Carrier 25SCA5 PRODUCT DATA

25SCA5
Comfort™ Series Single-Stage Heat Pump
with Puron® Refrigerant
1-1/2 To 5 Tons

Product Data

This unit has been designed utilizing Carrier’s non-ozone depleting
Puron® refrigerant. Heat pumps with Puron® refrigerant provide a
collection of features unmatched by any other family of equipment.

NOTE: Ratings contained in this document are subject to change at any
time. Always refer to the AHRI directory (www.ahridirectory.org) for
the most up-to-date ratings information.

Industry leading

Features / Benefits

Efficiency

• 14.3 - 15.2 SEER2 / 11.0 - 12.5 EER2 / 7.5 - 8.1 HSPF2
(depending on unit size and indoor combination installed)

• Microtube technology refrigeration system

• Indoor air quality accessories available

Sound

• Sound levels as low as 69 dBA with accessory sound blanket

Comfort

• System supports programmable or standard thermostat controls

Reliability

• Non-ozone depleting Puron® refrigerant

• Scroll compressor

• Internal pressure relief valve

• Internal thermal overload

• Loss of charge switch

• Filter drier

• Balanced refrigeration system for maximum reliability

Durability

WeatherArmor™ Protection Package:

• Solid, durable sheet metal construction

• Dense wire coil guard

Applications

• Long-line - up to 250 feet (76.20 m) total equivalent length, up to 200
feet (60.96 m) condenser above evaporator, or up to 80 ft. (24.38 m)
evaporator above condenser (See Longline Guide for more
information.)

• Low ambient cooling (down to 0°F/-17.8°C) with approved low
ambient accessory kits

25SCA5: Product Data

Model Number Nomenclature

1 2 3 4 5 6 7,8 9 10 11 12

N N A A A/N N N A/N A/N A/N N

2 5 S C A 5 18 A 0 0 3

Refrigerant and

OD Type

25 = R-410A HP S = Single Stage C=Comfort A = Initial Series

OD Design Type Tier

Major

Series

SEER2

5=14.3

SEER2

Nominal Cooling

Capacity

18 = 18,000 BTUH (1.5 Tons) 24 = 24,000 BTUH (2 Tons) 30 = 30,000 BTUH (2.5 Tons) 36 = 36,000 BTUH (3 Tons) 42 = 42,000 BTUH (3.5 Tons) 48 = 48,000 BTUH (4 Tons) 60 = 60,000 BTUH (5 Tons)

Region Feature

A=Standard HP 0=Standard 0=Standard

Special
Feature

Tested AHRI Combination Ratings

NOTE: Ratings contained in this document are subject to change at any time.

For AHRI ratings certificates, please refer to the AHRI directory www.ahridirectory.org
Additional ratings and system combinations can be accessed via the Ratings Database here: www.MyCarrierRatings.com

Voltage

3=208-230-1
or 208/230-1

CATALOG ORDERING NUMBERS

Size Model Number

18 25SCA518A003

24 25SCA524A003

30 25SCA530A003

36 25SCA536A003

42 25SCA542A003

48 25SCA548A003

60 25SCA560A003

Standard Features

Feature 18 24 30 36 42 48 60

Puron Refrigerant

Scroll Compressor X X X X X X X

Field Installed Filter Drier X X X X X X X

Front Seating Service Valves X X X X X X X

Internal Pressure Relief Valve X X X X X X X

Internal Thermal Overload X X X X X X X

Long Line capability X X X X X X X

Low Ambient capability with Kit X X X X X X X

Suction Line Accumulator X X X X X X X

Loss of Charge Switch X X X X X X X

X = Standard

X X X X X X X

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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25SCA5: Product Data

Physical Data

Unit Size 18 24 30 36 42 48 60
Compressor Type Scroll
Refrigerant Puron® (R-410A)

