Bosch BMS500-AAU009-0AHXXA User manual

Bosch Split-Type Ductless Air Conditioner / Heat Pump
Climate 5000 AA Series
Service Manual

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
Data subject to change

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Bosch Thermotechnology Corp. |02.2018 Data subject to change
TableofContents
1 Key to Symbols and Safety Instructions 4
1.1 Keytosymbols 4
1.2 Safety 4
2 Part Names and Model Numbers 6
2.1 Modelnumbers 6
2.2 Unitparts 6
3 Dimensions 7
3.1 Indoorunit 7
3.2 Outdoor unit 9
4 Refrigerant Cycle Diagram 10
5 Wiring Diagram 12
6 Installation Details 12
6.1 Wrench torque sheetforinstallation 12
6.2 Connectingthecables 12
6.3 Pipelengthandtheelevation 12
6.4 Firsttimeinstallation 12
6.5 Addingthe refrigeranttoanexistingsystem 13
6.6 Re-installation/indoorunitneedstobe repaired 13
6.7 Re-installationwhiletheoutdoor unit needstoberepaired 14
6.8 Operationcharacteristics 15
7 Electronic Functions 16
7.1 Abbreviation 16
7.2 Displayfunction 16
7.3 Mainprotection 16
7.4 Operationmodesandfunctions 17
8 Troubleshooting 22
8.1 Indooruniterrordisplay 23
8.2 Outdooruniterrordisplay 24
8.3 Diagnosisand solution 28
9 Disassembly Guide 50
9.1 Indoorunit 50
9.2 Outdoorunit 55
10 Care and Maintenance 70
10.1 Cleaningprecautions 70
10.2 Cleaningyourair Àlter 70
10.3 AirÀlterreminders(optional) 71
10.4 Maintenance–longperiodsof non-use 71
10.5 Maintenance –pre-season inspection 71

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
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1 KeytoSymbolsandSafety Instructions
1.1 Keytosymbols
Warnings
Warnings in this document are identified by a
warning triangle printed against a grey background.
Keywords at the start of a warning indicate the type and seriousness
of the ensuing risk if measures to prevent the risk are not taken.
The following keywords are defined and can be used in this document:
fDANGER indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
fWARNINGindicates a hazardous situation which, if not avoided, could
result in death or serious injury.
fCAUTION indicates a hazardous situation which, if not avoided, could
result in minor to moderate injury.
fNOTICEis used to address practices not related to personal injury.
Importantinformation
This symbol indicates important information where
there is no risk to people or property.
1.2 Safety
Pleasereadsafetyprecautionsbeforeinstallation
WARNING:
fThe information contained in the manual is intended for
use by a qualified service technician familiar with safety
procedures and equipped with the proper tools and test
instruments.
fRepairs made by unqualified persons can result in hazards to
you and others.
WARNING:
fDo not modify the length of the signal/power cable or use an
extension cord to power the unit.
fDo not share the electrical outlet with other appliances.
Improper or insufficient power supply can cause fire or
electrical shock.
WARNING:
fWhen connecting refrigerant piping, do not let substances or
gases other than the specified refrigerant enter the unit. The
presence of other gases or substances will lower the unit’s
capacity, and can cause abnormally high pressure in the
refrigeration cycle. This can cause explosion and injury.
WARNING:
fInstallation MUST conform with local building codes or, in
the absence of local codes, with the National Electrical Code
NFPA70/ANSI C1-1993 or current edition and Canadian
Electrical Code Part1 CSA C.22.1.
WARNING:
fFailure to carefully read and follow all instructions in this
manual can result in equipment malfunction, property
damage, personal injury and/or death.

