MULTIPURPOSE UNITS FOR 2|4-PIPE SYSTEMS - Technical manual

08 Storage tank with holes for integrative resistance | high static pressure pump | spare pump | system side P1 Low static pressure pump | the system side. P4 High static pressure pump | spare pump | system side 15,16 DHW SIDE HYDRONIC KIT 2. R1 Low static pressure pump | The hot water side. 1 System side heat exchanger 2 Hot water side heat exchanger 3 Source side heat exchanger AL Liquid tank CV One-way valve.

1 System side heat exchanger 2 DHW side heat exchanger 3 Source side heat exchanger AL Liquid storage tank CV One-way valve F Dehydrator filter. 1 System side heat exchanger 2 DHW side heat exchanger 3 Source side heat exchanger AL Liquid storage tank CV One-way valve.

HOT WATER PRODUCTION ONLY TO SYSTEM

SIMULTANEOUS HOT AND COLD WATER PRODUCTION TO SYSTEM

DESCRIPTION OF COMPONENTS 1. COOLING CIRCUIT

WATER FEATURES
STRUCTURE AND FANS
STANDARD HYDRAULIC CIRCUIT

COMPONENTS OF HYDRAULIC CIRCUIT IN CONFIGURABLE VERSIONS

SAFETY AND CONTROL COMPONENTS
ELECTRIC CONTROL AND POWER BOARDAND POWER BOARD

Equipped with a steel filtering net, the heat exchangers prevent both on the system side and the hot water/. Equipped with a pipe outlet, intervenes by discharging the excess pressure in case of abnormal pressure. MANUAL RESET HIGH PRESSURE SWITCH With fixed calibration, located on the high pressure side of the refrigeration circuit, prevents the operation of the compressor if abnormal working pressure occurs.

It is placed on the low pressure side of the refrigeration circuit and indicates the working pressure to the control board and generates an advance warning in case of abnormal pressure. Placed on the high pressure side of the cooling circuit, it indicates the working pressure to the control board and generates an advance warning in the event of abnormal pressure. It consists of an adjustment circuit board that varies the number of fan revolutions according to the condensing pressure read by the high pressure transducer, to keep it sufficiently high for correct unit functioning.

It also allows correct functioning in heating mode with external temperatures above 30°C and up to 42°C. This lever can be locked with one or more padlocks during maintenance interventions to prevent the machine from being switched on accidentally.

ACCESSORIES

MECHANICAL ACCESSORIES

ELECTRIC ACCESSORIES

TECHNICAL DATA

Aermec determines the sound power values in accordance with the EN ISO 9614-2 standard, in accordance with that required by the Eurovent certification. Sound pressure measured in free field conditions with a reflective surface (directivity factor Q=2) at a distance of 10 mt from the external surface of the unit, in accordance with EN ISO 3744 regulations.

OPERATIONAL LIMITS

COOLING MODE¹

HEATING MODE ¹

CORRECTIVE FACTORS FOR DATA DIFFERENT THAN NOMINAL IN COOLING MODE 1. YIELDS AND ABSORPTION DIFFERENT THAN NOMINAL

CORRECTIVE FACTORS FOR DATA DIFFERENT THAN NOMINAL IN HEATING MODE

CORRECTIVE COEFFICIENTS OF RECOVERED HEATING CAPACITY

IN FUNCTIONING MODE WITH DHW SIDE RECOVERY 2 PIPES | HOT WATER PRODUCTION SYSTEM SIDE 4 PIPES

HOT WATER PRODUCTION SYSTEM INSIDE 2 PIPES

USEFUL STATIC PRESSURES 2|4 PIPE SYSTEM

HIGH STATIC PRESSURE PUMPS IN COOLING MODE SYSTEM SIDE
LOW STATIC PRESSURE PUMPS DHW SIDE 2 PIPES | HEATING SIDE 4 PIPES
HIGH STATIC PRESSURE PUMPS DHW SIDE 2 PIPES | HEATING SIDE 4 PIPES kPa
HOW TO INTERPRET GLYCOL CURVES The curves shown in the diagram summarise The curves shown in the diagram summarise

Cooling capacity and power input correction factors take into account the presence of glycol and the change in evaporation temperatures. The corrected pressure drop factor takes into account the different flow rate resulting from applying the correct water flow rate to the factor. The water flow rate, factored in, is calculated to maintain the same Δt that would be present in the absence of glycol.

