Midea MSR1-24HRDN1-QC2W, MOF-24HDN1-QC2W, MSR1-18HRDN1-QC2, MSR1-18HRDN1-QCE Service Manual
Page 1
SERVICE MANUAL
MIDEA AIRCONDITIONER
DC INVERTER
SPLIT WALL-MOUNTED TYPE
MSR1-24HRDN1-QC2W
V1.0
Mar., 2010
Page 2
CONTENTS
1. Precaution ................................................................................................................................................. 1
1.1 Safety Precaution ................................................................................................................................................ 1
1.2 Warning ............................................................................................................................................................... 1
2. Function .................................................................................................................................................... 4
3. Dimension ................................................................................................................................................. 6
3.1 Indoor Unit ........................................................................................................................................................... 6
3.2 Outdoor Unit ........................................................................................................................................................ 6
4. Specification ............................................................................................................................................. 7
5. Refrigerant cycle diagram ....................................................................................................................... 8
6. Wiring diagram ......................................................................................................................................... 9
6.1 Indoor Unit ........................................................................................................................................................... 9
6.2 Outdoor Unit ...................................................................................................................................................... 10
7. Installation details ................................................................................................................................... 11
7.1 Wrench torque sheet for installation .................................................................................................................. 11
7.2 Connecting the cables ....................................................................................................................................... 11
7.3 Pipe length and the elevation ............................................................................................................................ 11
7.4 Air purging of the piping and indoor unit ............................................................................................................ 11
7.5 Pumping down (Re-installation) ......................................................................................................................... 13
7.6 Re-air purging (Re-installation) .......................................................................................................................... 14
7.7 Balance refrigerant of the 2-way, 3-way valves ................................................................................................. 15
7.8 Evacuation ......................................................................................................................................................... 16
7.9 Gas charging ..................................................................................................................................................... 17
8. Electronic function ................................................................................................................................ 18
8.1 Abbreviation ...................................................................................................................................................... 18
8.2 Display function ................................................................................................................................................. 18
8.3 Protection .......................................................................................................................................................... 18
8.4 Fan-Only Mode .................................................................................................................................................. 19
8.5 Cooling Mode .................................................................................................................................................... 19
8.6 Drying mode ...................................................................................................................................................... 21
8.7 Heating mode .................................................................................................................................................... 22
8.8 Auto mode function ............................................................................................................................................ 25
8.9 Forced operation function .................................................................................................................................. 25
8.10 Action of 4-way valve ....................................................................................................................................... 25
8.11 Two speeds outdoor fan function ..................................................................................................................... 25
8.12 Timer function .................................................................................................................................................. 26
8.13 Sleep function mode ........................................................................................................................................ 26
8.14 Auto-Restart function ....................................................................................................................................... 26
9. Troubleshooting ..................................................................................................................................... 27
9.1 Indoor Unit Error Display ................................................................................................................................... 28
9.2 Diagnosis and Solution ...................................................................................................................................... 29
9.3 Key parts checking. ........................................................................................................................................... 32
Page 3
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people
and property damage, the following instructions
must be followed.
Incorrect operation due to ignoring
instruction will cause harm or damage.
Before service unit, be sure to read this
service manual at first.
1.2 Warning
Installation
Do not use a defective or underrated circuit
breaker. Use this appliance on a dedicated
circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller,
a qualified electrician, or an Authorized service
center.
Do not disassemble or repair the product, there is
risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control
box securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and
breaker.
Improper wiring or installation may cause fore or
electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit
by yourself (customer).
There is risk of fire, electric shock, explosion, or
injury.
Be caution when unpacking and installing
the product.
Sharp edges could cause injury, be especially
careful of the case edges and the fins on the
condenser and evaporator.
For installation, always contact the dealer or
an Authorized service center.
There is risk of fire, electric shock, explosion, or
injury.
Do not install the product on a defective
installation stand.
