Summary of Contents for Kensa Group Kensa Heat Pumps P250X
- Page 1 Plant Room Heat Pump Copyright ©2019 Kensa Heat Pumps Ltd Plant Room Heat Pump Manual Version 11.1 Page 1 of 34...
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Page 2: Table Of Contents
Contents Page Section Description Page 1....... Introduction .................. 4 2....... Safety Information ................ 5 2.1......Access ........................5 2.2......Lighting ........................5 2.3......Tools and consumables ................... 5 2.4......Handling ........................5 2.5......Residual hazards ...................... 5 2.6......Freezing ........................5 2.7...... - Page 3 Contents Page Section Description Page 5.4.1......To change the heat pump return flow temperatures ..........26 5.4.2......Weather Compensation (Optional)................ 27 6....... Fault finding ................. 30 7....... Warranty..................21 7.1......Terms and Conditions..................... 31 7.1.1......Persons covered by the Warranty................31 7.1.2......
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Page 4: Introduction
1. Introduction—a message from the CEO Kensa Heat Pumps has been manufacturing ground source heat pumps since 1999. In the early days, it was difficult to find contractors willing to consider the technology. As a consequence, Kensa made considerable efforts to simplify the installation process to allow any competent contractor to perform the work. -
Page 5: Safety Information
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. -
Page 6: General Product Information
3. General Product Information This manual explains how to install a Kensa ground source plant room heat pump. The Kensa Plant Room Heat Pump is designed to provide a low cost renewable heat source for a buildings heating system. Heat pumps can provide lower running costs and will generate significantly lower carbon emissions compared with traditional fossil fuels. -
Page 7: Kensa Plant Room Technical Data
Plant Room Heat Pump Manual Version 11.1 Page 7 of 34... -
Page 8: Installation
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. Any electrical work required to install or maintain this appliance should be carried out by a suitably qual- ified electrician in accordance with current IEE regulations. - Page 9 Plant Room Heat Pump Manual Version 11.1 Page 9 of 34...
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Page 10: Plantroom Heating And Cooling Schematics
4.3 Plantroom heating and cooling schematics In many modern commercial buildings, with the improvement in energy saving measures such as insula- tion, the requirement for cooling is now almost as great (if not greater) than the requirement for heating. This cooling requirement is generally being driven by the use of heat emitting devices such as computers and printers and even the staff themselves. - Page 11 Plant Room Heat Pump Manual Version 11.1 Page 11 of 34...
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Page 12: Secondary Boiler Back Up Systems Schematic
4.4 Secondary boiler back up systems (either/or systems) For plant where a secondary back up is required this can be achieved by the use of a plate heat exchanger placed within the flow line. The ideal situation is that either the heat pumps will be providing the full load or the back up boiler i.e. An either or system. -
Page 13: Mechanical Installation
4.5 Mechanical Installation 4.5.1 Locating the heat pump Decide on a suitable location for the Heat Pump. This should be in a plant room which isolates any occupied spaces from the noise and vibration of the heat pumps. It should not be placed near, under, or above, any inhabited space. -
Page 14: Installation Of The Heat Pump
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. -
Page 15: Electrical Installation
Heating only or Heating and Cooling Plumbing Cooling only Plumbing connections connections (viewed from above) (viewed from above) Chilled water in Return Return from the from Ground In heating distribution ground Flow to the heating Ground Out Flow to distribution ground Chilled water out Flange sizes are DN40 PN10/16. -
Page 16: Three Phase Power Supplies
Fig 9 Electrics box with the Controller front removed Ground pump Compressor relay MCBs Controller 4mA Wiring Terminals Cables should enter the unit from below using the cable entry ports provided. An external isolation switch should be wired into the circuit to provide local isolation of the electrical supply as required. The following sections detail the standard wiring connections. - Page 17 It is also important that there is an interlock on the ground pump flow linked to the run signal for the heat pump, particularly if the control of the unit is via a BMS system. There are two common types of control to interlock the run enable signal to the ground pump flow:- •...
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Page 18: Setting To Work
5. Setting to Work After all mechanical and electrical work has been completed, the following 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 including the head- er pipework. - Page 19 Plant Room Heat Pump Manual Version 11.1 Page 19 of 34...
