MAINTENANCE INSTRUCTIONS. Thermia Robust heat pump

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1 MAINTENANCE INSTRUCTIONS Thermia Robust heat pump R e v. 3

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3 Table of contents 1 Important information Product description General The principles of the heat pump Safety precautions Installing and adjusting the heat pump Modifications which affect the heat pump Protective precautions Corrosion Protection Checking the pressure in the heating system Filling the heat transfer fluid circuit Checking the refrigerant pressure Leakage Checks before operation Opening the shut off valves Checking the water pressure and water level in the heating system Checking the coolant Control panel Start and stop Starting the heat pump Switching off the heat pump Setting the room temperature desired values (desired temperature) Fault-tracing Installation maintenance Causes of alarms Resetting the alarm Reference Thermia Värme AB retains the right to make changes to components and specification without prior notice. Symbol for safety precautions, which must be observed. Failure to follow these precautions can cause danger to life or risk of damage to the installation and its components. 1

4 1 Important information If the installation is not used during a period when there is a risk of freezing, the internal components should be drained. Also see MAINTENANCE CHECKS. The installation should be considered maintenance free although some attention is required. See MAINTENANCE CHECKS. 1.2 General Thermia heat pumps can be run using energy from many different heat sources, for example rock heat, ground heat etc. Contact your installer for any service work. 1.1 Product description Thermia Robust is a heating unit for both heating and hot water with the possibility of comfort cooling, within the power range kw. Thermia Robust is equipped with an alarm card which allows the option of connecting external control. All models of Robust can be equipped with soft start as additional equipment. All models are equipped as standard with a cooler for greater efficiency and a de-superheater for higher tap water temperature. The cooler can easily be disconnected from the heating system return in order to use it for snow melting, pre-heating hot water etc. The heat radiation to the house is via a water borne system. 2

5 2 The principles of the heat pump The heat pump system consists of three different circuits, which function together through heat transfer: Coolant circuit (brine circuit), through which energy from the heat source is transferred to the refrigerant circuit. 3/4 Solar energy 1/4 Electrical energy 4/4 Heater energy Refrigerant circuit, which through evaporation, compression and condensing, gives heat to the hot water circuit. The heat transfer fluid circuit, which transports the heat to the heating system and the hot water to the hot water tank. Fig 1. Using rock heat as a heat source 3

6 The refrigerant circuit compressor (1) draws the refrigerant from the evaporator (2). The refrigerant pressure drops. The refrigerant begins to evaporate and turns to gas. The heat required for evaporation is supplied by the coolant circuit (i.e. the heat source) and passes to the evaporator by heat transfer. The gaseous refrigerant is then compressed in the compressor, where the temperature of the refrigerant rises. The high temperature gas passes the de-super heater which transfers the heat at a high temperature to a final heater. The gaseous refrigerant is transported on to the condenser (3), where it gives its heat to the heat transfer fluid circuit. Because the heat is given off in the condenser, the temperature of the refrigerant falls and it returns to the liquid state. The cooler lowers the temperature of the liquid refrigerant further and the heat is given off either to the heating system return pipe or an external water system. The energy given off in the 4 cooler does not cost extra in the form of drive energy for the compressor. The refrigerant passes the expansion valve (4), where the pressure falls and is then lead on to return to the evaporator. The circuit is complete and a new one commences. Heating system Expansion valve Coolant pump 3 Condenser Evaporator 2 Heat transfer fluid pump Additional heater (accessory) Compressor 1 Heat transfer fluid circuit Refrigerant circuit Coolant circuit Heat source Fig 2. Heat pump function 4

7 3 Safety precautions 3.1 Installing and adjusting the heat pump Installation and adjustment of the heat pump and maintenance and repair work must only be carried out by an authorised installer. Modifications for the electrical installation must only be carried by an authorised electrician. Danger to life! Work on the refrigerant circuit must only be carried out by authorised refrigeration technicians. 3.2 Modifications which affect the heat pump No modifications may be made to the following components: The heat pump unit. The pipes for the refrigerant, coolant, water and power. The safety valve. Construction installations which may affect the operational safety of the heat pump. 5

8 4 Protective precautions 4.1 Corrosion Protection Avoid the use of any type of spray, solvent, chlorine rich cleaning agent, paint, adhesive etc. near the heat pump. These substances can cause corrosion damage. 4.2 Checking the pressure in the heating system Check the pressure in the heat transfer fluid circuit regularly. 4.3 Filling the heat transfer fluid circuit Filling and topping up the heating system should be carried out by an authorized installer. Normal tap water can usually be used when filling the heating system. In certain exceptional cases the water quality may be so poor (for example very hard water) that it is not suitable to fill the heating system. Do not use any additives for water treatment! 4.4 Checking the refrigerant pressure Once a month use the manometer to check that the pressure in the installation has not dropped. See the manufacturer s maintenance instructions for the manometer and safety valve. (See fig 3) 4.5 Leakage If any leakage occurs in the heating system, the unit must be immediately closed and the valves in the heating system closed. Then contact the installer to repair the leakage. In the event of leakage in the refrigerant circuit the alarm message Alarm LP is displayed. Switch off the heat pump and call an authorised technician for repairs. Fig 3. Checking the coolant system pressure. 6

