Friedrich Air Conditioner KM21J30 User Manual

1998

QuietMaster^®J Series

KS10J10

KS12J10

KS12J30A

KM18J30A

KM21J30

KL25J30

Service & Parts

Manual

AMERICA’S BEST AIR CONDITIONER

RAC-K (1/98)

Page 1

FRIEDRICH ROOM MODEL NUMBER CODE

1st DIGIT - FUNCTION

S = Straight Cool, Value Series

C = Straight Cool, Budget Series

Y = Heat Pump

E = Electric Strip

K = Straight Cool, Challenger or QuietMaster Series

W =Thru-The-Wall, WallMaster Series

2nd DIGIT - TYPE

C = Casement

P = PowerMiser “Portable”

Q = QStar, KStar orYQ TwinTemp

S = Small Chassis

M = Medium Chassis

L = Large Chassis

W = Built-In

H = Hazardgard

3rd & 4th DIGITS - APPROXIMATE BTU/HR (Cooling)

Heating BTU/HR capacity listed in Specifications/Performance Data Section

5th DIGIT - ALPHABETICAL MODIFIER

6th DIGIT - VOLTAGE

1 = 115 Volts

2 = 230 Volts

3 = 230-208 Volts

7th DIGIT

0 = Straight Cool & Heat Pump Models

ELECTRIC HEAT MODELS

1 = 1 KW Heat Strip, Nominal

3 = 3 KW Heat Strip, Nominal

4 = 4 KW Heat Strip, Nominal

5 = 5 KW Heat Strip, Nominal

8 = 8 KW Heat Strip, Nominal

8th DIGIT

Major Change

Page 3

APPLICATION AND SIZING

In the application and sizing of room air conditioners for cooling, it is most important to give full consideration to all

factors which may contribute to the heat loss or gain of the space to be conditioned.It is therefore necessary to make

a survey of the space to be conditioned and calculate the load requirements before a selection of the size of the

equipment needed can be made.

The load requirement may be determined very easily by simply using the standard “AHAM” Load Calculating Form,

on Page 6.This form is very easy to use and is self explanatory throughout. It is necessary only to insert the proper

measurements on the lines provided and multiply by the given factors, then add the result for the total load require-

ments.

Cooling load requirements are generally based on the cooling load for comfortable air conditioning which does not

require specific conditions of inside temperature and humidity.The load calculation form is based on outside design

temperature of 95° FDB and 75° FWB. It can be used for areas in the Continental United States having other outside

design temperatures by applying a correction factor for the particular locality as determined from the map shown on

Page 6.

When sizing a TwinTemp unit for cooling and heating, we must remember that the heating capacity of any given unit

varies directly with the outdoor ambient temperature.Also, we must keep in mind the average low temperatures which

might be experienced in the locality where the unit is to be installed. Therefore, when sizing a TwinTemp unit, both

cooling and heating requirements must be calculated. Do not oversize, or undersize, one phase of the unit’s capacity

at the expense of the other. In those cases where the unit will provide satisfactory cooling at all times but will be

inadequate for those few times that the outdoor temperature is below the maximum low for the unit, additional auxil-

iary heating facilities must be provided to insure that adequate heat is available at all times.

Page 4

INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE

FORM FOR ROOM AIR CONDITIONERS

(AHAM PUB. NO. RAC-1)

A. This cooling load estimate form is suitable for estimating the cooling load for comfort air conditioning installations

which do not require specific conditions of inside temperature and humidity.

B. The form is based on an outside design temperature of 95°F dry bulb and 75°F wet bulb.It can be used for areas

in the continental United States having other outside design temperatures by applying a correction factor for the

particular locality as determined from the map.

C. The form includes“day”factors for calculating cooling loads in rooms where daytime comfort is desired (such as

living rooms, offices, etc.)

D. The numbers of the following paragraphs refer to the corresponding numbered item on the form:

1. Multiply the square feet of window area for each exposure by the applicable factor.The window area is the

area of the wall opening in which the window is installed.For windows shaded by inside shades or venetian

blinds, use the factor for “Inside Shades.” For windows shaded by outside awnings or by both outside

awnings and inside shades (or venetian blinds), use the factor for “Outside Awnings.” “Single Glass” in-

cludes all types of single thickness windows, and “Double Glass” includes sealed airspace types, storm

windows, and glass block.Only one number should be entered in the right hand column for Item 1, and this

number should represent only the exposure with the largest load.

2. Multiply the total square feet of all windows in the room by the applicable factor.

3a. Multiply the total length (linear feet) of all walls exposed to the outside by the applicable factor.Doors should

be considered as being part of the wall. Outside walls facing due north should be calculated separately

from outside walls facing other directions. Walls which are permanently shaded by adjacent structures

should be considered “North Exposure.” Do not consider trees and shrubbery as providing permanent

shading. An uninsulated frame wall or a masonry wall 8 inches or less in thickness is considered “Light

Construction.”An insulated wall or masonry wall over 8 inches in thickness is considered“Heavy Construc-

tion.”

3b. Multiply the total length (linear feet) of all inside walls between the space to be conditioned and any uncon-

ditioned spaces by the given factor.Do not include inside walls which separate other air conditioned rooms.

4. Multiply the total square feet of roof or ceiling area by the factor given for the type of construction most

nearly describing the particular application (use one line only.)

