Friedrich CP18N30, CP24N30, CP14N10 User Manual

Service & P arts 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 Identiﬁ cation ................................................................................................................................................... 4

Installation Dimensions ................................................................................................................................................................5

Wiring Diagrams ...........................................................................................................................................................................6

Functional Component Deﬁ nitions ...............................................................................................................................................7

Refrigeration System Sequence of Operation ............................................................................................................................8

Sealed Refrigeration System Repairs ....................................................................................................................................9-12

T roubleshooting .....................................................................................................................................................................13-18

Part Diagrams and Part Lists ................................................................................................................................................19-23

Warranty ..................................................................................................................................................................................... 24

The information contained in t his manual is intended for use by a qualiﬁ ed ser vice technician who is familiar

with the safety procedures required i n in stal la tion a nd repair, and who is equipped with the proper tools and test instruments.

Installation or repairs made by unqualiﬁ ed persons can result in hazards subjecting the unqualiﬁ ed person making such repai rs 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 injur y or proper t y damage which may result to you or others. Friedrich Air Conditioning Co mpany will not be responsible for any injury or property damage arising from improper installation, service, and/or service procedures.

Speciﬁ cations 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 ﬂ ow fan – 1 Centrifugal ﬂ ow fan – 1 Centrifugal ﬂ ow fan – 1

Diameter-Length (inch) φ7.93 X 4.31 φ7.93 X 4.31 φ8.82 X 4.31

Indoor Side

Outdoor Side

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

Evaporator Aluminum ﬁ n-copper tube Aluminum ﬁ n-copper tube Aluminum ﬁ n-copper tube

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

Overload Protector MRA13425-12007 MRA98982-9200 Built in

Working Temp Range (ºF) 50º-115º 50º-115º 50º-115º

Condenser Aluminum ﬁ n-copper tube Aluminum ﬁ n-copper tube Aluminum ﬁ n-copper tube

Fan Type-Piece Axial fan –1 Axial fan –1 Axial fan –1

Fan Diameter (inch) φ15.59 φ15.59 φ15.59

Performance Data

PERFORMANCE

DATA * Cooling

CP14N10

CP18N30

CP24N30

EVAP. AIR TEMP.

DEG. F

Discharge

Air

59 21 118 173 56 41 54 78 267 12.1 / 58 26.5 115 15 58 22 119 173 66 52 55 77 269 8.3 / 57 23 119 172 66 52 55 77 269 8.5 / 208 57 23 117 197 60 44 50 75 264 12.3 / 56 24 117 195 57 44 50 75 264 13.1 / 208

Temp.

Drop F.

CONDENSER

TEMPERATURE

DEG. F

Discharge

Temp

Suction

Temp

Super

Heat

Sub-Cooling

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

OPERATING PRESSURES

Suction Discharge

ELECTRICAL RATING S R-22 REF.

Amps

Cool

Heat

Locked

Rotor Amps

38.9/42.4 27.9

56A(230V) 33.5

Charge in

OZ.

Voltage

230

BREAKER

FUSE

60 Hertz

Amps

Outer Component Identiﬁ cati o n

Models: CP14N10, CP18N30, CP24N30

Front intake grille

Cabinet

Air inlet louver

Front grille

Air filter (behind front intake grille)

Power cord

Control panel cover

Installation Dimensions

Models: CP14N10, CP18N30, CP24N30

(Top View)

Over 2'

Fence / obstruction

16.85"

Over 1'

(Front View)

25.98"

Over 1'

Wall Or window

Ceiling

Over 1'

(Side View)

Over 1'

Less than

8.66"

Over 2'

Wiring Diagrams

CP24N30

CP18N30 / CP14N10

Functional Component Deﬁ nitions

MECHANICAL C OMPONEN TS

Vent d o o r 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 airﬂ ow. 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 t he base pan and onto the condenser coil, thus lowering the temperature and pressures within the coil.

ELECTRICAL COMPONENTS

Thermostat Used to maintain the speciﬁ ed 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 W hen engaged, it sends the power sup ply to the fan motor through t he thermost at, which allows for a cycle-fan operation.

