Riello NXHM Installation And Owner's Manual
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Riello NXHM Installation And Owner's Manual

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NXHM
IT
MANUALE D'INSTALLAZIONE E USO
EN
INSTALLATION AND OWNER'S MANUAL

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  • Page 1 NXHM MANUALE D’INSTALLAZIONE E USO INSTALLATION AND OWNER’S MANUAL...
  • Page 2 Gamma/Range Codice Descrizione Riello Potenza Code Riello description Power size 20194140 NXHM 018T 18kW 20194141 NXHM 022T 22kW 20194142 NXHM 026T 26kW 20194143 NXHM 030T 30kW...
  • Page 3 SAFETY PRECAUTIONS declaration of conformity of the product can be consulted and downloaded from the site. GENERAL INTRODUCTION Refer to the instructions on the back cover of the ma- ACCESSORIES nual. Accessories supplied with the unit Accessories avaliable from supplier BEFORE INSTALLATION IMPORTANT INFORMATION FOR THE REFRIGERANT...

  • Page 4: Wiring Diagram

    Wiring diagram Electric Control System Terminal Block Hydraulic System Refrigerant System NOTE Pictures in this manual are for reference only, please refer to the actual product. NOTE - Maximum length of communication wirings between the indoor unit and the controller is 50m. - Power cords and communication wiring must be laid out separately, they can not be placed in the same conduit.

  • Page 5: Safety Precautions

    Model Serial N° REFRIGERANT Code EQUIVALENT HIGH EXCESSIVE OPERATING Year of construction: PRESSURE MAXIMUM ALLOWABLE PRESSURE OUTDOOR RESISTANCE CLASS year of construction Hermetically sealed equipment contains fluorinated greenhouse gases RIELLO S.p.A. Via Ing. Pilade Riello, 7 37045 - Legnago (Vr)
  • Page 6 Explanation of abbreviations used Abbreviations Total water outlet temperature of hydraulic module (after electrical heating outlet or gas boiler outlet) Water outlet setting temperature (Single zone installation) Zone 1 outlet water setting temperature (Dual-zone installation) T1S2 Zone 2 outlet water setting temperature (Dual-zone installation) Hydraulic module refrigerant liquid side temperature Hydraulic module refrigerant gas side temperature Tank temperature...
  • Page 7 Do not touch the internal parts during and immediately after operation. Touching the internal parts can cause burns. To avoid injury, give the internal parts time to return to normal temperature or, if you must touch them, be sure to wear protective gloves. CAUTION Ground the unit.

  • Page 8: General Introduction

    2 GENERAL INTRODUCTION These units are used for both heating and cooling applications and domestic hot water tanks.They can be combined with fan coil supplied. A wired controller is supplied with the unit. the installation place). Operation range. COOLING MODE Capacity/Load Outdoor temperature(°C) Tbivalent...

  • Page 9: Accessories Supplied With The Unit

    3 ACCESSORIES CAUTION 3.1 Accessories supplied with the unit unit. Do not use the grips in the fan grills to avoid damage. Name Shape Quantity The unit is top heavy! Prevent the unit from falling due to impro- per inclination during handling. Installation and owner’s manual (this book) The hook and barycenter...

  • Page 10: Installation Site

    5 IMPORTANT INFORMATION Do not climb, sit or stand on top of the unit. FOR THE REFRIGERANT rant leakage according to relevant local laws and regulations. Don’t install the unit near the sea or where there is corrosion gas. air. Refrigerant type: R32; Volume of GWP: 675. When installing the unit in a place exposed to strong wind, pay GWP=Global Warming Potential special attention to the following.

  • Page 11: Selecting A Location In Cold Climates

    Prepare a water drainage channel around the foundation, to drain waste water from around the unit. If water does not easily drain from the unit, mount the unit on a foundation of concrete blocks, etc. (the height of the foundation should be about 100 mm.
  • Page 12 (unit: mm) 10 Expansion bolt Rubber shocking proof mat Solid ground Concrete basement or roofing h 100mm 7.3 Drain hole position Drain hole NOTE It's necessary to install an electrical heating belt if water can't drain out in cold weather. 7.4 Servicing space requirements 1) Single unit installation.

