Danfoss DHP-AQ Operating Guide


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Danfoss DHP-AQ Operating Guide | Manualzz

Service instructions

DHP-AQ

VMGFJ102

If these instructions are not followed during installation and service, Danfoss A/Sliability according to the applicable warranty is not binding. Danfoss A/S retains the right to make changes to components and specifications without prior notice.

© 201 1 Copyright Danfoss A/S.

The Swedish language is used for the original instructions. Other languages are a translation of original instructions.

(Directive 2006/42/EG)

Contents

1

2

3

About documents and decals ...................................................... 3

3.1

3.2

3.3

3.4

3.5

1.1

1.2

1.3

1.4

Introduction .................................................................................... 3

Symbols in documents ................................................................ 3

Symbols on decals ........................................................................ 3

Terminology .................................................................................... 5

Important information .................................................................... 6

2.1

2.2

2.3

2.4

2.5

General safety precautions ........................................................ 6

Refrigerant ....................................................................................... 6

Electrical connection .................................................................... 7

Important information ................................................................ 7

Commissioning .............................................................................. 8

Troubleshooting ................................................................................ 9

Alarm ................................................................................................. 9

Components ................................................................................. 10

Measurement points ................................................................. 11

Check points ................................................................................. 14

Operational problems ............................................................... 14

VMGFJ102 – 1

1 About documents and decals

1.1

Introduction

The following documents are available for this product:

Installation instructions containing information to install and commission a heat pump installation, and information about the heat pump’s function, accessories and technical data. Supplied with the heat pump on delivery.

Service instructions that contain information about fault tracing. The service instructions are available for download as below.

The electrical instructions that contain the wiring diagram for the heat pump intended for fault tracing and service. The electrical instructions are available for download as below.

The maintenance instructions must handed over and gone through with the end customer. Supplied with the heat pump on delivery.

Country specific instructions and forms are available where relevant. Supplied with the heat pump on delivery.

Sheet with adhesive decals that will be used as translation for the existing English language type plates.

The Service instructions and Electrical instructions are available for download here: www.documentation.heatpump.danfoss.com

1.2

Symbols in documents

The instructions contain different warning symbols, which, together with text, indicate to the user that there are risks involved with actions to be taken.

The symbols are displayed to the left of the text and three different symbols are used to indicate the degree of danger:

DANGER! Indicates an immediate danger that leads to fatal or serious injury if necessary measures are not taken.

Warning! Risk of personal injury! Indicates a possible danger that can lead to fatal or serious injury if necessary measures are not taken.

Caution! Risk of installation damage. Indicates a possible hazard that can lead to item damage if necessary measures are not taken.

A fourth symbol is used to give practical information or tips on how to perform a procedure.

Note! Information regarding making the handling of the installation easier or a possible operational technical disadvantage.

1.3

Symbols on decals

The following symbols can occur on decals on the different parts of the heat pump. Which symbols are used depends on the heat pump model.

Service instructions VMGFJ102 – 3

Warning symbols

!

!

Warning, danger!

Read the documentation provided.

Read the documentation provided.

Warning, hazardous electrical voltage!

Warning, hot surfaces!

Warning, moving parts!

Warning, risk of crushing injury!

Electrical components

Component, normal

55

71

304

353

3

50

54

Outdoor unit

Outdoor sensor

Hot water sensor

Sensor hot-water top

Flow sensor

Circulation pump

Drip tray

Example:

406

Room sensor

Component, accessory

362 Shunt valve

363 Exchange valve hot water

365 Supply line sensor

366 Return line sensor

406 Room sensor

408 EVU

417 Defrost sensor

4 – Service instructions VMGFJ102

Pipe connections

Bleeding

Defrosting tank

Expansion tank with safety valve, brine

Brine

Temperature and pressure relief valve

Tap water

Outdoor unit

Water heater

Heating system

1.4

Terminology

Term

Heating system/Heat transfer fluid circuit

Supply line

Return line

Circulation pump

Refrigerant circuit

Refrigerant

Meaning

The circuit that generates heat to the property or to the water heater.

The heating system’s supply line with flow direction from the heat pump to radiators/ under floor heating or water heater.

The heating system’s return line with flow direction from radiators/under floor heating or water heater to the heat pump.

Circulation pump for heating system.

The energy carrying circuit between the outdoor air and heating system.

The gas/liquid that circulates in the refrigerant circuit.

Service instructions VMGFJ102 – 5

2 Important information

2.1

General safety precautions

Warning! Risk of personal injury! Children are not permitted to play with the product.

Caution! The heat pump must be installed by authorised installation engineers and the installation must follow the applicable local rules and regulations as well as these installation instructions.

Caution! This product is not intended for persons (including children) with reduced physical, sensory or psychological capacity, or who do not have knowledge or experience, unless supervised or they have received instructions on how the apparatus functions from a safety qualified person.

Caution! When cooling it is important to limit the lowest flow line temperature to prevent condensation.

2.2

Refrigerant

2.2.1

Fire risk

The refrigerant is not combustible or explosive in normal conditions.

2.2.2

Toxicity

In normal use and normal conditions the refrigerant has low toxicity. However, although the toxicity of the refrigerant is low, it can cause injury (or be highly dangerous) in abnormal circumstances or where deliberately abused.

Warning! Risk of personal injury! Spaces in which heavy vapour can collect below the level of the air must be well ventilated.

Refrigerant vapour is heavier than air and, in enclosed spaces below the level of a door for example, and in the event of leakage, concentrations can arise with a resultant risk of suffocation due to a lack of oxygen.

Warning! 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 concentrations below its permitted levels. Evacuate the area until it has been sufficiently ventilated.

2.2.3

Work on the refrigerant circuit

Caution! Work on the refrigerant circuit must only be carried out by a certified engineer!

Caution! When repairing the refrigerant circuit, the refrigerant must not be released from the heat pump it must dealt with in the appropriate way.

6 – Service instructions VMGFJ102

Refilling must only be carried out using new refrigerant (for the amount and type of refrigerant see manufacturer’s plate) through the service valves.

Caution! All warranties from Danfoss are void if, when filling with refrigerant other than Danfoss A/S specified refrigerant, if there has not been written notification that the new refrigerant is an approved replacement refrigerant together with other remedies.

2.2.4

Scrapping

Caution! When the heat pump is to be scrapped the refrigerant must be extracted for disposal. Local rules and regulations related to the disposal of refrigerant must be followed.

2.3

Electrical connection

DANGER! Hazardous electrical voltage! The terminal blocks are live and can be highly dangerous due to the risk of electric shock. All power supplies must be isolated before electrical installation is started. The heat pump is connected internally at the factory, for this reason electrical installation consists mainly of the connection of the power supply.

Warning! Electrical installation may only be carried out by an authorised electrician and must follow applicable local and national regulations.

Warning! The electrical installation must be carried out using permanently routed cables. It must be possible to isolate the power supply using a multi-pole circuit breaker with a minimum contact gap of 3 mm.

2.4

Important information

Caution! A normal heating system always contains a certain amount of corrosion particulates (rust) and sludge products from calcium oxide. This comes from acid that is naturally occurring in the fresh water that the system is filled with. It is not good practice to have to fill the heating system regularly which is why any leakage in the heating system should be repaired immediately. Normal filling should occur only once or twice a year. The water in the heating system should be as clean as possible, always position the dirt filter on the return line from the heating system to the heat pump, as close to the heat pump as possible.

