MAKING MODERN LIVING POSSIBLE. Akva Lux II TDP-F. Instructions for installation and use. Danfoss District Energy

Transcription

1 MAKING MODERN LIVING POSSIBLE Instructions for installation and use Danfoss District Energy

2 substations Type 004U8264 Type Cover for wall-mounting Type Cover for recess mounting 1.0 Contents 1.0 Contents Product introduction , fully insulated - Type A (004U8264) (with bypass thermostat mounted before heat meter) - Type 004U (with bypass thermostat mounted after heat meter) - Type 004U Dimensional sketches / Connections Enduser instructions, General Enduser instructions, initial adjustment/setting Installation instructions, Safety and Handling Installation instructions, Getting started Installation instructions, general Installation instructions, recirculation connection Installation instructions - recirculation connection - Circulation set 1-004U Installation instructions - recirculation connection - Circulation set 2-004U Installation instructions - recirculation connection - Circulation set 3-004U Installation instructions - recirculation connection - Circulation set 4-004U Adjustment and commissioning of the variants Flow regulator Circulation pump - DHW Operation and maintenance Maintenance schedule (recommendations) Trouble shooting Troubleshooting - Heating Troubleshooting - Domestic hot water EU Declaration of Conformity Commissioning Certificate DKDHR VI.HE.A1.02 Danfoss District Energy

3 2.0 Product introduction 5.1, fully insulated - Type (004U8264) DHW DCW DCW DH Supply DH Return Connection for circ. *Option: after heat meter Circ. (option) * Separate fitting set required (see pg. 11). Please contact your local Danfoss sales office. Bypass (Standard) Room thermostat (dly. as loose part) 2 Plate heat exchanger, DHW 4 Differential pressure controller 5 Dirt strainer 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter ½ 24 Fitting piece for heat meter, ¾ x 110 mm 38 PTC2+P controller 40 Danfoss FJVR thermostat for bypass/circulation 52 Zone valve 60 Fitting piece for DCW meter, 3/4 x 80 mm Options: 7 Ball valve 40A Connection for circulation 52A Thermal actuator Danfoss TWA-A NC 53 Room thermostat Danfoss TP Complete safety valve set incl. ball valve 60 mm HE Supply HE Return 2 Plate heat exchanger DHW 4 Differential pressure controller 5 Dirt strainer 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter 24 Fitting piece for heat meter 38 PTC2+P controller 40 Thermostat for bypass/circulation 52 Zone valve 60 Fitting piece for DCW meter Please note that the ball valves are not part of the delivery and must be mounted on site Please note: Your substation may look different than the substation shown, as variants with other components may be supplied. The control function, however, is basically as stated in this instruction manual. Instructions for the fitted components will be supplied together with the substation Connections size: DH, HE, DHW, DCW: Recirc.: G¾ IT R½ ET DCW DHW DCW DH Supply DH Return HE Supply HE Return Domestic water Primary Secundary Danfoss District Energy VI.HE.A1.02 DKDHR 3

4 5.2 (with bypass thermostat mounted before heat meter) - Type 004U8089 DHW DCW Room thermostat (dly. as loose part) 2 Plate heat exchanger, DHW 4 Differential pressure controller 5 Dirt strainer 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter ½ 24 Fitting piece for heat meter, ¾ x 110 mm 38 PTC2+P controller 40 Danfoss FJVR thermostat for bypass/circulation 60 Fitting piece for DCW meter, 3/4 x 80 mm Options: 7 Ball valve 40A Connection for circulation 52 Zone valve Danfoss RA-C / Actuator TWA-A NC 53 Room thermostat 63 Complete safety valve set incl. ball valve 60 mm 69 Return temperature limiter FJVR DCW DH Supply Connection for circ. Circ. (option) Bypass (Standard) HE Supply DH Return HE Return 2 Plate heat exchanger DHW 4 Differential pressure controller 5 Dirt strainer 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter 24 Fitting piece for heat meter 38 PTC2+P controller 40 Thermostat for bypass/circulation 60 Fitting piece for DCW meter Please note that the ball valves are not part of the delivery and mus be mounted on site. Please note: Your substation may look different than the substation shown, as variants with other components may be supplied. The control function, however, is basically as stated in this instruction manual Instructions for the fitted components will be supplied together with the substation. 5 5 Connections size: DH, HE, DHW, DCW: Recirc.: G¾ IT R½ ET DCW DHW DCW DH Supply DH Return HE Supply HE Return 4 Domestic water Primary Secondary DKDHR VI.HE.A1.02 Danfoss District Energy

5 5.3 (with bypass thermostat mounted after heat meter) - Type 004U8044 DHW DCW DCW 2 Plate heat exchanger, DHW 4 Differential pressure controller 5 Dirt strainer 5A Dirt strainer with plug ½ 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter ½ 24 Fitting piece for heat meter, ¾ x 110 mm 30 Return temperature limiter 38 PTC2+P controller 40 Danfoss FJVR thermostat for bypass/circulation 47 Flow limiter 52 Zone valve 54 T-piece (w. ½ plug) 59 Fitting piece for DCW meter, DHW meter 3/4 x 80 mm Options: 7 Ball valve 40A Connection for circulation 52A Actuator TWA-A NC 63 Complete safety valve set incl. ball valve 60 mm DH Supply DH Return Bypass (Standard) HE Supply HE Return 2 Plate heat exchanger DHW 4 Differential pressure controller 5 Dirt strainer 5A Dirt strainer with plug 6 Non-return valve 17 Air vent 23 Sensor pocket for heat meter 24 Fitting piece for heat meter 30 Return temperature limiter 38 PTC2+P controller 40 Thermostat for bypass/circulation 47 Flow limiter 52 Zone valve 54 T-piece with plug 59 Fitting piece for DCW, DHW meter Please note that the ball valves are not part of the delivery and must be mounted on site. Please note: Your substation may look different than the substation shown, as variants with other components may be supplied. The control function, however, is basically as stated in this instruction manual. Instructions for the fitted components will be supplied together with the substation A 4 5 Connections size: DH, HE, DHW, DCW: Recirc.: G¾ IT R½ ET DCW DHW DCW DH Supply DH Return HE Supply HE Return Domestic water Primary Secondary Danfoss District Energy VI.HE.A1.02 DKDHR 5

