Danfoss DHP-AQ Series, DHP-AQ Maxi, DHP-AQ Mini, DHP-AQ Midi Service Instructions Manual
MAKING MODERN LIVING POSSIBLE
Service Instructions
DHP-AQ
www.heating.danfoss.com
Danfoss A/S is not liable or bound by warranty if these
instructions are not adhered to during installation or service.
The English language is used for the original instructions.
Other languages are a translation of the original instructions.
(Directive 2006/42/EC)
© Copyright Danfoss A/S
Service Instructions DHP-AQ
Table of Contents
1 About documents and decals ........................................................ 4
1.1 Introduction ................................................................ 4
1.2 Symbols in documents .......................................................... 4
1.3 Symbols on decals ............................................................ 4
2 Important information/Safety regulation ................................................ 6
2.1 General safety precautions ....................................................... 6
2.2 Refrigerant ................................................................. 7
2.3 Electrical connection ........................................................... 8
2.4 Water quality ................................................................ 8
2.5 Commissioning .............................................................. 9
3 Troubleshooting ................................................................. 10
3.1 Alarm ..................................................................... 10
3.2 Components ................................................................ 11
3.3 Measurement points ........................................................... 12
3.4 Check points ................................................................ 14
3.5 Operational problems .......................................................... 15
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DHP-AQ
1 About documents and decals
1.1 Introduction
The following documents are available for this product:
Installation quick guide containing information to install a heat pump. Supplied with the heat pump on delivery.
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The Service instructions contain information about the heat pump’s function, accessories, fault tracing and technical data. The in-
▪
structions also contain tips and advice that should be followed before a heat pump installation. It is therefore recommended that
the instructions are read before installation. The Service instructions are available for download as below.
The Wiring diagrams that contain the wiring diagram for the heat pump intended for fault tracing and service. The Wiring diagrams
▪
are available for download as below.
The User manual must handed over and gone through with the end customer. Supplied with the heat pump on delivery.
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Country specific instructions and forms are available where relevant. Supplied with the heat pump on delivery.
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Self-adhesive decals with translation text. Must be placed on the manufacturing plate in conjunction with installation. Supplied
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with the heat pump on delivery.
The Service instructions and Wiring diagrams are available for download here:
www.documentation.heatpump.danfoss.com
1.2
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:
A fourth symbol is used to give practical information or tips on how to perform a procedure.
Symbols in documents
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.
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.
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!
3
50
54
55
71
353
362
304
363
365
366
406
62
408
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Service Instructions
1.3.1 General
DHP-AQ
Warning, danger!
Read the documentation provided.
Read the documentation provided.
Warning, hazardous electrical voltage!
1.3.2 Electrical components
Outdoor unit
Outdoor sensor
Hot water sensor
Hot water top sensor
Flow guard
Drip tray
Shunt valve
Circulation pump
Exchange valve hot water
Supply line sensor
Return line sensor
Warning, hot surfaces!
Warning, moving parts!
Warning, risk of crushing injury!
Room sensor
or
EVU
Defrost sensor
Explanation
Component, ordinary delivery according to proposed system solutions
Component, accessorie according to proposed system solutions
1.3.3 Pipe connections
Tap water
Heating system
Brine system
Defrosting tank
Expansion tank with safety valve, brine
Air bleeding
Temperature and pressure relief valve
Outdoor unit
Water heater
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2 Important information/Safety regulation
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 The heat pump must be located in a frost-free environment!
Caution The heat pump must be placed in an area with a floor drain.
Caution The heat pump must be located on a stable base. The floor must be able to support the gross weight of the
heat pump with filled hot water tank (see Technical data).
Caution To prevent leaks, ensure that there are no stresses in the connecting pipes!
Caution It is important that the heating system is bled after installation.
Caution Bleed valves must be installed where necessary.
Caution The hot water tank must be equipped with an approved safety valve.
Caution Heating systems with closed expansion tanks must also be supplied with approved pressure gauges and safe-
ty valves.
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Caution Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant and corro-
sion-resistant material, for example copper. The safety valve overflow pipes must have an open connection to
the drain and visibly flow into this in a frost-free environment.
Caution The connecting pipe between the expansion tank and the safety valve must slope continuously upwards. A
continuous upwards slope means that the pipe must not slope downwards from the horizontal at any point.
Caution When cooling it is important to limit the lowest flow line temperature to prevent condensation.
If there is any risk of groundwater infiltration at wall lead-ins for brine pipes, watertight grommets must be
used.
In addition to applicable local rules and regulations the installation should be carried out in a manner that
prevents vibrations from the heat pump being transmitted into the house causing noise.
2.2 Refrigerant
2.2.1 Refrigerant
Caution Work on the refrigerant circuit must only be carried out by a certified engineer!
Although the heat pump cooling system (refrigerant circuit) is filled with a chlorine-free and environmentally-approved refrigerant that
will not affect the ozone layer, work on this system may only be carried out by authorized persons.
2.2.2
Fire risk
The refrigerant is not combustible or explosive in normal conditions.
2.2.3
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 venti-
lated.
