Lennox HS27-024, HS27-042, HS27 Series, HS27-030, HS27-036 Installation Instructions Manual

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INSTALLATION

2000 Lennox Industries Inc.

Dallas, Texas, USA

HS27 Outdoor Unit

HS27 outdoor units are designed for expansion valve sys­tems only. They are not designed for RFC systems. Refer to
Lennox engineering handbook for expansion valve kits
which must be ordered separately.

Shipping & Packing List

1 − Assembled HS27 outdoor unit

2 − Grommets (for liquid and vapor lines)

1 − Bushing (for low voltage wiring)

Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.

WARNING

Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.

IMPORTANT

The Clean Air Act of 1990 bans the intentional vent­ing of refrigerant (CFC’s and HCFC’s) 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

HS27 SERIES UNITS

CONDENSING UNITS

504,669M
02/04

Supersedes 12/02

Table of Contents

HS27 Outdoor Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . . .

General Information 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Setting the Unit 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Refrigerant Piping 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Refrigerant Metering Device 9. . . . . . . . . . . . . . . . . . . . .

Manifold Gauge Set 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Valves 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evacuation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Operation 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 14. . . . . . . . . . . . . . . . . . . . . . . . . .

Start−up & Performance Check List 15. . . . . . . . . . . . . . .

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

General Information

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

WARNING

This product and/or the indoor unit it is matched with
may contain fiberglass wool.

Disturbing the insulation during installation, mainte­nance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber­glass wool is known to the State of California to
cause cancer.)

Fiberglass wool may also cause respiratory, skin,
and eye irritation.

To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.

Lennox Industries Inc.

P.O. Box 799900
Dallas, TX 75379−9900

Litho U.S.A.

02/04

*2P0204*

Page 1

504,669M

*P504669M*

Unit Dimensions − inches (mm)

HS27-024

HS27-036

airinlet

inlet

COMPRESSOR

air

2

(51)

3-7/8

(98)

32-1/8 (816)

7-1/2

(191)

4-7/8 (22)

28-1/8 (714)

HS27-024
HS27-030

HS27-036
HS27-042

7-1/2
(191)

electrical

3-7/8

(98)

(51)

inlets

vapor line

inlet

A

liquid

line inlet

4-1/2 (114)

B

2-3/4 (70)

2

1-3/8

(35)

DISCHARGE AIR

2-9/16

(65)

4

(102)

Top View

34-1/16 (865)

18-5/8

(473)

26-5/8 (676)

Side ViewAccess View

Model No. A B

in. 30-7/8 12-3/4

mm 784 324

in. 40-7/8 19-3/4

mm 1038 502

airinlet

4

(102)

6-1/16

(154)

Page 2

Parts Arrangement

outdoor fan
(not shown)

top of cabinet

run capacitor

ground lug

contactor

terminal box

high pressure

switch

Figure 1

Setting the Unit

CAUTION

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

CAUTION

Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.

Refer to unit dimensions for sizing mounting slab, platform­s, or supports. Refer to figure 2 for installation clearances.

vapor valve

and gauge port

liquid line

service valve

and gauge port

compressor

low pressure

switch

Installation Clearances

NOTE − A service access
clearance of 30" (762 mm)
must be maintained in front
of the service access panel.
Clearance to one side must
be 36" (914 mm). Clearance
to one of the remaining two
sides may be 12" (304 mm)
and the final side may be 6"
(152 mm).

NOTE − A clearance of 24" (610 mm)
must be maintained between two units.

NOTE − 48" (1219 mm) clearance required on top
of unit. Maximum soffit overhang is 36" (914 mm).

36"

(914 mm)

*36"

(914 mm)

*36"

(914 mm)

36"

(914 mm)

Figure 2

Page 3

A − Slab Mounting

When you install the unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground will not collect around the unit. See figure 3.
Slab should have a slope tolerance away from the building
of 2 degrees or 2 inches per 5 feet (51 mm per 1.5 m).

Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.

WARNING

2 degrees or

2 in. per 5 foot

(51 mm per 1.5 m)

slope tolerance away

from building structure

ground level

Slab Mounting

discharge air

building

structure

mounting

slab

Figure 3

B − Roof Mounting

Install unit at a minimum of 4 inches above surface of the roof.
Care must be taken to ensure weight of unit is properly distrib­uted over roof joists and rafters. Either redwood or steel sup­ports are recommended.

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).

Unit must be grounded in accordance with
national and local codes.
Electric Shock Hazard.
Can cause injury or death.

1. Install line voltage power supply to unit from a properly
sized disconnect switch.

2. Ground unit at unit disconnect switch or to an earth
ground.

NOTE − To facilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box us
ing a proper conduit fitting.

NOTE − Units are approved for use only with copper
conductors.

24V, Class II circuit connections are made in the low
voltage junction box. Refer to figure 4 for field wiring
diagram.

NOTE − A complete unit wiring diagram is located in
side the unit control box cover.

3. Install room thermostat (ordered separately) on an in­side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.

4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit. See figure 5.

Page 4

(LEADLESS)

Outdoor Unit

Field Wiring Diagram

YELLOW

Thermostat Designations

Thermostat Furnace

R

W1

Y

G

C

power

heat

cooling

indoor blower

common

R

W

Y

G

C

Figure 4

NOTE − see unit wiring diagram for

power supply connections.

Outdoor Unit

Y1 Outdoor Unit

C Outdoor Unit

NOTE − If the indoor unit is not equipped with blower relay, it must be field−provided and installed (P−8−3251 or equivalent).

Figure 5

Page 5