Danfoss ADAP-KOOL AK-HP 780 Design Manual
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Danfoss ADAP-KOOL AK-HP 780 Design Manual

Danfoss ADAP-KOOL AK-HP 780 Design Manual

Heat pump controller with oil management, refrigeration control systems
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Design Guide
Heat pump controller
with oil management
AK-HP 780
ADAP-KOOL® Refrigeration control systems

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Summary of Contents for Danfoss ADAP-KOOL AK-HP 780

  • Page 1 Design Guide Heat pump controller with oil management AK-HP 780 ADAP-KOOL® Refrigeration control systems...

  • Page 2: Table Of Contents

    Safety functions ................88 Wiring ......................40 Oil management................90 Pump ......................92 General monitoring functions ............93 Miscellaneous ..................94 Appendix A – Compressor combinations and coupling pat- terns ......................97 Appendix B - Alarm texts ..............102 Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 3: Introduction

    - Plus some completely separate functions that are totally in- dependent of the regulation – such as alarm, thermostat and pressure control functions, safety functions at cold start up, P0 Compressor control limitation. Pump control Oil management SW = 1.4x AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 4: Principles

    A regulation with few connections can If there are many connections one or more Examples be performed with the controller module extension modules have to be mounted alone Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 5 A total of 4 displays can be fitted and with one setting it is pos- sible to choose between the following readings: suction pressure, suction pressure in temperature,, Sctrl, Ss, Sd, discharge pressure, discharge pressure in temperature and S7. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 6 If you want to know more about a current alarm you can click on it and obtain an information display on the screen. A corresponding display exists for all earlier alarms. Here you can upload information if you need further details about the alarm history. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 7: Design Of A Controller

    This section will give you a survey of possible connections plus assistance in selecting the modules required by your actual application. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 8: Module Survey

    The module with additional relay outputs is also available in a version where the top part is provided with change-over switches so that the relays can be overridden. Extension module with 2x analog output signals Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 9 Real time clock for use in controllers that require a clock function, but are not wired with data communication. AK-OB 101A Real time clock with battery backup. To be mounted in an AK controller On the following pages there is data specific to each module. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 10: Common Data For Modules

    The relays cannot be used for the direct connection of capacitive loads such as LEDs and on/off control of EC motors. All loads with a switch mode power supply must be connected with a suit- able contactor or similar. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 11 Modules in the 100-series consist of one module Modules in the 200-series consist of two modules Controllers consist of three modules The length of an aggregate unit = n x 72 + 8 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 12: Controller

    A small module (option board) can be placed on the bottom part • Alarm when LED flashes of the controller. The module is described later in the document. - 3 LED’s that are not used • “Service Pin” switch has been activated Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 13 42 - 43 - 44 valve 18 (DO7) 45 - 46 - 47 19 (DO8) 48 - 49 - 50 Option Board Please see the signal on the page with the module. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 14: Extension Module Ak-Xm 101A

    5 V output or the 12 V output depending on transmitter type. Light-emitting diodes Only the two top LED’s are used. They indicate the following: • Voltage supply to the module • Communication with the controller is active (red = error) Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 15 5 (AI 5) 17 - 18 Closed switch Day/ 6 (AI 6) 19 - 20 Open Night Level 7 (AI 7) 21 - 22 switch 8 (AI 8) 23 - 24 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 16: Extension Module Ak-Xm 102A / Ak-Xm 102B

    • Communication with the controller is active (red = error) Off: DI < 2 V a.c. Off: DI < 24 V a.c. • Status of the individual inputs 1 to 8 (when lit = voltage) Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 17 5 - 6 4 (DI 4) 7 - 8 5 (DI 5) 9 - 10 6 (DI 6) 11 - 12 7 (DI 7) 13 - 14 8 (DI 8) 15 - 16 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 18: Extension Module Ak-Xm 204A / Ak-Xm 204B