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WARNING:ELECTRICAL
fFor all electrical work, follow all local and national wiring
standards, regulations, and the Installation Manual.
The power supply to the outdoor unit requires a service
disconnect at the unit. Only use a dedicated circuit. Never
share a power source connected to this system. Insufficient
electrical capacity or defects in electrical work can cause
electrical shock or fire.
fFor all electrical work, use the specified cables. Connect
cables tightly, and clamp them securely to prevent external
forces from damaging the terminal. Improper electrical
connections can overheat and cause fire, and may also cause
shock.
fAll wiring must be properly arranged to ensure that the
control board cover can close properly. If the control board
cover is not closed properly, it can lead to corrosion and
cause the connection points on the terminal to heat up, catch
fire, or cause electrical shock.
fIf the power supply cord is damaged, it must be replaced
by the manufacturer, its service agent or similarly qualified
persons such as a licensed electrician in order to avoid a
hazard.
fThe product must be properly grounded at the time of
installation, or electrical shock may occur.
WARNING:
fDo not install unit in area of high heat such as kitchen, server
rooms, etc.
CAUTION:
fFor units that have an auxiliary electric heater, do not install
the unit within 1 meter (3 feet) of any combustible materials.
fDo not install the unit in a location that may be exposed
to combustible gas leaks. If combustible gas accumulates
around the unit, it may cause fire.
fDo not operate your air conditioner in a wet room such as a
bathroom or laundry room. Too much exposure to water can
cause electrical components to short circuit.
CAUTION:
fInstall condensate drainage piping according to the
instructions in this manual. Improper condensate drainage
may cause water damage to your home and property.
NOTICE:FLUORINATEDGASSES [REFRIGERANT]
fThis air-conditioning unit contains fluorinated gasses. For
specific information on the type of gas and the amount,
please refer to the relevant label on the outdoor unit itself.
fInstallation, service, maintenance and repair of this unit must
be performed by a certified technician.
fProduct removal and recycling must be performed by a
certified technician.
fIf the system has a leak-detection system installed, it must be
checked for leaks at least every 12 months.
fWhen the unit is checked for leaks, proper record-keeping of
all checks is strongly recommended.
NOTICE:FLUORINATEDGASSES [REFRIGERANT]
fAir and moisture in the refrigerant system have undesirable
effects as below:
—Pressure in the system rises.
—Operating current rises.
—Cooling or heating efficiency drops.
—Moisture in the refrigerant circuit may freeze and block
capillary tubing.
—Water may lead to corrosion of parts in the refrigerant
system. Therefore, the indoor units and the pipes
between indoor and outdoor units must be leak tested
and evacuated to remove gas and moisture from the
system.

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
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2 PartNamesandModelNumbers
2.1 Modelnumbers
Capacity Voltage Indoor Units Outdoor Units
9k 115V BMS500-AAU009-0AHXXA BMS500-AAS009-0CSXXA
12k 115V BMS500-AAU012-0AHXXA BMS500-AAS012-0CSXXA
9k 208-230V BMS500-AAU009-1AHXXA BMS500-AAS009-1CSXXA
12k 208-230V BMS500-AAU012-1AHXXA BMS500-AAS012-1CSXXA
18k 208-230V BMS500-AAU018-1AHXXA BMS500-AAS018-1CSXXA
24k 208-230V BMS500-AAU024-1AHXXA BMS500-AAS024-1CSXXA
Table 1
2.2 Unitparts
Figure 1
Wall Mounting Plate
Refrigerant Piping
(Sold Separately)
Signal/power Cable
(32ft cable included with indoor unit)
Remote Control
Drainage Pipe
Louver
Remote Holder
Front Panel
Outdoor Unit
Power Cable
(Required, not included with unit)
Air filter
(pull it out)

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3 Dimensions
3.1 Indoorunit
Figure 2
Model W x D x H (mm) W x D x H (inch) Mounted plate
BMS500-AAU009-0AHXXA
805 x 193 x 302 31.69 x 7.60 x 11.89 B
BMS500-AAU012-0AHXXA
BMS500-AAU009-1AHXXA
BMS500-AAU012-1AHXXA
BMS500-AAU018-1AHXXA 1106 x 232 x 342 43.54 x 9.13 x 13.46 D
BMS500-AAU024-1AHXXA
Table 2

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
Data subject to change
Figure 3
31.7" (805mm)
16.8" (427.9mm)
8.8" (224.6mm)
6.5"(163mm)
11.9" (302mm)
Right rear wall hole
2.5" (65mm)
4.5"
(113mm)
4.4"
(112mm)
2.1" (53mm)
5.1"
(128mm)
1.5"
(39mm)
2.1" (53mm)
Left rear wall hole
2.5" (65mm)
1.1" (27mm)
Indoor unit outline
For mount plate B
Figure 4
43.5" (1106mm)
23.6" (598.4mm)
12.5" (319.5mm)
8.9"(228mm)
1.7" (45mm)
13.5" (342mm)
Right rear wall hole
2.5" (65mm)
7.4"(189mm)
12.5"(319.5mm)
8.9"(227.8mm)
2.1"
(53.7mm)
Left rear wall hole
2.5" (65mm)
1.7" (45mm)
Indoor unit outline
For mount plate D