6 3.0 Dimensional sketches / Connections Type 004U8264:, fully insulated Keyholes for mounting 460 mm 460 mm Connections: 0 Recirculation 1 Domestic cold water (DCW) 2 Domestic hot water (DHW) 3 Domestic cold water (DCW) 4 District heating (DH) supply 5 District heating (DH) return 6 Heating (HE) supply 7 Heating (HE) return 530 mm 575 mm 910 mm 491 mm 550 mm 551 mm 575 mm Depth incl. mounting plate: 115 mm mm 65 mm 65 mm 65 mm65 mm 65 mm 65 mm 7 Connections size: DH, HE, DCW, DHW: ¾ IT 65 mm 65 mm 65 mm 65 mm 65 mm 65 mm 610 mm with recirculation, - in recess box Recirculation: R½ ET Type 004U8089: with bypass thermostat mounted before heat meter. Type 004U mm Keyholes for mounting Type 004U mm Keyholes for mounting Type 004U8044: with bypass thermostat mounted after heat meter. Connections: 1 Domestic cold water (DCW) 2 Domestic hot water (DHW) 3 Domestic cold water (DCW) 4 District heating (DH) supply 5 District heating (DH) return 6 Heating (HE) supply 7 Heating (HE) return mm 65 mm 65 mm 65 mm 65 mm 65 mm 575 mm mm 65 mm 65 mm 65 mm 65 mm 65 mm mm Depth: 150 mm Connections size: DH, HE, DCW, DHW Recirculation: ¾ IT R½ ET 6 DKDHR VI.HE.A1.02 Danfoss District Energy

7 4.0 Enduser instructions, General Instructions Please read these instructions carefully. The manufacturer accepts no liability for loss or damage resulting from failure to comply with these instructions. Read and follow these instructions carefully to prevent the risk of physical injury and/or damage to property. Exceeding the recommended operating parameters appreciably increases the risk of personal injury and/or damage to property. Installation, commissioning and maintenance must be carried out by qualified and authorised personnel (both plumbing and electrical work). Once the station has been installed and is operating, there is normally no need to alter the settings or other functions. The district heating substation is very reliable and easy to operate. If necessary, you can change the temperature settings as described on page 8. For more detailed information about the substation, see the sections concerning installation and commissioning. Description These instructions apply to substation types, which are district heating substations for direct heating for single-family, semi-detached and terraced houses as well as flats. With one heating circuit and instantaneous water heater for domestic hot water heating. The, Type 004U8264 is fully enclosed in an EPP insulation box as a standard. substations are fitted with a differential pressure controller that maintains a constant pressure in the heating circuit(s). The supply temperature to the radiators is always identical to the district heating supply temperature. The room temperature is adjusted solely using the radiator thermostats. The variants are designed for wall mounting and are available as built-in variant with a recess box or as wall-mounted variant. The, types 004U8264 and 004U8089 are supplied with bypass thermostat mounted before heat meter (bypass consumption is registered by the heat meter). For fully insulated, type 004U8264, please note that a fitting set can be ordered separately to enable a change of feature, so that bypass consumption is not registered by the heat meter. Cooling from the water heater alone: During tapping, the level of cooling will typically be C. When domestic hot water is not being tapped, it is completely normal for the return temperature from the water heater to rise slightly. In this situation, the district heating meter will register very modest consumption as the volume of water is very small. On substations with recirculation, the heat meter registers the heat loss in the recirculation pipe. Irregularities When reading the meters, check all joints and connections for leaks. If you identify any irregularities/leaks, contact your professional provider for assistance. Check the troubleshooting section before contacting your professional provider. Warning! Hot surfaces Parts of the substation may be very hot and can cause burn injuries. Be very careful when you are in the immediate vicinity of the unit. Warnings about high pressure and high temperature The maximum supply temperature in the district heating network can be up to 90 C and the operating pressure can be up to 10 bar. This may result in a risk of scalding from touching the substation and from outflow of the medium (water/steam). Exceeding the substation design data and operating parameters for pressure and temperature carries an appreciable risk of personal injury and/or damage to property. Emergencies In the event of fire, leaks or other hazards, immediately shut off all sources of energy to the substation, if possible, and call for appropriate assistance. If the domestic hot water is discoloured or malodorous, shut off all ball valves on the substation notify all users and call for professional assistance without delay., type 004U8044 is supplied with bypass thermostat mounted after heat meter (bypass consumption is not registered by the heat meter). We recommend regular inspections of the substation - ideally in connection with readings of the district heating meter. Pay special attention to any leaks and an excessively high return temperature in the district heating circuit (poor cooling of the district heating water). Cooling i.e. the difference between the supply and return temperature of the district heating water has a significant effect on the overall economy. Therefore, it is important to focus on the supply and return temperature in the heating system. The difference should typically be C in systems that operate with radiators. In systems that feature floor heating, the difference is typically 5 10 C. In these systems, it is important that the supply temperature does not exceed 35 C. Please note that a low district heating return temperature is directly related to the return temperature from the heating/floor heating circuit and the return temperature of the domestic hot water recirculation (in systems with domestic hot water recirculation). It is therefore important to focus on these return temperatures. Danfoss District Energy VI.HE.A1.02 DKDHR 7

8 5.0 Enduser instructions, initial adjustment/setting Domestic hot water control Danfoss PTC2+P controller (Fig. 1) for domestic hot water. Set the DHW temperature by moving the adjuster lever towards + (hotter) or - (colder). Start by turning the lever clockwise until it stops/until you cannot turn it any further. Then turn the lever counter-clockwise until the temperature of the tap water is approx. 48 C during normal tapping flow (7 8 litres per min.). The temperature should never exceed 55 C to prevent limescale deposits building up in the water heater. Option: Alternatively the Akva Lux TDP-F substations may be fitted with a Danfoss PM2+P controller (Fig. 1b) for domestic hot water. Set the DHW temperature by turning the adjuster lever towards red (hotter) or blue (colder). Start by turning the lever clockwise until the pin is opposite the blue dot. Then turn the lever counter-clockwise until the temperature of the tap water is approx. 48 C during normal tapping flow (7 8 litres per min.). The temperature must never exceed 55 C to prevent limescale deposits building up in the water heater. NB! The indicator of temperature setting must be positioned between the blue and red dot, otherwise the controller will shut down. Fig. 1a Fig. 1b Adjuster lever Indicator Adjuster lever Bypass or circulation thermostat Thermostat (Fig. 2) that keeps the branch pipe warm in the summer or regulates the circulation temperature if domestic hot water recirculation has been established in the hot water system. The thermostat should initially be set to position 3. Fig. 2 Heating circuit, Differential Pressure Controller The differential pressure controller (Fig. 3) reduces the high, fluctuating pressure in the district heating network to a constant operating pressure. The differential pressure controller is initially set by the plumber in connection with the commissioning of the substation. If disruptions to the operation occur: noise in the radiator thermostats or poor regulation capacity, it may be necessary to reset the differential pressure controller to a lower or higher operating pressure. We suggest that you contact your local plumber for assistance. Fig. 3 AVPL TD200 Heating circuit, temperature control The room temperature is regulated exclusively using the radiator thermostats. Return temperature limiter Return temperature limiters are used to limit the return temperature of radiators. The return temperature limiter should be set to the required maximum return temperature, in compliance with the local demands. Scale setting (indicative: I = 10 C 1 = 20 C 2 = 30 C 3 = 40 C 4 = 45 C I = 50 C (max. temperature) To ensure sufficient cooling and proper operation the HE return temperature must be lower than the temperature set on the flow controller. 8 DKDHR VI.HE.A1.02 Danfoss District Energy

