Carrier 48Ss Users Manual

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Product
Data

48SS
Single-Package
Gas Heating/Electric Cooling
Units
11⁄2 to 5 Nominal Tons

Single-Package Rooftop Products
with Energy-Saving Features
• direct spark ignition
• low sound levels
• 81% AFUE on most units
• 10 SEER

Features/Benefits
One-piece heating and
cooling units with low
installation costs, dependable performance, and easy
maintenance
Easy installation
Factory-assembled package is a
compact, fully self-contained, combination gas heating/electric cooling unit
that is prewired, prepiped, and
precharged for minimum installation
expense.
These 48SS units are available in a
variety of standard and optional
heating/cooling size combinations
with voltage options to meet residential and light commercial requirements. Units are lightweight and install
easily on a rooftop or a ground-level
pad.

Convertible duct
configuration
Unit is designed for easy use in either
downflow or horizontal applications.

Efficient operation
High-efficiency design with SEERs
(Seasonal Energy Efficiency Ratios)
of 10.0 and AFUE (Annual Fuel Utilization Efficiency) ratings as high as
81.0%. All units have a minimum
CSE (California Seasonal Efficiency)
rating of 76.5%.

Copyright 1998 Carrier Corporation

Form 48SS-4PD

Energy-saving, direct-spark ignition saves gas by operating only
when the room thermostat calls for
heating. Standard units are furnished
with natural gas controls. A lowcost, field-installed kit for propane
conversion is available for all units.
Monoport inshot burners produce
precise air-to-gas mixture which
provides for clean and efficient combustion. The large monoport on
the inshot (or injection type) burners
seldom, if ever, needs cleaning. All
gas furnace components are accessible
in one compartment.
The 48SS units meet California
Air Quality Management NOx
requirement of 40 nanograms/
joule or less when NOx kit
no. CRLOWNOX001A00 is
installed.

Durable, dependable
components
Top quality, top reliability components are designed and tested for a
minimum of 15 years of operation
under the harshest conditions. Every
48SS unit is thoroughly run-tested
at the factory in each operating mode,
and is evacuated prior to final
charging.
Compressors are designed for high
efficiency. Each compressor is hermetically sealed against contamination
to help promote longer life and dependable operation. Each compressor
also has vibration isolation to provide quiet operation. All compressors
have internal high-pressure and
overcurrent protection. Rotary compressors are standard on unit
size 018. Reciprocating compressors
are standard on unit sizes 024-042.
Scroll compressors are standard on
unit sizes 048 and 060.
Dimpled heat exchangers optimize
heat transfer for improved efficiency.
The tubular design permits hot gases
to stay in close contact with the cell
walls to maximize heat transfer and
efficiency.
The induced draft combustion
system eliminates the unsightly appearance of flue stacks, and diminishes
the effects of wind on heating operation. The induced draft also prevents contaminants from entering the
supply air if a leak in the heat exchanger occurs.

2

Direct-drive multispeed, PSC
(permanent split capacitor)
blower motor is standard on all
models.
Direct-drive, PSC condenser-fan
motor is designed to help reduce
energy consumption and provide for
cooling operation down to 40 F
outdoor temperature.
Refrigerant system is designed to
provide dependability. Liquid refrigerant strainers are used to promote
clean, unrestricted operation. Each
unit leaves the factory with a full refrigerant charge. Refrigerant service
connections make checking operating
pressures easier.
Color-coded wires permit easy tracing and diagnostics.
Evaporator and condenser coils
are computer-designed for optimum
heat transfer and cooling efficiency.
Condenser coil is fabricated of copper
tube and aluminum fins and is located inside the unit for protection
against damage for long life and reliable operation. The condenser coil
is internally mounted and protected by
a composite grille. Copper fin coils
are also available from the factory by
special order. These coils are recommended in applications where aluminum fins are likely to be damaged
due to corrosion and are ideal for seacoast applications.
Low sound ratings ensure a quiet
indoor and outdoor environment with
sound ratings as low as 7.4 bels.
Easy to service cabinets provide
easy accessibility to serviceable components during maintenance and
installation. Rounded corners are an
important safety feature, and a high
quality finish ensures an attractive
appearance.
Optional base rails provide holes
for rigging and forklifts as well as
an elevated mounting frame that provides structural support for horizontal installations. Ideal for light
commercial applications.
Downflow option unit is converted
for downflow at the factory to allow vertical ductwork connections.
Unit is equipped with base rail.

Low and high voltage electrical
entries allow low and high voltage to
be brought in through either the
front duct panel or rear flue panel.
Integrated gas unit controller
(IGC) contains all the ignition components and is easily accessible for service. The IGC provides built-in
diagnostic capabilities. A light-emitting
diode (LED) simplifies troubleshooting by providing visual fault notification and system status information.
The IGC board provides exclusive
anti-cycle protection for gas heat
operation. The IGC also contains
burner control logic for dependable
heating operation. The 48SS units
maximize heating efficiency through
the IGC’s control of evaporator fan
ON/OFF delays. The IGC helps make
48SS units reliable for years.
Weatherized cabinets are constructed of heavy-duty, phosphated,
zinc-coated prepainted steel capable
of withstanding 500 hours (Federal
Test Method Standard No. 141,
Method 6061) in salt spray. Interior
surfaces of the evaporator/heat
exchanger compartment are insulated
with cleanable, foil-faced insulation
for improved indoor-air quality. Unit
conforms to American Society of
Heating, Refrigeration and Air Conditioning Engineers [ASHRAE]
No. 62, with use of a sloped condensate pan. An external drain trap is
required.
The standard control system is
readily adaptable to all conventional
and programmable thermostats. In
addition, units are suitable for integration into monitor control systems if
required.
Standardized components for the
complete 48SS line of products are
found in all safety devices, condenserfan motors, evaporator-fan motors,
and control boards, while the gas sections use common inducer motors,
limit switches, and rollout switches.
This allows for greater inventory control, familiarity of parts, and fewer
stocked parts.

Table of contents
Page
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4,5
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,13
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-18
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Typical Control Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-23
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26,27

Model number nomenclature

3

ARI* capacities
COOLING CAPACITIES AND EFFICIENCIES
UNIT 48SS
018040
024040
024060
030040
030060
030080
036060
036080
036100
036120
042060
042080
042100
042120
048080
048100
048120
048140
060080
060100
060120
060140

Bels
db
SEER
wb

—
—
—
—

NOMINAL
TONS
11⁄2

STANDARD
CFM
600

NET COOLING†
CAPACITIES
17,000

SEER†
10.0

SOUND RATINGS**
(Bels)
7.4

2

800

24,000

10.0

7.6

21⁄2

1000

29,200

10.0

8.0

3

1200

36,000

10.0

8.0

31⁄2

1400

42,500

10.0

8.2

4

1600

47,000

10.0

8.2

5

1995

59,500

10.0

8.2

LEGEND
Sound Levels (1 bel = 10 decibels)
Dry Bulb
Seasonal Energy Efficiency Ratio
Wet Bulb

*Air Conditioning & Refrigeration Institute.
†Rated in accordance with U.S. Government DOE (Department of
Energy) test procedures and/or ARI Standard 210/240.
**Rated in accordance with ARI Standard 270.

NOTES:
1. Capacity ratings are net values, reflecting the effects of circulating
fan heat.
Ratings are based on:
Cooling Standard: 80 F db, 67 F wb indoor entering-air temperature and 95 F db outdoor entering-air temperature.
2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.