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3.2 Outdoorunit
Figure 5
More than 60cm(23.6in)
More than 70cm(27.6in)
More than 30cm(11.8in)
More than 60cm(23.6in)
(Service space)
Fence or
obstacles
More than 30cm(11.8in)
Outdoor unit clearances
Figure 6 Outdoor unit dimensions
Model W D H W1 A B
BMS500-AAS009-0CSXXA 30.31 (770) 11.81 (300) 21.85 (555) 33.07 (840) 19.17 (487) 11.73 (298)
BMS500-AAS009-1CSXXA
BMS500-AAS012-0CSXXA 31.50 (800) 13.11 (333) 21.81 (554) 34.25 (870) 20.24 (514) 13.39 (340)
BMS500-AAS012-1CSXXA
BMS500-AAS018-1CSXXA 33.27 (845) 14.29 (363) 27.64 (702) 35.98 (914) 21.26 (540) 13.78 (350)
Table 3 Outdoor unit dimensions in inches (mm)

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
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4 RefrigerantCycleDiagram
Forindoormodels:
BMS500-AAU009-0AHXXA,BMS500-AAU012-0AHXXA,
Foroutdoormodels:
BMS500-AAS009-0CSXXA,BMS500-AAS012-0CSXXA
Figure 7
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGER
COMPRESSOR
LIQUID
SERVICE
VALVE
REVERSING
VALVE
REFRIGERANT
FLOW IN
COOLING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
ACCUMULATOR
INDOOR OUTDOOR
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
GAS
SERVICE
VALVE
REFRIGERANT
FLOW IN
HEATING
HEAT
EXCHANGER
Refrigerant cycle diagram

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Forindoormodels:
BMS500-AAU009-1AHXXA,BMS500-AAU012-1AHXXA,
BMS500-AAU018-1AHXXA,BMS500-AAU024-1AHXXA,
Foroutdoormodels:
BMS500-AAS009-1CSXXA,BMS500-AAS012-1CSXXA
BMS500-AAS018-1CSXXA,BMS500-AAS024-1CSXXA
Figure 8
LIQUID SIDE
GAS SIDE
Compressor
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
INDOOR OUTDOOR
Accumulator
Electronic
expansion valve
REFRIGERANT
FLOW IN
COOLING
REFRIGERANT
FLOW IN
HEATING
HEAT
EXCHANGER
LIQUID
SERVICE
VALVE
REVERSING
VALVE
GAS
SERVICE
VALVE
HEAT
EXCHANGER
Refrigerant cycle diagram