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.
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2.2.4 Work on the refrigerant circuit
Caution When repairing the refrigerant circuit, the refrigerant must not be released from the heat pump, it must trea-
ted in the appropriate way.
Draining and 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 refriger-
ant, if there has not been written notification that the new refrigerant is an approved replacement refrigerant
together with other remedies.
2.2.5 Scrapping
Caution When the heat pump is to be scrapped the refrigerant must be extracted for disposal. Local rules and regula-
tions related to the disposal of refrigerant must be followed.
2.3 Electrical connection
Warning Hazardous electrical voltage! The terminal blocks are live and can be highly dangerous due to the risk of elec-
tric 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.
Caution Electrical installation may only be carried out by an authorized electrician and must follow applicable local
and national regulations.
Caution The electrical installation must be carried out using permanently routed cables. It must be possible to isolate
the power supply using an all-pole circuit breaker with a minimum contact gap of 3 mm. (The maximum load
for externally connected units is 2A).
2.4 Water quality
Caution A normal heating system always contains a certain amount of corrosion particulates (rust) and sludge prod-
ucts 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.
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2.5 Commissioning
Caution The installation may only be commissioned if the heating system and brine system have been filled and bled.
Otherwise the circulation pumps can be damaged.
Caution If the installation is only to be driven by the immersion heater during the installation, ensure that the heating
system is filled and the brine pump and compressor cannot be started. This is carried out by setting the operating mode to AUX. HEATER.
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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 Meaning
MOTOR P COMP.ERROR The compressor motor protection has deployed.
MOTOR P FAN ERROR The fan motor protection has deployed.
EL. HEATER ERROR The electrical heater overheating protection has deployed.
HEAT / PRESSURE ERROR The expected pressure and temperature change in the refrigerant circuit has not happened in the
correct way at compressor start.
LOW PRESSURE ERROR Evaporation pressure has fallen too low.
LOW PRESSURE TRANSDUCER Fault in low pressure transmitter alternatively cable fault.
HIGH PRESSURE ERROR High pressure switch has deployed.
LOW HEAT CIR. FLOW The flow sensor has registered too low a flow.
MAX TEMP ELEC. HW Too high temperature in heat pump junction box/electrical cabinet.
NO. OF TRIES X/5(where X=1…5) Circulation pump is jammed. Start attempt made.
HEATING CIRC. PUMP Circulation pump is jammed.
HEATING SYSTEM PUMP Circulation pump is jammed.
OUTDOOR SENSOR Sensor fault alternatively cable fault.
DEFROST SENSOR Sensor fault alternatively cable fault. Defrost sensor.
SUPPLY LINE SENSOR Sensor fault alternatively cable fault. Supply line sensor.
SYSTEM SUPPLY LINE SENSOR Sensor fault alternatively cable fault. System supply line sensor.
RETURN LINE SENSOR Sensor fault alternatively cable fault. Return line sensor.
HIGH RETURN LINE TEMP Return line temperature too high
BUFFER TANK SENSOR Sensor fault alternatively cable fault.
HGW SENSOR Sensor fault alternatively cable fault.
HOT WATER SENSOR Sensor fault alternatively cable fault (the lower sensor, Start sensor).
HOT WATER TOP Sensor fault alternatively cable fault.
FAILSAFE MODE Sensor fault alternatively cable fault on one of the refrigerant sensors. The heat pump goes to fail-
safe mode and defrosts on time.
REFR.1 SENSOR Sensor fault alternatively cable fault. Refrigerant sensor 1
REFR.2 SENSOR Sensor fault alternatively cable fault. Refrigerant sensor 2
LOW RETURN TEMP 1 The return line temperature is too low to start a defrosting.
LOW RETURN TEMP 2 The return line has fallen too low during defrosting.
LOW EVAP. TEMP 1 Evaporation temperature too low.
LOW EVAP. TEMP 2 Too great a deviation in evaporation temperature average value.
SUCTION TEMP SENSOR Sensor fault alternatively cable fault.
ROOM SENSOR Sensor fault alternatively cable fault.
DISCHARGE PIPE SENSOR Sensor fault alternatively cable fault.
DISTR. CIR. 1 SENSOR Sensor fault alternatively cable fault.
DISTR. CIR. 2 SENSOR Sensor fault alternatively cable fault.
POOL SENSOR Sensor fault alternatively cable fault.
COM. ERROR HP-CARD Communication broken between display card and heat pump card (outdoor).
COM. ERROR HUB-CARD Communication broken between display card and hub card (indoor).
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Message Meaning
COM. ERROR EXV-CARD Communication broken between display card and expansion valve control card (outdoor).
COM. ERROR EXPANSION CARD Communication broken between display card and expansion card (indoor).
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
Fig. 1: Components
Position
Name Position Name
1 Electrical cabinet 11 Electronic expansion valve
2 Fan 12 Receiver
3 Pressure transmitter 13 Drying filter
4 Suction line 14 Heat exchanger
5 Compressor 15 Flow sensor
6 High pressure switch 16 Heating system supply line
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