Friedrich KQ08J50A-B Guide

EX0302 (10-03)
2003 International
Service & Parts Manual
Room Air Conditioners
50 Hz Models
MODELS
KQ08J50A-B
SS12J50A-A
SM18J50B-B
SM24J50B-B
ES12J53A-A
EM18J53A-B
EM24J53A-B
YM18J50A-B
YS12J50A-A

Page 2
Page 3

Page 2
Page 3
General......................................................................................................................................... 4
Specications....................................................................................................................... 4
Operating Data ..................................................................................................................... 6
Installation Instructions For DC-2 Drain Kit ...................................................................... 7
Compressors........................................................................................................................ 8
Component Operation And Testing .............................................................................. 8
Thermal Overload (External)............................................................................................... 9
Fan Motor.............................................................................................................................. 9
Run Capacitor ..................................................................................................................... 10
System Control Switch........................................................................................................ 11
System Control Switch........................................................................................................ 11
System Control Switch........................................................................................................ 12
Thermostat ........................................................................................................................... 13
Thermostat Bulb Location .................................................................................................. 13
Thermostat ........................................................................................................................... 14
Thermostat Adjustment....................................................................................................... 14
Resistor (See Figure 17)...................................................................................................... 15
MoneySaver® Switch........................................................................................................... 15
Heating Element - (See Figure 19)...................................................................................... 16
Defrost Thermostat............................................................................................................ 16
Defrost Bulb Location ......................................................................................................... 17
Solenoid Coil ........................................................................................................................ 17
Check Valve - (Figure 22) .................................................................................................... 17
Valve, Drain Pan (See Figure 23) ........................................................................................ 18
Reversing Valve ................................................................................................................... 18
Electronic Control (See Figure 12) ..................................................................................... 19
Sealed Refrigeration System ............................................................................................. 21
Hermetic Component Replacement ................................................................................... 22
Special Procedures In The Case Of Compressor Motor Burn-out .................................. 22
Rotary Compressor Special................................................................................................ 24
Refrigerant Charge .............................................................................................................. 24
Refrigerant Reverse Cycle
Refrigerant Flow Chart — Heat Pump Models .................................................................. 24
Refrigerant Flow Chart, Cooling Cycle .............................................................................. 24
Refrigerant Flow Chart, Heating Cycle .............................................................................. 24
Routine Maintenance........................................................................................................... 23
Troubleshooting
Troubleshooting Touch Test Chart..................................................................................... 24
Troubleshooting Cooling .................................................................................................... 25
Troubleshooting Heating (Heat Pumps) ............................................................................ 29
Troubleshooting Heating (Cooling/Electric Models) ........................................................ 31
Troubleshooting Heating (Cooling/Electric Models) ........................................................ 33
Wiring Diagrams .................................................................................................................. 35-40
PARTS LISTS
"KQ" Series Chassis Parts List .......................................................................................... 41
"KQ" Series Cabinet Parts List........................................................................................... 42
QuietMaster "SS" & "SM" Series Chassis Parts ............................................................... 45
QuietMaster "SS" & "SM" Series Cabinet Parts................................................................ 46
"ES" – "EM" – "YS" – "YM" Series Chassis Parts ............................................................ 50
"ES" – "EM" – "YM" Series Cabinet & Mounting Parts .................................................... 51
TABLE OF CONTENTS

Page 4
Page 5
Btu/hr 18,000 24,000 8,100 12,000
k.Cal./hr 4,536 6,048 2,041 3,024
E.E.R. - Btu/watt 8.5 8.5 9.5 9.0
E.E.R. - k.Ca./hr. 2.14 2.14 2.39 2.28
Volts 220/240 220/240 220/240 220/240
Amperes 10.2 13.5 3.9 6.5
Total Watts 2120 2825 850 1090
Fuse/Breaker Size (Amps) 15 20 15 15
Fan rpm-High 1200 1200 1300 970
Evaporator Air CFM 450 450 200 320
Evaporator Air M3/Hr 765 765 340 54
Dehumidication-Pts./hr. 5.7 8.5 2.5 3.0
Dehumidication-Lit./hr. 2.70 4.02 1.18 1.41
Width-Inches 25 15/16 25 15/16 19 3/4 25 15/16
Width-MM 659 659 502 659
Height-Inches 17 15/16 17 15/16 14 15 15/16
Height-MM. 456 456 356 405
Depth-Inches 27 3/8 27 3/8 21 3/4 27 3/8
Depth-MM 695 695 543 695
Min. Ext. Into Room-Inches 3 1/16 3 1/16 5 1/2 3 1/16
Min. Ext. Into Room-MM 78 78 140 78
Min. Ext to Outside-Inches 16 15/16 16 15/16 10 3/4 16 15/16
Min. Ext to Outside-MM 430 430 273 430
Shipping Weight-lbs. 150 160 84 122
Shipping Weight-kg 68.0 42.5 38.1 55.3
GENERAL
SPECIFICATIONS
SM18J50BB SM24J50BB KQ08J50AB SS12J50AA