Control TXV (Puron® Hard Shutoff) Charge (lb) 5.9 6.3 9.0 9.0 9.9 10.8 13.7 Outdoor Htg. Piston # 42 46 52 57 61 65 76 Cond Fan Forward Swept or Propeller Type, Direct Drive Air Discharge Vertical

Air Qty (CFM) 2346 2652 2652 3550 3716 3716 4779 Motor HP 1/12 1/10 1/10 1/4 1/4 1/4 1/4 Motor RPM 800 825 825 825 1110 1110 825

Cond Coil

Face Area (Sq ft) 15.0 17.2 15.0 15.0 17.2 19.3 25.1 Fins per In. 20 20 20 20 20 20 20 Rows 1 1 2 2 2 2 2 Circuits 6 6 7 7 10 12 12

Valve Connect (In. ID)

Vapor 5/8 5/8 3/4 3/4 7/8 7/8 7/8 Liquid 3/8"

Refrigerant Tubes

Rated Vapor†
(0-80 Ft Tube Length)

Rated Liquid Line

*. For 15 ft. lineset
†. Units are rated with 25 ft (7.6 m) of lineset length. See Vapor Line Sizing and Cooling Capacity Loss table when using other sizes and lengths of lineset.
‡. See Liquid Line Sizing For Cooling Only Systems with Puron Refrigerant tables.
Note: See unit Installation Instruction for proper installation.

*

(In. OD)

‡

(0-80 Ft Tube Length)

5/8 5/8 3/4 3/4 7/8 7/8 1 1/8

3/8"

Vapor Line Sizing and Cooling Capacity Loss

Acceptable vapor line diameters provide adequate oil return to the compressor while avoiding excessive capacity loss. The suction line diameters
shown in the chart below are acceptable for HP systems with Puron® refrigerant:

Vapor Line Sizing and Cooling Capacity Losses - Puron® Refrigerant 1- Stage Heat Pump Applications

Unit Nominal Size

(Btuh)

18,000

24,000

30,000

36,000

42,000

48,000

60,000

Standard Length = 80 ft. (24.4 m) or less total equivalent length

Applications in this area are long line. Accessories are required as shown recommended on Long Line Application Guidelines

Applications in this area may have height restrictions that limit allowable total equivalent length, when outdoor unit is below indoor unit See Long Line Application Guidelines

Acceptable

Vapor Line

Diameters (In.

OD)

1/2 1 2 3

5/8 0 0 1

5/8 0 1 1

3/4 0 0 0

5/8 1 2 3

3/4 0 0 1

7/8 0 0 0

5/8 1 2 4

3/4 0 0 1

7/8 0 0 0

3/4 0 1 2

7/8 0 0 1

3/4 0 1 2

7/8 0 0 1

3/4 1 2 4

7/8 0 1 2

1 1/8 0 0 0

Standard Application

25

(7.62)50(15.2)80(24.4)

80+

(24.4+)

3 4 6 7 8 9 10 12

1 1 1 2 2 3 3 3

1 2 3 3 4 4 5 6

0 0 1 1 1 1 1 2

3 3 4 5 6 7 8 9

1 1 1 2 2 2 3 3

0 0 1 1 1 1 1 1

4 5 6 7 9 10 11 13

1 1 2 2 3 3 4 4

0 0 1 1 1 1 2 2

2 2 3 4 4 5 6 6

1 1 1 2 2 2 3 3

2 3 4 5 5 6 7 8

1 1 2 2 2 3 3 4

4 5 6 7 9 10 11 12

2 2 3 4 4 5 5 6

0 1 1 1 1 1 1 2

Cooling Capacity Loss (%)

Total Equivalent Line Length (ft)

Long Line Application Requires A ccessories

100

(30.48)

125

(38.10)

150

(45.72)

175

(53.34)

200

(60.96)

(68.58)

225

250

(76.20)

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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25SCA5: Product Data

Refrigerant Piping Length Limitations

Maximum Line Lengths:

The maximum allowable total equivalent length for heat pumps varies depending on the vertical separation. See the tables below for allowable lengths
depending on whether the outdoor unit is on the same level, above or below the outdoor unit.

