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Service – 39

VMBMH302

13.2.5 Sub menu SERVICE -> INSTALLATION

Used for settings that are set during installation.

Menu selection

Meaning

Factory setting

ENGLISH

Language setting for the control system.

The button sequence that is to be pressed to access this menu to
change language is shown here:

(5 seconds), , , , , , .

You are now in the language menu, select language using or .

ENGLISH

(ÈEŠTINA,
POLSKI,
EESTI,
SUOMI,
DANSK,
NORSK,
ITALIANO,
ESPAÑOL,
FRANÇAIS,
NEDERLANDS,
DEUTSCH,
ENGLISH,
SVENSKA)

SYSTEM

Note! The menu selection
in the SYSTEM menu
varies depending on the
selected values. Tip: start
in the top menu and
work downwards.

Sub menu SERVICE -> INSTALLATION -> SYSTEM:

Menu selection

Meaning

HEAT SOURCE

AIR:

Menu selection Meaning

DIRECT
EVAPORATION

The actual system with direct evaporation and
4-way valve.

HEATING SYSTEM

VL SYSTEM

POOL
(Expansion card)

ON /
Cannot be selected if SHUNT GROUP is selected.

SHUNT GROUP

ON /

When ON, HEAT CURVE 2 is activated in the INFORMATION menu.
Cannot be selected if POOL is selected.

ADDITION

0-10V:    (Expansion card)
CURRENT LIMITER: ON /  (Expansion card)
PHASE FAULT:  / PHASE READING

SERVICE TIME

NOTE!

Only used for test operation. The heat pump counts 60

times as fast, which means that the waiting times are eliminated
during test operation.

0 = deactivates SERVICE TIME
1 = activates SERVICE TIME which speeds up the control system’s
integral calculation and start delay by 60 times.

-

FACTORY SET

CANCEL = starting point, no changes made.
RADIATOR = reset factory settings for radiator system
FLOOR = reset factory settings for under floor heating

-

RESET OPER. TIME

0 = no reset of operation times
1 = reset operation times to zero

-

SENSOR CALIBRATION

Following sensors are in the installation:

OUTDOOR
SUPPLY LINE
RETURN LINE
HOT WATER
REFR 1
REFR 2
REFR 3
EXTERNAL FACTOR (these parameters affect all sensors except
the outdoor sensor. The parameter compensates for the external
influence on the sensor that is mounted in the heat pump.

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Содержание DHP-AX

Страница 1: ...VMBMH302 Danfoss DHP AX Installation and Service instructions ...

Страница 2: ...eat pump DHP AX If these instructions are not followed during installation and service Danfoss AS s liability according to the applicable warranty is not binding Danfoss AS retains the right to make changes to components and specifications without prior notice 2009 Copyright Danfoss AS ...

Страница 3: ...n 14 6 3 Connecting the power supply 15 6 4 Positioning and connecting outdoor sensors 15 7 Installing accessories additional functions 15 7 1 Room temperature sensor 15 7 2 EVU function 16 7 3 Room setpoint reduction 16 8 Checking the installation 16 8 1 Starting before the installation is complete 16 8 2 Installation checklist 16 8 3 Manual test 17 8 4 Reinstalling panels 18 9 Start up and commi...

Страница 4: ...if necessary measures are not taken A fourth symbol is used to give practical information or tips on how to perform a procedure E E Information regarding making the handling of the installation easier or a possible operational technical disadvantage 1 3 Terminology The instructions contain terms throughout that designate components and functions The table lists the most com mon terms that are used...

Страница 5: ...ge concentrations can arise with a resultant risk of suffocation due to a lack of oxygen A A Danger Risk of personal injury Anyone with symptoms of poisoning from the vapour must immediately move or be moved into the fresh air A A Danger Risk of personal injury Refrigerant exposed to a naked flame creates a poisonous irritating gas This gas can be detected by its odour even at concentra tions belo...

Страница 6: ...m temperature sensor is connected to a safety extra low voltage Follow the separate installation instructions for the room temperature sensor 2 5 Commissioning D D The installation may only be commissioned if the heating system is filled and bled Otherwise the circulation pump can be damaged D D If the installation is only to be driven by an aux iliary heater during the installation ensure that th...

Страница 7: ...Service 7 VMBMH302 Installation instructions ...

