AHD 290 - Boiler A.O. Smith - Free user manual and instructions

USER MANUAL AHD 290 A.O. Smith

1. About the product

1.1 Scope of delivery

1.5.1 Requirement for the water circuit

2. Before installation / Placement into

2.1 Important safety instructions

2.1.1 Cooling system – safety instructions

2.1.2 Electrical system – safety instructions

2.1.3 Water circuit – safety instructions

2.4.1 Transport with forklift

2.4.2 Unloading the heat pump

2.4.3 Transport with trolley

2.5 Placement / set-up

2.6 Connection of water pipes

3.1 Water connection

3.2 Placement of pipe connections

3.3 Connection of condensation drain

3.4 Air intake and exhaust

4. Placement into service / operation

4.1 Demands to the hot water circuit

4.2 Starting to use the water circuit

4.3 Placement in to service of the water circuit

4.4 Electricity - connecting

4.6 Hints for energy savings

1.2 Altering of the operation data

2.3 Operation safety

3.2 Water circuit and tank

3.3 Demounting/Putting the unit out of

4.1 High pressure switch

4.2 Safety breaker for heating element

4.3 Heat pump will not run

64When construction and building the heat pump all relevant EU guidelines have been followed. (Also see EU-declaration of conformity.) Any work carried out on this unit may only be done by skilled personnel. Take all necessary precautions to avoid accidents.

1.1 Scope of delivery

• Heat pump with built-in controls

• Installation manual with technical data

• Operating instructions

1.2 Product description

The AHD 290 is a domestic water heat pump with a condenser on the outside of the tank. The application area and operating principles of the heat pump are specied in the operating instructions.

Performance data Performance specied for heating of domestic water from 15°C to 45°C Thermal output (with air 15°C / water 15°C – 45°C) kW 1,52 Power input (with air 15°C / water 15°C – 45°C) kW 0,43 COP (with air 15°C / water 15°C – 45°C) 3,54 Power consumption electrical cartridge / heating element kW 1,5 Operating range / limits Max. air temperature °C 35 Max. water temperature °C 55 Max. water temperature (with operation of heat pump and electric car- tridge) °C 65 Sound level 1 meter in front of unit dB(A) 52 Domestic water container Material Steel specially enamelled Net volume l 285 Airow volume Airow volume m³/h 250

1. About the product

391.4 Refrigerant circuit – description

The cooling system is used for processing the heat in the inlet air. This is the manner by which the extracted heat is transferred to the water. This process is only possible with the external addition of energy, which takes place in the com- pressor. In the vaporizer, heat is absorbed from the air and refrigerant in gaseous form and fed to the compressor. In the compressor, the refrigerant is raised up to a higher pressure and energy level, so it can deliver the heat to the water through the con- denser pipe, which is coiled around the tank. The condensed coolant uid is throttled down to a lower pressure using the expan- sion valve so it becomes possible to repeat the cooling cycle in the vaporizer.

1.4.1 Cooling system - description

The skilled technician must make sure that all refrigerant carrying parts are emp- tied to a level where work may be carried out without any risk to people or materi- als, before repairs and services are carried out. When repairing and servicing the heat pump in which the refrigerant system has to be opened, always take extra care. If the use of an open ame is needed, (Weld- ing, soldering etc.) special care must be taken in order to prevent re.

1.4.2 Electrical circuit - description

When work is carried out on the heat pump, the main supply must be discon- nected. (Pull the plug.) When the unit is connected to the supply all local and national regulations must be followed, along with the demands from the power supplier.

1.4.3 Water circuit - description

Only water in drinking quality may be used. During installation the choice of material must be taken into account, and made sure those are compatible in the entire circuit. Safety equipment must be installed to prevent over pressure in the system. All pipe work must comply with water safety regulations.

The water circuit will be constructed with respect to the applicable norms and re- quirements. Please see the specications in sections 3.1 and 3.2.

1.5.1 Requirements for the water circuit

Depending upon the materials used in the water circuit of the dwelling, incorrect material combinations can lead to corrosion damage due to galvanic corrosion. This requires special attention with the use of galvanized components and components that contain copper.

