Friedrich El24j35a-3 Owner's Manual
1998
®
TwinTemp
Series
J
YS09J10
YS13J33
YM18J34A
YL24J35A
ES12J33
ES15J33A
EM18J34A
EL24J35A
EL33J35
EK12J33A
EK18J34A
Service & Parts
Manual
AMERICA’S BEST AIR CONDITIONER
TABLE OF CONTENTS
GENERAL
Friedrich Room Model Number Code .......................................................................................................4
Application and Sizing ..............................................................................................................................5
Instructions For Using Cooling Load Estimate Form.................................................................................6
Cooling Load Estimate Form ....................................................................................................................7
Heat Load Form .......................................................................................................................................8
Heating Load Form Friedrich Unit Heat Pumps ........................................................................................9
SPECIFICATIONS/PERFORMANCE DATA
Specifications “YS” - "YM" - "YL" Models.................................................................................................10
P er formance Data (Cooling) “YS” - "YM" - "YL" Models...........................................................................11
P er formance Data (Heating) “YS” - "YM" - "YL" Models...........................................................................11
Specifications “ES” - "EM" - "EL" - "EK" Models ......................................................................................12
P erf ormance Data (Cooling & Heating) “ES” - "EM" - "EL" - "EK" Models................................................13
REFRIGERANT REVERSE CYCLE
Refrigerant Flow Chart (Cooling Cycle)...................................................................................................14
Refrigerant Flow Chart (Heating Cycle)......................................................................................... ..........14
PAGE
INSTALLATION INSTRUCTIONS
Installation Instructions for DC-2 Drain Kit ...............................................................................................15
COMPONENTS OPERATION/TESTING
Compressors...........................................................................................................................................16
Thermal Overload (External) ...................................................................................................................16
Thermal Overload (Internal) ....................................................................................................................17
Fan Motor................................................................................................................................................17
Capacitor , Run ........................................................................................................................................18
System Control Switch (Heat Pump & Electric Heat Models) ..................................................................18
Thermostat..............................................................................................................................................19
Thermostat (“YQ” Model) ........................................................................................................................18
Thermostat Adjustment ..........................................................................................................................20
Resistor (Heat Anticipator) ......................................................................................................................20
MoneyS aver Switch.................................................................................................................................20
Heat Element ..........................................................................................................................................21
Defrost Thermostat (Heat Pump Models) ................................................................................................21
Defrost Bulb Location (Heat Pump Models).............................................................................................22
Solenoid Coil (Heat Pump Models Only) .................................................................................................22
Check Valv e.............................................................................................................................................22
Drain Pan Valve.......................................................................................................................................22
Reversing Valve (Heat Pump Models Only).............................................................................................23
TTJ-0198 (10/97) (Page 2 of 64)
Sealed Refrigeration System Repairs......................................................................................................24
Hermetic Component Replacement ........................................................................................................24
Special Procedure in the Case of Motor Compressor Burn-Out ..............................................................25
Rotary Compressor Special Troubleshooting & Service ..........................................................................25
Refrigerant Charge..................................................................................................................................25
TROUBLESHOO TING
T roubleshooting T ouch Test Chart............................................................................................................26
Troubleshooting Cooling ..........................................................................................................................27
Troubleshooting Heating (Heat Pump Models) ........................................................................................ 31
Troubleshooting Heating (Cooling/Electric Models) .................................................................................34
WIRING DIAGRAMS
YS09J10............................................................. 618-200-04 ................................................. .................36
YS13J33............................................................. 618-200-02 ................................................. .................37
YM18J34A..........................................................618-200-02 ..................................................................37
YL24J35A...........................................................618-200-02 ..................................................................37
ES12J33............................................................. 618-200-01 ................................................. .................38
ES15J33A ..........................................................618-200-01 ..................................................................38
EM18J34A..........................................................618-200-01 ..................................................................38
EL24J35A...........................................................618-200-01 ..................................................................38
EL33J35 .............................................................618-200-01 ..................................................................38
EK12J33A ..........................................................618-200-01 ..................................................................38
EK18J34A ..........................................................618-200-01 ..................................................................38
TABLE OF CONTENTS (Cont.)