Страница 8: ...Components The component image below shows diagrammatically how the heat pump looks inside There may be differ ences between different versions Figure 2 Components in DHP AX Position Name 1 Fan 2 Operating pressostat 3 High pressure pressostat 4 Low pressure pressostat 5 2 way expansion valve 6 Drying filter 7 Compressor 8 Air heat exchanger 9 Electrical cabinet 10 Condenser 11 Four way valve 12 H...

Страница 9: ...10K warm side 2 At A7W35 according to EN 14511 3 Nominal flow heating circuit Δ10K 4 At minimum outdoor temperature 0 o C 5 According to ISO 3741 6 The values apply to a new heat pump with clean heat exchangers Air to water heat pump Refrigerant Type Amount kg Test pressure MPa Design pressure MPa Compressor Type Scroll Scroll Scroll Scroll Oil POE POE POE POE Electrical data 3 N 50Hz Main supply ...

Страница 10: ...on and service instructions 1 User manual 1 Electrical instructions 1 Decal sheet 1 Registration card only for certain markets 3 4 Transporting the heat pump D D The heat pump must always be transported and stored standing and in a dry environment If the heat pump is laid on the incorrect side it may become seriously damaged as the oil in the compressor can run out in the pressure pipe and therefo...

Страница 11: ... the unit The area around the heat pump must therefore be correctly drained in order to catch the water approximately 2 litres per defrost A drip tray accessory that collects and leads the melt water away can be installed D D The heat pump s adjustable stand must be posi tioned on a secure base such as wooden sleep ers paving slabs or cast footings D D The heat pump has six adjustable feet that mu...

Страница 12: ...st be made of heat resistant and corrosion resistant material e g copper The safety valve overflow pipes must have an open connection to the drain and visibly flow into this in a frost free environment D D The connecting pipe between the expansion tank and the safety valve must slope continu ously upwards A continuous upwards slope means that the pipe must not slope downwards from the horizontal a...

Страница 13: ...he connec tion diagram 5 3 Connecting the heating system sup ply and return lines E E For information on how flexible hoses should be installed see section 15 Noise information 1 Connect the supply line with a flexible hose connec tion and with all the necessary components accord ing to the connection diagram 2 Connect the return line with a flexible hose connec tion and with all the necessary com...

Страница 14: ...tion of the components in the control centre Position Name 1 I O card 2 Expansion card accessory 3 Overcurrent relay 4 Fuse 5 Defrost card 6 Soft starter 7 Terminal blocks 8 Capacitor 6 2 Cable connection E E Electrical connection can also cause noise so this installation must be carried out appropriately An appropriate installation is where there is approximately 300 mm free cable between the hea...

Страница 15: ...must be sealed so that the sensor is not affected by outgoing air The outdoor sensor is connected by a two core cable For a cross section of 0 75 mm2 a maximum cable length of 50 m applies For greater lengths a cross section of 1 5 mm2 is used up to a maximum of 120 m Then connect the sensor to the heat pump s control cen tre according to the electrical instructions 7 Installing accessories additi...

Страница 16: ...e connection as for the EVU function according to the electrical instructions and with the aid of a 10 kohm resistor and an external 1 pin timer for example z z The extent of the room setpoint reduction is set in the menu INFORMATION HEAT CURVE REDUCTION 8 Checking the installation NOTE Read the safety instructions D D The installation may only be commissioned if the heating system and water heate...

Страница 17: ...rn injury the pressure pipe on the compressor can get up to 125 degrees in temperature after operating for a while Figure 12 The pressure pipe should get hot during operation 3 Check that z z the compressor is running in the right direction by putting a hand on the pressure pipe before the com pressor starts the pipe is then cold Feel again after a short while to ensure the pressure pipe becomes p...

Страница 18: ...ontrol panel 9 2 1 Hot water D D NOTE If an external water heater is to be installed it must be activated in the SERVICE menu See instructions below 1 Open the SERVICE menu by pressing and holding in for five seconds 2 In the HOT WATER START menu set the value to 40 9 2 2 Aux heater D D NOTE If an auxiliary heater is to be installed it must be activated in the SERVICE menu See instructions below 1...

Страница 19: ...e actions z z Demonstrate how to navigate the INFORMATION menu and which settings the customer can set themselves z z Demonstrate how to view history and operating times z z Show the pipe installation and go through the periodic maintenance actions that the customers must be aware of check recommended pressure on manometers fill the heating system exercise safety valves clean strainer z z Explain ...