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02.2018 |Bosch Thermotechnology Corp.
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5 WiringDiagram
Refer to wiring diagram in the installation manual (IOM) or on the unit.
6 InstallationDetails
6.1 Wrenchtorquesheetforinstallation
Outside diameter Torque Additional tightening torque
Ф6.35mm 1/4in 1500N.cm(153kgf.cm) 1600N.cm(163kgf.cm)
Ф9.52mm 3/8in 2500N.cm(255kgf.cm) 2600N.cm(265kgf.cm)
Ф12.7mm 1/2in 3500N.cm(357kgf.cm) 3600N.cm(367kgf.cm)
Ф15.9mm 5/8in 4500N.cm(459kgf.cm) 4700N.cm(479kgf.cm)
Ф19mm 3/4in 6500N.cm(663kgf.cm) 6700N.cm(683kgf.cm)
Table 4
6.2 Connectingthe cables
The power cord should be selected according to the following specifications sheet.
Appliance Amps AWG Wire Size
10 18
13 16
18 14
25 12
30 10
Table 5
The cable size and the current of the fuse or switch are determined by the maximum
current indicated on the nameplate which is located on the side panel of the
unit. Please refer to the nameplate before selecting the cable, fuse and switch.
Recommended: A means of disconnecting the power, should be within 10 feet of the
outdoor unit.
6.3 Pipelengthandtheelevation
Models Pipe size
Gas Liquid
9K 3/8in (Ф9.52mm) 1/4in (Ф6.35mm)
12K,18K 1/2in (Ф12.7mm) 1/4in (Ф6.35mm)
24K 5/8in (Ф15.9mm) 3/8in (Ф9.52mm)
Table 6
Models Standard
length
Max.
Elevation
Max. Length
A
Additional
refrigerant
9K,12K 7.5m
(24.6ft) 10m (32.8ft) 25m (82.0ft) 15g/m (0.16oz/ft)
18K 7.5m
(24.6ft) 20m (65.6ft) 30m (98.4ft) 15g/m (0.16oz/ft)
24K 7.5m
(24.6ft) 25m (82.0ft) 50m (164ft) 30g/m (0.32oz/ft)
Table 7
6.4 Firsttimeinstallation
Airpurgingwithvacuumpump
Figure 9
Liquid service valve
Gas service valve
Shut-O Knob Low
Refrigerant Manifold,
Blue Hose
Shut-O Knob High
Charge/Refrigerant
Hose
1. Completely tighten the flare nuts of the indoor and outdoor units, confirm
that both the liquid service and gas service valves are set to the closed
position.
2. Connect the refrigerant manifold, blue hose with the push pin of shut-off
knob of the low side to the gas service valve port.
3. Connect the refrigerant manifold, yellow hose to the shut-off high side
connection to the vacuum pump.
4. Fully open the shut-off knob low side of the manifold valve.
5. Operate the vacuum pump to evacuate.
6. Perform evacuation for 30 minutes and check whether the refrigeration
low side pressure gauge indicates -0.1Mpa(14.5Psi). If the meter does not
indicate -0.1Mpa(14.5Psi) after evacuating for 30 minutes, it should be
evacuated 20 minutes more. If the pressure can’t achieve -0.1Mpa(14.5Psi)
after evacuating 50 minutes, please check if there are some leakage
points. Fully close the shut-off knob low side of the manifold and stop the
operation of the vacuum pump. Confirm that the gauge needle does not move
(approximately 5 minutes after turning off the vacuum pump).
7. Make sure the pressure display in the pressure indicator is a little higher than
the atmospheric pressure. Then remove the charge hose from the gas service
valve.
8. Fully open the liquid service valve and gas service valve and securely tighten
the cap of the gas service valve. System is now evacuated and charged.
(Ensure that the unit is charged per the defined specifications).
Gas leak check (Use soap bubble method):
Apply soapy water or a liquid neutral detergent on the indoor unit
connections or outdoor unit connections by a soft brush to check for
leakage of the connecting points of the piping. If bubbles come out, the
pipes are leaking.

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6.5 Addingthe refrigeranttoanexisting system
Figure 10
Liquid service
valve
Gas service
valve
Procedure
1. Connect the refrigerant manifold, blue suction hose to the gas service
valve's service port, open the liquid service valve and the gas service valve.
Connect the refrigerant manifold, yellow hose to the valve at the bottom of the
cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure
liquid charge.
2. Purge the air from the refrigerant manifold, yellow hose. Open the valve at the
bottom of the cylinder and press the check valve on the refrigerant manifold
to purge the air.
CAUTION:
fLiquid refrigerant can cause frost bite. Handle with care.
3. Put the charging cylinder onto the electronic scale and record the weight.
4. Operate the air conditioner in cooling mode.
5. Open the valves (low side) on the refrigerant manifold and charge the system
with liquid refrigerant.
6. When the electronic scale displays the proper weight (refer to the gauge and
the pressure of the low side), turn off the refrigerant low side valve and the
refrigerant cylinder valve. Then turn off the unit to remove the hose from the
gas service valve.
7. Replace valve stem caps on the service port. Use a torque wrench to tighten
the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
6.6 Re-installation /indoorunitneedstoberepaired
Collectingtherefrigerantintotheoutdoorunit(passiverecovery)
Figure 11
Liquid service
valve
Gas service
valve
Procedure
1. Remove the valve stem caps and confirm that both the liquid and gas service
valves are set to the opened position. If not opened, use appropriate hex
wrench to open the valve stems.
2. Connect refrigerant gauge low side hose (blue) to the gas service valve's
service port
3. Air purging of the refrigerant manifold, blue hose: Open the low side valve of
manifold slightly to purge air from the hose for 5 seconds and then close it
quickly.
4. Set the liquid service valve to the close position.
5. Operate the air conditioner at the cooling cycle and stop it when the gauge
indicates 0.1Mpa(14.5Psi).
6. Set the gas service valve to the closed position immediately. Do this quickly
so that the gauge ends up indicating 0.3Mpa(43.5Psi) to 0.5 Mpa(72.5Psi).
Disconnect the refrigerant manifold, and tighten the liquid and gas service
valve’s stem nuts. Use a torque wrench to tighten the gas service valve's
service port cap to a torque of 18N.m. Be sure to check for gas leakage.