Caution! Hard water; Normally it is not a problem installing a heat pump in areas with hard water because the normal operating temperature for the hot water does not exceed 60°C. In areas where there are exceptional prevailing conditions with the water one can install a softening filter, which softens the water, cleans any impurities and prevents the build up of calcification.

Service instructions VMGFJ102 – 7

2.5

Commissioning

Caution! The installation may only be commissioned if the heating system is filled and bled. Otherwise the circulation pump can be damaged.

Caution! If the installation is only to operate using an auxiliary heater during the installation, ensure that the heating system is filled and bled and that the compressor cannot be started. This is carried out by setting the operating mode to AUX. HEATER.

8 – Service instructions VMGFJ102

3 Troubleshooting

3.1

Alarm

In event of alarm this is indicated in the display with the text ALARM and an alarm message, see following table.

For alarms that are not reset automatically acknowledgement is required. Acknowledge the alarm by setting the heat pump to operating mode OFF and then back to the desired operating mode.

Message

MOTOR P COMP.ERROR

MOTOR P FAN ERROR

EL. HEATER ERROR

HEAT / PRESSURE ERROR

Meaning

The compressor motor protection has deployed.

The fan motor protection has deployed.

The electrical heater overheating protection has deployed.

The expected pressure and temperature change in the refrigerant circuit has not happened in the correct way at compressor start.

Evaporation pressure has fallen too low.

Fault in low pressure transmitter alternatively cable fault.

High pressure switch has deployed.

The flow sensor has registered too low a flow.

Too high temperature in heat pump junction box/electrical cabinet.

Circulation pump is jammed. Start attempt made.

LOW PRESSURE ERROR

LOW PRESSURE TRANSDUCER

HIGH PRESSURE ERROR

LOW HEAT CIR. FLOW

MAX TEMP ELEC. HW

NO. OF TRIES X/5

(where X=1…5)

HEATING CIRC. PUMP

HEATING SYSTEM PUMP

OUTDOOR SENSOR

DEFROST SENSOR

SUPPLY LINE SENSOR

SYSTEM SUPPLY LINE SENSOR

RETURN LINE SENSOR

HIGH RETURN LINE TEMP

BUFFER TANK SENSOR

HGW SENSOR

HOT WATER SENSOR

HOT WATER TOP

FAILSAFE MODE

REFR.1 SENSOR

REFR.2 SENSOR

LOW RETURN TEMP 1

LOW RETURN TEMP 2

LOW EVAP. TEMP 1

LOW EVAP. TEMP 2

SUCTION TEMP SENSOR

ROOM SENSOR

DISCHARGE PIPE SENSOR

DISTR. CIR. 1 SENSOR

DISTR. CIR. 2 SENSOR

POOL SENSOR

COM. ERROR HP-CARD

COM. ERROR HUB-CARD

Circulation pump is jammed.

Circulation pump is jammed.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault. Defrost sensor.

Sensor fault alternatively cable fault. Supply line sensor.

Sensor fault alternatively cable fault. System supply line sensor.

Sensor fault alternatively cable fault. Return line sensor.

Return line temperature too high

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault (the lower sensor, Start sensor).

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault on one of the refrigerant sensors. The heat pump goes to failsafe mode and defrosts on time.

Sensor fault alternatively cable fault. Refrigerant sensor 1

Sensor fault alternatively cable fault. Refrigerant sensor 2

The return line temperature is too low to start a defrosting.

The return line has fallen too low during defrosting.

Evaporation temperature too low.

Too great a deviation in evaporation temperature average value.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Sensor fault alternatively cable fault.

Communication broken between display card and heat pump card (outdoor).

Communication broken between display card and hub card (indoor).

Service instructions VMGFJ102 – 9

Message

COM. ERROR EXV-CARD

COM. ERROR EXPANSION CARD

Meaning

Communication broken between display card and expansion valve control card (outdoor).

Communication broken between display card and expansion card (indoor).

Note! In event of alarm the heat pump will if possible supply heating to the house, primarily with the compressor, secondarily with the auxiliary heater. Hot water will stop to indicate that something noteworthy has occurred.

3.2

Components

3.2.1

Outdoor unit

10

1

2

3

4

5

6

7

8

9

Figure 1.

Components

Position Name

1

2

Electrical cabinet

Fan

10 – Service instructions VMGFJ102

18

19

11

14

15

16

17

12

13

Position Name

11

12

Electronic expansion valve

Receiver

Position Name

8

9

6

7

3

4

5

10

Pressure transmitter

Suction line

Compressor

High pressure switch

Operating pressure switch

Four-way valve

Discharge pipe

Air heat exchanger

3.2.2

Indoor unit

Position Name

16

17

18

19

13

14

15

Drying filter

Heat exchanger

Flow sensor

Heating system supply line

Return line heating system

Solenoid

Non-return valve

1

DHP-AQ Mini

3

2

1

DHP-AQ Midi

4

2

1

3

4

DHP-AQ Maxi

5

Position

3

4

5

1

2

Description

Control module (transparent in image)

Immersion heater

Reversing valve

Circulation pump

Water heater

3.3

Measurement points

Caution! When reading the resistance of the sensors, the sensor leads must first be disconnected from the control equipment.

Service instructions VMGFJ102 – 11

Table 1.

Outdoor / Defrost sensor

°C

30

35

40

10

15

20

25

0

5

-10

-5

-30

-25

-20

-15

150 ohm, Ω

276

224

183

150

124

103

86

681

538

428

343

1884

1443

1115

868

Table 2.

PT1000 sensor

°C

40

50

60

70

0

10

20

30

1000 ohm, Ω

1000

1039

1078

1117

1155

1194

1232

1271

Table 3.

Other sensors

°C

60

65

70

75

40

45

50

55

80

85

20

25

30

35

0

5

10

15

22 kilo ohm, kΩ

6,0

5,0

4,2

3,7

12,2

10,1

8,5

7,1

3,1

2,7

27,1

22,0

18,0

14,8

66,3

52,4

41,8

33,5

3.3.1

Measurement checking sensors during fault tracing

1.

2.

3.

Disconnect the relevant sensor from I/O-card/terminal block.

Measure the resistance for the sensor and any extension cables.

Then measure the sensor only.

Note! To ensure the sensor value the actual temperature must be checked against the measured resistance.

12 – Service instructions VMGFJ102

3.3.2

Positioning sensors

7

7

Heat pump DHP-AQ Midi DHP-AQ Maxi

Symbol explanation

5

6

7

8

9

3

4

1

2

DISCHARGE PIPE SENSOR

SUCTION TEMP SENSOR

REFR.1 SENSOR

REFR.2 SENSOR

DEFROST SENSOR (located to rear beside air intake)

OUTDOOR SENSOR (positioned on wall to north)

SUPPLY LINE SENSOR

HOT WATER TOP

HOT WATER SENSOR

RETURN LINE SENSOR - Located on return pipe that runs to heat pump. See system solution in the Installation instructions.

8

9

Service instructions VMGFJ102 – 13

3.4

Check points

Table 4.

Temperatures

Name

Condensing temperature

Evaporation temperature

Radiator circuit

Overheating R407C

Values

0.5 – 1.5 °C above supply line temperature

7 - 8 °C

8°K temperature difference

4K ±1 K

Table 5.

Break pressure switch/pressure transmitter

Refrigerant

R407C

Pressure switch/pressure transmitter

OP (operating pressure switch)

High pressure switch

Pressure transmitter low pressure

Break pressure

2.85 MPa

3,10 MPa

0.04 MPa

Following parameters can be read off in the display:

Suction gas temperature

Evaporation pressure

Evaporation temperature (calculated from ”Dew point”)

Opening percent EXV

Superheating

This means new opportunities to diagnose the heat pump, without needing to remove the covers and work on the cooling circuit.

