Friedrich CP24N30 Owner's manual

Brand: Friedrich

Model: CP24N30

Category: Split-system air conditioners

Type: Owner's manual

Service Manual

Compact Programmable

CP-14-18-24-ServMan (04-09)

Models

2009

2008

FRIEDRICH AIR CONDITIONING CO.

Post Ofce Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212

(210) 357-4400 · FAX (210) 357-4490

www.friedrich.com

Printed in the U.S.A.

TECHNICAL SUPPORT

CONTACT INFORMATION

Table Of Contents

Important Safety Information ........................................................................................................................................ 2-4

Introduction ...................................................................................................................................................................... 4

Unit Identication ............................................................................................................................................................. 5

Electrical Data .............................................................................................................................................................. 6-7

Specications and Performance Data .......................................................................................................................... 8-9

Functional Components Denitions ............................................................................................................................... 10

Air Conditioner Use ........................................................................................................................................................ 10

How to Operate the Friedrich CP Room Air Conditioner ........................................................................................... 11-12

Refrigeration Sequence of Operation ............................................................................................................................. 13

Sealed Refrigeration System Repairs ....................................................................................................................... 14-17

Method of Charging/Repairs ........................................................................................................................................... 15

Metering Device ...............................................................................................................................................................18

Compressor Checks ...................................................................................................................................................18-22

Routine Maintenance ................................................................................................................................................. 23-24

Troubleshooting ......................................................................................................................................................... 25-28

Wiring Diagrams for 2009 Models .................................................................................................................................. 29

Wiring Diagrams for 2008 Models .................................................................................................................................. 30

Parts for 2009 Models ............................................................................................................................................... 31-34

Parts for 2008 Models ............................................................................................................................................... 35-37

Warranty ......................................................................................................................................................................... 38

IMPORTANT SAFETY INFORMATION

The information contained in this manual is intended for use by a qualied service technician who is familiar

with the safety procedures required for installation and repair, and who is equipped with the proper tools and

test instruments required to service this product.

Installation or repairs made by unqualied persons can result in subjecting the unqualied person making

such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical

shock which can be serious or even fatal.

Safety warnings have been placed throughout this manual to alert you to potential hazards that may be

encountered. If you install or perform service on equipment, it is your responsibility to read and obey these

warnings to guard against any bodily injury or property damage which may result to you or others.

PERSONAL INJURY OR DEATH HAZARDS

ELECTRICAL HAZARDS:

Unplug and/or disconnect all electrical power to the unit before performing inspections, •

maintenance, or service.

Make sure to follow proper lockout/tag out procedures.•

Always work in the company of a qualied assistant if possible. •

Capacitors, even when disconnected from the electrical power source, retain an electrical charge •

potential capable of causing electric shock or electrocution.

Handle, discharge, and test capacitors according to safe, established, standards, and approved •

procedures.

Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary •

to test or troubleshoot equipment with the power on to the unit.

Your safety and the safety of others are very important.

We have provided many important safety messages in this manual and on your appliance. Always read

and obey all safety messages.

All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,

and tell you what will happen if the instructions are not followed.

This is a safety Alert symbol.

This symbol alerts you to potential hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol with the word “WARNING”

or “CAUTION”. These words mean:

You can be killed or seriously injured if you do not follow instructions.

You can receive minor or moderate injury if you do not follow instructions.

A message to alert you of potential property damage will have the

word “NOTICE”. Potential property damage can occur if instructions

are not followed.

WARNING

CAUTION

NOTICE

Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel, •

and sleeve on the room side of the air conditioning unit while cleaning.

Electrical component malfunction caused by water could result in electric shock or other electrically •

unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.

Never operate the A/C unit with wet hands.•

Use air conditioner on a single dedicated circuit within the specied amperage rating. •

Use on a properly grounded outlet only.•

Do not remove ground prong of plug.•

Do not cut or modify the power supply cord.•

Do not use extension cords with the unit.•

Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, •

goggles, clothing, adequately insulated tools, and testing equipment etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death. •

REFRIGERATION SYSTEM HAZARDS:

Use approved standard refrigerant recovering procedures and equipment to relieve pressure before •

opening system for repair.

Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor •

to moderate injury.

Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s ame or hot •

surfaces can cause serious burns.

Make sure to protect personal and surrounding property with re proof materials.•

Have a re extinguisher at hand while using a torch.•

Provide adequate ventilation to vent off toxic fumes, and work with a qualied assistant whenever •

possible.

Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for •

leaks, ushing etc.

Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves, •

safety glasses, clothing etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death. •

MECHANICAL HAZARDS:

Extreme care, proper judgment and all safety procedures must be followed when testing, •

troubleshooting, handling, or working around unit with moving and/or rotating parts.

Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and •

other unit components especially the sharp ns of the indoor and outdoor coils.

Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.•

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.•

PROPERTY DAMAGE HAZARDS

FIRE DAMAGE HAZARDS:

Read the Installation/Operation Manual for this air conditioning unit prior to operating.•

Use air conditioner on a single dedicated circuit within the specied amperage rating. •

Connect to a properly grounded outlet only.•

Do not remove ground prong of plug.•

Do not cut or modify the power supply cord.•

Do not use extension cords with the unit.•

Failure to follow these instructions can result in re and minor to serious property damage.•

WATER DAMAGE HAZARDS:

Improper installation maintenance, or servicing of the air conditioner unit, or not following the above •

Safety Warnings can result in water damage to personal items or property.

Insure that the unit has a sufcient pitch to the outside to allow water to drain from the unit. •

Do not drill holes in the bottom of the drain pan or the underside of the unit. •

Failure to follow these instructions can result in result in damage to the unit and/or minor to serious •

property damage.

INTRODUCTION

This service manual is designed to be used in conjunction with the installation manuals provided with each unit.

This service manual was written to assist the professional HVAC service technician to quickly and accurately

diagnose and repair any malfunctions of this product.

This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).

IMPORTANT:

It will be necessary for you to accurately identify the unit you are

servicing, so you can be certain of a proper diagnosis and repair.

(See Unit Identication.)

Cabinet

Airinlet louver

Front grille

Powercord

Control panelcover

Frontintakegrille

Airfilter

(behindfront intake grille)

Serial Number

Decade Manufactured

L=0 C=3 F=6 J=9

A=1 D=4 G=7

B=2 E=5 H=8

L H G K 00001

Production Run Number

Year Manufactured

A=1 D=4 G=7 K=0

B=2 E=5 H=8

C=3 F=6 J=9

Product Line

K = RAC

Month Manufactured

A=Jan D=Apr G=Jul K=Oct

B=Feb E=May H=Aug L=Nov

C=Mar F=Jun J=Sept M=Dec

3rd and 4th Digit - Approximate

BTU/HR (Cooling)

Heating BTU/Hr capacity listed in the

Specication/Performance Data Section

7th Digit – Options

0 = Straight Cool &

Heat Pump Models

6th Digit – Voltage

1 = 115 Volts

3 = 230-208 Volts

5th Digit

Alphabetical Modier

COMPACT

PROGRAMMABLE

Model Number Code

C P 08 E 1 0

RAC Serial Number Identication Guide

UNIT IDENTIFICATION

ELECTRICAL DATA

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation.

All electrical connections and wiring MUST be

installed by a qualied electrician and conform to

the National Electrical Code and all local codes

which have jurisdiction.

Failure to do so can result in personal injury or

death.

Not following the above WARNING could result in re or

electically unsafe conditions which could cause moderate

or serious property damage.

Read, understand and follow the above warning.

NOTICE

FIRE HAZARD

Wire Size Use ONLY wiring size recommended for single outlet branch circuit.

Fuse/Circuit Breaker Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on unit’s

rating plate. Proper circuit protection is the responsibiity of the homeowner.

Grounding Unit MUST be grounded from branch circuit through service cord to unit, or through separate

ground wire provided on permanently connected units. Be sure that branch circuit or general

purpose outlet is grounded. Ground wire must be connected to ground screw located in lower

right corner of air conditioner when air conditioner is in cabinet. (CP 14, 18, 24)

Receptacle The eld supplied outlet must match plug on service cord and be within reach of service cord.

Do NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above

for proper receptacle and fuse type.

Plug/Outlet/Circuit Rating

Model

Circuit Rating

Breaker or T-D Fuse

Plug Face

(NEMA#)

Power Cord

Length (ft.)

Wall Outlet

Appearance

CP14 125V - 15A 5 - 15P 6

CP18 250V - 15A 6 - 15P 4

CP24 250V - 20A 6 - 20P 4

ELECTRICAL SHOCK HAZARD

WARNING

Plug into a grounded 3 prong outlet.

Do not remove powercord ground prong.

Do not use a plug adapter.

Do not use an extension cord.

Failure to follow these instructions can

result in death, re, or electrical shock.

This air conditioner must be grounded. This air conditioner

is equipped with a power supply cord having a grounded 3

prong plug. To minimize possible shock hazard, the cord

must be plugged into a mating, grounded 3 prong outlet,

grounded in accordance with all local codes and ordinances.

If a mating outlet is not available, it is the customer’s

responsibility to have a properly grounded 3 prong outlet

installed by a qualied electrical component installer.

It is the customer’s responsibility:

To contact a qualied electrical installer, and to assure

that the electrical installation is adequate and in

conformance with National Electrical Code, ANSI/NFPA

70 - latest edition, and all local codes and ordinances.

Copies of the standards listed may be obtained from:

National Fire Protection Association

One Batterymarch Park

Quincy, MA 02269

Recommended grounding method

To test your power supply cord:

1. Plug power supply cord into a grounded 3 prong outlet.

2. Press RESET.

3. Press TEST (listen for click; Reset button will trip and

pop out).

