Lennox SSB036H4S4, SSB060H4S4, SSB048H4S4 Installation Instructions Manual

INSTALLATION

2013 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.

WARNING

Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.

Installation and service must be performed by a licensed
professional installer (or equivalent) or a 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.

INSTRUCTIONS

S-CLASS SSB*H4 Units

AIR CONDITIONER UNITS

507163-01
6/2013
Supersedes 506641-01

TABLE OF CONTENTS

Shipping and Packing List 1......................

General 1......................................

Unit Dimensions 2...............................

Model Number Identification 2....................

Unit Parts Arrangement 3........................

Operating Gauge Set and Service Valves 4.........

Recovering Refrigerant from Existing System 6.....

New Unit Placement 7...........................

Removing and Installing Panels 9.................

New or Replacement Line Set 10...................

Brazing Connections 12...........................

Flushing Line Set and Indoor Coil 15................

Installing Indoor Metering Device 16................

Leak Test Line Set and Indoor Coil 17...............

Evacuating Line Set and Indoor Coil 18.............

Electrical 19.....................................

Servicing Units Delivered Void of Charge 21.........

Unit Start-Up 21.................................

System Refrigerant 22............................

System Operation 25.............................

Maintenance 26..................................

Checklists 27....................................

Litho U.S.A.

IMPORTANT

This unit must be matched with an indoor coil as speci
fied in Lennox SSB*H4 Product Specification bulletin.
Coils previously charged with HCFC-22 must be
flushed.

NOTICE TO INSTALLER

UNIT PLACEMENT

It is critical for proper unit operation to place outdoor unit on an
elevated surface as described in Unit Placement section on page 7.

BRAZING LINE SET TO SERVICE VALVES

It is imperative to follow the brazing technique illustrated starting on
page 12 to avoid damaging the service valve's internal seals.

6/2013 507163-01

*2P62013* *P507163-01*

Shipping and Packing List

Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.

1 - Assembled outdoor unit.

General

Two-stage S-Class SSB*H4 outdoor units use
HFC-410A refrigerant. This unit must be installed with a
matching indoor coil and line set as outlined in the Product
Specification bulletin. S-Class SSB*H4 outdoor units
are designed for use in expansion valve systems (TXV)
only. They are not designed to be used with other
refrigerant flow control devices. The Product Specification
bulletin lists a TXV kit that must be ordered separately.

Page 1

Unit Dimensions - Inches (mm)

UNIT SUPPORT

FEET

C

DISCHARGE AIR

D

E

F

G

BASE WITH ELONGATED LEGS

LIQUID LINE
CONNECTION

ELECTRICAL
INLETS

SUCTION LINE
CONNECTION

08)

4-3/4
(121)

4-1/4(1

K

J

H

B

A

2 (51)

SIDE VIEW

Model

Number

SSB036H4S4

SSB048H4S4

SSB060H4S4

A B C D E F G H J K

31 (787) 30-1/2 (775) 35 (889)

39 (991) 30-1/2 (775) 35 (889)

45 (1143) 35-1/2 (902) 39-3/8 (1001) 16-7/8 (429) 8-3/4 (222) 3-1/8 (79) 30-3/4 (781) 4-5/8 (117) 3-3/4 (95) 26-7/8 (683)

Model Number Identification

S = S-Class Product Line

S = Air Conditioner Outdoor Unit

Brand/Family

Unit Type

Major Design Sequence

A = 1st Generation

B = 2nd Generation

Nominal Cooling Capacity -

1 (25)

13-7/8 (352) 7-3/4 (197) 3-1/4 (83) 27-1/8 (689) 3-5/8 (92) 4-1/2 (114) 20-5/8 (524)

SIDE VIEW

SSB Y1036 H 44 S

Vol t ag e

Y = 208/230V‐3 phase‐60hz
G = 460V‐3 phase‐60hz

Minor Design Sequence

1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision

Coil type

4 = Four-sided

Tons

036 = 3 Tons
048 = 4 Tons
060 = 5 Tons

Cooling Efficiency

H = High Efficiency

Part Load Capability

S = Part load capabilities with multi-stage operation.

Refrigerant Type

4 = HFC-410A

507163-01 05/13

Page 2

Typical Unit Parts Arrangement

CRANKCASE HEATER RELAY

(K-191) (G-VOLTAGE UNITS

ONLY)

CONTROL PANEL

DUAL RUN CAPACITOR

THREE POLE CONTACTOR (K1)

(C12)

GROUND)

PLUMBING, SWITCHES AND ELECTRICAL COMPONENTS

COMPRESSOR

COMPRESSOR

HARNESS

CRANKCASE

THERMOSTAT

(S40)

LIQUID LINE FILTER

DRIER (SINGLE FLOW)

LIQUID LINE SERVICE

VALV E

FIELD CONNECTION

FOR LIQUID LINE SET

Figure 1. Typical Parts Arrangements

Page 3

CRANKCASE HEATER
(HR1)

HIGH PRESSURE SWITCH
(MANUAL RESET) (S4)

LOW PRESSURE
SWITCH (S87)

SUCTION LINE
SERVICE VALVE

FIELD CONNECTION
FOR SUCTION LINE

SSB*H4 SERIES

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.

CAUTION

Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.

Operating Gauge Set and Service Valves

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.

TORQUE REQUIREMENTS

When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.

IMPORTANT

Only use Allen wrenches of sufficient hardness (50Rc ­Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.

Service valve stems are factory-torqued (from 9 ft-lbs for
small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.

See the Lennox Service and Application Notes #C-08-1
for further details and information.

IMPORTANT

To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.

Table 1. Torque Requirements

Parts Recommended Torque

Service valve cap 8 ft.- lb. 11 NM

Sheet metal screws 16 in.- lb. 2 NM

Machine screws #10 28 in.- lb. 3 NM

Compressor bolts 90 in.- lb. 10 NM

Gauge port seal cap 8 ft.- lb. 11 NM

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.

Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 psig on the high side and a low
side of 30” vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.

Each valve is equipped with a service port which has a
factory-installed valve stem. Figure 2 provides information
on how to access and operating both angle and ball service
valves.

507163-01 05/13

Page 4

Operating Angle-Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back
the stem out counterclockwise as far as it will go.

SERVICE PORT CAP

SERVICE PORT CORE

(VALVE STEM SHOWN

TO INDOOR

UNIT

(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE

CLOSED) INSERT HEX
WRENCH HERE

SERVICE PORT

CORE

TO OUTDOOR UNIT

ANGLE-TYPE SERVICE VALVE

(BACK-SEATED / OPENED)

When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.

Operating Ball-Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. To open valve, use a wrench to rotate stem counterclockwise
90°. To close, rotate stem clockwise 90°.

