Thernamic GS Single Compressor Compact Heat Pump Installation & Commissioning PLEASE RETAIN THESE INSTRUCTIONS WITH THE PRODUCT.
Contents Page Section Description Page 4 1....................... Notes sheet .................................................................................. 2....................... Safety Information ........................................................................ 5 2.1........................... Access ...................................................................................................................... 5 2.2........................... Lighting .......................
Contents Page Section Description Page 5....................... Commissioning ............................................................................. 22 5.1........................... Purging the slinkies of air ....................................................................................... 22 5.1.1........................ Purging procedure for multiple slinkies ................................................................. 22 5.1.2........................
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2. Safety information Safe operation of this unit can only be guaranteed if it is properly installed and commissioned in compliance with the manufacturer’s requirements. General installation and safety instructions for pipeline and plant construction, as well as the proper use of tools and safety equipment must also be complied with. Manufacturer:Vent-Axia Limited Fleming way Crawley, West Sussex, RH10 9YX Tel 01293 441523 www.vent-axia.
3. General Product Information This manual explains how to install and commission a Vent-Axia ground source heat pump. The Vent-Axia Compact Single Compressor Heat Pump is designed to provide a low cost renewable heat source for a buildings heating system. In addition, and if required, the Vent-Axia Compact can also provide domestic hot water. Heat pumps can provide lower running costs and will generate significantly lower carbon emissions compared with traditional fossil fuels.
16 12 12 9.4 8.0 7.2 5.7 30 26 22 18 15 Amps Max running Current 7 (9) 6 (7) 5 (6) 4.5 (5) 3 (4) 17 (22) 13 (18) 13 (16) 10 (12) 7 (10) Amps Typical running current 51 41 36 30 23 40 30 30 30 25 Amps Typical starting current 2.5 2.5 2.5 2.5 2.5 4.0 4.0 2.5 2.5 2.5 mm kW Power input* Kg 110 100 95 90 85 3.2 (4.5) 2.6 (3.7) 2.3 (3.2) 1.8 (2.4) 1.4 (2.0) 110 100 95 90 85 Three Phase— 400 Volts AC 50 Hz 3.4 (4.6) 2.7 (3.8) 2.4 (3.3) 1.
4. Installation Note: Before actioning any installation observe the 'Safety information' in Section 1. It is essential that the following installation guidelines are followed carefully.
4.2.1 Underfloor with a single manifold. Space heating only Fig 2 Heat Pump with Underfloor and a Single Manifold Schematic Vent-Axia Supply 4.2.2 Underfloor with a multiple manifolds.
4.3 Radiators. Space heating only The following section includes typical schematics of how a heat pump can be connected. Only the load side is shown i.e. the heating distribution system. It is important to note that the schematics are only general arrangements and hence do not illustrate all required valves or fittings. They are only a guide and should not be used as full installation plans. When operated with radiators to avoid short circulating problems, one bypass radiator should be left ‘open’, i.e.
programmed to operate for a period immediately following the DHW production. This means that the majority of the heating load for the DHW is produced at a lower cost using the heat pump, as opposed to using only the direct immersion heater. If 50oC water is acceptable, then it is recommended that the immersion heater is programmed to raise the temperature to 65oC once a week. 4.4.
Vent-Axia Supply Fig 5 Underfloor with a single manifold and DHW Schematic Vent-Axia Supply Fig 6 Underfloor with multiple manifolds and DHW Schematic Note: Additional circulation pumps with multiple manifolds depends on the system design.
DHW Tank Hot water out to faucets Cold feed in 7 day time clock dedicated controlled by Immersion heater pipe NOT COPPER be plastic pipes must vibration, Because of arrays up ground in to top B 3 Port Diverter Valve 15 mm arrays up ground in to top cold feed Heat Pump, Space Heating & DHW Schematic Byelaw 14 kit Loop Removable Filling A See separate underfloor heating wiring diagrams for further detailed information cold feed DHW TimeClock Byelaw 14 kit 15 mm Loop Fig 7
4.5 Mechanical Installation 4.5.1 Locating the Heat Pump Decide on a suitable location for the Heat Pump. This should ideally be in the back of a domestic garage, or a utility room. It should not be placed in any inhabited space or near any noise sensitive areas. The Compact emits limited noise and vibration, and should not be placed adjacent to, or below bedrooms or occupied spaces. Take into account the “Recommended Clearances” when finalising the location. Check the appliance for transport damage.