Dimensions (all measurements are in mm, except when indicated other wise) Description AHD 290 A Total height 1815 B Height of top of appliance 1790 D Appliance diameter 660 G1 Air inlet diameter 160 G2 Air outlet diameter 160 H Height air in-/outlet 1815 Hx1 x-position air inlet 190 Hx2 x-position air outlet 480 Hy1 y-position air inlet 200 Hy2 y-position air outlet 470 J Height air inlet 60 M Height of cold water supply 110 N Height of hot water outlet 1410 P Height of cleaning opening 45 V Height of recirculation connection 820 W Height condensation drain 1345 Z Height of electric element connection 925 1 Cold water supply connection (male) R 3/4” 2 Hot water outlet (male) R 3/4” 6 Cleaning/inspection opening Ø 110 7 Condensation drainage connection (female) Ø 12 11 Electric element connection (female) G 1 1/2” 14 Recirculation connection (female) R 3/4”43

Legends Only applicable numbers are mentioned.

1. pressure-reducing valve

(mandatory if the mains water pressure exceeds 8 bar)

4. stop valve (recommended in pipe

C and mandatory in pipe A)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve (mandatory)

11. service stop valve

14. hot water draw-off points

15. expansion valve (mandatory)

T5 - Sensor before the coil T6 - Sensor on the coil T7 - Sensor in the top of the tank T8 - Sensor in the bottom of the tank 90° 2-pol Must have earth connection

Placement into service Deliverance Heat pump including controller Installation manual with technical data User manual for controller

2.1 Important safety instructions

In the design and implementation of the heat pump, all relevant EU guidelines have been adhered to. Work on the heat pump may only be performed by trained personnel! Take all necessary precautions in order to avoid accidents while working!

2.1.1 Cooling system – safety instructions

The trained repairman must see to it that parts containing the refrigerant are emptied to a level at which the execution of the work can occur in a responsible manner without any dangers, before the commencement of repairs and service work. When repairing and servicing the heat pump with the refrigerant system opened, and particularly for work with an open ame (soldering, welding, etc.), precau- tions must be taken to prevent res from starting.

2.1.2 Electrical circuit – safety instructions

When working on the heat pump, the main supply must always be disconnected – pull the plug out! When connecting the heat pump to the power supply, the local and national rules and norms must be adhered to. In addition, regard must be paid to possible re- quirements posed by the energy supplier.

2.1.3 Water circuit – safety instructions

Only drinking water quality water may be used. During installation, regard must be paid to the choice of materials and it must be ensured that they can work together without problems in the entire circuit. Special attention must be paid when using galvanized components and components containing aluminum! Safety equipment must be installed to prevent over pressure in the system. All pipe work must comply with water safety regulations.

The heat pump is delivered without water, condense water tube and the safety equipment for the water circuit.46

The heat pump must be stored upright without water and in its packaging.

When carefully transporting the heat pump over short distances, it can be tilted up to 45°C. If this limit is exceeded, the heat pump must stand in its normal up- right position for at least 1 hour before it may be started. Transport and storage may take place at temperatures between -10 and +50 °C. The heat pumps top / casing is not suitable for lifting with and must be carefully avoided during transport.

2.4.1 Transport with forklift

For transport with a forklift, the heat pump must stand on the associated trans- port frame. Always lift it slowly. Due to the high position of the centre of gravity, the heat pump must be secured against tipping during transportation.

2.4.2 Unloading the heat pump

In order to avoid damages, the heat pump must be unloaded on a at surface.

2.4.3 Transport with trolley

The heat pump may only be transported on an associated transport frame. The heat pump must be secured against sliding on the trolley. Water connections, etc., may not be used for transportation purposes. Make sure that the trolley does not damage the cabinet and the connections.

2.5 Placement /set-up

The heat pump may only be installed in a frost-free room. The installation location should comply with the following criteria:

• Room temperature between 0 and +35°C.

• Drain possibility for condensate water.

• No abnormal dust concentration in the air.

