Lennox SL18XP1 User manual

Page 1

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.

INSTALLATION

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

ÍÍÍÍÍÍÍÍÍÍÍÍÍ

See

NOTES

See NOTES

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

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.

See

NOTES

See NOTES Control

Box

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.)

FIGURE 1

Page 2

STEP 1 -- SETTING THE UNIT (Continued) -- Unit Dimensions/Placement

UNIT DIMENSIONS - INCHES (MM)

4-5/8

(117)

39-1/2

(1003) 35-1/2

(902)

18-1/2

(470)

8 (203)

1 (25)

4-7/16

(113)

LIQUID LINE

INLET

VAPOR LINE

INLET

ELECTRICAL INLETS

BASE WITH ELONGATED LEGS

SIDE VIEW ACCESS VIEW

DISCHARGE AIR

37 (940) [-024 AND -030]

41 (1041) [-036 AND -042]

47 (1194) [-048 AND -060]

16-7/8

(429)

8-3/4

(222)

26-7/8

(683)

3-3/4 (95)

30-3/4

(781)

3-1/8

(79)

UNIT SUPPORT

FEET

Page 3

SL18XP1 SERIES

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.

INSTALL UNIT AWAY

FROM WINDOWS

TWO 90ELBOWS INSTALLED IN LINE SET

WILL REDUCE LINE SET VIBRATION

PLACEMENT

FIGURE 2

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.

GROUND LEVEL

MOUNTING

SLAB

BUILDING

STRUCTURE DISCHARGE AIR

SLAB MOUNTING

FIGURE 3

LEG DETAIL

BASE

2” (50.8MM) SCH 40

FEMALE THREADED

ADAPTER

ELEVATED SLAB MOUNTING USING FEET

EXTENDERS

2” (50.8MM) SCH 40

MALE THREADED

ADAPTER

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.

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 4

STEP 1 -- SETTING THE UNIT (Continued) -- Unit Placement

Unit Stabilizer Bracket

(field-provided):

Always use stabilizers when unit is

raised above the factory height.

(Elevated units could become unsta

ble in gusty wind conditions.)

Stabilizers may be used on any unit

installed on unstable and uneven

surfaces.

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.

24”

(610)

WIND BARRIER

PREVAILING WINTER

WINDS

INLET AIR

Concrete slab — use two plastic anchors

(hole drill 1/4”)

COIL

BASE PAN

CORNER POST

STABILIZING BRACKET

(18 GAUGE METAL — 2” WIDTH;

HEIGHT AS REQUIRED)

SLAB MOUNTING

#10 X 1/2” LONG SELF-DRILLING

SHEET METAL SCREWS

#10 X 1-1/4” LONG HEX HD SCREW

AND FLAT WASHER

STABILIZING UNIT ON UNEVEN SURFACES

!IMPORTANT !

MINIMUM ONE

PER SIDE

Stabilizing bracket (18 gauge metal — 2” [50.8mm] width; height as required); bend to form

right angle as shown below.

FOR EXTRA

STABILITY

DECK TOP MOUNTING

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.

FIGURE 5

Page 5

SL18XP1 SERIES

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).

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.

CAUTION

ELECTROSTATIC

DISCHARGE

(ESD)

Precautions and

Procedures

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.

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. Groundunit atdisconnectswitchorconnect

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 6

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.

NOTE — Wire tie provides low voltage wire strain relief and maintains

separation of field-installed low and high voltage circuits.

NOTE — Do not bundle any excess 24VAC control wires inside control box.

A. ROUTE CONTROL WIRES — NON-COMMUNICATING

CONTROL

(A175)

HOLE

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).

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 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.

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.