In normal operation the heat pump operates with superheating of 5.5°C – 7°C, the expansion valve's degree of opening will vary depending on operating situation.

At outdoor temperatures of -5°C or lower the opening degree is below 20%

At outdoor temperatures of +5C to +13°C the opening degree is around 40-50%

When cooling (A35W18) the degree of opening is 100%

If superheating is >9°C and the degree of opening of the expansion valve lies steady at 100% this can indicate that a significant part of the refrigerant has leaked from the heat pump. If this is the case the heat pump must be checked by service technicians with personal refrigeration certificates!

3.5

Operational problems

The tables list the most probable and common causes of the problem first. When troubleshooting the cause of a problem start with the first cause and go down the list. There may be more than one way of troubleshooting a cause where the most probable is given first.

14 – Service instructions VMGFJ102

3.5.1

Alarm

Table 6.

Problem – Alarm LP (lower pressure transmitter)

Cause

1. Cable break or loose cable to lower pressure transmitter.

2. The pressure transmitter opens too soon.

3. Lack of refrigerant, not enough refrigerant in the system.

4. Drying filter blockage.

5. Blocked evaporator on the refrigerant side.

Troubleshooting

Check that both cables are connected to the lower pressure transmitter.

Using the buzzer, check that there are no cable breaks. In order to do this, disconnect the cables from the lower pressure transmitter and circuit board.

Pressure transmitter fault, opens at a higher pressure than indicated. Check break pressure using the manometer apparatus.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Check the temperature difference above the drying filter. A difference of max 1°C is permissible. If the difference is greater, the filter is blocked. Take a reading during operation.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Remedy

If a cable has come loose, reconnect it.

If there is a cable break, replace the cable.

If the pressure transmitter breaks too early, replace it.

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 refrigerant circuit, carry out leak tracing and any necessary corrective action.

If the drying filter is sealed, replace it.

If the evaporator is thought to be blocked by oil for example, try blowing nitrogen through it to release the oil. If this does not work, it must be replaced

Table 7.

Problem – Alarm HP (high pressure switch)

Cause

1. Air in the heating system.

Troubleshooting

Listen for air in the heat pump and heating system.

Check that the strainer is not blocked.

Remedy

Bleed the heating system according to the installation instructions.

Clean the strainer if necessary.

2. Blocked strainer in the heating system.

3. Closed or partially closed thermostats/valves in the heating system.

4. The circulation pump that is defective or has jammed.

Check that the thermostats/valves in the heating system are open.

Is there voltage and 0 – 10V signal (applies to A classed circulation pumps) up to the circulation pump?

Open closed thermostats/valves.

Check that the circulation pump is active in the control system’s manual test menu.

Check if there is voltage to the circulation pump, if there is, and it does not run, the circulation pump is jammed. If this is the case, open the bleed screw and try to release the paddle wheel using a screwdriver for example (Does not apply to heat pumps in Opti).

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 components between the I/O card and the circulation pump.

If a component is defective, replace it.

Service instructions VMGFJ102 – 15

Cause

5. Shut-off main tap in heating system.

6. Cable break or loose cable to high pressure switch.

7. The high pressure switch does not open.

8. The high pressure switch opens too soon.

9. External system shunt that closes on time setting.

10. Incorrectly facing non-return valve with too high opening pressure.

11. Large pressure drop in the heating system.

Troubleshooting

Check that the main tap is open.

Remedy

Open closed main tap.

Check that both cables are connected to the pressure switch.

Using the buzzer, check that there are no cable breaks. In order to do this, disconnect the cables from the pressure switch and circuit board.

Incorrect pressure switch installed.

Same or higher break pressure than the high pressure switch. See marking.

Pressure switch fault, opens at a higher pressure than indicated (mark pressure). Check using the manometer apparatus.

Defective pressure switch, never opens.

Incorrect pressure switch installed. As low or lower break pressure than operating pressure switch. See marking.

Pressure switch fault, opens at a lower pressure than indicated (mark pressure). Check using the manometer apparatus.

Defective pressure switch, always open.

If a cable has come loose, reconnect it.

If there is a cable break, replace the cable.

If the high pressure switch does not open, replace it.

If the high pressure switch opens too soon or is always open, replace it.

Check for shunts or valves in the system, which are timer-controlled, that close down the entire or too large a part of the heating system.

Check the system’s direction of flow and that the non-return valve is turned the correct way.

Check that the heat pump’s external available pressure exceeds the nonreturn valve’s opening pressure.

Dirt in the heating system.

Closed or partially closed thermostats/valves in the heating system.

Under dimensioned pipe system.

Check that the HP’s external available pressure exceeds the system pressure drop.

Always ensure that there is a sufficiently large water volume for the heat pump to work against, i.e. for the heat to give off its heat to.

If the non-return valve is facing the wrong way, turn it.

If the non-return valve has too great an opening pressure, replace it.

If necessary, clean/flush the heating system.

Open closed thermostats/valves.

If there is not sufficient pressure equipment, the heating system can be adjusted according to the system solution for large pressure drop.

16 – Service instructions VMGFJ102

Cause

12. Blocked condenser on the water side.

13. Blocked condenser on the refrigerant side.

14. Overfilled refrigerant circuit.

Troubleshooting

If there is no strainer in the heating system, there is a risk of dirt sticking in the condenser and blocking it. Unfortunately there is no easy way of checking if the condenser is blocked.

You can carry out a test by allowing the compressor and circulation pumps to remain in operation and after a while, check that the pressure pipe becomes hot and that the circulation pumps work (for circ.pumps with a bleed screw, unscrew it and feel if the pump rotor rotates using a screwdriver).

Then read the temperature on both connection pipes to the condenser:

If the temperature difference is <3°C, the condenser is probably blocked.

If the temperature difference is 3-13°C, it is probably not blocked.

If the temperature difference is >13°C, the condenser is probably blocked.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Remedy

If the condenser is thought to be blocked, try flushing it. If this does not work, it must be replaced

If the condenser is thought to be blocked by oil for example, try blowing nitrogen through it to release the oil. If this does not work, it must be replaced

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 refrigerant circuit, carry out leak tracing and any necessary corrective action.

Table 8.

Problem – Alarm MS (motor protection)

Cause

1. Phase drop or blown fuse.

2. Cable break.

3. Defective soft-starter (three-phase heat pump).

4. Defective soft-starter (single phase heat pump).

Troubleshooting Remedy

Check the fuses in the fuse box. Check that all phases are present on the terminal block for incoming supply. Also check that all wiring is secure, if screw terminals are used they must be properly tightened, if phoenix flat spring terminals are used, the cables must be secure in the correct hole with load on the cable.

If any of the phases are missing, check backwards towards the building’s main electrical cabinet. If there are no phases there, contact the network supplier.

Check the supply to the motor protection, soft-starter or compressor.

Measurement check and establish that when the Heat pump card gives a signal

(there must be voltage between A1 & A2 on the soft-starter), the soft-starter releases all three phases down to the compressor.

Check measure and establish that when the Heat pump card gives a signal (there must be voltage between ON and N on the soft-starter), the soft-starter releases the phases to the compressor.

If a cable is damaged, replace it.

If the soft-starter does not release the phases when it receives signals from the heat pump card, replace it.

If the soft-starter does not release the phases when it receives signals from the heat pump card and does not alarm as below, replace it.