Page 4
Page 5
Btu/Hr 12,000 12,000 18,000 18,000 24,000
k.Cal./hr 3,024 3,024 4,536 4,536 6,048
E.E.R. - Btu/watt 11.0 9.0 8.5 8.5 8.5
E.E.R. - k.Ca./hr. 2.77 2.28 2.14 2.14 2.14
Volts 220/240 220/240 220/240 220/240 220/240
Amperes 4.9 6.5 10.2 10.2 13.5
Total Watts 1090 1090 2120 2120 2825
Fuse/Breaker Size (Amps) 15 20 20 15 20
Fan rpm - High 970 970 1200 1200 1200
Evaporator Air CFM 320 320 450 450 450
Evaporator Air M3/hr. 544 544 765 765 765
Dehumidication - Pts./hr. 3.0 3.0 5.7 5.7 8.5
Dehumidication - Lit./hr. 1.41 1.41 2.70 2.70 4.02
Width - Inches 25 15/16 25 15/16 25 15/16 25 15/16 25 15/16
Width - MM 659 659 659 659 659
Height - Inches 15 15/16 15 15/16 17 15/16 17 15/16 17 15/16
Height - MM 405 405 456 456 456
Depth - Inches 27 3/4 27 3/8 27 3/8 27 3/8 27 3/8
Depth - MM 695 695 695 695 695
Min. Ext. into Room - Inches 3 1/16 3 1/16 3 1/16 3 1/16 3 1/16
Min. Ext. into Room - MM 78 78 78 78 78
Min. Ext to Outside - Inches 16 15/16 16 15/16 16 15/16 16 15/16 16 15/16
Min. Ext to Outside - MM 430 430 430 430 430
Shipping Weight - lbs. 122 121 150 170 160
Shipping Weight - kg 55.3 55.3 68.0 77.0 72.5
SPECIFICATIONS
YS12J50AA ES12J53AA EM18J53AB YM18J50AB EM24J53AB

Page 6
Page 7
OPERATING PRESSURES
Suction - PSI 78.0 72.0 68 80.0
Suction - ATM 5.3 4.89 4.62 5.44
Discharge - PSI 296 288 280 280
Discharge - ATM 20.14 19.60 19.05 19.04
ELECTRICAL RATING
(Compressor)
Amperes (FLA) 10.2 13.5 3.9 6.5
Locked Rotor Amps 52.0 78.0 20.0 32.0
REFRIGERANT, R-22
Charge in oz. 32.0 46.0 18.0 24.0
Charge in kg. 0,907 1,302 0,509 0,655
COMPRESSOR OIL
Charge in Fluid oz. 32 46 18 24
Charge in Liters 0,907 0,360 0,530 0,710
OPERATING DATA
OPERATING DATA ES12J53AA YS12J50AA EM18J53AB YM18J50AB EM24J53AB
OPERATING PRESSURES
Suction PSI 76.5 76.5 78.0 75.5 72.0
Suction - ATM 5.20 5.20 5.3 5.14 4.89
Discharge - PSI 264 264 296 260 288
Discharge - atm 17.96 17.96 20.14 17.69 19.60
ELECTRICAL RATING
(Compressor)
Amperes (FLA) 5.2 4.9 10.2 8.4 13.5
Locked Rotor Amps 32.0 32.0 52.0 52.0 82.0
REFRIGERANT, R-22
Charge in Oz. 24.0 24.0 32.0 33.0 46.0
Charge in kg 0,670 0,670 0,907 0,907 1,302
COMPRESSOR OIL
Charge in Fluid Oz. 15.0 15.0 32.0 32.0 32.0
Charge in Liters 0,444 0,444 0,907 0,907 0,907
SM18J50BB SM24J50BB KQ08J50AB SS12J50AA

Page 6
Page 7
RIGHT SIDE
APPROXIMATE
LOCATION OF EM-
BOSSMENT. DRILL
1/2 " DIA. HOLE.
BACK OF BASE PAN
10–24 x 3/8" LONG
SCREWS
DRAIN PLATE
10–24 NUTS
FIGURE 5
FIGURE 4
FIGURE 3
FIGURE 1 FIGURE 2
2"
6"
3/8"
3rd AND 4th HOLES
FROM REAR OF
SHELL
SMALL AND MEDIUM
CHASSIS MODELS
LARGE CHASSIS MODELS
BOTTOM VIEW
"SQ," "KQ," "YQ" MODELS
BOTTOM VIEW
3rd AND 4th HOLES
FROM REAR OF
SHELL
INSTALLATION INSTRUCTIONS FOR DC-2 DRAIN KIT
STEP 1 Before sliding the chassis into the outer shell, turn the chassis on its side and add a drain hole by drilling a
1/2" diameter hole as shown in Figure 1.
STEP 2 DC-2 mounts to the bottom of the outer shell as shown in Figure 2 on the right side as you face the unit. Use
two (2) 10-24 x 3/8" long machine screws and 10-24 hex nuts provided.
STEP 3 SQ, KQ, YQ Models - Drill two 1/4" holes in the outer shell as shown in Figure 3. Also drill a 3/8" diameter
hole in the base pan 3 1/2" from the back and 3 1/2" from the right side.
STEP 4 Small and Medium Chassis Models - Mount in the second and third holes from the rear of the shell. (See
Figure 4.)
STEP 5 Large Chassis Models - Mount in the third and fourth holes from the rear of the shell. (See Figure 5.)
STEP 6 Connect a suitable length of garden hose or other tubing to the end of the drain tube to drain the condensate
away.