TO INDOOR UNIT

TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM
CLOCKWISE 90°.

SERVICE PORT

SERVICE PORT

SERVICE PORT

CORE

CAP

TO OUTDOOR

UNIT

BALL (SHOWN
CLOSED)

VALV E
STEM

STEM CAP

STEM CAP

ANGLE-TYPE SERVICE VALVE

(FRONT-SEATED / CLOSED)

WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN
TO

THE LINE SET AND INDOOR UNIT.

To Access Service Port:

A service port cap protects the service port core from contamination and
serves as the primary leak seal.

1. Remove service port cap with an appropriately sized wrench.

2. Connect gauge set to service port.

3. When testing is completed, replace service port cap and tighten as
follows:

 With torque wrench: Finger tighten and

torque cap per table 1.

 Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.

Reinstall Stem Cap:

Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:

9

10

8

11

12

7

6

 With torque wrench: Finger tighten and

then torque cap per table 1.

 Without torque wrench: Finger tighten

and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.

9

10

8

11

12

7

6

1/6 TURN

1

2

3

4

5

1/12 TURN

1

2

3

4

5

NOTE - A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

Figure 2. Angle and Ball-Type Service Valves

Page 5

SSB*H4 SERIES

Recovering Refrigerant from Existing System

DISCONNECT POWER

Disconnect all power to the existing outdoor unit at the disconnect

12

switch or main fuse box/breaker panel.

MAIN FUSE BOX/BREAKER PANEL

MAIN FUSE

BOX/BREAKER

PANEL

DISCONNECT

SWITCH

RECOVER REFRIGERANT

Remove existing HCFC-22 refrigerant using one of the following procedures:

3

IMPORTANT - Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,

and/or long line sets.

CONNECT MANIFOLD GAUGE SET

Connect a gauge set, clean recovery cylinder and a recovery
machine to the service ports of the existing unit. Use the
instructions provided with the recovery machine to make the
connections.

MANIFOLD GAUGES

RECOVERY MACHINE

LOW

CLEAN RECOVERY
CYLINDER

OUTDOOR UNIT

HIGH

METHOD 1:

Us this method if the existing outdoor unit is not equipped with shut-off valves, or if the unit is not operational and you plan to use the existing
HCFC-22 to flush the system.

Remove all HCFC-22 refrigerant from the existing system. Check gauges after shutdown to confirm that the system is completely void of refriger
ant.

METHOD 2:

Use this method if the existing outdoor unit is equipped with manual shut-off valves, and you plan to use new HCFC-22 refrigerant to flush the
system.

The following devices could prevent full system charge recovery into the outdoor unit:

 Outdoor unit's high or low-pressure switches (if applicable), when tripped, can cycle the compressor OFF.
 Compressor can stop pumping due to tripped internal pressure relief valve.
 Compressor has internal vacuum protection that is designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets

a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum.
Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and

internal seals.)
Once the compressor cannot pump down to a lower pressure due to one of the above system conditions, shut off the vapor valve. Turn OFF the
main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set.

Perform the following task:
A Start the existing HCFC-22 system in the cooling mode and close the liquid line valve.
B Use the compressor to pump as much of the existing HCFC-22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit

main power OFF and use a recovery machine to remove the remaining refrigerant from the system.

Note - It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation.

C When the low side system pressures reach 0 psig, close the vapor line valve.
D Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.

Figure 3. Recovering Refrigerant

507163-01 05/13

Page 6

CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)

12 (305)

6 (152)

36 (914)

ACCESS PANEL

CONTROL PANEL

ACCESS

LOCATION

30 (762)

LINE SET
CONNECTIONS

MINIMUM CLEARANCE BETWEEN

TWO UNITS

24 (610)

Figure 4. Installation Clearances

NOTES:

 Clearance to one of the other three

sides must be 36 inches (914mm).

 Clearance to one of the remaining

two sides may be 12 inches
(305mm) and the final side may be
6 inches (152mm).

MINIMUM CLEARANCE

ABOVE UNIT

48 (1219)

New Unit Placement

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

See Unit Dimensions on page 3 for sizing mounting slab,
platforms or supports. Refer to figure 4 for mandatory
installation clearance requirements.

POSITIONING CONSIDERATIONS

Consider the following when positioning the unit:

 Some localities are adopting sound ordinances based

on the unit's sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.

 When possible, do not install the unit directly outside

a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 5,
detail A.

PLACING UNIT ON SLAB

When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 5,
detail B.

NOTE - If necessary for stability, anchor unit to slab as
illustrated in figure 5, detail D.

IMPORTANT

To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace.

ELEVATING THE UNIT

Units are outfitted with elongated support feet as illustrated
in figure 5, detail C.

If additional elevation is necessary, raise the unit by
extending the height of the unit support feet. This may be
achieved by using a 2 inch (50.8mm) Schedule 40 female
threaded adapter.

The specified coupling will fit snuggly into the recessed
portion of the feet. Use additional 2 inch (50.8mm)
Schedule 40 male threaded adaptors which can be
threaded into the female threaded adaptors to make
additional adjustments to the level of the unit.

NOTE - Keep the height of extenders short enough to
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field-fabricated
framework that is sturdy enough for greater heights.

Page 7

SSB*H4 SERIES

DETAIL A

Install unit away from windows.

— Outside Unit Placement

DETAIL B

Install unit level or, if on a slope, maintain slope tolerance of two (2)
degrees (or two inches per five feet [50 mm per 1.5 m]) away from
building structure.

— Slab Mounting at Ground Level

BUILDING

STRUCTURE

MOUNTING
SLAB

TWO 90° ELBOWS INSTALLED IN LINE SET WILL

REDUCE LINE SET VIBRATION.

DETAIL C

— Elevated Slab Mounting

using Feet Extenders

LEG DETAIL

2” (50.8MM) SCH 40

FEMALE THREADED

ADAPTER

BASE

GROUND LEVEL

STABILIZING UNIT ON UNEVEN SURFACES

DETAIL D

#10 1/2” LONG SELF-DRILLING

SHEET METAL SCREWS

STABILIZING BRACKET (18 GAUGE

METAL — 2” WIDTH; HEIGHT AS

#10 1-1/4” LONG HEX HD SCREW

Concrete slab — use two plastic
anchors (hole drill 1/4”)

Wood or plastic slab — no plastic an
chor (hole drill 1/8”)

DETAIL E

Stabilizing bracket (18 gauge metal — 2” (50.8mm) width; height as required); bend to form
right angle as exampled below.

— Slab Side Mounting

REQUIRED)

AND FLAT WASHER

— Deck Top Mounting

MINIMUM ONE

PER SIDE

COIL

BASE PAN

CORNER POST

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.