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6.7 Re-installationwhiletheoutdoorunitneedstoberepaired
Evacuationforthewholesystem
Figure 12
Liquid service
valve
Gas service
valve
Procedure:
1. Confirm that both the liquid and gas service valves are set to the opened
position.
2. Connect the vacuum pump to gas service valve’s service port.
3. Evacuate for approximately one hour. Confirm that the refrigerant manifold
low side indicates -0.1Mpa(14.5Psi).
4. 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).
5. Disconnect the charge hose from the vacuum pump.
Refrigerantcharging
Figure 13
Liquid service
valve
Gas service
valve
Procedure:
1. Connect the charge hose to the charging cylinder, open the liquid and the
gas service valve. Connect the charge hose which you disconnected from the
vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is
R410A, make the cylinder bottom up to ensure liquid charge.
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. Put the charging cylinder onto the electronic scale and record the weight.
4. Open the valves (Low side) on the refrigerant manifold and charge the system
with liquid refrigerant If the system cannot be charge with the specified
amount of refrigerant, or can be charged with a little at a time (approximately
150g each time) , operating the air conditioner in the cooling cycle; however,
one time is not sufficient, wait approximately 1 minute and then repeat the
procedure.
5. When the electronic scale displays the proper weight, disconnect the charge
hose from the gas service valve’s service port immediately. If the system has
been charged with liquid refrigerant while operating the air conditioner, turn
off the air conditioner before disconnecting the hose.
6. Mount 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.

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6.8 Operationcharacteristics
Temperature Cooling operation Heating operation Drying operation
Room temperature 62℉ - 90℉
(17℃ - 32℃)
32℉ - 86℉
(0℃ - 30℃)
50℉ - 90℉
(10℃ - 32℃)
Outdoor temperature
BMS500-AAS009-0CSXXA
BMS500-AAS012-0CSXXA
BMS500-AAS009-1CSXXA
BMS500-AAS012-1CSXXA
BMS500-AAS018-1CSXXA
BMS500-AAS024-1CSXXA
-13°F - 122°F (-25°C - 50°C) -13°F - 122°F (-25°C - 50°C) 32°F-122°F (0°C-50°C)
Table 8
EquationtoconvertCelsius toFahrenheit
( °F) = 1.8 x ( °C) + 32
CAUTION:
fIf the air conditioner is used beyond the above conditions,
certain safety protection features may come into operation
and cause the unit to operate abnormally.
fThe room relative humidity should be less than 80%. If the air
conditioner operates beyond this figure, the surface of the air
conditioner may attract condensation. Please set the vertical
air flow louver to its maximum angle (vertically to the floor),
and set HIGH fan mode.
fThe optimum performance will be achieved during this
operating temperature zone.