It may cause injury, accident, or damage to the
product.
Be sure the installation area does not
deteriorate with age.
If the base collapses, the air conditioner could fall
with it, causing property damage, product failure,
and personal injury.
Do not let the air conditioner run for a long
time when the humidity is very high and a door
or a window is left open.
Moisture may condense and wet or damage
furniture.
Take care to ensure that power cable could
not be pulled out or damaged during operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply
plug during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with
wet hands.
There is risk of fire or electric shock.
Do not place a heater or other appliance
near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric
shock.
Do not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed
space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas
and open a window for ventilation before turn the
product on.
Do not use the telephone or turn switches on or off.
There is risk of explosion or fire.
If strange sounds, or small or smoke comes
from product. Turn the breaker off or disconnect
the power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in
storm or hurricane. If possible, remove the
product from the window before the hurricane
1
Page 4
arrives.
There is risk of property damage, failure of product,
or electric shock.
Do not open the inlet grill of the product
during operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or
product failure.
When the product is soaked (flooded or
submerged), contact an Authorized service
center.
There is risk of fire or electric shock.
Be caution that water could not enter the
product.
There is risk of fire, electric shock, or product
damage.
Ventilate the product from time to time
when operating it together with a stove, etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or
maintaining the product.
There is risk of electric shock.
When the product is not be used for a long
time, disconnect the power supply plug or turn
off the breaker.
There is risk of product damage or failure, or
unintended operation.
Take care to ensure that nobody could step
on or fall onto the outdoor unit.
This could result in personal injury and product
damage.
CAUTION
Always check for gas (refrigerant) leakage
after installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is
drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoid vibration of water leakage.
Do not install the product where the noise
or hot air from the outdoor unit could damage
the neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and transport
the product.
Avoid personal injury.
Do not install the product where it will be
exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion,
particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient
operation.
Operational
Do not expose the skin directly to cool air
for long periods of time. (Do not sit in the draft).
This could harm to your health.
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.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
It may cause product failure.
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the
plastic parts of the product.
Do not touch the metal parts of the product
when removing the air filter. They are very sharp.
There is risk of personal injury.
Do not step on pr put anything on the
product. (outdoor units)
There is risk of personal injury and failure of product.
Always insert the filter securely. Clean the
filter every two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air
conditioner and could cause product malfunction or
damage.
Do not insert hands or other object through
air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause
personal injury.
Do not drink the water drained from the
product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or
maintaining the product.
Be careful and avoid personal injury.
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.
There is risk of fire or explosion.
Do not recharge or disassemble the
batteries. Do not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto
2
Page 5
your skin or clothes, wash it well with clean
Do not use the remote of the batteries have
leaked.
The chemical in batteries could cause burns or other
health hazards
3
Page 6
2. Function
Indoor unit
Operation by remote controller
Sensing by room temperature
Room temperature sensor.
Pipe temperature sensor.
Room temperature control
Maintain the room temperature in accordance with the
setting temperature.
Anti-freezing control in cooling
Prevent the water being frozen on evaporator by sensing
the evaporator pipe temperature in cooling mode
Time Delay Safety control
Restarting is for approx. 3 minutes..
Indoor fan speed control
Turbo wind, high, med, low, breeze.
Two-direction air vane
The unit will decide the louver direction according to
operation mode.
Sleep mode auto control
The fan is turn to low speed (cooling/heating).
The unit will be turn off at the seventh hour.
Independent dehumidification
The function is usually used in rainy days in
springtime or damp areas.
Air flow Direction control
Timer function
Self-diag. function
Anti-cold function
Prevent the cold wind at the
beginning of unit start.
Auto defrost
The louver can be set at the desired position or
swing up and down automatically
Auto mode
The mode can be change by the room temperature.
Temp. Compensation
4
Auto-restart function
When the power supply is
interrupted and then restore, the air
conditioners automatically restore
the previous function setting.