5. Multiply the total square feet of floor area by the factor given.Disregard this item if the floor is directly on the

ground or over a basement.

6. Multiply the number of people who normally occupy the space to be air conditioned by the factor given.Use

a minimum of 2 people.

7. Determine the total number of watts for light and electrical equipment, except the air conditioner itself, that

will be in use when the room air conditioning is operating. Multiply the total wattage by the factor given.

8. Multiply the total width (linear feet) of any doors or arches which are continually open to an unconditioned

space by the applicable factor.

NOTE: Where the width of the doors or arches is more than 5 feet, the actual load may exceed the

calculated value.In such cases, both adjoining rooms should be considered as a single large room, and the

room air conditioner unit or units should be selected according to a calculation made on this new basis.

9. Total the loads estimated for the foregoing 8 items.

10. Multiply the subtotal obtained in item 9 by the proper correction factor, selected from the map, for the

particular locality.The result is the total estimated design cooling load in BTU per hour.

E. For best results, a room air conditioner unit or units having a cooling capacity rating (determined in accordance

with the NEMA Standards Publication for Room Air Conditioners, CN 1-1960) as close as possible to the esti-

mated load should be selected. In general, a greatly oversized unit which would operate intermittently will be

much less satisfactory than one which is slightly undersized and which would operate more nearly continuously.

Intermittent loads such as kitchen and laundry equipment are not included in this form.

Page 5

COOLING LOAD ESTIMATE FORM

Page 6

SPECIFICATIONS

KS10J10

KS12J10 KS12J30A KM18J30A

KM21J30

KL25J30A

BTUH

12500

18000

21000

20500

25000

24700

10000

12000

E.E.R.

10.0

9.6

9.0

8.3

8.2

10.3

115

9.1

9.5

115

10.8

Volts

230

208

230

208

230

208

230

208

Amperes

Total Watts

5.8

6.2

8.3

9.1

10.5

11.3

13.5

15.0

1250

1875

2335

2280

3010

970

1265

Hertz

Fuse/Breaker Size

Fan RPM

1115

325

1080

325

1180

325

1120

440

1120

535

1120

610

Evaporator Air CFM

Fresh Air CFM

Yes

Exhaust Air CFM

Dehumidification Pts/HR

Width

2.8

3.5

5.5

6.3

7.6

28"

25-15/16"

Height

Depth

15-15/16"

27-3/8"

15-15/16"

27-3/8"

15-15/16"

27-3/8"

17-15/16"

27-3/8"

17-15/16"

27-3/8"

20-3/16"

33-5/8"

Minimum Ext. Into Room

Minimum Ext. to Outside

3-1/16"

3-3/16"

16-15/16"

18-15/16"

Net Weight

108

118

111

121

111

121

136

148

183

203

190

210

ShippingWeight

PERFORMANCE

DATA*

EVAPORATOR AIR

TEMP. °F.

OPERATING

PRESSURES

ELECTRICAL

RATINGS

R-22

COMP.

OIL

REFRIG.

Cooling

DISCHARGE

TEMP.

SUCTION

DISCHARGE AMPS

LOCKED

CHARGE IN

OZ.

CHARGE IN

FLUID OZ.

AIR

DROP °F

ROTOR AMPS

KS10J10

KS12J10

KS12J30A

KM18J30A

KM21J30

KL25J30A

61.0

57.0

56.0

55.0

19.0

23.0

24.0

25.0

79.0

78.0

79.0

73.0

75.0

68.5

269

288

293

262

260

300

9.1

48.3

54.0

26.3

42.0

56.0

71.0

21.0

25.0

26.0

46.0

34.0

11.8

13.9

32.0

10.8

5.8

6.2

8.3

9.1

10.5

11.3

13.5

15.0

* Rating Conditions:

80°F. Room Air Temperature and 50% Relative Humidity with

95°F. Outside Air Temperature at 40% Relative Humidity.

Page 7

GROUND TEST

COMPONENTS OPERATION & TESTING

Use an ohmmeter set on its highest scale. Touch one

lead to the compressor body (clean point of contact as

a good connection is a must) and the other probe in

turn to each compressor terminal (see Figure 2.) If a

reading is obtained, the compressor is grounded and

must be replaced.

WARNING

DISCONNECT ELECTRICAL POWER TO

UNIT BEFORE SERVICING OR TESTING

COMPRESSORS

Figure 2: Typical Ground Test

Compressors are single phase, 15 or 230/208 volt, de-

pending on the model unit. All compressor motors are

permanent split capacitor type using only a running ca-

pacitor across the start and run terminal.

All compressors are internally spring mounted and ex-

ternally mounted on rubber isolators.

COMPRESSOR WINDING TEST (See Figure 1)

Remove compressor terminal box cover and disconnect

wires from terminals. Using an ohmmeter, check conti-

nuity across the following:

1. Terminal “C” and “S” - no continuity - open wind-

ing - replace compressor.

CHECKING COMPRESSOR EFFICIENCY

2. Terminal “C” and “R” - no continuity - open wind-

ing - replace compressor.

The reason for compressor inefficiency is normally due

to broken or damaged suction and/or discharge valves,

reducing the ability of the compressor to pump refriger-

ant gas.