Страница 20: ...20 Service VMBMH302 Service instructions ...

Страница 21: ...tdoor air through an air heat exchanger which heats up the cold refrigerant which evaporates into a gas The energy produced during this process is retrieved from the passing outdoor air 2 The refrigerant that now supplies energy in the form of heat is transferred to the compressor which both increases its temperature and pressure 3 The extremely hot refrigerant continues to the condenser Here the ...

Страница 22: ...for the house by the compressor until the outdoor tem perature reaches the value for OUTDOOR STOP when it becomes too cold for the compressor to operate If an auxiliary heater has been installed it is used to produce hot water and heating for as long as OUTDOOR STOP applies DHP AX defrosts the air heat exchanger automatically if required Heating system hot supply Heating system cold return Hot Col...

Страница 23: ...frost The figure above shows DHP AX during defrost The process is reversed by means of the four way valve that changes the direction of flow which means that the air heat exchanger for heating becomes a condenser and the heating s condenser becomes an evaporator This function is used for defrosting As the heat pump s defrosting sequence retrieves its energy from the house s heated heating system d...

Страница 24: ...not start hot water will not be produced in order to indicate to the customer that something is wrong Heat is produced by the auxiliary heater so that the house does not become cold 11 5 Important parameters 11 5 1 Heat production calculating The indoor temperature is adjusted by changing the heat pump s heat curve which is the control system s tool for calculating what the supply temperature shou...

Страница 25: ...ot become steeper or flatter if the ROOM value is changed which the curve becomes if the CURVE value changes instead the entire heat curve is moved by 3 C for every degree change of the ROOM value The reason that the curve is adjusted 3 C is that an approximate 3 C increase in supply temperature is usually needed to increase the indoor tem perature 1 C Figure 21 Changing the ROOM value changes the...

Страница 26: ...rquet floors might be damaged If you have under floor heating and stone floors MIN should not be too low in order to achieve a comfortable floor temperature in the summer time when heating is not required A possible solution to obtain optimum temperatures is to use a shunt group for under floor heating If your house has a basement the MIN value should be adjusted to a suitable temperature for the ...

Страница 27: ... the heat in advance during sudden changes of the heat demand there is a value HYSTERESIS which controls the difference between the actual supply temperature t1 and the calculated supply tempera ture t2 If the difference is the same or greater than the set HYSTERESIS value x i e there is a heat demand or the heat demand disappears quicker than the usual integral calculation the integral value is f...

Страница 28: ...16 by means of a graph in the character window Figure 25 Graph that shows how the value for DEFR CURVE 0 can be set The value for OUTDOOR STOP that is set means that the compressor will no longer be used for heating or hot water production if the outdoor temperature is the same as or lower than the value Heating and hot water production then occurs with the help of the auxiliary heater The value f...

Страница 29: ...menus and increase or reduce the set values The menu INFORMATION is opened by pressing the left or right buttons The INFORMATION menu has a number of sub menus that are described in section 13 Menu information For installation and service the hidden menu SERVICE is used This is opened by holding the left button depressed for five seconds The SERVICE menu has a number of sub menus that are describe...

Страница 30: ... automatically controlled by the control system HEAT PUMP The control system is controlled so that only the heat pump unit compressor is allowed to operate In this operating mode peak heating charging anti legionella function of the hot water will not be run because auxiliary heaters must not be used AUX HEATER The control system only permits the auxiliary heater to be in operation This operating ...

Страница 31: ...e heat pump will start EVU STOP Indicates that the additional function EVU is active This means that the heat pump is off as long as EVU is active NO HEAT DEMAND Indicates that there is no heating production demand HEAT PUMP START XX Indicates that there is a heating production demand and will start in the specified number of minutes HEAT PUMP AUX HEAT Indicates that heat production is active with...

Страница 32: ... in italics are only visible if the expansion card and certain sensors are installed Menu Sub menu Selection settings INFORMATION OPERAT Ø AUTO HEAT PUMP AUX HEATER HOT WATER MANUAL TEST HEAT CURVE CURVE MIN MAX CURVE 5 CURVE 0 CURVE 5 HEAT STOP REDUCTION ROOM FACTOR POOL POOL HYSTERESIS HEAT CURVE 2 Expansion card CURVE 2 MIN MAX TEMPERATURE OUTDOOR ROOM SUPPLY LINE RETURN LINE HOT WATER INTEGRAL...

