Friedrich CP14-18-24 CP14N10 User Manual

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Service & Parts Manual 2007

Compact Programmable

Models

CP14N10

CP18N30

CP24N30

CP-14-18-24-Svc-Prts-07(3-07)

Table of Contents

 

Performance Data........................................................................................................................................................................

3

Outer Component Identification...................................................................................................................................................

4

Installation Dimensions ................................................................................................................................................................

5

Wiring Diagrams...........................................................................................................................................................................

6

Functional Component Definitions ...............................................................................................................................................

7

Refrigeration System Sequence of Operation ............................................................................................................................

8

Sealed Refrigeration System Repairs ....................................................................................................................................

9-12

Troubleshooting .....................................................................................................................................................................

13-18

Part Diagrams and Part Lists................................................................................................................................................

19-23

Warranty .....................................................................................................................................................................................

24

The information contained in this manual is intended for use by a qualified service technician who is familiar with the safety procedures required in installation and repair, and who is equipped with the proper tools and test instruments.

Installation or repairs made by unqualified persons can result in hazards subjecting the unqualified person making such repairs to the risk of injury or electrical shock which can be serious or even fatal not only to them, but also to persons being served by the equipment.

If you install or perform service on equipment, you must assume responsibility for any bodily injury or property damage which may result to you or others. Friedrich Air Conditioning Company will not be responsible for any injury or property damage arising from improper installation, service, and/or service procedures.

2

Specifications and Technical Parameters

Model

 

CP14N10

CP18N30

CP24N30

Function

 

COOLING

COOLING

COOLING

Rated Voltage

 

115V ~

230/208V~

230/208V~

Rated Frequency

 

60Hz

60Hz

60Hz

Total Capacity (Btu/h)

14000

18000/17600

23500/23100

Power Input (W)

 

1430

1850/1810

2740/2710

Rated Input (W)

 

1540

2478

3538

Rated Current (A)

 

15

12.57

18.09

Air Flow Volume (CFM) (H)

458.8

458.8

617.6

Dehumidifying Volume (pints/h)

3.38

4.65

8.46

EER / C.O.P BTU/W.H)

9.8

9.7/9.7

8.6/8.5

Energy Class

 

/

/

/

 

Fan Type-Piece

Centrifugal flow fan – 1

Centrifugal flow fan – 1

Centrifugal flow fan – 1

 

Diameter-Length(inch)

φ7.93 X 4.31

φ7.93 X 4.31

φ8.82 X 4.31

Indoor Side

Evaporator

Aluminum fin-coppertube

Aluminum fin-coppertube

Aluminum fin-coppertube

 

Pipe Diameter (inch)

φ0.276

φ0.276

φ0.276

 

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

 

Compressor Type

ROTARY

ROTARY

ROTARY

 

L.R.A. (A)

58

42

56

 

Compressor RLA(A)

10.9

7.45

11.7/11.0

 

Compressor Power Input(W)

1182

1700

2425/2480

Outdoor Side

Overload Protector

MRA13425-12007

MRA98982-9200

Built in

 

Working Temp Range (ºF)

50º-115º

50º-115º

50º-115º

 

Condenser

Aluminum fin-coppertube

Aluminum fin-coppertube

Aluminum fin-coppertube

 

Fan Type-Piece

Axial fan –1

Axial fan –1

Axial fan –1

 

Fan Diameter (inch)

φ15.59

φ15.59

φ15.59

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

900/780/730

900/780/730

1000/900/800

Output of Fan Motor (W)

200

200

190

Fan Motor RLA(A)

 

3

1.45

1.35

Fan Motor Capacitor (uF)

15 MFD

7 MFD

7 MFD

Permissible Excessive Operating Pressure for the Discharge Side (Psig)

300

300

300

Permissible Excessive Operating Pressure for the Suction Side (Psig)

150

150

150

Dimension (H/W/D)( inch)

16.85 x 25.98 x 28.46

16.85 x 25.98 x 28.46

16.85 x 25.98 x 29.29

Dimension of Package (H/W/D)( inch)

19.96 x 31.1 x 29.13

19.96 x 31.1 x 29.13

19.69 x 29.29 x 36.22

Net Weight /Gross Weight (Pounds)

150/163

150/163

165/183

Refrigerant Charge (Ounce)

R22/26.46

R22/27.87

R22/33.51

Performance Data

 

EVAP. AIR TEMP.

CONDENSER

 

 

 

 

OPERATING

ELECTRICAL RATINGS

R-22REF.

 

BREAKER

PERFORMANCE

 

DEG. F

Discharge

Suction

Super

 

PRESSURES

 

FUSE

 

 

 

 

 

 

 

 

 

 

TEMPERATURE

Sub-Cooling

 

 

 

 

 

 

Voltage

 

DATA* Cooling

Discharge

Temp.

DEG. F

Temp

Temp

Heat

 

Suction

Discharge

Amps

Amps

Locked

Charge in

 

60 Hertz

 

Air

 

Drop F.

 

 

 

 

 

Cool

Heat

Rotor Amps

OZ.

 

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

15

57

 

23

119

172

66

52

55

77

269

8.5

/

208

 

 

 

 

 

CP24N30

57

 

23

117

197

60

44

50

75

264

12.3

/

56A(230V)

33.5

230

20

56

 

24

117

195

57

44

50

75

264

13.1

/

208

 

 

 

 

 

*Rating Conditions:

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

 

 

 

3

Outer Component Identification

Models: CP14N10, CP18N30, CP24N30

Cabinet

Air inlet louver

Front grille

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Front intake grille

 

 

Air filter

Power cord

(behind front intake grille)

 

 

 

 

 

Control panel cover

4

Installation Dimensions

Models: CP14N10, CP18N30, CP24N30

 

(Top View)

 

 

 

Fence / obstruction

Over 2'

 

 

Over

Over

 

1'

1'

 

 

Wall Or window

 

(Front View)

Ceiling

(Side View)

 

 

25.98"

Over 1'

Over 1'

16.85"

 

 

 

 

Over 2'

 

 

Less than

 

 

8.66"

5

Wiring Diagrams

CP24N30

CP18N30 / CP14N10

6

Functional Component Definitions

MECHANICAL COMPONENTS

Vent door Allows introduction of fresh air into the room and/or exhausts stale room air outside (on select models.)