ROUTE HIGH VOLTAGE AND GROUND WIRES

CONTROL BOX

GROUND LUG*

CONTACTOR

WATERTIGHT

CONDUIT FITTING

WATERTIGHT

FLEXIBLE CONDUIT

TO SERVICE

DISCONNECT BOX

ACCESS VIEW

ELECTRICAL

INLET (HIGH

VOLTAGE)

WIRING ENTRY

POINTS

ELECTRICAL INLET (CONTROL WIRING —

LOW VOLTAGE). USE BUSHING

PROVIDED IN BAG ASSEMBLY HERE.

iComfort®-enabled

thermostat

iComfort®-enabled

Outdoor Unit

Single Wire To C

Terminal

Unused Wires

* 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.

Single Wire To C

Terminal

iComfort®-enabled

Indoor Unit

FIGURE 6

Page 7

SL18XP1 SERIES

STEP 2 -- ELECTRICAL (Continued) -- Outdoor Control (A175) Jumpers and Terminals

DEGREE

TARGET

DEGREE

TARGET

DEGREE

TARGET (DEFAULT)

40 55

DEGREE

TARGET

SECOND DELAY

CUT FOR HUMIDITROL®- ENHANCED

DEHUMIFICATION ACCESSORY (EDA)

APPLICATIONS.

SECOND-STAGE LOCK-IN

TEMPERATURE

J4 - COMPRESSOR

SHIFT DELAY

DS TO R LINK - EDA

APPLICATION

J2 - SECOND-STAGE

LOCK-IN

TEMPERATURE

(DEFAULT)

7-SEGMENT DISPLAY PUSH BUTTON

NOTE - LINK NOT APPLICABLE TO SINGLE-STAGE

UNIT. CUTTING LINK WILL HAVE NO AFFECT ON

OPERATION OF SINGLE-STAGE UNITS.

MAX

DEGREE

TARGET

DEGREE

TARGET

DEGREE

TARGET

MAX

J1 - DEFROST TERMINATION

TEMPERATURE

J3 - DEFROST AUTO

OFF

JUMPER ON PINS 1 AND 2

DEFROST AUTO ENABLED

DEFROST AUTO DISABLED (DEFAULT)

(DEFAULT)

(DEFAULT WHEN JUMPER IS

REMOVED OR MISSING)

MAX

JUMPER ON PINS 2 AND 3

J1 - DEFROST TERMINATION TEMPERATURE

1. The J1 jumper is factory set to 50°F (10°C). This jumper can also be set to 70°F, 90°F, 100°For MAX

(21°C, 32°C, 38°C and MAX). If a jumper is not present on J1, the default termination temperature is MAX.

NOTE  Colder climates could require a higher defrost termination temperature setting to maintain a clear coil.

2. If the J1 jumper is set to MAX, defrost will run maximum defrost sequence.

J3 - DEFROST AUTO

1. Defrost Auto can be set to either ON or OFF.Factory default setting is OFF. Note: If the jumper is miss

ing the default is OFF.

2. Defrost Auto is set to OFF - Defrost will run and terminate based on J1 setting.

3. Defrost Auto is set to ON - Defrost termination setting may differ from the actual J1 jumper setting. The

actual defrost termination will be determined based on the following rules:

A..The first defrost after the unit is powered up, or the first defrost after cooling call will terminate based

on the J1 setting.

B..The control accumulates heating runtime between defrost cycles:

Heating time between defrost is less than 50 minutes - The defrost termination temperature

will be increased for the next defrost cycle based on current termination setting. If current ter

mination setting is <70°F then the next defrost termination will be 90°F. If J1 is set at >70°F or

MAX the next defrost termination will be MAX.

Heating time between defrosts is longer than 1 hour for 2 consecutive heating cycles

- The defrost termination will be decreased for the next defrost cycle. If the termination is set

at 50°F, 70°F, or 90°F, then defrost termination will follow the J1 jumper setting. If the J1 is set

to MAX, then the next defrost termination will be 90°F.

C..If J1 is set to MAX, the system will always run at MAX when accumulated compressor OFF time

is longer than 30 minutes and ambient temperature is less than 35°F.

D..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.

