NETZERO technical service manual 1. General information ▪ This manual contains the necessary information to install the heat pump. Read this manual carefully before installing the equipment. Keep this manual handy for future reference. This manual contains two different kinds of warnings that should be heeded. ▪...
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Refrigerant GEOSMART heat pumps may contain different types of refrigerant depending on the model. The refrigerants used by GEOSMART are not harmful to the environment as they do not contain chlorine and therefore do not contribute to the destruction of the ozone layer.
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▪ ollow the maintenance and service guidelines in this manual at all times. If in doubt, contact GEOSMART's technical department for assistance. ▪ he work area must be checked with a refrigerant detector, appropriate to each type of refrigerant, before and during any tasks that require the use of a flame or any other form of heat input to avoid creating explosive atmospheres.
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If the problem cannot be corrected immediately, but it is nonetheless necessary to continue with the operation, a suitable temporary solution, agreed with GEOSMART's technical department, must be used. This must be reported to the owner of the equipment so that all parties can be informed.
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NETZERO technical service manual ▪ he recovery equipment must be in good working order and a set of instructions for the equipment DANGER! must be to hand. It must be suitable for the recovery of all appropriate refrigerants, including, where applicable, flammable refrigerants.
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DANGER! ▪ he heat pump must be supplied with an external switch that can cut off all the circuits. GEOSMART recommends that an external switch be installed for each of the electrical power sources (control, internal auxiliary equipment and inverter).
The heat pump contains refrigerant. GEOSMART uses refrigerants that are not harmful to the environment, but once their useful life cycle is over, the refrigerant must be recovered so that it can be recycled or disposed of in accordance with current regulations.
Due to its heavy weight, the heat pump should be handled by two workers using a forklift for heavy NOTE loads. 2.2. Dimensions and connections The overall dimensions and hydraulic connections of the NETZERO CW and NETZERO BW heat pumps are described below. Brine / Cooling Heating / Heat dump Captación / Refrigeración Calefacción / Disipación de calor...
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NETZERO technical service manual Figure 2.2. Overall dimensions and hydraulic connections of the NETZERO CW model Description NETZERO09 NETZERO12 NETZERO22 Outlet towards space heating/cooling; Male 1-1/4” NPT 1-1/4” NPT 1-1/4” NPT Inlet from space heating/cooling; Male 1-1/4” NPT 1-1/4” NPT 1-1/4”...
NETZERO technical service manual Basic Compact inches inches 2,17 2,17 6,02 4,92 9,88 18,70 13,74 21,46 17,60 21,46 2,76 2,44 27,95 28,35 1058 41,65 1870 73,62 23,62 23,62 2,40 2,28 11,81 12,40 5,51 6,89 11,81 16,73 Table 2.2. Key to overall dimensions in mm. The factory installation is prepared for connection at the top.
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Disassemble the side covers. Loosen the screws located at the front and rear and on the top, and remove the cover. Once the covers have been removed, the acoustic insulation panels can be removed by pulling them outwards. Figure 2.5. Disassembly of the covers of NETZERO BW models ▪...
NETZERO technical service manual 2.5. Recommended positioning Choose a dry place where there is no risk of frost. Avoid installation against bedroom walls or walls of other rooms where noise emissions can be annoying. If possible, install the heat pump with the rear part pointed toward an exterior wall. Avoid installation near a corner, since this can amplify noise emission levels.
NETZERO technical service manual 2.6. Service areas To facilitate installation, start-up and maintenance work, the recommended minimum clearance distances around the heat pump are specified below. Figure 2.7. Minimum recommended service areas around the heat pump (amounts in mm) ▪ o not cover the ventilation ducts of the heat pumps, there may be a risk of components breaking DANGER! and causing injury and/or material damage.
NETZERO technical service manual 3. Hydraulic installation ▪ The installation schemes included from here on should be considered simply as a guide. ▪ The design of the hydraulic installation must be performed by qualified personnel and in accordance NOTE with applicable local regulations. ▪...
NETZERO technical service manual Aerothermal source systems with more than one AU unit must be connected in parallel, so the flow rate through each one is similar. The connection should use a reverse return or a collector. Hybrid source systems In hybrid source installations, the aerothermal collector and the geothermal collector must be connected in series so the antifreeze mixture circulates first through the aerothermal collector and then through the geothermal collector.
NETZERO technical service manual ▪ Use a working fluid with a freezing point of at least 10ºC below the minimum nominal working temperature of the equipment. ▪ Configure the equipment with a protection of at least 5ºC above the freezing temperature of the working fluid. 3.3.