To determine the required percentage of glycol, see the diagram below; this percentage calculation may take into account one of the following factors. Depending on which fluid is considered (water or air), the graph is interpreted from the right or left side at the point of intersection of the curves with the external temperature line or the line produced by water. A point is obtained through which the vertical line will pass and this will distinguish both the percentage of glycol and the relative correction coefficients.

HOW TO INTERPRET THE GLYCOL CURVES The curves shown in the chart summarize The curves shown in the chart summarize The curves shown in the chart summarize a significant amount of data, each represented by a specific curve . To use these curves correctly, it is first necessary to make some initial reflections. If you want to calculate the percentage of glycol based on the outside air temperature, enter from the left axis and when you reach the curve, draw a vertical line, which in turn will intercept all other curves; the points obtained from the upper curves represent the coefficients for the correction of the cooling capacity and the input power, the flow rates and the pressure drops (remember that these coefficients must be multiplied by the nominal value of the relevant size op); while the recommended glycol percentage value to produce the desired water temperature is on the lower axis.

To calculate the percentage of glycol based on the produced water temperature, enter from the right axis and when you reach the curve, draw a vertical line that will intercept all the other curves; the points obtained on the above curves represent coefficients for the correction of cooling capacity and power input, flow rates and pressure drops (remember that these coefficients must be multiplied by the nominal value of the size in ques). on); while the lower axis recommends the value of the percentage of glycol required to produce water at the desired temperature.

ETHYLENE GLYCOL SOLUTIONS

EXPANSION VESSEL CALIBRATION

The standard preload pressure value for the expansion tank is 1.5 bar, while the volume is 24 liters. For example: if the level difference (H) is equal to 20 m, the calibration value of the vessel will be 2.3 bar. If the calibration value obtained from the formula is less than 1.5 bar (ie for H < 12.25), keep the calibration as standard.

EXPANSION VESSEL CALIBRATION

MINIMUM WATER CONTENT

PARTIALISATIONS

SOUND DATA

CALIBRATIONS OF SAFETY AND CONTROL PARAMETERS

GENERAL WARNINGS

PRESERVATION OF THE DOCUMENTATION The instructions along with all the related

INSTALLATION

WARRANTY

WARNINGS REGARDING SAFETY AND INSTALLATION STANDARDS INSTALLATION STANDARDS

PRODUCT IDENTIFICATION

ISO DIS 9614/2 intensimetric method

RECEIPT OF THE PRODUCT AND INSTALLATION 1. RECEIPT AND HANDLING

HANDLING THE MACHINE

LIFTING STANDARDS

SELECTION AND PLACE OF INSTALLATION

WEIGHT OF UNITS WHEN EMPTY

WEIGHT OF UNITS WHEN RUNNING

NRP0300 0330 0350
NRP 0500 0550 0600 0650
NRP 0700
NRP 0750
POSITION OF HYDRAULIC CONNECTIONS
BASIC 2 PIPE SYSTEM HYDRAULIC CIRCUITS

CIRCUITO IDRAULICO INTERNO ED ESTERNO AD NRP “°” standard

The unit is delivered mounted on a pallet; use sticks (not included) for moving with forklifts and straps. The unit is delivered mounted on a pallet; use sticks (not included) for moving with forklifts and straps. The unit is delivered packaged in estincoil; it must be lifted using suitable straps hooked to all installed eyebolts.

The selection and installation of components outside the PRK unit is the responsibility of the installer, who must operate according to the code of practice and in accordance with the Standard in force in the country of destination. The hydraulic connection pipes to the machine must be sized appropriately for the effective water flow rate required by the system when operating. The connecting pipe must be adequately supported so that its weight is not borne by the equipment.