Page
PARTS LIST
"YS" - "YM" - "YL” Series Parts List..........................................................................................................39
“ES" - "EM” Series Parts List ...................................................................................................................46
“EL” Series P arts List...............................................................................................................................51
“EK” Se ries Parts List ..............................................................................................................................56
TTJ-0198 (10/97) (Page 3 of 64)
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 Series
W = Thru-The-Wall, W allMaster Series
2nd DIGIT - TYPE
C = Casement
P = PowerMiser “Portable”
Q = QStar
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
E S 15 H 3 3 A
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
TTJ-0198 (10/97) (Page 4 of 64)
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 ma y 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 7. 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 requirements.
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 f or 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
P age 6.
When sizing a TwinTemp unit for cooling and heating, we must remember that the heating capacity of any giv en unit
varies directly with the outdoor ambient temperature . Also , we must keep in mind the av erage 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 o versize, or undersiz e, 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 auxiliary heating facilities must be provided to insure that adequate heat is available at all times.
TTJ-0198 (10/97) (Page 5 of 64)
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 f or 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 f or areas
in the continental United States having other outside design temperatures by applying a correction factor f or the
particular locality as determined from the map.
C. The form includes “day” f actors for calculating cooling loads in rooms where da ytime comf ort is desired (such as
living rooms, offices, etc.)
D . The n umbers of the following paragraphs refer to the corresponding numbered item on the form:
1. Multiply the square feet of window area for each e xposure by the applicable factor. The window area is the
area of the wall opening in which the window is installed. F or 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” includes all types of single thickness windows, and “Double Glass” includes sealed airspace types, storm
windows, and glass b lock. Only one n umber 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 applicab le 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 “Nor th Exposure.” Do not consider trees and shrubbery as providing per manent
shading. An un-insulated 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 thic kness is considered “Heavy Construction.”
3b. Multiply the total length (linear feet) of all inside walls betw een the space to be conditioned and any uncon-
ditioned spaces by the given f actor . 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 f actor 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. F or best results, a room air conditioner unit or units having a cooling capacity r ating (determined in accordance
with the NEMA Standards Publication for Room Air Conditioners, CN 1-1960) as close as possible to the estimated 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 w ould operate more nearly continuously.
F. Intermittent loads such as kitchen and laundry equipment are not included in this form.
TTJ-0198 (10/97) (Page 6 of 64)
COOLING LOAD ESTIMATE FORM
TTJ-0198 (10/97) (Page 7 of 64)
HEAT LOAD FORM
The heat load form, Page 9, may be used by servicing
personnel to determine the heat loss of a conditioned
space and the ambient winter design temperatures in
which the unit will heat the calculated space.
The upper half of the form is f or computing the heat loss
of the space to be conditioned. It is necessary only to
insert the proper measurements on the lines provided
and multiply by the giv en factors, then add this result f or
the total heat loss in BTU/Hr./°F.
The BTU/Hr. per °F temperature difference is the 70°F
inside winter designed temperature minus the lowest
outdoor ambient winter temperature of the area where
the unit is installed. This temper ature diff erence is used
as the multiplier when calculating the heat loss.
The graph sho ws the following:
Left Hand Scale Unit capacity BTU/Hr. or heat
loss BTU/Hr.
Bottom Scale Outdoor ambient temperature,
base point.
Heat Pump Model BTU/Hr. capacity heat pump will
deliver at outdoor temperatures .
Balance Point Maximum BTU/Hr. heat pump
will deliver at indicated ambient
temperature.
Below is an example using the heat load form:
A space to be conditioned is part of a house geographi-
cally located in an area where the lowest outdoor ambient winter temperature is 40°F. The calculated heat loss
is 184 BTU/Hr./°F.