Fan Motor Dual- shaf ted fan motor operate s 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 A pressure-operated device used to direct the ﬂ ow

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 ﬂ ow of refrigerant to the heat exchangers (coils.)

Refrigeration System Sequence of Operation

A good understanding of t he basic operation of the refrigera tion system is essential for the s ervic e technician. Without t his understanding, accurate troubleshooting of refrigeration system problems will be more difﬁ cult and time consuming, if not (in some cases) entirely impossible. The re frigeration system uses four basic principles (laws) in its operation they are as follows:

1. “Heat always ﬂ 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 w hich a liquid or gas c hanges state is dependent upon the pressure.”

The refrigerat ion cycle begins at the compre ssor. Starting the

compressor creates a low pressure in the suction line which draws refrigerant gas (vapor) into the compressor. The compressor then

“compresse s” this refrigerant, raising it s pressure and its (heat

intensity) T emperature.

The refrigerant leaves the compressor through the discharge line

as a hot high pressure gas (vapor). The refrigerant enter s the condenser coil where it gives up some of its heat. The condenser fan moving air across the coil’s ﬁ nned surface facilitates the transfer of heat from the refrigerant to the relatively cooler outdoor air.

When a sufﬁ cient quantity of heat has be en 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 ﬂ ow across the condenser 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 co il is under a lower p res sure (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 ﬁ 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 ﬂ 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 compre ssor caus es

the refrigerant to le ave the evaporator through t he suctio n line as a cool low pressure vapor . The refrigerant then returns to the compressor, where the cycle is repeated.

Refrigerant System Components

The RAC design determines at exactly what point (in the condenser)

the change of state (i.e. gas to a liquid) takes plac e. In all cas es, 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 nex t enters the metering device. The

metering device is a capillary tube. The purpose of the metering device is to “meter ” (i.e. control or me asure) th e quantity of refrigerant entering the evaporator coil.

Suction Line

Evaporator Coil

Metering Device

Refrigerant Dryer

Discharge Line

Condenser Coil

Compressor

Refrigerant Drier

Liquid

Line

Sealed Refrigeration System Repairs

IMPORTANT

ANY SEALED SYSTEM REPAIRS TO COOL -ONLY MODELS REQUIRE THE INST ALLATION 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. V acuum Pump ( capable of 200 microns or less vacuum. )

6. Acetylene Welder

7. Electronic H alogen 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.)

1 0. 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 ﬂ owing nitrogen throu gh refriger ation tubing during all brazing processes.

HERMETIC COMPONENT REP LAC EMEN T

The following proc edure applies when replacing component s in the sealed refrig eration circuit or repairing ref rigerant leaks. (Compressor, condenser, evaporator, capillary tub e, refrigerant

leaks, etc.)

1. Recover the refr igerant from the system at the proc ess tube located on the high side of the system by installing a line tap on the proc ess tube. App ly gauge from pr ocess tube to EP A ap pro v ed gauges from process tube to E PA 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 nitr ogen tank to the suction process tube.

4. Dr ift dry ni trogen through the system and un- solder the more distant connection ﬁ rst. (Filter drier, high side process tube, etc.)

5. Replace inoperative component, and always install a new ﬁ lter drier. Drift dr y nitrogen through the system when making these connections.

HERMETIC COMPONENT REP LAC EMEN T cont’d

6. Pressurize system to 30 PSIG with proper refrigerant and boost refrigerant pressure to 1 50 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 c op per tubin g. (Do n ot use regular hoses.)

1 0. Evacuate system to maximum absolute holding pressure

of 200 micro ns or less. NOTE: This process c an 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 speciﬁ ed. This will prevent boiling the oil out of the crankcas e, 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 PROCE DURE IN THE CASE OF COM PRESSOR MOTOR BURNOUT

1. Recover all refrigerant and oil from the system.

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

3. Flush evaporator condenser and all connecting tubing with dry nitro gen 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 drie r str ainer and capil l a ry t u b e .

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

ROTA RY COMPRESSOR SPECIAL TROUBLESHOOTING AND SERVICE

Basically, troubleshooting and ser vicing rotary c ompressors 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.

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