9 6.0 Installation instructions, Safety and Handling Instructions Please read these instructions carefully before installing and comissioning this substation. The manufacturer accepts no liability for loss or damage resulting from failure to comply with these instructions for use. Read and follow these instructions carefully to prevent the risk of physical injury and/or damage to peroperty. Exceeding the recommended operating parameters considerably increases the risk of personal injury and/or damage to property. Installation, commissioning and maintenance must be carried out by qualified and authorized personnel in compliance with the local safety regulations. Once the station has been installed and is operating, there is normally no need to alter the settings or other functions. The district heating substation is very reliable and easy to operate. Energy source The substation is primarily designed for connection to district heating. Alternative energy sources can be used if the operating conditions are equivalent to district heating at all times. Application The substation is designed only to operate with water or a water-glycol mixture (up to 40%), and other heating media may not be used. The substation is to be connected to the household piping in a frost-free room, where the temperature does not exceed 50 C and the relative humidity is not higher than 80%. The substation must no be covered, bricked in or otherwise cut off from access. Choise of materials Only use materials, that comply with local regulations. Corrosion The maximum chloride compounds of the medium must not be higher than 300 mg/l. The risk of corrosion increases considerably if the recommended chloride content is exceeded. Safety valve(s) Installation of safety valve(s) must always be in compliance with local regulations. Noise level. 55 db. Storage Before installation, the units must be stored in a dry, heated (i.e. frostfree) room. (Relative humidity max. 80% and storage temperature 5-70 C). The units must not be stacked higher than the limit at the factory (max. 8 layers) Units supplied in cardboard packaging must be lifted using the handles incorporated in the packaging. Units must be placed on pallets for transport/moving across large distances. As far as possible, do not lift the substation by the pipes. Lifting by the pipes may cause leaks. REMEMBER to retighten. Disposal Dispose of the packaging in accordance with the local regulations for disposal of used packaging materials. The substation is made of materials that cannot be disposed of together with household waste. Close all energy sources and disconnect all connection pipes. Disconnect and dismantle the product for disposal in accordance with the applicable local regulations for the disposal of the individual components. Connection It must be possible to cut off all energy sources to the unit - including electrical connections - at all times. Potential equalization/grounding Potential equalization is an electrical equalizing connection to secure against user contact with dangerous voltage, which may occur for example between two piping systems. Potential equalization reduces corrosion in heat exchangers, water heaters, district heating substations and plumbing installations. Equalization of potentials should be effected according to local regulations. Warning! Hot surfaces Parts of the substation may be very hot and can cause burn injuries. Be very careful when you are in the immediate vicinity of the substation. Warning of high pressure and high temperature The maximum supply temperature in the district heating network can be up to 90 C and the operating pressure can be up to 10 bar. This may result in a risk of scalding from touching the substation and from outflow of the medium (water/steam). Exceeding the substation design data and operating parameters for pressure and temperature carries an appreciable risk of personal injury and/or damage to property. Emergencies In the event of fire, leaks or other hazards, immediately shut off all sources of energy to the substation, if possible and call for appropriate assistance. If the domestic hot water is discoloured or malodorous, shut off all ball valves on the substation, notify all users and call for professional assistance immediately. Warning of damage during transport On reception of the substation, and before installing it, check for any evidence of damage during transport. The substation must be handled and moved with the greatest care and attention. IMPORTANT - Tightening of connections Before adding water to the system, ALL pipe connections MUST be retightened, as vibrations during transport may have caused leaks. Once the substation has been filled and the system has been put into operation, ALL pipe connections MUST be tightened once more. (Do not overtighten! - See page 11, Test and Connections) Handling We recommend that you wear suitable safety footwear while handling and installing the substation. Danfoss District Energy VI.HE.A1.02 DKDHR 9

10 7.0 Installation instructions, Getting started Connect the substation to the household piping in accordance with the labelling at the bottom and/or in accordance with the instructions in this manual. If the system features DHW recirculation, a recirculation connection must be established on the substation. The circulation set is optional equipment, which must be ordered separately and mounted on site. We recommend establishing recirculation BEFORE mounting the substation on the wall. For instructions about recirculation connection, see pages GETTING STARTED is a quick guide and some details in connection with installation and commissioning may require additional information, which can be found elsewhere in this instruction manual. Commissioning: Please note that the getting started quick guide presupposes that shutt-off possibility is established to and from the substation. - We recommend mounting of ball valves. Please note that ball valves are not part of the delivery for most types of TDP-F substations and must be ordered separately. 1. If the household piping system features domestic hot water recirculation, the substation must be connected to the recirculation system. See pages for further information about DHW recirculation. 2. The substation is prepared for wall mounting. Mount the substation on a solid wall using two sturdy bolts, screws, expansion bolts or similar. 3. Mount ball valves (not part of the delivery) on the substation and make sure that they are closed, when connnecting them to the household piping. 4. Mount the district heating meter (see page 11). 5. IMPORTANT! Tighten all pipe connections, as they may have loosened during transport and handling. 6. On systems that feature a safety valve, establish a drain connection in compliance with the applicable legislation. 13. Now switch on the pump and automatic components, if any. 14. Finish by adjusting the substation in accordance with this instruction manuals. Heating and cooling of the system may cause leaks. Therefore it may be necessary to retighten the connections in the period after commissioning. 7. Open the ball valve for the HE supply and return flow and fill the system with water by carefully opening the ball valve for the district heating supply flow and at the same time venting the system. Finally, open the ball valve for the district heating return flow. (Please note that the ball valves are not part of the delivery). 8. Check the substation and the household piping thoroughly for leaks. 9. Pressure test the entire system for leaks in accordance with the applicable regulations. 10. Connect pump and automatic components, if any, to the electricity supply, but do not switch on the power. 11. Heat the system and vent the radiator circuit/heating side thoroughly on the radiators and the air valve, if any. 12. For TDP-F stations, which include zone valve and actuator, remember to remove the red split on the position indicator of the actuator after installation. 10 DKDHR VI.HE.A1.02 Danfoss District Energy