(HEAT PUMP ONLY)

(TWO-STAGE HEAT PUMP ONLY)

(TWO-STAGE UNIT ONLY)

(HEAT PUMP ONLY)

FIGURE 7

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.

i−

Air Hander Control ComfortSense[7000 Thermostats

Catalog # Y0349 or Y2081

Single−Stage

Heat Pump Control

On−board link

Low voltage thermostat

wiring

Flat metal jumper

1. Thermostat Tterminals are used for outdoor sensor input. Sensor provides input for thermostat's outdoor

temperature display (optional).

2. Rto L connection is required for this model only when used with the ComfortSense®7000 thermostat - (catalog

number Y0349). Resistor Kit (catalog number 47W97) is required and must be ordered separately.

3. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For single-stage electric

heat, do not remove factory-installed metal jumper.

4. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For two-stage electric

heat, remove factory-installed metal jumper between W1 and W2. Then, connect thermostat wire between the air

handler control's W2 and the thermostat's W2 terminal.

5. Cut on-board link (clippable wire) from R-O HEAT PUMP for heat pump applications.

6. Cut on-board link (clippable wire) DS-R for Humiditrol®or Harmony IIIapplications. This will slow the indoor blower

motor to the lowest speed setting. See air handler installation instruction or product specification bulletin for lowest

fan speed information.

FIGURE 8

Page 9

SL18XP1 SERIES

i−

Furnace Control ComfortSense[7000 Thermostats

Catalog # Y0349 or Y2081

Single−Stage

Heat Pump Control

On−board link

Low voltage thermostat

wiring

1. Thermostat Tterminals are used for outdoor sensor input. Sensor provides input for thermostat's outdoor tempera

ture display (optional).

2. Rto L connection is required for this model only when used with the ComfortSense®7000 thermostat - (catalog

number Y0349). Resistor Kit (catalog number 47W97) is required and must be ordered separately.

3. Cut on-board link W951 (clippable wire) from R-O HEAT PUMP for heat pump applications.

4. Cut on−board link (clippable wire) DS−R for Humiditrol®or Harmony IIIapplications. This will slow the indoor

blower motor to the lowest speed setting. See furnace installation instruction or product specification bulletin for

lowest fan speed information.

NOTE - To use furnace to temper air during defrost, wire optional temper kit (67M41) between the W terminal of the heat

pump control (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 10

STEP 3 -- REFRIGERANT PIPING —

Flushing Existing Line Set & Indoor Coil

Flush the existing line set per the following instruc

tions. For more information, refer to the Installation

and Service Procedures manual available on

LennoxPROS.com. CAUTION - DO NOT attempt to

flush and re-use existing line sets or indoor coil

when the system contains contaminants (i.e., com

pressor burn out).

NOTE - When installing refrigerant lines longer than 50

feet, refer to the Refrigerant Piping Design and Fabrication

Guidelines manual available on LennoxPROS.com (Corp.

9351-L9), or contact the Technical Support Department

Product Application group for assistance.

NOTE - For new or replacement line set installation refer to

Service and Application Note - Corp 9112-L4 (C-91-4).

TABLE 1

REFRIGERANT LINE SET — INCHES (MM)

Model Liquid

Line

Vapor

Line

L15

Line Sets

Feet (Meters)

-024 and

-030 3/8” (10) 3/4” (19) L15 line set sizes are depen

dent on matching system com

ponents. See SL18XP1 Engi

neering Handbook to determine

correct line set sizes.

-036, -042

and -048 3/8” (10) 7/8” (22)

-060 3/8” (10) 1-1/8”

(29) Field-Fabricated

NOTE — Some applications may require a field-provided 7/8” to

1-1/8” adapter.

IMPORTANT !

If this unit is being matched with an approved line

set or indoor unit coil that was previously charged

with mineral oil, or if it is being matched with a coil

which was manufactured before January of 1999,

the coil and line set must be flushed prior to installa

tion. Take care to empty all existing traps. Polyol es

ter (POE) oils are used in Lennox units charged with

HFC-410A refrigerant. Residual mineral oil can act

as an insulator, preventing proper heat transfer. It

can also clog the expansion device and reduce sys

tem performance and capacity.