A suitable charging/reintegration system should be provided, which is connected to the return line, together with a drain cock at the lowest part of the system.

NRP HYDRAULIC

COMPONENTS RECOMMENDED HYDRAULIC COMPONENTS EXTERNAL TO UNIT

INTERNAL AND EXTERNAL HYDRAULIC CIRCUIT TO NRP “01…08” with system storage tank only

Electrical conductivity Less than 200 mV/cm (25°C) Chloride ions Less than 50 ppm Sulfuric acid ions Less than 50 ppm Total iron Less than 0.3 ppm.

COMPONENTS RECOMMENDED HYDRAULIC COMPONENTS

BASIC 4 PIPE SYSTEM HYDRAULIC CIRCUITS

INTERNAL AND EXTERNAL HYDRAULIC CIRCUIT TO NRP “°” standard
INTERNAL AND EXTERNAL HYDRAULIC CIRCUIT TO NRP “01…08” with cooling system side storage tank only
INTERNAL AND EXTERNAL HYDRAULIC CIRCUIT TO NRP “P1…P4 R1…R4” with pumps on COOLING and HEATING sideCOOLING and HEATING side
LOADING SYSTEM
DISCHARGING SYSTEM

COLLEGAMENTI ELETTRICI

ELECTRIC DATA TABLE
PREPARATION FOR COMMISSIONING
START UP
MACHINE COMMISSIONING

ELECTRIC POWER CONNECTION TO THE ELECTRICAL MAINS
CONTROL AND COMMISSIONING

WITH THE MACHINE ON, CHECK COOLING CIRCUIT

FUNCTIONING FEATURES

SET POINT IN COOLING MODE
SET POINT IN HEATING MODE
COMPRESSOR START UP DELAY
CIRCULATION PUMPS NOT SUPPLIED
ANTI FREEZE ALARM
WATER FLOW RATE ALARM

SWITCH ON AND USE OF UNIT

MENU STRUCTURE

seconds have passed, it will no longer be possible to modify

10% of the nominal power supply voltage of the machine (in case of unbalanced three-phase unit max. 3% between phases). The use of an omnipolar magnetic switch is mandatory in accordance with the IEC-EN standards (contact opening of at least 3 mm), with appropriate interrupting power and differential protection based on the electrical data table shown below, installed as close to the appliance as possible. To get the functional connection of the device, take the power supply cable to the electrical control board inside the device and connect it to the terminals L1-L2-L3 and PE according to the polarities.

That the main power supply cables have a suitable cross-section which can support the total absorption of the unit. see electrical data sections) and that the unit is properly earthed. Use a tester to verify that the power supply voltage value on the RST phases is equal to 400V ±10%; also verify that the unbalance between phases is not greater than 3%. Verify that the compressor casing resistance is working by measuring the temperature rise of the oil pan.

The resistor/s must function for at least 12 hours before starting the compressor and in any case the temperature of the oil pan must be 10-15°C higher than room temperature. Ensure that the circulation pump/s is operating and that the water flow rate is sufficient to close the contact of the flow switch. Check the correct operation of the flow meters, if installed; when the cut-off valve at the outlet of the heat exchanger is closed, the unit should display the block.

Pressure line temperature If the subcooling and superheating values are regular, the temperature measured in the pressure line pipe at the outlet of the compressor should be 30/40°C above the condensing temperature. The anti-freeze control managed by the electronic regulation and the temperature probe located at the evaporator outlet is to prevent the formation of ice when the water flow rate is too low. To prevent the heat exchanger from breaking due to the freezing of the water it contains, foresee the blocking of the compressor (if the machine is below 3.5°C) and the ignition of the resistance (if in standby below 5°C).

If the temperature detected by the probe located at the outlet of the heat exchanger and at the inlet to the cooler is less than +3.8°C. The intervention of this alarm determines the compressor block and not the pump block, which remains active together with the ignition of the resistor if installed. The control panel of the NRP unit allows quick setting of machine operation parameters and their display.

MENU STRUCTURE

ACCESSORY CONNECTIONS