Gledhill PulsaCoil 2000 Design Installation and Servicing Instructions

Gledhill PulsaCoil 2000 Design Installation and Servicing Instructions


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And SparesGledhill-PulsaCoil-2000-design-installation-and-serivcing-instructions-1



Gas Council Approved Reference Numbers

PulsaCoil 145 97-317-32
PulsaCoil 185 97-317-33
PulsaCoil 215 97-317-34
PulsaCoil 235 97-317-35







Section Details
1.1 Introduction
1.2 Technical Data
1.3 System Details
2.1 Site Requirements
2.2 Installation
2.3 Commissioning
3.1 Annual Servicing
3.2 Changing Components
3.3 Short Parts List
3.4 Fault Finding
Appendix A
Appendix B
Appendix C
Appendix D
Terms & Conditions


Gledhill-PulsaCoil-2000-design-installation-and-serivcing-instructions-2The code of practice for the installation,
commissioning & servicing of central heating systems


As part of the industry wide “Benchmark” Initiative all Gledhill PulsaCoils now include a Benchmark Installation, Commissioning and Service Record Log Book. Please read carefully and complete all sections relevant to the appliance installation. The details of the Log Book will be required in the event of any warranty work being required. There is also a section to be completed after each regular service visit. The completed Log Book and these instructions should be left in the pocket provided on the back of the front panel.

The Gledhill PulsaCoil range is a WBS listed product and complies with the WMA Specification for hot water only thermal storage products. The principle was developed originally in conjunction with British Gas. This product is manufactured under an ISO 9001:2000 Quality System audited by BSI.

The Gledhill Group’s first priority is to give a high quality service to our customers.

Quality is built into every Gledhill product and we hope you get satisfactory service from Gledhill.

If not please let us know.





For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares


Any water distribution system/installation must comply with the relevant recommendations of the current version of the Regulations and British Standards listed below:-

Building Regulations
Requirements for Electrical Installations
Water Regulations
Manual Handling Operations Regulations

British Standards
BS6700 and BS7671.

A competent person must install the PulsaCoil domestic hot water system. The manufacturer’s notes must not be taken as overriding statutory obligations.

The PulsaCoil 2000 is not covered by section G3 of the current Building Regulations and is therefore not notifiable to Building Control.

The information in this manual is provided to assist generally in the selection of equipment. The responsibility for the selection and specification of the equipment must however remain that of the customer and any Designers or Consultants concerned with the design and installation.

Please Note: We do not therefore accept any responsibility for matters of design, selection or specification or for the effectiveness of an installation containing one of our products unless we have been specifically requested to do so.

All goods are sold subject to our Conditions of Sale, which are set out at the rear of this manual.

In the interest of continuously improving the PulsaCoil range, Gledhill Water Storage Ltd reserve the right to modify the product without notice, and in these circumstances this document, which is accurate at the time of printing, should be disregarded. It will however be updated as soon as possible after the change has occurred.


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares


The PulsaCoil 2000 shown schematically above is designed to provide an improved method of supplying mains pressure hot water when used with a suitable off peak electric supply/tariff.

Because of the efficiency of the appliance improved SAP ratings can be achieved. Further details are available from the Gledhill Technical Department.

An important feature of the concept is that hot water can be supplied directly from the mains at conventional flow rates without the need for temperature and pressure relief safety valves or expansion vessels. This is achieved by passing the mains water through a plate heat exchanger. The outlet temperature of the domestic hot water is maintained by the Pump Speed Control (P.S.C.) board, which controls the speed of the pump circulating the primary water from the store through the plate heat exchanger.

To comply with the Benchmark Guidance Note for Water Treatment in heating and hot water systems the installer should check the hardness levels of the water supply and if necessary fi t an in-line scale inhibitor/reducer to provide protection to the whole of the domestic water system.

If scale should ever become a problem the plate heat exchanger is easily isolated and quickly replaced with a service exchange unit which can be obtained at a nominal cost from Gledhill. For further details see Hot and Cold Water Systems, page 9.

The PSC incorporates the facility to automatically run the D.H.W. primary pump for about 3 seconds every 30 hours to help prevent it sticking. For this reason we would recommend that once the appliance is installed it should be commissioned and the electricity left on to the appliance.