• Solid base (approx. 500 kg/m²)

• To achieve problem-free functioning and to allow access for service, it is recommended that 0,5 m free space be maintained around the unit. Set-up sequence:

1. Remove the packaging from the pallet.

2. Remove the transport ttings from the pallet.

3. Take the heat pump off the pallet and place it at the desired

location. Adjust the heat pump vertically by adjusting the feet.47

2.6 Connection of water pipes

During installation the actual pressure and pressure losses must be taken into account regarding pipe dimensions to assure sufcient pressure and water ow rates. The plumbing must be carried out according to regulations. The piping can be made of exible or solid materials. Care must be taken in re- spect to corrosion to avoid damages. As for all pressurerized containers the heat pump must also be equipped with safety and check valves on the supply side. Cold water inlet and hot water outlet is located under the tank (3/4” thread con- nectors). The maximum working pressure is 10 bars, and the maximum working tempera- ture is 65°C. If necessary, the supply pipe must be equipped with a pressure reduction valve and eventually a lter. When installing the pipe work in the house any dirt in the pipes must be avoided. (Eventually ush the pipes with clean water before the heat pump is installed)! When the pipes are connected make sure the pipes are not twisted. Use tools to hold the pipes against twisting! If no recirculation is needed make sure the recirculation connector is closed! Water connection Under the heat pump the connections are located: Condense water drain hose Cold water inlet / Recirculation / Hot water outlet No holes may be drilled. This can damage the winded condenser.

1. Screws to be removed (hexagonal head).

2. Screws to be removed.48

3. Removal of screws.

4. Removal of product :

a: Glide product carefully to one side a bit. b: Bow over to the same side together with 2 pcs. of wood beneath.

5. Carry on with removal :

c: Remove the lower part of the palette while keeping the product in an angle position, still with 2 pcs. wood beneath

6. Product on oor with 2 pcs. of wood.49

7. Removal of 1st piece of wood (can be released if product bowed

8. Removal of 2nd piece of wood (bow the product a bit to another side to

3.1 Water connection

During installation, regard must be paid to the dimensions of the pipes with re- spect to the pre-existing water pressure and the pressure loss in order to ensure sufcient pressure and water ow rates at the draw-off point. The maximum working pressure is 10 bars, and the maximum operating tem- perature is 65°C. If necessary, the supply pipe must be equipped with a pressure reduction valve and possibly a lter. As for all pressure vessels, the heat pumps connections must also be equipped with an approved safety valve on the service side and an approved check valve on the supply side. All pipe work must comply with water safety regulations

3.2 Placement of pipe connections

Hot water outlet is mounted on the upper connecting branch. (¾” RG) If the unit is used with the circulation of the hot water supply, the middle connect- ing branch is used as a return path. (¾” RG) Inlet of fresh cold water is mounted on the bottom connecting branch. (¾” RG) It is recommended to use ¾” ex tube for the connection of the water connection, to avoid possible sound from the vibration. Noholesforttingsorthelikemaybedrilledintheproduct! Such would be able to damage the functionality of the product and cause the product to have to be scrapped!

3.3 Connection of condensation drain

While the heat pump is running, some condensation water will occur, which is conducted to the drain connecting branch (1). The quantity of condensation water depends upon the humid- ity of the air going through the inlet to the heat pump. The condensation connecting branch must be equipped with a hose with a tight air trap, and run to a drain. The air trap must contain a water column of at least 60 mm. It is also possible to use other tight air traps, like a tube with one turn. If mounting of the air trap is omitted, water damage or damage to the heat pump can arise! If the air trap is not correctly mounted, the warranty will not apply!