Service instructions VMGFJ102 – 17

Cause Troubleshooting

5. Defective or incorrectly set motor protection.

6. Defective compressor.

Use a hook-on meter to establish when the motor protection deploys, check what the motor protection is set to.

Compare with the table. For three phase heat pumps all three phases must be supplied.

Measurement check the voltage on the phase(s) (each to zero) at the compressor.

There must not be any large deviation between the phases. If measurement checking the winding’s resistance the same value must be on one to three windings.

7. Alarm from single phase soft starter. Check the fault cause using the soft start

LEDs.

Remedy

If the motor protection is defective, replace it.

If incorrectly set, adjust to the correct value.

If the compressor is defective, replace it.

Table 9.

Problem – Alarm sensor (all)

Cause

Sensor fault alternatively cable fault.

Troubleshooting

When reading the resistance of the sensors, the sensor leads must first be disconnected from the control equipment or terminal block.

First take a reading from the sensor including cable and check against the ohm table in Symbols on decals.

If the read off value does not correspond with the table, only measure the sensor and check the ohm table

in Measurement points, Page 11.

Remedy

If the sensor gives a correct value, the cable is defective.

If the sensor does not give a correct value, the sensor is defective.

Table 10.

Problem – Err phase seq.

Cause

The incoming phases have the incorrect sequence (only applies to 3-phase heat pumps), appears after a minute when the compressor is started.

Troubleshooting

If the text HEAT / PRESSURE ERROR is displayed it can mean that the phases are in the incorrect order.

When the compressor is running, check the pressure pipe temperature by feeling the pressure pipe. If the phases are correctly sequenced it should be hot (not just warm) even a distance from the compressor.

When the compressor runs with the phases incorrectly sequenced a strange noise may be heard (loud, rattling) when the compressor runs backwards.

Remedy

If the phases are in the incorrect order, switch two incoming phases at the main terminal block and recheck according to the troubleshooting window.

18 – Service instructions VMGFJ102

Table 11.

Problem – Alarm electric heater error

Cause

1. The overheating protection has tripped.

2. Phase drop.

The alarm occurs when 230 V is not registered between L2 on the circuit board and N. Does not apply if MAX

STEP = P.

3. Overheating protection fault, cannot be reset.

4. Flow sensor fault.

5. No or insufficient circulation in the heating system.

Troubleshooting

Check if the overheating protection has tripped.

Check if the overheating protection has tripped.

Check if any cables at the circuit board or overheating protection are loose or damaged.

Press the reset button, measurement check for 230 V on the incoming and outgoing connections.

Check what the flow sensor shows. Is it a plausible/actual value?

Measure the resistance of the sensor,

check against the ohm table in Measurement points, Page 11.

Check:

That the circulation pump spins

That the shut-off valves are open.

That the strainer is not blocked.

That there is no air in the heating system.

Remedy

If the overheating protection has tripped, reset it.

If the overheating protection has tripped, reset it.

If the cables are loose or damaged, secure or replace them.

If the overheating protection is defective, replace it.

If the sensor is defective, replace it.

The circulation pump may have jammed. If so, open the bleed screw and try to release the paddle wheel using a screwdriver for example.

Open closed valves or taps.

Check, and, if necessary, clean the strainer.

If necessary, bleed the heating system according to the installation instructions

Table 12.

Problem – Alarm circulation pump

Cause

The circulation pump’s integrated alarm has deployed. (Only applies to

Opti)

Troubleshooting

Air in the heating system.

Has the circulation pump jammed?

Remedy

Vent the heating system and TWS coil.

If the circulation pump has jammed, there is an integrated shake function that attempts to shake itself loose up to a maximum of 5 times, if it does not succeed, an alarm will occur.

Try cutting the voltage to the heat pump to stop the alarm and then manually run the circulation pump.

If the alarm recurs, repeat the procedure several times. If this does not help, replace the circulation pump.

Service instructions VMGFJ102 – 19

Table 13.

Problem – Operating pressure switch open alternatively high hot gas temperature

Cause

1. Operating pressure switch, function.

2. Fault in the discharge pipe sensor.

Check what the discharge pipe sensor shows. Is it a plausible/actual value?

3. Hot gas temperature too high.

Measure the resistance of the discharge pipe sensor, check against the ohm table

in Measurement points, Page 11.

The discharge pipe sensor displays more than 140°C. See operating data.

4. Lack of refrigerant, not enough refrigerant in the system.

Troubleshooting

1.

2.

Switch off the main switch for the heat pump, wait until the compressor has been stationary for at least 15 minutes.

Disconnect the two cables on the pressure switch, using a buzzer check if the pressure switch is closed.

Remedy

If the pressure switch is closed, bridge the pressure switch cables temporarily and switch on the voltage to the heat pump again. If there is an indication 0

(zero) in the display this means that the pressure switch is fault-free and the problem is in the wiring or in the circuit board.

If the pressure switch is open, try carefully tapping the head of the pressure switch with a screwdriver and use a buzzer test to see if it has closed again.

Replace the pressure switch if it appears to jam repeatedly.

If the discharge pipe sensor is defective, replace it.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

The square symbol appears when the delivery pipe temperature is as high or greater than the maximum temperature of the discharge pipe 140°C.

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 refrigerant circuit, carry out leak tracing and any necessary corrective action. If leak tracer is not available, brush soap water on the suspected leak and look for bubbles. Also check for oil as this can come out from the refrigerant circuit.

3.5.2

Leakage

Table 14.

Problem – Leak fluid side

Cause

1. Insufficiently tightened connections.

2. Defective gasket or O-ring.

3. Cracked nut or connection.

4. There is no overflow pipe connected to the safety valve(s).

5. Filler valve between incoming cold water and heating system not closed or leaking.

Troubleshooting

Locate the leak.

Locate the leak.

Locate the leak.

Establish which safety valve does not have an overflow pipe.

Check whether water continuously leaks from the safety valve on the expansion vessel on the hot side.

Remedy

Tighten the connection and check that it is sealed.

If it is still not sealed, replace the entire connection and support sleeve (only at soft pipes).

Replace the gasket or O-ring.

Replace nut or connection.

Install an overflow pipe according to the applicable norms.

Try closing the filler valve and see if water stops dripping from the safety valve. If not, replace the filler valve.

20 – Service instructions VMGFJ102

Cause

6. Leak at soldered joints.

7. Associated leakage in the condenser.

8. Leak at soldered joint on water heater (only applies to DHP-AQ Maxi)

9. Associated leakage on plate heat exchanger (only applies to DHP-AQ

Maxi)

Troubleshooting

Locate the leak.

Check for lack of refrigerant in the unit.

Check by smelling at the safety valve on the hot side, open the valve and check.

Locate the leak.

Check for lack of refrigerant in the unit

Check by smelling at the safety valve on the hot side, open the valve and check.

Remedy

Drain the system of fluid, repair the leak.

If the leak is on the connection pipe to the heat exchanger, also drain the refrigerant side.

If the condenser has a leak, replace it.

If there is a leak at the soldered joint, replace the water heater.

If there is leakage, replace plate heat exchanger.

3.5.3

Noise

Table 15.

Problem – Noise problem in the radiator system

Cause

1. Flexible hoses missing.

Troubleshooting

Flexible hoses must be installed according to the instructions.

2. Incorrectly installed flexible hoses.

Flexible hoses must be installed according to the instructions.

3. Installing/suspending pipes.

Check if vibrations are transmitted via one of the pipe mountings in the installation.