4. Press and release RESET (listen for click; Reset butto

will latch and remain in). The power supply cord is ready

for operation.

NOTES:

The Reset button must be pushed in for proper

operation.

The power supply cord must be replaced if it fails to trip

when the test button is pressed or if it fails to reset.

Do not use the power supply cord as an off/on switch.

The power supply cord is designed as a protective

device.

A damaged power supply cord must be replaced with

a new power supply cord obtained from the product

manufacturer and must not be repaired.

The power supply cord contains no user serviceable

parts. Opening the tamper-resistant case voids all

warranty and performance claims.

Power Supply Cord

NOTE: Your unit’s device may differ from the ones shown.

A. Reset button

B. Test button

This room air conditioner is equipped with a power supply

cord required by UL. This power supply cord contains

state-of-the-art electronics that sense leakage current. If

the cord is crushed, the electronics detect leakage current

and power will be disconnected in a fraction of a second.

TEST

RESET

SPECIFICATIONS FOR 2009 MODELS

Performance Data

PERFORMANCE

DATA* Cooling

EVAP. AIR TEMP.

DEG. F

CONDENSER

TEMPERATURE

DEG. F

Discharge

Temp

Suction

Temp

Super

Heat

Sub-Cooling

OPERATING

PRESSURES

ELECTRICAL RATINGS R-22 REF.

Voltage

BREAKER

FUSE

Discharge

Air

Temp.

Drop F.

Suction Discharge

Amps

Cool

Amps

Heat

Locked

Rotor Amps

Charge in

OZ.

60 Hertz

Amps

CP14N10

59 21 118 173 56 41 54 78 267 12.1 / 58 26.5 115 15

CP18N30

58 22 119 173 66 52 55 77 269 8.3 /

38.9/42.4 27.9

230

802/5.8 962 775525 66 271 911 32 75

CP24N30

57 23 117 197 60 44 50 75 264 12.3 /

56A(230V) 33.5

230

802/1.31 462 570544 75 591 711 42 65

*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity.

Compressor Type

Rotary Rotary Rotary

L.R.A. (A)

61 42 60

Compressor RLA(A)

11.5 11.2/10.7

Compressor Power Input(W)

1060

2310/2390

Overload Protector

InternalExternal Internal

Throttling Method

Capillary Capillary Capillary

Starting Method Capacitor Capacitor Capacitor

Working Temp Range (

)

50°-115° 50°-115° 50°-115°

Condenser

Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube

Fan Type-Piece

Axial fan –1 Axial fan –1 Axial fan –1

an Diameter (inches)

15.59 15.59 15.59

900/780/730 1000/900/800 1060/970/820

205 297 320

1.78 1.29 1.39

15 7 7

300 300 300

150 150 150

X 26 X 27

⅝

X 26 X 29

121 141 165

R22/28.57 R22/32.10 R22/37.04

Outdoor

Side

Fan Motor Speed (rpm) (H/M/L)

Output of Fan Motor (W)

Fan Motor RLA(A)

Fan Motor Capacitor (uF)

Net

Weight

Refrigerant Charge (oz)

Permissible Excessive Operating

Pressure for the Discharge

Side(PSI)

Permissible Excessive Operating

Pressure for the Suction Side(PSI)

Dimension (W/H/D)

7.5

1606

CP14E10 CP18E30 CP24E30

COOLING

115V 208~230V 208~230V

60Hz 60Hz 60Hz

14700(Btu/h) 18000 /18450(Btu/h)

/ (Btu/h)

1370 1680/1730 2660/2690

1757W 2259W 3295W

17.61A 9.02A 15A

798/730/696 968/918/866 1002/950/866

5.28 5.92 9.93

10.8 10.8 / 10.8 9.4 / 9.4

Fan Type-Piece Centrifugal flow fan – 1 Centrifugal flow fan – 1 Centrifugal flow fan – 1

Diameter-Length (inch) 8.82 X 4.31 8.82 X 4.31 8.82 X 4.31

Evaporator Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube

Pipe Diameter (inches)

.276 .276 .276

Coil length (l) x height (H) x

coil width (L)

422 X 381 X 25.4 422 X 381 X 25.4 422 X 381 X 25.4

Model

Function

Rated Voltage

Rated Input (W)

Rated Current (A)

Air Flow Volume

(CFM) (H/M/L)

Rated Frequency

Total Capacity (W/

Btu/h)

Power Input (W)

Indoor

Side

Dehumidifying Volume (pints/h)

EER

PERFORMANCE

DATA* Cooling

EVAP. AIR TEMP.

DEG. F

CONDENSER

TEMPERATURE

DEG. F

Discharge

Temp

Suction

Temp

Super

Heat

Sub-Cooling

OPERATING

PRESSURES

ELECTRICAL RATINGS R-22 REF.

