Page 1
SERVICE MANUAL
AMC-15A
MOBILE
SERIES
Page 2
Page 3
Conten
t
1
1.1
1.2
1.3
2
3
4
4.1
5
6
7
7.1
7.2
8
9
9.1
9.2
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
11
11.1
11.2
11.3
11.4
12
13
13.1
13.2
CONTENT
Safety precaution ...................................................................................................................... 1
Installation
.............................................................................................................................................
1
Caution ...................................................................................................................................................
1
Operational .............................................................................................................................................
1
Specification .............................................................................................................................. 3
Out dimension ........................................................................................................................... 4
Display ....................................................................................................................................... 5
LED
display...........................................................................................................................................
5
Refrigerant cycle diagram ....................................................................................................... 7
PCB drawing & wiring diagram ..............................................................................................8
Unit Disassembly sequence
..................................................................................................... 11
Step1 Casing Disassembly
.............................................................................................................
11
Step2 Internal Parts Disassembly
...................................................................................................
12
Exploded
..............................................................................................................................................
13
Feature ..................................................................................................................................... 16
Parts of the Air Conditioner
..............................................................................................................
16
Accessories
.........................................................................................................................................
16
Electronic function ................................................................................................................. 17
Function
...............................................................................................................................................
17
Controller Specifications
.......................................................................................................................
17
Controller Structure
................................................................................................................................
17
Sensor Definitions.
................................................................................................................................
17
Mode
....................................................................................................................................................
17
Timer Settimg
......................................................................................................................................
19
Sleep
.....................................................................................................................................................
19
Protection function
........................ ......................................................................................................
19
Basic test procedure ................................................................................................................ 21
Defective compressor
..........................................................................................................................
21
Sealed refrigeration system
repairs ......................................................................................................
22
Fan
motor .............................................................................................................................................
24
Capacitor ..............................................................................................................................................
25
Characteristic of temperature sensor.................................................................................... 26
Trouble shooting...................................................................................................................... 27
Trouble shooting problems..................................................................................................................... 28
Trouble shooting for electrical system...................................................................................................
29
Page 4
Safet
y
Precaution
1
1 Safety precaution
1.1 Installation
For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service
center.
Do not disassemble or repair the product by yourself.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the
condenser and evaporator.
Be sure the installation area does not deteriorate with age.
Take care to ensure that power cable could not be pulled out or damaged during operation.
Do not place anything on the power cable.
Do not plug or unplug the power supply plug during operation.
Do not store or use flammable gas or combustible near the product.
When flammable gas leaks, turn off the gas and open a window for ventilation before turn the
product on.
If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the
power supply cable as soon as possible.
When the product is soaked (flooded or submerged), contact an Authorized service center.
Be caution that water could not enter the product.
Turn the main power off when cleaning or maintaining the product.
When the product is not be used for a long time, disconnect the power supply plug or turn off the
breaker.
1.2 Caution
Always check for gas (refrigerant) leakage after installation or repair of product.
Install the drain hose to ensure that water is drained away properly.
Keep level even when installing the product.
Do not install the product where the noise or hot air for the outdoor could damage the
neighborhoods.
Use two or more people to lift and transport the product.
Do not install the product where it will be exposed to sea wind (salt spray) directly.
1.3 Operational
Do not expose the skin directly to cool air for long periods of time. (Do not sit in the
draft). Do
not use the product for special purposes, such as preserving foods, works of art, etc. It is a
consumer air conditioner, not a precision refrigerant system.
Do not block the inlet or outlet of air flow.
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
Do not touch the metal parts of the product when removing the air filter. They are very sharp.
Do not step on pr put anything on the product.
Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
Do not insert hands or other object through air inlet or outlet while the product is
operated.
Do
not drink the water drained from the product.
Page 5
2
Specification
Replace the all batteries in the remote control with new ones of the same type. Do not mix old and
mew batteries or different types of batteries.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not
use the remote of the batteries have leaked.