Subtract 40°F (low est outdoor ambient temperature f or
the geographical location) from 70°F (inside design temperature of the unit) for a difference of 30°F. Multiply
184 by 30 for a 5500 BTU/Hr. total heat loss for the calculated space.
On the graph, plot the base point (70°) and a point on
the 40°F line where it intersects with the 5500 BTU/Hr.
line on the left scale. Draw a straight line from the base
point 70 through the point plotted at 40°F. This is the
total heat loss line.
Knowing that we have a 5500 BTU/Hr. heat loss, and
we expect that our heat pump will maintain a 70°F inside temperature at 40°F outdoor ambient, we plot the
selected unit capacity BTU/Hr. of the unit between 35°
and 60° on the graph and draw a straight line between
these points. Where the total heat loss line and the unit
capacity line intersect, read down to the outdoor ambient temperature scale and find that this unit will deliver
the required BTU/Hr. capacity to approximately 30°F.
TTJ-0198 (10/97) (Page 8 of 64)
TTJ-0198 (10/97) (Page 9 of 64)
SPECIFICATIONS YS09J10 YS13J33 YM18J34A YL24J35A
BTUH (Cooling) 9000 13000 17500 24000
BTUH (Heating) 8300 12400 16500 23000
E.E.R. (Cooling) 11.5 9.8 9.4 9.0
E.E.R. (Heating) 11.0 9.4 9.6 9.8
V olts 115 230 230 230
Amperes (Cooling) 7.2 6.0 8.3 12.0
Amperes (Heating) 6.7 6.0 7.6 10.4
Total Watts (Cooling) 780 1325 1860 2665
Hertz 60 60 60 60
Fuse/Breaker Size 15 20 30 30
Amps 16.0 19.5 24.0
Resistance
Watts 3500 4200 5500
Heater
BTUH 10700 13000 17300
Fan RPM 1110 1110 1120 1120
13000 17500 23800
12300 16300 22800
9.8 9.4 9.0
9.4 9.6 9.8
208 208 208
6.5 9.1 13.0
6.5 8.3 11.5
1325 1860 2645
14.7 17.0 22.4
2900 3500 4650
8900 10600 14300
Evaporator Air CFM 300 325 425 600
Exhaust Air CFM Yes Yes Yes Yes
Dehumidification Pts/Hr 1.7 3.5 5.2 7.0
Width 25
Height 15
Depth 27
Minimum Ext. Into Room 3
Minimum Ext. to Outside 16
15/16"2515/16"2515/16" 28"
15/16"1515/16"1715/16"203/16"
3/8"273/8"273/8"335/8"
1/16"31/16"31/16"33/16"
15/16"1615/16"1615/16"1815/16"
Net Weight 113 117 141 198
Shipping Weight 1 24 128 153 217
TTJ-0198 (10/97) (Page 10 of 64)
PERFORMANCE EVAPORATOR AIR OPERATING ELECTRICAL R-22 COMP.
DATA* TEMP. °F. PRESSURES RATINGS REFRIG. OIL
Cooling DISCHARGE TEMP. SUCTION DISCHARGE AMPS LOCKED CHARGE IN CHARGE IN
AIR DROP °F ROTOR AMPS OZ. FLUID OZ.
YS09J10 59.0 21.0 87.0 241 7.2 39.2 28.0 11.8
YS13J33 56.0 24.0 75.0 280 6.0 29.0 30.0 11.8
YM18J34 53.0 27.0 74.0 277 8.7 42.0 54.0 30.0
YL24J35A 55.0 25.0 77.0 272 12.0 61.0 69.0 32.0
6.5
9.3
13.0
* Rating Conditions: 80°F Room Air Temperature and 50% Relative Humidity with
95°F Outside Air T emperature at 40% Relative Humidity.