OUTDOOR SOUND: ONE-THIRD OCTAVE BAND DATA — DECIBELS
FREQUENCY (Hz)
63
125
250
500
1000
2000
4000
8000

018
49.8
56.5
60.3
59.8
64.1
64.1
65.2
56.0

024
38.1
55.0
65.3
67.2
68.9
65.5
63.8
60.3

Bels — Sound Levels (1 bel = 10 decibels)

4

030
45.7
58.1
68.7
64.7
73.0
70.2
68.8
66.6

UNIT 48SS
036
47.8
59.3
67.4
68.8
73.1
69.5
68.2
65.8

042
45.5
61.2
70.4
69.9
76.5
71.3
73.7
65.5

048
56.0
65.6
71.5
71.4
74.2
73.3
69.6
67.1

060
54.3
65.1
71.5
72.7
73.9
73.4
71.7
66.3

HEATING CAPACITIES AND EFFICIENCIES
UNIT 48SS
018040
024040
030040
024060
030060
036060
042060
030080
036080
042080
048080
060080
036100
042100
048100
060100
036120
042120
048120
060120
048140
060140

HEATING INPUT
(Btuh)

OUTPUT CAPACITY
(Btuh)

40,000

32,800

60,000

48,600

80,000

64,800

100,000

81,000

120,000

97,200

140,000

113,000

TEMPERATURE
RISE RANGE (°F)
20-50
20-50
20-50
25-55
25-55
25-55
25-55
40-70
40-70
40-70
40-70
40-70
50-80
50-80
50-80
50-80
60-90
60-90
60-90
60-90
50-80
50-80

AFUE (%)

CSE (%)

81
81
81
81
81
81
81
81
81
81
81
81
81
81
81
81
80
80
80
80
80
80

76.5
76.5
76.5
77.5
77.5
77.5
77.5
77.5
77.5
77.5
77.5
77.5
78.0
78.0
78.0
78.0
77.5
77.5
77.5
77.5
77.5
77.5

LEGEND
AFUE — Annual Fuel Utilization Efficiency
CSE — California Seasonal Efficiency
NOTE: Before purchasing this appliance, read important energy cost
and efficiency information available from your retailer.

5

Physical data
UNIT SIZE 48SS
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
COMPRESSORS
Quantity
REFRIGERANT (R-22)
Charge (lb)
REFRIGERANT METERING DEVICE
Orifice ID (in.)
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
EVAPORATOR FAN
Nominal Airflow (Cfm)
Size (in.)
FURNACE SECTION*
Burner Orifice No. (Qty...drill size)
Natural Gas
Burner Orifice No. (Qty...drill size)
Propane Gas
RETURN-AIR FILTERS (in.)†
Throwaway

UNIT SIZE 48SS
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
COMPRESSORS
Quantity
REFRIGERANT (R-22)
Charge (lb)
REFRIGERANT METERING
DEVICE
Orifice ID (in.)
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
EVAPORATOR FAN
Nominal Airflow (Cfm)
Size (in.)
FURNACE SECTION*
Burner Orifice No.
(Qty...drill size)
Natural Gas
Burner Orifice No.
(Qty...drill size)
Propane Gas
RETURN-AIR FILTERS (in.)†
Throwaway

042060
31⁄2

018040
11⁄2

024040
2

024060
2

030040
21⁄2

030060
21⁄2

272
296
Rotary
1

303
327

315
339

320
344

324
356

2.60

2.75

2.75

3.40

.030

.030

.030

.030

3.40
3.40
Acutrol™ Device
.030
.030

1...17
5.95

1...17
5.95

1...17
5.95

2...17
5.95

2...17
5.95

1700
18
⁄ (850)

18

1700
18
⁄ (850)

18

1700
18
⁄ (850)

1900
18
⁄ (850)

18

030080
21⁄2

2...17
5.95
1900
18
⁄ (850)

18

3...15
1.83

3...15
2.29

3...15
2.29

3...15
2.29

600
10 x 10

800
10 x 10

800
10 x 10

1000
10 x 10

1...32

1...32

2...40

1...32

2...40

1...41

1...41

2...47

1...41

20 x 20

20 x 20

20 x 20

20 x 24

042080
31⁄2

042100
31⁄2

036100
3

036120
3

336
360

348
372

348
372

4.30

4.30

4.30

4.30

.032

.032

.032

.032

2...17
5.95

2...17
5.95

2...17
5.95

2...17
5.95

1900
18
⁄ (1050)

18

14

3...15
3...15
2.29
2.29
Direct Drive
1000
1000
10 x 10
10 x 10

1900
18
⁄ (1050)

14

1900
18
⁄ (1050)

14

1900
18
⁄ (1050)

14

3...15
3.06

3...15
3.06

3...15
3.06

3...15
3.06

1200
10 x 10

1200
10 x 10

1200
10 x 10

1200
10 x 10

2...32

2...40

2...32

2...30

3...32

2...47

2...42

2...47

2...42

2...40

3...42

20 x 24

20 x 24

20 x 24

20 x 24

20 x 24

20 x 24

042120
31⁄2

048080
4

048100
4

048120
4

426
450

426
450

048140
4

060080
5

060100
5

060120
5

060140
5

426
453
450
477
Hermetic Scroll
1

465
489

465
489

465
489

375
399

375
387
399
411
Reciprocating
1

387
411

414
438

5.20

5.20

5.20

5.20

6.50

6.50
6.50
Acutrol™ Device

6.50

7.00

7.00

7.00

7.00

.034

.034

.034

.034

.030

.030

.030

.030

.030

.030

.030

.030

2...17
7.04

2...17
7.04

2...17
7.04

2...17
7.04

2...17
8.67

2...17
8.67

2...17
8.67

2...17
8.67

2...17
8.67

2...17
8.67

2...17
8.67

2...17
8.67

1900
18
⁄ (1050)

14

1900
18
⁄ (1050)

14

1900
18
⁄ (1050)

14

1900
18
⁄ (1050)

14

2400
20
⁄ (1050)

13

2400
20
⁄ (1050)

13

3...15
3.33

3...15
3.33

3...15
3.33

3...15
3.33

3...15
4.44

1400
10 x 10

1400
10 x 10

1400
10 x 10

1400
10 x 10

1600
10 x 10

2...40

2...32

2...30

3...32

2...32

2...30

2...47

2...42

2...40

3...42

2...42

24 x 24

24 x 24

24 x 24

24 x 24

24 x 30

2400
20
⁄ (1050)

13

3...15
3...15
4.44
4.44
Direct Drive
1600
1600
10 x 10
10 x 10

2400
20
⁄ (1050)

13

2400
20
⁄ (1050)

13

2400
20
⁄ (1050)

13

2400
20
⁄ (1050)

13

2400
20
⁄ (1050)

13

3...15
4.44

4...15
4.44

4...15
4.44

4...15
4.44

4...15
4.44

1600
10 x 10

1995
10 x 10

1995
10 x 10

1995
10 x 10

1995
10 x 10

3...32

3...31

2...32

2...30

3...32

3...31

2...40

3...42

3...40

2...42

2...40

3...42

3...40

24 x 30

24 x 30

816**

24 x 30

24 x 30

24 x 30

960**

*Based on altitude of 0-2000 feet.
†Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated
cooling airflow or the heating airflow at a velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity
type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
**Sq inch. Filter is mounted external to unit.