Voltage

BREAKER

FUSE

Discharge

Air

Temp.

Drop F.

Suction Discharge

Amps

Cool

Amps

Heat

Locked

Rotor Amps

Charge in

OZ.

60 Hertz

Amps

CP14N10

59 21 118 173 56 41 54 78 267 12.1 / 58 26.5 115 15

CP18N30

58 22 119 173 66 52 55 77 269 8.3 /

38.9/42.4 27.9

230

802/5.8 962 775525 66 271 911 32 75

CP24N30

57 23 117 197 60 44 50 75 264 12.3 /

56A(230V) 33.5

230

802/1.31 462 570544 75 591 711 42 65

*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity.

Compressor Type

Rotary Rotary Rotary

L.R.A. (A)

58 42 56

Compressor RLA(A)

10.9 11.7/11.0

Compressor Power Input(W)

1182

2425/2480

Overload Protector

ExternalExternal Internal

Throttling Method

Capillary Capillary Capillary

Starting Method Capacitor Capacitor Capacitor

Working Temp Range (

)

50°-115° 50°-115° 50°-115°

Condenser

Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube

Fan Type-Piece

Axial fan –1 Axial fan –1 Axial fan –1

an Diameter (inches)

15.59 15.59 15.59

900/780/730

900/780/730 1000/900/800

200 200 190

3 1.45 1.35

15 7 7

300 300 300

150 150 150

X 26 X 27

⅝

X 26 X 27

⅝

X 26 X 29

121 141 165

R22/26.46 R22/27.87 R22/33.51

Outdoor

Side

Fan Motor Speed (rpm) (H/M/L)

Output of Fan Motor (W)

Fan Motor RLA(A)

Fan Motor Capacitor (uF)

Net

Weight

Refrigerant Charge (oz)

Permissible Excessive Operating

Pressure for the Discharge

Side(PSI)

Permissible Excessive Operating

Pressure for the Suction Side(PSI)

Dimension (W/H/D)

7.45

1700

CP14N10 CP18N30 CP24N30

COOLING

115V 230V/208V~ 230V/208V~

60Hz 60Hz 60Hz

14000(Btu/h) 18000 /17600(Btu/h) 23500/23100(Btu/h)

1430 1850/1810 2740/2710

1540W 2478W 3538W

15A 12.57A 18.09A

458.8 458.8 617.6

3.38 4.65 8.46

9.8 9.7 / 9.7 8.6 / 8.5

Fan Type-Piece Centrifugal flow fan – 1 Centrifugal flow fan – 1 Centrifugal flow fan – 1

Diameter-Length (inch) 7.93 X 4.31 7.93 X 4.31 8.82 X 4.31

Evaporator Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube

Pipe Diameter (inches)

0.276 0.276 0.276

Coil length (l) x height (H) x

coil width (L)

16.61 X 15 X 1 16.61 X 15 X 1 16.61 X 15 X 1

Model

Function

Rated Voltage

Rated Input (W)

Rated Current (A)

Air Flow Volume

(CFM) (H/M/L)

Rated Frequency

Total Capacity (W/Btu/h)

Power Input (W)

Indoor

Side

Dehumidifying Volume (pints/h)

EER

SPECIFICATIONS FOR 2008 MODELS

Performance Data

COMPONENT DEFINITIONS

A. Mechanical components

B. Electrical components

C. Hermetic components

Vent door

Exhausts stale room air outside.

Plenum assembly

Diffuser with directional louvers used to direct the conditioned airow.

Blower wheel

Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air through

the heat exchanger and delivering conditioned air into the room.

Slinger fan blade

Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil, while

slinging condensate water out of the base pan and onto the condenser coil, thus lowering the temperature and

pressures within the coil.

Thermistor

A sensor that automatically responds to temperature changes.

Capacitor

Reduces line current and steadies the voltage supply, while greatly improving the torque characteristics of the fan

motor and compressor motor.

MoneySaver® switch

Used to regulate the operation of the fan motor and the compressor or to turn the unit off. For troubleshooting, refer

to the wiring diagrams and schematics in the back of this service manual.

Fan Motor

Dual-shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously.

Compressor

Motorized device used to compress refrigerant through the sealed system.

Capillary tube

A cylindrical meter device used to evenly distribute the ow of refrigerant to the heat exchangers (coils).

AIR CONDITIONER USE

Operating the air conditioner properly helps you to obtain

the best possible results.

This section explains proper air conditioner operation.

IMPORTANT:

If you turn off the air conditioner, wait at least 3 minutes

before turning it back on. This prevents the air conditioner

from blowing a fuse or tripping a circuit breaker.

Do not try to operate your air conditioner in the cool-

ing mode when outside temperature is below 65°F

(18°C). The inside evaporator coil will freeze up, and

the air conditioner will not operate properly.