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NETZERO technical service manual FBus2 AI12 Figure 3.3. Dual zone wiring scheme directly to the heating / cooling system FBus2 DI11 DI10 DI12 AI12 AI13 DO14 DO15 Figure 3.4. Wiring scheme directly to the heating / cooling system Installation using buffer storage tanks If required by the application, the heat pump can also be connected to the heating / cooling system using a buffer separator tank.
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NETZERO technical service manual DO13 DO13 FBus2 DI11 DI10 DI12 AI12 AI13 DO14 DO15 AI15 DO10 AI16 DO12 Figure 3.5. Wiring scheme using two buffer storage tanks FBus2 DI11 DI10 DI12 AI12 AI13 DO14 DO15 AI15 DO10 AI16 Figure 3.6. Wiring scheme using a single buffer storage tank Outlet units These make it possible to manage different outlet temperatures.
The NETZERO CW heat pumps are provided with an integrated inter storage tank with a capacity of 165 litres, so it does not require the installation of an external DHW storage tank. NETZERO BW Models The NETZERO BW heat pumps are designed to be used with external storage systems with a midway heat exchanger that can be either internal or external. DHW Recirculation This is used to control a DHW recirculation pump.
• In the NETZERO BW models, install a particulate filter in the return pipe to the heat pump with a mesh size no greater than 1 mm. It is recommended to install cut-off valves immediately before and after the filter to make it easier to clean or replace.
NETZERO technical service manual AI10 DO11 Figure 3.8. Pool production wiring schemes 3.6. Drain Condensation may occur one certain internal heat pump components during normal operation. On the other hand, antifreeze mixture or water may spill from the heat pump's internal safety valves due to eventual circuit overpressure. There is a drain connection at the rear of the heat pump to evacuate these liquids.
NETZERO technical service manual 4. Filling and discharge circuits ▪ uring filling work on the hydraulic circuits, take special care to prevent liquid from spilling on the DANGER! internal electrical heat pump components, which could cause personal injury due to electrocution and/or poor equipment operation.
NETZERO technical service manual Start the external recirculation pump and keep it running until the return is completely free of air and the antifreeze mixture is mixed perfectly. Open valve C and keep the external pump connected to remove the air between valves D and E. Close valve E and pressurise the circuit to target pressure.
NETZERO technical service manual 5. Electrical system ▪ efore performing any operation on the electrical panel, disconnect the power supply. DANGER! ▪ emember that the heat pump has more than one electrical power supply. ▪ EOSMART recommends that an external switch be installed for each of the electrical power sources (control, internal auxiliary equipment and inverter).
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(digital outputs DOxx) or regulation of pumps and/or valves (analogue outputs AOxx). The figure below shows a sample installation with the options for connecting external components to the heat pump. Figure 5.2. General scheme of the heat pump's electrical connections Example shown is an NETZERO BW model.
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NETZERO technical service manual Analog inputs (AIxx) These terminals are used to connect external temperature sensors. Only passive NTC temperature sensors can be connected, so cable connection polarity is not important. If necessary, use extension cables with a maximum length of 50 m and a minimum diameter of 0.75 mm .
5.2. Heat pump control power supply The GEOSMART heat pump requires two power supply points. One for the power supply of the control, including in this unit the power supply of the circulators and/or the internal and external valves and also the regulation signals, and the digital and analog...
NETZERO technical service manual inputs. This power supply should always be single-phase 1/N/PE 230 V / 50-60 Hz, and should be provided by an external 16 A switch that cuts off the electrical circuit. The recommended cable cross-section is AWG 14. Control Supply 230 Vac Figure 5.8.
NETZERO technical service manual ▪ NETZERO heat pumps comply with IEC 61000-3-12. The 3-phase heat pump always complies with the Ssc short-circuit rating whether it is greater than or equal to 1081 kVA at the interface point between NOTE the user's supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, in consultation with the operator of the distribution network if necessary, that the equipment is connected only to a Ssc short-circuit power supply greater than or equal to 1081 kVA.
NETZERO technical service manual Figure 5.11. Connection scheme of the external protection devices 5.6. Outside temperature sensor The outside temperature sensor, supplied with the heat pump, has to be installed for the heat pump to work properly. The NETZERO range is equipped with an NTC outdoor temperature sensor. When installing the sensor, bear the following indications in mind: ▪...
NETZERO technical service manual Description Signal Type Connector DG1 direct unit Digital output Activation 230Vac / 2A maximum Analog input NTC 10K 25 ºC sensor AI12 SG2 unit with mixture Analog output Valve regulation 0 – 10Vdc Digital output Activation 230Vac / 2A maximum Analog input NTC 10K 25 ºC sensor AI13...
NETZERO technical service manual 5.12. Alarm signal If the heat pump cannot start up the compressor because of an active alarm, the heat pump will generate an alarm signal. Description Signal Type Connector Alarm signal Relay digital output Activation 230Vac / 2A maximum Table 5.10.
