S735 - Heat pump Nibe - Free user manual and instructions

USER MANUAL S735 Nibe

UK: 0.6 (6.0 bar) Compressor and additional heat Do not start S735 if there is a risk that the water in the system has frozen. Water may drip from the safety valve. A factory-fitted overflow pipe runs from the safety valve to an overflow cup. An over- flow pipe has to be routed from the over- flow cup to a suitable drain. The entire length of this overflow pipe is inclined to prevent water pockets, and it must also be frost-proof.

English The safety valves must be actuated regu- larly to remove dirt and to check that they are not blocked. Electrical installation and wiring must be carried out in accordance with national provisions. S735 must be installed via an isolator switch. The cable area has to be dimen- sioned based on the fuse rating used. S735 is equipped with electrically powered safety measures. To be effective, S735 must be electrically powered at all times after installation, other than when servi- cing. If the supply cable is damaged, only NIBE, its service representative or similar author- ised person may replace it to prevent any danger and damage. General

NIBE hereby declares that this type of radio equipment F0001-X-XXX, F0002-X-XXX conforms with Directive 2014/53/EU. The full text of the EU Declaration of Conform- ity can be found at nibe.eu. UKCA NIBE hereby declares that this type of radio equipment F0001-X-XXX, F0002-X-XXX conforms with Directive The Radio Equipment Regulations 2017. The full text of the UKCA Declaration of Conformity can be found at nibe.co.uk. Recovery Leave the disposal of the packaging to the installer who installed the product or to special waste sta- tions. Do not dispose of used products with normal household waste. It must be disposed of at a special waste station or dealer who provides this type of service. Improper disposal of the product by the user results in ad- ministrative penalties in accordance with current legislation. Open source code This product contains software covered by an open source code licence. For more information as well as access to the source code, visit opensource.nibe.eu.Handling The heat pump contains highly flammable refrigerant. Special care should be exer- cised during handling, installation, service, cleaning and scrapping to prevent damage to the refrigerant system and thus reduce the risk of leakage. NOTE Work on refrigerant systems must be carried out by personnel who have knowledge and experience of working with flammable refrigerants. Safety precautions WARNING! Do not use agents to speed up the defrosting process or for cleaning, other than those recommended by the manufacturer. The apparatus must be stored in a room with no continuous ignition sources (e.g. naked flame, an active gas installation or an active electric heater). Must not be punctured or burned. Be aware that the refrigerant may be odourless GENERAL Pipe installation should be kept to a minim- um. AREA CHECKS Before work is started on systems that contains combustible refrigerants, safety checks must be performed to ensure that the ignition risk is kept to a minimum. WORKING METHOD The work must be carried out in a controlled way to minimise the risk of contact with combustible gas or liquid during the work.

GENERAL FOR THE WORKING RANGE

All maintenance staff and those who work in close proximity to the product must be instructed which type of work is to be car- ried out. Avoid carrying out work in en- closed spaces. The area surrounding the worksite must be cordoned off. Ensure that the area is made safe by removing combust- ible material.

CHECK FOR THE PRESENCE OF

REFRIGERANT Check whether there is refrigerant in the area using a suitable refrigerant detector prior to and during work, to notify the ser- vice technician whether there is a possible flammable atmosphere or not. Ensure that the refrigerant detector is suitable for combustible refrigerant, i.e. does not gener- ate sparks or cause ignition in any other way.

PRESENCE OF FIRE EXTINGUISHERS

If hot work is carried out on the heat pump, a powder or carbon dioxide fire extinguisher must be to hand.

ABSENCE OF IGNITION SOURCES

Pipes connected to the unit must not con- tain potential sources of ignition. Those who carry out work with refrigerant system connections, including exposing pipes that contain or have contained com- bustible refrigerant, may not use potential ignition sources in such a way that that can lead to risks of fire or explosions. All potential ignition sources, including ci- garette smoking, should be kept at a safe distance from the service work area where combustible refrigerant can leak out. Before carrying out work, the area surrounding the equipment must be checked to ensure that there are no ignition risks. "No smoking" signs must be displayed. VENTILATED AREA Ensure that the work is carried out outdoors or that the work area is ventilated before the system is opened and before any hot work is carried out. The area must be vent- ilated whilst the work is being carried out. There must be ventilation around any refri- gerant that comes out, which should be routed outdoors.

