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©2021 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.
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.
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 EL18XPV Units
®
HEAT PUMP
508059-01
1/2021
PACKING LIST
WARRANTY
CERTIFICATE
OUTDOOR UNIT
General
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 EL18X-
PV 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 intend-
ed 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 on LennoxPros.com or through the
Technical Support department at 800-453-6669.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 21 in this
instruction for information.
RAST 6-PIN
CONNECTORS (2)
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Related Manuals for Lennox Elite EL18XPV Series
Summary of Contents for Lennox Elite EL18XPV Series
- Page 1 INSTALLATION INSTRUCTIONS ©2021 Lennox Industries Inc. Elite Series EL18XPV Units Dallas, Texas, USA ® HEAT PUMP 508059-01 1/2021 PACKING LIST WARRANTY CERTIFICATE RAST 6-PIN OUTDOOR UNIT CONNECTORS (2) THIS MANUAL MUST BE LEFT WITH THE General HOMEOWNER FOR FUTURE REFERENCE...
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Page 2: Unit Dimensions - Inches (Mm)
UNIT DIMENSIONS – INCHES (MM) TOP VIEW C (depth) B (width) DISCHARGE AIR LIQUID LINE CONNECTION (height) ELECTRICAL INLETS SUCTION LINE CONNECTION 2 (51) 4−3/4 4−1/4(108) (121) 1 (25) SIDE VIEW END VIEW UNIT SUPPORT UNIT SUPPORT FEET FEET 8−1/2 9−1/2 (216) (241) -
Page 3: Slab Mounting
WARNING ELEVATED SLAB MOUNTING USING FEET EXTENDERS To prevent personal injury, as well as damage to panels, Use additional 2" SCH 40 male unit or structure, observe the following: 2" (50.8MM) SCH 40 threaded adapters which can FEMALE THREADED be threaded into the female While installing or servicing this unit, carefully stow all ADAPTER threaded adapters to make... -
Page 4: Refrigerant Piping
Take care to empty all existing traps. Polyvinyl ether (PVE) and polyol When using a high pressure gas such as ester (POE) oils are used in Lennox variable-capacity nitrogen to pressurize a refrigeration or air units charged with HFC-410A refrigerant. Residual... - Page 5 NOTE – Maximum lifts are dependent on total length, line sets longer than 51 feet. Use tables 2 and 3 to de- termine the correct liquid and vapor line sizes. number of elbows, etc. that contribute to total pressure drop. •...
- Page 6 REFRIGERANT PIPING – Removing Existing Indoor Metering Device 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...
- Page 7 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 8 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 9 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 EL18XPV Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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Page 10: Leak Test And Evacuation
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 11 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...
- Page 12 The protect the unit’s electronic controls. Lennox M30, ComfortSense 7500, ComfortSense 3000 ELECTROSTATIC Precautions will help to avoid control and many other commercially available electronic thermo-...
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Page 13: Disconnect Switch
EL18XPV Thermostat Control Options Qty. of EL18XPV Field Wiring Thermostat Type Indoor Unit Type Wires to Terminal Strip Unit Operation Diagram EL18XPV Connections iComfort S30 iComfort Fully Communicating Variable Capacity Communicating Comunicating Gas R, I+, I-, C Figure 13 Operation Based Upon Thermostat Demand Thermostat Furnace or Air Handler Conventional 24VAC... - Page 14 ROUTE CONTROL WIRES iComfort Communicating Thermostat Wiring Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with º º a temperature rating of 95 F (35 C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through field-provided field-installed grommet installed in electrical inlet.
- Page 15 EL18XPV DATS (Optional) RAST 6-Pin Connectors OATS (Optional) Communicating Indoor Unit EL18XPV Outdoor Unit HD Display S30 Smart Hub Subbase or Mag-Mount PROVIDED RAST 6-PIN CONNECTOR INDOOR CONTROL Indoor Control Single Wire To C Terminal Single Wire To C Terminal Unused Wires Unused Wires FIGURE 13.
- Page 16 FIGURE 14. Conventional 24VAC Cooling Non-Communicating Thermostat Wiring Page 16...
- Page 17 5 – Outdoor Unitary Control - Jumpers and Terminals 7 SEGMENT DISPLAY CHARGE MODE JUMPER (CHRG MODE) CHARGE MODE AND OPERATION MODE JUMPER DETAIL OPERATION MODE JUMPER PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION nicating thermostat, the charge mode jumper must be in- Outdoor Control 7 Segment Display and stalled on the Charge Mode Pins after providing a Y1 cool- Push Button...
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Page 18: Unit Operation
When the Operation Mode jumper is installed in the “Com- 3 - After evacuation is complete, open the liquid line and fort Mode” the suction pressure setpoint is 125 psig. vapor line service valve stems to release the refrigerant charge (contained in outdoor unit) into the system. Unit Operation 4 - Replace the stem caps and tighten to the value EL18XPV Unit Operation with a S30 iComfort Commu-... - Page 19 TABLE 1 – TORQUE REQUIREMENTS OPERATING ANGLE-TYPE SERVICE VALVE Parts Recommended Torque 1 - Remove stem cap with an appropriately sized wrench. Service valve cap 8 ft.-lb. 11 NM 2 - Use a service wrench with a hex-head extension (3/16" for liquid line valve sizes and 5/16"...
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Page 20: Checking Refrigerant Charge
If you are unsure about length is less than 15 ft. (4.6 m), subtract this amount. the filter required for your system, call your Lennox dealer NOTE – Insulate liquid line when it is routed through areas where for assistance. -
Page 21: Professional Maintenance
(less than 50psi). If the being affected by indoor air contamination. Check coil cannot be cleaned using water alone, Lennox condition of insulation on the refrigerant lines. recommends use of a coil cleaner with a pH in the Repair, correct, or replace as necessary. -
Page 22: Start Up Checks
EL18XPV Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature:...
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