11 8.0 Installation instructions, general The installation, connection and maintenance of the substation must be performed by qualified and authorised personnel. Installation must always be performed in accordance with the applicable legislation and in compliance with these instructions. The substation must be installed so that it is freely accessible and can be maintained without unnecessary disruption. Lift the substation by its mounting plate/rear section and secure it to a solid wall using 2 sturdy bolts, screws or expansion bolts positioned in the two keyholes in the mounting plate/rear section. Before commissioning, rinse all the pipes in the household piping system thoroughly to remove any impurities, and check and clean the dirt strainers in the substation. Connect the substation to the household piping in accordance with the labelling at the bottom and/or in accordance with the instructions in this manual. Test and connections Before filling the system with water, retighten all the pipe connections because vibrations and shocks during transport and handling may have caused leaks. Once the system has been filled with water, tighten all the pipe connections once more before performing pressure test for leaks. After heating of the system, check all the connections and retighten if necessary. Please note that the connections features EPDM rubber gaskets! Therefore, it is important that you DO NOT OVERTIGHTEN the union nuts. Over-tightening may result in leaks. Leaks caused by over-tightening or failure to retighten connections are not covered by the warranty. Heat meter, fitting pieces. The substation is equipped with fitting pieces for heat meter on the district heating return line. Fitting of heat meters - Close the ball valves on the district heating and the heating sides. - Loosen the union nuts at both ends of the fitting piece and remove it. - Fit the heat meter, - remember to insert gaskets. - Mount sensor, - remember to insert gaskets. - After mounting of heat meter remember to check and tighten all pipe connections before commissioning the substation. The heat meter consists of flow meter, two temperature sensors for mounting in DH supply and return and a microprocessor calculator for the calculation of energy consumption. On the LCD display of the calculator the energy consumption can be read. For, fully insulated, a cut-out in the front insulation cover makes it possible to build in the calculator of the heat meter in the font insulation, - please see photos to your right, - and thus enable easy reading of the exact energy consumption on the LCD display. Please note that for, fully insulated, it is possible to perform change of feature to enable that bypass consumption is not registered by the heat meter. This requires a fitting set, which is available as extra equipment. Please contact your local Danfoss sales office for further information and for placement of order for this. Danfoss District Energy VI.HE.A1.02 DKDHR 11

12 Mounting of temperature sensors As standard the heat meter is supplied with temperature sensors for measuring the supply and return flow temperatures. The Akva Lux II S-F flat station is prepared for mounting of temperature sensors with M10x1 connection (see photo to the right): The supply flow sensor is mounted in the sensor pocket on DH supply (pos A.) - demount M10 plug (Pos. A) - insert one temperature sensor in the sensor pocket - tighten temperature sensor union nut Mount the return flow sensor in the heat meter housing (pos. B). A A B Cold water meter(s), fitting pieces. The substation is equipped with fitting piece(s) for cold water meter(s). Fitting of cold water meter(s) - Close the ball valves on the domestic cold water and the domestic hot water supply. - Loosen the union nuts at both ends of the fitting piece and remove it. - Fit the cold water meter, - remember to insert gaskets. - After mounting of cold water meter remember to check and tighten all pipe connections before commissioning the cold water meter(s). Hot water meter, fitting piece The substation can be equipped with fitting piece for hot water meter. Fitting of hot water meter - Close the ball valves on the domestic cold water and the domestic hot water supply. - Loosen the union nuts at both ends of the fitting piece and remove it. - Fit the hot water meter, - remember to insert gaskets. - After mounting of hot water meter remember to check and tighten all pipe connections before commissioning the hot water meter. Meter display (reading of meter dials) For easy reading of the meter display, the lower right corner of the front insulation can easily be removed, as shown in the photo to your right. 12 DKDHR VI.HE.A1.02 Danfoss District Energy

13 TWA-A For Danfoss RA valves TWA-V For Danfoss RAV/VMT valves TWA-L For Danfoss RAVL valves TWA-K For Heimeier/MNG/Oventrop valves with M connection, generally as per attached drawing. Other valves must be verified individually to ensure correct valve closing measurement and valve top geometry. TWA-D For Danfoss RTD valves *) 24 V Class II transformer (SELV) **) 230 V max. 3 A pre-fuse VI.SB.H Produced by Danfoss Industri Service JJ-Bi.DS Instructions for installation and use Zone valve / thermal actuator TWA-A The can be supplied with zone valve/thermal actuator TWA-A, which enables connection to an electronic programmable room thermostat. The thermal actuator of the zone valve is switched on by an external contact from the room thermostat, and starts to open or close the valve. The actuating movement is achieved by means of an electrically heated expansion element. When the heating current is switched off, the actuator shuts or opens the valve. The actuator is equipped with a visual position indicator to show the open or closed position of the valve. INSTRUCTIONS TWA NC 088R Version 03 Thermal actuator TWA-A Electronic programmable room thermostat (option) If the substation is connected to a room thermostat the temperature is controlled by the room thermostat and radiator thermostats. Please note that the room thermostat keeps the temperature at a constant level in the whole apartment according to the set room parameters. Consult additional maintenance instructions for room thermostat for further information. It is recommended to avoid fully opened thermostats on some radiators and fully shut-off on others. Higher temperature at the top and lower temperature at the bottom part of radiators means that the system operation is correct. To keep correct temperature and friendly microclimate for human beings in the apartment, it is recommended to ensure regular airing in rooms. Danfoss District Energy VI.HE.A1.02 DKDHR 13