Page 6
3
Specification
2 Specification
Model
AMC-15A
Nameplate
marking
Power
supply
Ph-V-Hz
1φ,220V~240V,50Hz
Cooling
Capacity W 4400
Cooling Power
consumption W 1700
Heating Power
consumption
W 1500
Cooling Rated
current A 7.5
Cooling
SCE W/W 2.61
System
data
Refrigerant
type
g R410A/605g
Operation
pressure
Mpa 5.5
Moisture Removal(30 ,RH80%)℃
L/DAY 70
Indoor air flow
(Hi/Mi/Lo)
m³/h 420/380/350
Noise level
(Hi/Mi/Lo)
dB(A) 56/53/50
Dimension&Weight
Dimension
(WxHxD)
mm 300x505x778
Packing
(WxHxD)
mm 330x550x815
Net/Gross
weight kg 28.5/30.5
System Details
Compressor
Model
44A293J-FEKC
Type
Rotary
Capacity
W 3349W±5%
Input
W 1220W±5%
Rated
current(RLA)
A 5.9A±5%
Locked rotor
Amp(LRA)
A 27.4A±5%
Thermal
protector
B220-150*-141C
Capacitor
30uF 450VAC
Refrigerant
oil
CC 270
Fan
Motor Inner Motor Outer Motor
Model
78-3-AL 71-3-AL
Input
W
100/90/81 114
Capacitor
3uF 3.5uF
Speed(hi/mi/lo)
±50
Rpm
1100/1000/900 1100
Evaporator
Number of
rows
3
Tube pitch(a)x row
pitch(b)
mm 21x19.7
Fin
spacing
FPI 18
Fin type
(code)
Hydrophilic
aluminum
tude outside dimension type
Ф7 inner groove tube
axial length x height x width
mm 298x273x38.1
Number of
circuits
2
Condenser
Number of
rows
4
Tube pitch(a)x row
pitch(b)
mm 21x19.7
Fin
FPI 18
Fin type
(code)
aluminum
tude outside dimension type
mm
Ф7 inner groove tube
axial length x height x width
mm 347x336x38.1
Number of
circuits
2
The test condition
is 35
'C db/24'C
wb
Page 7
4
Out dimension
3 Out dimension
Page 8
5
Displa
y
4 Display
4.1 LED display
1. POWER
Press
this
button to
switch
the
unit
on or
off
2.
FUNCTION
Press
this
button to select between Cooling
( ),
Heating
( )
or
Dehumidifying ( ) mode
3.
TEMP+
Pressing
this
button in cooling mode adjusts
the required room temperature by 1°C up to
a
maximum
temperature of
30°C.
Pressing
this
button in heating mode adjusts the required room temperature by 1°C up to
a
maximum
temperature of
25°C.
4. TEMP-
Pressing
this
button in cooling mode adjusts
the required room temperature by 1°C to a minimum
temperature of
17°C.
Pressing
this
button in heating
function
adjusts the
required
room temperature by 1°C to a mini
mum
temperature of
15°C
5.
LED-DISPLAY
The
display
shows
the current
ambient
temperature in
operation.
By pressing the
[TEMP+]
or
[TEMP-]
buttons, the required target temperature is displa
yed
.
When
pressing
the timer button
[TIMER],
the number of
hours
is
shown until
delayed
start up or
delayed
shutdown. After each setting, the display automa
tic
ally shows
the current am
bient
temperature again.
In
the
dehumidifying
mode,
“dH”
(or
“HP”
upside-down) is
shown
on the display.
Error messages are
also shown
in the display.
6. SPEED
Pressing this
button sets the ventilation speed to “
(low)”,
“
(medium)”,
“
(high)”
or
“AUTO
Page 9
6
Displa
y
(Automat
ic)”. If
“AUTO” is
selected, the ventilator
operates at
temperature differences larger than
9
degrees at top speed. If
the temperature reduces to a difference smaller than 4 degrees, the ventilator
switches
to middle blower
position.
If the temperature reduces further
until
the target temperature,
the
ventilator
switches
to the lowest blower
position.
7. TI
MER
Programmable timer button for
delayed
start up or
delayed
shutdown
How
to program a delayed start up
This function
is used to set the number of
hours
delay before the
appliance
comes on. Proceed as
follows:
Press
[TIMER]
button in
Stand-by
mode
(unit
is pl
ugged
in but not in operation, no
display on
the
panel), to set the number of
hours
delay before the
appliance
comes on.
Select the
required
function (cooling,
heating, and de
humid
ificat
ion),
wait
until
the
unit
displays
the
ambient temperature, and then set the desired
temperature.
After the set number of
hours
has expired, the
unit
starts automa
tic
ally.
If you press the
[POWER]
button before the time has expired, the
delayed
start up
will
be cancelled
,
the unit turns
on and can be
operated
in the required operating mode.