    Without this safety relay, the controller will fail to stop the compressor if it should run out of oil. See Regulating functions. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 19 34 -36 5 (DO 5) 37 - 39 6 (DO 6) 40 - 41 - 42 7 (DO 7) 43 - 44 - 45 8 (DO 8) 46 - 47 - 48 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 20: Extension Module Ak-Xm 205A / Ak-Xm 205B

    Without this safety relay, the controller will fail to stop the compressor if it should run out of oil. See Regulating functions. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 21 13 (DO 5) 37 - 36 - 39 Alarm 14 (DO6) 40 - 41 - 42 Solenoid valve 15 (DO7) 43 - 44 - 45 16 (DO8) 46 - 47 - 48 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 22: Extension Module Ak-Ob 110

    The two outputs have points 24 and 25. They are shown on the earlier page where the controller is also mentioned. Max. load I < 2.5 mA R > 4 kohm Module Point 0 - 10 V Type Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 23: Extension Module Ak-Ob 101A

    The working life of the battery is several years – even if there are frequent power failures. An alarm is generated when the battery has to be replaced. After the alarm there are still several months of operating hours left in the battery. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 24: Extension Module Eka 163B / Eka 164B

    The extension module can be placed at a distance of up to 15 m from the controller module. Module Point Point No point has to be defined for a display module – you simply con- Type nect it. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 25: Power Supply Module Ak-Ps 075 / 150

    24 V d.c. 1.5 A 36 VA (adjustable) Connections Dimension Type High Width AK-PS 075 90 mm 36 mm AK-PS 150 90 mm 54 mm Supply to a controller AK-PS 075 AK-PS 150 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 26: Preface To Design

    If the alarm is to be sent to a signal transmitter, a relay output will The controller module has terminals for LON data communication. have to be used. The requirements to the installation are described in a separate document. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 27: Connections

    ✔ No more than 5 pressure transmitters may be connected to one extension module. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 28: Design Of A Compressor And Pump Control

    Different compressor capacities Max. input and output Sequential operation (first in / last out) Speed regulation of 1 compressor or 2 parallel compressors Run time equalisation Min. restart time Min. On-time Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 29: Connections

    Up to 10 no. extra on/off signals for general alarm for monitoring and data collection can be connected. On/off-outputs Relay outputs • Compressors • Unloaders • Pump • Start/stop of liquid injection in heat exchanger AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 30 • SH min = 5 °C, SH max = 35 °C • Monitoring of low and high level in oil receiver Other: • Alarm output used • External main switch used Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 31: Planning Table

    ___ pcs. á 5 VA = __ AK_OB 110 (2 analog outputs) ___ pcs. á 0 VA = 0 1 pcs. á 8 VA = 8 Sum = Sum = max. 32 VA AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 32: Length

    DIN rail – no matter where in the row the module is found. Removal is likewise carried out with the two catches in the open position. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 33: Determine The Connection Points

    7 - 8 Open 5 (DI 5) 9 - 10 All compressors common safety 6 (DI 6) 11 - 12 Open 7 (DI 7) 13 - 14 8 (DI 8) 15 - 16 AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 34: Connection Diagram

    Drawings of the individual modules may be ordered from Danfoss. Format = dwg and dxf. You may then yourself write the module number in the circle and draw the individual connections. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 35: Supply Voltage

    The + and – 24V input must not be earthed. Example continued: Controller module 8 VA + 1 extension modules in 200-series 5 VA + 1 extension module in 100-series 2 VA ------ Transformer size (least) 15 VA AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 36: Ordering

    Real time clock for use in controllers that require a clock function, but are not wired with data communication. 080Z0252 AK-OB 101A Real time clock with battery backup. To be mounted in an AK controller Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 37: Mounting And Wiring

    We have decided to work on the basis of the example we went through previously, i.e. the following modules: • AK-HP 780 controller module • AK-XM 205A input and output module • AK-XM 102B digital input module • AK-OB 110 analog output module AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 38: Mounting

    Lift the top part off the basic module. 2. Mount the extension module in the basic module There are two outputs. 3. Put the top part back on the basic module Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 39: Mounting Of Extension Module On The Basic Module