NOTE: In the event of a power failure, your air condi-

tioner will operate at the previous settings when the

power is restored.

1. Press POWER to turn on air conditioner.

NOTE: When the unit is turned on, it will display the previous

settings for the Mode, Fan Speed and temperature.

2. Choose mode. See “Mode.”

3. Choose fan speed. See “Fan Speed.”

4. Choose temperature. See “Temperature.”

Mode

1. Press and hold MODE.

Cool—Cools room. Press FAN SPEED to choose fan

speed. Then adjust the temperature by pressing the up or

down arrow buttons.

Fan—Operates the fan at High speed, without cool ing.

The display shows “FO” (fan only).

Fan Speed

NOTE: The Fan Speed button will operate only when the Cool or

Power Saver mode ha s been selected.

1. Press and hold FAN SPEED until you see the indicator light

for the desired setting.

2. Choose High, Medium or Low.

Temperature

Press, or press and hold, the plus button to raise the

temperature 1º until it reaches 86ºF (30ºC).

Press, or press and hold, the minus button to lower the

temperature 1º until it reaches 64ºF (18ºC).

Timer Delay

To set the Timer for a 1- to 24-hour delay until the air

conditioner turns o (the air conditioner must be On):

1. Press TIMER. Indicator light will ash.

2. Press the plus or minus button to change the delay time from

1 to 24 hours.

3. Press TIMER or wait 10 seconds. Indicator light will remain

on.

To set the Timer delay for a 1- to 24-hour delay until the air

conditioner turns on, keeping previous settings:

1. Turn o air conditioner.

2. Press TIMER. Indicator light wi

ll ash.

3. Press the plus or minus button to change the delay time from

1 to 24 hours.

4. Press TIMER or wait 10 seconds. Indicator light will remain

on.

To set the Timer delay for a 1- to 24-hour delay until the air

conditioner turns on, changing previous settings:

1. Turn on air conditioner.

2. Adjust MODE to desired setting.

3. Adjust FAN SPEED to High, Medium or Low.

4. Adjust temperature between 64ºF (18ºC) and 86ºF (30ºC).

5. Turn o air conditioner.

6. Press TIMER. Indicator light will ash.

7. Press the plus or minus button to change delay time from 1 to

24 hours.

8. Press TIMER or wait 10 seconds.

To clear Timer delay program

NOTE: Air conditioner can be either on or o.

Press and hold TIMER for 3 seconds. Indicator light will turn o.

To see the time remaining (in hours)

1. Press TIMER once after it has been set.

2. While the display is showing the remaining time, you can

press the plus or minus button to increase or decrease the

time.

POWER

Temp/Hour

Timer

Fan Speed

Fan Only

Cool

Money

Saver

High

Med

Low

Mode

Hr.

Auto Swing

Temp/Hour

Hr.

Timer

Money Saver — Turns fan to low speed when

room temperature reaches the temperature setting

on the thermostat.

Fan Only

Cool

Mode

Money

Saver

Fan Speed

High

Med

Low

POWER

Money Saver

Choose Cool or Fan mode

How to operate the Friedrich room air conditioner

To operate air conditioner with remote control

NOTE: Remote control may vary in appearance.

NOTE: Two AAA batteries (included) power the remote control.

Replace batteries after 6 months of use, or when the remote

control starts to lose power.

To turn the air conditioner on or o:

Press POWER.

To select the mode:

To select the fan speed:

Press FAN SPEED for High, Medium or Low.

To raise the temperature:

Press the plus button to raise the temperature. Each time you

press or hold

the plus button, the temperature will go up 1º until it

reaches 86°F (30°C).

To lower the temperature:

Press the minus button to lower the temperature. Each time you

press or hold the minus button, the temperature will go down 1º

until it reaches 64°F (18°C).

To set Timer for a 1- to 24-hour delay before air conditioner

is turned o (air conditioner must be On):

1. Press TIMER. Indicator light on air conditioner control panel

will ash.

2. Press the plus or minus b

utton to change the delay time from

1 to 24 hours.

3. Press TIMER again or wait 10 seconds. Indicator light on air

conditioner control panel will remain on.

To set Timer to turn on air conditioner, keeping previous

settings:

1. Turn o air conditioner.

2. Press TIMER. Indicator light on air conditioner control panel

will ash.

3. Press the plus or minus button to change delay time (1 to

24 hours).

4. Press TIMER again or wait 10 seconds. Indicator light on air

conditioner control panel will remain on.

To set Timer to turn on air conditioner, changing the

previous settings:

1. Turn on air conditioner.

2. Adjust Mode to Cool, Fan Only, or Power Saver.

3. Adjust Fan Speed to High, Medium or Low.

4. Adjust temperature between 64°F (18ºC) and 86°F (30ºC).

5. Turn o air conditioner.

6. Press TIMER. Indicator light on air conditioner control panel

will ash.