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7 ElectronicFunctions
7.1 Abbreviation
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Room temperature setting
Td:Off-set value (Td is an advanced feature)
T2b-A:suction temp for zone A in cooling (discharge temp for each zone in heating)
T2b-B:suction temp for zone B in cooling (discharge temp for each zone in heating)
T2b-C:suction temp for zone C in cooling (discharge temp for each zone in heating)
T2b-D:suction temp for zone D in cooling (discharge temp for each zone in heating)
T2b-E:suction temp for zone E in cooling (discharge temp for each zone in heating)
7.2 Displayfunction
7.2.1 Iconexplanationon indoordisplayboard.
Figure 14
Digitaldisplay:
fDisplays the temperature settings when the air conditioner is operational.
fDisplays the room temperature in FAN mode.
fDisplays the self-diagnostic codes.
fDisplays for three seconds when Timer ON, Fresh, Swing, Turbo
or Silence feature is activated.
fDisplays for three seconds when Fresh, Swing, Turbo or Silence
feature is cancelled.
fDisplays under defrosting operation (10min max).
fDisplays when anti-cold air feature is activated under heating
mode.
fDisplays during self clean operation (if applicable).
fDisplays and maintains a minimum temperature of 46°F (8°C) in
the space during heating operation.
fWhen ECO function(optional) is activated,the “ ”
illuminates gradually one by one as
in one second intervals.
A guide on using the infrared remote is not included in this literature
package. A separate user guide is available for the remote operations.
7.3 Mainprotection
7.3.1 Threeminutesdelayatrestart forcompressor
1 minute delay for the 1st time start-up and 3 minutes delay for others.
7.3.2 Temperatureprotectionofcompressordischarge
Compressor discharge temp. T5> 239 °F (115℃) for 5s,compressor stops.
7.3.3 Fanspeed isout ofcontrol
When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop
and the LED will display the failure.
7.3.4 Invertermoduleprotection
The Inverter module has a protection function about current, voltage and
temperature. If these protections happen, the corresponding code will display on
indoor unit and the unit will stop working.
7.3.5 Indoorfandelayed openfunction
When the unit starts up, the louver will be active immediately and the indoor fan
will open 7s later. If the unit is running in heating mode, the indoor fan will be also
controlled by anti-cold air function.
7.3.6 Compressorpreheatingfunctions
Preheating permitting condition:
When T4(outdoor ambient temperature) 37.4 °F (3°C), the preheating function will
be activated.
7.3.7 Sensorprotectionatopencircuitandbreakingdisconnection.
When there’s only one temperature sensor in malfunction , the air conditioner will
keep working but show the error code, in case of any emergency use.
When there’s more than one temperature sensor in malfunction, the air conditioner
will stop working.

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7.4 Operationmodesandfunctions
7.4.1 Fanmode
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
7.4.2 Coolingmode
7.4.2.1 Compressorrunningrules
When T1-Ts<ΔT 3.6°F (2℃), the compressor will stop.
When T1—Ts >ΔT 0.9°F (0.5℃) the compressor will be activated.
ΔT is the programmed parameter of temperature compensation. This parameter is
preset at the factory.
When the AC run in mute mode, the compressor will run with low frequency. When
the current is more than setting value, the current protection function will be
activated, and the compressor will stop.
7.4.2.2 Outdoorfanrunningrules
The outdoor unit will run at different fan speeds according to T4. For different
outdoor units, the fan speeds are different.
7.4.2.3 Indoorfanrunningrules
In cooling mode, indoor fan runs all the time and the speed can be selected as high,
medium, low and auto.
7.4.2.4 Condensertemperatureprotection
fTP3<T3< TP3+5, the compressor frequency will decrease to the lower
level until to F1 and then runs at F1.If TP3-3<T3< TP3, the compressor
will keep running at the current frequency.
fT3< TP3-3, the compressor will not limit the frequency and resume to the
former frequency.
fT3> TP3+5 for 5 seconds, the compressor will stop until T3< TP3-3.
7.4.2.5 Evaporatortemperatureprotection
When Evaporator temperature is less than setting value, the compressor will stop.
7.4.3 Heatingmode
7.4.3.1 Compressoroperation
When T1-Ts>-ΔT, the compressor will stop.
When T1-TS<ΔT-2.8°F (1.5°C) the compressor will be on.
ΔT is the programmed parameter of temperature compensation.
When the AC runs in mute mode, the compressor will run with low frequency. When
the current is more than the setting value, the current protection function will be
activated and the compressor will stop.
7.4.3.2 Outdoorfanoperation
The outdoor unit will be run at different fan speed according to T4.
For different outdoor units, the fan speeds are different.
7.4.3.3 Indoorfanoperation
When the compressor is on, the indoor fan can be set to high/med/low/auto and the
anti-cold wind function has the priority.
7.4.3.4 Defrostingmode
AC will enter the defrosting mode according to the value of T3 and the value range of
change in T3 and also the compressor running time.
During the defrosting mode, the compressor will run, indoor and outdoor motor will
stop and defrost lamp of the indoor unit will be lighted
“” will be displayed.
If any one of the following items is satisfied, the defrosting will finish and the machine
will turn to normal heating mode.
fT3 rises to be higher than TCDE 33.8°F (1℃).
fT3 keeps to be higher than TCDE 35.6°F (2℃) for 80 seconds.
fThe machine has run for 15 minutes in defrosting mode.
7.4.3.5 Evaporatorcoiltemperatureprotection
Figure 15
TEstop
T2
Resume
Off
Decrease
TEdown
TEH2
Hold
Off:Compressor stops.
Decrease:Decrease the running frequency to the lower level.
Hold:Keep the current frequency.
Resume:No limitation for frequency.
7.4.4 Auto-mode
This mode can be chosen with the remote controller and the setting temperature can
be changed between 62.6°F~86°F (17°C~30°C)
In auto mode, the machine will choose cooling, heating or fan-only mode according
to ΔT (ΔT =T1-Ts).
ΔT=T1-Ts Running mode
ΔT> 3.6°F (2℃) Cooling
-3.6°F (-2°C)≤ΔT≤ 3.6°F (2℃) Fan-only
ΔT< -3.6°F (-2℃) Heating
Table 9
Indoor fan will run at auto fan of the relevant mode.
The louver operates same as in relevant mode. If the machine switches mode
between heating and cooling, the compressor will keep stopping for 15 minutes and
then choose mode according to T1-Ts. If the setting temperature is modified, the
machine will choose running function again.