  • Page 13: Typical Applications

    8 TYPICAL APPLICATIONS The application examples given below are for illustration only. 8.1 Application 1 Space heating with a room thermostat connected to the unit ---- FHL1 FHL2 ---- FHLn Code Assembly unit Outdoor unit Manometer Pressure relief valve Expansion vessel Air purge valve Plate heat exchanger Drain valve...

  • Page 14: Space Heating

    8.2 Application 2 Space heating without room thermostat connected to the unit. Domestic hot water tank is connected to the unit, and the tank is with solar heating system. 12.1 12.1 12.3 12.2 ---- FHL1 FHL2 ---- FHLn Code Assembly unit Outdoor unit PUMP_O Manometer...
  • Page 15 8.3 Application 3 Space cooling and heating application with a room thermostat suitable for heating/cooling changeover when connected to the unit. water is provided through the domestic hot water tank which is connected to the unit. 12.1 12.1 12.3 12.2 ---- FCU1 FCU2 ----...
  • Page 16 8.4 Application 4 Space heating with an auxiliary boiler (alternating operation). Space heating application by either the unit or by an auxiliary boiler connected in the system. The unit controlled contact (also called "permission signal for the auxiliary boiler") is determined by the outdoor temperature (thermistor Bivalent operation is possible for both space heating operation and domestic water heating operation.

  • Page 17: Operation

    8.4.3 Application C 12.1 12.3 12.2 ---- ---- FHL1 FHL2 FHLn Code Assembly unit Outdoor unit Domestic hot water tank Manometer 12.1 Air purge valve Pressure relief valve 12.2 Heat exchanger coil Expansion vessel 12.3 Booster heater Plate heat exchanger T5: DHW tank temp.
  • Page 18 8.5 Application 5 Dual setpoint function application with two room thermostat connect to the outdoor unit. NOTE FCU1 FCU2 FCUn 23.1 23.2 FHL1 FHL2 FHLn Code Assembly unit Outdoor unit Manometer Air purge valve Pressure relief valve Drain valve Expansion vessel Plate heat exchanger PUMP_O Air purge valve...
  • Page 19 NOTE STAT. It is the installers’ responsibility to ensure that no unwanted situations can occur (e.g. extremely high temperature water going towards ted heating in zone B. When only zone B requests heating, the mixing station will be fed with water at a temperature equal to the second set point.Depending station.
  • Page 20 8.7 Application 7 The units are installed in parallel and can be used for cooling, heating and hot water. 6 units can be connected in parallel. Please refer to 9.7.5 for the parallel system electrical control system connection diagram. The parallel system can control and view the operation of the entire system only by connecting the master to the wire controller. If the DHW function is required, the water tank can only be connected to the master unit water circuit through a three-way valve, and controlled by the master unit.

  • Page 21: Overview Of The Unit

    9 OVERVIEW OF THE UNIT 9.1 Disassembling the unit Door 1 To access to the compressor, electrical parts and hydraulic compartment WARNING Parts inside the unit may be hot. Push the grill to the left until it stops, then pull its right edge, so you can removed the grill. You can also reverse the procedure. Be careful to avoid hand injury.

  • Page 22: Electronic Control Box

    Code Assembly unit Explanation Air purge valve Remaining air in the water circuit will be automatically re-moves air from the water circuit Expansion vessel Balances water system pressure (expansion vessel volume: 8l) Circulation pump Circulates water in the water circuit Prevents excessive water pressure by opening at 3 bar and discharging water from the water Pressure relief valve circuit...
  • Page 23 9.3.1 Main control board of hydraulic module CN24 CN21 CN28 CN16 CN32 CN13 CN15 CN29 CN18 CN25 CN42 CN40 DIS1 CN31 CN41 CN22 CN35 CN36 CN17 CN11 CN30 Order Port Code Assembly unit CN21 Power Port for power supply Rotary dip switch DIS1 Digital display Port for ground...