4. Circulation noise (whistling noise in the heating system).

5. Clicking.

Check the heating system.

Closed valves, choke valves, adjuster valves or other restrictions in the radiator system can cause circulation noise.

Is the heating system correctly adjusted for flow?

Too great a flow in the heating system can cause circulation noise.

Check that the volume tank is installed and has the correct dimensions for the relevant system. See the installation instructions.

Establish when clicking occurs, during heating and/or in connection with completed hot water production?

Locate the clicking noises.

Remedy

Install flexible hoses according to the instructions.

Install flexible hoses according to the instructions.

Remove or move the mounting point or install vibration isolating mounting parts.

If the incorrect type of valve is used to choke the flow, replace with the correct type.

If the heating system is not correctly adjusted, make adjustments.

Can the heating system be run at a lower flow?

A surge tank can be installed on the supply line to mix the hot water with the existing, slightly cooler, water, before it goes out to the radiators.

Try lubricating lead-ins in walls, ceilings and floors with silicone spray.

Service instructions VMGFJ102 – 21

Table 16.

Problem – Loud compressor noise

Cause

1. Phase drop.

The compressor attempts to start or operates on two phases (only applies to 3 phase heat pumps) .

2. Touching pipes – vibrations.

3. Compressor fault

Troubleshooting

1.

2.

Check that there is 400 V between incoming phases on the heat pump.

If there is supply to the heat pump, measure the voltage for all electrical components all the way to the compressor, see wiring diagram.

Establish which pipe(s) is/are causing the problem.

Determine whether the compressor is unusually loud.

Check with a voltmeter at a point before and after the soft starter. The measurement values should not differ.

Remedy

Check where the phase drop is and rectify.

Try to remove the contact:

If the compressor is defective, replace it.

Table 17.

Problem – Shrieking, whistling noise

Cause

1. Noise from the soft-starter.

2. The compressor’s safety valve opens.

Troubleshooting

Measurement check the input and output phases for the soft-starter as well as the control signals from the heat pump card, see wiring diagram.

The compressor has an integrated safety valve that opens when the pressure difference between high and low pressure sides is too large. A whistling sound can be heard during pressure equalisation. Use a manometer to check at which pressure differential pressure equalisation occurs.

Remedy

If the soft-starter is defective, replace it.

Replace the compressor if the valve opens at too low pressure or when the compressor is stationary.

Table 18.

Problem – Noise – miscellaneous

Cause

1. Vibrating protective sleeves on the pressure switches.

2. Vibration noise from the electrical installation.

Troubleshooting Remedy

Establish where the vibration noise is coming from.

Check for electrical steps or similar devices screwed to the heat pump and wall. These can cause vibrations and noise.

Prevent the protection sleeve vibrating by using insulation tape for example.

Carry out according to the installation instructions.

22 – Service instructions VMGFJ102

3.5.4

Hot-water

Table 19.

Problem – Temperature and/or quantity

Cause Troubleshooting

1. Defective 3-way valve motor.

2. Jammed reversing valve.

The valve is not secure and releases hot water to the radiators during hot water production.

Check the function of the reversing valve by test running it manually.

Detach the motor and test closing and opening the valve by turning the shaft by hand.

3. Air in TWS coil or water outer jacket.

During hot water production:

Listen for air.

Check the temperature difference between supply and return line.

4. Start temperature set too high for hot water production.

5. Sensor fault, hot water sensor.

Hot water production is started by the hot water sensor.

6. Large drain flow (>12 l/min).

Check that the start temperature is correctly set. Should not be set above the factory set value.

Check what the hot water sensor (the start sensor) shows. Is it a plausible/actual value?

Measure the resistance of the sensor,

check against the ohm table in Measurement points, Page 11.

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.

7. Water heater too small in relation to requirement.

How large is the requirement and what is the capacity of the heater?

8. The operating pressure switch opens too soon (at too low a pressure).

Hot water production ends when the operating pressure switch opens.

Check the break pressure using manometer apparatus.

Remedy

If the motor is defective, replace it.

If it jams, replace with a new one.

Bleed the system.

A Large temperature difference can indicate air in the system.

If the start value is set too high, reduce it to the factory set value.

If the sensor is defective, replace it.

If the drain water flow is greater than 12 l/min, stratification in the water heater is affected, which reduces the hot water capacity.

Suggested corrective actions:

Install a pressure reduction valve on the incoming cold water pipe.

Change to a mixer with lower flow.

Adjust the drain flow on the existing mixer, do not open the tap fully.

Replace with a larger heater or supplement with an extra heater.

E.g. supplement with an DWH or an electric heater.

If the pressure switch opens at the incorrect pressure, replace it.

The replacement pressure switch can be installed on the service output (Schrader valve).

Service instructions VMGFJ102 – 23

Cause

9. Insufficient exchange surface to transfer the heat pump’s output to the heater.

(Only applies to heat pumps with a separate heater.)

10. Heat loss in the hot water pipe.

Troubleshooting Remedy

Is the exchange surface too small?

Can the heater cope with the heat pump’s output?

Replace with a heater with a larger exchange surface.

Open the hot water tap, read off the temperature on the outgoing hot water pipe from the heat pump and the temperature of the hot water. The temperature difference measured between the heat pump and hot water indicates the temperature loss.

Examples of temperature loss causes:

Long water pipes.

Uninsulated hot water pipes.

Hot water pipes routed through cold areas.

Other causes that can affect the hot water temperature:

Is a mixer valve installed in the system? Temperature set too low on the mixer valve? Leaking mixer valve?

Water tap fault? Leaking thermostat mixer?

VVC loss.

If any problems occur during troubleshooting as per the points, carry out corrective actions.

To quickly check that the heat pump’s hot water production works as it should, drain the hot water so that the heat pump starts to produce the hot water.

When done, read off the temperature on the top sensor and on the start sensor.

The top sensor should show a temperature of around 50 - 55°C and the start sensor around 45 - 48°C. If, after completed hot water production, these temperatures are obtained, this means that you have the correct temperature and volume of hot water in the water heater.

3.5.5

Heating comfort

Table 20.

Problem – Too cold

Cause

1. The heat pump’s control computer is not set/adjusted to the customer’s requirements/wishes.

2. Incorrect operating mode set in the heat pump’s control computer.

3. Sensor fault, OUTDOOR/ROOM/SUP-

PLY LINE/RETURN LINE.

Troubleshooting Remedy

Check the ROOM and CURVE and MAX settings.

Check which operating mode is set.

Check what the relevant sensor shows. Is it a plausible/actual value?

Measure the resistance of the sensor,

check against the ohm table in Measurement points, Page 11.

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.

If the incorrect operating mode is set, change to the desired operating mode.

If the sensor is defective, replace it.

24 – Service instructions VMGFJ102

Cause

4. The 3-way valve has jammed in hot water mode.

5. Defective electric heating element.

6. The heat pump has stopped on HIGH

RETURN.

7. Heat production is stopped by the

HYSTERESIS function.

Troubleshooting

1.

2.

Check the function of the 3-way valve motor by test running it manually. If the motor does not shift mode during manual test operation, check that there is voltage to the motor, see wiring diagram.

Detach the motor and test closing and opening the valve by turning the shaft by hand.

Use a buzzer and check if all coils in the electric heating element are intact.

Check what the MAX RETURN value is set at in the heat pump’s control computer. It must be adjusted to the unit’s maximum supply temperature and the system’s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is 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 Measurement points, Page 11.