Flexible wiring connection
Page 7
Outdoor unit
Power relay control
The unit has 3 mins delay between continuously ON/OFF operations.
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more quietly.
Hydrophilic aluminum fin
The hydrophilic fin can improve the heating efficiency at operation mode.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Made from electrolytic zinc steel sheet and anti-rust coated components.
Valve protection cover
It protects the valves and prevents water from dripping.
Discharge pipe temperature protect
Driving heating at -15
5
Page 8
3. Dimension
3.1 Indoor Unit
Dimension
Model
W H D
24k 1030 313 221
3.2 Outdoor Unit
MOF-24HDN1-QC2W
6
Page 9
4. Specification
Indoor MSR1-24HRDN1-QC2W
Outdoor MOF-24HDN1-QC2W
Power supply Ph-V-Hz 1,220-240V~,50Hz
Max. input consumption W 2950
Max. current A 13.5
Model
Type Twin-rotary DC inverter
Brand Toshiba
Compressor
Indoor fan motor
Indoor air flow (Hi/Mi/Lo) m3/h 1120/950/880
Indoor noise level (Hi/Mi/Lo) dB(A) 48/45/41
Indoor unit
Outdoor fan motor
Outdoor air flow m3/h 2500
Outdoor noise level dB(A) 58
Outdoor unit
Refrigerant type R410A g 1950
Design pressure MPa 4.2
Refrigerant piping
Operation temp ℃ 17 ~ 30
Ambient temp ℃ -15 ~ 50
Application area m2
Capacity Btu/h 15286
Input W 1150
Rated current(RLA) A 9.7
Refrigerant oil ml 500
Model
Brand Welling
Input W 72/70/54
Capacitor uF 3
Speed(hi/mi/lo) r/min 1210/1020/950
Dimension (W*H*D) mm
Packing (W*H*D) mm 1135 × 435 × 315
Net/Gross weight Kg 14、19
Model
Brand Welling
Input W 103/76
Capacitor uF 2.5
Speed r/min 840/630
Dimension(W*H*D) mm
Packing (W*H*D) mm 965*755*395
Net/Gross weight Kg 49.5/52.5
Liquid side/ Gas side mm
Max. refrigerant pipe length m 25
Max. difference in level m 10
The above design and specifications are subject to change without prior notice for product improvement.
DA150S1C-20FZ
YDK36-4C(A)
1030 × 313 × 221
YDK55-6G
845*695*335
Ф9.53/Ф16.0
40 ~ 56
7
Page 10
5. Refrigerant cycle diagram
8
Page 11
6. Wiring diagram
6.1 Indoor Unit
9
Page 12
6.2 Outdoor Unit
10
Page 13
7. Installation details
7.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kgf.m
Ф9.52 3/8 4.2
Ф16.0 5/8 6.6
7.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 9K 12K 18K 24K
mm2 1.5 1.5 2.5 2.5
7.3 Pipe length and the elevation
Capacity
Btu/h
24K 5/8’’ (Ф16.0) 3/8’’ (Ф9.52) 5 10 25 40
Caution:
Capacity is based on standard length and maximum allowance length is base of reliability.
Oil trap should be installed per 5-7 meters.
Pipe size
Gas Liquid
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
7.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will affect the
compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gas
11
Page 14
leakage from the refrigeration cycle.
Procedure
1. Recheck the piping connections.
2. Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait 10
seconds, and then set it to closed position.
Be sure to use a hexagonal wrench to operate the
valve stem.
3. Check for gas leakage.
Check the flare connection for gas leakage
4. Purge the air from the system.
Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then wait
for one minute.
5. Use torque wrench to tighten the service port cap
to a torque of 1.8 kgf.m. (18N.m)
6. Set the 3-way valve to the opened position.
7. Mounted the valve stem nuts to the 2-way and
3-way valves.
8. Check for gas leakage.
At this time, especially check for gas leakage from
the 2-way and 3-way stem nuts, and from the
service port.