3.4 Air intake and exhaust

Make sure that there is sufcient free space around the heat pump. Inlet air The inlet air may not be polluted with aggressive components (ammonia, sulphur, chlorine, etc.). Parts in the system may be damaged. Air connectors Inlet and outlet ducts must be made of smooth pipes to minimize pressure losses. Consider the fan working pressure and the duct resistance during installation. (See technical data.) It is advised to install the air ducts that are placed near the heating pump, levelled or with a light fall towards the extract air outlet to avoid leaking of condensed water, easy to cut of. This will avoid leaking of condensed water from the ducts. When air ducts are placed outside the building the back pressure valve (with a small resistance) should be placed to ensure no cold air is entering the room in the winter time and when the heating pump is standing still. Theheatingpumpmayonlybeusedwiththetanklledup! The unit must always be disconnected from the power before the front door is removed. When the unit is disconnected from the power please wait until the fan has stopped before opening the front doors! Before starting up the unit please ensure that all cables and electric plugs are connected correctly and the cable and plug between the display in the door and the circuit board are connected! It is advised to insulate all ducts to lower heat loss and to lower the noise level.

After the installation, it is recommended that the checks be performed to ensure that the connections are sealed and that the drainage of the condensation water is unobstructed.52 The heat pump may only be started with a full water tank! The unit must always be disconnected from the power supply when the front cover is opened! When the unit is disconnected, wait for the fan to stop completely before the cover is opened! Before starting the unit makes sure all connectors are in place, and make sure the cable between display and controller is mounted correctly!

4.1 Demands to the hot water circuit

In the hot water system the following materials may be used: - Copper - Stainless steel - Brass - Plastics Depending on the used materials in the water circuit (in the house) wrong combi- nations of materials may lead to corrosion damages. Special attention is required when using galvanized steel or aluminium materials.

4.2 Starting to use the water circuit

- Fill the tank using the valve on the supply line, and let the air out through one of the upper hot tap water valves until air no longer is present in the tapped water. - Check the entire water circuit for tightness. - Connect the heat pump to the power supply. After starting to use the system the entire water circuit must be checked for tightness.

4.3 Placement into service of the water circuit

Fill the container via the connecting branch, and aerate the tank by letting one of the hot water taps located at the highest elevation within the dwelling stand open until air no longer comes out with the water. The container can normally hold 285 litres of water. Check the entire circuit to be sure it is sealed.

4.4 Electricity – connecting

Connect the heat pump to the public electrical grid.

The cooling circuit is delivered ready to run and no work need be performed on it. The electronic controls automatically take over all functions concerning the operation of the compressor as well as the ventilator. If needed, set the controls to the desired water temperature. The factory setting is 50° C (see the operating instructions for more detailed directions).

4. Placement into service /

4.6 Hints for energy savings

Do not set the water temperature higher than necessary. The best utilization of the heat pump occurs at low water temperatures. The use of circulation will increase the energy consumption of the heat pump signicantly.

4.7 Hints for fan operation

When using ductwork it may be necessary to run the fan on a higher speed to compensate for the pressure losses.

After completing installation it is advised to check all connections etc. to ensure they are tight and to check that condensate water can ow to the drain unrestrict- ed. For servicing, please refer to user manual.54

The AHD 290 comes with a factory setup, which enables an immediate start of the unit. The factory setup is basic and must be adjusted to the operational requirements and demands of the individual home, in order to obtain the optimum operating benet from the unit.

User menu The value of a menu item is shown when pressing the key/key combination below. The value may be changed with the arrows when the key/key combination is held down simultaneously. The control will return to standard indication if no buttons have been pressed for app. 15 seconds. P1: Heat Pump ON/OFF On this button it is possible to change the function between: standby and automatic operation after setpoint P3. (step 0, step 1) Step 0: The heat pump is now off and only the control is active. Step 1: The heat pump is in operation mode and drives after setpoint thermostat P3. P2: Operation for the electrical cartridge The heat pump comes with an extra electrical cartridge for heating of the sanitary hot water. On this button it is possible to turn on the elec- trical cartridge if required. By adjusting the setpoint to 1 the electrical cartridge will turn on after setpoint P5 (operating thermostat for the electrical cartridge). The electrical cartridge is not on if this setpoint it set to 0. Note! When the ambient temperature is under 8°C or over 35°C the electrical cartridge will turn on even if P2 = 0. P3: Operating thermostat for heat pump The required sanitary water temperature may be set between

0 - 55°C, which is heated up by the heat pump.