6

036080
3

324
336
356
360
Reciprocating
1

1900
18
⁄ (850)

18

036060
3

Options and accessories
Factory-installed options
Unit with base rail provides holes for rigging and forklifts
as well as an elevated mounting frame that gives additional
structural support for horizontal installations. Ideal for light
commercial applications.
Downflow option unit is shipped from factory configured
for vertical ductwork connection. Unit is equipped with
base rail.

UNIT WITH OPTIONAL BASE RAIL

Field-installed accessories
Factory-assembled roof curbs are designed for use on
downflow discharge applications. Heavy gage, galvanized
steel construction provides one-piece support. The curb complies with the standards of the NRCA (National Roofing
Contractors Association). A wood nailing strip is provided
for attaching the roofing to the curb.
25% Open manual outdoor-air damper provides for
minimum outdoor air and is manually adjustable.
Thermostat and subbase provide heating and cooling
unit control. The subbase provides system and fan switching at the thermostat location.
Carrier electronic programmable thermostats provide 2-stage heating and 2-stage cooling control with remote communication ability.
Low-ambient kit (Motormastert II device) allows the
use of mechanical cooling down to outdoor ambient temperatures as low as 0° F.
LP conversion kit allows for conversion from natural gas
to liquid propane. Conversion kit involves changing the gas
orifices and adding ceramic baffles to accommodate liquid
propane.
Solid-state Time Guardt II device protects compressor
by preventing short cycling.
Crankcase heater warms crankcase oil to reduce refrigerant migration and ensure proper compressor lubrication.
(Recommended on 208/230-v single-phase units in sizes
024-042 only).

High- and low-pressure switches provide additional
safety features and protect the unit from running at unsuitable pressures.
Filter rack features easy installation, serviceability, and high
filtering performance for vertical applications.
Lifting bracket kit provides attachment points for rigging
straps. The kit is not required when unit is equipped with
an optional base rail or downflow application.
High altitude kit is for use at 2001 to 5000 feet above
sea level. Kit consists of natural gas orifices that compensate for gas heat operation at high altitude.
Low NOx kit provides compliance with low NOx emissions
requirements for units being installed in California Air Quality Management Districts, which require NOx emissions of
40 nanograms/joule or less.

7

Base unit dimensions
48SS018-042 WITHOUT OPTIONAL BASE RAIL

REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel . . . . . . .
Unit top . . . . . . . . .
Side opposite ducts . . . .
Compressor access . . . .
(Except for NEC requirements)

. .
. .
. .
. .

. .
. .
. .
. .

. .
. .
. .
. .

. .
. .
. .
. .

. .
. .
. .
. .

. .
. .
. .
. .

. . .
. . 36
. . 36
. . 36

. .0
(914)
(914)
(914)

REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension
Unit top . . . . .
Duct side of unit .
Side opposite ducts
Bottom of unit . .
Flue panel . . . .

of
.
.
.
.
.

overhangs
. . . . .
. . . . .
. . . . .
. . . . .
. . . . .

. .
. .
. .
. .
. .
. .

. .
. .
. .
. .
. .
. .

. .
. .
. .
. .
. .
. .

. .
. .
. .
. .
. .
. .

. .
. .
. .
. .
. .
. .

. . 48 (1219)
. . 14 (356)
. . . 2 (51)
. . 14 (356)
. . . . .0
. . 36 (914)

NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side . . . . . . . . . . . . . 42 (1067)
Unit and ungrounded surfaces, control box side . . . . . . . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . . . . . . . . . . . . . 42 (1067)

UNIT

ELECTRICAL
CHARACTERISTICS

48SS180040
48SS024040
48SS024060
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120

208/230-1-60
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60

UNIT
48SS018040
48SS024040
48SS024060
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120

8

F
in./mm

G
in./mm

169⁄16/420.7

1815⁄16/481.0

209⁄16/522.3

2215⁄16/582.6

CENTER
X
25.07/637
27.07/688
26.98/685
26.71/678
27.15/689
27.50/698
27.40/696
27.01/686
26.94/684

UNIT WEIGHT
lb
272
303
315
320
324
336
348
375
387

kg
123
138
143
145
147
153
158
170
176

OF GRAVITY in./mm
Y
Z
20.59/523
23.35/593
23.27/591
10.85/276
23.46/596
22.36/568
22.48/571
22.44/570
22.44/570
12.7/321
22.44/570

A
81/37
97/44
100/45
100/45
94/43
86/39
89/40
95/43
98/45

CORNER WEIGHT
(lb/kg)
B
C
62/28
76/35
43/20
123/56
46/21
126/57
47/21
126/57
63/29
115/52
76/35
111/50
79/36
114/52
86/39
119/54
89/40
122/55

D
53/24
40/18
43/20
47/21
52/24
63/29
66/30
75/34
78/35

UNIT HEIGHT
(in./mm)
E
24.1/613
24.1/613
24.1/613
24.1/613
24.1/613
24.1/613
24.1/613
28.1/714
28.1/714

LEGEND
CG
— Center of Gravity
COND — Condenser
LV
— Low Voltage

MAT’L — Material
NEC
— National Electrical Code
REQ’D — Required

NOTES:
1. Clearances must be maintained to prevent recirculation of air
from outdoor-fan discharge.
2. Adequate clearance around air openings into combustion chamber must be provided.

48SS018-042 WITH OPTIONAL BASE RAIL

REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel . . . . . . . . .
Unit top . . . . . . . . . .
Side opposite ducts . . . . .
Compressor access . . . . .
(Except for NEC requirements)

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

. .
. 36
. 36
. 36

. .0
(914)
(914)
(914)

REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of
Unit top . . . . . .
Duct side of unit . . .
Side opposite ducts .
Bottom of unit . . . .
Flue panel . . . . .

overhangs . . . . . . . . . . . 48 (1219)
. . . . . . . . . . . . . . . . 14 (356)
. . . . . . . . . . . . . . . . . 2 (51)
. . . . . . . . . . . . . . . . 14 (356)
. . . . . . . . . . . . . . . . . . .0
. . . . . . . . . . . . . . . . 36 (914)

NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side . . . . . . . . . . . . 42 (1067)
Unit and ungrounded surfaces, control box side . . . . . . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . . . . . . . . . . . . 42 (1067)

UNIT

ELECTRICAL
CHARACTERISTICS

48SS018040
48SS024040
48SS024060
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120

208/230-1-60
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60

UNIT
48SS018040
48SS024040
48SS024060
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120

F
in./mm

197⁄8/504.8

237⁄8/606.4

G
in./mm

221⁄4/565.4

261⁄4/666.8

UNIT WEIGHT
lb
296
327
339
344
356
360
372
399
411

kg
135
149
155
157
162
164
169
181
187

CENTER OF GRAVITY in./mm
X
Y
Z
25.04/636
22.72/577
26.90/683.3 20.17/512.3
26.82/681.2 20.22/513.6
26.57/674.9 20.1/ 509.3
13.16/334.3
26.93/684
21.1/535.4
27.31/693.7 21.0/532.6
27.23/691.6 21.0/533.1
26.87/682.5 21.0/533.1
14.96/380
26.81/681
21.0/533.7

A
87/40
103/47
106/48
106/48
102/46
92/42
95/43
101/46
104/47

CORNER WEIGHT
(lb/kg)
B
C
68/31
82/37
49/22
129/59
52/24
132/60
53/24
132/60
71/32
123/56
82/37
117/53
85/39
120/55
92/42
125/57
95/43
128/58

D
59/27
46/21
49/22
53/24
60/27
69/31
72/33
81/37
84/38

UNIT HEIGHT
(in./mm)
E
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
31.4/798
31.4/798

LEGEND
CG
— Center of Gravity
COND — Condenser
LV
— Low Voltage

MAT’L — Material
NEC
— National Electrical Code
REQ’D — Required

NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Adequate clearance around air openings into combustion chamber
must be provided.