Страница 33: ...hown as a graph that also shows MIN and MAX values 40 C during under floor hea ting 30 C interval 22 C 56 C MIN Minimum permitted supply temperature if the temperature for heat stop has been reached and the heat pump has stopped 10 C interval 10 C 50 C MAX Maximum permitted supply temperature 55 C during under floor hea ting 45 C interval 40 C 85 C CURVE 5 Local increase or reduction of CURVE at a...

Страница 34: ...icate the prevailing temperatures history and set calculated values History can be accessed to view all the values by pressing the right arrow to present a graph of the last 60 measurement points for the set time interval SERVICE INSTALLATION LOGTIME In the event of an alarm history stops being logged until the alarm is reset by changing the operating mode to OFF Menu selection Meaning Factory set...

Страница 35: ...FORMATION DEFROST This menu is used to obtain information about outdoor unit defrosting and to make certain settings Menu selection Meaning Factory setting DEFROSTS Total number of defrosts carried out BETW 2 DEFR The operating time of the compressor in minutes between the 2 last defrosts TIME LAST DEFR The operating time of the compressor in minutes since last defrost DEFROST CURVE Here the angle...

Страница 36: ...NTERVAL TOPH STOP INFL H W SENSOR WEIGHT HOT WATER HEAT PUMP INTEGRAL A1 HYSTERESIS MAX RETURN START INTERVAL PRESS PIPE OUTDOOR STOP SHUNT TIME AUX HEATER MAX STEP INTEGRAL A2 HYSTERESIS MAX STEP MAX CURRENT HOT WATER STOP MANUAL TEST MANUAL TEST HEAT PUMP COMPR HE CIRC PUMP REV V HOT WATER AUX HEATER 1 FAN ALARM SHUNT GROUP REV V POOL INSTALLATION ENGLISH SYSTEM HEAT SOURCE HEATING SYSTEM POOL S...

Страница 37: ...temperature and the calculated supply temperature is too great either the integral value is set to start value A1 the heat pump starts or the value is set to 0 stops the heat pump 12 C interval 1 C 15 C MAX RETURN Stop temperature at high return from the heating system 55 C interval 30 C 70 C START INTERVAL Minimum tine interval between two heat pump starts in minu tes 20M interval 10M 30M PRESS P...

Страница 38: ...TEST Setting options for manual test 0 deactivate manual test 1 activate manual test 2 activate manual test with option of navigating from the SERVICE menu to check that the temperatures rise HEAT PUMP 0 stop heat pump 1 start heat pump D D NOTE The heat pump cannot be started in the event of an active alarm COMPR HEATER 0 stop compressor heater 1 start compressor heater CIRC PUMP 0 stop circulati...

Страница 39: ...NT GROUP is selected SHUNT GROUP ON When ON HEAT CURVE 2 is activated in the INFORMATION menu Cannot be selected if POOL is selected ADDITION 0 10V Expansion card CURRENT LIMITER ON Expansion card PHASE FAULT PHASE READING SERVICE TIME NOTE Only used for test operation The heat pump counts 60 times as fast which means that the waiting times are eliminated during test operation 0 deactivates SERVIC...

Страница 40: ...ere using or The setting is made by reducing the OUTDOOR STOP value by this value The number of degrees shown after DEFR CURVE in the display is the set value for OUTDOOR STOP The combined temperature is shown in the top right corner of the display The graph can be changed up or down at the outdoor tempera ture OUTDOOR STOP in the display See section 11 5 Important parameters for further informati...

Страница 41: ...Service 41 VMBMH302 ...

Страница 42: ...nd inappropriate installations look using this type of hose To avoid noise caused by pipe mounting rubber coated clamps should be used to prevent the transmission of vibrations However installation should not be too rigid and the clamps must not be too tight Figure 29 Do not twist the flexible hoses as they are installed At threaded connections use a counterhold spanner Figure 30 Cut the hose to t...

Страница 43: ...and only helps temporarily z z Place the heat pump on rubber feet or synthetic vibration dampers designed for its weight z z Do not forget flexible hoses preferably lengths that enable them to be routed in a loop If necessary use rubber straps to secure flexible hoses in position so that they do not lie against each other or create vibra tion bridges z z Ensure that electrical wiring is not put un...