  • Page 24: Inverter Module

    1 2 3 4 5 Port for communication with the wired controller CN30 Communicate port between indoor unit and outdoor unit 9 10 Port for internal machine cascade 25 29 Port for antifreeze E-heating tape (external) 27 28 Port for additional heat source Input port for solar energy 3 4 15 Port for room thermostat...

  • Page 25: Filter Board

    9.3.3 Main control board of unit Code Assembly unit Power supply port for PCB B (CN41) Port for IC programming (CN11) CN41 CN26 CN24 Port for pressure sensor (CN6) Port for suction temp.sensor (CN5) CN36 CN21 Port for discharge temp.sensor (CN8) Port for outdoor ambient temp.

  • Page 26: Water Piping

    9.4 Water piping All piping lengths and distances have been taken into consideration. Requirements The maximum allowed thermistor cable length is 20m. This is the maximum allowable distance between the domestic hot water tank and the unit (only for installations with a domestic hot water tank).The thermistor cable supplied with the domestic hot water tank is 10m in length.In NOTE NOTE If water is not removed from the system in freezing weather when unit is not used, the frozen water may damage the water circle parts.
  • Page 27 Before continuing installation of the unit, check the following: always use materials that are compatible with the water used in the system and with the materials used in the unit drain taps must be provided at all low points of the system to permit complete drainage of the circuit during maintenance air vents must be provided at all high points of the system.

  • Page 28: Water Circuit Connection

    Example 1 The unit is installed 5m below the highest point in the water circuit. The total water volume in the water circuit is 100l. In this example, no action or adjustment is required. Example 2 The unit is installed at the highest point in the water circuit. The total water volume in the water circuit is 250l. Result: Since 250l is more than 230l, the pre-pressure must be decreased (see table above).
  • Page 29 1. Freeze protection by glycol About freeze protection by glycol Adding glycol to the water lowers the freezing point of water. WARNING Ethylene glycol is toxic. WARNING accelerated by the presence of copper and high temperatures. The acidic uninhibited glycol attacks metal surfaces and forms galvanic corrosion cells that cause severe damage to the system.

  • Page 30: Filling Water

    NOTE removed and dried, then can be reinstalled in the unit. keep dry 9.5 Filling water Connect Make sure the automatic air purge valve is open (at least 2 turns). Fill with water pressure of approximately 2.0 bar. Remove air in the circuit as much as possible using the air purge valves. Air in the water circuit could lead to malfunction of the backup electric heater.

  • Page 31: Precautions On Electrical Wiring Work

    9.7.1 Precautions on electrical wiring work Fix cables so that cables do not make contact with the pipes (especially on the high pressure side). high-pressure side. Make sure no external pressure is applied to the terminal connectors. When installing the ground fault circuit interrupter make sure that it is compatible with the inverter (resistant to high frequency electrical noise) to avoid unnecessary opening of the ground fault circuit interrupter.

  • Page 32: Field Wiring Guidelines

    NOTE Please use H07RN-F for the power wire, all the cable are connect to high voltage except for thermistor cable and cable for user interface. Equipment must be grounded. All high-voltage external load, if it is metal or a grounded port, must be grounded. All external load current is needed less than 0.2A, if the single load current is greater than 0.2A, the load must be controlled through AC contactor.
  • Page 33 9.7.5 Connection for cascade system Please use the shielded wire, and the shield layer must be grounded. L1 L2 L3 N L1 L2 L3 N L1 L2 L3 N L1 L2 L3 N ..Slave unit 1 Slave unit 2 Slave unit x Only the last IDU requires adding the...
  • Page 34 Port provide the control signal to the load.Two kind of control signal port: Type 1: Dry contact without voltage. Type 2: Port provide the signal with 220V voltage. If the current of load is <0.2A, load can connect to the port directly. Power supply Type 1: Type 2:...