7. Press the plus or minus button to change delay time (1 to

24 hours).

8. Press TIMER again or

wait 10 seconds. Indicator light on air

conditioner control panel will remain on.

Press COOL, FAN or $ SAVER

Suction

Line

Evaporator

Coil

Metering

Device

Refrigerant

Strainer

Discharge

Line

Condenser

Coil

Compressor

Refrigerant Drier

Liquid

Line

A good understanding of the basic operation of the

refrigeration system is essential for the service technician.

Without this understanding, accurate troubleshooting of

refrigeration system problems will be more difcult and time

consuming, if not (in some cases) entirely impossible. The

refrigeration system uses four basic principles (laws) in its

operation they are as follows:

1. “Heat always ows from a warmer body to a cooler

body.”

2. “Heat must be added to or removed from a substance

before a change in state can occur”

3. “Flow is always from a higher pressure area to a lower

pressure area.”

4. “The temperature at which a liquid or gas changes state

is dependent upon the pressure.”

The refrigeration cycle begins at the compressor. Starting

the compressor creates a low pressure in the suction line

which draws refrigerant gas (vapor) into the compressor.

The compressor then “compresses” this refrigerant, raising

its pressure and its (heat intensity) temperature.

The refrigerant leaves the compressor through the discharge

Line as a hot High pressure gas (vapor). The refrigerant

enters the condenser coil where it gives up some of its

heat. The condenser fan moving air across the coil’s nned

surface facilitates the transfer of heat from the refrigerant to

the relatively cooler outdoor air.

When a sufcient quantity of heat has been removed from

the refrigerant gas (vapor), the refrigerant will “condense”

(i.e. change to a liquid). Once the refrigerant has been

condensed (changed) to a liquid it is cooled even further by

the air that continues to ow across the condenser coil.

The RAC design determines at exactly what point (in the

condenser) the change of state (i.e. gas to a liquid) takes

place. In all cases, however, the refrigerant must be

totally condensed (changed) to a Liquid before leaving the

condenser coil.

The refrigerant leaves the condenser Coil through the liquid

line as a warm high pressure liquid. It next will pass through

the refrigerant drier (if so equipped). It is the function of the

drier to trap any moisture present in the system, contaminants,

and large particulate matter.

The liquid refrigerant next enters the metering device. The

metering device is a capillary tube. The purpose of the

metering device is to “meter” (i.e. control or measure) the

quantity of refrigerant entering the evaporator coil.

In the case of the capillary tube this is accomplished (by

design) through size (and length) of device, and the pressure

difference present across the device.

Since the evaporator coil is under a lower pressure (due to

the suction created by the compressor) than the liquid line,

the liquid refrigerant leaves the metering device entering the

evaporator coil. As it enters the evaporator coil, the larger

area and lower pressure allows the refrigerant to expand

and lower its temperature (heat intensity). This expansion is

often referred to as “boiling”. Since the unit’s blower is moving

indoor air across the nned surface of the evaporator coil,

the expanding refrigerant absorbs some of that heat. This

results in a lowering of the indoor air temperature, hence the

“cooling” effect.

The expansion and absorbing of heat cause the liquid

refrigerant to evaporate (i.e. change to a gas). Once the

refrigerant has been evaporated (changed to a gas), it is

heated even further by the air that continues to ow across

the evaporator coil.

The particular system design determines at exactly what

point (in the evaporator) the change of state (i.e. liquid to a

gas) takes place. In all cases, however, the refrigerant must

be totally evaporated (changed) to a gas before leaving the

evaporator coil.

The low pressure (suction) created by the compressor

causes the refrigerant to leave the evaporator through the

suction line as a cool low pressure vapor. The refrigerant then

returns to the compressor, where the cycle is repeated.

REFRIGERATION SYSTEM SEQUENCE OF OPERATION

Refrigerant Charging

NOTE: Because The RAC System Is A Sealed System,

Service Process Tubes Will Have To Be Installed. First

Install A Line Tap And Remove Refrigerant From System.

Make Necessary Sealed System Repairs And Vacuum

System. Crimp Process Tube Line And Solder End Shut.

Do Not Leave A Service Valve In The Sealed System.

Proper refrigerant charge is essential to proper unit

operation. Operating a unit with an improper refrigerant

charge will result in reduced performance (capacity) and/or

efciency. Accordingly, the use of proper charging methods

during servicing will insure that the unit is functioning as

designed and that its compressor will not be damaged.

Too much refrigerant (overcharge) in the system is just as bad

(if not worse) than not enough refrigerant (undercharge). They

both can be the source of certain compressor failures if they

remain uncorrected for any period of time. Quite often, other

problems (such as low air ow across evaporator, etc.) are

misdiagnosed as refrigerant charge problems. The refrigerant

circuit diagnosis chart will assist you in properly diagnosing

these systems.