Plenum assembly Diffuser with directional louvers used to direct the conditioned airflow.

Blower wheel Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air though 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.

ELECTRICAL COMPONENTS

Thermostat Used to maintain the specified room side comfort level

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

MoneySaver® switch When engaged, it sends the power supply to the fan motor through the thermostat, which allows for acycle-fanoperation.

Fan Motor Dual-shaftedfan motor operates the indoor blower wheel and the condenser fan blade simultaneously.

Heat anticipator Used to provide better thermostat and room air temperature control.

HERMETIC COMPONENTS

Compressor Motorized device used to compress refrigerant through the sealed system.

Check valve Apressure-operateddevice used to direct the flow of refrigerant to the proper capillary tube, during either the heating or cooling cycle.

Capillary tube A cylindrical meter device used to evenly distribute the flow of refrigerant to the heat exchangers (coils.)

7

Refrigeration System Sequence of Operation

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 difficult 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 flows 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 finned surface facilitates the transfer of heat from the refrigerant to the relatively cooler outdoor air.

When a sufficient 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 flow 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 finned 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 flow 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.

Refrigerant System Components

Suction

Discharge

Line

Line

Evaporator

Condenser

Coil

Coil

 

Compressor

Metering

Refrigerant Drier

Device

Liquid

Refrigerant

Line

Dryer

 

8

Sealed Refrigeration System Repairs

IMPORTANT

ANY SEALED SYSTEM REPAIRS TO COOL-ONLYMODELS 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.

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-6or 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 flowing nitrogen through refrigeration tubing during all brazing processes.

HERMETIC COMPONENT REPLACEMENT

The following procedure applies when replacing components in the sealed refrigeration circuit or repairing refrigerant leaks. (Compressor, condenser, evaporator, capillary tube, refrigerant leaks, etc.)

1.Recover the refrigerant from the system at the process tube located on the high side of the system by installing a line tap on the process tube. Apply gauge from process tube to EPA approved gauges from process tube to EPA approved recovery system. Recover CFC’s in system to at least 5%.

2.Cut the process tube below pinch off on the suction side of the compressor.

3.Connect the line from the nitrogen tank to the suction process tube.

HERMETIC COMPONENT REPLACEMENT cont’d

6.Pressurizesystemto30PSIGwithproperrefrigerantandboost refrigerant pressure to 150 PSIG with dry nitrogen.

7.Leak test complete system with electric halogen leak detector, correcting any leaks found.

8.Reduce the system to zero gauge pressure.

9.Connect vacuum pump to high side and low side of system with deep vacuum hoses, or copper tubing. (Do not use regular hoses.)

10.Evacuate system to maximum absolute holding pressure of 200 microns or less. NOTE: This process can be accelerated by use of heat lamps, or by breaking the vacuum with refrigerant or dry nitrogen at 5,000 microns. Pressure system to 5 PSIG and leave in system a minimum of 10 minutes. Release refrigerant, and proceed with evacuation of a pressure of 200 microns or less.

11.Break vacuum by charging system from the high side with the correct amount of liquid refrigerant specified. This will prevent boiling the oil out of the crankcase, and damage to the compressor due to over heating.

NOTE: If the entire charge will not enter the high side, allow the remainder to enter the low side in small increments while operating the unit.

12.Restart unit several times after allowing pressures to stabilize. Pinch off process tubes, cut and solder the ends. Remove pinch off tool, and leak check the process tube ends.

SPECIAL PROCEDURE IN THE CASE OF COMPRESSOR MOTOR BURNOUT

1.Recover all refrigerant and oil from the system.

2.Remove compressor, capillary tube and filter drier from the system.

3.Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent, to remove all contamination from system. Inspect suction and discharge line for carbon deposits. Remove and clean if necessary.

4.Reassemble the system, including new drier strainer and capillary tube.

5.Proceed with processing as outlined under hermetic component replacement.

ROTARY COMPRESSOR SPECIAL TROUBLESHOOTING AND SERVICE

4.Drift dry nitrogen through the system and un-solderthe more distant connection first. (Filter drier, high side process tube, etc.)

5.Replace inoperative component, and always install a new filter drier. Drift dry nitrogen through the system when making these connections.

Basically, troubleshooting and servicing rotary compressors is the same as on the reciprocating compressor with only one main exception:

NEVER, under any circumstances, charge a rotary compressor through the LOW side. Doing so would cause permanent damage to the new compressor.

9

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 efficiency. 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 flow 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 specific type of failure will be influenced 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 sufficient 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.

METHOD OF CHARGING

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 sealed system. (Piercing valve must be removed from the system before recharging.)

2.Recover Refrigerant in accordance with EPA regulations.

3.Install a process tube to sealed system.

4.Make necessary repairs to system.

5.Evacuate system to 250 - 300 microns or less.

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

7.Start unit, and verify performance.

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

NOTE: In order to access the sealed system it will be necessary to install Schrader type fittings to the process tubes on the discharge and suction of the compressor. Proper refrigerant recovery procedures need to be adhered to as outlined in EPA Regulations. THIS SHOULD ONLY BE ATTEMPTED BY QUALIFIED SERVICE PERSONNEL.

10