How
to program a delayed shutdow
n
This function
is used to set the number of
hours
delay before the
appliance
goes off. Proceed as follows:
Start the
unit
in required
function (cooling,
heating or dehumidifying)
Press the
[TIMER]
button
during operation and enter the required number of
hours
delay be
fore
the
appliance
goes off.
After the flashing of the number of
hours
on the
LED
has stopped, can select the
requir
ed
temperature.
After the set number of
hours
has expired, the
unit shuts
down au
toma
tic
ally.
If you press the
[POWER]
button before the
time
has expired, the
unit shuts
down.
8. SLEEP
This function
is ideal
for the night as
it
gradually
reduces operation of the
appliance.
The
sleep
function
maintains the room at
optimum
temperature
and
with silent operat
ion.
When you use the sleep
function,
first set the
timer
as
described
in the functions.
Delayed start and
delayed
shutdown:
Press the
[TIMER]
button
until
the required
hours
appear
on
the
disp
lay. After the hour di
splay,
the display
switches au
toma
tic
ally to the previous set temperature display
.
To
change the temperature, press the
[TEMP+]
or
[TEMP-]
buttons. With each press on the button,
the
temperature increases or decreases by 1°C.
Page 10
7
Refrigeran
t
cy
cle diagram
5 Refrigerant cycle diagram
The figure below is a brief description of the important components and their function in what is
called the refrigeration system
Page 11
8
PCB dr
awin
g
&
Wiring
diagram
6 PCB drawing & wiring diagram
The below picture is PCB schematic:
800161-0Y-4-5
The below picture is PCB Drawing
800161-0Y-4-5
Water full switch
Inner Motor Switch
10 pin plug Display
Inner Tempreature Sensor
OuterTempreature Sensor
Page 12
9
PCB dr
awin
g
&
Wiring
diagram
The below picture is Display schematic:
800145-BY-1
The below picture is Display Drawing:
800145-BY-1
Page 13
10
PCB dr
awin
g
&
Wiring
diagram
The below picture is PCB Layout:
800161-0Y-4-5
The below picture is Display Layout:
800145-BY-1
Wi
ring Diagram
Page 14
11
Feat
ure
7 Unit Disassembly sequence
7.1 Step1 Casing Disassembly
disassemble hot and cool air louver and unscrew the casing of front panel,side panel and top panel
disassemble Filter and unscrew
screws
screws
screws
Page 15
12
Feat
ure
7.2 Step2 Internal Parts Disassembly
Motor and PCB Disassembly：
please also dismantle the screws at two sides,for the right side is the fasten strip
Disassembly steps for water motor :
please dismantle the screws of condensor,slide up the partition panel.and then slow take out the
condensor from the left hand side.From there, you can see the water motor.Caution, please be
note that in order to avoid any water split by water wheel, you should uphold the condensor
screws
screws
Water motor
Water wheel
Page 16
25
Characteristic
of temperature senso
r
12 Characteristic of temperature sensor
Page 17
16
Electronic function
10 Electronic function
10.1 Function
10.1.1 Cooling , Heating or Dehumidifying mode
10.1.2 With Auto switch on, off and sleep mode function
10.1.3 Ts range：Cooling：17～30℃/65～90°F；Heating：15～25℃/60～80°F；
Time delay safety control
10.1.4 With 3 fan speed mode available in high, medium, low for the upper fan system while for the
lower fan system is only available with single speed. This single fan speed is working together with
the compressor and can auto detect the any damages within
10. 2 Controller Specifications
10.2.1 Normal power source: 220VAC±15％或 110VAC±15％
10.2.2 Operation temperature for electrical system
working temperature range：－10℃~＋60℃
storage temperature range：－20℃~＋70℃
relative humidity range：35~98%
10.2.3 temperature sensor：R25/50=5K、B=3470 temperature precision：±1℃
10.2.4 display ambient temperature
10.2.5
For Fahrenheit switching, please press function key for 10 s during the stand by mode.
10.3 Controller Structure
The control systems are consist of remote control, internal control display, main PCB board, and
internal receiver. While for internal PCB board output systems are consists of upper fan system
(high, medium and low) and compressor
10.4 Sensor Definitions
TA: Temperature of ambient, (T1).
TE: Temperature of evaporator, (T2).
TS: Setting temperature, (T3).
