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Summary of Contents for Danfoss Heat Pump
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Page 1: Table Of Contents
Technical documentation | Air and ground source heat pumps Looking for support? Heat Pump Troubleshooting Guide Error phase sequence Alarm communication Working pressostat and high pressure pipe Alarm Aux.heater Alarm high pressure Sound Alarm low pressure Temperature or the quantity of hot water... -
Page 2: Error Phase Sequence
The discharge pipe must be hot (not lukewarm) even slightly away from the compressor if the phases are in the correct sequence. If the phases are in the incorrect order, switch two of the incoming phases to the heat pump. -
Page 3: Working Pressostat And High Pressure Pipe
Check that both the cables for the operating pressure switch are in position If the pressure switch is closed, bridge the operating pressure switch cables temporarily and switch on the voltage to the heat pump again. if the compressor now starts in auto or in manual test there might be a fault in the operating pressure switch, replace the operating pressure switch. - Page 4 Troubleshooting Guide Working pressostat and high pressure pipe Hot gas temperature too high See in service under heat pump also check using own digital thermometer. Action: Check the refrigerant circuit see section below Discharge pipe sensor location The discharge pipe sensor displays correctly but still has high overheating Action: Using manometer apparatus and a digital thermometer check what the cooling and overheating reading of the unit is.
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Page 5: Alarm High Pressure
Run the circulation pump in manual mode and listen for air. Switch between hot water and heating modes to check the whole heating system. Bleed the heating system according to the heat pump installation instructions. Closed taps or partially closed thermostats/valves in the heating system Action: Open any closed taps. - Page 6 The image shows pressure switches The operating pressure switch does not open but the heat pump opens at high pressure Action: Check that the operating pressure switch opens at the correct pressure, check using manometer apparatus.
- Page 7 Check for timer-controlled shunts or valves in the system that close down the entire or too large a part of the heating system. Ensure that there is a sufficiently large water volume for the heat pump to work against, i.e. for the heat pump to give off its heat to. ( approx ).
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Page 8: Alarm Low Pressure
Air in the brine circuit Action: Start the brine pump in manual mode and listen for air in both the brine circuit and the heat pump. If necessary, bleed according to the installation instructions The circulation pump for the brine circuit is defective or has jammed... - Page 9 Check the length of the collector that is being used and compare with the collector length in the dimensioning documentation. If the active collector is too short, the heat pump cannot receive enough energy from the heat source, which results in the heat pump requiring an addition to cover the energy requirement for the building.
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Page 10: Alarm Motor Protection
If phoenix flat spring terminals are used, the cables must be secure in the correct hole with load on the cable. Disconnect the cables from the incoming terminal block for the heat pump, ensure that they are correctly stripped. If any of the phases are not present, check backwards towards the building’s main electrical cabinet. If the phase is missing there, contact the network supplier. - Page 11 Troubleshooting Guide Alarm motor protection Defective or incorrectly set motor protection Action: Use a hook-on ammeter to establish when the motor protection deploys, check what the motor protection is set to. Compare with table. To ensure that the alarm deploys ”mechanically” one can twin the red and the white cable that are marked 95-96 on the motor protection (see image).
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Page 12: Alarm Circulation Pump
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. -
Page 13: Alarm Brinepump
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. -
Page 14: Alarm Brine
Alarm Brine Action: Check the set value on ALARM BRINE in the heat pump’s control computer under service-heat pump-temperatures-alarm brine. Check that the brine sensor displays the correct value! See section sensor. The alarm is triggered when the temperature on BRINE OUT is as low or lower than the set value on ALARM BRINE. In the factory setting this function is inactive. -
Page 15: Alarm Sensor
When measuring the resistance of the sensor the sensor must be released before measuring! If a fault in the outdoor sensor is suspected, check that the cable between the heat pump and outdoor sensor is not damaged in anyway by nails, pins or another cable securing device. This is a commonly occurring fault. -
Page 16: Alarm Communication
Newer heat pumps with 901 921 display card (Control card) have all thinking/functions in the display. So if the communication between the display card and the relay card drops the heat pump will stop, while older heat pumps produced before Autumn 2008 will run as usual with the most recent setting. -
Page 17: Alarm Aux.heater
Troubleshooting Guide Alarm Aux. heater Phase drop Action: Check that there is 230 V between incoming L2 on the circuit board and neutral on block 220. Check if the overheating protection has tripped. Check if any cables at the circuit board or overheating protection are loose or damaged. Check that the thin, gas filled wire to the bulb is intact. -
Page 18: Sound
Check that there is 400V between incoming phases on the heat pump. Check that there is supply to the heat pump, measure the voltage for all electrical components all the way to the compressor. In event of phase drop, check where the phase drop is and rectify. - Page 19 Troubleshooting Guide Alarm Sound The compressor’s IPR valve opens Action: When the valve opens, this is indicated by the pressure on the low pressure side rising and reaching the pressure of the high pressure side. Check at what pressure the valve starts to open. The compressor has an integrated IPR valve that opens at 28 ±3 bar.