4.5.3 Installation of the heat pump Ideally the heat pump should be placed next to an external wall allowing easy access to the externally mounted ground array manifold. Any pipes internal to the building must be insulated with vapour barrier insulation such as Armaflex. It is not recommended that the ground array manifold is installed within a building due to condensation and difficulty in lagging the manifold to overcome this.
i. ii. iii. iv. v. vi. Unscrew the 4 x 5mm hex-socket screws, 2 on either side of the front panel. Remove the front panel. Remove all three lower closure panels necessary to gain access to the pipe connections, by un screwing the 4 x hex-socket screws on each panel. Position the appliance on a firm, level and substantial concrete base that will absorb vibration and ensure the unit is well away from any occupied rooms.
4.6 Electrical Installation The Vent-Axia Compact heat pump range is available in either single or three phase power supply versions. Any electrical work required to install or maintain this appliance should be carried out by a suitably qualified electrician in accordance with current IEE regulations To access the wiring terminals :i. remove the heat pump front cover by unscrewing the 2 x 5mm hex socket screws on each side of the heat pump. ii.
In all wiring diagrams the terminals marked ‘Reverse Cycle’ change the mode from heating to cooling (If this option is fitted). This requires a volt free relay, open is heating mode, closed cooling. The terminals marked ‘Fault’ are to provide remote indication that a fault has occurred within the heat pump. This is a volt free relay and the internal relay will close if a fault occurs. 4.6.1 Single Phase 4.6.1.1 Single Underfloor Control Unit Thermostat inputs.
4.6.1.2 Multiple Underfloor Control Units Thermostat inputs. Refer to Manufacturers Literature Thermostat inputs. Refer to Manufacturers Literature Underfloor Electric Actuator Output Refer to Manufacturers Literature Boiler Relay 230 Vac 50Hz power supply via a Type D MCB in the buildings distribution Board DHW time clock Boiler Relay DHW valve Fault Reverse cycle Enable Signal link removed Heat Pump Wiring Terminal block Fig 15 Heat Pump Wiring—Multiple Underfloor Control Units 4.6.1.
4.6.2 Three Phase Power Supplies Enable Signal DHW time clock DHW valve Fault Reverse cycle 400Vac 50Hz Power Supply Fig 17 Heat pump Wiring—Three Phase Power Supplies Heat Pump Wiring Terminal block 4.6.3 DHW time clock and 3 way diverting valve wiring To/From Heating Control System i.e.
4.6.3 Weather Compensation (Optional) All Vent-Axia Compact Heat Pumps are supplied with Weather Compensation as standard. This facility will reduce the return water set-point against a schedule of external ambient temperatures. In more simple terms, the temperature of water flowing into the building’s radiators or underfloor heating is reduced in mild weather, which allows the heat pump to run more efficiently. This is particularly important with radiators, as much higher temperatures are required.
5. Commissioning After all mechanical and electrical work has been completed, the following commissioning instructions should be followed. 5.1 Purging the ground array of air. It is important for correct operation that all the air is removed from the ground arrays. Slinkies consist of a large number of 1 metre diameter loops of 32mm OD pipe and air can collect at the top of these loops. Even vertical (ie. drilled) arrays can have trapped air and should be purged.