Factory setting: 52°C Max. water temperature: 55°C P4: Stop defrosting The level and operating thermostat buttons are pressed simultaneous-

As a standard setting, the defrosting period ends when the tempera- ture has reached 10°C. During extraordinary operating conditions, it may be necessary to change this temperature. The temperature may be adjusted between 0-25°C. Factory setting: 10°C +55 P5: Operating thermostat for electrical cartridge The sanitary water temperature may be adjusted between 0 - 65°C. The electric cartridge solely heats the top half of the container, while the heat pump still heats the lower half of the container. Factory setting: 50°C Display indication It is possible to view various temperatures in the display, by pressing the arrows until the required temperature has been shown. After app. 5 seconds, the temperature is shown. The temperature is shown for app. 30 seconds until the display returns to standard. Following tem- peratures may be shown: T4: Extra sensor for free use or forced operating input T5: Pre cooling surface T6: Cooling surface T7: Domestic water top T8: Domestic water bottom T9: Extra sensor

1.2 Altering of the operation data

Usually, the display shows the water temperature. Press (arrow up) and (arrow down) simultaneously for app. 10 seconds in order to enter the operating menu. To show the chosen value press The display will now show the rst point E0 in the operating menu. The operating menu will close and return to the main menu if a button has not been pressed for 15 sec. If you wish to scroll through the operating menu, it may be done by pressing (arrow up) or (arrow down). The value of a point is shown when pressing (temp button). The value may be changed with the (arrow up) or (arrow down) while simultaneously pressing (temp button). The control will return to standard indica- tion if no buttons have been pressed for app. 15 seconds.56

E0: Factory default If the system does not function as expected, even though the set points have been adjusted, and the cause is impossible to locate, it is recommended to note down the settings in the schedule. Thereafter the set point must be adjusted to 1 and wait until the control returns to standard settings. Now all the set points have been changed to the factory default. It is now possible to start all over and adjust the set points. Factory setting: 0 E2: T9 set temperature This sensor is able to control the relay R9, which will be activated when the set- point E2 is reached. The R9 relay can be used to control the three way damper of the exhaust air. This three way damper can supply the living area with cool air, if the room temperature reach the setpoint E2. For this function you will need a separate sensor, which is not a within the standard delivering. The sensor shall be connected to the control panel. For access to the control panel you have to dismantle the top of the machine. E2 can be set between 10-30°C Factory setting: 21°C E8: Disinfection function ON/OFF By setting the point to 1, the electric cartridge will provide 65°C hot water, once a week, in order to disinfect the tank (legionella protection function). Factory setting: 0 E9: Operating in cold surroundings ON/OFF If the setting is 0, the heat pump will run as long as there is a need of heat (= exhaust air-operation). Using the heat pump when taking the admission air from e.g. the cellar, there is an option of making the compressor stop in case the room is getting to cold. Instead, the electric heater will heat the water. The function is activated when the value has been set to 1 (= circulating air-operation). It is also possible to automatically let the electrical heater help heating the water when the intake air temperature is below the temperature set in E10. The function is activated when the value has been set to 2 (= fresh air operation). If the value is 0, the function is not active. Factory setting: 0 E10: Operating in cold surroundings When activating the function menu E9, the temperature at which the compres- sor will stop, or the heater will assist, may be set. The temperature is adjustable between –10 and +10°C. Factory setting: -5 E15: Hygrostat / stop unit If the value is 0, the speed of the fans will change to 3 when the relative humidity is above the preset value of the hygrostat. If the value is 1, the unit will stop when the clips 25 and 26 are short-circuiting. Factory setting: 0 E16: Min. airow This value shows the minimum speed at which the fan is permitted to run when operating. Notice that the cooling system may be overloaded, resulting a drop out of the high-pressure switch, if the value has been set too high. The value should not be chosen higher than necessary, in order to secure a minimal airow through the cooling coil. Adjust this value between 0-100%. Factory setting: 057 E17: Extended airow ON At 3rd speed, there is an option of making the unit step down automatically to the 2nd speed, after a number of hours, by adjusting to set 1. If the setpoint is adjusted to 0, the unit will run at the 3rd speed until a lower speed has been selected manually. Factory setting: 0 E18: Hour If automatic step-down at 3rd speed is in use, the number of hours at which the unit is to operate with forced air, may be adjusted here. The setpoint may be adjusted between 1 - 10 hours. Factory setting: 3 E19: Extra function If the setpoint is 1 the extra function will be activated as soon as T9 reach the setpoint (se E2). If the setpoint is 0, the function will be out of order. E21: TX set In order to avoid high operating pressures in the cooling system, the system out- put must be reduced for the remaining part of the heating period. This parameter indicates the water temperature at which the reduction should start. It may be set to 0-55°C. Factory setting: 50 E23: Tmop This value indicates the maximum permitted evaporation temperature. This pre- vents overloading of the compressor system at high ambient temperatures. Adjust this value between 0-25°C. Factory setting: 25 E25: Vent level 2 If an extended period of extraction from the building is wanted, it is possible to change to level 2. The fan will now run until another level has been selected. This option is used to set the speed at which the fan should run, when level 2 is selected. Please note that this setting also sets the maximum fan speed when running in level 1. The speed may be set to 0-100%. Factory setting: 100 E26: Vent level 3 If extraction from the building at a specic length of time is required, it is possible to change to level 3. The fan will now run for the set period. Thereafter the sys- tem will return to level 2. This menu option is used to specify the speed at which the fans should run when the set period has been chosen. Please note that this setting also sets the maximum fan speed when running in level 1 The speed may be set to 0-100%. Factory setting: 100% E27: Available function. Must at all times be 1. E45: dTair-set Here it is possible to choose minimum cooling of the air, while heating the water. The control will adjust the speed of the fan to make sure the air will be cooled at the exact temperature chosen. In case the control needs to cool the air due to technical reasons, the value will be controlled by the automatic function. When requiring a higher fan speed, the value may be reduced. Remember though, the- fan will run faster, using more energy, if the values are set to low. Factory setting: 158