3. Terminal “R” and “S” - no continuity - open wind-

ing - replace compressor.

This condition can be checked as follows:

1. Install a piercing valve on the suction and dis-

charge or liquid process tube.

Figure 1: Compressor Winding Test

2. Attach gauges to the high and low sides of the

system.

3. Start the system and run a “cooling or heating

performance test.”

If test shows:

A. Below normal high side pressure.

B. Above normal low side pressure.

C. Low temperature difference across coil.

The compressor valves are faulty - replace the

compressor.

THERMAL OVERLOAD (External)

Some compressors are equipped with an external over-

load which is located in the compressor terminal box

adjacent to the compressor body (see Figure 3.)

Page 8

The overload is wired in series with the common motor

terminal.The overload senses both major amperage and

compressor temperature. High motor temperature or

amperage heats the disc causing it to open and break

the circuit to the common motor terminal.

Should the internal temperature and/or current draw be-

come excessive, the contacts in the overload will open,

turning off the compressor. The overload will automati-

cally reset, but may require several hours before the heat

is dissipated.

CHECKING THE INTERNAL OVERLOAD

(see Figure 4.)

Figure 3: External Overload

Figure 4

Heat generated within the compressor shell is usually

due to:

1. With no power to unit, remove the leads from the

compressor terminals.

1. High amperage.

2. Using an ohmmeter, test continuity between ter-

minals C-S and C-R. If not continuous, the com-

pressor overload is open and the compressor must

be replaced.

2. Low refrigerant charge.

3. Frequent recycling.

4. Dirty condenser.

FAN MOTOR

A single phase permanent split capacitor motor is used

to drive the evaporator blower and condenser fan.

A self-resetting overload is located inside the mo-

tor to protect against high temperature and high

amperage conditions.

THERMAL OVERLOAD - TEST

(Compressor - External Type)

1. Remove overload.

FAN MOTOR - TEST

2. Allow time for overload to reset before attempting

to test.

1. Determine that capacitor is serviceable.

3. Apply ohmmeter probes to terminals on overload

wires.There should be continuity through the over-

load.

2. Disconnect fan motor wires from fan speed switch

or system switch.

3. Apply“live”test cord probes on black wire and com-

mon terminal of capacitor.Motor should run at high

speed.

TERMINAL OVERLOAD (Internal)

Some model compressors are equipped with an inter-

nal overload. The overload is embedded in the motor

windings to sense the winding temperature and/or cur-

rent draw.The overload is connected in series with the

common motor terminal.

4. Apply “live” test cord probes on red wire and com-

mon terminal of capacitor. Motor should run at low

speed.

Page 9

CAPACITOR - TEST

Figure 5: Fan Motor

1. Remove capacitor from unit.

2. Check for visual damage such as bulges, cracks,

or leaks.

3. For dual rated, apply an ohmmeter lead to com-

mon (C) terminal and the other probe to the com-

pressor (HERM) terminal.A satisfactory capacitor

will cause a deflection on the pointer, then gradu-

ally move back to infinity.

4. Reverse the leads of the probe and momentarily

touch the capacitor terminals.The deflection of the

pointer should be two times that of the first check if

the capacitor is good.

5. Apply “live” test cord probes on each of the re-

maining wires from the speed switch or system

switch to test intermediate speeds.

5. Repeat steps 3 and 4 to check fan motor capaci-

tor.

NOTE: A shorted capacitor will indicate a low resis-

tance and the pointer will move to the “0” end of

the scale and remain there as long as the probes

are connected.

CAPACITOR, RUN

A run capacitor is wired across the auxiliary and main

winding of a single phase permanent split capacitor

motor such as the compressor and fan motor. A single

capacitor can be used for each motor or a dual rated

capacitor can be used for both.

An open capacitor will show no movement of the

pointer when placed across the terminals of the

capacitor.

SYSTEM CONTROL SWITCH

The capacitor’s primary function is to reduce the line

current while greatly improving the torque characteris-

tics of a motor.The capacitor also reduces the line cur-

rent to the motor by improving the power factor of the

load.The line side of the capacitor is marked with a red

dot and is wired to the line side of the circuit (see Figure

6.)

A five position control switch is used to regulate the op-

eration of the fan motor and compressor.The compres-

sor can be operated with the fan operating at low, me-

dium or high speed.The fan motor can also be operated

independently on medium speed.See switch section as

indicated on decorative control panel (see Figure 7.)

SYSTEM CONTROL SWITCH - TEST

Figure 6: Run Capacitor Hook-Up

Disconnect leads from control switch (see Figure 8.)

There must be continuity as follows:

1. “Off” Position - no continuity between terminals.

2. “Lo Cool”Position - between terminals“L1” and“C”,

“LO” and “MS”.

3. “Med Cool” Position - between terminals “L1” and

“C”, “M” and “MS”.

4. “Hi Cool” Position - between terminals“L1” and“C”,

“H” and“MS”.

5. “Fan Only” Position - between terminals “L1” and

“2”.

Page 10

to supply a small amount of heat to the bulb area to

prevent long“off cycles” in the“Cool-Fan Auto” (Money-

Saver) position (see Figure 10.) A current feedback

through the fan motor windings during “off cycle” com-

pletes the circuit to the resistor.