IMPORTANT - To help stabilize an outdoor unit, some installations may require strapping the unit to the pad using brackets and anchors
commonly available in the marketplace.

Figure 5. Placement, Slab Mounting and Stabilizing Unit

507163-01 05/13

SAME FASTENERS AS
SLAB SIDE MOUNTING.

One bracket per side (minimum). For extra stability, two brackets per side, two inches
(51mm) from each corner.

FOR EXTRA

STABILITY

Page 8

ROOF MOUNTING

Removing and Installing Panels

Install the unit a minimum of 6 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.

NOTICE

Roof Damage!
This system contains both refrigerant and oil. Some

rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.

LOUVERED PANEL REMOVAL

Remove the louvered panels as follows:

1. Remove two screws, allowing the panel to swing open slightly.

2. Hold the panel firmly throughout this procedure. Rotate bottom corner of

panel away from hinged corner post until lower three tabs clear the slots as
illustrated in detail B.

3. Move panel down until lip of upper tab clears the top slot in corner post as

illustrated in detail A.

LOUVERED PANEL INSTALLATION

Position the panel almost parallel with the unit as illustrated in detail D with the
screw side as close to the unit as possible. Then, in a continuous motion:

1. Slightly rotate and guide the lip of top tab inward as illustrated in detail A and
C; then upward into the top slot of the hinge corner post.

2. Rotate panel to vertical to fully engage all tabs.

3. Holding the panel's hinged side firmly in place, close the right-hand side of
the panel, aligning the screw holes.

4. When panel is correctly positioned and aligned, insert the screws and
tighten.

IMPORTANT

Do not allow panels to hang on unit by top tab. Tab is for
alignment and not designed to support weight of panel.

WARNING

To prevent personal injury, or damage to panels, unit or
structure, be sure to observe the following:

While installing or servicing this unit, carefully stow all
removed panels out of the way, so that the panels will not
cause injury to personnel, nor cause damage to objects
or structures nearby, nor will the panels be subjected to
damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any
weather conditions, especially windy conditions, that
may cause panels to be blown around and battered.

IMPORTANT! DO NOT ALLOW PANELS TO HANG ON UNIT BY TOP TAB. TAB IS FOR
ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL.

PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR
ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.

SCREW

LIP

DETAIL A

DETAIL B

HOLES

Detail C

MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL
WITH THE UNIT AS POSSIBLE) WHILE INSTALLING PANEL.

ANGLE MAY BE TOO
EXTREME

PREFERRED ANGLE
FOR INSTALLATION

HOLD DOOR FIRMLY TO THE HINGED

SIDE TO MAINTAIN

FULLY-ENGAGED TABS

Figure 6. Removing and Installing Panels

Page 9

ROTATE IN THIS DIRECTION;

THEN DOWN TO REMOVE

PANEL

SSB*H4 SERIES

New or Replacement Line Set

REFRIGERANT LINE SET

This section provides information on installation or
replacement of existing line set. If new or replacement line
set is not being installed then proceed to Brazing
Connections on page 12.

IMPORTANT

Lennox highly recommends changing line set when
converting the existing system from HCFC-22 to
HFC-410A. If that is not possible and the line set is the
proper size as reference in table 2, use the procedure
outlined under Flushing the System on page 13.

If refrigerant lines are routed through a wall, then seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. See figure 7 for recommended
installation practices. Also, consider the following when
placing and installing a high-efficiency outdoor unit.

Liquid lines that meter the refrigerant, such as RFC1 liquid
lines, must not be used in this application. Existing line set
of proper size as listed in table 2 may be reused. If system
was previously charged with HCFC-22 refrigerant, then
existing line set must be flushed (see Flushing Line Set

and Indoor Coil on page15).

NOTE - When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351-L9, or contact
Lennox Technical Support Product Applications for
assistance.

To obtain the correct information from Lennox, be sure to
communicate the following information:

 Model SSB*H4 and size of unit (e.g. -036).

 Line set diameters for the unit being installed as listed

in table 2 and total length of piping.

 Number of elbows vertical rise or drop in the piping.

The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds - add one
ounce of oil for every five pounds of refrigerant.

Recommended topping-off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE RL32CF.

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.

Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit to the indoor unit coil (braze
connections). Use Lennox L15 (sweat, non-flare) series
line set or field-fabricated refrigerant line sizes as listed in
table 2.

Table 2. Refrigerant Line Set — Inches (mm)

Model Number

SSB036H4S4

SSB048H4S4

SSB060H4S4 3/8 in. (10 mm) 1-1/8 in. (29 mm) 3/8 in. (10 mm) 1-1/8 in. (29 mm) Field Fabricated

NOTE - Some applications may required a field provided 7/8” to 1-1/8” adapter

Liquid Line Vapor Line Liquid Line Vapor Line L15 Line Sets

3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in (22 mm) L15-65 — 15 ft. - 50 ft. (4.6 m - 15 m)

Field Connections Recommended Line Set

Mineral oils are not compatible with HFC-410A. If oil

must be added, it must be a Polyol Ester oil.

IMPORTANT

507163-01 05/13

Page 10

Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation:

REFRIGERANT LINE SET — TRANSITION

FROM VERTICAL TO HORIZONTAL

ANCHORED HEAVY NYLON

WIRE TIE OR AUTOMOTIVE

MUFFLER‐TYPE HANGER

WALL
STUD

NON-CORROSIVE

METAL SLEEVE

AUTOMOTIVE

MUFFLER‐TYPE HANGER

STRAP LIQUID LINE TO
VAPOR LINE

LIQUID LINE

VAPOR LINE - WRAPPED
IN ARMAFLEX

REFRIGERANT LINE SET — INSTALLING

HORIZONTAL RUNS

To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.

WIRE TIE (AROUND
VAPOR LINE ONLY)

8 FEET (2.43 METERS)

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR
WIRE TIE

FLOOR JOIST OR

ROOF RAFTER

8 FEET (2.43 METERS)

NON-CORROSIVE
METAL SLEEVE

STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.

TAPE OR
WIRE TIE

REFRIGERANT LINE SET — INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

NOTE - Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.

OUTSIDE WALL

WOOD BLOCK

BETWEEN STUDS

VAPOR LINE WRAPPED

WITH ARMAFLEX

OUTSIDE

WALL

PVC

PIPE

FIBERGLASS

INSULATION

VAPOR LINE

SLEEVE

CAULK

LIQUID
LINE

NOTE - Similar installation practices should be used if line set is
to be installed on exterior of outside wall.

LIQUID LINE

WIRE TIE

INSIDE WALL

STRAP

NON-CORROSIVE
METAL SLEEVE

WIRE TIE

WOOD BLOCK

WIRE TIE

STRAP

FLOOR JOIST OR

ROOF RAFTER

Figure 7. Line Set Installation

Page 11

SSB*H4 SERIES

Brazing Connections

Use the procedures outline in figures 8 and 9 for brazing
line set connections to service valves.