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
Data subject to change
7.4.5 Dryingmode
Indoor fan speed is fixed at breeze (low fan) and can’t be changed. The louver angle
is the same as in cooling mode.
All protections are active and the same as that in cooling mode.
7.4.6 Forced operationfunction
fForced cooling mode: The compressor and outdoor fan keep running and
the indoor fan runs at low speed. After running for 30 minutes, AC will
turn to auto mode with 75.2°F (24℃) setting temperature.
fForced auto mode: The action of forced auto mode is the same as normal
auto mode with 75.2°F (24℃) setting temperature.
When AC receives signals, such as switch on, switch off, timer on, timer off,
mode setting, fan speed setting, sleeping mode setting, follow me setting, it
will quit the forced operation.
7.4.7 Timerfunction
fTiming range is 24 hours.
fTimer on. The machine will turn on automatically when reaching the setting
time.
fTimer off. The machine will turn off automatically when reaching the
setting time.
fTimer on/off. The machine will turn on automatically when reaching the
setting “on” time, and then turn off automatically when reaching the setting
“off” time.
fTimer off/on. The machine will turn off automatically when reaching the
setting “off” time, and then turn on automatically when reaching the setting
“on” time.
fThe timer function will not change the AC current operation mode.
Suppose AC is off now, it will not start up firstly after setting the “timer off”
function. And when reaching the setting time, the timer LED will be off and
the AC running mode has not been changed.
fThe setting time is relative time.
fThe AC will quit the timer function when it has malfunction.
7.4.8 Sleepfunction
fThe sleep function is available in cooling, heating or auto mode.
fOperation process in sleep mode is as follow:
When cooling, the setting temperature rises 1.8°F (1℃) (be lower than 86°F
(30℃)) every one hour, 2 hours later the setting temperature stops rising and
the indoor fan is fixed at low speed.
When heating, the setting temperature decreases 1.8°F (1℃) (be higher than
62.6°F (17℃)) every one hour, 2 hours later the setting temperature stops
rising and indoor fan is fixed at low speed. (Anti-cold wind function has the
priority).
fOperation time in sleep mode is 7 hours. After 7 hours, the AC will turn off
and sleep mode will also be turned off.
fTimer setting is available
7.4.9 Auto-restartfunction
The indoor unit is equipped with auto-restart function, which is carried out through
an auto-restart module. In case of a sudden power failure, the module memorizes
the setting conditions before the power failure. The unit will resume the previous
operation setting (not including swing function) automatically after 3 minutes when
power returns.
If the memorization condition is forced cooling mode, the unit will run in cooling
mode for 30 minutes and turn to auto mode as 75.2°F (24℃) setting temp.
If AC is off before power off and AC is required to start up now, the compressor will
have 1 minute delay when power on. Other conditions, the compressor will have 3
minutes delay when restarts.
7.4.10 Refrigerantleakagedetection
With this new technology, the display area will show “EC” when the outdoor unit
detects refrigerant leakage. This function is only available in cooling mode.
7.4.11 Louverpositionmemoryfunction
When starting the unit again after shutting down, its louver will restore to the angle
originally set by the user, but the precondition is that the angle must be within the
allowable range, if it exceeds, it will memorize the maximum angle of the louver.
During operation, if the power fails or the end user shuts down the unit in the turbo
mode, the louver will restore to the default angle.
7.4.12 46.4°F(8°C)heating
In heating operation, the preset temperature of the air conditioner can be as low as
46.4°F (8℃), which keeps the room temperature steady at 46.4°F (8℃)
and prevents household things freezing when the house is unoccupied for a long time
in severe cold weather. This 46.4°F (8℃) heating mode is activated from the remote
controller by pressing the FP button.