Figure 7: System Control Panel

RANGE:

Cooling ModelThermostat

(Part No. 618-225-00)

60°F (± 2°) to 92°F (± 4°),

TEST:

Remove wires from thermostat. Turn the thermostat to

its coldest position. Check to see if there is continuity

between the two terminals. Turn the thermostat to its

warmest position. Check continuity to see if thermostat

contacts open.NOTE: Temperature must be within range

listed to check thermostat. Refer to the troubleshooting

section in this manual for additional information on ther-

mostat testing.

Figure 9:Thermostat

Figure 8: System Control Switch

THERMOSTAT

(Figure 9)

THERMOSTAT ADJUSTMENT

A cross ambient thermostat is used on all standard chas-

sis units. In addition to cycling the unit in a heating or

cooling operation, the thermostat will terminate the cool-

ing cycle in the event ice forms on the evaporator coil, in

this case the thermostat functions as a de-ice control.

A resistor (anticipator) is positioned within a plastic block

No attempt should be made to adjust thermostat. Due

to the sensitivity of the internal mechanism and the so-

phisticated equipment required to check the calibration,

it is suggested that the thermostat be replaced rather

than calibrated.

Page 11

RESISTOR

(Heat Anticipator)

FIGURE 11 ROCKER SWITCH

Failure of the resistor will cause prolonged“off” and“on”

cycles of the unit. When replacing a resistor, be sure

and use the exact replacement. Resistor ratings are as

follows:

115 Volt - 5,000 ohms 3 watt

230 Volt - 20,000 ohms 3 watt

Figure 10 RESISTOR

MONEYSAVER^®SWITCH

SEALED REFRIGERATION SYSTEM REPAIRS

EQUIPMENT REQUIRED

1. Voltmeter

(Rocker Switch) - (See Figure 11)

This rocker switch can be depressed to either YES or

NO. In the YES position you will get the most economi-

cal operation.Both the fan and compressor will cycle on

and off together, maintaining the selected temperature

at a more constant level and reducing the humidity more

efficiently.This control will only operate when the unit is

in a cooling mode. In the NO position, the fan will run

constantly as long as the unit is in the cooling mode.

2. Ammeter

3. Ohmmeter

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

5. Vacuum Pump (capable of 200 microns or less

vacuum.)

TEST:

Disconnect leads from switch. Depress switch to func-

tion being tested.

6. AcetyleneWelder

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

or equivalent.)

1. WhenYES is depressed, there should be continu-

ity between terminals “1” and “2”.

8. Accurate refrigerant charge measuring device such

as:

2. When NO is depressed, there should be continu-

ity between terminals “2” and “3”.

Page 12

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. Recovering CFCs as low as 5%.

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 pro-

cess can be speeded up 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 min-

utes.Recover refrigerant, and proceed with evacu-

ation of a pressure of 200 microns or a minimum

of 10 %.

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

the system simultaneously.

3. Introducing refrigerant charge into high side of the

system.

11. Break vacuum by charging system from the high

side with the correct amount of refrigerant speci-

fied.This will prevent boiling the oil out of the crank-

case.

4. Accurately weighing the refrigerant charge actually

introduced into the system.

5. Facilities for flowing nitrogen through refrigeration

tubing during all brazing processes.

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.

HERMETIC COMPONENT REPLACEMENT

12. Restart unit several times after allowing pressures

to stabilize. Pinch off process tubes, cut and sol-

der the ends. Remove pinch off tool, and leak

check the process tube ends.

The following procedure applies when replacing compo-

nents in the sealed refrigeration circuit or repairing re-

frigerant leaks.(Compressor, condenser, evaporator, cap-

illary tube, refrigerant leaks, etc.)

1. Recover the refrigerant from the system at the pro-

cess 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 CFCs in system to at least 5%.

SPECIAL PROCEDURE IN THE CASE OF

MOTOR COMPRESSOR BURNOUT

1. Recover all refrigerant and oil from the system.

2. Remove compressor, capillary tube and filter drier

from the system.

2. Cut the process tube below pinch off on the suc-

tion side of the compressor.

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.

3. Connect the line from the nitrogen tank to the suc-

tion process tube.

4. Drift dry nitrogen through the system and unsolder

the more distant connection first. (Filter drier, high

side process tube, etc.)

4. Reassemble the system, including new drier

strainer and capillary tube.

5. Replace inoperative component, and always install

a new filter drier.Drift dry nitrogen through the sys-

tem when making these connections.

5. Proceed with processing as outlined under her-

metic component replacement.

6. Pressurize system to 30 PSIG with proper refriger-

ant and boost refrigerant pressure to 150 PSIG with

dry nitrogen.

Page 13

ROTARY COMPRESSOR SPECIAL

TROUBLESHOOTING AND SERVICE

Basically, troubleshooting and servicing rotary compres-

sors is the same as on the reciprocating compressor

with only a few exceptions.

1. Because of the spinning motion of the rotary, the

mounts are critical. If vibration is present, check

the mounts carefully.

2. The electrical terminals on the rotary are in a dif-

ferent order than the reciprocating compressors.

The terminal markings are on the cover gasket.

Use your wiring diagram to insure correct con-

nections.

REFRIGERANT CHARGE

1. The refrigerant charge is extremely critical. Mea-

sure charge carefully - as exact as possible to the

nameplate charge.