  • Page 35: Double Zone

    Room thermostat type2 (RT2) (Low voltage): “POWER IN” provide the working voltage to the RT. TO CONTROL PCB HEAT COOL POWER SUPPLY 3-phase There are three methods for connecting the thermostat cable (as described in the picture above) and it depends on the application. Method A RT can control heating and cooling individually, like the controller for 4-pipe FCU.
  • Page 36 9 21 11 23 P_o N P_s N P_d N PUMP_c PUMP_d PUMP_o PUMP_s CONTROL SIGNAL CONTROL SIGNAL CONTROL SIGNAL CONTROL SIGNAL OUTPUT OUTPUT OUTPUT OUTPUT (For zone 1 pump or (For zone 2 pump) (For solar pump) (For DHW tank outside circulating pump) circulating pump) Voltage...
  • Page 37 9. For additional heat source control Voltage 220-240VAC Maximum running current (A) AHS1 AHS2 Wiring size (mm²) 0,75 Control port signal type Type 2 ADDITIONAL HEAT SOURCE CONTROL SIGNAL OUTPUT 10. For defrosting signal output Voltage 220-240VAC Maximum running current (A) DFT2 DFT2 Wiring size (mm²) 0,75...

  • Page 38: Start-Up And Configuration

    a. For room thermostat (Low voltage): see 9.7.6 2) for room thermostat b. For smart grid: The unit has smart grid function, there are two ports on PCB to connect SG signal and EVU signal as following: 1. When EVU signal is on , and SG signal is on, as long as the DHW mode is set to be valid, heat pump will operate DHW mode priority and the 10 START-UP AND CONFIGURATION by the installer to match the installation environment (outdoor climate, installed options, etc.) and user expertise.

  • Page 39: Setting The Pump Speed

    After the installation of the unit, check the following before switching on the circuit breaker: thermostat (when applicable), unit and domestic hot water tank, and unit and backup heater kit have been connected according to the instructions described in the chapter 9.7 "Field wiring", according to the wiring diagrams and to local laws and regulations. Fuses, circuit breakers, or protection devices Check that the fuses or the locally installed protection devices are of the size and type Backup heater circuit breaker: Do not forget to turn on the backup heater circuit breaker in the switchbox (it depends on the backup heater type).

  • Page 40: Field Settings

    1. Faults with external interference sources Faults Causes Remedy Electrical fuse defective Check fuses Pump is not running although the power supply is switched on. Black display Pump has no voltage Restore power after interruption Increase the system suction pressure within the permissible range Pump is making noises Check the delivery head setting and set to lower...

  • Page 41: How To Go To For Serviceman

    Keys Function Go to the menu structure (on the home page) Navigate the cursor on the display Navigate in the menu structure Adjust settings Come back to the up level Go to the next step when programming a schedule in the menu structure; and 10.5.1 DHW MODE SETTING About "FOR SERVICEMAN"...

  • Page 42: Cool Mode Setting

    10.5.2 COOL MODE SETTING How to enter the TEMP. TYPE SETTING Go to " "> FOR SERVICEMAN> 5.TEMP. TYPE SETTING. Go to " "> FOR SERVICEMAN> 2.COOL MODE SETTING. Press " ". The following page will be displayed: Press " ".

  • Page 43: Room Thermostat

    10.5.6 ROOM THERMOSTAT of the phone number is 13 digits, if the length of phone number is short About ROOM THERMOSTAT. The ROOM THERMOSTAT is used to set whether the room thermostat is available. 9 SERVICE CALL How to set the ROOM THERMOSTAT. PHONE NO.
  • Page 44 If YES is selected, the following pages will be displayed. Circulation pump running is turned on, all running components will stop. 60 seconds later, the SV1 will open, the SV2 will close, 60 se- conds later PUMP_I 11 TEST RUN PUMP_I will operate for 3min, after the pump stops 60 11.1 POINT CHECK seconds, the SV1 will close and the SV2 will open.