9

Base unit dimensions (cont)
48SS048,060 WITHOUT OPTIONAL BASE RAIL

REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel . . . . . . . . .
Unit top . . . . . . . . . . .
Side opposite ducts . . . . .
Compressor access . . . . .
(Except for NEC requirements)

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

. .
. 36
. 36
. 36

. .0
(914)
(914)
(914)

REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs
Unit top . . . . . . . . . . . .
Duct side of unit . . . . . . . .
Side opposite ducts . . . . . .
Bottom of unit . . . . . . . . .
Flue panel . . . . . . . . . .

. . . . . . . . . 48 (1219)
. . . . . . . . . . 14 (356)
. . . . . . . . . . . 2 (51)
. . . . . . . . . . 14 (356)
. . . . . . . . . . . . .0
. . . . . . . . . . 36 (914)

NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side . . . . . . . . . . 42 (1067)
Unit and ungrounded surfaces, control box side . . . . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . . . . . . . . . . . 42 (1067)

UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140

UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140

10

ELECTRICAL
CHARACTERISTICS
208/230-1-60,
208/230-1-60,
208/230-1-60,
208/230-1-60,

208/230-3-60,
208/230-3-60,
208/230-3-60,
208/230-3-60,

460-3-60
460-3-60
460-3-60
460-3-60

UNIT WEIGHT
lb
414
426
453
465

CENTER OF GRAVITY (in./mm)
X
Y
Z
28.76/731
23.46/596
15.35/390
28.42/722
23.42/595
15.35/390
28.36/720
23.27/591
15.35/390
27.95/710
23.23/590
15.35/390

kg
188
193
206
211

A
107/49
110/50
117/53
120/55

CORNER WEIGHT
(lb/kg)
B
C
83/38
158/72
86/39
159/72
93/42
167/76
96/44
167/76

D
66/30
71/32
76/35
82/37

LEGEND
CG
— Center of Gravity
COND — Condenser
LV
— Low Voltage

MAT’L — Material
NEC
— National Electrical Code
REQ’D — Required

NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.

48SS048,060 WITH OPTIONAL BASE RAIL

REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel . . . . . . . . .
Unit top . . . . . . . . . .
Side opposite ducts . . . . .
Compressor access . . . . .
(Except for NEC requirements)

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

.
.
.
.

. .
. 36
. 36
. 36

. .0
(914)
(914)
(914)

REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of
Unit top . . . . . .
Duct side of unit . . .
Side opposite ducts .
Bottom of unit . . . .
Flue panel . . . . .

overhangs . . . . . . . . . . . 48 (1219)
. . . . . . . . . . . . . . . . 14 (356)
. . . . . . . . . . . . . . . . . 2 (51)
. . . . . . . . . . . . . . . . 14 (356)
. . . . . . . . . . . . . . . . . . .0
. . . . . . . . . . . . . . . . 36 (914)

NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side . . . . . . . . . . . . 42 (1067)
Unit and ungrounded surfaces, control box side . . . . . . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . . . . . . . . . . . . 42 (1067)

UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140

UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140

ELECTRICAL
CHARACTERISTICS
208/230-1-60,
208/230-1-60,
208/230-1-60,
208/230-1-60,

208/230-3-60,
208/230-3-60,
208/230-3-60,
208/230-3-60,

460-3-60
460-3-60
460-3-60
460-3-60

UNIT WEIGHT
lb
kg
438
199
450
205
477
217
489
222

CENTER OF GRAVITY (in./mm)
X
Y
Z
28.54/724.9
20.00/508
17.66/448.6
28.22/716.8
20.05/509.3
17.66/448.6
28.18/715.6
20.19/512.8
17.66/448.6
27.79/705.9
20.23/513.8
17.66/448.6

A
113/51
116/53
123/56
126/57

CORNER WEIGHT (lb/kg)
B
C
89/40
164/75
92/42
165/75
99/45
173/79
102/46
173/79

D
72/33
77/35
82/37
88/40

LEGEND
CG
— Center of Gravity
MAT’L — Material
COND — Condenser
NEC
— National Electrical Code
LV
— Low Voltage
REQ’D — Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Adequate clearance around air openings into combustion chamber
must be provided.

11

Accessory dimensions
ROOF CURB DIMENSIONS

48SS

PART NUMBER
CPRFCURB001A00
CPRFCURB002A00
CPRFCURB003A00

‘‘A’’
89 [203]
119 [279]
149 [356]

NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied as required for unit being installed.
3. Dimensions in [ ] are in millimeters.
4. Roof curb is made of 16 gage steel.
5. Attach ductwork to curb (flanges of duct rest on curb).
6. Service clearance 4 ft on each side.
7.
Direction of airflow.
8. Insulated panels: 1-in. thick fiberglass 1 lb density.

12

MANUAL OUTDOOR AIR DAMPER

FILTER RACKS AND FILTERS

ACCESSORY
FILTER
RACK

PART NUMBER
CPFILTRK001A00
CPFILTRK002A00
CPFILTRK003A00

‘‘A’’
2111⁄169
3111⁄169
2511⁄169

Selection procedure (with example)
I Determine cooling and heating requirements at
design conditions:
Given:
Required Cooling Capacity (TC) . . . . . . 34,000 Btuh
Sensible Heat Capacity (SHC) . . . . . . . 24,000 Btuh
Required Heating Capacity . . . . . . . . . . 60,000 Btuh
Condenser Entering-Air Temperature . . . . . . . . 95 F
Indoor-Air Temperature . . . . . . . 80 F edb, 67 F ewb
Evaporator-Air Quantity . . . . . . . . . . . . . . . 1200 cfm
External Static Pressure . . . . . . . . . . . . . . . 0.2 in. wg
Electrical Characteristics (V-Ph-Hz) . . . . . . . 208-1-60
II Select unit based on required cooling capacity.
Enter Cooling Capacities table at condenser entering
temperature of 95 F. Unit 48SS036 at 1200 cfm and
67 F ewb (entering wet bulb) will provide a total capacity of 36,000 Btuh and an SHC of 26,200 Btuh.
Calculate SHC correction, if required, using Note 4
under Cooling Capacities tables.
III Select heating capacity of unit to provide design
condition requirement.
In the Heating Capacities and Efficiencies table on
page 5, note that unit 48SS036080 will provide
64,800 Btuh with an input of 80,000 Btuh.

IV Determine fan speed and power requirements
at design conditions.
Before entering the air delivery tables, calculate the
total static pressure required. From the given, the Wet
Coil Pressure Drop table, and the Filter Pressure Drop
table on page 18, find at 1200 cfm:
External static pressure
0.20 in. wg
Wet coil
0.088 in. wg
Filter
0.13 in. wg
Total static pressure
0.42 in. wg (rounded)
Enter the table for Dry Coil Air Delivery — Horizontal
Discharge for 230 and 460 V on page 16. For 208 v
operation, deduct 10% from value given. The fan will
deliver 1233 cfm at 0.4 external static pressure (1370
x 0.9) at high speed and 852 cfm at 0.5 external static
pressure (946 x 0.9) at low speed. The fan speed should
be set at high to satisfy job requirements.
V Select unit that corresponds to power source
available.
The Electrical Data table on page 24 shows that the
unit is designed to operate at 208-1-60.