Use of hot tap water heat pump: The heat pump is only intended to produce hot tap water for domestic use within the specied temperature limits. The sanitary hot water heat pump is a complete unit with a 285 litre hot water tank, extraction fans, heat pump and also equipped with a complete electrical equipment and ve models are equipped with a heating coil. Capacity: The heat pump is capable of producing a hot water volume of app. 1000 Litres at 45°C. The actual volume depends on the supplied fresh water temperature, air temperature and the pattern of use of hot water. The additional electrical heat- ing element (1,5 kW) may be used to boost the capacity whenever needed. The heat pump only uses app. 27% of the energy compared to a conventional electric boiler. Heat pump operation: The control starts the compressor shortly after hot water has been tapped. The compressor will run until the entire tank has been heated to the set temperature again. Usually the heat pump can produce a sufcient amount of hot tap water covering the needs of a common family. Water heating: When hot water is drawn off, the tank will be relled with cold water at the bottom. A sensor measures the temperature at the bottom of the tank and starts the com- pressor if the temperature has fallen 5°C below the set temperature. The com- pressor stops, when the water has been heated to the set temperature. While the compressor operates, the fans run and circulate air through the cooling surface. Fan operation: The fan may be set to run continuously, when the compressor has stopped - by selecting level 2 or level 3. This option may be chosen when the heat pump is used as an extraction system in the residential wet rooms. If the input to T4 short circuits, the control is forced to run at 3rd speed. This may be used in order to achieve more extract in e.g. bathroom, while taking a shower. When breaking the short circuit on the input pins to T4, the control will return to its previous step. Defrosting: When the temperature difference between the temperature upstream of the cool- ing surface and the temperature of the cooling surface becomes too large (as happens when ice is formed on the cooling surface), the unit goes into defrost mode. The magnetic valve MA 4 opens and the supply air fan stops until the ice has melted and the cooling surface has reached a temperature of app. 5°C. Then the magnetic valve closes again and the supply air fan resumes operation.