Caution:
If gas leakage is discovered in step (3) above, take the
following measures.
If the leaks stop when the piping connections are
tightened further, continue working from step (4).
If the gas leaks do not stop when the connections are
retightened, repair the location of the leak, discharge all
of the gas through the service port, and then recharge
with the specified amount of gas from a gas cylinder.
12
Page 15
7.5 Pumping down (Re-installation)
Procedure
1. Confirm that both the 2-way and 3-way valves are set to the opened position.
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve.
Connect the charge hose with the push pin to the gas service port.
5. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
6. Set the 2-way valve to the close position.
7. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
8. Immediately set the 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service port caps.
Use a torque wrench to tighten the service port cap to a torque of 1.8 kgf.m.
Be sure to check for gas leakage.
13
Page 16
7.6 Re-air purging (Re-installation)
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the closed position.
2. Connect the charge set and a charging cylinder to the service port of the 3-way valve.
Leave the valve on the charging cylinder closed.
3. Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way
valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut to on the 2-way valve.
4. Check the gas leakage.
Check the flare connections for gas leakage.
5. Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicates 0.3 to 0.5 Mpa.
6. Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position.
Be sure to use a hexagonal wrench to operate the valve stems.
7. Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
Be sure to check the gas leakage.
14
Page 17
7.7 Balance refrigerant of the 2-way, 3-way valves
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the open position.
2. Connect the charge set to the 3-way valve’s service port.
Leave the valve on the charge set closed.
Connect the charge hose with the push pin to the service port.
3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge indicates 0.05 to
0.1Mpa.
If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is higher than 0.1Mpa,
discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the case, it will not be necessary to
apply a evacuation.
Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be discharged.
15
Page 18
7.8 Evacuation
Procedure:
1. Connect the vacuum pump to the charge set’s centre hose.
2. Evacuation for approximately one hour.
Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less].
3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning off the vacuum pump).
4. Disconnect the charge hose from the vacuum pump.
Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needle.
16
Page 19
7.9 Gas charging
Procedure:
1. Connect the charge hose to the charging cylinder.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.
2. Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
If the system cannot be charge with the specified amount of refrigerant, if can be charged with a little at a time
(approximately 150g each time0 while operating the air conditioner in the cooling cycle; however, one time is not
sufficient, wait approximately 1 minute and then repeat the procedure.(pumping down-pin).
4. Immediately disconnect the charge hose from the 3-way valve’s service port.
Stopping partway will allow the refrigerant to be discharged.
If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner
before disconnecting the hose.
5. Mounted the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
17
Page 20
8 Electronic function
8.1 Abbreviation
T1: Indoor ambient temperature
T2: Pipe temperature of indoor heat exchanger
T3: Pipe temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
8.2 Display function
8.2.1 Icon explanation on indoor display board.
①
This indicator illuminates when the air conditioner is in AUTO operation.
②
This indicator illuminates when TIMER is set ON/OFF.
③
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air
control feature is activated in heating mode.
④
This indicator illuminates when the air conditioner is running.
8.2.2 LED display control function.
Pressing “LED display” button on remote controller will turn off all displays on indoor unit, while pressing once
again, all displays will resume.
Auto indicator
Timer indicator
PRE.-DEF. Indicator
OPERATION indicator
8.3 Protection
8.3.1 Protection of compressor top temperature.
When the Over-load Protector is cut due to too high temperature of compressor top, the unit will stop. When
the Over-load Protector is closed again due to decreasing of compressor top temperature, the unit will restart( in
this case the compressor is restricted by Three Minutes Delay protection).
8.3.2 Protection of discharge temperature (Td).
1) Compressor will stop immediately if Td>115 for 5s.
2) If 90≤Td≤115, compressor will run with restricted frequency.
3) If Td<90℃, compressor will restart or run without restricted frequency
8.3.3 Three Minutes Delay at restart for compressor.
It will take 3 minutes every time when compressor starts.