WARNING

Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture - Check the high and low
pressures before applying heat.

IMPORTANT

Connect gauge set low pressure side to vapor line
service valve and repeat procedure starting at
paragraph 4 for brazing the liquid line to service port
valve.

IMPORTANT

Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.

WARNING

When using a high pressure gas such as
dry 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).

CAUTION

Brazing alloys and flux contain materials which are
hazardous to your health.

Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well-ventilated
areas.

Wear gloves and protective goggles or face shield to
protect against burns.

Wash hands with soap and water after handling brazing
alloys and flux.

IMPORTANT

Use silver alloy brazing rods with 5% minimum silver
alloy for copper-to-copper brazing. Use 45% minimum
alloy for copper-to-brass and copper-to-steel brazing.

WARNING

Fire, Explosion and Personal Safety Haz
ard.

Failure to follow this warning could result
in damage, personal injury or death.

Never use oxygen to pressurize or purge
refrigeration lines. Oxygen, when ex
posed to a spark or open flame, can
cause fire and/or an explosion, that could
result in property damage, personal inju
ry or death.

507163-01 05/13

Page 12

CUT AND DEBUR

Cut ends of the refrigerant lines square (free from nicks or dents)

1

and debur the ends. The pipe must remain round. Do not crimp end
of the line.

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

SERVICE VALVE

COPPER TUBE

REDUCER

CONNECTION

STUB

LINE SET SIZE IS SMALLER

THAN CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

CAP AND CORE REMOVAL

Remove service cap and core from both the

2

vapor and liquid line service ports.

SERVICE PORT

CAP

SERVICE

PORT
CORE

LIQUID LINE SERVICE

VALV E

SUCTION / VAPOR LINE

SERVICE VALVE

ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES

3

Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.

A Connect gauge set low pressure side to

liquid line service valve (service port).

B Connect gauge set center port to bottle of

nitrogen with regulator.

C Remove Schrader valve in suction / vapor

line service port to allow nitrogen to escape.

ATTACH

GAUGES

HIGHLOW

USE REGULATOR TO FLOW

NITROGEN AT 1 TO 2 PSIG.

SERVICE

PORT
CORE

SERVICE
PORT CAP

SUCTION / VAPOR SERVICE PORT MUST BE

OPEN TO ALLOW EXIT POINT FOR NITROGEN

VAPOR LINE

INDOOR

UNIT

LIQUID LINE

C

LIQUID LINE SERVICE

SUCTION /

VAPOR LINE

SERVICE

VALV E

VALV E

B

WHEN BRAZING LINE SET TO

A

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Figure 8. Brazing Procedures

OUTDOOR

UNIT

NITROGEN

Page 13

SSB*H4 SERIES

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap a saturated cloth around service valve bodies and copper tube stub. Use another

saturated cloth underneath the valve body to protect the base paint.4

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 suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections

5

BRAZE LINE SET

Wrap both service valves with a saturated cloth as illustrated here before brazing to line set.

6

LIQUID LINE SERVICE VALVE

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

IMPORTANT - Allow braze joint to cool. Apply additional

saturated cloths to help cool brazed joint. Do not
remove wet rag until piping has cooled. Temperatures

SATURATED CLOTH

above 250ºF will damage valve seals.

LIQUID LINE

WARNING

1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE will result if you do not wrap a wet cloth

around both liquid and suction line service valve
bodies and copper tube stub while brazing in the line
set! The braze, when complete, must be quenched
with water to absorb any residual heat.

2. Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated.
Refer to procedures provided in this supplement.

SUCTION / VAPOR LINE

SUCTION / VAPOR LINE

SERVICE VALVE

SATURATED CLOTH

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

PREPARATION FOR NEXT STEP

After all connections have been brazed, disconnect manifold gauge set from service ports. Apply saturated rags to both services valves to cool

7

piping. Once piping is cool, remove all wet cloths. Refer to the unit installation instructions for the next step in preparing the unit.

Figure 9. Brazing Procedures (continued)

507163-01 05/13

Page 14

Flushing Line Set and Indoor Coil

TYPICAL EXISTING FIXED ORIFICE

1A

DISTRIBUTOR

ASSEMBLY

A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as

sembly.

C Using two wrenches, disconnect liquid line from liquid line orifice hous

ing. Take care not to twist or damage distributor tubes during this pro
cess.

D Remove and discard fixed orifice, valve stem assembly if present and

Teflon® washer as illustrated above.

E Use a field-provided fitting to temporary reconnect the liquid line to the

indoor unit's liquid line orifice housing.

COIL SHOWN)

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

REMOVE AND DISCARD

WHITE TEFLON

(IF PRESENT)

TEFLON® RING

FIXED ORIFICE

®

SEAL

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

REMOVAL PROCEDURE (UNCASED

OR

BRASS NUT

1B

TWO PIECE PATCH PLATE

CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE

2

INVERTED HCFC-22
CYLINDER CONTAINS
CLEAN HCFC-22 TO BE
USED FOR FLUSHING.

A

1

VAPOR LINE

SERVICE VALVE

EXISTING

INDOOR

UNIT

LIQUID LINE SERVICE

RECOVERY

CYLINDER

VALV E

LIQUID

VAPOR

OUTDOOR

B

NEW

UNIT

OPENED

C

D

RECOVERY MACHINE

A Inverted HCFC-22 cylinder with clean refrigerant to the vapor service

valve.

B HCFC-22 gauge set (low side) to the liquid line valve.
C HCFC-22 gauge set center port to inlet on the recovery machine with an

empty recovery tank to the gauge set.

D Connect recovery tank to recovery machines per machine instructions.

GAUGE

MANIFOLD

LOW HIGH

CLOSED

TANK
RETURN

INLET

DISCHARGE

TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)

ORIFICE

HOUSING

EQUALIZER
LINE

STUB END

TEFLON
RING

VAPOR

EXPANSION

VALV E

®

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

LINE

TEFLON

RING

®

SENSING

LINE

LIQUID

(UNCASED COIL ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER

LINE FITTING

A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Disconnect the equalizer line from the expansion valve equalizer line

fitting on the vapor line.
D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the expansion valve at the liquid line

assembly.
F Disconnect the expansion valve from the liquid line orifice housing.

Take care not to twist or damage distributor tubes during this process.
G Remove and discard expansion valve and the two Teflon® rings.
H Use a field-provided fitting to temporary reconnect the liquid line to the

indoor unit's liquid line orifice housing.

LIQUID LINE

SENSING BULB

FLUSHING LINE SET

The line set and indoor unit coil must be flushed with at least the

3

same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.