Pump priming port Clarke Purge Pump 80 litre dustbin Fig 21 Slinky purging kit connected to a manifold Optional Expansion Vessel V1 Vent-Axia Supply flow iii. Fig 22 Slinky manifold connections Place a filter such as a kitchen sieve over the pipe returning water to the dustbin so any debris will be captured. Ensure all valves are closed including the heat pump valve V1. Open the valves on the manifold in the following order (refer to above diagram Fig 22) :a. b. c. iv.
should be flowing through the heat pump or through the other slinkies. The flow rate should be in excess of 30 litres per minute. This can be checked simply by holding a 10 litre bucket to collect water returning from the slinky, and ensuring that it fills in less than 20 seconds. If the flow is less than this, sufficient velocity is not being achieved to displace the air at the tops of the slinky coils. Fig 23 Purging the Slinkies of Air v. vi. vii. viii.
iv. v. vi. vii. Open the valve V1 to the heat pump and start the purge pump to circulate the antifreeze around the system. Leave the pump running until antifreeze is seen returning to the dustbin. The amount of time this will take depends upon the length of the header pipe. Close the valve to the heat pump and turn the purge pump off. Open the first slinky flow and return valve and with the return pipe inside of the dustbin start the purge pump. Once the return discharge runs clear, i.e.
The sequence of valve operation for a single manifold is slightly different from larger manifolds. Each slinky is connected to a three port diverting valve as above. The slots machined on the front of each valve indicate which connection is open. The previous drawing (Fig 25) is set for normal operation, i.e. both purge connections are closed and the flow and return from the slinky to the heat pump are open. i. ii. iii.
vi. When all the air has been removed reduce the level of water in the bin to 200-250mm by removing fresh water from the system (via the pump discharge pipe). Do not uncover the suction pipe. Add 1 drum of antifreeze to dustbin and using pump circulate around heat pump. vii. Move the valves to the position below Both purge connections are now open to slinky. viii ix. x. xi. xii. xiii. xiv.
5.1 .5 Heating distribution and load side purging i. ii. iii. iv. Find the cold fill for the heating system and open the valve on the heating system to allow water into the heating system and the Compact. Follow the manufacturer’s procedures for purging the heating system. For any systems that involves cooling, antifreeze (approximately 20%) must be added to the distribution load side.
5.2 Heat Pump Operation Prior to use: i. Turn off the power supply at the local isolator ii. Unscrew the 4 x 5mm hex socket screws on either side of the front panel (2 each side). Remove the front panel. iii. Check that the ground pressure gauge reads at least 0.3 bar. If the pressure is lower than this, open the mains cold water supply valve (fitted outside the case) fully until the gauge reads at least 1.8 bar, at which point a “click” will be heard. Close the mains cold water supply valve fully. iv.
5.4 Altering the flow temperature from the heat pump Each heat pump has a dedicated display which can be interrogated to view various parameters, alter the heat pump outlet flow temperature and indicate faults/alarms. 2.Heating symbol 3.Compressor number 1. Floor return temperature 3.Compressor run symbol 2.Cooling symbol n.b. the numbers above refer to the points below. Fig 30 Heat Pump Display The display normally reads the temperature of the water returning from the heating distribution system.
Compressor running A flashing error code may appear if there is a fault with the heat pump, the most common will be: Alarm Description TP Low water pressure (ground or heating distribution) HP High gas pressure caused by low or no flow on the heating distribution circuit. LP Low gas pressure fault (can occur temporarily on first start up). Call Vent-Axia Technical Department.
30oC the actual flow temperature out of the heat pump is approximately 35oC. The outlet flow temperature of the heat pump determines the efficiency of the heat pump. For underfloor systems mounted in screed a flow temperature of 35oC is generally suitable, therefore the return temperature should be set at 30oC. However for joisted systems or systems with insulative floor coverings then a higher flow temperature may be required and hence the return flow temperature set point may need to be increased.
6. Fault Finding Many faults which occur on commissioning are found to be due to incorrect wiring or setting up, therefore it is recommended that a thorough check is carried out should there be a problem.
7. RTB and Extended Warranty Statement All Vent-Axia heat pumps have a two year RTB (Return To Base) warranty as standard. The warranty runs from the date of delivery of the heat pump. RTB means that if a product is thought to be defective, then it is returned to the manufacturer, with carriage paid by the customer. The manufacturer then examines the product. If no fault is found, then the customer pays the return carriage.
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The Guarantee Applicable only to products installed and used in the United Kingdom. For details of guarantee outside the United Kingdom contact your local supplier. Vent-Axia guarantees its products for two years from date of purchase against faulty material or workmanship.