13

Performance data
COOLING CAPACITIES
48SS018
TEMP (F)
AIR ENT
COND

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

48SS036
EVAP AIR — CFM/BF
525/0.10
600/0.12
675/0.13
Evap Air — Ewb (F)
62
67
72
62
67
72
62
67
72
15.8 17.4 19.0 16.0 17.6 19.2 16.1 17.8 19.3
13.6 11.2 8.7 14.4 11.8 9.0 15.1 12.4 9.2
1.76 1.80 1.85 1.81 1.86 1.90 1.86 1.91 1.95
15.3 16.9 18.5 15.5 17.0 18.7 15.6 17.1 18.8
13.4 11.1 8.6 14.2 11.6 8.9 14.9 12.2 9.1
1.90 1.95 2.00 1.95 2.00 2.05 2.01 2.05 2.10
14.6 16.2 17.9 14.9 16.3 18.0 14.9 16.4 18.0
13.2 10.9 8.4 14.0 11.4 8.6 14.6 12.0 8.8
2.05 2.10 2.15 2.10 2.15 2.20 2.15 2.20 2.25
13.8 15.5 17.1 14.1 15.6 17.3 14.3 15.7 17.4
12.8 10.6 8.1 13.6 11.2 8.4 14.2 11.7 8.7
2.20 2.26 2.31 2.25 2.31 2.37 2.31 2.36 2.42

48SS024
TEMP (F)
AIR ENT
COND

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

TC
85 SHC
kW
TC
95 SHC
kW
TC
105 SHC
kW
TC
115 SHC
kW

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

EVAP AIR — CFM/BF
1200/0.08
1350/0.09
Evap Air — Ewb (F)
72
62
67
72
62
67
72
41.7 34.2 38.3 42.3 34.8 38.7 42.6
19.9 32.5 27.1 20.7 34.2 28.5 21.4
3.99 3.81 3.95 4.08 3.90 4.03 4.15
39.3 31.9 36.0 40.2 32.8 36.4 40.4
19.1 31.4 26.2 20.1 32.8 27.7 20.8
4.18 3.99 4.14 4.29 4.09 4.22 4.36
37.2 30.0 33.7 37.6 31.1 34.0 37.9
18.4 30.0 25.4 19.2 31.0 26.8 20.0
4.39 4.17 4.32 4.48 4.29 4.41 4.56
34.7 28.1 31.3 35.0 29.2 31.6 35.2
17.5 28.1 24.5 18.3 29.2 25.9 19.0
4.57 4.37 4.50 4.66 4.48 4.58 4.73

1050/0.07
62
33.6
30.5
3.72
31.2
29.4
3.90
28.8
28.2
4.08
26.7
26.7
4.26

67
37.6
25.4
3.86
35.5
24.7
4.05
33.2
23.8
4.23
30.9
22.9
4.41

48SS042
EVAP AIR — CFM/BF
700/0.06
800/0.07
900/0.08
Evap Air — Ewb (F)
62
67
72
62
67
72
62
67
72
22.5 25.1 27.8 23.0 25.6 28.3 23.4 26.0 28.7
19.8 16.6 13.2 21.2 17.6 13.7 22.3 18.6 14.2
2.51 2.60 2.69 2.56 2.65 2.75 2.62 2.71 2.80
21.1 23.6 26.3 21.5 24.0 26.6 21.9 24.4 27.0
19.3 16.1 12.7 20.5 17.1 13.1 21.5 18.1 13.7
2.63 2.73 2.84 2.69 2.82 2.89 2.75 2.85 2.95
19.6 22.0 24.6 20.0 22.4 25.0 20.5 22.6 25.3
18.5 15.5 12.1 19.7 16.5 12.7 20.5 17.4 13.2
2.74 2.86 2.97 2.81 2.92 3.03 2.88 2.97 3.09
17.9 20.3 22.9 18.6 20.6 23.2 19.2 20.9 23.5
17.6 14.9 11.6 18.5 15.9 12.2 19.2 16.9 12.7
2.85 2.97 3.10 2.93 3.03 3.16 3.01 3.09 3.21

48SS030
TEMP (F)
AIR ENT
COND

TEMP (F)
AIR ENT
COND

EVAP AIR — CFM/BF
875/0.08
1000/0.09
1125/0.10
Evap Air — Ewb (F)
62
67
72
62
67
72
62
67
72
27.5 30.7 33.7 28.0 31.1 34.0 28.4 31.3 34.5
25.2 21.0 16.3 26.8 22.3 16.9 28.2 23.4 17.6
3.01 3.09 3.16 3.07 3.15 3.22 3.13 3.20 3.28
25.8 28.8 31.7 26.3 29.2 32.3 26.9 29.4 32.4
24.4 20.4 15.6 25.9 21.6 16.4 26.9 22.7 16.9
3.16 3.25 3.33 3.23 3.32 3.40 3.30 3.37 3.44
23.9 26.9 29.9 24.6 27.2 30.1 25.3 27.5 30.5
23.4 19.6 15.0 24.6 20.9 15.6 25.3 22.1 16.4
3.30 3.40 3.49 3.38 3.46 3.54 3.45 3.52 3.61
21.9 24.8 27.6 22.9 25.0 28.0 23.6 25.2 28.1
21.9 18.8 14.2 22.9 20.1 15.0 23.6 21.2 15.6
3.44 3.53 3.62 3.52 3.59 3.89 3.59 3.64 3.74

TEMP (F)
AIR ENT
COND

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

EVAP AIR — CFM/BF
1400/0.12
1575/0.14
Evap Air — Ewb (F)
72
62
67
72
62
67
72
47.9 41.1 44.9 48.5 41.8 45.4 49.0
23.5 38.3 31.7 24.3 40.2 33.2 25.0
4.57 4.38 4.52 4.66 4.48 4.61 4.75
45.3 38.8 42.5 45.9 39.4 43.0 46.4
22.5 37.1 30.9 23.4 38.9 32.5 24.2
4.81 4.61 4.77 4.91 4.71 4.87 5.00
43.0 36.4 39.9 43.3 37.2 40.4 43.7
21.8 35.8 29.9 22.5 37.2 31.5 23.4
5.08 4.84 5.01 5.17 4.94 5.10 5.26
40.1 34.1 37.2 40.4 35.0 37.6 40.8
20.7 34.1 28.8 21.4 35.0 30.4 22.3
5.30 5.06 5.23 5.39 5.18 5.32 5.49

1225/0.11
62
40.3
36.1
4.28
38.0
34.9
4.50
35.7
33.8
4.73
33.3
32.5
4.94

67
44.2
30.0
4.43
41.8
29.2
4.67
39.3
28.2
4.90
36.7
27.2
5.12

LEGEND
BF
— Bypass Factor
edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
ldb — Leaving Dry-Bulb
lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity, 1000 Btuh
TC
— Total Cooling Capacity, 1000 Btuh (net)
NOTES:
1. Ratings are net; they account for the effects of the indoor-fan motor
power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
sensible capacity (Btuh)
tldb = t edb –
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h lwb)
hlwb = hewb –

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering indoor coil
4. The SHC is based on 80 F edb temperature of air entering indoor
coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