18
Page 21
It will take only 1 minute when the unit is powered on at first time.
8.3.4 Temperature sensor protection at open circuit or short circuit.
8.3.5 Inverter module Protection.
Inverter module has a protection function against current, voltage and temperature. If these protections
happened, the unit will stop and LED display error code .
8.3.6 Indoor fan delayed open function.
When the unit is turned on at all modes, the indoor fan will operate 10 seconds later than the action of louver.
8.3.7 Compressor preheating function.
1) Preheating permitting condition:
If T4(outdoor ambient temperature)＜3℃ and the machine connects to power supply newly or if T4＜3℃
and compressor has stopped for over 3 hours, the compressor heating cable will work.
2) Preheating mode:
A weak current flows through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
3) Preheating release condition:
If T4＞5℃ or user turns on the machine and compressor runs, preheating function will stop.
8.3.8 Compressor heating cable
If outdoor temperature is lower than 5℃, the compressor heating cable begins to work. If outdoor temperature is
higher than 15℃, the compressor heating cable stops working.
8.4 Fan-Only Mode
8.4.1 Temperature setting function is disabled, and no setting temperature display.
8.4.2 In this mode, the action of louver is the same as in cooling mode.
8.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24℃ setting temperature.
3.5
3.0
1.5
T1 – 24
1.0
high
medium
low
8.5 Cooling Mode
8.5.1 After starting, the operation frequency of compressor submits to following rule.
19
Page 22
A
1.5
1.0
B
0.5
-0.5
-1.0
∆T=(room temp) – (setting Temp)
C
D
When the machine is running and ∆T(=room temp. – setting temp.) changes, the frequency of compressor will
rise or descend a grade (7 minutes after starting).
After starting, if ∆T stays in a zone for 3 minutes, the frequency will change as follow:
Zone A : Current frequency rise a grade till the maximum grade F8.
Zone B: Keep the current frequency of compressor.
Zone C: Descend the current frequency of compressor until F1.
Zone D: Compressor stops after running as the minimum frequency F1 for 60 minutes or ∆T is less than -2℃.
8.5.2 Indoor heat exchanger anti-freezing function.
If T2 is lower than 0℃, the compressor stops and resumes when T2>5℃.
8.5.3 Outdoor unit current control in cooling mode(refer to the parameter table)
I3COOL
comp. pause
I2COOL
I1COOL
outdoor unit current
8.5.4 Rating capacity test function
1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press “TURBO” button on
controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine
will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously. Also,
indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. Any
condition of above is not satisfied, the machine can not be turned into rating capacity test mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or
setting temperature.
8.5.5 Turbo function(press the “TURBO” button on remote controller)
1) Elevate current frequency to a higher grade.
2) Indoor fan turns to turbo speed.
3) After running for 30 minutes the machine will turn back to previous setting mode.
8.5.6 Indoor fan operation rule.
1) In cooling mode, indoor fan runs all the time and the speed can be selected as high,
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
20
Page 23
medium, low and auto.
2) Auto fan in cooling mode acts as follow:
4.0
3.0
1.5
1.0
8.5.7 Condenser high temperature protection function(in cooling and drying mode)
If T3＞60℃ for 5 seconds, compressor will stop immediately, and the machine will not resume until T3＜52℃.
∆T=(oom temp) – (setting Temp)
high
medium
low
8.6 Drying mode
8.6.1 Indoor fan speed is fixed at breeze grade and can’t be changed. The horizontal angle is the same as in cooling
mode.
8.6.2 Room overlow temperature protection
In drying mode, if room temperature is lower than 10℃, compressor will stop and not resume until room
temperature climbs up to 12℃.
8.6.3 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are
valid, and they are the same as that in cooling mode.
8.6.4 Horizontal louver action is the same as that in cooling mode.
21
Page 24
8.7 Heating mode
8.7.1 Indoor fan action:
1) Anti-cold-wind function.