    DIN rail – regard- less of where the module is on the row. Disassembly is thus done with the two snap catches in the open posi- tion. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 40: Wiring

    7 - 8 Open 5 (DI 5) 9 - 10 6 (DI 6) 11 - 12 All comp. common safety Open 7 (DI 7) 13 - 14 8 (DI 8) 15 - 16 Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 41 The connections for the example can be seen here. Warning Keep signal cables separate from cables with high voltage. The screen on the pressure transmit- ter cables must only be connected at the end of the controller. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 42 ■ Service Pin 5. When there is a network Network installation Set the address and activate the Service Pin. Status on output 1-8 6. The controller is now ready to be configured. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 43: Configuration And Operation

    We have decided to work on the basis of the example we went through previously, i.e. compressor control with 4 compressors and control of one pump. The example is shown overleaf. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 44 For the example shown we use the following modules: • AK-HP 780 controller • AK-XM 102B digital input module • AK-XM 205B input and output module • AK-OB 110 analog extension module Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 45: Configuration

    The red alarm bell at the bottom right tells you that there is an active alarm in the controller. In our case the alarm is due to the fact that the time in the controller has not yet been set. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 46: Authorization

    You will access the login display by pressing the padlock at the top left new access code corner of the display. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 47: Unlock The Configuration Of The Controllers

    The values can be changed when it is locked, but only for those settings that do not affect the configuration. 2. Select Lock/Unlock configuration 3. Select Configuration lock Press the blue field with the text Locked 4. Select Unlocked Select Unlocked and press OK. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 48: System Setup

    When the time is set the PC’s time can be transferred to the controller. When the controller is connected to a network, date and time will automatically be set by the system unit in the network. This also applies to change-over Daylight saving. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 49: Set Plant Type

    In the example, we select this set-up mode to get through the descrip- tions of the functions. Further settings: External main switch to Yes Use Alarm output to High. (At ”High” the relay is only activated for high-priority alarms). AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 50: Set Control Of Compressors

    Press the +-button to go on to the Set max capacity limit for load shed input 1 next page Load shed limit 2 Set max capacity limit for load shed input 2 Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 51 P0 Limit Regulation parameter which protects against low suction pressure. P-band (above P0 limit) Press the +-button to go on to the Regulation parameter which protects against low suction next page pressure. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 52 If the restrictions overlap, the controller will use the longest restriction time. Press the +-button to go on to the next page 11. Set Misc. functions In our example we do not use these functions. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 53: Set Oil Management

    (Forced con- trolled to ON with the setting "Manual" or with the "changeover" on an extension module.) Danfoss recommends this function to avoid any compressor damages due to lack of care. In our example, oil management is selected (In order to keep things simple, this function is not used as an example.)
  • Page 54 ("high" level contact not activated) No of periods No. of times the valve should open in emptying sequence Period time Time between valve openings. Open time The open time of the valve Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 55: Setup Control Of The Pump

    Choice of safety monitoring of frequency con- verter. A digital inlet is used for monitoring the frequency converter. 4. Set values for capacity regulation We select "speed" in our example. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 56: Setup Display

    Comp. control sensor P0 bar (abs) Sctrl Cond. control sensor Pd bar (abs) Unit readout Choose whether readings are to be in SI units (°C and bar) or (US-units °F and psi) Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 57: Setup General Alarm Inputs

    No. of inputs Set the number of digital alarm inputs Adjust for each input • Name • Delay time for DI alarm (common value for all) • Alarm text AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 58: Setup Separate Thermostat Functions

    Indicate alarm text for low alarm 4 - Pressostats Settings as the thermostats 4. Define the required pressostat function Via the +- button you can move to similar settings for the pressure control functions. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 59: Setup Separate Voltage Functions

    For each voltage input defined the controller will reserve a relay output in the I/O setup. It is not necessary to define this relay if all you require is an alarm message via the data communication. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 60: Configuration Of Inputs And Outputs