If a situation should occur where the heat pump is not capable of producing enough hot tap water (more people in the house), an extra electrical cartridge in the container can be switched on. Doing so, it is possible to heat up more water. It is possible to set the desired temperature to which the electrical cartridge should heat up the water. (Only use the electrical cartridge when needed, as it uses more energy than the compressor). The electrical cartridge can be activated manually on the display.

2.3 Operation safety

High-pressure switch: To prevent the compressor from exceeding its range of operation, there is an integral high-pressure switch, which interrupts when the pressure is 20 bar in the cooling unit. Activate the red reset button once the cause of the error has been identied. When the high-pressure switch interrupts, the red LED will ash until the reset button manually or the pressure has fallen to 15 bar or the cause of error has been identied. When the high-pressure switch interrupts, the red light will ash until the reset button on the pressure switch is activated. In order to prevent a repetition of a pressure switch error, the water may be set 2-3°C lower. Safety breaker for electrical heating element If an error occurs at the heater, the safety breaker trips and stops the heater in order to prevent the tank from being overheated. When working on the heat pump, always make sure the power supply is disconnected. Any work on this unit may only be carried out by trained personnel!

High-pressure switch: When the pressure switch trips, the red light on the display will light until the pres- sure switch is reset.61

The following instructions must be followed in order to ensure optimum operation of the heat pump. The power supply to the system must always be switched off before opening the heat pumps cover. When the unit has been installed for the rst time make sure the water connec- tions are checked after a few days to make sure there are no leaks. Also check that the condensate drain pipe is not blocked. Environmental considerations When the unit is being serviced or its operation is cancelled, please make sure to follow the guidelines for recovery and disposal of all materials according to local procedures and laws.

3.1 Cooling system and fan

Fan: Maintaining the fans is mainly periodically cleaning of the evaporator. Disconnect the exible hoses from the top of the unit and unscrew the top plate. Clean the fan with a suitable brush. Do not remove the balancing blocks from the impeller, as this will cause imbalance and with it more noise and fan wear. Riskofinjuryfromsharp-edgedns!Donotdamagethisns! Condensate drain: When changing the lters in the autumn season, check the condensate drain and tray for blockage by dirt. Fill water in the condensate tray and check that the wa- ter runs out unhindered. Should this not be the case the drain must be cleaned. At the same time make sure that the plates of the evaporators are clean.

3.2 Water circuit and tank

Safety valve: The installer has tted a safety valve on the cold water supply pipe for the hot water tank. This valve is a protection of the tank against excess pressure when the domestic water expands during heating. The non-return valve, which is tted before the safety valve on the cold water pipe, prevents the water from ow- ing back into the cold water pipe. This means that the pressure in the tank will increase to the maximum pressure permitted by the safety valve, at which point it will open and allow the surplus water to escape. If the safety valve did not open, the tank would burst. To make sure that the safety valve is working properly, it should be inspected several times a year. To do this, press the spring-loaded arm on the safety valve and see if water comes out of the valve. Damage caused by a blocked safety valve is not covered by the Genvex warranty.62 Anode: In order to prevent corrosion of the enamelled hot water tank, the tank is tted with a magnesium anode with a ¾“ screw plug. This anode has a life expectancy of 2-5 years. It is nevertheless important to check that the anode is intact at all times. This should be done by inspecting the anode every 2 years and replacing it if it is corroded and measures only 6-10 mm in diameter. To inspect the anode, turn off the power supply to the system and remove the front cover. The hot water tank has to be drained before the anode can be unscrewed. To do this, turn off the cold water supply, attach a hose to the drain valve to ensure the water runs to the nearest drain. When draining the water from the tank, turn on a hot water tap to prevent negative pressure in the tank. When the tank is empty, the anode can be unscrewed and inspected. When the anode has been tted again, close the drain cock and turn the valve water supply back on to ll the tank with water. When the tank is full and the cover back on, the power supply can be switched on again.