8.7.2 Indoor fan speed can be set as high, medium, low or auto grade, but anti-cold-wind function is preferential.
2) If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127
seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is
available.
3) If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and
anti-cold-wind is disabled.
Auto fan action in heating mode.
2.5
2.0
1.5
1.0
∆T=(oom temp) – (setting Temp)
low
medium
high
8.7.3 After start the operation frequency of compressor submits to following rule:
5.0
4.5
3.5
3.0
2.5
∆Th=(room temp) – (setting Temp)
D
C
B
A
When the machine runs, if ∆Th stays in a zone for 3 minutes, action of frequency is as follow:
Zone A: Elevate the current frequency one grade, and not stop until the maximum grade.
Zone B: Keep the current frequency.
Zone C: Descend the current frequency one grade.
22
Page 25
Zone D: Compressor stops after running with F1 for 60 minutes or when ∆Th＞6℃.
8.7.4 Outdoor unit current control in heating mode.
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
outdoor unit current
I3HEAT
I2HEAT
I1HEAT
8.7.5 Indoor heat exchanger high temperature protection.
If T2＞60℃, the compressor will stop and not resume until T2＜48℃.
9.7.6 Defrosting mode
1) Condition of defrosting.
Condition 1: If T4＞0℃,
When the units are running, if the following two items are satisfied the units start defrosting:
a) The units runs with T3＜3℃ for 40 minutes and T3 keeps lower than -6℃ for more than
3 minutes.
b) The units runs with T3＜3℃ for 80 minutes and T3 keeps lower than -4℃ for more than
3 minutes.
Condition 2: If T4＜0℃,
The program judges according to the condition 1, if the two items are satisfied, then judges if T2 has
descended for more than 5℃, if it has the machine starts defrosting, or continues to judge T2 and will
not defrost until T2 drops more than 5℃.
Condition 3: No matter what value T4 is, if the machine runs with T3＜3℃ for more than 120 minutes and T3
keeps lower than -2℃ for more than 3 minutes, the machine will defrost, no matter if T2 drops for more than 5℃
or not.
2) Condition of ending defrosting.
If any one of following items is satisfied, defrosting will finish and the machine will turn to normal heating
mode.
a) T3 rises to be higher than 12℃.
b) T3 rises to be higher than 8℃ and remains for 80 seconds.
c) The machine has run for 10 minutes in defrosting.
8.7.7 Defrosting action
23
Page 26
F8
compressor
on
off
4-way valve
outdoor fan
indoor fan
indoor fan breeze 10s
on
off
on
off
on
off
90s
100s
no longer than 10 minutes
30s
8.7.8 Rating capacity test function
1) Set the indoor unit with remote controller as: high fan, 30℃ in heating mode, then press “TURBO”
button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the
machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds
continuously. Also, indoor fan will change to rating speed, the frequency of compressor will be fixed as
rating value. Any condition of above is not satisfied, the machine can not be turned into rating capacity test
mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan
speed or setting temperature.
8.7.9 Turbo function in heating mode
Elevate current frequency(excluding F8) to a higher grade. If indoor fan is in low speed or pause caused by
defrosting or anti-cold-wind function, frequency of compressor will not be elevated one grade until these limit
has been released.
1) Indoor fan changes to turbo speed and anti-cold-wind function is valid.
2) After running for 30 minutes the machine will turn back to previous setting mode.
24
Page 27
8.8 Auto mode function
8.8.1 This mode can be chosen with remote controller and the setting temperature can be changed between 17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to ∆T(∆T =T1-Ts).
∆T=T1-Ts Running mode
∆T＞1℃
-1≤∆T≤1℃
∆T＜-1℃
Cooling
Fan-only
Heating
8.8.2 Indoor fan will choose auto speed of relevant mode.
8.8.3 If the machine switches mode between heating and cooling, compressor will keep stopping for 15 minutes and
then rechoose mode according to ∆T.