PERFORMANCE DATA *YS09J10 **YS13J33 **YM18J34A **YL24J35A
(Heating)
AHAM @ 70°F Inside 47°F Outside 8300 12400/12300 17200/17200 23000/22800
@ 70°F Inside 35°F Outside 10700/8900 13000/10600 17300/14300
Evaporator Air Temperature Rise
@ 70°F Inside 47°F Outside 19.62 31.38 24.74 31.71
@ 70°F Inside 35°F Outside 28.69/23.87 24.46/20.22 24.38/20.16
AMPS @ 70°F Inside 47°F Outside 6.7 6.0/6.5 8.5/9.0 10.4/11.5
@ 70°F Inside 35°F Outside 16.0/14.7 19.5/17.0 24.0/22.4
Watts @ 70°F Inside 47°F Outside 760 1340/1300 1880/1820 2350/2340
@ 70°F Inside 35°F Outside 3500/2900 5500/4650 5500/4650
Suction/Head PSIG
@ 70°F Inside 47°F Outside 53.5/222 52.5/251 53/225 54/236.5
* Do not operate below 37° ambient.
** Heating element comes on at 35°F outside ambient and compressor shuts off.
TTJ-0198 (10/97) (Page 11 of 64)
SPECIFICATIONS ES12J33 ES15J33A EM18J34 EL24J35A EL33J35 EK12J33A EK18J34A
BTUH (Cooling) 12000 15000 18500 24000 33000 12500 18000
BTUH (Heating) 10700 10700 13000 17300 17300 10700 13000
E.E.R. (Cooling) 10.5 9.6 10.0 9.2 9.0 9.6 9.6
E.E.R. (Heating)
12000 15000 18300 24000 32500 12500 18000
8900 8900 10600 14300 14300 8900 10600
11.0 9.6 10.0 9.1 9.0 9.6 9.6
V olts 230 230 230 230 230 230 230
208 208 208 208 208 208 208
Amperes (Cooling) 5.5 6.9 8.4 12.0 17.0 5.8 8.3
5.7 7.5 9.0 13.3 18.0 6.2 9.1
Amperes (Heating) 16.0 16.0 19.5 24.0 24.0 16.0 19.5
14.7 14.7 17.0 22.4 22.4 14.7 17.0
Total Watts (Cooling) 1140 1665 1850 2610 3670 1250 1875
1090 1655 1830 2640 3610 1250 1875
Hertz 60 60 60 60 60 60 60
Fuse/Breaker Size 20 20 30 30 30 20 30
Fan RPM 1120 1100 1120 1100 1100 1080 1120
Evaporator Air CFM 325 325 425 560 700 325 440
Fresh Air CFM Yes Y es Yes Yes Yes Yes Yes
Exhaust Air CFM Yes Yes Y es Yes Yes Yes Yes
Dehumidification Pts/Hr 3.5 5.0 5.7 7.7 11.0 3.5 5.5
Width 25
Height 15
Depth 27
Minimum Ext. Into Room 3
15/16"2515/16"2515/16" 28" 28" 2515/16"2515/16"
15/16"1515/16"1715/16"203/16"203/16"1515/16"1715/16"
3/8"273/8"273/8"335/8"335/8"273/8"273/8"
1/16"31/16"31/16"33/16"33/16"31/16"31/16"
Minimum Ext. to Outside 16
15/16"1615/16"1615/16"1815/16"1815/16"1615/16"1615/16"
Net Weight 110 121 135 191 215 108 133
Shipping Weight 1 21 13 2 147 2 10 234 119 145
TTJ-0198 (10/97) (Page 12 of 64)
PERFORMANCE EVAPORATOR AIR OPERATING ELECTRICAL R-22 COMP.
DATA* TEMP. °F. PRESSURES RATINGS REFRIG. OIL
Cooling DISCHARGE TEMP. SUCTION DISCHARGE AMPS LOCKED CHARGE IN CHARGE IN
AIR DROP °F ROTOR AMPS OZ. FLUID OZ.