NIBE S735 | EN10CHECKING COOLING EQUIPMENT

If electrical components are replaced, the replacement parts must be fit for purpose and have the correct technical specifica- tions. Always follow the manufacturer's guidelines regarding maintenance and ser- vicing. Contact the manufacturer's technic- al department in the event of any doubts. The following checks must be carried out for installations that use combustible refri- gerants.

The actual filling quantity is appropriate for the magnitude of the space where the parts containing refrigerant are installed.

Ventilation equipment and outlet work correctly and without obstructions.

All markings of equipment are visible and clear. Markings, signs and similar that are not clear must be replaced.

Refrigerant pipes and components are positioned in such a way that it is not likely that they be subjected to sub- stances that can corrode components containing refrigerant, if these compon- ents are not made of material that is res- istant against corrosion, or not appropri- ately protected against such corrosion.

CHECKING ELECTRICAL EQUIPMENT

Repair and maintenance of electrical com- ponents must include initial safety checks and procedures for component inspection. In the event of a fault, which can cause a safety risk, do not supply any power to the circuit until the fault has been rectified. If the fault cannot be rectified immediately, and operation must continue, an adequate temporary solution must be implemented. This must be reported to the equipment owner, so that all parties have been in- formed. The following checks must be carried out at the initial safety checks.

That the capacitors are discharged. Dis- charging must be done safely, to prevent the risk of sparking.

That no powered electrical components or live cables are exposed when filling or collecting refrigerant or when the system is flushed.

That the system is continually earthed.

REPAIRING SEALED COMPONENTS

When repairing sealed components, all electrical supply must be disconnected from the equipment that is being repaired before any sealed covers or similar are re- moved. If it is absolutely necessary to have an electricity supply to the equipment dur- ing the service, continuously activated leak tracing must be performed at the most critical points in order to warn of any dan- gerous situations. Pay particular attention to the following so that the sheath is not changed in a way that affects the protection level when working with electrical components. This means damage to cables, unnecessary amounts of connections, terminals that do not follow the original specifications, damaged gas- kets, incorrect grommets etc. Ensure that the apparatus is secured properly. Check that seals or sealing materials have not deteriorated to a degree that they can no longer prevent combustible gases from entering. Replacement parts must meet the manufacturer's specifications. NOTE Use of silicone seals can hamper the efficiency of certain types of leak- tracing equipment. Components with built in safety do not need to be isolated before starting work. WIRING Check that cabling will not be subject to wear, corrosion, excessive pressure, vibra- tion, sharp edges or any other adverse en- vironmental effects. The check shall also 11NIBE S735 | ENtake into account the effects of aging or continual vibration from sources such as compressors or fans. LEAK TESTING The following leak detection methods are deemed acceptable for systems containing flammable refrigerants. Electronic leak tracers must be used to de- tect combustible refrigerant; but the leak tracer may not be sufficiently sensitive or may need to be recalibrated (the leak tra- cing equipment must be calibrated in an area completely free from refrigerant). The leak tracer must not be a potential source of ignition and must be suitable for the rel- evant refrigerant. The leak tracing equip- ment must be set and calibrated for the relevant refrigerant, to ensure that the gas concentration is a maximum of 25% of the lowest combustible concentration (Lower Flammability Limit, LFL) of the relevant re- frigerant. Leak detection fluids are suitable for use with most refrigerants but the use of deter- gents containing chlorine shall be avoided as the chlorine may react with the refriger- ant and corrode the copper pipe-work. If a leak is suspected, all naked flames shall be removed/extinguished. If a leak that requires brazing is detected, all refrigerant must be removed from the system and stored in a separate container. Alternatively, the refrigerant can be stored separated from the brazing area in a part of the system at a safe distance from the leak, if this part of the system can be dis- connected safely with shut-off valves. The system must be emptied in accordance with the section “Removal and draining”.

REMOVAL AND DRAINING

When a cooling circuit is opened for repairs – or for another reason– work must be car- ried out in a conventional manner. Due to the risk of fire it is important that best practice is applied. Follow the procedure below.

Flush the circuit with inert gas.

Flush through with inert gas.