A Set the recovery machine for liquid recovery and start the

recovery machine. Open the gauge set valves to allow the
recovery machine to pull a vacuum on the existing system line

B

set and indoor unit coil.

B Invert the cylinder of clean HCFC-22 and open its valve to allow

liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.

C After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the HCFC-22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.

D Close the valve on the inverted HCFC-22 drum and the gauge

set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.

LINE

Figure 10. Installing Indoor Expansion Valve

Page 15

SSB*H4 SERIES

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use a
expansion valve metering device at the indoor coil.

See the Lennox SSB*H4 Product Specification bulletin for
approved expansion valve kit match-ups. The expansion
valve unit can be installed either internal or external to the

indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the expansion
valve in a manner that will provide access for field servicing
of the expansion valve. Refer to below illustration for
reference during installation of expansion valve unit.

INDOOR EXPANSION VALVE INSTALLATION

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)

(Uncased Coil Shown)

LIQUID LINE

ORIFICE

HOUSING

STUB

END

TEFLON
RING

EQUALIZER
LINE

VAPOR

EXPANSION

VALV E

®

ASSEMBLY WITH

LINE

TEFLON

RING

LIQUID LINE

BRASS NUT

LIQUID LINE

Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.

EQUALIZER LINE INSTALLATION

A Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure to the right.

B Remove the field-provided fitting that temporarily recon

nected the liquid line to the indoor unit's distributor assem
bly

®

SENSING

LINE

C Install one of the provided Teflon® rings around the

stubbed end of the expansion valve and lightly lubricate
the connector threads and expose surface of the Teflon
ring with refrigerant oil.

D Attach the stubbed end of the expansion valve to the

liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or tighten to
20 ft-lb.

E Place the remaining Teflon® washer around the other

end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon® ring with
refrigerant oil.

F Attach the liquid line assembly to the expansion valve.

Finger tighten and use an appropriately sized wrench to
turn an additional 1/2 turn clockwise as illustrated in the
figure above or tighten to 20 ft-lb.

SENSING BULB INSTALLATION

A Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and
screws provided.

NOTE - Confirm proper thermal contact between vapor line
and expansion valve sensing bulb before insulating the
sensing bulb once installed.

B Connect the equalizer line from the expansion valve to

the equalizer vapor port on the vapor line. Finger tighten
the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below.

9 O'CLOCK TO

3 O'CLOCK

ON LINES SMALLER THAN

BULB

12

BULB

7/8”, MOUNT SENSING
BULB BETWEEN THE 9 AND
3 O'CLOCK POSITIONS.

®

1/2 Turn

11

10

9

8

7

1/8 Turn

11

10

9

8

7

12

1

2

3

4

5

6

12

1

2

3

4

5

6

FLARE SEAL CAP

OR

Figure 11. Installing Indoor Expansion Valve

507163-01 05/13

FLARE NUT

COPPER FLARE
SEAL BONNET

MALE BRASS EQUALIZER
LINE FITTING

VAPOR LINE

Page 16

VAPOR LINE

VAPOR LINE

12

BULB

NOTE - NEVER MOUNT THE SENSING BULB ON

BOTTOM OF LINE.

BULB

ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.

IMPORTANT

The Environmental Protection Agency (EPA) prohibits
the intentional venting of HFC refrigerants during
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.

IMPORTANT

If this unit is being matched with an approved line set
or indoor unit coil which 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 installation. Take
care to empty all existing traps. Polyol ester (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 the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.

CONNECT GAUGE SET

A Connect an HFC-410A manifold gauge set high pressure

1

hose to the vapor valve service port.

NOTE - Normally, the high pressure hose is connected to the
liquid line port. However, connecting it to the vapor port better
protects the manifold gauge set from high pressure damage.

B With both manifold valves closed, connect the cylinder of

HFC-410A refrigerant to the center port of the manifold gauge
set.

NOTE - Later in the procedure,
the HFC-410A container will be
replaced by the nitrogen
container.

Leak Test Line Set and Indoor Coil

WARNING

When using a high pressure gas such as
dry 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).

IMPORTANT

Leak detector must be capable of sensing HFC
refrigerant.

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.

HIGHLOW

MANIFOLD GAUGE SET

OUTDOOR UNIT

B

A

2

TO VAPOR

SERVICE VALVE

NITROGEN

HFC-410A

TEST FOR LEAKS

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:

A With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve

on the HFC-410A cylinder (vapor only).

B Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. [A

trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC-410A cylinder
and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.

C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.

D Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set

and the indoor unit.

E 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.

F After leak testing disconnect gauges from service ports.

Figure 12. Leak Test

Page 17

SSB*H4 SERIES

Evacuating Line Set and Indoor Coil

CONNECT GAUGE SET

NOTE - Remove cores from service valves (if not already done).

1

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 liquid line service valve

C Connect micron gauge available

connector on the 1/4 SAE in-line tee.

D Connect the vacuum pump (with

vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC-410A and nitrogen containers.

NITROGEN

HFC-410A

VACUUM PUMP

OUTDOOR

UNIT

A

B

A34000 1/4 SAE TEE WITH
SWIVEL COUPLER

500

C

MICRON

GAUGE

MANIFOLD

GAUGE SET

TO VAPOR

SERVICE VALVE

TO LIQUID LINE
SERVICE VALVE

D

EVACUATE THE SYSTEM

A Open both manifold valves and start the vacuum pump.

2

B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).

NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NOTE - The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:

 Close manifold gauge valves
 Close valve on vacuum pump
 Turn off vacuum pump
 Disconnect manifold gauge center port hose from vacuum pump
 Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
 Open manifold gauge valves to break the vacuum in the line set and indoor unit.
 Close manifold gauge valves.

D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the

dry nitrogen from the line set and indoor unit.

E Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the

absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.

F When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an

upright cylinder of HFC-410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.

G Perform the following:

 Close manifold gauge valves.
 Shut off HFC-410A cylinder.
 Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core

tool while maintaining a positive system pressure.

 Replace stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated.

RECOMMEND

MINIMUM 3/8” HOSE

10

9

11

8

1/6 TURN

12

7

6

HIGHLOW

1

2

3

4

5

507163-01 05/13

Figure 13. Evacuating System

Page 18

IMPORTANT

Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.

WARNING

Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.

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 compressor parts.

Electrical

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
handler for low‐voltage control power (24VAC - 40 VA
minimum)

SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH

1

Refer to the unit nameplate for minimum circuit ampacity, and
maximum fuse or circuit breaker (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 to an earth ground.

MAIN FUSE

BOX/BREAKER

PANEL

DISCONNECT

SWITCH

UNIT LOW VOLTAGE CONNECTIONS

3

C

WIRE NUTS

INSTALL THERMOSTAT

Install room thermostat (ordered separately) on an inside wall

2

approximately in the center of the conditioned area and 5 feet
(1.5m) from the floor. It should not be installed on an outside wall
or where it can be affected by sunlight or drafts.