Страница 44: ...n outside sensor When the control system calculates the heat demand zero degrees is used SUPPLY LINE SENSOR Supply line sensor error Everything stops except the heating system s circulation pump RETURN LINE SENSOR Return sensor fault Return temperature Supply line 5 is used Calculated supply tempe rature limited to maximum 45 C HOT WATER SENSOR Fault on sensor for start temperature No hot water pr...

Страница 45: ...5 343 35 14 8 10 276 40 12 2 15 224 45 10 1 20 183 50 8 5 25 150 55 7 1 30 124 60 6 0 35 103 65 5 0 40 86 70 4 2 75 3 7 80 3 1 85 2 7 90 2 3 95 2 0 1 Disconnect the sensor cable at the I O card 2 First measure the sensor including the cable 3 Then measure the sensor only 15 3 Check points Temperatures Name Values Condensing temperature 0 5 1 5 C above supply line temperature Evaporation temperatur...

Страница 46: ...rine circuit is defective or has jammed Check That the circulation pump spins That the shut off valves are open That the strainer is not blocked That no air is in the heating system The circulation pump may have jammed if so open the bleed screw and try to release the paddle wheel using a screw driver for example Open closed valves or taps Check and if necessary clean the strai ner If necessary bl...

Страница 47: ...erant adjust the expansion valve until the correct value is obtained See separate instructions for cooling techniques If overheating cannot be adjusted with the expansion valve or if the capillary tube bulb is damaged replace it 12 Lack of refrigerant not enough refrigerant in the system Using manometer apparatus and ther mometer check that the unit s overhea ting is correct for the specific refri...

Страница 48: ...y to heat pumps in the Optimum series If there is no voltage to the circulation pump check if there is voltage from the I O card see wiring diagram If there is voltage from the I O card check the com ponents between the I O card and the circulation pump If a component is defective replace it 5 Shut off main tap in heating system Check that the main tap is open Open closed main tap 6 Cable break or...

Страница 49: ... check that the unit s overhea ting is correct for the specific refrigerant Follow the correct procedure depending on type of refrigerant to add the correct amount of refrigerant If there appears to be a leak in the refri gerant circuit carry out leak tracing and any necessary corrective action 13 Blocked condenser on the water side If there is no strainer in the heating sys tem there is a risk of...

Страница 50: ...signals from the I O card replace it 4 Defective or incorrectly set motor protection Use a hook on meter to establish when the motor protection deploys check what the motor protection is set to Compare with the table If the motor protection is defective replace it If incorrectly set adjust to the correct value 5 Cable break Check the supply to the motor protec tion soft starter compressor If a cab...

Страница 51: ...bles are loose damaged secure or replace them 3 Overheating protection fault cannot be reset Press the reset button measurement check for 230 V on the incoming and out going connections If the overheating protection is defective replace it 4 Flow sensor fault Check what the flow sensor shows is it a plausible actual value Measure the resistance of the sensor check against the ohm table in section ...

Страница 52: ...ernatively high hot gas temperature indicated by in the display s lower left hand corner Cause Troubleshooting Remedy 1 The operating pressure switch does not close again 1 Switch off the main switch for the heat pump wait until the compressor has been stationary for at least 15 minutes 2 Disconnect the two cables on the pres sure switch using a buzzer check if the pressure switch is closed If the...

Страница 53: ...ection Locate the leak Replace nut or connection 3 Defective gasket or O ring Locate the leak Replace the gasket or O ring 4 There is no overflow pipe con nected to the safety valve s Establish which safety valve does not have an overflow pipe Install an overflow pipe according to the applicable norms 5 Filler valve between incoming cold water and heating system not closed or leaking Check whether...

Страница 54: ...l with a greater volume To prevent the expansion tank retracting inwards a vacuum valve can be installed in the system 15 4 3 Noise Problem Noise problem in the radiator system Cause Troubleshooting Remedy 1 Flexible hoses missing Flexible hoses must be installed accor ding to the instructions Install flexible hoses according to the instructions 2 Incorrectly installed flexible hoses Flexible hose...

