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Table of Contents
E2018 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This SL18XP1 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 SL18XP1 Product Specifications
bulletin (EHB) for matching indoor components.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
NOTICE !
For more in-depth information, consult the Installa
tion and Service Procedures manual, available as
Corp.1406-L10 on LennoxPROS.com or through the
Technical Support department at 800-453-6669.
STEP 1 -- SETTING THE UNIT -- Clearances
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See
NOTES
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See NOTES
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NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection SL18XP1 System
HEAT PUMPS
507468-01
7/2018
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal inju
ry or loss of life.
Installation and service must be performed by a licensed
professional installer (or equivalent) or service agency.
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
NOTES:
Service clearance of 30 in. 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.
Clearance to one of the remaining two sides may be 12 in. and the
See
final side may be 6 in.
NOTES
A clearance of 24 in. must be maintained between two units.
48 in. clearance required on top of unit.
Control
Box
FIGURE 1
Page 1
WARNING
CAUTION
®
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Related Manuals for Lennox SL18XP1
Summary of Contents for Lennox SL18XP1
- Page 1 General maintenance can cause property damage, personal inju ry or loss of life. This SL18XP1 outdoor heat pump with all-aluminum coil is designed for use with HFC-410A refrigerant only. This Installation and service must be performed by a licensed unit must be installed with an approved indoor air handler professional installer (or equivalent) or service agency.
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Page 2: Unit Dimensions - Inches (Mm)
STEP 1 -- SETTING THE UNIT (Continued) -- Unit Dimensions/Placement UNIT DIMENSIONS - INCHES (MM) DISCHARGE AIR 39-1/2 ELECTRICAL INLETS 35-1/2 (1003) (902) 37 (940) [-024 AND -030] 41 (1041) [-036 AND -042] 47 (1194) [-048 AND -060] 4-7/16 VAPOR LINE (113) INLET LIQUID LINE... - Page 3 An indoor expansion valve ap proved for use with HFC-410A refrigerant must be TWO 90_ ELBOWS INSTALLED IN LINE SET ordered separately and installed prior to operating WILL REDUCE LINE SET VIBRATION the system. FIGURE 2 Page 3 SL18XP1 SERIES...
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Page 4: Slab Mounting
STEP 1 -- SETTING THE UNIT (Continued) -- Unit Placement STABILIZING UNIT ON UNEVEN SURFACES SLAB MOUNTING IMPORTANT ! #10 X 1/2” LONG SELF-DRILLING SHEET METAL SCREWS Unit Stabilizer Bracket COIL (field-provided): STABILIZING BRACKET Always use stabilizers when unit is BASE PAN (18 GAUGE METAL —... - Page 5 If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to pre NOTE — 24VAC, Class II circuit connections are made in vent compressor damage as a result of slugging. the control box. Page 5 SL18XP1 SERIES...
- Page 6 A. ROUTE CONTROL WIRES — NON-COMMUNICATING Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. All low voltage wiring must enter unit through provided field-installed busing installed in electrical inlet. Run 24VAC control wires through hole with grommet. Make 24VAC control wire connections to heat pump control (A175).
- Page 7 When the ambient sensor temperature is higher than 40°F, and J1 is set to MAX, defrost termina tion will be 90°F. If J1 is to 50°F, 70°F, 90°F or 100°F , defrost termination will follow the J1 setting. FIGURE 7 Page 7 SL18XP1 SERIES...
- Page 8 STEP 2 -- ELECTRICAL (Continued) -- Field Control Wiring The following two illustrations provide examples of control wiring connections when using a non-communicating thermostat. For examples of control wiring in complete- or partial-communicating systems, see the iComfort ® -enabled thermostat Quick Start Guide which is provided with the thermostat.
- Page 9 (A175) and the W1 terminal on the furnace control. The temper kit cycles the furnace on and off during the defrost cycle. It also protects the heat pump compressor from high pressures during defrost. FIGURE 9 Page 9 SL18XP1 SERIES...
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Page 10: Step 3 -- Refrigerant Piping
Take care to empty all existing traps. Polyol es IMPORTANT ! ter (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act Some scroll compressors have an internal vacuum as an insulator, preventing proper heat transfer. - Page 11 *IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system has experienced burn out, it is recommended that the existing line set and indoor coil be replaced. FIGURE 10 Page 11 SL18XP1 SERIES...
- Page 12 STEP 5 -- REFRIGERANT PIPING -- Brazing Procedures CAP AND CORE REMOVAL PIPING PANEL REMOVAL / PREPARING LINE SET Remove service cap and core from both the vapor Remove piping panel to access service valves. Cut and liquid line service ports. ends of the refrigerant lines square (free from nicks or dents) and debur the ends.
- Page 13 PREPARATION FOR NEXT STEP After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both services valves to cool piping. Once piping is cool, remove all water-saturated cloths. FIGURE 12 Page 13 SL18XP1 SERIES...
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Page 14: Step 6 -- Installing Indoor Expansion Valve
STEP 6 -- INSTALLING INDOOR EXPANSION VALVE THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE THE LENNOX SL18XP1 PRODUCT SPECIFICATION BULLETIN (EHB) FOR APPROVED EXPANSION VALVE KITS AND APPLICATION INFORMATION. -
Page 15: Step 7 -- Leak Test
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. After leak testing, disconnect gauges from service ports. FIGURE 14 Page 15 SL18XP1 SERIES... - Page 16 STEP 8 -- EVACUATION Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non- condensables and water suction combine with refrigerant to produce substances that corrode copper piping and com...
- Page 17 Triple Evacuation Sequence Charging EVACUATE The SL18XP1 unit is factory-charged with enough HFC-410A refrigerant to accommodate a 15-foot length of BREAK VACUUM WITH DRY NITROGEN refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure stick...
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Page 18: Homeowner Information
If you are unsure about the In order to ensure peak performance, your system must be filter required for your system, call your Lennox dealer for properly maintained. Clogged filters and blocked airflow assistance. - Page 19 (less than 50psi). If the coil can General System Test with System Operating not be cleaned using water alone, Lennox recom 1. Your technician should perform a general system test. mends use of a coil cleaner with a pH in the range of He will turn on the air conditioner to check operating 5 to 9.
- Page 20 All components in the system must be functioning properly to correctly perform compressor operational check. (Accurate measurements are critical to this test as indoor system loading and outdoor ambient can affect variations between low and high capacity readings). SL18XP1 Start-Up and Performance Checklist Customer Address...