THERMOSTAT

5 FEET

(1.5M)

NOTE - 24VAC, Class II circuit connections are made in the control
panel.

HIGH VOLTAGE FIELD WIRING

FACTORY WIRING

LOW VOLTAGE (24V) FIELD WIRING

WIRE RUN LENGTH AWG# INSULATION TYPE

LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING

MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.

BLUE

CUTOUT WITH

GROMMET

A

24V CONTROL WIRES

BLACK

B

YELLOW

D

Page 19

A Run 24VAC control wires through cutout with grommet.
B Run 24VAC control wires through wire tie.
C Make 24VAC control wire connections using field provided wire

nuts.

D Tighten wire tie to security 24V control wiring.

NOTE - FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRES)
GAUGE PER TABLE ABOVE.

NOTE - WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND TO MAINTAIN
SEPARATION OF FIELD INSTALLED LOW AND HIGH VOLTAGE CIRCUITS.

NOTE - DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL
BOX.

TIGHTEN WIRE TIE

SSB*H4 SERIES

Figure 14. Typical Wiring Diagram (Y-Voltage)

Figure 15. SSB*H4 Typical Factory Diagram (Y-Voltage)

507163-01 05/13

Page 20

Figure 16. SSB*H4 Typical Wiring Diagram (G-Voltage)

Figure 17. SSB*H4 Typical Factory Diagram (G-Voltage)

Servicing Units Delivered Void of Charge

If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.

1. Leak check system using procedure outlined on page

17.

2. Evacuate the system using procedure outlined on
page 18.

3. Use nitrogen to break the vacuum and install a new
filter drier in the system.

4. Evacuate the system again using procedure outlined
on page 18.

Page 21

SSB*H4 SERIES

5. Weigh in refrigerant using procedure outlined in figure

21.

6. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not

verified, the compressor will fail in the future.

4. Replace the stem caps and tighten to the value listed
in table 1.

5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected.

Unit Start-Up

IMPORTANT

If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.

1. Rotate fan to check for binding.

2. Inspect all factory- and field-installed wiring for loose
connections.

3. After evacuation is complete, open both the liquid and
vapor line service valves to release the refrigerant
charge contained in outdoor unit into the system.

GAUGE SET

CONNECTIONS FOR TESTING AND CHARGING

SUCTION LINE

B

SERVICE PORT

A Close manifold gauge set valves and

connect the center hose to a cylinder of
HFC-410A. Set for liquid phase
charging.

B Connect the manifold gauge set's low

pressure side to the suction line service
port.

C Connect the manifold gauge set's high

pressure side to the liquid line service
port.

D Position temperature sensor on liquid

line near liquid line service port.

TEMPERATURE

D

SENSOR

CONNECTION

CHARGE IN

LIQUID PHASE

REFRIGERANT TANK

DIGITAL SCALE

6. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.

7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.

8. Check system for sufficient refrigerant by using the
procedures listed under System Charge.

System Refrigerant

This section outlines procedures for:

1. Connecting gauge set for testing and charging;

2. Checking and adjusting indoor airflow;

3. Adding or removing refrigerant.

MANIFOLD GAUGE SET

LOW

A

TO LIQUID

LINE SERVICE

VALV E

C

HIGH

TEMPERATURE SENSOR

(LIQUID LINE)

OUTDOOR UNIT

VAPOR LINE

SERVICE VALVE

LIQUID LINE

SERVICE VALVE

Figure 18. Gauge Set Setup and Connections

507163-01 05/13

Page 22

CHECKING AIR FLOW AT INDOOR COIL

Temp.
of air
entering
indoor
coil ºF

A

Wet-bulb ºF

53º

DRY

BULB

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

Dry-bulb

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

57 58 59 60 61 62 63 64 65 66 67 68 69 70

T

C

Drop

19º

All temperatures are
expressed in ºF

DT

air flowair flow

INDOOR
COIL

B

B

64º

Figure 19. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart

START: Determine how refrigerant is metered

WET

BULB

A

72º

DRY

BULB

1. Determine the desired DT—Measure entering air temperature
using dry bulb (A) and wet bulb (B). DT is the intersecting value of

A and B in the table (see triangle).

2. Find temperature drop across coil—Measure the coil's dry bulb

entering and leaving air temperatures (A and C). Temperature Drop
Formula: (T

3. Determine if fan needs adjustment—If the difference between the

measured T
adjustment is needed. See examples: Assume DT = 15 and A

) = A minus C.

Drop

and the desired DT (T

Drop

–DT) is within +3º, no

Drop

temp. = 72º, these C temperatures would necessitate stated ac
tions:

Cº T

53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = -1 (within +3º range) no change
62º 10 – 15 = -5 Decrease the airflow

4. Adjust the fan speed—See indoor unit instructions to increase/de

– DT = ºF ACTION

Drop

crease fan speed.

Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +

3º.

WHEN TO CHARGE?

 Warm weather best
 Can charge in colder weather

CHARGE METHOD? Determine by:

 Metering device type
 Outdoor ambient temperature

REQUIREMENTS:

 Sufficient heat load in structure
 Indoor temperature between 70‐80ºF (21-26ºC)
 Manifold gauge set connected to unit
 Thermometers:

- to measure outdoor ambient temperature

- to measure liquid line temperature

- to measure suction line temperature

Figure 20. Determining Charge Method

WEIGH-IN

CHARGING METHOD FOR LONG LINE SETS

64ºF (17.7ºC) and Below

Adjust amount for variation in

Amount specified

on nameplate

line set length and liquid line
diameter using table below.

+

Liquid Line

Set Diameter

5/16”

3/8”

1/2”

=

HFC-410A

(ounces per foot)

0.40

0.60

1.00

Total charge

TXV

64ºF (17.7ºC)

and Below

WEIGH‐IN

65ºF (18.3ºC)

and Above

APPROACH OR

SUBCOOLING

NOTE - Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or
greater than 20 psig.

NOTE - The above nameplate is for illustration purposes only. Go to
actual nameplate on outdoor unit for charge information.

Charging Formula for Liquid Line Charge Adjustments

[(Line set oz./ft. x total length)  (factory charge for line set)] = charge adjustment

Example: Units are factorycharged for 15 feet (4.6 meters) of 3/8" line set.
Factory charge for 3/8" is 0.60 oz/ft x 15 = 9.0 ounces.