2. The correct method for charging the rotary is to

introduce liquid refrigerant into the high side of

the system with the unit off.Then start compres-

sor and enter the balance of the charge, gas only,

into the low side.

The introduction of liquid into the low side, with-

out the use of a capillary tube, will cause damage

to the discharge valve of the rotary compressor.

NOTE: All inoperative compressors returned to

Friedrich must have all lines properly plugged with

the plugs from the replacement compressor.

Page 14

Troubleshooting Cooling

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Low voltage.

Check for voltage at compressor. 1115 volt and 230 volt

units will operate at 10% voltage variance.

Set thermostat to coldest position. Test thermostat and

replace if inoperative.

Hard start compressor. Direct test compressor. If com-

pressor starts, add starting components.

Check for continuity and resistance.

Thermostat not set cold

enough or inoperative.

Compressor hums but cuts off

on overload.

Open or shorted compressor

windings.

Compressor does not

run.

Open overload.

Test overload protector and replace if inoperative.

Open capacitor.

Test capacitor and replace if inoperative.

Inoperative system switch.

Broken, loose or incorrect

wiring.

Test for continuity in all positions. Replace if inoperative.

Refer to appropriate wiring diagram to check wiring.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Inoperative system switch.

Broken, loose or incorrect

wiring.

Open capacitor.

Fan speed switch open.

Inoperative fan motor.

Test switch and replace if inoperative.

Refer to applicable wiring diagram.

Fan motor does not

run.

Test capacitor and replace if inoperative.

Test switch and replace if inoperative.

Test fan motor and replace if inoperative (be sure internal

overload has had time to reset).

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Undersized unit.

Refer to Sizing Charts.

Thermostat open or inopera-

tive.

Set to coldest position. Test thermostat and replace if

necessary.

Dirty filter

Dirty or plugged condenser or

evaporator coil.

Clean as recommended in the Owner's Manual.

Use steam or detergents to clean.

Does not cool, or

cools only slightly.

Pool air circulation in area

being cooled.

Adjust discharge air louvers. Use high fan speed.

Close doors. Instruct customer on use of this feature.

Fresh air or exhaust air door

open on applicable models.

Low capacity - undercharge.

Compressor not pumping

properly.

Clean for leak and make repair.

Check amperage draw against nameplate. If not conclu-

sive, make pressure test.

Page 15

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Fuse blown or circuit tripped.

Replace fuse, reset breaker. If repeats, check fuse or

breaker size. Check for shorts in unit wiring and compo-

nents

Unit does not run.

Power cord not plugged in.

System switch in "Off" position.

Inoperative system switch.

Loose or disconnected wiring at

switch or other components

Plug in power cord

Set switch correctly.

Test for continuity in each switch position.

Check wiring and connections. Reconnect per wiring

diagram.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Dirty filter.

Clean as recommended in Owener's Manual.

Check for dirty or obstructed coil - clean as required.

Test for shorted thermostat or stuck contacts.

De-ice coil and check for leak.

Test fan motor and replace if inoperative.

De-ice coil. Check temperature differential across coil.

Touch test coil return bends for same temperature. Test for

low running current.

Restricted air flow.

Inoperative thermostat.

Short of refrigerant.

Inoperative fan motor.

Partially restricted capillary.

Evaporator coil

freezes up.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Excessive heat load.

Unit undersized. Test cooling performance of unit. Re-

place with larger unit.

Restriction in line.

Refrigerant leak.

Check for partially iced coil. Check temperature split

across coil.

Check for oil at silver soldered connections. Check for

partially iced coil. Check split across coil. Check for low

running amperage.

Compressor runs

continually. Does not

cycle off.

Thermostat contacts stuck.

Thermostat incorrectly wired.

Check operation of thermostat. Replace if contacts remain

closed.

Refer to appropriate wiring diagram.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Replace thermostat.

Turn to higher temperature setting to see if unit

cycles off.

Thermostat contacts stuck.

Thermostat set at coldest point.

Thermostat does not

turn unit off.

Refer to appropriate wiring diagram.

Refer to Sizing Chart.

Incorrect wiring.

Unit undersized for area to be

cooled.

Page 16

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Overload inoperative. Opens

too soon.

Compressor attempts to start

before system pressures are

equalized.

Check operation of unit. Replace overload if system

operation is satisfactory.

Allow a minimum of two (2) minutes for pressures to

equalize before attempting to restart. Instruct customer

of waiting period.

Check voltage with unit operating. Check for other

appliances on the circuit. The air conditioner should be

on a separate circuit for proper voltage, and be fused

separately.

Compressor attempts

to start, or runs for

short periods only.

Cycles on overload.

Low or fluctuating voltage.

Incorrect wiring.

Refer to appropriate wiring diagram.

Shorted or incorrect capacitor.

Check by substituting a known good capacitor of correct

rating.

Restricted or low air flow through

condenser coil.

Check for proper fan speed or blocked condenser.

Compressor running abnormally

hot.

Check for kinked discharge line or restricted condenser.

Check amperage.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Loss of charge in thermostat

bulb.

Place jumper across thermostat terminals to check if unit

operates. If unit operates, replace the thermostat.

Loose or broken parts in thermo- Check as above.

stat.

Thermostat does not

turn unit on.

Incorrect wiring.