14 Safety valve As optional equipment the substation can be equipped with a safety valve set. Please note that this is not part of the delivery and must be ordered separately and mounted on site. Always establish a blow-off pipe from the safety valve. The blow-off pipe must be lead to a drain in accordance with applicable legislation. Please note that installation of safe valve set is possible only for installations with 120 mm ball valves. See separate installation guide for mounting of safety valve set. 1 The safety valve set includes two different pipes, as it is prepared for mounting on flat stations with and without circulation set. Illustration 1 to the right shows with safety valve set only. Illustration 2 to the right shows with circulation set and safety valve set Installation instructions, recirculation connection If the household piping system features domestic hot water recirculation, the substation must be connected to the recirculation system. The circulation set for recirculation connection is not standard equipment. The set must be purchased as extra equipment. We recommend establishing recirculation BEFORE mounting the substation on the wall. Connect the recirculation pipe from the fixed household piping to the hexagon nipple at the bottom of the substation, - see photo to your right. Remember always to mount circulation pump and non-return valve to the circulation pipe and to mount safety valve on the DCW inlet. The pump must be installed so that the pump is pumping water towards the substation. A safety valve must be mounted in the DCW inlet. If a time-controlled pump is used, we recommend setting of the circulation water temperature to approx. 35 C. Please note that if the circulation pump (outside the substation) is stopped for a protracted period, we recommend that the bypass thermostat is shut off for the same period. Connection to the household recirculation pipe Please note that four circulation sets for recirculation connection are available as optional equipment. The four circulation sets and and control change possibilities from bypass to DHW recirculation will be described thoroughly on pages 15 to DKDHR VI.HE.A1.02 Danfoss District Energy

15 Instructions for installation and use 9.1 Installation instructions - recirculation connection - Circulation set 1-004U8400 G1 G2 I E2 M J L H A B C K E1 F D You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet., Type 004U8264 Fig. 1 Remove the nipples/plugs from the domestic hot water controller (use a 6 mm Allen key). Fig. 2 Mount hexagon nipple A in the DHW controller (pack). Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 VI.HE.A1.02 Fig. 8 Fig. 3 Fit pipe bushing B in the DHW controller. Fig. 4 Loosen union nuts and remove the existing capillary tube between the bypass thermostat and the T-piece (as shown in fig. 4). Fig. 5 Plug the hole with ball C and union nut D. Fig. 6 Fit new capillary tube E1 by means of cutting rings F and union nuts D between the bypass thermostat and the pipe bushing B. Tighten with single end wrench. Fig. 7 Fit circulation hose end G1 in hexagon nipple A (do not forget gasket!), and fit the hose through the cut-out in the left side of the rear insulation cover. Fig. 8 Mount bracket H for recirculation connection on the mounting rail, as shown, and fasten by means of two screws I. Danfoss District Energy DKDHR 15

16 Fig. 9 Mount non-return valve J and hexagon nipple K in the pump, as shown on the photo to your right. J Fig. 10 Loosen union nut. Fig. 11 Turn pump motor head by 180 degrees. Tighten the union nut again. Fig. 9 K Fig.10 Fig. 12 Please note that the arrow on the back of the housing indicates the dirction of flow. - Please note the position of the arrow as shown in the photo to your right. Fig. 13 Fit pump in bracket H and fasten with locknut L. Fig. 11 Fig.12 Fig. 14 Fit circulation hose end G2 in non-return valve J. (Do not forget gasket!) Fig. 13 Fig.14 with bypass-function., prepared for domestic hot water recirculation. 16 DKDHR VI.HE.A1.02 Danfoss District Energy

17 G2 M E2 L J B C You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet. K I D A F H E1 G1, Type 004U8089 Cover for wall mounting Fig. 1 Remove the nipples/plugs from the domestic hot water controller (use a 6 mm Allen key)., Type 004U8044 Cover for recess mounting Fig. 2 Mount hexagon nipple A in the DHW controller (pack). Fig. 3 Fit pipe bushing B in the DHW controller. Fig. 1 Fig. 2 Fig. 4 Remove the existing capillary tube and union nut from bypass thermostat and angle piece (do not re-use). Fig. 5 Plug the hole in the angle piece with the steel ball C and a union nut D. Fig. 3 Fig. 4 Fig. 6 Fit new capillary tube E2 in bypass thermostat by means of cutting rings F and a union nut D. Tighten with single end wrench. Fig. 5 Fig. 6 Danfoss District Energy VI.HE.A1.02 DKDHR 17

18 Fig. 7 Fit/screw hose end G1 onto the hexagon nipple A and fit the other end of the capillary tube E2 in pipe bushing B by means of a cutting ring F and a union nut D. Tighten with single end wrench. Fig. 8 Mount bracket H for recirculation connection on the mounting rail, as shown, and fasten by means of two screws I. Fig. 9 Mount non-return valve J and hexagon nipple K in the pump, as shown in the photo to your right. Fig. 7 Fig. 8 J Fig. 10 Loosen union nut. Fig. 11 Turn pump motor head by 180 degrees. Tighten the union nut again. Fig. 9 K Fig.10 Fig. 12 Please note that the arrow on the back of the housing indicates the dirction of flow. - Please note the position of the arrow as shown in the photo to your right. Fig. 13 Fit pump in bracket H and fasten with locknut L. Fig. 11 Fig.12 Fig. 14 Fit circulation hose end G2 in non-return valve J. (Do not forget gasket!) Fig. 13 Fig DKDHR VI.HE.A1.02 Danfoss District Energy

19 Instructions for installation and use PLEASE NOTE (only for 004U8044): For systems with DHW recirculation the bypass thermostat must alway be installed before the heat meter. On substations, that are supplied with bypass thermostat mounted after the heat meter (, Type 004U8044), the bypass thermostat must therefore be relocated before the substation is prepared for recirculation, - i.e. the bypass thermostat must be mounted before the heat meter. Please follow the below instructions: 1. Start by shutting off all connections to the substation. 2. First follow the instructions for Fig. 1, 2 and 3 on page 16. A C 3. Then demount 3/4 plug in T-piece (pos. A), as illustrated in fig Remove the existing capillary tube from pos. C to D. See fig. 2. D Fig. 1 A 5. Demount bypass thermostat incl. 3/4 reducer bushing from pos. B. Unscrew 3/4 reducer bushing from bypass thermostat (the 3/4 reducer bushing is not to be reused). See fig Mount bypass thermostat in pos A, as illustrated in fig. 4. Fig. 2 B Fig. 3 Fig Plug the hole in pos. B with 3/4 plug (from pos A) and gasket, as illustrated in fig Plug the hole in pos. D with a steel ball and 6 mm union nut. 9. Finally follow instructions for fig. 6 to 14 on pages 16 and 17. Danfoss District Energy D B Fig. 5 VI.HE.A1.02 Fig. 6 DKDHR 19