ES12J33 58.0 22.0 77.5 266 5.5 26.3 26.0 11.8
ES15J33A 53.0 27.0 77.0 260 7.4 42.0 49.0 30.0
EM18J34A 55.0 25.0 73.0 262 8.2 42.0 49.0 30.0
EL24J35A 55.0 25.0 73.5 280 12.0 61.0 53.0 32.0
EL33J35 52.0 28.0 71.0 299 17.0 94.0 81.0 35.0
EK12J33A 57.0 23.0 79.0 293 5.8 26.3 26.0 11.8
EK18J33A 55.0 25.0 73.0 262 8.2 42.0 46.0 30.0
5.7
8.2
8.7
13.3
18.0
6.2
8.8
* Rating Conditions: 80°F Room Air Temperature and 50% Relative Humidity with
95°F Outside Air T emperature at 40% Relative Humidity.
PERFORMANCE DATA VOLTS BTUH CFM HEAT RISE
Heating HIGH SPEED
ES12J33 230 10700 1120 30.5
208 8900
ES15J33A 230 10700 1100 30.5
208 8900
EM18J34A 230 13000 1120 28.3
208 10600
EL24J35A 230 17300 1100 28.6
208 14300
EL33J35 230 17300 1110 22.8
208 14300
EK12J33A 230 10700 1080 30.5
208 8900
EK18J34A 230 13000 1120 27.5
208 10600
TTJ-0198 (10/97) (Page 13 of 64)
TTJ-0198 (10/97) (Page 14 of 64)
INSTALLATION INSTRUCTIONS
FOR DC-2 DRAIN KIT
STEP 1 Before sliding chassis into outer shell, turn chassis on its side and add drain hole by drilling ½"
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 ¼" holes in outer shell as shown in Figure 3. Also drill a 3/8"
diameter hole in the base pan 3½" from the back and 3½" from right side.
STEP 4 Small and Medium Chassis Models - Mount in second and third holes from the rear of shell;
See Figure 4.
STEP 5 Large Chassis Models - Mount in third and fourth holes from the rear of shell; see Figure 5.
STEP 6 Connect a suitable length of garden hose or other tubing to end of the drain tube to drain the
condensate away.
TTJ-0198 (10/97) (Page 15 of 64)
COMPONENTS OPERATION & TESTING
WARNING
DISCONNECT ELECTRICAL POWER TO
UNIT BEFORE SERVICING OR TESTING
COMPRESSORS
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.
Compressors are single phase, 115 or 230/208 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 compressor terminal bo x cover and disconnect
wires from terminals. Using an ohmmeter, check continuity across the following:
1. Terminal “C” and “S” - no continuity - open winding - replace compressor.
2. T erminal “C” and “R” - no continuity - open winding - replace compressor.
3. Terminal “R” and “S” - no continuity - open winding - replace compressor.
Figure 2: Typical Ground Test
CHECKING COMPRESSOR EFFICIENCY
The reason for compressor inefficiency is normally due
to brok en 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 gauges to the high and low sides of the
system.
3. Start the system and run a “cooling or heating
perf ormance test.”
Figure 1: Compressor Winding Test
If test shows:
A. Below normal high side pressure.
B. Above normal low side pressure.
C. Low temperature diff erence across coil.
The compressor valves are faulty - replace the
compressor.
THERMAL OVERLOAD (External)
Some compressors are equipped with an e xternal overload which is located in the compressor terminal box
adjacent to the compressor body (see Figure 3.)
TTJ-0198 (10/97) (Page 16 of 64)
The overload is wired in series with the common motor
terminal. The over load 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.
Figure 3: External Overload
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 se v eral hours before the heat
is dissipated.
CHECKING THE INTERNAL OVERLOAD
(see Figure 4.)
Figure 4 INTERNAL OVERLOAD
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 ov erload.
2. Allow time for overload to reset before attempting
to test.
3. Apply ohmmeter probes to terminals on overload
wires. There should be continuity through the ov erload.