Page 8
Page 9
FIGURE 1 COMPRESSOR WINDING TEST
FIGURE 2 TYPICAL GROUND TEST
CHECKING COMPRESSOR EFFICIENCY
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 refrigerant gas.
This condition can be checked as follows:
1. Install a piercing valve on the suction and
discharge or liquid process tube.
2. Attach gages 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 the coil.
The compressor valves are faulty - replace
the compressor.
GROUND TEST
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.
COMPONENT OPERATION AND TESTING
WARNING
DISCONNECT ELECTRICAL POWER
TO THE UNIT BEFORE SERVICING OR
TESTING
COMPRESSORS
Compressors are single phase, 220 or 220/240
volt, depending on the model unit. All compressor
motors are permanent split capacitor type, using
only a running capacitor across the start and run
terminal.
All compressors are internally spring mounted
and externally mounted on rubber isolators.
COMPRESSOR WINDING TEST
(See Figure 1.)
Remove the compressor terminal box cover
and disconnect the wires from the terminals.
Using an ohmmeter, check continuity across
the following:
1. Terminal "C" and "S" - no continuity - open
winding - replace compressor.
2. Terminal "C" and "R" - no continuity - open
winding - replace compressor.
3. Terminal "R" and "S" - no continuity open
winding - replace compressor.

Page 8
Page 9
FIGURE 3 EXTERNAL OVERLOAD FIGURE 4 INTERNAL OVERLOAD
CHECKING INTERNAL OVERLOAD
(See Figure 4.)
1. With no power to the unit, remove the leads
from the compressor terminals.
2. Using an ohmmeter, test continuity between
terminals "C–S" and "C–R." If not continuous,
the compressor overload is open and the
compressor must be replaced.
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
motor to protect against high temperature and
high amperage conditions.
TERMINAL OVERLOAD (Internal)
Some model compressors are equipped with an
internal overload. The overload is embedded
in the motor windings to sense the winding
temperature and/or current draw. The overload
is connected in series with the common motor
terminal. Should the internal temperature
and/or current draw become excessive, the
contacts in the overload will open, turning off
the compressor. The overload will automatically
reset, but may require several hours before the
heat is dissipated.
Heat generated within the compressor shell is
usually due to:
1. High amperage
2. Low refrigerant charge.
3. Frequent recycling.
4. Dirty Condenser.
TERMINAL OVERLOAD - TEST
(Compressor - External Type)
1. Remove overload.
2. Allow time for the overload to reset
before attempting to test.
3. Apply ohmmeter probes to the terminal
on the overload wires. There should be
continuity through the overload.
THERMAL OVERLOAD (External)
Some compressors are equipped with an external
overload which is located in the compressor
terminal box adjacent to the compressor body.
(See Figure 3:) The overload is wired in series
with the common motor terminal. The overload
senses both motor 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.

Page 10
Page 11
FIGURE 6 RUN CAPACITOR HOOK–UP
FAN MOTOR-TEST
1. Determine that the capacitor is serviceable.
2. Disconnect the fan motor wires from the fan
speed switch or system switch.
3. Apply "live" test cord probes on the black wire
and the common terminal of the capacitor.
Motor should run at high speed.
4. Apply "live" test cord probes on the red wire
and common terminal of the capacitor. Motor
should run at low speed.
5. Apply "live" test cord probes on each of the
remaining wires from the speed switch or
system switch to test intermediate speeds.
RUN CAPACITOR
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
motors. A single capacitor can be used for each
motor or a dual rated capacitor can be used for
both.
The capacitor’s primary function is to reduce the
line current while greatly improving the torque
characteristics of a motor. The capacitor also
reduces the line current 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.)
FIGURE 5 FAN MOTOR
CAPACITOR – TEST
1. Remove the capacitor from the unit.
2. Check for visual damage such as bulges,
cracks, or leaks.
3. For dual rated capacitors, apply an ohmmeter
lead to the common (C) terminal and the other
probe to the compressor (HERM) terminal. A
satisfactory capacitor will cause a deection
on the pointer, then gradually move back to
innity.
4. Reverse the leads of the probe and
momentarily touch the capacitor terminals.
The deection of the pointer should be two
times that of the rst check if the capacitor is
good.
5. Repeat steps 3 and 4 to check the fan motor
capacitor.
NOTE: A shorted capacitor will indicate a low
resistance and the pointer will move more to the
"0" end of the scale and remain there as long as
the probes are connected. An open capacitor will
show no movement of the pointer when placed
across the terminals of the capacitor.