10.5 Mode
10.5.1Cooling
10.5.1.1 In cooling mode，set point temperature 17～30℃/60～90°F；starting temperature is 25℃
（77°F）。
10.5.1.2cooling mode compressor working condition:
Page 18
17
Electronic function
A: Under the condition of T1≥T +1℃（2°F）,compressor will be running
B:Under the condition of T1≤T +1℃（2°F）,the unit will be switched off,compressor will be
off too
C:Under the condition of T1≤T +1℃（2°F）,the compressor and internal motor system
will be switching back to the original setting
Note: When compressor is off, cooling operation light is splashing(0.5second per time)When the
compressor is running, the operation light will be turned on
10.5.1.3 During the cooling mode, the upper fan system can be set into auto,high,medium,low and
auto fan mode
High
Medium
Low
internal ambient temperature℃（°F）
set point temperature 2（3） 4（6）
10.5.1.4 Cooling mode,lower fan system is working together with compressor
10.5.2 Dehumidification mode( DH display)
10.5.2.1Upper fan system is operated in low fan. Lower fan is working together with the
compressor
10.5.2.2 Dehumidification mode.
A． Indoor temperature≤0℃,compressor will be off
B．0℃＜indoor temperature≤20℃,compressor will be on for 15 min and stop for 3 min
C．indoor temperature＞20℃compressor will be on for 30 min and stop for 3 min
We only can check the indoor temperature after such operation finishes after every week,
Note: When compressor is stop, the dehumidification indication light is on.
10.5.3Heating mode
10.5.3.1Heating mode: set point temperature range is 15～25℃（60～80°F）,starting temperature
is 20℃（68°F）
10.5.3.2 Heating mode, compressor working condition
A. Under the condition of T3-T1≥+1℃（2°F）compressor will be turned on
Page 19
18
Electronic function
B. Under the condition of T3-T1≤-1℃（2°F）compressor will be turned off
C. Under the condition of T1=T3-1℃（2°F）compressor will be operated under the original
setting mode
Note: Under the condition of compressor off. Heating light is splashing (0.5second per time)
compressor will be running and heating indication light will be turned on.
10.5.4 Heating mode, upper fan system is operated in high speed without setting. Lower fan system
is working together with compressor
10.6 Timer Setting
10.6.1 Tiner setting can be set 1-24 hours
10.6.2 During the unit operation, you can set numbers of hours.The unit will be auto switch off .While
the unit will be auto switch on if the unit is set in auto mode
10.7 Sleep
10.7.1 To set the sleep mode under the cooling setting, To increase this setting press the "UP" button and
for each press, the temperature will be increased by 1
℃, continually, the temperature will be rise up
to 2
℃ after the 2 hours operation.Apart from this, the temperature will not be rise up anymore.
10.7.2 To set the sleep mode under the heating setting, To increase this setting press the "down" button and
for each press, the temperature will be decreased by 1
℃, continually, the temperature will be decrease
to 2
℃ after the 2 hours operation. Apart from this, the temperature will not be rise up anymore.
10.7.3 It is confirmed that there is no sleep mode function during the dehumidification function
10.7.4 Under this sleep mode, the fan speed remained as low speed
10.8 Protection function
10.8.1 Compressor delay protection
10.8.1.1 When the unit is in operation, compressor need 3 min and 30s for starting
10.8.1.2 When compressor is off and restart again, restarting period is 3 min and 30s
10.8.2 Defrosting protection mode( display DF)
Compressor keep on working for 15 min.please check the fan coil temperature ≤1℃.thus
compressor will be turned off.if the compressor stop for 3 min&30s.Indoor fan coil temperature
＞2℃ compressor will be turned on and defrosting mode will be off
10.8.3 Water full protection (display E4)
When the water power is closed for 3 seconds, followed by water full protection, control
Page 20
19
Electronic function
system will be off. All the power will be off. Signal will be turn into E4. If the water full signal
is off., the control system has to be pressed on or off to restart the operation
10.8.4 E1:indicate the indoor temperature hot and
resistance is in error thus control system will be off.
10.8.5 E2:indicate the indoor temperature hot and
resistance is in error thus control system will be off.
10.8.6 Refrigerent leaking protection display as E3
Compressor turn on, if the tolerance is ≤5℃ at between indoor temperature and fan coil after operation
for 15 min.The compressor will be turn off, and upper fan system will be running at the set speed.The
signal display E3 and press the power key or power off to clear this signal.