TERMINAL OVERLOAD (Internal)
1. With no power to 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 mus t
be replaced.
FAN MOTOR
A single phase permanent split capacitor motor is
used to drive the e vapor ator bl ower and condenser
fan. A self-resetting overload is located inside the
motor to protect against high temperature and high
amperage conditions.
FAN MOTOR - TEST
1. Determine that capacitor is serviceable.
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.
TTJ-0198 (10/97) (Page 17 of 64)
2. Disconnect fan motor wires from fan speed s witch
or system switch.
3. Apply “liv e” test cord probes on b lack wire and common terminal of capacitor. Motor should run at high
speed.
Figure 5: Fan Motor
4. Apply “live” test cord probes on red wire and common terminal of 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.
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.
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.)
CAPACITOR - TEST
1. Remove capacitor from unit.
2. Check for visual damage such as b ulges , cracks, or
leaks.
3. For dual rated, apply an ohmmeter lead to common
(C) terminal and the other probe to the compressor
(HERM) terminal. A satisfactory capacitor will cause
a deflection on the pointer , then gradually mov e back
to infinity .
4. R everse 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. Repeat steps 3 and 4 to check fan motor capacitor .
NOTE: A shorted capacitor will indicate a low resis-
tance and the pointer will mov e 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.
SYSTEM CONTROL SWITCH
(Heat Pump & Electric Heat Models)
An eight position control switch is used to regulate the
operation of the fan motor and compressor. The compressor can be operated with the fan operating at low,
medium or high speed in the cooling or heating mode.
The fan motor can also be operated independently on
medium speed. See s witch section as indicated on decorative control panel (see Figure 7.)
1. "Off" Position - everything is off.
Figure 6: RUN CAPACITOR HOOK-UP
TTJ-0198 (10/97) (Page 18 of 64)
2. "Lo Cool" P osition - fan operates on low speed, compressor is on.
3. "Med Cool" Position - fan operates on medium
speed, compressor is on.
4. "Hi Cool" Position - fan operates on high speed,
compressor is on.
5. "Hi Heat" Position - fan operates on high speed,
compressor or electric heater is on.
6. "Med Heat" Position - fan operates on medium
speed, compressor or electric heater is on.
Figure 7: SYSTEM CONTROL PANEL
(Heat Pump & Electric Heat Models)
SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch. Turn control to
position being tested (see Figure 8.) There must be continuity as follows:
1. "Off" Position - no continuity between terminals.
2. "Lo Cool" Position - between terminals "C" and "3",
"C2" and "2", "LO" and "M/S", "AR" and "5".
3. "Med Cool" Position - between terminals "C" and
"3", "C2" and "2", "M" and "M/S", "AR" and "5".
4. "Hi Cool" Position - between terminals "C" and "3",
"C2" and "2", "H" and "M/S", "AR" and "5".
5. "Hi Heat" Position - between terminals "C" and "1",
"C2" and "4", "H" and "M/S", "AR" and "5".
6. "Med Heat" Position - between terminals "C" and
"1", "C2" and "4", "M" and "M/S", "AR" and "5".
7. "Lo Cool" Position - between terminals "C" and "1",
"C2" and "4", "LO" and "M/S", "AR" and "5".
7. "Lo Heat" P osition - fan operates on low speed, compressor or electric heater is on.
8. "Fan Only" Position - operates on medium speed.
NOTE: Heat pump models with electric heat - in the
heat position, heating element only will be energized when outdoor temperature is below the
operating range of the heat pump.
Figure 8: SYSTEM CONTROL SWITCH
(Heat Pump & Electric Heat Models)
8. "Fan Only" Position - between terminals "L1" and
"M".
THERMOSTAT - (see Figure 9)
A cross ambient thermostat is used on all heat pump
and electric heat units. In addition to cycling the unit in a
heating or cooling operation, the thermostat will terminate the cooling 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
Figure 9: THERMOSTAT
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