Maximum Line Lengths for Heat Pump Applications

MAXIMUM ACTUAL LENGTH

Units on equal level 200 (61) 250 (76.2) N/A

Outdoor unit ABOVE

indoor unit

Outdoor unit BELOW

indoor unit

*.* Maximum actual length not to exceed 200 ft (61 m)

ft (m)

200 (61) 250 (76.2) 200 (61)

*

See Table ’Maximum Total Equivalent Length: Outdoor Unit BELOW Indoor Unit’

MAXIMUM EQUIVALENT LENGTH{

ft (m)

MAXIMUM VERTICAL SEPARATION

ft (m)

Maximum Total Equivalent Length*{ - Outdoor Unit BELOW Indoor Unit

Puron® Refrigerant - Maximum Total Equivalent Length

21-30

HP with

Vertical Separation ft (m) Outdoor unit BELOW indoor unit;

31-40

(9.4 - 12.2)

41-50

(12.5 - 15.2)

51-60

(15.5 - 18.3)

61-70

(18.6 - 21.3)

71-80

(21.6 - 24.4)

Size

18,000 3/8 250* 250* 250* 250* 250* 250* 250*

24,000 3/8 250* 250* 250* 250* 250* 250* 250*

30,000 3/8 250* 250* 250* 250* 250* 250* 250*

36,000 3/8 250* 250* 250* 250* 250* 250* 250*

42,000 3/8 250* 250* 250* 250* 250* 250* 150

48,000 3/8 250* 250* 250* 250* 230 160 —

60,000 3/8 250* 225* 190 150 110 — —

*.Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
— = outside acceptable range

Liquid Line

Diameter

w/ TXV

0-20

(0 - 6.1)

(6.4 - 9.1)

Long Line Applications

An application is considered Long Line when the refrigerant level in the system requires the use of accessories to maintain acceptable refrigerant
management for systems reliability. Defining a system as long line depends on the liquid line diameter, actual length of the tubing, and vertical
separation between the indoor and outdoor units.

For Heat Pump systems, the chart below shows when an application is considered Long Line. Beyond these lengths, long line accessories are
required:

HP with Puron® Refrigerant Long Line Description ft (m)

Beyond these lengths, long line accessories are required

Liquid Line Size Units On Same Level Outdoor Below Indoor Outdoor Above Indoor

3/8 80 (24.4) 20 (6.1) vertical or 80 (24.4) total 80 (24.4)

Note: See Long Line Guideline for details

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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25SCA5: Product Data

Accessories

KIT NUMBER KIT NAME 18 24 30 36 42 48 60

KAACH1701AAA Crankcase Heater X X X X

KAACH1601AAA Crankcase Heater X X S

KAATD0101TDR Time Delay Relay X X X X X X X

KHAIR0201AAA Isolation Relay X X X X X X X

KHALS0401LLS Solenoid Valve Kit X X X X X X X

KHASS0606MPK Snow Stand X X X X X X X

KSACY0101AAA Cycle Protector X X X X X X X

KSAFT0101AAA Evaporator Freeze Stat X X X X X X X

KSAHI0401PUR High Pressure Switch Kit X X X X X X X

KSAHS2501AAA Hard Start X X X X X X X

KSALA0301410 Low Ambient Cooling Pressure Switch X X X X X X X

KSALA1001AAA MotorMaster X X X X X X X

KSATX0201PUR TXV Kit X X X

KSATX0301PUR TXV Kit X X

KSATX0401PUR TXV Kit X X

KSBTX0201PUR TXV Kit X X X

KSBTX0301PUR TXV Kit X X

KSBTX0401PUR TXV Kit X X

KSASH2301COP Sound Blanket X X X X

KSASH2401COP Sound Blanket X X X

KSASF0201AAA Support Feet X X X X X X X

X = Accessory
S = Standard

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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25SCA5: Product Data