    Open has been selected here for all the safety circuits. This means that the controller will receive signal under normal operation and register it as a fault if the signal is interrupted. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 61 Saux 1 - 4 Paux 1 - 3 Volt input 1 - 5 • 0 -5 V, • 0 -10 V, • 1 – 5 V, • 2 – 10 V AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 62: Set Alarm Priorities

    Se also alarm text page 102 Press the +-button to go on to the next page 4. Set alarm priorities for the pump In our example we select the settings shown here in the display Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 63 Press the +-button to go on to the next page 5. Set alarm priorities for thermostat and extra digital signals In our example we select the settings shown here in the display AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 64: Lock Configuration

    The controller will now make a comparison of selected func- tions and define inputs and outputs. The result can be seen in the next section where the setup is controlled. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 65: Check Configuration

    0 and point number to 0. Remember that the setup must be unlocked be- fore you can change module and point numbers. Press the +-button to go on to the next page AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 66 Press the +-button to go on to the next page 6. Check configuration of Analog Inputs The setup of the analog inputs appears as it is supposed to according to the wiring made. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 67: Check Of Connections

    Check that the value of the alarm for the safety monitoring of compres- sor 1 changes to ON. The remaining digital inputs are checked in the same way. Press the +-button to go on to the next page AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 68 In our case we have no values. This may be due to the following: • The sensor has not been connected. • The sensor is short-circuited. • The point or module number has not been set up correctly. • The configuration is not locked. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 69: Check Of Settings

    – the ones that can only be seen via the ”Scroll bar”. The last page contains safety limits and restart times. 4. Safety limits 5. Go back to the overview 6. Select the pump AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 70 10. Go back to the overview and Move on to the press- sostat group Check the settings. 11. Go back to the overview and on to the general alarm inputs Check the settings. 12. The controller setup has been completed. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 71: Schedule Function

    3. Setup schedule Press a weekday and set the time for the day period. Continue with the other days. A complete weekly sequence is shown in the display. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 72: Installation In Network

    The wiring has not been carried out correctly. The termination has not been carried out correctly. The data communication requirements are described in the document: ”Data communication connections to ADAP-KOOL® Refrigeration Con- trols” RC8AC. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 73: First Start Of Control

    Please note that active plant alarms are automatically cancelled when the main switch is in pos. OFF. If active alarms appear when the control is started the reason for these should be found and remedied. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 74: Start Control

    Press in the field against Main switch. Select ON. Press OK. The controller will now start controlling the compressors and the fans. Note: Control does not start until both the internal and external switch are “ON”. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 75: Manual Capacity Control

    Press the blue field against Control mode Select MAN. Press OK. 4. Set capacity in percent Press in the blue field against Manual capacity. Set the capacity to the required percentage. Press OK. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 76 Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 77: Regulating Functions

    5. Regulating functions This section describes how the different functions work AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 78: Suction Group

    P0 signal, though in accordance with a reference that is 5 K below the real reference. If an error occurs in the both Sctrl and P0, the regulation will be stopped. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 79: Reference

    If the forced operation is done with the switch-over on the front of an expansion model, this is not registered by the control func- tion and no alarm is sounded. The controller continues to run and couples with the other relays. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 80: Capacity Control Of Compressors

    The Integrator is looking at the deviation between the set point and the current temperature only and increases/reduces the requested capacity correspondingly. The amplification factor Kp on the other hand only looks at the temporary temperature changes. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 81: Compressor Timers

    NZ. In the controller the readout “Actual band” will show in which zone the PI controller is operating – this includes the extension of the zones. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 82: Capacity Distribution Methods

    - At the different stops the compressor with the highest number of operating hours will be stopped first. - For compressors with several steps, the operating time equalizing is carried out between the compressors’ main steps. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 83: Power Pack Types - Compressor Combinations