8.8.4 If the setting temperature is modified, the machine will rechoose running function.
8.9 Forced operation function
8.9.1 Forced cooling and auto function can carry out with a touch button. In these two modes, the machine can be
changed by remote controller to any other mode at any moment.
8.9.2 When the machine is off, pressing the touch button once, the unit will enter forced auto mode. When the
machine is off, pressing the touch button twice within 5s, the unit will enter forced cooling mode. When the unit is
running at forced auto or forced cooling mode, pressing the touch button continuously, the unit will be turned off.
8.9.3 In forced operation mode, all general protections is available.
8.9.4 In forced cooling mode, the unit will run with fixed frequency F2 at low speed. 30 minutes later, the unit will turn
to normal auto mode with setting temperature 24℃.
8.9.5 In forced auto mode, the unit will run with setting temperature 24℃.
8.10 Action of 4-way valve
In cooling, drying, fan-only, or turning off mode, 4-way valve is off, while in heating mode 4-way valve is on. If the
unit changes operation mode, 4-way valve will be delayed off 2 minutes after compressor stop. For defrosting,
please refer to the passage “defrosting mode”.
8.11 Two speeds outdoor fan function
8.11.1 Outdoor fan starts at the same time with compressor, but stops 30 seconds later after compressor stop.
8.11.2 Outdoor fan action in heating mode(including heating in auto mode).
℃
17
15
outdoor temperature
Outdoor fan action in heating mode
(including heating in auto mode).
low
high
outdoor fan speed
8.11.3 Outdoor fan action in cooling & drying mode(including cooling in auto & forced mode).
Please refer to the pic. above.
℃
22
20
outdoor temperature
Outdoor fan action in cooling & drying mode
(including cooling in auto & forced mode).
high
low
outdoor fan speed
25
Page 28
8.12 Timer function
8.12.1 Timing range is 24 hours, and the minimum resolution is 15 minutes.
8.12.2 Timer on. After turning off, the machine will turn on automatically when reaching the setting time.
8.12.3 Timer off. After turning on, the machine will turn off automatically when reaching the setting time.
8.12.4 Timer on/off. After turning off, the machine will turn on automatically when reaching the setting “on” time, and
then turn off automatically when reaching the setting “off” time.
8.12.5 Timer off/on. After turning on, the machine will turn off automatically when reaching the setting “off” time, and
then turn on automatically when reaching the setting “on” time.
8.12.6 The tolerance of Timer is 1 minute per hour.
8.13 Sleep function mode
8.13.1 Operation time in sleep mode is 7 hours. After 7 hours the machine quits this mode and turns off.
8.13.2 In cooling, heating or auto mode sleep function is available.
8.13.3 Operation process in sleep mode is as follow:
1) After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.
2) When cooling, the setting temperature rises 1℃(be lower than 30℃) every one hour, 2 hour later the
rising stops and indoor fan is fixed as low speed.
3) When heating, the setting temperature descends 1℃(be lower than 30℃) every one hour, 2 hour later
the descending stops and indoor fan is fixed as low speed, and anti-cold-wind is available.
8.13.4 If user uses timer on function in sleep mode, sleep function will pause and not resume until reaches the setting
on time.
8.13.5 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the timing time is less
than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing time is more than 7
hours, the machine will not stop until reaches the setting off time in sleep mode.
8.14 Auto-Restart function
The indoor unit is equipped with auto-restart function. In case of a sudden power failure, the setting conditions
before the power failure will be restored. The unit will resume the previous operation setting automatically after 3 minutes
when power returns.
26
Page 29
9. Troubleshooting
Safety
Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply,
electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor.
Electrolytic Capacitors
(HIGH VOLTAGE! CAUTION!)