9 5 Checks before operation 5.1 Opening the shut off valves Check that the external shut off valves in the heating system supply and return pipes are open. 5.2 Checking the water pressure and water level in the heating system The heating system must be filled with water before the installation is first operated. Check the system pressure of the external manometer and ensure that the installation is filled and bled. 5.3 Checking the coolant The coolant circuit must be filled with the correct amount of coolant before the installation is first operated. Otherwise the installation can be damaged. Check the pressure in the expansion vessel. When the heat pump (coolant pump) is not active it must be possible to read off over pressure on the coolant circuit expansion vessel. Call an authorised installer to fill the coolant. Call an authorised installer to fill the heating system. 7

10 6 Control panel 1 Voltage supply Lit: The heat pump has operating voltage. Extinguished: The heat pump does not have operating voltage. 2 Alarm indication Lit: Alarm because high pressure switch has tripped. Extinguished: No alarm. I 0 R 3 Alarm indication Lit: Alarm because low pressure switch has tripped. Extinguished: No alarm. 4 Alarm indication Lit: Alarm because motor protection for the compressor or coolant pump has deployed. Flashing: No flow in coolant circuit (requires the flow sensor to be connected. Extinguished: No alarm. 5 Reset button to reset the alarm. 6 Button marked O = OFF 7 Button marked I = ON Fig 4. Control panel 7 I 0 6 R 5 HP LP

11 I 0 R 6.1 Start and stop Starting the heat pump The main switch must only be switched on when one is satisfied that: the heating system is filled with water. the coolant circuit is filled with coolant. all systems have been bled. 1 all systems have been cleaned. all necessary valves have been opened. I 0 R Press the button marked I (1 ) to start the heat pump Switching off the heat pump Press the button marked O (2 ) to switch off the heat pump. I 0 2 R Setting the room temperature desired values (desired temperature) Fig 6. Starting the heat pump Read through the control computer s instruction manual. Fig 5. Switching off the heat pump 9

12 I 0 R 7 Fault-tracing The heat pump is equipped with the following protective functions: High pressure switch (HP), which prevents the compressor working with too high condensing pressure. Low pressure switch (LP), which prevents the compressor working with too low evaporative pressure. Motor protection (MS) which protects the compressor from over voltage. Motor protection (MS) which protects the coolant pump from over voltage. If any of the above protective functions deploy, the LEDs light up (1, 2 or 3). LED 3 may also flash, see below for alarm messages on the control panel. The following faults could be the cause: 1 : interference because high pressure switch has tripped. In the event of interrupted operation, try to restart the heat pump using the reset button R (4) (see fig 7). If the fault is not corrected by pressing the reset button, recall the installer. The following fault-tracing diagram gives possible causes of operational stoppages. 7.1 Installation maintenance Maintenance instructions for prevention of refrigerant release. The installation owner/ user should check the installation regularly to prevent the release of refrigerant. Example: Oil leakage, odour and vibrations. When a fault is discovered contact a service-/installation company. 2 : interference because the low pressure switch has tripped. 3 : interference because motor protection for the compressor or coolant pump has deployed. 3 : Flashing light means that there is no flow at the flow sensor. (Applies to ground water installations) Fig 7. Fault-tracing I 0 R 4 HP LP

13 7.2 Causes of alarms Low pressure: fixed light Poor flow through the coolant system (heat source) that may be caused by insufficient coolant or blocked strainer (contact your installer) or air in the system (contact your installer). Alarms may also be caused by a defective coolant pump or an incorrect mixture ratio in the coolants. High pressure: fixed light Poor flow through the heating system that may be caused by closed or poorly opened radiator /floor loop thermostats, blocked strainer (contact your installer) or air in the heating system (top up and bleed the heating system). The alarm may also be caused by a defective circulation pump. Motor protection: fixed light Flow sensor: Flashing light If a power failure has occurred or a fuse has blown, this may cause operational interruptions, check fuses. Lower flow than set alarm limit in the flow selector. Check the pump and filter. 7.3 Resetting the alarm The alarm is reset by pressing the reset button (R). If the fault is not corrected by pressing the reset button, recall the installer. 11

14 8 Reference As user please ensure that the installer fills in the following information to facilitate servicing. PIPE INSTALLATION Date Company Name Tel. No ELECTRICAL INSTALLATION Date Company Name Tel. No SYSTEM ADJUSTMENT Date Company Name Tel. No

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16 If these instructions are not followed during installation, operation and maintenance, Thermia Värme AB s liability according to the applicable warranty is not binding. Thermia Värme AB Box 950, Arvika, Tel set communication

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