Carrier 48SS User Manual
Product
Data
48SS
Single-Package
Gas Heating/Electric Cooling
Units
11⁄2to 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 NO
x
requirement of 40 nanograms/
joule or less when NO
kit
x
no. CRLOWNOX001A00 is
installed.
Durable, dependable
components
Top quality, top reliability compo-
nents 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 ap-
pearance 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.
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 compo-
nents 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.
2
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 1
024040
024060
030040
030060
030080
036060
036080
036100
036120
042060
042080
042100
042120
048080
048100
048120
048140
060080
060100
060120
060140
NOMINAL
TONS
1
⁄
2
2 800 24,000 10.0 7.6
1
2
⁄
2
3 1200 36,000 10.0 8.0
1
3
⁄
2
4 1600 47,000 10.0 8.2
5 1995 59,500 10.0 8.2
STANDARD
CFM
600 17,000 10.0 7.4
1000 29,200 10.0 8.0
1400 42,500 10.0 8.2
LEGEND
Bels — Sound Levels (1 bel = 10 decibels)
db — Dry Bulb
SEER — Seasonal Energy Efficiency Ratio
wb — 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.
NET COOLING†
CAPACITIES
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.
SEER†
SOUND RATINGS**
(Bels)
OUTDOOR SOUND: ONE-THIRD OCTAVE BAND DATA — DECIBELS
FREQUENCY (Hz)
63 49.8 38.1 45.7 47.8 45.5 56.0 54.3
125 56.5 55.0 58.1 59.3 61.2 65.6 65.1
250 60.3 65.3 68.7 67.4 70.4 71.5 71.5
500 59.8 67.2 64.7 68.8 69.9 71.4 72.7
1000 64.1 68.9 73.0 73.1 76.5 74.2 73.9
2000 64.1 65.5 70.2 69.5 71.3 73.3 73.4
4000 65.2 63.8 68.8 68.2 73.7 69.6 71.7
8000 56.0 60.3 66.6 65.8 65.5 67.1 66.3
Bels — Sound Levels (1 bel = 10 decibels)
018 024 030 036 042 048 060
UNIT 48SS
4
HEATING CAPACITIES AND EFFICIENCIES
LEGEND
HEATING INPUT
(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
UNIT 48SS
018040
024040
030040
024060
030060
036060
042060
030080
036080
042080
048080
060080
036100
042100
048100
060100
036120
042120
048120
060120
048140
060140
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.
OUTPUT CAPACITY
(Btuh)
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
5
Physical data
UNIT SIZE 48SS 018040 024040 024060 030040 030060 030080 036060 036080 036100 036120
1
⁄
NOMINAL CAPACITY (ton) 1
OPERATING WEIGHT (lb)
Without Base Rail 272 303 315 320 324 324 336 336 348 348
With Optional Base Rail 296 327 339 344 356 356 360 360 372 372
COMPRESSORS Rotary Reciprocating
Quantity 11
REFRIGERANT (R-22)
Charge (lb) 2.60 2.75 2.75 3.40 3.40 3.40 4.30 4.30 4.30 4.30
REFRIGERANT METERING DEVICE Acutrol™ Device
Orifice ID (in.) .030 .030 .030 .030 .030 .030 .032 .032 .032 .032
CONDENSER COIL
Rows...Fins/in. 1...17 1...17 1...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17
Face Area (sq ft) 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95
CONDENSER FAN
Nominal Cfm 1700 1700 1700 1900 1900 1900 1900 1900 1900 1900
Diameter (in.) 18 18 18 18 18 18 18 18 18 18
Motor Hp (Rpm)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft) 1.83 2.29 2.29 2.29 2.29 2.29 3.06 3.06 3.06 3.06