An overcharged unit will at times return liquid refrigerant

(slugging) back to the suction side of the compressor eventually

causing a mechanical failure within the compressor. This

mechanical failure can manifest itself as valve failure, bearing

failure, and/or other mechanical failure. The specic type of

failure will be inuenced by the amount of liquid being returned,

and the length of time the slugging continues.

Not enough refrigerant (undercharge) on the other hand, will

cause the temperature of the suction gas to increase to the point

where it does not provide sufcient cooling for the compressor

motor. When this occurs, the motor winding temperature will

increase causing the motor to overheat and possibly cycle open

the compressor overload protector. Continued overheating of

the motor windings and/or cycling of the overload will eventually

lead to compressor motor or overload failure.

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

RISK OF ELECTRIC SHOCK

HIGH PRESSURE HAZARD

SEALED REFRIGERATION SYSTEM REPAIRS

ANY SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

ALSO, ANY SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.

IMPORTANT

EQUIPMENT REQUIRED:

1. Voltmeter

2. Ammeter

3. Ohmmeter

4. E.P.A. Approved Refrigerant Recovery System

5. Vacuum Pump (capable of 200 microns or less

vacuum.)

6. Acetylene Welder

7. Electronic Halogen Leak Detector (G.E. Type H-6 or

equivalent.)

8. Accurate refrigerant charge measuring device such

as:

a. Balance Scales - 1/2 oz. accuracy

b. Charging Board - 1/2 oz. accuracy

9. High Pressure Gauge - (0 - 400 lbs.)

10. Low Pressure Gauge - (30 - 150 lbs.)

11. Vacuum Gauge - (0 - 1000 microns)

EQUIPMENT MUST BE CAPABLE OF:

1. Recovery CFC’s as low as 5%.

2. Evacuation from both the high side and low side of the

system simultaneously.

3. Introducing refrigerant charge into high side of the

system.

4. Accurately weighing the refrigerant charge actually

introduced into the system.

5. Facilities for owing nitrogen through refrigeration tubing

during all brazing processes.

3. Install a process tube to sealed system.

4. Make necessary repairs to system.

5. Evacuate system to 200 microns or less.

6. Weigh in refrigerant with the property quantity of R-22

refrigerant.

7. Start unit, and verify performance.

8. Crimp the process tube and solder the end shut.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with liquid refrigerant.

Failure to follow these procedures could

result in minor to moderate injury.

WARNING

CAUTION

BURN HAZARD

FREEZE HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

WARNING

BURN HAZARD

Method Of Charging / Repairs

The acceptable method for charging the RAC system is the

Weighed in Charge Method. The weighed in charge method is

applicable to all units. It is the preferred method to use, as it is

the most accurate.

The weighed in method should always be used whenever

a charge is removed from a unit such as for a leak repair,

compressor replacement, or when there is no refrigerant

charge left in the unit. To charge by this method, requires the

following steps:

1. Install a piercing valve to remove refrigerant from the

sealedsystem. (Piercing valve must be removed from the

system before recharging.)

2. Recover Refrigerant in accordance with EPA regulations.

Undercharged Refrigerant Systems

An undercharged system will result in poor performance

(low pressures, etc.) in both the heating and cooling

cycle.

Whenever you service a unit with an undercharge of

refrigerant, always suspect a leak. The leak must be

repaired before charging the unit.

To check for an undercharged system, turn the unit on,

allow the compressor to run long enough to establish

working pressures in the system (15 to 20 minutes).

During the cooling cycle you can listen carefully at the exit

of the metering device into the evaporator; an intermittent

hissing and gurgling sound indicates a low refrigerant

charge. Intermittent frosting and thawing of the evaporator

is another indication of a low charge, however, frosting

and thawing can also be caused by insufcient air over

the evaporator.

Checks for an undercharged system can be made at

the compressor. If the compressor seems quieter than

normal, it is an indication of a low refrigerant charge.

Overcharged Refrigerant Systems

A check of the amperage drawn by the compressor

motor should show a lower reading. (Check the Unit

Specication.) After the unit has run 10 to 15 minutes,

check the gauge pressures. Gauges connected to system

with an undercharge will have low head pressures and

substantially low suction pressures.

of the evaporator will not be encountered because the

refrigerant will boil later if at all. Gauges connected to

system will usually have higher head pressure (depending

upon amount of over charge). Suction pressure should be

slightly higher.

Compressor amps will be near normal or higher.

Noncondensables can also cause these symptoms. To

conrm, remove some of the charge, if conditions improve,

system may be overcharged. If conditions don’t improve,

Noncondensables are indicated.

Whenever an overcharged system is indicated, always

make sure that the problem is not caused by air ow

problems. Improper air ow over the evaporator coil may

indicate some of the same symptoms as an over charged

system.

An overcharge can cause the compressor to fail, since it

would be “slugged” with liquid refrigerant.