* Note: The standard appliance is supplied as a manual fill model i.e. without a ballvalve and overflow which makes it particularly suitable for use in flats/apartments. A ballvalve and overflow fitting can be supplied as an optional extra if required.



Dwelling Type
Bedroom  1-2 2-3 2-3 2-4
Bathrooms 1 1 1 2
En-Suite shower rooms 1 1 2  1
Standard Economy 7 tariff PC145 PC185 PC215 PC235
Economy 10 or Heatwise tariff PC145 PC145 PC145 PC185



1. Plastic feed and expansion cistern will be supplied separately.
2. The flow rates are based on a 35°C temperature rise and assume normal pressure and adequate flow to the appliance. The actual flow rate from the appliance is automatically regulated to a maximum of 28 litres/min.
3. Unit is supplied on a 100mm high installation base.
4. The domestic hot water outlet temperature is automatically regulated to approximately 55°C at the bath flow rate of 18 litres/min recommended by BS 6700. The temperature is not user adjustable.


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares



Standard Equipment

The standard configuration of the PulsaCoil 2000 is shown opposite. The Pump Speed Control Board (P.S.C.), mounted inside the appliance, controls the operation of the complete system. The P.S.C. is prewired to a terminal strip where all electrical connections terminate. It is supplied with the following factory fitted equipment:-

1. 3kW off-peak immersion heater with control and overheat rod thermostat
2. 3kW on-peak boost immersion heater with control and overheat rod thermostat
3. Pump Speed Control Board (P.S.C.)
4. Plate heat exchanger
5. Domestic hot water primary (plate heat exchanger) pump
6. Isolating terminal connectors for dry fi re protection
7. DHW temperature sensor
8. PHE return sensor
9. Strainer and flow regulator
10. Screwed connection for a drain tap
11. A feed and expansion cistern complete with cold feed/open vent pipework assembly is supplied separately.

Note :
Both immersion heaters are low watts density type with incaloy 825 sheaths and are specially manufactured to suit Thermal Stores. It is recommended that any replacements should be obtained from Gledhill Water Storage.

Optional Extra Equipment
• Flexible connectors for quick connection to firstfi x pipe installation. For further details see 2.2 Installation, Pipework connections.
• Hot and cold water manifolds for use with plastic pipework.
• Ballvalve/overflow connector for F & E cistern




Model Height Width   Depth
Model A B C
PC 145 1140mm 595mm 575mm
PC 185 1360mm 595mm 575mm
PC 215 1500mm 595mm 575mm
PC 235 1700mm 595mm 575mm

The Appliance dimensions above do not allow for the100mm high installation base

The following table of minimum cupboard dimensions only allow the minimum space required for the appliance (including the F & E cistern). Any extra space required for shelving etc in the case of airing cupboards etc must be added.


Model Height Width   Depth
Model D E F
PC 145 1890mm 700mm 600mm
PC 185 2110mm 700mm 600mm
PC 215 2250mm 700mm 600mm
PC 235 2450mm 700mm 600mm

Note: The above dimensions are based on the Appliance and the F & E cistern (fitted with a ballvalve) being in the same cupboard. If the manual fi ll method is chosen the heights can be reduced by 125mm.


The PulsaCoil 2000 units are supplied on an installation base to allow the pipe runs to connect to the appliance from any direction. It is easier if all pipes protrude vertically in the cut out area shown. Compression or push fit connections can be used and we do offer a set of flexible connectors as an option. All pipe positions are approximate and subject to a tolerance of +/- 10mm in any direction. Space will also be required for a 15mm cold water supply and a 22mm warning / overflow pipe (if provided) for the separate feed and expansion cistern.

If a warning/overflow pipe is NOT provided the F&E Cistern should be filled from a temporary hose connection incorporating a double check valve. This can be from a temporary hose connection supplied from a cold water tap or a permanent cold branch provided adjacent to the F&E Cistern. The temporary connection must be removed once the appliance is filled.