Page 21
20
Basic te
st
procedure
11 Basic test procedure
11.1 Defective compressor
Compressors are single phase, 115 or 120 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.
11.1.1 Compressor wiring test
Remove compressor terminal box cover and disconnect wires from terminals. Using an ohmmeter,
check continuity across the following:
Terminal "C" and "S" - no continuity
- Open winding - replace compressor.
Terminal "C" and "R" - no continuity
- Open winding - replace compressor.
Terminal "R" and "S" - no continuity
- Open winding - replace compressor.
11.1.2 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.
11.1.3 Checking the 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 gauges to the high and low sides of the system.
3. Start the system and run a “cooling or heating performance test.”
Page 22
21
Basic te
st
procedure
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.
11.1.4 Terminal overload (external)
Some compressors are equipped with an external overload which is located in the compressor
terminal box adjacent to the compressor body 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.
Heat generated within the compressor shell is usually due to:
1. High amperage.
2. Low refrigerant charge.
3. Frequent recycling.
4. Dirty condenser.
11.1.5 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.
11.1.6 Checking the internal overload
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 must be replaced.
11.2 Sealed refrigeration system repairs
11.2.1 Equipment require
1. Voltmeter
2. Ammeter
3. Ohmmeter
4. E.P.A. Approved Refrigerant Recovery System.
Page 23
22
Basic te
st
procedure
5. Vacuum Pump (capable of 200 microns or less vacuum.)
6. Acetylene Welder
7. Electronic Halogen Leak Detector (G.E. Type H-6 or equivalent.)
8. Accurate refrigerant charge measuring device such as:
a. Balance Scales - 1/2 oz. accuracy b.
Charging Board - 1/2 oz. accuracy
9. High Pressure Gauge - (0 - 400 lbs.)
10. Low Pressure Gauge - (30 - 150 lbs.)
11. Vacuum Gauge - (0 - 1000 microns)
11.2.2 Equipment must be capable of:
1. Recovery CFC's as low as 5%.
2. Evacuation from both the high side and low side of the system simultaneously.
3. Introducing refrigerant charge into high side of the system.
4. Accurately weighing the refrigerant charge actually introduced into the system.
5. Facilities for flowing nitrogen through refrigeration tubing during all brazing processes.
11.2.3 Hermetic compressor
repl
ace
ment.
The following procedure applies when replacing components in the sealed refrigeration circuit or
repairing refrigerant leaks. (Include Compressor, condenser, evaporator, capillary tube, refrigerant
leaks, etc.)
1. Recover the refrigerant from the system at the process tube located on the high side of the system
by installing a line tap on the process tube. Apply gauge from process tube to EPA approved
gauges
from process tube to EPA approved recovery system. Recover CFCs in system to at least 5%.
2. Cut the process tube below pinch off on the suction side of the compressor.
3. Connect the line from the nitrogen tank to the suction process tube.
4. Drift dry nitrogen through the system and unsolder the more distant connection first. (Filter drier,
high side process tube, etc.)
5. Replace inoperative component, and always install a new filter drier. Drift dry nitrogen through
the system when making these connections.
6. Pressurize system to 30 PSIG with proper refrigerant and boost refrigerant pressure to 150 PSIG
with dry nitrogen.
7. Leak test complete system with electric halogen leak detector, correcting any leaks found.
8. Reduce the system to zero gauge pressure.
9. Connect vacuum pump to high side and low side of system with deep vacuum hoses, or copper
tubing. (Do not use regular hoses.)
10. Evacuate system to maximum absolute holding pressure of 200 microns or less. NOTE: This
process can be 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
minutes. Recover refrigerant, and proceed with evacuation of a pressure of 200 microns or a
minimum of 10%.
11. Break vacuum by charging system from the high side with the correct amount of refrigerant
specified. This will prevent boiling the oil out of the crankcase.
NOTE: If the entire charge will not enter the high side, allow the remainder to enter the low side in
Page 24
23
Basic te
st
procedure
small increments while operating the unit.
12. Restart unit several times after allowing pressures to stabilize. Pinch off process tubes, cut and
solder the ends. Remove pinch off tool, and leak check the process tube ends.