14

COOLING CAPACITIES (cont)
48SS048
TEMP (F)
AIR ENT
COND

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

EVAP AIR — CFM/BF
1600/0.10
1800/0.11
Evap Air — Ewb (F)
72
62
67
72
62
67
72
52.9 44.5 49.1 53.7 45.1 49.6 53.9
25.6 41.9 34.6 26.4 44.1 36.4 27.1
4.95 4.87 4.97 5.07 4.99 5.08 5.17
50.9 42.6 47.0 51.7 43.3 47.5 52.2
24.8 41.1 33.9 25.9 43.1 35.9 26.8
5.38 5.29 5.40 5.50 5.41 5.51 5.61
48.8 40.1 44.7 49.2 41.2 45.2 49.6
24.1 39.7 33.1 25.1 41.2 35.1 26.0
5.83 5.74 5.85 5.95 5.87 5.96 6.06
46.4 37.7 42.4 47.0 39.0 42.8 47.4
23.4 37.6 32.4 24.3 39.0 34.2 25.4
6.34 6.22 6.34 6.45 6.36 6.46 6.57

1400/0.08
62
43.8
39.4
4.76
41.9
38.6
5.17
39.3
37.3
5.61
36.6
35.9
6.08

67
48.3
32.7
4.85
46.4
32.1
5.28
44.2
31.2
5.73
41.5
30.2
6.22

LEGEND
BF
— Bypass Factor
edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
ldb — Leaving Dry-Bulb
lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity, 1000 Btuh
TC
— Total Cooling Capacity, 1000 Btuh (net)
NOTES:
1. Ratings are net; they account for the effects of the indoor-fan motor
power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
tldb = t edb – sensible capacity (Btuh)
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h lwb)
hlwb = hewb –

48SS060
TEMP (F)
AIR ENT
COND

85
95
105
115

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

EVAP AIR — CFM/BF
2000/0.04
2250/0.05
Evap Air — Ewb (F)
72
62
67
72
62
67
72
69.4 56.3 63.1 70.5 58.2 63.9 71.3
34.2 56.1 46.7 35.8 58.1 49.5 37.4
6.53 6.32 6.50 6.70 6.52 6.67 6.88
66.2 53.6 59.6 67.3 55.6 60.2 68.1
33.2 53.5 45.3 34.8 55.6 48.2 36.3
7.05 6.83 7.00 7.22 7.03 7.17 7.39
62.9 51.0 56.0 63.9 53.0 56.7 64.5
32.1 50.9 44.0 33.7 52.8 46.9 35.3
7.60 7.39 7.54 7.78 7.59 7.71 7.95
59.5 48.5 52.8 60.5 50.4 53.4 60.8
30.9 48.4 42.8 32.6 50.3 45.6 34.1
8.19 7.98 8.12 8.36 8.18 8.29 8.43

1750/0.03
62
55.0
52.4
6.14
51.8
51.0
6.62
48.7
48.7
7.17
45.8
45.8
7.77

67
62.0
43.7
6.33
58.8
42.4
6.82
55.1
41.1
7.37
52.0
40.0
7.94

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering indoor coil
4. The SHC is based on 80 F edb temperature of air entering indoor
coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

15

Performance data (cont)
DRY COIL AIR DELIVERY* — HORIZONTAL DISCHARGE
(Deduct 10% for 208 v)
UNIT
SIZE
48SS

MOTOR
SPEED
Low

018
High
Low
024,
030

Med
High
Low

036

Med
High
Low

042
High
Low
048
High
Low
060

Med
High

Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm

0.0
230
760
—
—
275
857
371
1079
514
1409
473
1253
519
1414
667
1734
678
1540
—
—
—
—
—
—
1104
1876
1351
2249
—
—

0.1
225
745
—
—
275
835
368
1063
493
1383
447
1253
500
1366
634
1639
635
1515
820
1825
—
—
—
—
1093
1865
1295
2209
—
—

0.2
220
725
—
—
273
802
360
1027
476
1324
427
1172
478
1287
609
1563
604
1475
785
1750
854
2026
—
—
1072
1840
1245
2157
1391
2299

230 AND 460 VOLT HORIZONTAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
210
195
170
—
—
695
640
540
—
—
—
270
235
200
—
—
850
700
450
—
269
260
257
249
—
782
745
717
663
—
349
345
326
319
304
996
978
919
865
783
460
443
425
401
378
1282
1223
1156
1068
984
418
395
367
346
337
1130
1047
946
865
829
459
439
410
377
357
1234
1162
1074
920
829
593
564
541
506
469
1461
1370
1292
1157
960
580
550
520
493
455
1430
1375
1280
1225
1128
750
700
680
649
612
1685
1610
1525
1485
1335
786
744
706
641
606
1905
1830
1752
1603
1513
905
846
824
804
748
2025
1905
1830
1752
1603
1029
986
938
891
830
1803
1765
1710
1641
1533
1197
1148
1096
1053
994
2097
2036
1959
1882
1781
1343
1296
1247
1191
1129
2231
2152
2060
1975
1859

*Air delivery values are based on operating voltage of 230 v or 460 v, dry coil, without filter.
Deduct wet coil and filter pressure drops to obtain external static pressure available for ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of
rated cooling capacity. Evaporator coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not
recommended.

16

0.8
—
—
—
—
—
—
293
726
344
857
323
768
340
743
436
829
430
1020
570
1215
557
1367
683
1398
769
1425
936
1679
1067
1746

0.9
—
—
—
—
—
—
—
—
—
—
—
—
—
—
422
743
—
—
—
—
511
1228
637
1228
733
1345
871
1542
1002
1591

1.0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
697
1264
812
1405
936
1441

DRY COIL AIR DELIVERY* — VERTICAL DISCHARGE
(Deduct 10% for 208 v)
UNIT
SIZE
48SS

MOTOR
SPEED
Low

018
High
Low
024,
030

Med
High
Low

036

Med
High
Low

042
High
Low
048
High
Low
060

Med
High

Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm

0.0
—
—
401
1334
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

0.1
295
821
376
1253
285
798
378
1011
520
1342
460
1191
511
1316
655
1541
637
1500
790
1750
847
1995
—
—
983
1838
1115
2067
1284
2187

0.2
251
817
346
1128
284
761
371
982
511
1289
439
1136
492
1244
631
1458
612
1450
750
1625
784
1901
909
2018
960
1808
1083
2023
1201
2108

230 AND 460 VOLT VERTICAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
223
201
176
149
124
753
665
536
343
164
322
294
272
250
229
996
816
658
461
246
282
278
274
270
261
727
682
634
581
525
368
362
357
343
332
948
906
858
771
703
487
472
451
431
411
1237
1181
1106
1007
892
423
898
379
349
322
1081
1005
907
795
687
470
450
420
392
364
1178
1104
1005
891
784
603
584
552
522
492
1367
1292
1178
1053
920
587
560
536
493
455
1405
1350
1290
1200
1105
700
699
639
608
574
1604
1509
1421
1323
1221
746
708
646
609
563
1822
1730
1580
1477
1319
852
820
801
751
687
1896
1814
1729
1582
1380
923
885
845
804
751
1755
1702
1628
1553
1446
1045
1006
964
921
872
1957
1891
1807
1723
1612
1166
1131
1092
1053
1001
2038
1968
1882
1796
1676

0.8
—
—
219
167
251
450
315
597
385
745
297
579
332
657
459
806
—
—
547
1094
516
1178
639
1220
697
1339
823
1501
950
1555

0.9
—
—
—
—
244
371
301
492
362
610
270
471
308
535
433
662
—
—
—
—
—
—
—
—
665
1257
783
1392
907
1437

1.0
—
—
—
—
230
304
283
387
341
471
246
349
275
389
398
509
—
—
—
—
—
—
—
—
633
1175
742
1282
864
1318

*Air delivery values are based on operating voltage of 230 v or 460 v, dry coil, without filter.
Deduct wet coil and filter pressure drops to obtain external static pressure available for ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of
rated cooling capacity. Evaporator coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not
recommended.