3.3 Demounting / Putting the unit out of service

The following actions must be taken: Disconnect the power supply from the unit and disconnect other connections. Shut off the fresh water supply valve and connect a drain hose to the drain valve in order to drain the water. While draining, a hot tap water valve should be opened to avoid under pressure in the tank. The air duct connections are uninstalled and remaining air channels must be closed to avoid condense water entrance to the building.63 The heat pump is equipped with the following safety devices:

4.1 High-pressure switch

To prevent the compressor exceeding its range of application, there is an integral high-pressure switch, which interrupts when the pressure becomes too high. In case of interruptions (too high-pressure), the red light in the control panel will ash and the high-pressure switch will stop the heat pump. The red light lights. Restart the equipment by manually resetting the high-pressure switch. For manually resetting the high-pressure switch, the front door can be removed by releasing the screws. For RESET, remove the plastic stopper at the top and press the red button.

4.2 Safety breaker for heating element

The safety breaker protects the equipment against overheating during heating with the electrical heating element. The safety breaker is mounted on the heater. If the adjusted value (90°) is exceeded, the heating coil will disconnect. It can be reconnected when the temperature is below 90°. To do this, the power to the equipment must be off. The reset button can now be pressed. Please notice: Be careful not to damage or tear the cables to the control.

4.3 Heat pump will not run

• the power is connected;

• the power is turned on at the wall plug;

• the water temperature is at the setpoint;

• the temperature of the domestic water is less than 55°C;

• the cable between controller and display is connected. If this does not help locating the error, please contact your local installer or service contractor.

To register your warranty, you should complete and return the enclosed warranty card after which a warranty certicate will be sent to you. This certicate gives the owner of a appliance supplied by A.O. Smith Water Products Company B.V. of Veldhoven, The Netherlands (hereinafter “A.O. Smith”) the right to the warranty set out below, dening the commitments of A.O. Smith to the owner. If within one year of the original installation date of a water heater supplied by A.O. Smith, following verication, and at the sole discretion of A.O. Smith, a section or part (with exclusion of the tank) proves to be defective or fails to function correctly due to manufacturing and/or material de- fects, then A.O. Smith shall repair or replace this section or part. If within 3 years of the original installation date of a water heater supplied by A.O. Smith, following inspection, and at the sole discretion of A.O. Smith, the glass- lined steel tank proves to be leaking due to rust or corrosion occurring on the water side, then A.O. Smith shall offer to replace the defective water heater with an entirely new water heater of equivalent size and quality. The warranty period given on the replacement water heater shall be equal to the remaining warranty period of the original water heater that was supplied. Notwithstanding that stated earlier in this article, in the event that unltered or softened water is used, or allowed to stand in the water heater, the warranty shall be reduced to one year from the original installation date. The warranty set out in article 1 and 2 will apply solely under the following conditions: a. The water heater is installed under strict adherence to A.O. Smith installation instructions for the specic model, and the relevant government and local authority installation and building codes, rules and regulations in force at the time of installation. b. The water heater remains installed at the original site of installation. c. The appliance is exclusively used with drinking water, which at all times can freely circulate (a separately installed heat exchanger is mandatory for heating salt water or corrosive water). d. The tank is safeguarded against harmful scaling and lime buildup by means of periodic maintenance. e. The water temperatures in the heater do not exceed the maximum setting of the thermostats, which form a part of the water heater. f. The water pressure and/or heat load do not exceed the maximum values stated on the water heater rating plate. g. The water heater is installed in a non-corrosive atmosphere or environment. h. The water heater is connected to a protected cold supply arrangement, which is: approved by the relevant authority; with sufcient capacity for this purpose; supplying a pressure no greater than the working pressure stated on the water heater; and where applicable by a likewise approved temperature and pressure relief valve, tted in accordance with installation instructions of A.O. Smith applying to the specic model of water heater, and further in compliance with the government and local authority installation and building codes, rules and regulations.

i. The appliance is at all times tted with cathodic protection. If

sacricial anodes are used for this, these must be replaced and renewed when, and as soon as, they are 60% or more consumed. When electric anodes are used, it is important to ensure that they continue to work properly.