Refer to appropriate wiring diagram.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Poorly installed unit.

Refer to Installation Instructions for proper installation.

Reposition - adjust motor mount.

Check that compressor grommets have not deteriorated.

Check that compressor mounting parts are not missing.

Fan blade striking chassis.

Compressor vibrating.

Improperly mounted or loose

cabinet parts.

Noisy operation.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Evaporator drain pan overflow-

Clean obstructed drain trough.

ing.

Condensation forming on base

pan.

Evaporator drain pan broken or cracked. Reseal or replace.

Water leaks into

room.

Poor installation resulting in rain Check installation instructions. Reseal as required.

entering room.

Condensation on discharge

grilles.

Dirty evaporator coil - clean. Very high humidity level.

Page 17

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Thermostat differential too

narrow.

Replace thermostat.

Plenum gasket not sealing,

allowing discharge air to short

cycle the thermostat.

Check gasket, reposition or replace.

Thermostat short

cycles.

Restricted coil or dirty filter.

Thermostat bulb touching

Clean and advise customer of periodic cleaning of filter.

Adjust bulb bracket.

thermostat bulb support bracket. (Applicable models.)

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Anticipator (resistor) wire

disconnected at thermostat or

system switch.

Anticipator (resistor shorted or

open).

Refer to appropriate wiring diagram.

Prolonged off cycles

(automatic operation).

Replace thermostat block and resistor.

(Applicable models.)

Partial loss of charge in thermo- Replace thermostat.

stat bulb causing a wide differ-

ential.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Switches from cooling Thermostat sticking.

Change room thermostat.

to heating.

Incorrect wiring.

Refer to appropriate wiring diagram.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Evaporator drain pan cracked or Repair, clean or replace as required.

obstructed.

Water in compressor area.

Detach shroud from pan and coil. Clean and remove old

sealer. Reseal, reinstall and check.

Outside water leaks.

Obstructed condenser coil.

Fan blade and slinger ring

improperly positioned.

Steam clean.

Adjust fan blade 3/16 to 1/4" from condenser shroud.

Adjust fan motor mount to allow 3/16 to 1/4" clearance

between condenser fan blade and base pan.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Insufficient air circulation in air

conditioned area.

Adjust louvers for best possible air circulation.

Oversized unit.

Operate in "Fan-Auto (Moneysaver)" position.

Advise customer.

High indoor humidity.

Inadequate vapor barrier in

building structure, particularly

floors.

Page 18

Page 19

Page 20

Page 21

QUIETMASTER "KS" - "KM" SERIES PARTS LIST

REF.

PART NO.

DESCRIPTION

APPLICATION

ELECTRICAL PARTS

615-628-09

615-628-00

615-628-04

617-187-01

611-935-46

603-645-98

603-645-90

603-645-96

615-780-10

610-714-80

610-714-93

610-714-94

610-714-96

605-000-54

605-000-53

605-000-51

605-000-49

606-072-03

618-061-00

618-225-00

610-803-38

610-803-37

610-803-34

618-213-00

618-214-00

618-212-00

618-208-00

618-080-00

618-080-01

Compressor, Tecumseh, 115 V., 60 Hz., 1 Ph., Model RK5510E ..................................

Compressor, Tecumseh, 115 V., 60 Hz., 1 Ph., Model RK5512E ..................................

Compressor, Tecumseh, 115 V., 60 Hz., 1 Ph., Model RK5512EXD .............................

Compressor, Bristol, 230/208 V., 60 Hz., 1 Ph., Model H23B175ABCC .......................

Compressor, Tecumseh, 230/208 V., 60 Hz.,1 Ph., Model AWF5522EXN ....................

Overload, Compressor - MRA3790-114 .........................................................................

Overload, Compressor - MRA4703-117 .........................................................................

Overload, Compressor - MRA3794-114 .........................................................................

Overload, Compressor - MRA98982-117 .......................................................................

Motor, Fan .......................................................................................................................

Cord, Electric Supply - 15 Amp., 125 Volt ......................................................................

Cord, Electric Supply - 15 Amp., 250 Volt ......................................................................

Cord, Electric Supply - 20 Amp., 250 Volt ......................................................................

System Switch ................................................................................................................

Rocker Switch .................................................................................................................

Thermostat ......................................................................................................................

Capacitor, Run - 25/10 MFD, 370 V ................................................................................

Capacitor, Run - 25/7.5 MFD, 370 V...............................................................................

Capacitor, Run - 35/7.5 MFD, 370 V...............................................................................

Harness Wire, Compressor ............................................................................................

Harness Wire, Fan Motor ................................................................................................

Resistor Block - 115 V ....................................................................................................

Resistor Block - 230 V ....................................................................................................

REFRIGERATION SYSTEM COMPONENTS

618-501-01

618-501-00

618-500-05

618-500-02

618-503-03

618-502-00

01390212

03760520

03760545

03760479

603-081-01

Coil, Evaporator ..............................................................................................................

Coil, Condenser ..............................................................................................................

† Capillary Tube - .059 I.D. x 34" - 39" Long ..................................................................

† Capillary Tube - .059 I.D. x 31 5/8" - 35" Long ............................................................

Capillary Tube - .042 I.D. x 20" Long ...........................................................................

Capillary Tube - .049 I.D. x 44" Long ..............................................................................