Figure 21. Using HFC-410A Weigh-In Method

Page 23

SSB*H4 SERIES

START: Measure outdoor ambient temperature

USE WEIGH‐IN METHOD

DO NOT CHARGE UNIT

Weigh‐in or remove refrigerant

(Results of charging at low

based upon line length

temperatures not reliable)

64ºF

(17.7ºC) and

Below

APPROACH TXV

Once refrigerant charge is
correct, disconnect gauge set
and replace service port caps.

If refrigerant is added
or removed, verify
charge using the
Subcooling Method.

If value is LESS
than shown, add
refrigerant.

If value is MORE
than shown, remove
refrigerant.

MORE or

LESS

65ºF

(18.3ºC) and

Above

ABOVE or

BELOW

1. Connect gauge set as illustrated in figure 18.

2. Confirm proper airflow across coil using figure

19.

3. Compare unit pressures with table 4, Normal
Operating Pressures.

4. Set thermostat to call for heat (must have a
cooling load between 70‐80ºF (21-26ºC).

5. When heat demand is satisfied, set thermostat
to call for cooling.

6. Allow temperatures and pressures to stabilize.

7. Record outdoor ambient temperature:

AMBº =_________

8. Record liquid line temperature:

LIQº = __________

9. Subtract to determine approach (APPº):

LIQº_____ - AMBº _____ = APPº_____

10. Compare results with table below.

APPº (Approach) Values(F:+/-1.0° [C: +/-0.6°])

-036 -048 -060
TEMP* 6 (3.3) 8 (4.4) 4 (2.2)
*Temperature of air entering outdoor

coil is 65ºF (18ºC) or above.

Figure 22. Using HFC-410A Approach (TXV) Charge Method

START: Measure outdoor ambient temperature

USE WEIGH‐IN METHOD

DO NOT CHARGE UNIT

Weigh‐in or remove refrigerant

(Results of charging at low

based upon line length

temperatures not reliable)

C

SUBCOOLING TXV

BLOCK OUTDOOR COIL: [sometimes necessary with lower
temperatures] Use cardboard or plastic sheet to restrict the airflow
through the outdoor coil to achieve pressures from 325-375 psig
(2240-2585 kPa). Higher pressures are needed to check charge. Block
equal sections of air intake panels and move coverings sideways until
the liquid pressure is in the above noted ranges.

Once refrigerant charge is
correct, disconnect gauge set
and replace service port caps.

If refrigerant is added or
removed, verify charge
using the Approach
Method.

If value is LESS
than shown, add
refrigerant.

64ºF

(17.7ºC) and

Below

If value is MORE
than shown, remove
refrigerant.

MORE or

LESS

ABOVE or

BELOW

CARDBOARD OR

PLASTIC SHEETS

SCº (Subcooling) Values (F:+/-1.0° [C: +/-0.6°])

65ºF

(18.3ºC) and

Above

-036 -048 -060
TEMP* 6 (3.3) 6 (3.3) 9 (5.0)
*Temperature of air entering outdoor

coil is 65ºF (18ºC) or above.

1. Connect gauge set as illustrated in figure 18.

2. Confirm proper airflow across coil using figure 19.

3. Compare unit pressures with table 4, Normal

4. Set thermostat to call for heat (must have a cooling

5. Measure outdoor ambient temperature

6. When heat demand is satisfied, set thermostat to

7. Allow temperatures and pressures to stabilize.

8. Record liquid line temperature:

9. Measure liquid line pressure and use the value to

10. Subtract to determine subcooling (SCº):

11. Compare results with table below.

Operating Pressures.

load between 70‐80ºF (21-26ºC)

call for cooling

NOTE - If necessary, block outdoor coil to maintain
325 - 375 psig.

LIQº = ______

determine saturation temperature (see table 3):

SATº = ______

SATº_____ - LIQº _____ = SCº _____

Figure 23. Using HFC-410A Subcooling (TXV) Charge Method

507163-01 05/13

Page 24

Table 3. HFC-410A Temperature (°F) - Pressure (Psig)

°F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig

32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 11 0 365.0 125 445.9 141 545.6
33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3
34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 11 2 375.1 127 457.6 143 559.1
35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 11 3 380.2 128 463.5 144 565.9
36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 11 4 385.4 129 469.5 145 572.8
37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8
38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 11 6 396.0 131 481.6 147 586.8
39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 11 7 401.3 132 487.8 148 593.8
40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 11 8 406.7 133 494.0 149 601.0
41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 11 9 412.2 134 500.2 150 608.1
42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4
43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7
44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1
45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5
46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0

47 134.6 78 228.0 109 360.0 140 539.0

Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)

Use this table to perform maintenance checks; it is not a procedure for charging the system. Minor variations

IMPORTANT

Model SSB036H4S4 SSB048H4S4 SSB060H4S4

5F (5C)*

Liquid Suction Liquid Suction Liquid Suction

in these pressures may be due to differences in installations. Significant deviations could mean that the
system is not properly charged or that a problem exists with some component in the system.

First Stage (Low Capacity)

65 (18) 217 141 229 140 229 134
75 (24) 251 143 263 143 264 138
85 (29) 292 146 304 146 305 140
95 (35) 337 147 350 148 349 142

105 (41) 387 150 400 150 402 147

115 (46) 440 154 453 155 455 149

Second Stage (High Capacity)

65 (18) 230 137 234 135 244 129
75 (24) 265 140 269 137 282 131
85 (29) 307 141 312 140 324 133
95 (35) 354 144 359 141 371 136

105 (41) 405 146 409 143 422 139

115 (46) 460 149 465 146 474 143

*Temperature of air entering outdoor coil.
**(Liquid +10 psig; Vapor +5 psig) Typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.

System Operation

SECOND-STAGE OPERATION

If the demand defrost control (A108) receives a call for
second-stage compressor operation Y2 in heating or
cooling mode and the first‐stage compressor output is
active, the second‐stage compressor solenoid output will
be energized.

If first‐stage compressor output is active in heating mode
and the outdoor ambient temperature is below the selected
compressor lock-in temperature, the second‐stage
compressor solenoid output will be energized without the
Y2 input. If the jumper is not connected to one of the
temperature selection pins on P3 (40, 45, 50, 55°F), the
default lock-in temperature of 40°F (4.5°C) will be used.

IMPORTANT

Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.

Page 25

SSB*H4 SERIES

UNIT COMPONENTS

High Pressure Switch (S4)

This unit now employs a automatic pressure switch
located on the liquid line of the compressor. The pressure
switch (SPST, auto-reset, normally closed) removes
power form the compressor when liquid pressure rises
above factory setting (opens at 590 +

15 psig).

418 +

Low Pressure Switch (S87)

SSB*H4 units are also equipped with a low pressure switch
that is located in the vapor line of the compressor. The
switch (SPST, auto-reset, normally closed) removes
power from the compressor when vapor line pressure
drops below factory setting at 40 + 5 psi.