    The following is a description of some general rules for handling capacity-regulated compressors, speed-regulated compressors and also for two speed-regulated compressors. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 84 The capacity step will now be cut in and the required capacity determined by the controller. The start speed always ought to be set so high that a fast lubrication of the compressor is obtained during the start. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 85 8) The speed controlled compressor will increase speed until the total capacity reaches 60 kw at max speed 9) When reducing capacity the one step compressors will be cut out when the speed on C1 is at minimum speed. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 86 Afterwards, both compressors will be cut in together and will run in parallel. The following one-step compressors will be cut in and out in accordance with the selected coupling pattern. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 87: Load Shedding

    This alarm can however be suppressed if so desired. 10 kW and 20 kW respectively - Frequency range of 25-60 Hz - Two one-step compressors of 20 and 40 kW respectively AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 88: Safety Functions

    A common safety signal can also be received from the whole suction group. All - the pressure (temperature) is above the cutout limit compressors will be cut out when the safety signal cuts out. - the time delay has elapsed (see later). Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 89 An alarm limit can be set which will become effective when the suction pressure becomes too high. An alarm will be transmitted when the set time delay has been passed. The regulation continues unchanged. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 90: Oil Management

    If the oil level is deemed to be OK again, the alarm will be cancelled and the compressor can restart. If an OK on oil level is absent, the compressor will stop and can then only be manually started using the reset function. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 91 This can be done via a pulse pressure on a defined input. There is one reset and this applies to all compressors. Upon reset, all the counters are reset. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 92: Pump

    The proportional band Xp indicates the deviation at 100% condenser capacity. Regulating sensor S7 is used as a regulating sensor. The set point for the S7 temperature is set in °C. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 93: General Monitoring Functions

    The individual pressure control function can be adapted to the relevant application as it is possible to give the pressure control a name and indicate alarm texts. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 94: Miscellaneous

    • “High’ – Alarm relay is activated only with alarms with high priority • “Low - High’ – Alarm relay is activated only with alarms with “low” priority, “medium” or “high” priority. Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 95 As a tool for documentation and fault-finding, the controller c) Select user level provides the possibility of logging of parameter data in the d) Select units – either US (e.g. °F and PSI) or Danfoss SI (°C and internal memory. Bar)
  • Page 96 Flash = active alarm/not cancelled ■ DO6 Constant ON = Active alarm/cancelled Cutin pump capacity in % ■ DO7 ■ DO8 ■ Service Pin Reference for pump capacity in % Network installation Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 97: Appendix A - Compressor Combinations And Coupling Patterns

    - The capacity controlled compressor is the first to start and the last to stop. - Unloader valves are used to close capacity holes - There is operating time equalizing between the compressors 2 and 3 (same size in example). AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 98 Here, the one-step compressors are of the same size. The speed-regulated compressor is always the first to start and the last to stop. One-step compressors should be cut in and cut out in accordance Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 99 (90 Hz), the smallest one-step compressor is cut out (C2) and the big one-step compressor (C3) is cut in. - When the speed-regulated compressor again reaches max speed (90 Hz), the smallest one-step compressor (C2) is cut in again. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 100 (least possible capacity jump). Handling the speed-regulated compressor. For more information on the general handling of the speed-regu- lated compressors, refer to section "Power pack types". Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...
  • Page 101 - When the one-step compressors are cut out, the speed-regulat- ed compressors' speed increases (63.3 Hz) equivalent to the cut ed compressors' speed increases (63.3 Hz) equivalent to the cut out capacity. out capacity. AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...

  • Page 102: Appendix B - Alarm Texts

    Oil level is too low in receiver Recv. High pressure alarm Pressure too high in receiver Rec. high pressure Medium Recv. Low pressure alarm Pressure too low in receiver Rec. low pressure Medium Heat pump controller RS8GF202 © Danfoss 2015-08 AK-HP 780...

  • Page 103: Ak-Hp

    The in put in question has been put in manual control mode via the AK-ST 500 service tool software MAN DO……… The output in question has been put in manual control mode via the AK-ST 500 service tool software AK-HP 780 Heat pump controller RS8GF202 © Danfoss 2015-08...
  • Page 104 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 alternations can be made without subsequently changes being necessary in specifications already agreed.

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