If the flow temperature rises as soon as heat production is stopped by HYSTERE-

SIS before INTEGRAL reaches 0, there may be heating deficit in the house.

Check if heat production stops because the hysteresis value is set too low? (See the installation instructions for factory setting.)

Check if heat production stops because thermostats/valves in the heating system are closed or partially closed?

Check if heat production stops because the heating system is under dimensioned?

Check the set value on MAXSTEP in the heat pump’s control computer.

Remedy

Is the motor being supplied with voltage according to the wiring diagram in both operating instances?

MANUAL TEST – REV.V. HOT WATER

0=Radiator mode

1=Hot water mode

If there is voltage to the motor but it does not shift mode, replace it.

If the electric heating element is defective, replace it.

If the MAX RETURN value is not adjusted for the system according to the troubleshooting window, adjust it.

If the sensor is defective, replace it.

Try increasing the hysteresis value until the heat pump stops on INTE-

GRAL instead.

Open thermostats/valves in the heating system and check that the heat pump stops on INTEGRAL.

If the heating system is deemed to be under dimensioned, the system must be extended (the heat emitting surface increased).

If necessary, adjust the MAXSTEP value in the heat pump’s control computer.

230V 1-N MAXSTEP 1 – 3

400 V 3-N: MAXSTEP 1 – 5

8. The auxiliary heater is not permitted to cut in with sufficient output.

Value set too low on MAXSTEP.

MAXSTEP 1 = 3 kW

MAXSTEP 2 = 6 kW

MAXSTEP 3 = 9 kW

MAXSTEP 4 = 12 kW

MAXSTEP 5 = 15 kW

9. The external auxiliary heater 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 –

EXT.AUX.HEATER - 1.

If it does not start at manual test operation, check that the start signal/voltage comes from the heat pump. See wiring diagram.

MAXSTEP 1 = 3 kW

MAXSTEP 2 = 6 kW

MAXSTEP 3 = 9 kW

MAX STEP 4 = 12 kW (cannot cut in when the compressor is running.)

MAX STEP 5 = 15 kW (cannot cut in when the compressor is running.)

Connect the external auxiliary heater according to the instructions.

Measure the voltage on the I/O card’s probe L2 Oil/Electricity.

Service instructions VMGFJ102 – 25

Cause Troubleshooting

10. Closed or partially closed thermostats/valves in the heating system.

11. The total output of the heat pump and auxiliary heater is too low in relation to the building’s power demand.

Check that the thermostats/valves in the heating system are open.

What is the building’s power demand?

What is the output of the heat pump?

What is the output of the auxiliary heater, what is it set to?

12. Under dimensioned heating system. Check existing heating system.

What output is it dimensioned for to produce at what supply temperature?

What output is required to keep the room warm?

13. Changed conditions

Have you increased your heating and/or hot water demand?

If the heat pump has been dimensioned for a certain demand and this demand is increased, the heat pump might not be able to maintain the desired room temperature.

If hot water consumption increases, a larger proportion of time is used to produce hot water, which means less time for heat production (only applies to system solution 1).

Remedy

Open closed thermostats/valves.

Ensure that available power is at least as great as the building’s power demand.

If the heating system is dimensioned for greater supply temperatures than the heat pump can provide, it must be adjusted by increasing the heat emitting surface for example.

If the room requires a higher output than the heating system can provide, extend the heating system.

If the heat pump cannot cope with the demand, replace it with one with a higher output or supplement it with a higher output auxiliary heater.

Table 21.

Problem – Too hot

Cause

1. The heat pump’s control computer is not set/adjusted to the customer’s requirements/wishes.

Troubleshooting

Check the ROOM and CURVE and MIN settings.

2. Sensor fault, OUTDOOR/ROOM/SUP-

PLY 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 Measurement points, Page 11.

Remedy

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.

MIN = Lowest set-point value on the supply line regardless of the outdoor temperature.

If the sensor is defective, replace it.

26 – Service instructions VMGFJ102

Cause

3. Defective 3-way valve motor.

The motor should set the valve to the relevant position depending on operating conditions. If it does not, hot water from the water heater will mix with the radiator water.

4. Jammed reversing valve.

If the valve is not sealed, hot water from the water heater will mix with the radiator water.

Troubleshooting Remedy

Check the function of the 3-way valve motor by test running it manually. If the motor does not shift mode during manual test operation, check that there is voltage to the motor, see wiring diagram.

Detach the motor and test closing and opening the valve by turning the shaft by hand.

Is the motor being supplied with voltage according to the wiring diagram in both operating instances?

MANUAL TEST – REV.V. HOT WATER

0=Radiator mode

1=Hot water mode

If there is voltage to the motor but it does not shift mode, replace it.

If it is sluggish or jams, replace with a new one.

Table 22.

Problem – Irregular indoor temperature

Cause

1. The heat pump’s control computer is not set/adjusted to the customer’s requirements/wishes.

Troubleshooting

Check the ROOM and CURVE, MIN, MAX

CURVE5, CURVE0, CURVE-5 and HEAT

STOP settings.

2. Incorrectly positioned/installed sensors.

Check that outdoor sensors and any room sensors are installed according to the instructions and that they are calibrated.

Remedy

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.

MIN = Lowest set-point value on the supply line regardless of the outdoor temperature (on the condition that heat stop does not apply).

MAX = Highest set-point value on the supply line regardless of the outdoor temperature.

CURVE5,0,-5 =

The supply temperature can be adjusted up or down 5°C at these outdoor temperatures.

HEAT STOP = Stops all production of heat when the outdoor temperature is the same as or greater than the set value.

To exit heat stop the outdoor temperature must drop to 3°C below the set value.

Check that the room sensor is positioned in a suitable place that is representative of the building and calibrate it if necessary. Avoid placing near external doors, windows and heat sources.

Install the outdoor sensor according to the instructions and calibrate it, if necessary.

Service instructions VMGFJ102 – 27

3.5.6

Other

Table 23.

Problem – The heat pump runs and runs but never stops

Cause

1. Air in the heating system.

2. Changed conditions Have you increased your heating and/or hot water demand?

3. Lack of refrigerant, not enough refrigerant in the system.

Troubleshooting

Listen for air in the heat pump and heating system.

If the heat pump has been dimensioned for a certain demand and this demand is increased, the heat pump might not be able to maintain the desired room temperature.

If hot water consumption increases, a larger proportion of time is used to produce hot water, which means less time for heat production.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Remedy

Bleed the heating system according to the installation instructions.

If the heat pump cannot cope with the demand, replace it with one with a higher output or supplement it with a higher output auxiliary heater.

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 refrigerant circuit, carry out leak tracing and any necessary corrective action. If leak tracer is not available, brush soap water on the suspected leak and look for bubbles. Also check for oil as this can come out from the refrigerant circuit.

Table 24.

Problem – Runs on electric heating element

Cause

1. Operating mode AUX. HEATER is selected.

2. The compressor cannot run due to an alarm.

3. The integral value has reached the start level for the auxiliary heater.

4. Peak heat operation (anti-legionella function) is running.

Troubleshooting Remedy

If this operating mode is selected, the auxiliary heater is used for heating and hot water production, not the compressor.

Check the alarm that is indicated in the display.

Check what the integral value is in the control system.

If AUX. HEATER mode is selected and you no longer want it, change to AUTO, the heat pump then controls both the compressor and auxiliary heater.

Rectify the problem and rest the alarm.

See Operational problems, Page 14.

Check if the heat pump runs peak heat.

If the auxiliary heater is in operation because the integral value has counted down to the start value, the computer reacts as it should, see the Installation instructions for further information.