Filter - Drier (use when repairing sealed system) ..........................................................

CHASSIS PARTS

614-939-05

618-072-00

618-110-00

600-713-12

Knob, Control ..................................................................................................................

Panel, Control .................................................................................................................

Bushing, Snap.................................................................................................................

Not Shown

Page 22

QUIETMASTER "KS" - "KM" SERIES PARTS LIST

REF.

PART NO.

DESCRIPTION

APPLICATION

REFRIGERATION SYSTEM COMPONENTS (Cont.)

618-027-00

618-042-00

618-028-00

618-043-00

618-204-00

618-207-00

618-226-00

618-076-00

618--148-00

618-172-00

618-167-00

618-168-00

618-171-00

608-658-08

608-658-09

618-230-00

618-202-00

618-206-00

915-003-01

605-420-03

605-420-04

606-106-03

606-106-01

606-106-05

618-033-00

618-047-00

618-025-00

618-041-00

618-036-00

618-049-00

618-026-00

618-169-00

618-169-01

618-173-00

618-174-00

618-149-00

618-175-00

618-215-00

618-034-05

618-034-18

618-034-01

618-038-00

618-188-00

618-188-01

610-289-00

01150934

Panel Assembly, Left Side.............................................................................................

Partition, Control Box ....................................................................................................

Bracket, Capacitor Mounting .........................................................................................

Strap, Capacitor .............................................................................................................

Decorative Panel ...........................................................................................................

Grommet, Suction Line .................................................................................................

Connector, Fresh Air & Exhaust ....................................................................................

Cover, Top ......................................................................................................................

Insulation, Top Cover .....................................................................................................

Insulation, Left Side Deck .............................................................................................

Deck...............................................................................................................................

Filter, Air ........................................................................................................................

Holder, Filter ..................................................................................................................

Air Foil ............................................................................................................................

Bracket, Resistor Block .................................................................................................

Clamp, Supply Cord ......................................................................................................

Fan Blade ......................................................................................................................

Blower Wheel .................................................................................................................

Inner Wall .......................................................................................................................

Mount, Motor .................................................................................................................

Shroud ...........................................................................................................................

Brace, Shroud ................................................................................................................

Insulation, Inner Wall .....................................................................................................

Blower Front ..................................................................................................................

Scroll ..............................................................................................................................

Door Slide Assembly .....................................................................................................

Base Pan .......................................................................................................................

Drain Pan .......................................................................................................................

Rear Grille .....................................................................................................................

Grommet, Compressor ..................................................................................................

* Not Shown

† Capillary length may vary, flow rate is the same.

Page 23

QUIETMASTER "KS" - "KM" SERIES PARTS LIST

REF.

PART NO.

DESCRIPTION

APPLICATION

CHASSIS PARTS (Cont.)

914-004-00

618-102-00

618-093-00

618-092-00

618-062-00

618-063-00

618-063-01

618-257-00

618-257-01

618-089-00

618-111-00

618-196-00

618-199-00

602-944-08

602-944-09

611-050-04

611-050-05

611-095-03

618-197-01

618-198-01

618-198-03

606-103-03

608-460-16

617-173-01

618-116-03

618-116-04

618-139-00

618-118-00

618-118-01

618-141-01

600-733-00

Bolt, Compressor Mounting...............................................................................................

Plenum Assembly ..............................................................................................................

Knob, Fresh Air & Exhaust ................................................................................................

Lever, Fresh Air & Exhaust................................................................................................

Connector, Louver .............................................................................................................

Louver, Grille .....................................................................................................................

Louver, with Handle ...........................................................................................................

Outer Shell (with Sill Plate) ...............................................................................................

Grille, Intake ......................................................................................................................

Guide, Shell .......................................................................................................................

Latch, Intake Grille ............................................................................................................

Wingboard .........................................................................................................................

Accessory Package ...........................................................................................................

Bracket, Support................................................................................................................

Angle, Wingboard (Top) .....................................................................................................

Angle, Wingboard (Side) ...................................................................................................

Gasket (Vinyl) ....................................................................................................................

Plastic Bag (Hardware) .....................................................................................................

Gasket, Chassis (Foam)....................................................................................................

Carton, Shipping................................................................................................................

Pad, Shipping ....................................................................................................................

Pad, Shipping (Top) ...........................................................................................................

Gasket, Window (Foam) ....................................................................................................

20 20 20 20 20

OPTIONAL ACCESSORIES

01900-235

01900-312

Drain - Condensate Connection Kit, DC-2 ........................................................................

Start Kit, Capacitor/Relay (Pow-R-Pak) ............................................................................

* Not Shown

Page 24

Page 25

Page 26

QUIETMASTER "KL" SERIES PARTS LIST

REF.

PART NO.

DESCRIPTION

APPLICATION

ELECTRICAL PARTS

615-935-47

610-714-85

605-000-49

606-072-03

618-061-00

618-225-00

610-803-34

618-211-00

618-208-00

618-080-01

Compressor, Tecumseh, 230/208 V., 60 Hz., 1 Ph., Model AWR5524EXN ........................................

Motor, Fan.............................................................................................................................................

Cord, Electric Supply - 20 Amp., 250 Volt ............................................................................................

System Switch ......................................................................................................................................

Rocker Switch.......................................................................................................................................

