Lennox SL18XC1, XP21-036, XP21-060, XP21-024, XP21-048 Installation Instructions Manual
...
INSTALLATION
E2016 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This SL18XC1 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 han
dler or coil. See the Lennox SL18XC1 Product Specifica
tions 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 !
For more in-depth information, consult the Installa
tion and Service Procedures manual, available as
Corp. 1405-L10 on DaveNet or through the Technical
Support department at 800-453-6669.
INSTRUCTIONS
Dave Lennox Signature
Collection SL18XC1 System
AIR CONDITIONERS
507353-01
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
CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)
6 (152)
CONTROL
PANEL ACCESS
LOCATION
24
(610)
30 (762)
12 (305)
36 (914)
MINIMUM CLEARANCE BETWEEN TWO UNITS
NOTES:
S Clearance to access panel must be 30
inches (762mm).
S Clearance to one of the other three
sides must be 36 inches (914mm).
S Clearance to one of the remaining two
sides may be 12 inches (305mm) and
the final side may be 6 inches
(152mm).
ACCESS PANEL
LINE SET
CONNECTIONS
MINIMUM CLEARANCE
ABOVE UNIT
48 (1219)
REAR VIEW OF UNIT
FIGURE 1
Page 1
STEP 1 -- SETTING THE UNIT (Continued) -- Dimensions / Placement
UNIT DIMENSIONS - INCHES (MM)
39.40”
(1003)
DISCHARGE AIR
ELECTRICAL INLETS
[-030 THROUGH -042]
SUCTION LINE
INLET
LIQUID
LINE
INLET
41 (1040)
[-024, -048, -060]
47 (1194)
18.60”
(470)
8.00” (203)
35.50”
(902)
SIDE VIEW
UNIT SUPPORT
FEET
3-1/8
16-7/8
(429)
8-3/4
(222)
(79)
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.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and use protective
clothing.
30-3/4
(781)
1 (25)
26-7/8
(683)
3-3/4 (95)
4-5/8
(117)
ACCESS VIEW
BASE WITH
ELONGATED LEGS
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.
Page 2
PLACEMENT
INSTALL UNIT AWAY
FROM WINDOWS
TWO 90_ ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
FIGURE 2
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
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)
#10 X 1-1/4” LONG
HEX HD SCREW AND
FLAT WASHER
Concrete slab — use two
plastic anchors (hole drill 1/4”)
CORNER POST
Deck Top Mounting
Stabilizing bracket - 18 gauge metal.
2” (50.8mm) width; height as required.
Bent to form right angle as shown.
SAME FASTENERS AS
SLAB SIDE MOUNTING.
COIL
BASE PAN
MOUNTING
SLAB
GROUND LEVEL
FIGURE 3
ELEVATED SLAB MOUNTING USING FEET
EXTENDERS
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
2” (50.8MM)
SCH 40 MALE
THREADED
ADAPTER
LEG DETAIL
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.
BASE
FIGURE 4
MINIMUM ONE
PER SIDE
FOR EXTRA
STABILITY
Install one bracket per side (minimum). For extra stability, install
two brackets per side, two inches (51mm) from each corner.
IMPORTANT !
Unit Stabilizer Bracket (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.
FIGURE 5
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.
Page 3
SL18XC1 SERIES
24VAC TRANSFORMER
Use the transformer provided with the furnace or air han
dler for low‐voltage control power (24VAC - 40 VA mini
mum).
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 unit
nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker size (HACR per NEC). Install pow
er wiring and properly sized disconnect switch.
NOTE — Units are approved for use only with cop
per 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.
CAUTION
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit's electronic controls.
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
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.
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
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
A
HOLE
CONTROL
(A175)
B. ROUTE CONTROL WIRES — COMMUNICATING
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 busing installed
in electrical inlet.
Communicating systems using the iComfortt-enabled thermostat require four thermostat wires between the thermostat and the furnace/air handler
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 figure 7.
iComfortt-enabled
Outdoor Unit
Single Wire To
C Terminal
iComfortt-enabled
Indoor Unit
Single Wire To
C Terminal
iComfortt-enabled
thermostat
Unused Wires
Unused Wires
FIGURE 6
Page 4
B. 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
GROUND LUG*
CONTROL BOX
ACCESS VIEW
* Attach field-provided
WATERTIGHT
FLEXIBLE CONDUIT
CONTACTOR
ELECTRICAL
INLET (HIGH
VOLTAGE)
WIRING ENTRY
POINTS
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
TO SERVICE
DISCONNECT BOX
ELECTRICAL INLET (CONTROL WIRING —
LOW VOLTAGE). USE BUSHING
PROVIDED IN BAG ASSEMBLY HERE.
wire.
FIGURE 7
STEP 2 -- ELECTRICAL (Continued) -- Outdoor Control (A175) Jumpers and Terminals
J4 - COMPRESSOR
SHIFT DELAY
30
SECOND DELAY
(DEFAULT)
0
SECOND DELAY
30
J2 - SECOND-STAGE
LOCK-IN
TEMPERATURE
(TWO-STAGE HEAT PUMP ONLY)
55
DEGREE
TARGET
50
DEGREE
TARGET
45
DEGREE
TARGET
40
DEGREE
TARGET (DEFAULT)
55
50
45
55
50
45
55
50
45
55
50
45
40
7-SEGMENT DISPLAY
PUSH BUTTON
J3 - DEFROST AUTO
(HEAT PUMP ONLY)
JUMPER ON PINS 1 AND 2
DEFROST AUTO ENABLED
JUMPER ON PINS 2 AND 3
DEFROST AUTO DISABLED (DEFAULT)
ON
OFF
J1 - DEFROST TERMINATION
0
SECOND-STAGE LOCK-IN
40
40
TEMPERATURE
TEMPERATURE
MAX
TARGET
90
MAX
90
DEGREE
TARGET
90
70
DEGREE
TARGET
MAX
MAX
DS TO R LINK - EDA
(HEAT PUMP ONLY)
70
50
(DEFAULT WHEN JUMPER IS
REMOVED OR MISSING)
70
50
70
DEGREE
TARGET
(DEFAULT)
90
70
50
MAX
90
90
70
50
MAX
90
70
50
APPLICATION
(TWO-STAGE UNIT ONLY)
40
NOTE - LINK NOT APPLICABLE TO SINGLE-STAGE
UNIT. CUTTING LINK WILL HAVE NO AFFECT ON
OPERATION OF SINGLE-STAGE UNITS
.
CUT FOR HUMIDITROL® - ENHANCED
DEHUMIFICATION ACCESSORY (EDA)
APPLICATIONS.
FIGURE 8
Page 5
SL18XC1 SERIES
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