11.2.4 Special procedure in the case of compressor motor burnout.
1. Recover all refrigerant and oil from the system.
2. Remove compressor, capillary tube and filter drier from the system.
3. Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent, to remove
all contamination from system. Inspect suction and discharge line for carbon deposits. Remove and
clean if necessary.
4. Reassemble the system, including new drier strainer and capillary tube.
5. Proceed with processing as outlined under hermetic component replacement.
11.2.5 Rotary compressor special troubleshooting and service
Basically, troubleshooting and servicing rotary compressors 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 different order than the reciprocating compressors.
The terminal markings are on the cover gasket. Use your wiring diagram to insure correct
connections.
11.2.6 Refrigerant charge
1. The refrigerant charge is extremely critical. It must be measured 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 compressor and enter the balance of the charge, gas only,
into the low side.
The introduction of liquid into the low side, without 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.
11.3 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.
11.3.1 Fan motor test
1. Determine that capacitor is serviceable.
2. Disconnect fan motor wires from fan speed switch or system switch.
3. Apply "live" test cord probes on black wire and common terminal of capacitor. Motor should
run at high speed.
Page 25
24
Basic te
st
procedure
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.
11.4 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 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. Run capacitor hook-up line side of the capacitor is marked with a red
dot and is wired to the line side of the circuit
11.4.1 Capacitor test
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 common (C) terminal and the other probe to the
compressor (HERM) terminal. A satisfactory capacitor will cause a deflection on the pointer, and
then gradually 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. Repeat steps 3 and 4 to check fan motor capacitor.
NOTE: A shorted capacitor will indicate a low resistance and the pointer will move 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.
Page 26
25
Characteristic
of temperature senso
r
12 Characteristic of temperature sensor
Page 27
26
T
r
ouble shootin
g
13 Trouble shooting
PROBLEM POSSIBLE CAUSE REMEDY
Power failure
Check the power supplier if the power supplier is supplied to the
unit. Check the power cord and correct if damaged.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the input/output
is open or the transformer is damaged.
No power display
on panel or any one
of the buttons
failure.
Display board or main PCB
failure
Check the voltage on display board. Replace the display board if
it is +5V else replace the main PCB.
Remote control
failure.
Battery failure
Check the voltage of battery. Replace batteries if the voltage is
lower than 2.3V.
Check voltage. Call an electrician if not within limits.
Test capacitor.
Replace if not within +/-10% of manufacture's rating.
Check bearings. Replace the motor if the blower wheel cannot
rotate freely.
Fan motor runs
intermittently
Cycles on overload.
Pay attention to any change from high speed to low speed.
Replace the motor if the speed does not change.
Refrigerant
The amount of the refrigerant is too much, making the
compressor load too big. Recycle and recharge the refrigerant
after checking for the reason.
Compressor stops
instantly after
startup.
Compressor
The compressor is blocked inside. Replace after checking for
the reason.
No power Check voltage at electrical outlet. Correct if none.
Water alarm Check and correct if water alarm happens.
Power supply cord
Check voltage at the power cord terminal on Main PCB.
Replace the power cord if none.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the input/output
is open or the transformer is damaged.
Wire disconnected or
connection loose
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Main PCB failure
Select fan speed and Check the voltage on main PCB. Replace
the main PCB if no voltage in anyone.
Capacitor (Discharge
capacitor before testing)
Test capacitor.
Replace if not within +/-10% of manufacture's rating. Replace if
shorted, open or damaged.
Fan motor will not
run.
Will not rotate
Fan blower hitting scroll. Realign assembly.
Check fan motor bearings. Replace the motor if motor shaft do
not rotate.
Fan blower
Replace the fan blower if cracked, out of balance, or partially
missing.
Loose screws Tighten them.
Fan motor noise.
Worn bearings
Replace the motor if knocking sounds continue when running or
loose, or the motor hums or noise appears to be internal while
running.
Voltage Check voltage. Call Supply Authority if not within limits.
Wiring
Check the wire connections, if loose, repair or replace the
terminal. If wires are off, refer to wiring diagram for
identification, and replace. Check wire locations. If not per
wiring diagram, correct.
Main PCB failure Check voltage of main PCB. Replace the main PCB if open.
Compressor will
not run while fan
motor runs.
Capacitor (Discharge
capacitor before testing)
Check the capacitor.
Replace if not within +/-10% of manufacturers rating. Replace if
shorted, open, or damaged.