Failure to properly flush the system per this instruc

tion and the detailed Installation and Service Proce

dures manual will void the warranty.

WARNING

When using a high pressure gas such as

nitrogen to pressurize a refrigeration or air

conditioning system, use a regulator that

can control the pressure down to 1 or 2

psig (6.9 to 13.8 kPa).

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant

must be used and recovered responsibly.

Failure to follow this warning may result in personal injury

or death.

WARNING

Fire, Explosion and Personal Safety Haz

ard. Failure to follow this warning could re

sult in damage, personal injury or death.

Never use oxygen to pressurize or purge

refrigeration lines. Oxygen, when exposed

to a spark or open flame, can cause fire

and/or an explosion, that could result in

property damage, personal injury or death.

WARNING

Polyol ester (POE) oils used with HFC-410A

refrigerant absorb moisture very quickly. It is very

important that the refrigerant system be kept closed

as much as possible. DO NOT remove line set caps

or service valve stub caps until you are ready to make

connections.

IMPORTANT !

Some scroll compressors have an internal vacuum

protection devices that will unload scrolls when

suction pressure goes below 20 psig. A hissing

sound will be heard when the compressor is run

ning unloaded. The protection device will reset

when pressure in system rises above 40 psig. This

is normal operation. DO NOT replace compressor.

This manual suits for next models

Table of contents

Other Lennox Heat Pump manuals

Lennox

Lennox 16ACX Series Installation and operation manual

Lennox

Lennox 14HPX User manual

Lennox

Lennox LRP16G User manual

Lennox

Lennox 12HPB Series User manual

Lennox

Lennox HSXA16-024 User manual

Lennox

Lennox 13HPX Installation and operation manual

Lennox

Lennox MS8 SERIES User manual

Lennox

Lennox 14HPX User manual

Lennox

Lennox HPXA12 SERIES Planning guide

Lennox

Lennox 12HPB Series User manual

Lennox

Lennox Magic-Pak PWC182 User manual

Lennox

Lennox ZHA036 User manual

Lennox

Lennox INNOV DM R Series User guide

Lennox

Lennox XPG20 User manual

Lennox

Lennox Elite series User manual

Lennox

Lennox LHT Series Owner's manual

Lennox

Lennox TPA036S2 User manual

Lennox

Lennox HP29 Series Installation and operation manual

Lennox

Lennox XP15 User manual

Lennox

Lennox LRP14G User manual

Lennox

Lennox XPG20 User manual

Lennox

Lennox Elite XP13018 Service manual

Lennox

Lennox XP14 Installation and operation manual

Lennox

Lennox XP17-024-230-01 Manual

Popular Heat Pump manuals by other brands

MICROWELL

MICROWELL HP 1000 GREEN Installation and user manual

Sanyo

Sanyo SAP120FCH Service manual

Daikin

Daikin EHYHBH05AA Operation manual

Panasonic

Panasonic WH-SDF03E3E5 Design handbook

Bryant

Bryant 544B Specifications

Airxcel

Airxcel 45000 Series Installation, operation and maintenance instructions

Mitsubishi Electric

Mitsubishi Electric PUZ-SWM60VAA Service manual

Dimplex

Dimplex LI 16I-TUR Installation and operating instruction

Carrier

Carrier WSHP Open v3 Integration guide

TGM

TGM CTV14CN018A Technical manual

Carrier

Carrier 38MGQ Series installation instructions

Kokido

Kokido K2O K880BX/EU Owner's manual & installation guide

Viessmann

Viessmann VITOCAL 300-G PRO Type BW 2150 Installation and service instructions

Carrier

Carrier 48EZN installation instructions

Viessmann

Viessmann KWT Vitocal 350-G Pro Series Installation and service instructions for contractors

Ariston

Ariston NIMBUS user manual

Weishaupt

Weishaupt WWP L 7 Installation and operating instruction

GE Zoneline AZ85H09EAC datasheet