17

Performance data (cont)
WET COIL PRESSURE DROP
UNIT SIZE

018

024

030

036

042

048

060

AIRFLOW
(cfm)
600
700
800
900
600
700
800
900
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1900
2100
2300

PRESSURE DROP
(in. wg)
0.069
0.082
0.102
0.116
0.039
0.058
0.075
0.088
0.088
0.095
0.123
0.068
0.088
0.108
0.123
0.048
0.069
0.088
0.102
0.068
0.075
0.088
0.082
0.095
0.108
0.123

FILTER PRESSURE DROP (in. wg)
CFM
FILTER
UNIT SIZE SIZE
(in.) 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
018, 024
20 x 20 0.05 0.07 0.08 0.10 0.12 0.13 —
—
—
—
—
—
—
—
—
—
—
—
—
030, 036
20 x 24
—
—
—
— 0.09 0.10 0.11 0.13 0.14 0.15 0.16
—
—
—
—
—
—
—
—
042
24 x 24
—
—
—
—
—
—
—
—
0.11 0.12 0.14 0.15
—
—
—
—
—
—
—
048, 060
24 x 30
—
—
—
—
—
—
—
—
—
0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18

18

Typical piping and wiring
HORIZONTAL DISCHARGE

Power Wiring
Control Wiring
Outdoor Airflow
Indoor Airflow
NEC — National Electrical Code

DOWNFLOW DISCHARGE

ROOF-MOUNTING
CURB
ROOF

RETURN-AIR
FLEXIBLE DUCT
SUPPLY-AIR
FLEXIBLE DUCT

CEILING

19

Application data
Condensate trap — A 2-in. condensate trap must be field
supplied.
Ductwork — Secure downflow discharge ductwork to roof
curb. For horizontal discharge applications, attach ductwork to unit with flanges.
To convert a unit to downflow discharge or horizontal discharge — Units are equipped with factory-installed
duct covers on both the downflow and horizontal openings.
Remove appropriate duct panel covers for intended discharge application. Units with downflow option do not require duct panel cover removal.

20

Airflow — Units are draw-thru on cooling and blow-thru
on heating.
Maximum cooling airflow — To minimize the possibility
of condensate blow-off from evaporator, airflow through units
should not exceed 450 cfm/ton.
Minimum cooling airflow is 350 cfm/ton.
Minimum ambient operating temperature in cooling
for all standard units is 40 F. With accessory low ambient
temperature kit, units can operate at temperatures down to
0° F.

Typical control wiring schematic,
48SS018-060; 208/230-1-60

LEGEND
AWG
BR
C
CAP
CH
COMP
CR
EQUIP
FL
FS
FU
GND
GVR
HS
HV TRAN
I
IDM
IFM
IGC
IP
LS
MGV
NEC

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

American Wire Gage
Blower Relay
Contactor
Capacitor
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Fuse Link
Flame Sensor
Fuse
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Internal Protector
Limit Switch
Main Gas Valve
National Electrical Code

OFM
PWR
QT
RS
TRAN

—
—
—
—
—

Outdoor-Fan Motor
Power
Quadruple Terminal
Rollout Switch
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring

NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced
with type 90 C wire or its equivalent.
2. Use copper conductors only.

21

Typical control wiring schematic,
48SS030-060; 208/230-3-60

LEGEND
AWG
BR
C
CAP
CH
COMP
CR
EQUIP
FL
FS
FU
GND
GVR
HS
HV TRAN
I
IDM
IFM
IGC
IP
LS
MGV
NEC

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

American Wire Gage
Blower Relay
Contactor
Capacitor
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Fuse Link
Flame Sensor
Fuse
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Internal Protector
Limit Switch
Main Gas Valve
National Electrical Code

OFM
PWR
QT
RS
TRAN

—
—
—
—
—

Outdoor-Fan Motor
Power
Quadruple Terminal
Rollout Switch
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring

NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced
with type 90 C wire or its equivalent.
2. Use copper conductors only.

22

Typical control wiring schematic,
48SS036-060; 460-3-60

LEGEND
AWG
BR
C
CAP
CH
COMP
CR
EQUIP
FS
FU
GND
GVR
HS
HV TRAN
I
IDM
IFM
IGC
LS
MGV
NEC
OFM

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

American Wire Gage
Blower Relay
Contactor
Capacitor
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Flame Sensor
Fuse
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor

PWR
QT
RS
TRAN

—
—
—
—

Power
Quadruple Terminal
Rollout Switch
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring

NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced
with type 90 C wire or its equivalent.
2. Use copper conductors only.

23

Electrical data
UNIT
48SS

V-PH-HZ

018
024

208/230-1-60
208/230-1-60
208/230-1-60
208/230-3-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
460-3-60

030

036

042

048

060

VOLTAGE
RANGE
Min
187
187
187
187
187
187
414
187
187
414
187
187
414
187
187
414

Max
253
253
253
253
253
253
506
253
253
506
253
253
506
253
253
506

COMPRESSOR
RLA
7.6
12.4
14.4
9.4
18.0
11.7
5.6
20.4
14.0
6.4
26.4
15.0
8.2
32.1
19.3
10.0

LRA
45
61
82
66
96
75
40
104
91
42
129
99
50
169
123
62

COND
FAN
MOTOR
FLA
0.7
0.7
1.4
1.4
1.4
1.4
0.8
1.4
1.4
0.8
2.1
2.1
1.1
2.1
2.1
1.1

LEGEND
American Wire Gage
CanadianStandards Association
Full Load Amps
Heating, Air Conditioning and
Refrigeration
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
(fuses or HACR-type circuit breaker)
NEC
— National Electrical Code
RLA
— Rated Load Amps
*Fuse or HACR breaker.
†Minimum wire size is based on 60 C copper wire. If other than 60 C if
used, determine size from NEC. Voltage drop of wire must be less than
2% of rated voltage.
AWG
CSA
FLA
HACR

—
—
—
—

NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker.
The CSA units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage

24

INDOOR
FAN
FLA
1.8
2.0
2.0
2.0
2.8
2.8
1.4
4.0
4.0
2.0
5.0
5.0
2.3
6.8
6.8
3.2

POWER SUPPLY
MCA
12.0
18.2
21.8
15.5
26.7
18.8
9.2
30.9
22.9
10.8
40.1
25.9
13.7
49.0
33.0
16.8

MOCP*
15
30
30
25
40
30
10
50
35
15
60
40
20
60
50
25

AWG 60 C
MIN WIRE
SIZE†

MAX WIRE
LENGTH
(ft)

14
12
10
12
10
12
14
8
10
14
6
10
14
6
8
12

75
80
100
80
90
65
100
100
85
100
100
75
100
100
90
100

EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.

