Lennox SL18XP1, XC17 Installation Instruction
INSTALLATION
2018 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.
INSTRUCTIONS
Dave Lennox Signature
Collection SL18XP1 System
HEAT PUMPS
507468-01
7/2018
WARNING
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.
CAUTION
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
®
STEP 1 -- SETTING THE UNIT -- Clearances
NOTES:
See NOTES
See
NOTES
See NOTES
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.)
See
NOTES
Control
Box
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
final side may be 6 in.
A clearance of 24 in. must be maintained between two units.
48 in. clearance required on top of unit.
FIGURE 1
Page 1
STEP 1 -- SETTING THE UNIT (Continued) -- Unit Dimensions/Placement
UNIT DIMENSIONS - INCHES (MM)
39-1/2
(1003)
DISCHARGE AIR
ELECTRICAL INLETS
37 (940) [-024 AND -030]
41 (1041) [-036 AND -042]
47 (1194) [-048 AND -060]
VAPOR LINE
INLET
LIQUID LINE
INLET
4-7/16
18-1/2
(470)
(113)
8 (203)
1 (25)
SIDE VIEW ACCESS VIEW
UNIT SUPPORT
FEET
35-1/2
(902)
16-7/8
(429)
8-3/4
(222)
3-1/8
(79)
30-3/4
(781)
BASE WITH ELONGATED LEGS
26-7/8
(683)
3-3/4 (95)
4-5/8
(117)
Page 2
STEP 1 -- SETTING THE UNIT (Continued)
-- Unit Placement
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 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.
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.
IMPORTANT !
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.
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.
BUILDING
STRUCTURE
DISCHARGE AIR
MOUNTING
SLAB
GROUND LEVEL
FIGURE 3
ELEVATED SLAB MOUNTING USING FEET
EXTENDERS
Use additional 2” SCH 40 male threaded adapters which can be
threaded into the female threaded adapters to make additional
adjustments to the level of the unit.
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
2” (50.8MM) SCH 40
MALE THREADED
ADAPTER
PLACEMENT
INSTALL UNIT AWAY
FROM WINDOWS
TWO 90 ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
FIGURE 2
BASE
LEG DETAIL
FIGURE 4
IMPORTANT !
This model is designed for use in check / expansion
valve systems only. An indoor expansion valve ap
proved for use with HFC-410A refrigerant must be
ordered separately and installed prior to operating
the system.
Page 3
SL18XP1 SERIES
STEP 1 -- SETTING THE UNIT (Continued) -- Unit Placement
STABILIZING UNIT ON UNEVEN SURFACES
SLAB MOUNTING
#10 X 1/2” LONG SELF-DRILLING
SHEET METAL SCREWS
STABILIZING BRACKET
(18 GAUGE METAL — 2” WIDTH;
HEIGHT AS REQUIRED)
COIL
BASE PAN
Always use stabilizers when unit is
raised above the factory height.
(Elevated units could become unsta
#10 X 1-1/4” LONG HEX HD SCREW
Concrete slab — use two plastic anchors
(hole drill 1/4”)
AND FLAT WASHER
CORNER POST
ble in gusty wind conditions.)
Stabilizers may be used on any unit
installed on unstable and uneven
surfaces.
DECK TOP MOUNTING
Stabilizing bracket (18 gauge metal — 2” [50.8mm] width; height as required); bend to form
right angle as shown below.
MINIMUM ONE
PER SIDE
!
IMPORTANT !
Unit Stabilizer Bracket
(field-provided):
SAME FASTENERS AS
SLAB SIDE MOUNTING.
Install one bracket per side (minimum). For extra stability, install
two brackets per side, two inches (51mm) from each corner.
WIND BARRIER
Install the unit a minimum of six inches (152 mm)
above the roof surface to avoid ice build-up around
the unit. Locate the unit above a load-bearing wall
or area of the roof that can adequately support the
unit. Consult local codes for rooftop applications.
If coil must be installed facing prevailing winter
winds, a wind barrier should be constructed. Size
barrier at least the same height and width as out
door unit. Install barrier 24 inches (610 mm) from
the sides of the unit in the direction of prevailing
winds.
FOR EXTRA
STABILITY
INLET AIR
PREVAILING WINTER
WINDS
WIND BARRIER
INLET AIR
24”
(610)
INLET AIR
FIGURE 5
Page 4
STEP 2 -- ELECTRICAL -- Circuit Sizing
and Wire Routing
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 han
dler for low‐voltage control power (24VAC - 40 VA mini
mum).
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
CAUTION
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.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be 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.
IMPORTANT !
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to pre
vent compressor damage as a result of slugging.
1. Size Circuit and Install Disconnect: Refer to the unit
nameplate for minimum circuit ampacity, and maxi
mum fuse or circuit breaker size (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 connect
to an earth ground.
2. Install Thermostat: Install room thermostat (ordered
separately) on an inside wall in the center of the condi
tioned area and 5 feet (1.5m) from the floor. The ther
mostat 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 box.
Page 5
SL18XP1 SERIES
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).
NOTE — Do not bundle any excess 24VAC control wires inside control box.
NOTE — Wire tie provides low voltage wire strain relief and maintains
B
separation of field-installed low and high voltage circuits.
NOTE — For proper voltages, select control wires gauge per table below.
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
B. ROUTE CONTROL WIRES — COMMUNICATING
A
Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with a temperature
rating of 95ºF (35ºC) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through provided field-installed bushing
installed in electrical inlet.
Communicating systems using the iComfort®-enabled thermostat require four thermostat wires between the thermostat and the furnace/air han
dler control and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used,
the extra wires must be properly connected to avoid electrical noise (see illustration below).
Use a wire nut to bundle the four unused wires at each end of the cable. Each bundle should also include an additional wire that should be connected
on each end to the C terminal as shown in the figure below.
iComfort®-enabled
iComfort®-enabled
Indoor Unit
Outdoor Unit
HOLE
CONTROL
(A175)
Single Wire To C
iComfort®-enabled
Terminal
Single Wire To C
Terminal
Unused Wires
Unused Wires
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 in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.
WATERTIGHT
CONDUIT FITTING
WATERTIGHT
FLEXIBLE CONDUIT
TO SERVICE
DISCONNECT BOX
GROUND LUG*
CONTACTOR
ELECTRICAL INLET (CONTROL WIRING —
LOW VOLTAGE). USE BUSHING
PROVIDED IN BAG ASSEMBLY HERE.
CONTROL BOX
ELECTRICAL
INLET (HIGH
VOLTAGE)
WIRING ENTRY
POINTS
* Attach field-provided
green ground wire to
provided ground lug.
NOTE - Grounding wire
must be a single, contin
uous wire run from unit
ground lug to earth
ground. DO NOT splice
wire.
ACCESS VIEW
thermostat
FIGURE 6
Page 6
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