20 9.2 Installation instructions - recirculation connection - Circulation set 2-004U8401 G2 E2 L J B C You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet. K I D A F H G1 E1, Type 004U8264 For recirculation connection please refer to installation instructions for circulation set 1-004U8400., Type 004U8089 Cover for wall mounting, Type 004U8044 Cover for recess mounting 20 DKDHR VI.HE.A1.02 Danfoss District Energy

21 9.3 Installation instructions - recirculation connection - Circulation set 3-004U8403 A B D E C F G G1 H You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet., Type 004U8264 Fig. 1 Remove the nipples/plugs from the domestic hot water controller (use a 6 mm Allen key). Fig. 2 Mount hexagon nipple A in the DHW controller (pack), and mount hexagon nipple C and union nut D in hexagon nipple A (for fitting of recirculation pipe. Fig. 1 Fig. 2 Fig. 3 Fit pipe bushing B in the DHW controller. Fig. 4 Loosen union nuts and remove the existing capillary tube between the bypass thermostat and the T-piece (as shown in fig. 4). Fig. 3 Fig. 4 Fig. 5 Plug the hole with ball C and union nut D. Fig. 6 Fit new capillary tube G1 by means of cutting rings F and union nuts D between the bypass thermostat and the pipe bushing B. Tighten with single end wrench. Fig. 5 Fig. 6 Danfoss District Energy VI.HE.A1.02 DKDHR 21

22 A B D E C F G G1 H You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet., Type 004U8089 Cover for wall mounting Fig. 1 Remove the nipples/plugs from the domestic hot water controller (use a 6 mm Allen key)., Type 004U8044 Cover for recess mounting Fig. 2 Mount hexagon nipple A in the DHW controller (pack), and mount hexagon nipple C and union nut D in hexagon nipple A (for fitting of recirculation pipe. Fig. 1 Fig. 2 Fig. 3 Fit pipe bushing B in the DHW controller. Fig. 4 Remove the existing capillary tube and union nut from bypass thermostat and angle piece (do not re-use). Fig. 5 Plug the hole in the angle piece with steel ball E and union nut F. Fig. 3 Fig. 4 Fig. 6 Fit new capillary tube G in bypass thermostat by means of a cutting ring H and a union nut F. Tighten with single end wrench. Fig. 5 Fig DKDHR VI.HE.A1.02 Danfoss District Energy

23 Instructions for installation and use Fig. 7 Fit the other capillary tube end G in pipe bushing B by means of a cutting ring H and a union nut F. Tighten with single end wrench. Fig. 7 PLEASE NOTE (only for 004U8044): For systems with DHW recirculation the bypass thermostat must alway be installed before the heat meter. On substations, that are supplied with bypass thermostat mounted after the heat meter (, Type 004U8044), the bypass thermostat must therefore be relocated before the substation is prepared for recirculation, - i.e. the bypass thermostat must be mounted before the heat meter. Please follow the below instructions: 1. Start by shutting off all connections to the substation. A 2. First follow the instructions for Fig. 1, 2 and 3 on page 21. C D 3. Then demount 3/4 plug in T-piece (pos. A), as illustrated in fig Remove the existing capillary tube from pos. C to D. See fig. 2. Fig Demount bypass thermostat incl. 3/4 reducer bushing from pos. B. Unscrew 3/4 reducer bushing from bypass thermostat (the 3/4 reducer bushing is not to be reused). See fig. 3. Fig. 2 A B 6. Mount bypass thermostat in pos A, as illustrated in fig Plug the hole in pos. B with 3/4 plug (from pos A) and gasket, as illustrated in fig. 5. Fig. 3 Fig Plug the hole in pos. D with a steel ball and 6 mm union nut. D B 9. Finally follow above instructions for fig. 6 and 7 on pages 21 and 22. Danfoss District Energy Fig. 5 VI.HE.A1.02 Fig. 6 DKDHR 23

24 9.4 Installation instructions - recirculation connection - Circulation set 4-004U8405 C A B E F G H D You must always fit a pump and a non-return valve to the recirculation pipe, with flow direction towards the substation. A safety valve must be mounted in the DCW inlet., Type 004U8089 Cover for wall mounting PLEASE NOTE! This circulation set can be mounted only on substations without insulation. Fig. 1 Remove the nipples/plugs from the domestic hot water controller (use a 6 mm Allen key)., Type 004U8044 Cover for recess mounting Fig. 2 Mount hexagon nipple A in the DHW controller (pack). Fig. 3 Mount circulation pipe C, incl. hexagon nipple D, in hexagon nipple A. Fig. 1 Fig. 2 Fig. 4 Fit pipe bushing B in the DHW controller. Fig. 5 Remove the existing capillary tube and union nut from bypass thermostat and angle piece (do not re-use). Fig. 3 Fig. 4 Fig. 6 Plug the hole in the angle piece with steel ball E and union nut F. Fig. 5 Fig DKDHR VI.HE.A1.02 Danfoss District Energy

25 Instructions for installation and use Fig. 7 Fit the new capillary tube G in the bypass thermostat by means of a cutting ring H and a union nut F. Tighten with single end wrench. Fig. 8 Fit the other capillary tube end in the pipe bushing by means of a cutting ring H and a union nut F. Tighten with single end wrench. Fig. 7 Fig. 8 PLEASE NOTE (only for 004U8044): For systems with DHW recirculation the bypass thermostat must alway be installed before the heat meter. On substations, that are supplied with bypass thermostat mounted after the heat meter (, Type 004U8044), the bypass thermostat must therefore be relocated before the substation is prepared for recirculation, - i.e. the bypass thermostat must be mounted before the heat meter. Please follow the below instructions: 1. Start by shutting off all connections to the substation. A 2. First follow the instructions for Fig. 1, 2, 3 and 4 on page 23. C D 3. Then demount 3/4 plug in T-piece (pos. A), as illustrated in fig. 1. Fig Remove the existing capillary tube from pos. C to D. See fig Demount bypass thermostat incl. 3/4 reducer bushing from pos. B. Unscrew 3/4 reducer bushing from bypass thermostat (the 3/4 reducer bushing is not to be reused). See fig. 3. Fig. 2 A B 6. Mount bypass thermostat in pos A, as illustrated in fig Plug the hole in pos. B with 3/4 plug (from pos A) and gasket, as illustrated in fig. 5. Fig. 3 Fig Plug the hole in pos. D with a steel ball and 6 mm union nut. D B 9. Finally follow above instructions for fig. 7 and 8 on this page. Fig. 5 Danfoss District Energy VI.HE.A1.02 Fig. 6 DKDHR 25