Peak heat operation occurs in connection with hot water production with the set interval. The compressor should then start to produce hot water and 2 minutes later the auxiliary heater starts.

The compressor must then stop and the stop temperature be reached with only the auxiliary heater connected. Take no corrective action.

28 – Service instructions VMGFJ102

Cause

5. The heat pump has stopped on

HIGH RETURN.

6. The compressor runs backwards.

The incoming phases have the incorrect sequence (only applies to 3phase heat pumps).

If the compressor runs backwards, it will not cope with compressing the refrigerant and therefore does not produce the correct power, which leads to the control system requesting auxiliary heating.

7. Changed conditions Have you increased your heating and/or hot water demand?

Troubleshooting

Check what the MAX RETURN value is set at in the heat pump’s control computer. It must be adjusted to the unit’s maximum supply temperature and the system’s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is 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 Measurement points, Page 11.

If the text ERR PHASE SEQ. appears in the display when the heat pump is powered, (only appears in the first 10 minutes) this means that the phases have the incorrect sequence.

When the compressor is running, check the pressure pipe temperature by feeling the pressure pipe. If the phases are correctly sequenced it should be hot (not just warm) even a distance from the compressor.

When the compressor runs with the phases incorrectly sequenced a strange noise may be heard (loud, rattling) when the compressor runs backwards.

If the heat pump has been dimensioned for a certain demand and this demand is increased, the heat pump might not be able to maintain the desired room temperature.

If hot water consumption increases, a larger proportion of time is used to produce hot water, which means less time for heat production.

Remedy

If the MAX RETURN value is not adjusted for the system according to the troubleshooting window, adjust it.

If the sensor is defective, replace it.

If the phases are in the incorrect order, switch two incoming phases at the main terminal block and recheck according to the troubleshooting window.

If the heat pump cannot cope with the demand, replace it with one with a higher output or supplement it with a higher output auxiliary heater.

Table 25.

Problem – The auxiliary heater is in operation but not the compressor

Cause

1. Operating mode AUX. HEATER is selected.

2. Peak heat operation (anti-legionella function) is running.

3. The compressor cannot run due to an alarm.

Troubleshooting

If this operating mode is selected, the auxiliary heater is used for heating and hot water production, not the compressor.

Check if the heat pump runs peak heat.

Check the alarm that is indicated in the display.

Remedy

If AUX. HEATER mode is selected and you no longer want it, change to AUTO, the heat pump then controls both the compressor and auxiliary heater.

Peak heat operation occurs in connection with hot water production with the set interval. The compressor should then start to produce hot water and 2 minutes later the auxiliary heater starts.

The compressor must then stop and the stop temperature be reached with only the auxiliary heater connected. Take no corrective action, this is normal.

Rectify the problem and rest the alarm.

Service instructions VMGFJ102 – 29

Cause

4. The heat pump has stopped on high return.

5. The compressor has been stopped by the operating pressure switch or delivery line sensor.

6. The compressor runs backwards. The incoming phases have the incorrect sequence (only applies to 3-phase heat pumps). If the compressor runs backwards, it will not cope with compressing the refrigerant and therefore does not produce the correct power, which leads to the control system requesting auxiliary heating.

7. The built-in overheating protection

(bi-metal protection) in the compressor has tripped.

Troubleshooting

Check what the MAX value is set at in the heat pump’s control computer. It must be adjusted to the unit’s maximum supply temperature and the system’s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is 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 Measurement points,

Page 11.

Check if a square appears in the display’s lower left corner. If so, the operating pressure switch is open or the delivery pipe sensor triggers an alarm for too high 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 system in the HEAT PUMP menu. Is it a plausible/actual value? If not, take a resistance reading from the sensor and

check against the ohm table in Measurement points, Page 11.

The compressor has been stopped by the delivery line sensor and you have established that it shows the correct temperature. This may have been caused by a leak in the refrigerant circuit.

If the text ERR PHASE SEQ. appears in the display when the heat pump is powered, (only appears in the first 10 minutes) this means that the phases have the incorrect sequence.

When the compressor is running, check the pressure pipe temperature by feeling the pressure pipe. If the phases are correctly sequenced it should be hot (not just warm) even a distance from the compressor.

When the compressor runs with the phases incorrectly sequenced a strange noise may be heard (loud, rattling) when the compressor runs backwards.

Check if the heat pump’s control computer indicates that the compressor is in operation, and if there is voltage in the soft-starter control inputs. Then read off and check that there is voltage on the compressor’s electrical connection(s).

Remedy

If the MAX RETURN value is not adjusted for the system according to the troubleshooting window, adjust it.

If the sensor is defective, replace it.

If the operating pressure switch has stuck in the open position, try gently tapping on the pressure switch head. If this does not help, or it sticks in the open position repeatedly, replace the pressure switch. If the delivery line sensor is defective, replace it. If the delivery line temperature gets so hot that the compressor stops, start by leak-tracing the unit. Rectify the leak, if a leak is found. If no leak is found, try draining and refilling the unit and then restarting the heat pump and seeing what the delivery line temperature is. If the problem persists, replace the compressor.

If the phases are in the incorrect order, switch two incoming phases at the main terminal block and recheck according to the troubleshooting window.

If there is voltage on the compressor’s electrical connection(s) and the overheating protection does not close when the compressor has not run and has cooled down for at least 1 hour, replace the compressor.

30 – Service instructions VMGFJ102

Table 26.

Problem – The heat pump consumes too much energy

Cause

1. Blocked strainer in the heating system.

2. The compressor cannot run due to an alarm.

3. Incorrect flow over hot side of the heat pump.

4. The heat pump’s control computer is not set/adjusted to the customer’s requirements/wishes.

5. The interval for peak heat operation has changed to a lower value than the factory set value. This results in the heat pump going into peak heat operation more often than calculated.

6. The heat pump has stopped on

HIGH RETURN.

7. The compressor runs backwards.

The incoming phases have the incorrect sequence (only applies to 3phase heat pumps). If the compressor runs backwards, it will not cope with compressing the refrigerant and therefore does not produce the correct power, which leads to the control computer requesting auxiliary heating.

Troubleshooting

Check that the strainer is not blocked.

Remedy

Clean the strainer if necessary.

Check the alarm that is indicated in the display.

Measurement check what the difference between the supply and return line is using a thermometer (∆t). The difference should be about 8°C (can vary depending on refrigerant). A lower ∆t results in reduced efficiency in the heat pump.

Check the ROOM and CURVE and MIN settings.

Check the specified interval for peak heat operation in the control computer.

Rectify the problem and rest the alarm.

See section Alarm, Page 15.

Adjust the system to obtain the correct

∆t.

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.

MIN = Lowest set-point value on the supply line regardless of the outdoor temperature.

If there is a shorter interval between the peak heat productions, this explains why the unit consumes more current than calculated, but this does not mean for sure that it should be increased, there might be a reason why the interval has been changed.

If the MAX RETURN value is not adjusted for the system according to the troubleshooting window, adjust it. If the sensor is defective, replace it.

Check what the MAX RETURN value is set at in the heat pump’s control computer. It must be adjusted to the unit’s maximum supply temperature and the system’s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is 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 Measurement points, Page 11.

If the text ERR PHASE SEQ. appears in the display when the heat pump is powered, (only appears in the first 10 minutes) this means that the phases have the incorrect sequence.

When the compressor is running, check the pressure pipe temperature by feeling the pressure pipe. If the phases are correctly sequenced it should be hot (not just warm) even a distance from the compressor.