Page 28
27
Trouble shooting
Room temp sensor
Check the temperature setting if not at the coolest (in cooling
mode) or the warmest (in heating mode). Set it if not.
Compressor
Check the compressor for open circuit or ground. If open or
grounded, replace the compressor.
Excessive noise.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to
contact cabinet, compressor, shroud and barrier.
Water tank full Check and pour if the water tank is full.
Water depth sensor if failure Check and replace if failure.
Water depth is over load in
chassis
Check and drainage the water in the chassis by open the
drainage hose on the chassis.
Water full alarm
Water depth sensing
structure
Check and replace or realign if the structure is failure.
Air filter Clean or replace if restricted.
Air discharge pipe
Realign and assemble if the installation of the air discharging
pipe failure. Replace if damaged.
Unit undersized
Determine if the unit is properly sized for the area to be cooled
or heated.
Condenser and Evaporator Clean or replace if restricted.
Circulation in condensing
water
To check wether water motor damaged or water hose is block or
not
Fan motor
Check the fan capacitor and replace if not within +/-10% of
manufactures rating.
Air flow
Clean or remove if any barrier is found to block the inlet/outlet
wind flow of the unit.
Less refrigerant
Check the tubes for reasons of leakage. Recycle the refrigerant,
correct the leakage points and recharge.
Capillary tube
Regulate the flow if capillary tube and make the evaporating
temperature appropriate if the evaporator is frosted. Replace if
blocked. Repair joint if leaking.
Compressor
The inlet and outlet valve of the compressor is damaged,
making the low pressure connected with the high pressure. The
refrigerating system can not produce high pressure and low
pressure. Replace the compressor after checking for the reason.
Cooling or heating
feels not good
Heat sources Reduce if too many.
No power Check the voltage. Call an electrician if no within the limit.
Wiring Check the terminals. Repair and correct if loose.
Temperature setting Check and adjust the temperature setting.
Mode setting Check and adjust the mode setting.
Compressor
Check and replace if the compressor, the over-load protector or
wiring is broken.
Electric heater failure Check and replace if the heater is damaged.
Over heat fuse failure Check and replace if the fuse is damaged.
No cooling or
heating.
Main PCB
Check the voltage of main PCB. Replace the main PCB when
the unit failure in heating mode.
Power supply
The input power supply voltage is too low. Call an electrician if
not within limits.
Main PCB
Check and replace the main PCB if the compressor relay on
PCB is shorted or damaged.
The unit starts and
stops frequently.
Room temperature
When the room temperature is too high, the compressor will
protect.
Sudden change of
temperature units
from °C to °F and
vice versa
Solution: switching the units from °F to °C and viceversa
Procedure: Please switch off the unit to “STAND-BY”
mode by pressing the button “POWER” on the unit (the unit is
plugged in), hold for 5-10 seconds button “FUNC” on the unit
and after a beep sound switch on the unit by button “POWER”.
Page 29
28
T
r
ouble shootin
g
Trouble shooting problems
YES
YES
YES
no
no
YES
YES
YES
no
no
YES
no
YES
YES YES
no
no
no
YES
YES
YES YES
Power cord
dam
g
ed
Power on found out with
no signal
Water full light on