Crankcase Heater Relay (K191)

(G Voltage Units Only)

All 460 volt SSB units require the S40 thermostat to be
wired in series with the 24 volt coil of the K191 relay. The
contacts of the K191 control operation of crankcase heater
HR1. When ambient temperature drops below 50° F, K191
contacts close energizing HR1. When the ambient
temperature rises to 70° F the contacts open
de-energizing HR1.

Crankcase Heater (HR1) and Crankcase Thermostat

(S40)

The reference models are equipped with a 70 watt, belly
band type crankcase heater. HR1 prevents liquid from
accumulating in the compressor. HR1 is controlled by a
thermostat located on the liquid line. When liquid line
temperature drops below 50° F the thermostat closes
energizing HR1. The thermostat will open, de-energizing
HR1 once liquid line temperature reaches 70° F .

Internal Solenoid (L34)

The internal unloader solenoid controls the two-stage
operation of the compressor by shifting a slide ring
mechanism to open two by-pass ports in the first
compression pocket of the scrolls in the compressor. The
internal solenoid is activated by a 24 volt direct current
solenoid coil. The coil power requires 20VAC. The internal
wires from the solenoid in the compressor are routed to a 2
pin fusite connection on the side of the compressor shell.
The external electrical connection is made to the
compressor with a molded plug assembly. This plug
contains a full wave rectifier that converts 24 volt AC into
24 volt DC power to power the unloader solenoid. Refer to
unit diagram for internal circuitry view of plug).

Liquid Line Bi-Flow Filter Drier

The unit is equipped with a large-capacity biflow filter drier
which keeps the system clean and dry. If replacement is
necessary, order another of like design and capacity. The
replacement filter drier must be suitable for use with
HFC-410A refrigerant.

15 psig and closes at

Maintenance

DEALER

Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:

Outdoor Unit

1. Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.

2. Outdoor fan motor is prelubricated and sealed. No
further lubrication is needed.

3. Visually inspect connecting lines and coils for
evidence of oil leaks.

4. Check wiring for loose connections.

5. Check for correct voltage at the unit (with the unit
operating).

6. Check amp-draw outdoor fan motor.

UNIT NAMEPLATE: _________ ACTUAL: __________

NOTE - If owner reports insufficient cooling, the unit should
be gauged and refrigerant charge checked.

Outdoor Coil

It may be necessary to flush the outdoor coil more
frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may
contain high levels of corrosive chemicals such as salts)

 Outdoor Coil — The outdoor coil may be flushed with

a water hose.

 Outdoor Coil (Sea Coast) — Moist air in ocean

locations can carry salt, which is corrosive to most
metal. Units that are located near the ocean require
frequent inspections and maintenance. These
inspections will determine the necessary need to wash
the unit including the outdoor coil. Consult your
installing contractor for proper intervals/procedures
for your geographic area or service contract.

INDOOR UNIT

1. Clean or change filters.

2. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.

3. Check blower drive belt for wear and proper tension.

4. Check all wiring for loose connections

5. Check for correct voltage at unit (blower operating).

6. Check amp-draw on blower motor.

UNIT NAMEPLATE: _________ ACTUAL: __________

INDOOR COIL

1. Clean coil, if necessary.

2. Check connecting lines and coils for signs of oil leaks.

3. Check condensate line and clean, if necessary.

OWNER

Cleaning of the outdoor unit's coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit. The
following maintenance may be performed by the
homeowner.

507163-01 05/13

Page 26

IMPORTANT

Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.

Outdoor Coil

The outdoor unit must be properly maintained to ensure its
proper operation.

 Please contact your dealer to schedule proper

inspection and maintenance for your equipment.

 Make sure no obstructions restrict airflow to the

outdoor unit.

 Grass clippings, leaves, or shrubs crowding the unit

can cause the unit to work harder and use more
energy.

 Keep shrubbery trimmed away from the unit and

periodically check for debris which collects around the
unit.

Cleaning of the outdoor unit's coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit.

Routine Maintenance

In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.

1. Air Filter — Ask your Lennox dealer to show you

where your indoor unit's filter is located. It will be either
at the indoor unit (installed internal or external to the
cabinet) or behind a return air grille in the wall or
ceiling. Check the filter monthly and clean or replace
it as needed.

2. Disposable Filter — Disposable filters should be

replaced with a filter of the same type and size.

NOTE - If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.

3. Reusable Filter — Many indoor units are equipped

with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.

NOTE - The filter and all access panels must be in place
any time the unit is in operation.

4. Indoor Unit — The indoor unit's evaporator coil is

equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)

Thermostat Operation

See the thermostat homeowner manual for instructions on
how to operate your thermostat.

Preservice Check

If your system fails to operate, check the following before
calling for service:

 Verify room thermostat settings are correct.
 Verify that all electrical disconnect switches are ON.
 Check for any blown fuses or tripped circuit breakers.
 Verify unit access panels are in place.
 Verify air filter is clean.
 If service is needed, locate and write down the unit

model number and have it handy before calling.

Accessories

For update-to-date information, see any of the following
publications:

 Lennox SSB*H4 Product Specification bulletin
 Lennox Product Catalog
 Lennox Price Book

Checklists

Use the following checklist to verify part‐load and full‐load
capacity operation of two‐stage modulation compressors.

TOOLS REQUIRED

 Refrigeration gauge set
 Digital volt/amp meter
 Electronic temperature thermometer
 On‐off toggle switch

IMPORTANT

This performance check is ONLY valid on systems that
have clean indoor and outdoor coils, proper airflow over
coils, and correct system refrigerant charge. 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).

Page 27

SSB*H4 SERIES

Two-Stage Modulation Compressors Field Operational Checklist

Unit Readings Y1 - First‐Stage

Expected results during Y2 demand

COMPRESSOR

Voltage Same

Amperage Higher

OUTDOOR UNIT FAN MOTOR

Amperage Same or Higher

TEMPERATURE

Ambient Same

Outdoor Coil Discharge Air Higher

Compressor Discharge Line Higher

Indoor Return Air Same

Indoor Coil Discharge Air Lower

PRESSURES

Suction (Vapor) Lower

Liquid Higher

(Toggle switch On)

Start-Up and Performance Checklist

Y2 - Second‐Stage

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Outdoor Fan

Maximum Fuse or Circuit Breaker

Electrical Connections Tight?  Indoor Filter clean?  Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Discharge Pressure Suction Pressure Refrigerant Charge Checked? 

Refrigerant Lines: Leak Checked?  Properly Insulated?  Outdoor Fan Checked? 

Service Valves: Fully Opened?  Caps Tight?  Thermostat

Voltage With Compressor Operating Calibrated?  Properly Set?  Level? 

507163-01 05/13

Page 28