The charge for any system is critical. When the compressor

is noisy, suspect an overcharge, when you are sure that

the air quantity over the evaporator coil is correct. Icing

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation.

Extreme care must be used, if it becomes

necessary to work on equipment with power

applied.

Failure to do so could result in serious injury or

death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Restricted Refrigerant System

Troubleshooting a restricted refrigerant system can be

difcult. The following procedures are the more common

problems and solutions to these problems. There are two

types of refrigerant restrictions: Partial restrictions and

complete restrictions.

A partial restriction allows some of the refrigerant to

circulate through the system.

With a complete restriction there is no circulation of

refrigerant in the system.

Restricted refrigerant systems display the same symptoms

as a “low-charge condition.”

When the unit is shut off, the gauges may equalize very

slowly.

Gauges connected to a completely restricted system will

run in a deep vacuum. When the unit is shut off, the gauges

will not equalize at all.

A quick check for either condition begins at the evaporator.

With a partial restriction, there may be gurgling sounds

at the metering device entrance to the evaporator. The

evaporator in a partial restriction could be partially frosted

or have an ice ball close to the entrance of the metering

device. Frost may continue on the suction line back to the

compressor.

Often a partial restriction of any type can be found by feel,

as there is a temperature difference from one side of the

restriction to the other.

With a complete restriction, there will be no sound at the

metering device entrance. An amperage check of the

compressor with a partial restriction may show normal

current when compared to the unit speci cation. With a

complete restriction the current drawn may be considerably

less than normal, as the compressor is running in a deep

vacuum (no load.) Much of the area of the condenser will

be relatively cool since most or all of the liquid refrigerant

will be stored there.

The following conditions are based primarily on a system

in the cooling mode.

METERING DEVICE

Capillary Tube Systems

All units are equipped with capillary tube metering

devices.

Checking for restricted capillary tubes.

1. Connect pressure gauges to unit.

2. Start the unit in the cooling mode. If after a few minutes

of operation the pressures are normal, the check valve

and the cooling capillary are not restricted.

3. Switch the unit to the heating mode and observe

the gauge readings after a few minutes running time.

If the system pressure is lower than normal, the heating

capillary is restricted.

4. If the operating pressures are lower than normal in

both the heating and cooling mode, the cooling

capillary is restricted.

Locked Rotor Voltage (L.R.V.) Test

Locked rotor voltage (L.R.V.) is the actual voltage available

at the compressor under a stalled condition.

Single Phase Connections

Disconnect power from unit. Using a voltmeter, attach one

lead of the meter to the run “R” terminal on the compressor

and the other lead to the common “C” terminal of the com-

pressor. Restore power to unit.

Determine L.R.V.

Start the compressor with the volt meter attached; then stop

the unit. Attempt to restart the compressor within a couple

of seconds and immediately read the voltage on the meter.

The compressor under these conditions will not start and will

usually kick out on overload within a few seconds since the

pressures in the system will not have had time to equalize.

Voltage should be at or above minimum voltage of 197 VAC,

as specied on the rating plate. If less than minimum, check

for cause of inadequate power supply; i.e., incorrect wire

size, loose electrical connections, etc.

COMPRESSOR CHECKS

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment with

power applied.

Failure to do so could result in serious injury or

death.

Amperage (L.R.A.) Test

The running amperage of the compressor is the most impor-

tant of these readings. A running amperage higher than that

indicated in the performance data indicates that a problem

exists mechanically or electrically.

Single Phase Running and L.R.A. Test

NOTE: Consult the specication and performance section

for running amperage. The L.R.A. can also be found on the

rating plate.

Select the proper amperage scale and clamp the meter

probe around the wire to the “C” terminal of the compres-

sor. Turn on the unit and read the running amperage on

the meter. If the compressor does not start, the reading

will indicate the locked rotor amperage (L.R.A.).

External Overload

The compressor is equipped with an external overload

which senses both motor amperage and winding tem-

perature. High motor temperature or amperage heats the

overload causing it to open, breaking the common circuit

within the compressor.

Heat generated within the compressor shell, usually due

to recycling of the motor, is slow to dissipate. It may take

anywhere from a few minutes to several hours for the

overload to reset.

Checking the External Overload

With power off, remove the leads from compressor termi-

nals. If the compressor is hot, allow the overload to cool

before starting check. Using an ohmmeter, test continu-

ity across the terminals of the external overload. If you

do not have continuity; this indicates that the overload is

open and must be replaced.

Certain unit components operate at

temperatures hot enough to cause burns.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

Failure to follow this warning could result

in moderate to serious injury.

WARNING

BURN HAZARD

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

Failure to do so could result in serious injury or

death.

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Friedrich CP24N30 Owner's manual

Brand: Friedrich

Model: CP24N30

Category: Split-system air conditioners

Type: Owner's manual

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Friedrich CP24N30 Owner's manual

Friedrich CP24N30 Owner's manual

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