Service Manual Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 19
Bosch Thermotechnology Corp. |02.2018 Data subject to change
7.4.13 Selfclean(optional)
For heat pump models which are provided with this function, after running in cooling
or drying mode, if the user press “Self Clean” button on remote controller, firstly,
indoor unit runs in fan only mode for a while, then low heat operation and finally runs
in fan only again. This function can keep the inside of indoor unit dry and prevent
breeding of mold.
7.4.14Followme
1. If the indoor PCB receives the signal which results from pressing the
FOLLOW ME button on remote controller, the buzzer will emit a sound and
this indicates the follow me function is initiated. But when the indoor PCB
receives signal which sent from remote controller every 3 minutes, the
buzzer will not respond. When the unit is running with follow me function, the
PCB will control the unit according to the temperature from follow me signal,
and the temperature collection function of room temperature sensor will be
inactive, but the error detective function of room temperature sensor will be
still valid.
2. When the follow me function is available, the PCB will control the unit
according to the room temperature from the remote controller and the setting
temperature.
3. The PCB will take action to the mode change information from remote
controller signal, but it will not be affected by the setting temperature.
4. When the unit is running with follow me function, if the PCB doesn’t receive
any signal from remote controller for 7 minutes or pressing FOLLOW ME
button again, the follow me function will be turned off automatically, and the
temperature will control the unit according to the room temperature detected
from its own room temperature sensor and setting temperature.
7.4.15 Silenceoperation(optional)
Press the “silence” button on remote controller to initiate SILENCE function. When
the Silence function is activated, the compressor running frequency will keep lower
than F2 (compressor frequency) and the indoor unit will bring faint breeze, which will
reduce the noise to the lowest level and create a quiet and comfortable room for you.

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|Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump Service Manual
02.2018 |Bosch Thermotechnology Corp.
Data subject to change
7.4.16 Pointcheckfunction (engineeringtroubleshootingmode)
Press the LED DISPLAY or LED or MUTE button of the remote controller three times,
and then press the AIR DIRECTION or SWING button three times in ten seconds,
the buzzer will keep ring for two seconds. The air conditioner will enter into the
information enquiry status. You can press the LED DISPLAY or AIR DIRECTION button
to check the next or front item’s information.
When the AC enter the “information enquiry” status, it will display the code name in 2
seconds, the details are as follows.
Enquiry information Displaying code Meaning
T1 T1 Indoor room temperature
T2 T2 Coil temperature of evaporator
T3 T3 Coil temperature of condenser
T4 T4 Outdoor ambient temperature
T2B Tb Coil temperature of evaporator
TP TP Compressor discharge temperature
TH TH Compressor suction temperature
Targeted Frequency FT Targeted Frequency
Actual Frequency Fr Actual Frequency
Indoor fan speed IF Indoor fan speed
Outdoor fan speed OF Outdoor fan speed
EXV opening angle LA EXV opening angle
Compressor continuous running time CT Compressor continuous running time
Causes of compressor stop. ST Causes of compressor stop.
Reserve A0
Reserve A1
Reserve 0
Reserve 1
Reserve 2
Reserve 3
Reserve 4
Reserve 5
Reserve 6
Reserve L
Reserve A
Reserve U
Reserve T
Table 10