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NETZERO technical service manual Relay thermostats Each outlet unit, from DG1 to SG4, has two 24Vac digital signals to activate heating or cooling demands from the interior thermostats or other external control devices. Description Signal Type Connector DG1 direct unit heating request Digital input 24Vac signal DG1 direct unit cooling request...
NETZERO technical service manual J29 FBUS2 PCOOEM J29 FBUS2 Figure 5.13. Example of connection of thT terminals Installation without interior terminals The NETZERO heat pumps can also be used in installations that do not have any type of interior terminal to generate request signals. In these cases, a continuous request can be imposed at the digital input of the unit to activate by selecting the appropriate control logic in the controller.
120 Ohm heater between Rx+/Tx+ and Rx-/Tx- in the first and last terminal to prevent possible communication problems. ▪ To install the device supplied by GEOSMART, follow the steps in the manufacturer's installation manual included with the equipment. It is necessary to configure a 100 address on the measurement device for proper communication with your...
NETZERO technical service manual 13 14 POWE LINK COMS kvarh 21 22 J29 FBUS2 PCOOEM J29 FBUS2 Figure 5.15. Example of connection of energy meter. 6. Start-up Check the following items before starting up the heat pump. Not doing so could result in poor heat pump operation and/or serious heat pump damage.
NETZERO technical service manual 7. Technical specifications NETZERO BW | NETZERO CW 7.1. Component location Description Description Production outlet Compressor suction temp. sensor Production inlet Compressor drain temp. sensor Source outlet Source outlet temp. sensor Source inlet Source inlet temp. sensor DHW inter-storage tank outlet Production outlet temp.
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NETZERO technical service manual NETZERO BW H B NETZERO BW P B 33 34 31 32 33 34 31 32 NETZERO BW R B NETZERO BW B B 33 34 31 32 33 34 31 32...
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NETZERO technical service manual NETZERO BW...
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NETZERO technical service manual NETZERO CW H B NETZERO CW P B 33 34 31 32 33 34 31 32...
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NETZERO technical service manual NETZERO CW R B NETZERO CW B B 33 34 31 32 33 34 31 32...
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NETZERO technical service manual NETZERO CW NETZERO BW/CW...
NETZERO technical service manual 7.3. NETZERO electrical connection tables ANALOG INPUTS CONNECTIONS DESCRIPTION Connection terminal Controller terminal Type Signal Block I / AI1 pCOOEM+ / J2 / U1 NTC 10K 25°C Compressor suction temperature Block I / AI2 pCOOEM+ / J2 / U2 Radiometer 0-5Vdc Compressor suction pressure Block I / AI3...
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NETZERO technical service manual DIGITAL OUTPUTS CONNECTIONS DESCRIPTION Connection Controller terminal Type Signal terminal Block III / DO1 pCOOEM+ / J16 / NO1-NC1 Activation 24Vac / 1A max Free cooling production Block III / DO2 pCOOEM+ / J27 / NO9-NC9 Activation 24Vac / 2A max Pool production Block III / DO3...
NETZERO technical service manual 8. Operation map NETZERO BW/CW -7; 65 35; 65 -25; 40 35; 10 -25; 10 Brine / cooling outlet temperature (°C) NETZERO BW/CW with AU 0; 65 50; 65 -18; 40 50; 10 -18; 10 Outdoor temperature (°C)
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NETZERO technical service manual NETZERO BW/CW with AU in cooling mode 10; 35 55; 35 55; 5 10; 5 Outdoor temperature (°C) The maximum compressor speed is not guaranteed over the entire compressor operating map. NOTE...
NETZERO technical service manual 10. Technical data table ▪ In the technical data tables you will find a series of numbers in superscript format, the meaning of which is explained below: NOTE Replacing or combining the geothermal collector with one or more NETZERO AU aerothermal units.
NETZERO technical service manual 11. Symbols DHW circuit 3-way valve open/closed Pool 3-way thermostatic valve Heating system 3-way modulating valve 0-10Vdc Cooling system Check valve NTC temperature sensor Cut-off valve Relay thermostat Safety valve Differential pressure valve Data bus communication terminal Circulator pump Particulate filter Direct outlet unit...
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800791 GEOSMART GEOTERMIA, S.L. Parque Empresarial Porto do Molle l Rúa das Pontes, 25 l 36350 – Nigrán – Pontevedra.- (Spain) Tel.: +34 986 262 184 http://www.GEOSMART.es NETZERO Gen5 TECHNICAL service manual Version 05.0G/2024 The manufacturer reserves the right to make any necessary changes to the contents of this manual without prior notice.
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