When the compressor runs with the phases incorrectly sequenced a strange noise may be heard (loud, rattling) when the compressor runs backwards.

If the phases are in the incorrect order, switch two incoming phases at the main terminal block and recheck according to the troubleshooting window.

Service instructions VMGFJ102 – 31

Cause

8. The compressor has been stopped by the operating pressure switch or delivery line sensor.

9. Expansion valve defective or incorrectly set.

10. Lack of refrigerant, not enough refrigerant in the system.

11. Overfilled refrigerant circuit.

12. Changed conditions Have you increased your heating and/or hot water demand?

Troubleshooting

Check if a square appears in the display’s lower left corner. If so, the operating pressure switch is open or the delivery pipe sensor triggers an alarm for too high temperature.

The operating pressure switch is most easily checked by using a buzzer to see if it is connected.

The delivery line 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 sensor and check against the ohm table in the installation instructions.

The compressor has been stopped by the delivery line sensor and you have established that it shows the correct temperature. This may have been caused by a leak in the refrigerant circuit.

Using manometer apparatus and thermometer check what the overheating reading of the unit is.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

If the heat pump has been dimensioned for a certain demand and this demand is increased, the heat pump might not be able to maintain the desired room temperature.

If hot water consumption increases, a larger proportion of time is used to produce hot water, which means less time for heat production.

Remedy

If the operating pressure switch has stuck in the open position, try gently tapping on the pressure switch head. If this does not help, or it sticks in the open position repeatedly, replace the pressure switch. If the delivery line sensor is defective, replace it. If the delivery line temperature gets so hot that the compressor stops, start by leak-tracing the unit. Rectify the leak, if a leak is found. If no leak is found, try draining and refilling the unit and then restarting the heat pump and seeing what the delivery line temperature is. If the problem persists, replace the compressor.

If the expansion valve is defective, replace it.

If there appears to be a leak in the refrigerant circuit, carry out leak tracing and any necessary corrective action. If leak tracer is not available, brush soap water on the suspected leak and look for bubbles. Also check for oil as this can come out from the refrigerant circuit.

Follow the correct procedure (depending on type of refrigerant) to add the correct amount of refrigerant.

If the heat pump cannot cope with the demand, replace it with one with a higher output or supplement it with a higher output auxiliary heater.

32 – Service instructions VMGFJ102

Table 27.

Problem – Auxiliary heater cuts in too soon

Cause

1. The heat pump’s control computer is not set/adjusted to the customer’s requirements/wishes.

2. Changed conditions Have you increased your heating and/or hot water demand?

3. Lack of refrigerant, not enough refrigerant in the system.

Troubleshooting Remedy

Check the ROOM, CURVE, INTEGRAL A1 and

INTEGRAL A2 settings

If the heat pump has been dimensioned for a certain demand and this demand is increased, the heat pump might not be able to maintain the desired room temperature.

If hot water consumption increases, a larger proportion of time is used to produce hot water, which means less time for heat production.

Using manometer apparatus and thermometer, check that the unit’s overheating is correct for the specific refrigerant.

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 compressor. INTEGRAL A2 = Start value (calculated from A1) for the auxiliary heater.

If the heat pump cannot cope with the demand, replace it with one with a higher output or supplement it with a higher output auxiliary heater.

If there appears to be a leak in the refrigerant circuit, carry out leak tracing and any necessary corrective action. If leak tracer is not available, brush soap water on the suspected leak and look for bubbles. Also check for oil as this can come out from the refrigerant circuit.

Table 28.

Problem – Short operating times despite heating demand

Cause

ROOM and/or CURVE set too high in combination with a heating system with poor circulation due to closed radiator valves, too small elements or insufficient water volume. A tight fitting system with poor pipe dimensions may produce the same phenomena.

Troubleshooting Remedy

Check if the heat pumps starts, if the supply temperature rises quickly whilst nothing happens to the return temperature. If this happens and the heat pump is stopped by the hysteresis function to later quickly drop in temperature (supply) in order to start again, but cannot due to time conditions in regulation, this means that the heat pump cannot transport the heat away from the condenser as it should. In such a case, hysteresis starts and stops the heat pump often.

Adjust ROOM and CURVE if necessary.

Ensure that there is sufficient flow over the condenser and the heating circuit.

Table 29.

Problem – Connection of external AH

Cause Troubleshooting

Incorrectly connected auxiliary heater.

Does not start when the control computer gives the signal.

Check the connection against the instructions/wiring diagram. Test the function in manual mode.

Remedy

If the auxiliary heater is incorrectly connected, reconnect according to the instructions.

Service instructions VMGFJ102 – 33

3.5.7

Heat pump

Table 30.

Problem – Noise/loud noise

Cause

1. Positioning the heat pump.

2. Connection/wall lead-ins.

Troubleshooting

Determine whether the heat pump can be moved to a more suitable location.

Check that the unit is installed according to the instructions.

Remedy

Move the heat pump if possible.

Rigid mountings can generate noise from the heat pump via walls in the house.

Table 31.

Problem – Defrosting problems

Cause

Location/calibration of the outdoor sensor.

Defrost sensor calibration

Troubleshooting

Check that the outdoor sensor is installed according to the installation instructions and that it is correctly calibrated.

Check that the defrost sensor is installed according to the installation instructions and that it is correctly calibrated.

Remedy

Install according to the instructions and calibrate, if necessary.

Calibrate if necessary.

Table 32.

Problem – Build-up of ice under and around the outdoor unit

Cause

Insufficient drainage.

Troubleshooting

Does a lot of ice accumulate under and around the outdoor unit because the melted water has nowhere to run?

Remedy

Drain the ground under and around the outdoor section or install a drainpipe routed to an indoor drain or gully. NOTE!

Install a heating cable in the drainpipe.

Table 33.

Problem – Water run-off by the outdoor unit, risk of moisture problems in house foundations

Cause

Insufficient drainage.

Troubleshooting

During some periods when the outdoor unit is being defrosted, large amounts of water can run off.

Remedy

Drain the ground under and around the outdoor unit so that it can cope with the extra amount of water produced because of defrosting or install a drainpipe routed to an indoor drain or gully.

NOTE! Install a heating cable in the drainpipe.

34 – Service instructions VMGFJ102

VMGFJ102

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Key Features

  • High efficiency and low operating costs
  • Reliable and durable construction
  • Easy to install and maintain
  • Low noise operation
  • Compact design saves space
  • Advanced control system for optimal performance
  • Environmentally friendly refrigerant
  • Multiple safety features for peace of mind

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Frequently Answers and Questions

What are the benefits of using the Danfoss DHP-AQ heat pump?
The Danfoss DHP-AQ heat pump offers a range of benefits, including high efficiency and low operating costs, reliable and durable construction, easy installation and maintenance, low noise operation, compact design, advanced control system for optimal performance, environmentally friendly refrigerant, and multiple safety features for peace of mind.
What is the best way to maintain the Danfoss DHP-AQ heat pump?
To ensure optimal performance and longevity, it is important to regularly maintain the Danfoss DHP-AQ heat pump. This includes tasks such as cleaning the filters, checking the refrigerant levels, and inspecting the electrical connections. It is also recommended to have the heat pump serviced by a qualified technician on a regular basis.
What are the safety features of the Danfoss DHP-AQ heat pump?
The Danfoss DHP-AQ heat pump is equipped with multiple safety features to ensure the safety of users and property. These features include high-pressure and low-pressure switches, a thermal overload protector, and an anti-freeze thermostat.

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