  • Page 45: Special Function

    10.5.12 SPECIAL FUNCTION The following page will be displayed: When it is in special function modes,the wired controller can not ope- 12.1 PREHEATING FOR FLOOR rate, the page do not return to the homepage, and the screen showed Do you want to turn off the preheating the page that specical function runs, the wired controller do not locked.

  • Page 46: Auto Restart

    the picture below: 15 INPUT DEFINE 15.1 M1M2 REMOTE 15.2 SMART GRID 15.3 Tw2 T_DRYPEAK 15.4 Tbt1 15.5 Tbt2 15 INPUT DEFINE 15.6 Ta 15.7 Ta-adj -2°C t_DRYUP t_HIGHPEAK t_DRYD 15.8 INPUT SOL. 10.5.13 AUTO RESTART ＜10m 15.9 LF-PIPE LENGTH The AUTO RESTART function is used to select whether the unit reap- 15.10 RT/Ta_PCB plies the user interface settings at the time when power returns after a...

  • Page 47: Setting Parameters

    10.5.18 SETTING PARAMETERS The parameters related to this chapter are shown in the table below. Order Setting Code State Default Min. Max. Unit number interval DHW MODE Enable or disable the DHW mode: 0=NON,1=YES DISINFECT Enable or disable the disinfect mode: 0=NON,1=YES DHW PRIORITY Enable or disable the DHW priority mode: 0=NON,1=YES PUMP_D...
  • Page 48 Order Setting Code State Default Min. Max. Unit number interval T4_AHS_ON The ambient temperature for starting the additional heating source °C IBH_LOCATE IBH/AHS installation location PIPE LOOP=0; BUFFER TANK=1 °C P_IBH1 Power input of IBH1 P_IBH2 Power input of IBH2 7.10 P_TBH Power input of TBH...

  • Page 49: Maintenance And Service

    11 TEST RUN AND FINAL Backup heater (if present) vessel insulation cover Check that the backup heater insulation cover is fastened tightly CHECKS around the backup heater vessel. Applies only to installations with a domestic hot water tank. The installer is obliged to verify correct operation of unit after installation. Check for correct operation of the pressure relief valve on the 11.1 Final checks domestic hot water tank.

  • Page 50: General Symptoms

    13.2 General symptoms Symptom 1: The unit is turned on but the unit is not heating or cooling as expected POSSIBLE CAUSES CORRECTIVE ACTION Check the parameters.T4HMAX,T4HMIN in heat mode. The temperature setting is not correct T4CMAX,T4CMIN in cool mode. T4DHWMAX,T4DHWMIN in DHW mode. •...
  • Page 51 Symptom 7: Heat mode can’t change to DHW mode immediately POSSIBLE CAUSES CORRECTIVE ACTION • Set "dT1S5" to maximum value, and set "t_DHWHP_RESTRICT" to minimum valve. • Set "dT1SH" to 2°C. Volume of tank is too small and the location of water temperatu- •...

  • Page 52: Operation Parameters

    13.3 Operation parameters This menu is for installer or service engineer reviewing the operation parameters. At home page, go to ''MENU''>''OPERATION PARAMETER''. "#00" to "#01", "#02" etc. accordingly. OPERATION PARAMETER OPERATION PARAMETER OPERATION PARAMETER GAS BOILER ONLINE UNITS NUMBER PUMP_O T1 LEAVING WATER TEMP.