EVAPORATOR FAN Direct Drive
Nominal Airflow (Cfm) 600 800 800 1000 1000 1000 1200 1200 1200 1200
Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10
FURNACE SECTION*
Burner Orifice No. (Qty...drill size)
Natural Gas
Burner Orifice No. (Qty...drill size)
Propane Gas
RETURN-AIR FILTERS (in.)†
Throwaway 20x20 20x20 20x20 20x24 20x24 20x24 20x24 20x24 20x24 20x24
2
1
⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄4(1050)
3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15
1...32 1...32 2...40 1...32 2...40 2...32 2...40 2...32 2...30 3...32
1...41 1...41 2...47 1...41 2...47 2...42 2...47 2...42 2...40 3...42
222
1
⁄
2
1
2
⁄
2
1
2
⁄
2
3333
UNIT SIZE 48SS 042060 042080 042100 042120 048080 048100 048120 048140 060080 060100 060120 060140
1
⁄
2
31⁄
2
31⁄
2
31⁄
NOMINAL CAPACITY (ton) 3
OPERATING WEIGHT (lb)
Without Base Rail 375 375 387 387 414 426 426 426 453 465 465 465
With Optional Base Rail 399 399 411 411 438 450 450 450 477 489 489 489
COMPRESSORS Reciprocating Hermetic Scroll
Quantity 11
REFRIGERANT (R-22)
Charge (lb) 5.20 5.20 5.20 5.20 6.50 6.50 6.50 6.50 7.00 7.00 7.00 7.00
REFRIGERANT METERING Acutrol™ Device
DEVICE
Orifice ID (in.) .034 .034 .034 .034 .030 .030 .030 .030 .030 .030 .030 .030
CONDENSER COIL
Rows...Fins/in. 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17
Face Area (sq ft) 7.04 7.04 7.04 7.04 8.67 8.67 8.67 8.67 8.67 8.67 8.67 8.67
CONDENSER FAN
Nominal Cfm 1900 1900 1900 1900 2400 2400 2400 2400 2400 2400 2400 2400
Diameter (in.) 18 18 18 18 20 20 20 20 20 20 20 20
Motor Hp (Rpm)
EVAPORATOR COIL
Rows...Fins/in. 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 4...15 4...15 4...15 4...15
Face Area (sq ft) 3.33 3.33 3.33 3.33 4.44 4.44 4.44 4.44 4.44 4.44 4.44 4.44
EVAPORATOR FAN Direct Drive
Nominal Airflow (Cfm) 1400 1400 1400 1400 1600 1600 1600 1600 1995 1995 1995 1995
Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10
FURNACE SECTION*
Burner Orifice No.
(Qty...drill size)
Natural Gas
Burner Orifice No.
(Qty...drill size)
Propane Gas
RETURN-AIR FILTERS (in.)†
Throwaway 24 x 24 24 x 24 24 x 24 24 x 24 24 x 30 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.
1
⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)
2...40 2...32 2...30 3...32 2...32 2...30 3...32 3...31 2...32 2...30 3...32 3...31
2...47 2...42 2...40 3...42 2...42 2...40 3...42 3...40 2...42 2...40 3...42 3...40
2
44445555
6
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.
Field-installed accessories
Factory-assembled roof curbs are designed for use on
downflow discharge applications. Heavy gage, galvanized
steelconstructionprovides 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).
UNIT WITH OPTIONAL BASE RAIL
High- and low-pressure switches provide additional
safety features and protect the unit from running at unsuitable pressures.
Filter rackfeatures 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 NO
requirements for units being installedinCalifornia Air Quality Management Districts, which require NO
40 nanograms/joule or less.