Controls
Sequence of operation
Heating — On a call for heating, terminal ‘‘W’’ of the thermostat is energized, starting the induced-draft motor. When
the hall-effect sensor on the induced-draft motor senses that
it has reached the required speed, the burner sequence begins. This function is performed by the integrated control
board (IGC). The indoor-fan motor is energized 45 seconds
after flame is established. When the thermostat is satisfied
and ‘‘W’’ is deenergized, the indoor-fan motor stops after a
45-second time-off delay.
Cooling — With the room thermostat SYSTEM switch in
the COOL position and the FAN switch in the AUTO. position, the cooling sequence of operation is as follows:
When the room temperature rises to a point that is slightly
above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal
R to terminals Y and G. These completed circuits through
the thermostat connect contactor coil (C) (through unit wire
Y) and blower relay coil (BR) (through unit wire G) across
the 24-v secondary of transformer (TRAN).

The normally-open contacts of energized contactor (C)
close and complete the circuit through compressor motor
(COMP) and condenser (outdoor) fan motor (OFM). Both
motors start instantly.
The set of normally-open contacts of energized relay BR
close and complete the circuit through evaporator blower
(indoor) fan motor (IFM). The blower motor starts
instantly.
The cooling cycle remains ‘‘on’’ until the room temperature drops to point that is slightly below the cooling
control setting of the room thermostat. At this point, the
thermostat ‘‘breaks’’ the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize
contactor coil C and relay coil BR. The condenser and compressor motors stop. After a 30-second delay, the blower
motor stops. The unit is in a ‘‘standby’’ condition, waiting
for the next ‘‘call for cooling’’ from the room thermostat.

25

Guide specifications
Packaged Heating/Cooling Units
Constant Volume Application
HVAC Guide Specifications

C.

Size Range: 11⁄2 to 5 Tons, Nominal Cooling
40,000 to 140,000 Btuh,
Nominal Input Heating
Carrier Model Number: 48SS
Part 1 — General
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit utilizing a rotary, reciprocating, or scroll hermetic compressor for cooling duty. Unit shall discharge
supply air downward or horizontally as shown on contract drawings. Outdoor fan/coil section shall have a
blow-thru design for minimum sound levels.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards
210/240 and 270.
B. Unit shall be designed in accordance with UL Standard 564.
C. Unit shall be UL listed and CSA certified as a total
package for safety requirements.
D. Roof curb shall be designed to conform to NRCA
Standards.
E. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.
F. Cabinet insulation shall meet ASHRAE standard
no. 62.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory-assembled, single-piece heating and cooling
unit. Contained within the enclosure shall be all factory wiring, piping, controls, refrigerant charge
(R-22), and special features required prior to field
start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of phosphated,
zinc-coated prepainted steel, capable of withstanding 500 hours in salt spray.
2. Cabinet panels shall be easily removed for
servicing.
3. Indoor blower compartment interior cabinet surfaces shall be insulated with a minimum 1⁄2-in. thick,
flexible cleanable insulation, coated on the air side.
Aluminum foil-faced cleanable insulation shall be
used in the entire section.

26

D.

E.

F.

G.

H.

4. Unit shall utilize a sloped condensate drain pan.
External trap required.
Fans:
1. The indoor (evaporator) fan shall be 2- or 3-speed
direct-drive, as shown on equipment drawings.
2. Fan wheel shall be made from steel, be doubleinlet type with forward curved blades with corrosion resistant finish and be dynamically balanced.
3. Outdoor (condenser) fan shall be of the direct
driven, propeller type with aluminum blades riveted to corrosion resistant steel spiders, be dynamically balanced, and discharge air vertically
upwards and horizontally.
Compressor:
1. Fully hermetic compressor with factory-installed vibration isolation.
2. Rotary compressors shall be standard on unit
size 018. Reciprocating compressors shall be standard on unit sizes 024-042. Scroll compressors shall
be standard on unit sizes 048 and 060.
Coils:
Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless copper
tubes with all joints brazed. Tube sheet openings shall
be belled to prevent tube wear.
Heating Section:
1. Induced-draft combustion type with energy saving
direct spark ignition system and redundant main
gas valve.
2. Induced-draft motors shall be provided with solidstate hall effects sensor to ensure adequate airflow
for combustion.
3. The heat exchangers shall be constructed of aluminized steel for corrosion resistance.
4. Burners shall be of the in-shot type constructed of
aluminum coated steel.
5. Integrated gas control board shall provide control
of heating and simplify troubleshooting through
its built-in diagnostic function. The IGC shall provide timed control of indoor-fan functioning and
burner ignition. A light-emitting diode (LED) shall
provide diagnostic information. The IGC board
shall also contain anti-short cycle protection for
gas heat operation.
6. All gas piping and electric power shall enter the
unit cabinet at a single location.
Refrigerant Components:
Refrigerant components shall be of the Acutrol™ feed
system type.
Controls:
Unit shall be complete with self-contained low-voltage
control circuit.

I. Operating Characteristics:
1. Unit shall be capable of starting and running at
125 F ambient outdoor temperature per maximum load criteria of ARI Standard 210/240.
2. Compressor with standard controls shall be capable of operation in cooling down to 40 F ambient outdoor temperature.
3. Unit provided with fan time delay to prevent cold
air delivery before heat exchanger warms up.
4. Unit provided with fan time-delay after the thermostat is satisfied.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
location.
K. Motors:
1. Compressor motors shall be of the refrigerantcooled type with line break thermal and current
overload protection.
2. All fan motors shall have permanently lubricatedbearings and inherent automatic reset thermal
overload protection.
3. Condenser-fan motor shall be totally enclosed.
L. Special Features:
1. Roof Curb:
Curb shall have seal strip and a wood nailer for
flashing and shall be installed per manufacturer’s
instructions.
2. 25% Open Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset
to admit outdoor air for year-round ventilation.
3. Thermostat and Subbase:
To provide for one-stage heating and cooling
in addition to manual or automatic changeover
and fan control.
4. Electronic Programmable Thermostat:
Thermostat provides 2-stage heating and 2-stage
cooling control with remote communication
ability.
5. Natural-to-Propane Conversion Kit:
Kit shall be complete with burner orifice(s).

6. Low Ambient Package:
Package shall consist of a solid-state control and
condenser coil temperature sensor for controlling outdoor-fan motor operation, which shall allow unit to operate down to 0° F outdoor ambient temperature.
7. Compressor Short-Cycle Protection:
Solid-state control shall protect compressor by
preventing short cycling.
8. Lifting Bracket Kit:
Kit shall provide attachment points for rigging
straps. (Not required with optional base rail or
downflow option applications.)
9. High- and Low-Pressure Switch Kits:
Switches provide additional safety features and
protect the unit from running at unsuitable
pressures.
10. Filter Rack:
Rack provides mounting location for filters when
unit is in downflow application.
11. Crankcase Heater:
Heater warms crankcase oil to reduce refrigerant migration (recommended on 208/230-v, singlephase units in sizes 024-042).
12. Base Rail:
Base rail provides holes for rigging and handling,
and an elevated base for horizontal applications.
13. Downflow Option:
Option provides for vertical ductwork connections. Unit shall be equipped with base rail.
14. High Altitude Kit:
Kit shall have new burner orifices for use in applications from 2001 to 5000 feet.
15. Low NOx Kit:
Kit shall provide low NOx emissions for units being installed in California Air Quality Management Districts which require NOx emissions of
40 nanograms/joule or less.

27

Carrier Corporation • Syracuse, New York 13221

9-98

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 1a 6a

Page 28

Catalog No. 524-890

Printed in U.S.A.

PC 111

Form 48SS-4PD
Replaces: 48SS-3PD



---

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