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Page 20: Purging The Headers
5.1.2 Purging the headers Once the ground arrays have been purged of air it is important that the header pipe is also purged. This should be done by connecting the purge points together on each array manifold in turn using suitable pipe to create a loop. -
Page 21: Pressure Testing In Accordance To Bs805 Section 11.3.3.4
5.1.4 Pressure Testing in accordance to BS805 Section 11.3.3.4 In accordance with MCS Guidelines, leak tightness (pressure) testing has to follow the EN 805 prescriptions in section 11.3.3.4. This test should be carried out after the ground arrays have been purged but before the antifreeze is added. -
Page 22: Testing Of Antifreeze Concentration
• 20 mins. Second pressure measurement • 30 mins. Third and final pressure measurement Fig 14 Graphical Test Procedure The ground array has passed the test if the pressure difference (pressure drop) between (6)C and (6)A does not exceed 0.1 bar. The test should not be conducted in cold weather, when there is a risk of freezing. -
Page 23: Heating Distribution And Load Side Purging
Ground side Heating Schrader valve distribution Schrader valve Fig 15 Location of heat pump schrader valves (Bleed Points) 5.1.6 Heating distribution and load side purging 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 Heat pump. -
Page 24: Heat Pump Operation
5.2 Heat pump operation Prior to use: - Turn off the power supply at the local isolator Remove the door by turning the lock with a screwdriver, opening and lifting off. iii. Check that the ground pressure gauge reads at least 1.8 bar. If the pressure is lower than this, increase the pressure until the gauge reads at least 1.8 bar, at which point a “click”... -
Page 25: Altering The Flow Temperature From The Heat Pump
5.4 Altering the flow temperature from the heat pump Each heat pump has a dedicated control unit which can be interrogated to view various parameters, alter the heat pump outlet flow temperature and indicate faults/alarms. 2.Heating 3.Compressor symbol number 2.Cooling symbol 3.Compressor run symbol... -
Page 26: To Change The Heat Pump Return Flow Temperatures
A flashing error code may appear if there is a fault with the heat pump, the most common will be: - Alarm Description Low water pressure (ground or heating distribution) High gas pressure caused by low or no flow on the heating distribution circuit. Low gas pressure fault (can occur temporarily on first start up). -
Page 27: Weather Compensation (Optional)
It is advised that any settings that are changed are noted within Section 8 ‘Heat Pump Settings Sheet’ page 5.4.2 Weather Compensation (Optional) All Kensa 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 weath- er, which allows the heat pump to run more efficiently. - Page 28 Kensa strongly suggest that the heatpump should be run for at least one week after commissioning, before the weather compensation (WC) is activated. This is because WC introduces an additional set of variables, which can complicate and confuse the commissioning process.
- Page 29 To enable weather compensation Steps Action Display Unplug pressure transducer from the internal Carel controller Plug weather compensation plug into internal Carel controller Press and hold SET (or PRG & SEL together on the internal controller) and release when 0 is displayed Press and hold the up button, and release when 66 is displayed Press SEL "S-P"...
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Page 30: Fault Finding
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. Symptom Possible Cause Action Blank display on software controller No power supply Check wall mounted electrical isolator switch... -
Page 31: Warranty
7.0 Warranty The Kensa Planroom Ground Source heat pump is designed and built to the highest standard and as such is guaranteed for 5 years for parts from the date of commissioning or 5 ½ years from the date of manufacture (excluding the electrical components), whichever is shorter. -
Page 32: Care Of Duty
-products operated in connection with any liquid source that contains impurities which are corrosive to copper -products operated in a temperature range inconsistent with Kensa Heat Pumps Ltd’s published or written recommendations 7.1.5 Care of Duty The product must be handled with normal care and attention to minimise the risk of damage or loss. 7.1.6 In the event of Damage The installing contractor (“Contractor”),or, if the installing Contractor is not available, Kensa Heat Pumps Ltd must be notified of any damage immediately and no later than six months after you first became... - Page 33 This page is left intentionally blank Plant Room Heat Pump Manual Version 11.1 Page 33 of 34...
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Page 34: Heat Pump Settings Sheet
8. Heat Pump Settings Sheet Type of ground arrays Ground Arrays purged Ground arrays leak tested to BS805 Antifreeze quantity & concentration Serial Number Visual Inspection Feet level on floor Visual check of site wiring Software operating Software errors Heating Status Ground water pressure Heating system water pressure Control philosophy...
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