kit provides compliance with low NOxemissions
x
emissions of
x
7
Base unit dimensions
48SS018-042 WITHOUT OPTIONAL BASE RAIL
REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel ........................0
Unit top .......................36(914)
Side opposite ducts ..................36(914)
Compressor access ..................36(914)
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs ............48(1219)
Unit top .......................14(356)
Duct side of unit ....................2(51)
Side opposite ducts ..................14(356)
Bottom of unit .......................0
Flue panel ......................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
48SS180040 208/230-1-60 272 123 81/37 62/28 76/35 53/24 24.1/613
48SS024040 208/230-1-60 303 138 97/44 43/20 123/56 40/18 24.1/613
48SS024060 208/230-1-60 315 143 100/45 46/21 126/57 43/20 24.1/613
48SS030040 208/230-1-60, 208/230-3-60 320 145 100/45 47/21 126/57 47/21 24.1/613
48SS030060/080 208/230-1-60, 208/230-3-60 324 147 94/43 63/29 115/52 52/24 24.1/613
48SS036060/080 208/230-1-60, 208/230-3-60, 460-3-60 336 153 86/39 76/35 111/50 63/29 24.1/613
48SS036100/120 208/230-1-60, 208/230-3-60, 460-3-60 348 158 89/40 79/36 114/52 66/30 24.1/613
48SS042060/080 208/230-1-60, 208/230-3-60, 460-3-60 375 170 95/43 86/39 119/54 75/34 28.1/714
48SS042100/120 208/230-1-60, 208/230-3-60, 460-3-60 387 176 98/45 89/40 122/55 78/35 28.1/714
UNIT
48SS018040
48SS024040 27.07/688 23.35/593
48SS024060 26.98/685 23.27/591
48SS030040 26.71/678 23.46/596
48SS030060/080 27.15/689 22.36/568
48SS036060/080 27.50/698 22.48/571
48SS036100/120 27.40/696 22.44/570
48SS042060/080
48SS042100/120 26.94/684 22.44/570
F
in./mm
9
⁄16/420.7 1815⁄16/481.0
16
9
⁄16/522.3 2215⁄16/582.6
20
ELECTRICAL
CHARACTERISTICS
G
in./mm
CENTER OF GRAVITY in./mm
XYZ
25.07/637 20.59/523
27.01/686 22.44/570
UNIT WEIGHT
lbkgABCD E
CG — Center of Gravity
COND — Condenser
LV — Low Voltage
10.85/276
12.7/321
NOTES:
1. Clearances must be maintained to prevent recirculation of air
from outdoor-fan discharge.
2. Adequate clearancearoundair openings into combustionchamber must be provided.
CORNER WEIGHT
(lb/kg)
LEGEND
MAT’L — Material
NEC — National Electrical Code
REQ’D — Required
8
UNIT HEIGHT
(in./mm)
48SS018-042 WITH OPTIONAL BASE RAIL
REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel ........................0
Unit top ......................36(914)
Side opposite ducts .................36(914)
Compressor access .................36(914)
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs ...........48(1219)
Unit top ......................14(356)
Duct side of unit ....................2(51)
Side opposite ducts .................14(356)
Bottom of unit .......................0
Flue panel .....................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
48SS018040 208/230-1-60 296 135 87/40 68/31 82/37 59/27 27.4/697
48SS024040 208/230-1-60 327 149 103/47 49/22 129/59 46/21 27.4/697
48SS024060 208/230-1-60 339 155 106/48 52/24 132/60 49/22 27.4/697
48SS030040 208/230-1-60, 208/230-3-60 344 157 106/48 53/24 132/60 53/24 27.4/697
48SS030060/080 208/230-1-60, 208/230-3-60 356 162 102/46 71/32 123/56 60/27 27.4/697
48SS036060/080 208/230-1-60, 208/230-3-60, 460-3-60 360 164 92/42 82/37 117/53 69/31 27.4/697
48SS036100/120 208/230-1-60, 208/230-3-60, 460-3-60 372 169 95/43 85/39 120/55 72/33 27.4/697
48SS042060/080 208/230-1-60, 208/230-3-60, 460-3-60 399 181 101/46 92/42 125/57 81/37 31.4/798
48SS042100/120 208/230-1-60, 208/230-3-60, 460-3-60 411 187 104/47 95/43 128/58 84/38 31.4/798
UNIT
48SS018040
48SS024040 26.90/683.3 20.17/512.3
48SS024060 26.82/681.2 20.22/513.6
48SS030040 26.57/674.9 20.1/ 509.3
48SS030060/080 26.93/684 21.1/535.4
48SS036060/080 27.31/693.7 21.0/532.6
48SS036100/120 27.23/691.6 21.0/533.1
48SS042060/080
48SS042100/120 26.81/681 21.0/533.7
F
in./mmGin./mm
7
19
⁄8/504.8 221⁄4/565.4
7
23
⁄8/606.4 261⁄4/666.8
ELECTRICAL
CHARACTERISTICS
CENTER OF GRAVITY in./mm
XYZ
25.04/636 22.72/577
26.87/682.5 21.0/533.1
UNIT WEIGHT
lbkgABCD E
CG — Center of Gravity
13.16/334.3
14.96/380
COND — Condenser
LV — Low Voltage
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.
CORNER WEIGHT
(lb/kg)
LEGEND
MAT’L — Material
NEC — National Electrical Code
REQ’D — Required
UNIT HEIGHT
(in./mm)
9
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