Accessory Usage Guideline

Accessory

Accumulator Standard Standard Standard

Ball Bearing Fan Motor Standard Standard Standard

Compressor Start Assist Capacitor and

Relay

Crankcase Heater

Evaporator Freeze Thermostat Yes No No

Hard Shutoff TXV Yes Yes No

Isolation Relay Yes No No

Liquid Line Solenoid Valve No

Motor Master® Control or

Low Ambient Switch

Support Feet Recommended No Recommended

*. For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Split-System Longline Application Guideline.
†. Standard on 3 phase units only

REQUIRED FOR LOW-AMBIENT

COOLING APPLICATIONS

(Below 55°F / 12.8°C)

Yes Yes No

†

Yes

Yes No No

See Long-Line Application Guideline

REQUIRED FOR

LONG LINE APPLICATIONS

Yew No

*

Accessory Description and Usage (Listed Alphabetically)

1. Ball-Bearing Fan Motor

A fan motor with ball bearings which permits speed reduction while
maintaining bearing lubrication.

Usage Guideline:

Required on all units when MotorMasterr is used.

2. Compressor Start Assist - Capacitor and Relay

Start capacitor and relay gives a ”hard” boost to compressor motor at
each start up.

Usage Guideline:

Required for single-phase scroll compressors in the following

applications:

Long line

Low ambient cooling

Suggested for all compressors in areas with a history of low voltage

problems.

3. Crankcase Heater

An electric resistance heater which mounts to the base of the compressor
to keep the lubricant warm during off cycles. Improves compressor
lubrication on restart and minimizes the chance of liquid slugging.

Usage Guideline:

Required in low ambient cooling applications.

Required in long line applications.

Suggested in all commercial applications.

4. Cycle Protector

The cycle protector is designed to prevent compressor short cycling.
This control provides an approximate 5-minute delay after power to the
compressor has been interrupted for any reason, including power outage,
protector control trip, thermostat jiggling, or normal cycling.

5. Evaporator Freeze Thermostat

An SPST temperature-actuated switch that stops unit operation when
evaporator reaches freeze-up conditions.

Usage Guideline:

Required when low ambient kit has been added.

6. Low-Ambient Pressure Switch Kit

A long life pressure switch which is mounted to outdoor unit service
valve. It is designed to cycle the outdoor fan motor in order to maintain
head pressure within normal operating limits (approximately 100 psig to
225 psig). The control will maintain working head pressure at
low-ambient temperatures down to 0_F (-18_C) when properly installed
and also using wind baffles. Instructions provided in accessory kit.

Usage Guideline:

A Low-Ambient Pressure Switch or MotorMasterr Low-Ambient
Controller must be used when cooling operation is used at outdoor
temperatures below 55_F (12.8_C).

7. MotorMasterr Low-Ambient Controller

A fan-speed control device activated by a temperature sensor, designed
to control condenser fan motor speed in response to the saturated,
condensing temperature during operation in cooling mode only. For
outdoor temperatures down to 0°F/–17.8°C), it maintains condensing
temperature at 100_F ±10_F (37.8_C ±5.5_C).

Usage Guideline:

A MotorMasterr Low Ambient Controller or Low-Ambient
Pressure Switch must be used when cooling operation is used at
outdoor temperatures below 55_F (12.8_C).

Suggested for all commercial applications.

8. Outdoor Air Temperature Sensor

This device enables the thermostat to display the outdoor temperature.
This device is also required to enable special thermostat features such as
auxiliary heat lock out.

Usage Guideline:

Suggested for use with compatible Carrier thermostats.

9. Sound Hood

Wraparound sound reducing cover for the compressor. Reduces the
sound level of the compressor.

Usage Guideline:

Suggested when unit is installed closer than 15 ft (4.57 m) to quiet
areas, bedrooms, etc.

Suggested when unit is installed between two houses less than
10 ft (3 m) apart.

REQUIRED FOR

SEA COAST APPLICATIONS

(Within 2 miles / 3.22 km)

No

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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