  • Page 53: Error Codes

    13.4 Error codes When a safety device is activated, an error code will be displayed on the user interface. A list of all errors and corrective actions can be found in the table below. Reset the safety by turning the unit OFF and back ON. In case this procedure for resetting the safety is not successfull, contact your local dealer.
  • Page 54 1. Check the resistance of the sensor. 2. The Tp sensor connector is loosen. Reconnect it. Compressor discharge temperature 3. The Tp sensor connector is wet or there is water in. remove the water, make the sensor (Tp) fault connector dry. Add waterproof adhesive. 4.
  • Page 55 1. Check the resistance of the sensor. 2. The T2B sensor connector is loosen. Reconnect it. 3. The T2B sensor connector is wet or there is water in. remove the water, make Refrigerant gas temp. sensor (T2B) fault the connector dry. Add waterproof adhesive. 4.
  • Page 56 Heating mode, DHW mode: Release the air. 2. Water pressure is lower than 0.1Mpa, charge the water to let the pressure in the range of 0.15~0.2Mpa. 3. Over charge the refrigerant volume. Recharge the refrigerant in right volume. 4. Electrical expansion valve locked or winding connector is loosen. Tap-tap the valve High pressure protection working correctly and install the winding in the right location DHW mode: Water tank heat exchanger is smaller than the required.

  • Page 57: Technical Specifications

    DC compressor inverter module fault DC bus low voltage protection (from in- verter module mostly when compressor running) DC bus high voltage protection from DC 1. Check the Heat pump system pressure. driver 2. Check the phase resistance of compressor. 3.

  • Page 58: Technical Data

    14.2 Technical data Unit 18kW 22kW 26kW 30kW Performance in heating [A7/W35] (1) Nominal capacity 18,00 22,00 26,00 30,10 4,70 4,40 4,08 3,91 SCOP 4,60 4,53 4,50 4,19 A+++ A+++ A+++ Performance in heating [A7/W45] (2) Nominal capacity 18,00 22,00 26,00 30,00 3,50...
  • Page 59 14.3 Performance based on the climatic zone Unit 18kW 22kW 26kW 30kW Average zone - Average temperature [47/55°C] SCOP 3,21 3,22 3,14 3,14 Pdesign -7°C 15,64 19,84 20,65 20,12 Pdesign +2°C 9,62 11,91 14,28 16,50 Pdesign +7°C 6,40 7,99 9,30 10,51 Pdesign +12°C 3,60...

  • Page 60: Information Servicing

    15 INFORMATION SERVICING Checks to the area For repair to the refrigerating system, the following precautions shall be complied with prior to conducting work on the system. Work procedure is being performed. General work area Checking for presence of refrigerant The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially adequately sealed or intrinsically safe.
  • Page 61 12) Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch 14) Leak detection methods be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant.
  • Page 62 When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct numbers of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant(i.e special cylinders for the recovery of refrigerant). Cylinders shall be complete Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
  • Page 63 ANNEX A: Refrigerant cycle Cooling Heating Item Description Item Description Compressor Refrigerant inlet (liquid pipe) temp. sensor 4-Way Valve Refrigerant outlet (gas pipe) temp. sensor Gas-liquid separator Water outlet temp. sensor Air side heat exchanger Water Inlet temp. sensor Electronic expansion Valve Air purge valve Single-way electromagnetic valve Expansion vessel...

  • Page 64: Electrical Diagram

    Electrical diagram To the heating tape FERRITE CORE of drainage outlet (<200mA) NERO FERRITE CORE CODE NAME BLACK BLUE NERO NERO INVERTER COMPRESSOR DRIVER BOARD BLACK BLUE WHITE BLACK FERRITE CORE FERRITE CORE FERRITE CORE FERRITE CORE BLACK BLACK BLACK FERRITE CORE PUMP FLOWSWITCH...
  • Page 66 RIELLO S.p.A. Via Ing. Pilade Riello, 7 37045 - Legnago (VR) www.riello.it Poiché l’Azienda è costantemente impegnata nel continuo perfezionamento di tutta la sua produzione, le caratteristiche estetiche e dimensionali, i dati tecnici, gli equipaggiamenti e gli accessori, possono essere soggetti a variazione.

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