26 10.0 Adjustment and commissioning of the variants General information PLEASE NOTE! Some models may have a slightly different appearance, but the control function is in principle the same as described below. Maintenance and commissioning The insulation front panel on, Type 004U8264 can be removed without using tools. Take hold in the right side of the front insulation and pull carefully forward until the front insulation section releases from the rear section. Fasten the front insulation section with a slight pressure on the sides and upper part. Please note that the, Type 004U8264 is not mechanically fixed in the rear insulation section and must be handled by lifting in both pipes and insulation simultaneously. The cover on, Type 004U8089 and 004U8044 and be removed without using tools. Perform maintenance procedures according to the maintenance frequency chart presented in the section entitled Operation and maintenance on pages Perform adjustment in accordance with the instructions below. For cleaning of plate heat exchanger, please see page 30. Type 004U8264 Type 004U8089 Type 004U8044 Commissioning Commission the substation in accordance with the instructions on pages Domestic hot water The domestic hot water is prepared in the heat exchanger based on the flow principle and the temperature is controlled by a combined hydraulic and thermostatic self-acting controller PTC2+P (Fig. 1a) with integrated differential pressure controller, which blocks the flow of primary and secondary side flow through the heat exchanger immediately after completion of the tapping process. Option: Alternatively the temperature is controlled by a hydraulic self-acting controller PM2+P (Fig. 1b). Regulation of the hot water temperature PTC2+P Set the DHW temperature by moving the adjuster lever towards + (hotter) or - (colder). Start by turning the lever clockwise until it stops/until you cannot turn it any further. Then turn the lever counter-clockwise until the temperature of the tap water is approx. 48 C during normal tapping flow (7 8 litres per min.). Regulation of the hot water temperature PM2+P Set the DHW temperature by turning the adjuster lever towards red (hotter) or blue (colder). Start by turning the lever clockwise - until the pin is opposite the blue dot. Then turn the lever counter-clockwise until the temperature of the tap water is approx. 48 C during normal tapping flow (7 8 litres per min.). NB! The pin must be positioned between the blue and red dot, otherwise the controller will shut down. The temperature must never exceed 55 C to prevent limescale deposits building up in the water heater. By-pass function (factory connection). The substations are supplied with the a Danfoss FJVR bypass thermostat (Fig. 2), so that when water is tapped, the water heater immediately starts to produce hot water. We re-commend setting of the thermostat in pos. 3. If you have to wait a long time (i.e. more than 20 sec.) for hot water, it may be necessary to position the thermostat higher than pos. 3. If you want to avoid waiting time altogether, you will need to set up domestic hot water recirculation to the tapping points. Circulation thermostat / conversion to recirculation. In systems with recirculation, the thermostat (Fig. 2) functions as a circulation thermostat, and the temperature of the circulation water can be set independently of the domestic hot water temperature selected. We recommend setting of the thermostat to pos. 3. For instructions about how to set up a recirculation connection, see pages DKDHR VI.HE.A1.02 Danfoss District Energy Fig. 1a Fig. 1b Fig. 2 Adjuster lever Indicator Adjuster lever Scale setting (indicative) Pos. 2 = 30 C 3 = 40 C 4 = 45 C

27 SIBC VI.CB.T1.6K Danfoss 05/03 1 r kpa Instructions for installation and use Differential pressure controller The differential pressure controller reduces the high, fluctuating pressure in the district heating network, ensuring constant operating pressure and thereby ensures the best possible operating conditions. Differential pressure controller AVPL As standard a differential pressure controller type AVPL is mounted in, type 004U8264. The differential pressure controller is pre-set to 0.1 bar from the factory. To alter the differential pressure, use an Allen key NV3. One full turn is equivalent to 0.01 bar. Turn clockwise to increase the pressure, counterclockwise to reduce it. Recommended setting Basically, it is recommended to open the controller to its full extent. If disruptions to operation arise, such as noise or fluctuations/poor regulation capacity, it may be necessary to adjust the differential pressure controller to a lower operating pressure. The controller can be adjusted subsequently see the appendix entitled: Instructions AVPL 1.0/1.6 Instructions AVPL 1.0/1.6 TD200 AVPL Differential pressure controller TD200 As standard a differential pressure controller type TD200 is mounted in types 004U8089 and 004U8044. This type of differential pressure controller is preset from factory and should not be adjusted afterwards Heating circuit, temperature control The room temperature is regulated exclusively using the radiator thermostats. Return temperature limiter Return temperature limiters are used to limit the return temperature of radiators. The return temperature limiter FJVR is a self-acting P-band regulator, which regulates according to the temperature of the heating medium. The FJVR includes a thermostatic element and a valve body. Once the set temperature is exceeded, the valve shuts down and reopens only when the temperature has dropped below the set value. The return temperature limiter should be set to the required maximum return temperature, in compliance with the local demands. Scale setting (indicative: I = 10 C 1 = 20 C 2 = 30 C 3 = 40 C 4 = 45 C I = 50 C (max. temperature) To ensure sufficient cooling and proper operation the HE return temperature must be lower than the temperature set on the flow controller. Danfoss District Energy VI.HE.A1.02 DKDHR 27

