Y2) | Full Variable Capacity Operation Controlled by EL18XPV Unitary Control Using Suction Pressure in the Cooling Mode and Liquid Pressure in the Heating Mode | Figure 14 |
FIGURE 11
2 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 or drafts.
NOTE - 24VAC, Class II circuit connections are made in the control panel.
FIGURE 12
WIRE RUN LENGTH | AWG# | INSULATION TYPE |
LESS THAN 100' (30 METERS) | 18 | TEMPERATURE RATING |
MORE THAN 100' (30 METERS) | 16 | 35ºC MINIMUM. |
ROUTE HIGH VOLTAGE AND GROUND WIRES
Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located on the bottom of the control box. Connect conduit to the control box using a proper conduit fitting. Connect the 208/230 high voltage power supply from the disconnect to the EL18XCV contactor as shown. Connect the ground wire from the power supply to the unit ground lug connection.
FIGURE 13. EL18XPV with iComfort S30 Communicating Thermostat – Field Wiring Diagram
FIGURE 14. Conventional 24VAC Cooling Non-Communicating Thermostat Wiring
Information concerning the outdoor control 7-segment display and push button operations are available on the unit access panel.
Alarm information is provided on the unit access panel.
To initiate the EL18XPV Charge Mode function, install the jumper across the two Charge Mode Pins (CHRG MODE) on the outdoor control. The Charge Mode can be used when charging the system with refrigerant, checking the refrigerant charge, pumping down the system and performing other service procedures that requires outdoor unit operation at 100% capacity.
EL18XPV Charge Mode Operation with a S30 iComfort Communicating Thermostat
Installing a jumper on the Charge Mode Pins will initiate compressor operation and outdoor fan motor at 100% capacity and will provide a signal to the indoor unit to initiate indoor blower operation at the maximum cooling air volume. To exit the charge mode, remove the Charge Mode Jumper. The Charge Mode has a maximum time of 60 minutes and will automatically exit the charge mode after 60 minutes is the charge mode jumper is left in place.
EL18XPV Charge Mode Operation with a Conventional 24VAC Non-Communicating Thermostat
On applications with a conventional 24VAC non-communicating thermostat, the charge mode jumper must be installed on the Charge Mode Pins after providing a Y1 cooling demand to the EL18XPV to initiate the Charge Mode. When using the Charge Mode in the cooling mode, the "O" must also be provided with a 24V signal to place the reversing valve in the cool position. In the heating mode only a Y1 compressor demand is required along with the blower demand for the full cooling air volume. A cooling blower demand must also be provided to initiate blower operation on the cooling speed on the indoor unit. The compressor and outdoor fan motor will operate at 100% capacity. To exit the charging mode, remove the Charge Mode Jumper and remove the Y1 Cooling demand and indoor blower demand. The Charge Mode has a maximum time of 60 minutes and will automatically exit the charge mode after 60 minutes is the charge mode jumper is left in place.
The Operation Mode Jumper is only used on applications installed with a conventional 24VAC Non-communicating thermostat. In applications with a conventional 24VAC non-communicating thermostat, the compressor capacity is controlled to maintain the target suction pressure setpoint. The Operation Mode Jumper has three selectable cooling modes. The three modes are Efficiency (Jumper installed on Pins 1 & 2), Normal Mode (Jumper installed on Pins 2 & 3) and Comfort Mode (Jumper Removed). The factory default position is the Efficiency Mode. The Efficiency mode has a variable suction pressure setpoint that will vary with the outdoor temperature; as the outdoor temperature increases the suction pressure setpoint will decrease. When the Operation Mode jumper is installed in the "Normal Mode" the suction pressure setpoint is 135 psig.
When the Operation Mode jumper is installed in the "Comfort Mode" the suction pressure setpoint is 125 psig.
EL18XPV Unit Operation with a S30 iComfort Communicating Thermostat
When the EL18XPV unit is installed with a S30 iComfort Communicating Thermostat and iComfort enabled indoor unit, the unit capacity will be controlled in the variable capacity mode throughout the range of capacity from minimum capacity to maximum capacity based upon thermostat demand. The indoor air volume will be controlled to match cooling capacity throughout the capacity range.
EL18XPV Unit Operation with a Conventional 24VAC Non-Communicating 2-Stage Thermostat
When the EL18XPV unit is installed with a conventional 24VAC non-communicating 2-stage thermostat, a Y1 first stage heating or cooling demand will initiate heating or cooling operation and first stage indoor blower operation. The compressor will be controlled in the variable capacity mode by varying the compressor capacity to obtain the target suction pressure set point. The Y2 second stage heating or cooling demand will initiate second stage blower operation. Increased air volume will increase the load on the indoor coil and increase the suction pressure. The EL18XPV compressor capacity will continue to be controlled based upon the suction pressure. The unit capacity will be controlled in the variable capacity mode throughout the range of capacity from minimum capacity to maximum capacity. If the Y2 demand remains after 20 minutes, the EL18XPV control will begin to ramp up the compressor capacity until maximum capacity is achieved. The EL18XPV unit will cycle off once the thermostat demand is satisfied.
EL18XPV Unit Operation with a Conventional 24VAC Non-Communicating Single-Stage Thermostat
When the EL18XPV unit is installed with a conventional 24VAC non-communicating single-stage thermostat, a Y1 first stage heating or cooling demand will initiate heating or cooling operation and heating or cooling indoor blower operation. In single stage thermostat applications, a jumper must be installed between Y1 and Y2 on the EL18XPV outdoor control. The compressor will be controlled in the variable capacity mode by varying the compressor capacity to obtain the target suction pressure set point. If the heating or cooling demand remains after 20 minutes, the EL18XPV control will begin to ramp up the compressor capacity until maximum capacity is achieved. The EL18XPV unit will cycle off once the thermostat demand is satisfied.