Bulb (25-40W)
27
Page 30
9.1 Indoor Unit Error Display
Display LED STATUS
E0 EEPROM parameter error
E1 Indoor / outdoor units communication protection
E5 Open or short circuit of outdoor temperature sensor
E6 Open or short circuit of indoor temperature sensor
P0 Inverter module over-strong current protection
P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top.
P4 Inverter compressor drive error
28
Page 31
9.2 Diagnosis and Solution
9.2.1 E0(EEPROM parameter error) error diagnosis and solution
Circuit or software error on indoor PCB
9.2.2 E1(indoor / outdoor units communication protection) error diagnosis and solution
Disconnect the power supply, after 1 minute,
connect the power supply, turn on the unit with
remote controller
Does the unit work normally?
NO
Check the wiring between
indoor and outdoor unit. Is
the connection of L, N, S and
GND good?
Is the GND connection on
outdoor PCB good?
Is the LED4 (red) on
outdoor PCB bright and
LED1(yellow) blinking?
Replace indoor PCB
Reconnect and retest again
Replace indoor PCB
and repower on. Is
the failure cleared?
The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?
Correct the connection.
9.2.3 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
Is the outdoor temperature
sensor connector and
connection good?
YES
Replace the sensor and
check if E5 display again?
NO
YES
9.2.4 E6(open or short circuit of indoor temperature sensor) diagnosis and solution.
Replace outdoor e-box.
Repair the connector and
reconnect
Replace outdoor e-box
29
Page 32
Is the indoor temperature
and evaporator sensor
connector and connection
good?
YES
NO
Repair the connector and
reconnect
Replace the sensor and
check if E6 display again?
YES
9.2.5 P0(Inverter module over-strong current protection) diagnosis and solution.
Is all connections on PCB
and between PCB and
compressor good?
YES
Replace the outdoor PCB
and then repower on. Is
the failure cleared?
NO
NO
9.2.6 P1(over voltage or too low voltage protection) diagnosis and solution.
Is the power supply good?
YES
NO
Replace the indoor PCB
Repair or correct the
connector or connection.
Check the compressor
Be sure the power supply is
normal when using the units
9.2.7 P2(temperature protection of compressor top) diagnosis and solution.
Replace the outdoor e-box.
30
Page 33
p
gging
)
Does compressor
o
erate?
YES
Is refrigerant
circulation
volume normal?
NO
Charge refrigerant
NO
Is the connection
good?
YES
Is protector
normal?
YES
Check the outdoor
main PCB. Is there
some problem?
YES
Is abnormality
the same after
gas charging?
NO
9.2.8 P4(inverter compressor drive error) diagnosis and solution.
NO
NO
Reconnect and retest.
Replace the protector.
Replace the outdoor PCB.
Check refrigerant system (such
as clo
of capillary, etc
Is the connection of
compressor good? Is the
wiring sequence right? The
voltage range proper?
NO
Reconnect and retry
YES
Replace the outdoor E-box.
If the problem comes to
again, check coil resistance
of inverter compressor, is it
NO
Replace inverter compressor
31
Page 34
9.3 Key parts checking.
9.3.1. Compressor checking (Model: DA150S1C-20FZ)
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Blue - Red
Blue - Black
Red - Blue
9.3.2 Outdoor Fan Motor (Model: YDK55-6G)
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Black - Red
0.95Ω
(20Ԩ)
191Ω (20Ԩ)
Red -Yellow
Red -Blue
32
191Ω (20Ԩ)
220Ω (20Ԩ)
Page 35
9.3.4 Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor exhaust temp.(Te) sensor.
Measure the resistance value of each winding by using the multi-meter.
Some frequently-used R-T data for T1, T2, T3 and T4 sensor:
Temperature () 5 10 15 20 25 30 40 50 60
Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4
Some frequently-used R-T data for Te sensor:
KΩ
Temperature (Ԩ)
Resistance Value (KΩ) 141.6 88 56.1 36.6 13.8 8.7 6.9 5 3.7
5 15 25 35 60 70 80 90 100
Ԩ
33
Loading...