Thermostat ...........................................................................................................................................

Capacitor, Run - 35/7.5 MFD, 370 V ....................................................................................................

Harness Wire, Compressor ..................................................................................................................

Harness Wire, Fan Motor .....................................................................................................................

Resistor Block - 230 V ..........................................................................................................................

REFRIGERATION SYSTEM COMPONENTS

618-501-02

618-503-07

03760548

Coil, Evaporator ....................................................................................................................................

Coil, Condenser ....................................................................................................................................

† Capillary Tube - .054 I.D. X 37 1/4" - 40" Long .................................................................................

Filter Drier (use when repairing sealed system) ..................................................................................

614-831-00

CHASSIS PARTS

614-939-05

Knob, Control ........................................................................................................................................

Panel, Control .......................................................................................................................................

Bushing, Snap ......................................................................................................................................

Panel, Left Side ....................................................................................................................................

Insulation, Left Side ..............................................................................................................................

Partition, Control Box ...........................................................................................................................

Bracket, Capacitor Mounting ................................................................................................................

Strap, Capacitor ....................................................................................................................................

Decorative Panel ..................................................................................................................................

Grommet, Suction Line ........................................................................................................................

Connector, Fresh Air & Exhaust ...........................................................................................................

Cover, Top .............................................................................................................................................

Insulation, Top Cover ............................................................................................................................

Insulation, Left Side Deck ....................................................................................................................

Deck......................................................................................................................................................

Filter, Air ...............................................................................................................................................

Holder, Filter .........................................................................................................................................

Air Foil ...................................................................................................................................................

Bracket, Resistor Block ........................................................................................................................

Clamp, Supply Cord .............................................................................................................................

Fan, Blade ............................................................................................................................................

618-069-00

600-713-12

618-068-00

618-176-00

618-070-00

618-204-00

618-207-00

618-226-00

618-076-01

618-148-01

618-179-00

618-182-00

618-183-00

618-180-00

608-658-10

618-230-00

618-202-01

618-206-00

915-003-01

605-420-01

Not Shown

† Capillary length may vary, flow rate is the same.

Page 27

QUIETMASTER "KL" SERIES PARTS LIST

REF.

PART NO.

DESCRIPTION

APPLICATION

CHASSIS PARTS (Cont.)

606-106-02

618-066-00

618-067-00

618-077-00

618-100-00

618-169-02

618-178-00

618-181-00

618-215-00

318-071-01

618-074-00

618-188-02

01150934

Blower Wheel ...........................................................................................................................

Inner Wall .............................................................................................................................................

Mount, Motor .......................................................................................................................................

Shroud .................................................................................................................................................

Brace, Shroud ......................................................................................................................................

Insulation, Inner Wall ...........................................................................................................................

Blower Front ........................................................................................................................................

Scroll ....................................................................................................................................................

Door, Slide Assembly ..........................................................................................................................

Base Pan .............................................................................................................................................

Drain Pan .............................................................................................................................................

Grille, Rear ..........................................................................................................................................

Grommet, Compressor ........................................................................................................................

Bolt, Compressor Mounting.................................................................................................................

Plenum Assembly ................................................................................................................................

Knob, Fresh Air & Exhaust ..................................................................................................................

Connector, Louver ...............................................................................................................................

Louver, Grille .......................................................................................................................................

Louver, with Handle .............................................................................................................................

Lever, Fresh Air & Exhaust..................................................................................................................

Outer Shell (with Sill Plate) .................................................................................................................

Sill Plate ...............................................................................................................................................

Grille, Intake ........................................................................................................................................

Latch, Intake Grille ..............................................................................................................................

Wingboard ...........................................................................................................................................

Accessory Package .............................................................................................................................

Bracket, Support..................................................................................................................................

Angle, Wingboard (Top) .......................................................................................................................

Angle, Wingboard (Side) .....................................................................................................................

Gasket (Vinyl) ......................................................................................................................................

Plastic Bag (Hardware) .......................................................................................................................

Gasket, Chassis (Foam)......................................................................................................................

Carton, Shipping..................................................................................................................................

Pad, Shipping (Bottom) .......................................................................................................................

Pad, Shipping (Top) .............................................................................................................................

Pad, Shipping (Front & Rear) ..............................................................................................................

Guide, Shell .........................................................................................................................................

Gasket, Window (Foam) ......................................................................................................................

914-004-00

618-105-00

618-093-00

618-096-00

618-097-00

618-097-01

618-092-00

618-257-02

618-084-01

618-104-00

618-199-00

602-944-10

611-050-03

611-095-03

618-197-03

618-198-05

606-103-03

608-460-16

617-173-01

618-116-05

618-140-00

618-141-00

618-118-02

618-196-00

600-733-00

OPTIONAL ACCESSORIES

01900-235

01900-312

Drain - Condensate Connection Kit, DC-2 ..........................................................................................

Start Kit, Capacitor/Relay (Pow-R-Pak) ..............................................................................................

Page 28

Use Factory

Certified Parts . . .

Friedrich Air Conditioning Co.

4200 North Pan Am Expressway • P.O. Box 1540

San Antonio, Texas 78295-1540 • U.S.A.

Phone: (210) 357-4400

Fax: (210) 357-4480

Page 29

RAC-K (1/98)

Printed in U.S.A.

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