If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging.
HEAT PUMP CONTROL – DEFROST OPERATION
A full description of the heat pump control can be found in the detailed installation and service procedure manual available on LennoxPros.com.
The master control measures differential temperatures to detect when the system is performing poorly because of frost build-up on the outdoor coil. The heat pump control self-calibrates when the defrost system starts and after each system defrost cycle. The heat pump control monitors ambient temperature, outdoor coil temperature, and total run-time to determine when a defrost cycle is required. The coil temperature sensor is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation.
NOTE – The heat pump control accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the heat pump control initiates defrost cycles.
OPERATING MANIFOLD GAUGE SET AND SERVICE VALVES
The liquid and vapor line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging.
Each valve is equipped with a service port which has a factory-installed valve stem. Figures 14 and 15 provide information on how to access and operate both angle- and ball-type service valves.
Torque Requirements
When servicing or repairing heating, ventilating and air conditioning components, ensure the fasteners are appropriately tightened. Table 1 lists torque values for fasteners.
TABLE 1 – TORQUE REQUIREMENTS
Parts | 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 prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.
Using Manifold Gauge Set
When checking the system charge, only use a manifold gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant systems must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0 - 800 psig on the high side and a low side of 30" vacuum to 250 psig with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.
OPERATING BALL-TYPE SERVICE VALVE
FIGURE 15
OPERATING ANGLE-TYPE SERVICE VALVE
FIGURE 16
ACCESS SERVICE PORT
FIGURE 17
A service port cap protects the service port core from contamination and serves as the primary leak seal.
Reinstall Stem Cap
Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:
The EL18XPV unit is factory-charged with enough HFC410A refrigerant to accommodate a 15-foot length of refrigerant piping. For refrigerant piping greater than 15 feet, calculate the additional charge using the table below. Then add the additional charge specified for the specific indoor coil match-up listed on the unit charging sticker.
When charging the system with refrigerant or checking refrigerant, the "Charge Mode" (CHRG MODE) jumper provides the ability operate the unit at 100% capacity. See Charge Mode Jumper section for details.
Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access panel. Detailed information is given in the EL18XPV Installation and Service Procedures manual, which is available on LennoxPros.com.
Refrigerant Charge per Line Set Length
LIQUID LINE DIA. | OUNCES PER 5 FEET (G PER 1.5 M) ADJUST FROM 15 FEET (4.6 M) LINE SET* |
3/8" (9.5 MM) | 3 OUNCES PER 5' (85 G PER 1.5 M) |
*If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount.
NOTE – Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.
This unit is equipped with a high pressure switch which is located on the liquid line. The SPST, normally closed pressure switch opens when liquid line pressure rises above the factory setting of 590 + 15 psig and automatically resets at 418 + 15 psig.
Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.
In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. The system should be inspected and serviced before each cooling and heating season by a licensed professional HVAC service technician (or equivalent).
Homeowner Maintenance
The following maintenance may be performed by the homeowner.
NOTE - The filter and all access panels must be in place any time the unit is in operation. If you are unsure about the filter required for your system, call your Lennox dealer for assistance.
Heat Pump Operation
Your new Lennox heat pump has several characteristics that you should be aware of:
Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of the steel and aluminum parts, diminish performance and affect longevity of the unit.
Thermostat Operation
See the thermostat homeowner manual for instructions on how to operate your thermostat.
Pre-Service Check
If your system fails to operate, check the following before calling for service:
If service is needed, locate and write down the unit model number and have it handy before calling.
NOTICE!
Failure to follow instructions will cause damage to the unit. This unit is equipped with an aluminum coil. Aluminum coils may be damaged by exposure to solutions with a pH below 5 or above 9. The aluminum coil should be cleaned using potable water at a moderate pressure (less than 50psi). If the coil cannot be cleaned using water alone, Lennox recommends use of a coil cleaner with a pH in the range of 5 to 9. The coil must be rinsed thoroughly after cleaning. In coastal areas, the coil should be cleaned with potable water several times per year to avoid corrosive buildup (salt).
Your heating and air conditioning system should be inspected and maintained twice each year (before the start of the cooling and heating seasons) by a licensed professional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC technician.
Outdoor Unit
Indoor Unit (Air Handler or Furnace)
General System Test with System Operating
Customer:
Indoor Unit Model:
Outdoor Unit Model:
Address:
Serial:
Serial:
Notes:
START UP CHECKS
Refrigerant Type:
Rated Load Amps:
Condenser Fan Full Load Amps
Actual Amps
Rated Volts
Actual Volts
Actual Amps:
COOLING MODE
Suction Pressure:
Liquid Pressure:
Supply Air Temperature:
Ambient Temperature:
Return Air: Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach temperatures.)
Subcooling:
A — B = SUBCOOLING
Saturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Approach: A — B = APPROACH
Liquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Indoor Coil Temperature Drop (18 to 22°F)
A — B = COIL TEMP DROP
Return Air Temperature (A)
minus Supply Air Temperature (B)
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.
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.
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.
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Advertisement
Need help?
Do you have a question about the Elite Series and is the answer not in the manual?
Questions and answers