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©2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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.
STEP 1 – SETTING THE UNIT – Clearances
See NOTES
See
NOTES
See NOTES
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).
See
Clearance to one of the remaining two sides may be 12 in. (305mm)
NOTES
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.
Control
Box
Page 1
INSTALLATION
INSTRUCTIONS
Elite
Series EL15XP1 Units
®
HEAT PUMP
507750-01
10/2017
General
This EL15XP1 outdoor heat pump 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. See the Lennox EL15XP1 Product Specifications
bulletin (EHB) for approved indoor component match ups.
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 in-depth information, consult the Installation
and Service Procedures manual, available as
Corp1704-L7 on LennoxPros.com or through the
Technical Support department at 800-453-6669.
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.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 18 in this
instruction for information.
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Summary of Contents for Lennox Elite EL15XP1
- Page 1 HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. See the Lennox EL15XP1 Product Specifications bulletin (EHB) for approved indoor component match ups. These instructions are intended as a general guide and do THIS MANUAL MUST BE LEFT WITH THE not supersede local codes in any way.
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Page 2: Side View
IMPORTANT STEP 1 – SETTING THE UNIT (Continued) – Unit Placement This unit must be matched with an indoor coil as specified in the Lennox Engineering Handbook. Coils previously NOTICE! charged with HCFC-22 must be flushed. Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. - Page 3 WARNING IMPORTANT To prevent personal injury, as well as damage to panels, This model is designed for use in check / expansion unit or structure, observe the following: valve systems only. An indoor expansion valve approved for use with HFC-410A refrigerant must be ordered While installing or servicing this unit, carefully stow all separately and installed prior to operating the system.
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Page 4: Step 2 - Refrigerant Piping
Polyol ester (POE) oils are used Refrigerant can be harmful if it is inhaled. Refrigerant in Lennox units charged with HFC-410A refrigerant. must be used and recovered responsibly. Residual mineral oil can act as an insulator, preventing Failure to follow this warning may result in personal proper heat transfer. - Page 5 STEP 2 – REFRIGERANT PIPING – (Continued) TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...
- Page 6 STEP 2 – REFRIGERANT PIPING – Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
- Page 7 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port.
- Page 8 STEP 2 – REFRIGERANT PIPING – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the EL15XP1 Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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Page 9: Step 3 - Leak Test And Evacuation
STEP 3 – LEAK TEST AND EVACUATION LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. - Page 10 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
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Page 11: Electrostatic Discharge
WARNING STEP 4 – ELECTRICAL – Circuit Sizing and Wire Routing Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). -
Page 12: Low Voltage Connections
LOW VOLTAGE CONNECTIONS HIGH VOLTAGE FIELD WIRING LOW VOLTAGE (24V) FIELD WIRING WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) TEMPERATURE RATING 24VAC MORE THAN 100' (30 METERS) 35ºC MINIMUM. CONNECTIONS NOTE - For proper voltages, select thermostat wire (control wires) gauge per table above. - Page 13 Typical 24VAC Control Wiring Diagrams (Field Installed) THERMOSTAT INDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT THERMOSTAT INDOOR UNIT 24V POWER 24V POWER COMMON COMMON EMERGENCY COMMON COMMON HEAT RELAY OUTDOOR EMERGENCY 1ST STAGE 1ST STAGE HEAT THERMOSTAT AUXILIARY AUXILIARY HEAT HEAT 1ST STAGE 1ST STAGE AUXILIARY...
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Page 14: Step 5 - Unit Start-Up
STEP 5 – UNIT START-UP TABLE 2 TORQUE REQUIREMENTS IMPORTANT Parts Recommended Torque Service valve cap 8 ft.-lb. 11 NM If unit is equipped with a crankcase heater, it should Sheet-metal screws 16 in.-lb. 2 NM be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. - Page 15 Checking Refrigerant Charge OPERATING ANGLE-TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. The EL15XP1 unit is factory-charged with enough HFC- 2 - Use a service wrench with a hex-head extension (3/16" for liquid 410A refrigerant to accommodate a 15-foot length of line valve sizes and 5/16"...
- Page 16 When the selected compressor run time interval is IMPORTANT reached, the defrost relay is energized and defrost begins. The TEST pins are ignored and the TEST function is • An on-board outdoor ambient temperature sensor on the defrost control bypasses the low pressure switch locked out: during low ambient temperature below 15ºF in heating •...
- Page 17 25 PSIG +/- 5 PSIG and auto- • Have your Lennox dealer show you where your indoor matically resets at 40 PSIG +/- 5 PSIG. If the low pressure unit filter is located. It will be either at the indoor unit...
- Page 18 NOTICE ! any time the unit is in operation. If you are unsure about Failure to follow instructions will cause damage to the filter required for your system, call your Lennox dealer the unit. for assistance. This unit is equipped with an aluminum coil.
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Page 19: Start Up Checks
4 - Inspect the indoor coil drain pans and condensate 9 - If your heat pump is matched with a gas- or oil-fired drains for rust, debris, obstructions, leaks or cracks. furnace for auxiliary heating, indoor unit service Pour water in pans to confirm proper drainage from will also include inspection and cleaning of the the pan through to the outlet of the pipe.
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