28 Anlæg Systems Anlagen Blandekreds på gulvvarmeanlæg. Floor-heating system. Fussboden-Mischkreis. Système de chauffage au sol. Menginjectie-systeem in vloerverwarming Blandningskrets i golvvärmeanläggning. Lattialämmitysjärjestelmä. Ogrzewanie podłogowe. Montage af termostatisk element 1) Mounting of thermostatic head Montage von Thermostatkopf Montage de la tête thermostatique Montage van regelelement Montering av regulatordel Termostaatin asennus Mocowanie głowicy termostatycznej 2) Montage af fjernføler Mounting of remote sensor Montage von Fernfühler Montage du capteur à distance Montage van afstandsvoeler Montering av lös givare Anturin asennus Mocowanie zdalnego czujnika Système Installatie Anläggning Blandekreds på radiator- eller gulvvarmekreds med veksler. Heat exchanger in radiator heating or floor heating system. Wärmetauscher-Regelung für Heizkörper- und Fussbodenheizung. Echangeur thermique dans un système de chauffage par radiateur ou au sol. Warmtewisselaar in radiator- of vloerverwarmingsysteem. Blandningskrets i radiator- eller golvvärmekrets med värmeväxlare. Lämmönvaihdin radiaattori- tai lattialämmitysjärjestelmässä. Wymiennik ciepła w instalacji z grzejnikami lub podłogowej. 3) Järjestelmät Zastosowanie Instructions for installation and use Electronic programmable room thermostat The types 004U8264 and 004U8044 are equipped with a zone valve, and thereby prepared for fitting of a thermal actuator TWA-A, which enables connection to an electronic programmable room thermostat. The thermal actuator is switched on by an external contact from the room thermostat, and starts to open or close the valve. The actuating movement is achieved by means of an electrically heated expansion element. When the heating current is switched off, the actuator shuts or opens the valve. The actuator is equipped with a visual position indicator to show the open or closed position of the valve. INSTRUCTIONS FTC 013R R9319 Please note: Before mounting of the electronic room thermostat, an thermal actuator TWA-A for ON/OFF controls of the heating system must be mounted on the zone valve. Thermal actuator TWA-A If the substation is connected to a room thermostat the temperature is controlled by the room thermostat and radiator thermostats. Please note that the room thermostat keeps the temperature at a constant level in the whole apartment according to the set room parameters. Consult additional maintenance instructions for room thermostat for further information. It is recommended to avoid fully opened thermostats on some radiators and fully shut-off on others. Higher temperature at the top and lower temperature at the bottom part of radiators means that the system operation is correct. To keep correct temperature and friendly microclimate for human beings in the apartment, it is recommended to ensure regular airing in rooms Flow regulator A flow regulator is a control device, which, irrespectively of mains pressure, maintains the designated flow rate. This means that the flow regulator automatically equalizes all changes in pressure within a large pressure range (normally 1 to 10 bar), and thereby ensures a constant. flow regardless of water supply pressure. Even at low pressures the required flow is obtained. At high pressures no unnecesssary water is wasted; in fact much water and energy can be saved by using flow regulators. 28 DKDHR VI.HE.A1.02 Danfoss District Energy

29 D Einbau- und Betriebsanleitung GB Installation and operating instructions F Notice de montage et de mise en service E Instrucciones de instalación y funcionamiento I Istruzioni di montaggio, uso e manutenzione GR Οδηγίες εγκατάστασης και λειτουργίας TR Montaj ve kullanma k lavuzu H Beépítési és üzemeltetési utasítás PL Instrukcja montażu i obsługi CZ Návod k montáži a obsluze RUS Инструкция по монтажу и эксплуатации LV Uzstādīšanas un ekspluatācijas instrukcija LT Montavimo ir naudojimo instrukcija SK Návod na montáž a obsluhu Instructions for installation and use 12.0 Circulation pump - DHW As a standard the circulation set 1 comprises a circulation pump WILO-STAR-Z NOVA. Pump start-up Do not start up the pump until the system has been filled with the flow media. The pump vents itself automatically after a short operational period. Short-term dry-running will not harm the pump. Supply voltage: Power consumption: 230 V a.c Hz Max. 4.5 Watt For more information about the pump please refer to enclosed installation and maintenance instructions: WILO-STAR-Z NOVA Installation and operating instructions Wilo-Star-Z NOVA Ed.01/ Danfoss District Energy VI.HE.A1.02 DKDHR 29

30 13.0 Operation and maintenance Maintenance work Is only to be carried out by qualified and authorised personnel. Inspection The water heater should be checked regularly by authorised personnel. Any necessary maintenance must be performed in accordance with the instructions in this manual and other sets of instructions. During service the dirt strainers are to be cleaned including the filter on the controller, all pipe connections must be tightened and the safety valve must be function tested by turning the lever. Rinsing/cleaning of plate heat exchanger To clean the plate heat exchanger, rinse it by running clean water through the exchanger at high speed and in the opposite direction to the normal flow. This will remove any dirt deposits that may have built up in the exchanger. If rinsing with clean water is not sufficient, the exchanger can also be cleaned by circulating a cleaning agent approved by Danfoss (e.g. Kaloxi or Radiner Fl cleaning fluid) through the exchanger. Both these cleaning fluids are environmentally friendly and can be disposed off through the standard sewer system. After use of a cleaning fluid, the plate heat exchanger must be rinsed thoroughly with clean water. Acid cleaning of plate heat exchanger Deposits of limescale may build up in plate heat exchangers for domestic hot water on account of the large temperature fluctuations, and because aerated water is used on the secondary side. If it becomes necessary to clean the exchanger with acid, this can be done as shown on the drawing to the right. Brazed plate heat exchangers can withstand rinsing with a dilute acid sulution - e.g. 5% formic, acetic or phosphoric acid). Measures after maintenance work After maintenance work and before commissioning: Check that all screwed connections are tight. Check that all safety features, covers, that were removed, have been replaced properly. Clean the working area and remove any spilled materials. Clear all tools, materials and other equipment from the working area. Connect to energy supply and check for leaks. Vent the system. Carry out any necessary adjustment again. Make sure that all safety features on the device and the system work properly. Meter reading The caretaker/owner must perform visual checking and reading of the district heating meter at short, regular intervals. (The meter is not a part of the delivery from Danfoss). Service procedures must only be performed by trained, authorised personnel. NB! Excessive consumption for whatever reason is not covered by the Danfoss warranty. Cooling / Return temperature reading Cooling i.e. the difference between the supply and return temperature of the district heating water has a significant effect on overall energy economy. Therefore, it is important to focus on the supply and return temperature in the heating system. The difference should typically be C. Please note that a low district heating return temperature is directly related to the return temperature from the heating circuit and the return temperature of the circulation water. It is therefore important to focus on these return temperatures. 30 DKDHR VI.HE.A1.02 Danfoss District Energy