- Page 20 Action: All pipes should be routed in such a way that vibrations cannot be transmitted from the heat pump through the piping and out into the building. This also applies to the expansion pipe. To prevent transmitting vibration it is recommended that flexible hoses are used for all pipe connections.
- Page 21 Vibration noise from the electrical installation Action: Check for electrical steps or similar devices screwed to the heat pump and wall. These can cause vibrations and noise. The heat pump is not level Action: Check that the heat pump is level by using a spirit level, if necessary adjust the heat pump feet...
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Page 22: Temperature Or The Quantity Of Hot Water
Troubleshooting Guide Temperature or the quantity of hot water Defective 3-way valve motor Action: Check that the motor can be run to the limit positions in a manual test. If it is still, measure at the molex switch to see if there is current to it. Measure between 2 and 3 where there should always be 230V and between 2 and 6 where there should be 230V in switching mode If there is voltage replace the motor. - Page 23 Heat loss in the hot water pipe Action: The temperature differential measured between the heat pump and drain point should not be more than max 1-2 degrees. Examples of heat loss causes that can be remedied: Uninsulated hot water pipes - insulate the pipes Too low temperature set on mixing valve –...
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Page 24: Thermal Comfort
The house heating comfort is not adjusted to the customer’s requirements Action: Check the ROOM, CURVE and MIN 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 is maintained regardless of the outdoor temperature. - Page 25 Troubleshooting Guide Thermal comfort Defective Honeywell 3-way valve Action: The motor should set the valve to the relevant end position depending on operating conditions. If it does not, hot water from the water heater will mix with the radiator water. Check the function of the 3-way valve motor by test running it manually.
- Page 26 Troubleshooting Guide Thermal comfort Defective G2 shunt (HGW) Action: Check the function of the HGW shunt by test running it manually. If the motor does not shift mode during manual test operation, check that there is voltage to the motor. Terminal 221 brown/N (- signal open to RAD) 230Vac Terminal 222 black/N (+ signal open to HW) 230Vac Remember to measure with and without load.
- Page 27 Troubleshooting Guide Thermal comfort Basic setting G2 shunt + motor Action: Important to reset the shunt after taking the shunt apart! The groove of the white six edged sleeve must be towards 3 o’clock in unaffected mode. Adjust the motor as illustrated. Then screw the motor into place and press the knob to Auto mode. Manual mode when the button is not pressed in.
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Page 28: High Operating Time Additional Heater
Only runs on the additional heat Action: Ensure that the heat pump is not in additional heater only mode. If additional heater only mode is selected change to auto, the heat pump then regulates both the compressor and the additional heater. - Page 29 Check the difference between the supply and return line using a digital thermometer. The difference should not be more than 4°C . A greater delta-t results in reduced efficiency in the heat pump. If the difference is greater than 4°C note what is causing it.
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Page 30: Outdoor Unit And Defrosting Problems
15 degrees out and 11 degrees in. During defrosting the compressor stops if it runs against the heating system. If the heat pump runs against the hot water when the defrosting starts the compressor continues to run. - Page 31 Troubleshooting Guide Outdoor unit and defrosting problems Outdoor sensor/Defrost sensor Action: Check that the outdoor sensor/defrost sensor is installed according to the installation instructions and that it is correctly calibrated. Measure the ohms at the sensor to check it displays the correct value. temperature 1884 1443...
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Page 32: Room Sensor Digital
The cable is screwed in (2-core can be connected on any terminal, max 100m) The terminal block is reinstalled on the pin and the cover installed. In the heat pump the room sensor must be connected to terminal 303-304, does not apply to Atec or Robust. See wiring diagram for relevant heat pump. -
Page 33: Electric Hot Water Heaters
Troubleshooting Guide Electric hot water heaters Water does not get hot Action: Check fuse(s). Check if there is cold water supply, if not, check why and rectify the fault. Check if the overheat protection has tripped, reset by pressing the button until it clicks. Extremely long heating time Action: Check fuses so that all are intact at heaters with two phases or three phases. - Page 34 Danfoss Värmepumpar AB • 671 33 Arvika • Sweden • Tel.: + 46 570 813 00 • E-mail: heating@danfoss.com • heating.danfoss.com Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
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