Abnormal Control
Abnormal di
p
sla
y
Connection
p
roblem between
Connetion being
good
Power source
p
roble
Check main pCB
Check if water full
or no
t
Micro switch
p
roble
m
Replace micro
switch
Main PCB damage
Repair and
re
p
lacemen
t
Trouble shooting finish
Repair and
re
p
lacement
Water drainage
Water full after
runnin
g
Checking wiring
Replace
ok
Wat er pump
dama
g
ed
Check electrical
wiring
Wat er pump
dama
g
ed
replacement
Water wheel
p
roblem
Page 30
29
T
r
ouble shootin
g
Trouble shooting for electrical system
no
yes yes
no
yes
yes
no
no
no
yes
yes
no
yes
no
no
no
yes
unit not running
With E1 signal
com
p
ressor off
Power source
120V
Transformer 120V
Transformer 12V
7805 13V input
rate
78055V output
PCB damaged
Power source
Checking fuse
Replacing fuse
Replacing fuse
Fan coil damaged
Senor of fan coil
dama
g
ed
Tran sf or mer
dama
g
ed
Damage in diode
7805 damaged
Main PCB
daa
g
emd
Electrical wiring back to normal
Plug
replac
replac
replac
replac
OK
Fuse damaged
With E1 signal
com
p
ressor off
Sensor wire off
Temperature sensor
dama
g
ed
Plug in
replacement
Page 31
PARTS GUIDE
AMC-15A
MOBILE
SERIES
Page 32
Page 33
Exploded view of model AMC-15A
Page 34
No Description Part Code
Note
Price Code
1 PACKING BOTTOM PSF 410284-0Y-1 AH
2 WHEEL TWP 290025-00XY-H AC
3 BASE 210523-BY-1 AU
4 RUBBER STOPPER 310025-0Y-1 AB
5 COMP, 44A293AJ-FEKC 700167-00-1 BM
6 PARTITION 210524-FY-1 AL
7 FRONT PANEL 210574-0Y-1-H-2 AK
8 UPPER COVER-FRONT (COLD AIR)
210575-0Y-1-H
AG
9 OUTLET FOR COLD AIR
210578-0Y-4-H
AF
10 STRAINER 740007-30XY AL
11 CAPILLARY 1.0x2.2xL500 780203-0Y-14 AR
12 CAPILLARY, 1.0x2.2xL550 780203-0Y-37 AR
13 DISCHARGE TUBE
780222-BY-4
AG
14 CONDENSER 710156-CY-3 BL
15 SUCTION TUBE 780223-0Y-7 AK
16 EVAPORATOR 710157-0Y-4 BK
17 Horizontal blade 210534-0Y-3-H AC
18 Join for horizontal blade 210580-0Y-3-H AC
19 LEFT SIDE PLATE 210527-AY-1-H AH
20 COND FILTER 210533-AY-12-H AH
21 EVA FILTER 210532-AY-12-H AH
22 HOUSING BLOWER,LEFT BOTTOM 410330-0Y-1 AP
23 WHEEL BLOWER φ215x95 ABS+GF 210631-0Y-2 AN
24 HOUSING BLOWER,RIGHT BOTTOM 410331-0Y-1 AP
25 HOUSING BLOWER,LEFT TOP 410254-0Y-1-X AP
26 WHEEL BLOWER φ215x95 ABS 210631-0Y-1 AM
27 HOUSING BLOWER,RIGHT TOP 410253-AY-1-X AP
28 CAP, 3.0uFx450VAC 730049-00XY AE
29 CAP, 3.5uF 450V 730052-0Y-1 AE
30 MOTOR BRACKET 110276-0Y-1 AH
31 OUTER MOTOR 720071-0Y-3-AL BA
32 INNER MOTOR 720078-0Y-3-AL AZ
33 DISPLAY PCB 800145-BY-1-Q AS
34 CONTROL PANEL 210577-0Y-1-H AL
35 PACKING TOP PSF 410283-0Y-1 AH
36 MAIN PCB 800161-0Y-4-5-Q AX
37 Clip for capacitor 190004-0B4Y AB
38 CAPACITOR,30uF 450VAC 730002-20XY AP
39 OUTLET FOR HOT AIR,RIGHT 210537-AY-1 AF
40 OUTLET FOR HOT AIR,LEFT 210536-BY-1 AF
41 UPPER COVER-BACK (HOT AIR) 210576-0Y-1-H AG
42 PIPE OUTER ,Φ150mm 210581-0Y-2 AD
43 PIPE EXHAUST, φ150mm 290008-A0XY AN
44 OUTLET FOR HOT AIR 210579-0Y-4-H AG
45 WHEEL WATER 210186-0BAY AL
46 COVER FOR WATER MOTOR 210538-AY-1 AD
47 WATER MOTOR , 230V/50Hz 720075-BY-3 AX
48 SWITCH, KW3A-16ZA2-C075 16A 750035-0Y-1 AL
49 FLOATER 220001104Y AC
50 wire holder-bottom 210467-AY-3 AC
51 MAIN BRACKET 110196-AY-1 AD
52 RIGHT SIDE PLATE 210526-AY-1-H AH
53 Back PANEL 210574-0Y-1-H-2 AH
54 REMOTE CONTROLLER 800032-0Y-32-K AT
55 Control panel receiver 400MM 800180-0Y-1-A AK
56 Cover top 310029-0Y-1 AB
POWER CORD 760043-0Y-3-1 AF
CARTON
610077-0Y-11 AL
PVC transparent tube xΦ19xL600 230007-80XY AB
MODEL: AMC-15A
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