Страница 55: ...s the control signals from the I O card see wiring diagram If the soft starter is defective replace it 3 The compressor s IPR valve opens The compressor has an integrated IPR valve that opens at 28 3 bar When the valve opens pressure equalizes between the compressor s high and low pressure side and a milling whistling sound is heard To establish whether the valve opens at the correct pressure conn...

Страница 56: ...alue Measure the resistance of the sensor check against the ohm table in section 15 3 Measurement points If the sensor is defective replace it 6 Large drain flow 12l min Check how many litres of hot water approx 40 C per minute drains from the tap Use a clock and bucket to measure the drain flow If the drain water flow is greater than 12l min stratification in the water heater is affected which re...

Страница 57: ...RVE and MAX settings Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor temperature MAX Highest set point value on the supply line regardless of the outdoor temperature 2 Incorrect operating mode set in the heat pump s control com puter Check which operat...

Страница 58: ...the heat pump stops on INTEGRAL If the heating system is deemed to be under dimensioned the system must be extended increase the heat emitting surface 8 The external auxiliary hea ter does not start when the heat pump s control computer requests it If an external auxiliary heater is used check that it is correctly installed by test running it in MANUAL TEST AUX HEATER 1 If it does not start at man...

Страница 59: ...ss of the outdoor temperature 2 Sensor fault OUTDOOR ROOM SUPPLY LINE Check what the relevant sensor shows is it a plausible actual value Measure the resistance of the sensor check against the ohm table in section 15 3 Measurement points If the sensor is defective replace it 3 Defective 3 way valve motor The motor should set the valve to the relevant end position depending on operating con ditions...

Страница 60: ...ing near external doors windows and heat sources Install the outdoor sensor according to the instructions and calibrate it if necessary 15 4 6 Other Problem The heat pump runs and runs but never stops Cause Troubleshooting Remedy 1 Air in the heating system Listen for air in the heat pump and hea ting system Bleed the heating system according to the installation instructions 2 Lack of refrigerant ...

Страница 61: ...transmitted Check what the return line sensor shows is it a plausible actual value If not take a resistance reading from the sensors and check against the ohm table in section 15 3 Measurement points If the MAX RETURN value is not adjusted for the system according to the trou bleshooting window adjust it If the sensor is defective replace it 6 The compressor runs back wards The incoming phases hav...

Страница 62: ... 5 The compressor has been stop ped by the operating pressure switch or pressure pipe sensor Check if a square appears in the display s lower let corner if so the operating pres sure switch is open or the pressure pipe sensor triggers an alarm for too high tem perature The operating pressure switch is most easily checked by using a buzzer to see if it is connected The pressure pipe sensor value is...

Страница 63: ...t pump Measurement check what the difference between the supply and return line is using a thermometer t The difference should be about 7 10 C can vary depending on refrigerant A lower t results in reduced efficiency in the heat pump Adjust the system to obtain the correct t 4 Incorrect flow in the brine circuit Measurement check what the difference between the supply and return line is using a th...

Страница 64: ...h temperature The operating pressure switch is most easily checked by using a buzzer to see if it is connected The pressure pipe sensor value is read off from the control computer in the HEAT PUMP menu Is it a plausible actual value If not take a resistance reading from the sen sor and check against the ohm table in the installation instructions The compressor has been stopped by the pressure pipe...

Страница 65: ...omer s requirements wishes Check the ROOM CURVE INTEGRAL A1 and INTEGRAL A2 settings Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor temperature INTEGRAL A1 Start value for the com pressor INTEGRAL A2 Start value calculated from A1 for the auxiliary he...

Страница 66: ...fficient water volume A tight fitting sys tem with poor pipe dimensions may produce the same pheno mena Check if the heat pumps starts if the supply temperature rises quickly whilst nothing happens to the return tempera ture If this happens and the heat pump is stopped by the hysteresis function to later drop in temperature supply as quickly to start again but cannot due to time conditions in regu...

Страница 67: ...ump s control compu ter 3 The defroster shunt does not regulate as it should Manually test to check if the defroster shunt opens and closes the flow over the defroster tank If the motor switches position when testing but defrosting still does not fun ction remove the motor and try closing and opening the valve by hand by pres sing in the control arm If the motor is defective replace it If the inse...

Страница 68: ...68 Service VMBMH302 ...

Страница 69: ...Service 69 VMBMH302 ...

Страница 70: ...VMBMH302 ...

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