Open the circuit by cutting or brazing. Collect the refrigerant in the intended cyl- inders. Clean the system with oxygen-free nitrogen to make the unit safe. This process may need to be repeated several times. Compressed air and oxygen must not be used. Clean the system by breaking the vacuum with oxygen-free nitrogen, and filling the system to working pressure, relieving the pressure to atmospheric pressure and fi- nally pumping to vacuum. Repeat the pro- cess until no refrigerant remains in the system. After the final filling with oxygen- free nitrogen, relieve the pressure in the system to atmospheric pressure, so that work can be carried out. This type of flush- ing must always be carried out if hot work is to be performed on the pipe system. Ensure that the vacuum pump’s outlet is not near to any potential ignition sources and that there is satisfactory ventilation by the outlet. FILLING In addition to the conventional filling pro- cedures, the following actions must be taken.

Ensure that different refrigerants are not mixed when filling equipment is used. Hoses and lines must be as short as pos- sible to minimise the enclosed refrigerant volume.

Containers must be stored in a suitable position in accordance with the instruc- tions.

Ensure that the cooling system is groun- ded before the system is filled with refri- gerant.

Mark the system once filling is complete (if not already marked). If the amount dif- fers from the pre-installed amount, the NIBE S735 | EN12marking must include the pre-installed amount, the added extra amount and the total amount.

Take extra care not to overfill the cooling system. Before refilling the system, pressure test it with oxygen-free nitrogen. Leak test the system after filling but before using the system. Perform an additional leak test be- fore leaving the installation. DECOMMISSIONING Before the device is taken out of operation, the technician must without exception be very familiar with the equipment and all its component parts. Good practice prescribes that all refrigerant is collected safely. Be- fore the collected refrigerant can be reused, oil and refrigerant samples must be taken, if analysis is required. There must be a power supply when this task is started.

Familiarise yourself with the equipment and its use.

Isolate the system electrically.

Before starting the procedure, ensure that:

necessary equipment for mechanical handling of the refrigerant container is available

the collection process is continuously supervised by an authorised person

the collection equipment and contain- ers meet appropriate standards.

Pump the refrigerant system to vacuum, if possible.

If it is not possible to pump to vacuum, manufacture a branch, so that the refri- gerant can be retrieved from different parts of the system.

Check that the refrigerant container is on the scales before starting to collect.

Start the collection device and collect according to the manufacturer's instruc- tions.

Do not exceed the containers' maximum permitted working pressure – not even temporarily.

When the containers have been filled correctly and the process is complete, close all shut-off valves in the equip- ment and remove and containers and equipment from the installation immedi- ately.

The collected refrigerant must not be filled in any other system before being cleaned and checked. Marking The equipment must be marked stating that it has been taken out of operation and drained of refrigerant. The marking must be dated and signed. Check that the equipment is marked indicating that it contains combustible refrigerant. Collection Best practice prescribes that all refrigerant is collected safely when the refrigerant is drained from a system, either for servicing or for decommissioning. The refrigerant must only be collected in suitable refrigerant containers. Ensure that the required number of containers, which can hold the entire volume of the system, are available. All containers that are to be used must be intended for the collection of the refrigerant and marked for this refriger- ant (specifically designed for the collection of refrigerant). The containers have to be equipped with correctly functioning pres- sure relief valves and shut-off valves. Empty collection containers must be drained and, if possible, chilled before col- lection. The collection equipment must function correctly and instructions for the equip- ment must be to hand. The equipment must be suitable for the collection of combustible refrigerant. 13NIBE S735 | ENFully functioning and calibrated scales must also be to hand. Hoses must be in good condition and be equipped with leak-proof quick couplings. Before using the collecting machine, check that it is working correctly and has been properly maintained. Associated electrical components must be sealed, to prevent ig- nition if any refrigerant should leak out. Contact the manufacturer if you are in any doubt. Return the collected refrigerant to the refri- gerant supplier in the correct collection container and with the relevant Waste Transfer Note. Do not mix refrigerants in collection devices or containers. If compressors/compressor oil are/is to be removed ensure that the affected device is drained to an acceptable level to ensure that no combustible refrigerant remains in the lubricant. Compressors must be drained before being returned to the supplier. Only electrical heating of the compressor hous- ing may be used to quicken draining. Drain oil from the system in a safe manner. MISCELLANEOUS Maximum amount of refrigerant: See Technical Specifications in the Installer Manual.

Everyone who works with or opens a refri- gerant circuit must have a current, valid certificate from an accredited industry issuing body, which states that, according to the industry's recognised assessment standard, they have the authority to safely handle refrigerants.

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