Hot and Cold Water System

A schematic layout of the hot and cold water services in a typical small dwelling is shown below. PulsaCoil 2000 will operate at mains pressures as low as 1 bar and as high as 5 bar although the recommended range is 2-3 bar dynamic at the appliance. If the manifolds (available as an optional extra) are being used the inlet pressure to the manifold must be a minimum of 2 bar. It is also important to check that all other equipment and components in the hot and cold water system are capable of accepting the mains pressure available to the property. If the mains pressure can rise above 5 bar or the maximum working pressure of any item of equipment or component to be fitted in the system, a pressure limiting (reducing) valve set to 3 bar will be required.

If you encounter a situation where the water pressure is adequate but flow rates are poor please contact our technical helpline for details of an effective solution.

Note : Each Pulsacoil 2000 is fitted with a strainer and flow regulator on the cold mains supply connection. If the supply pressure is less than 2 bar or if the manifolds (available as an optional extra) are being used or if all taps are provided with flow regulators the flow regulator on the cold inlet should be removed.

No check valve or similar device should be fitted on the cold water supply branch to the PulsaCoil 2000.

To comply with the Benchmark Guidance Note for Water Treatment in Heating and Hot Water Systems the installer should check the hardness level of the water supply and if necessary fi t an in-line scale inhibitor/reducer to provide protection to the whole of the domestic water system. See Appendix C for a copy of the relevant part of the Benchmark Guidance Note.

When specifying this appliance we would recommend that for hardness levels above 200ppm (mg/l) a hard water appliance is used. For hardness levels above 250ppm( mg/l) we would recommend that some form of in-line scale inhibitor/reducer recommended by one of the water treatment companies listed in the Benchmark Guidance Note is also fitted

The hot water flow rate from the PulsaCoil 2000 is directly related to the adequacy of the cold water supply to the dwelling. This must be capable of providing for those services, which could be required to be supplied simultaneously, and this maximum demand should be calculated using procedures defined in BS 6700.

If a water meter is fitted in the service pipe, it should have a nominal rating to match the maximum hot and cold water peak demands calculated in accordance with BS 6700. This could be up to 60ltr/min in some properties.

Note: The diagram below shows the F & E cistern with ballvalve and warning/overflow pipe which can be fitted if required. However, the standard preferred arrangement is for the cistern to be manually filled from a temporary hose connection fitted with a double check valve.



Hot and Cold Water System
Pipe Sizing / Materials

To achieve even distribution of the available supply of hot and cold water, it is important in any mains pressure system, that the piping in a dwelling should be sized in accordance with BS 6700. This is particularly important in a large property with more than one bathroom.

However, the following rule of thumb guide lines should be adequate for most smaller property types as long as water pressures are within the recommended range.

1. A 15mm copper or equivalent external service may be sufficient for a small 1bathroom dwelling (depending upon the flow rate available), but the minimum recommended size for new dwellings is 22mm (25mm MDPE).
2. The internal cold feed from the main incoming stop tap to the PulsaCoil should be run in 22mm pipe. The cold main and hot draw-off should also be run in 22mm as far as the branch to the bath tap.
3. The final branches to the hand basins and sinks should be in 10mm and to the baths and showers in 15mm. (1 metre minimum)
4. We would recommend that best results for a balanced system are achieved by fitting appropriate flow regulators to each hot and cold outlet. This is particularly relevant where the water pressures are above the recommended water pressure range. Details of suitable flow regulators are provided in Appendix A.

Note: If manifolds (available as an optional extra) are being used suitable flow regulators are automatically provided in the manifold and do not need to be provided at each outlet. See Appendix B for further details.

All the recommendations with regard to pipework systems in this manual are generally based on the use of BS/EN Standard copper pipework and fittings.

However, we are happy that plastic pipework systems can be used in place of copper internally as long as the chosen system is recommended for use on domestic hot and cold water systems by the manufacturer and is installed fully in accordance with their recommendations.

This is particularly important in relation to use of push fi t connections when using the optional flexible hose kits - see 2.2 Installation, Pipework connections.

It is also essential that if an alternative pipework material/system is chosen the manufacturer confirms that the design criteria of the new system is at least equivalent to the use of BS/EN Standard copper pipework and fittings.

Taps/Shower Fittings

Aerated taps are recommended to prevent splashing. Any type of shower mixing valve can be used as long as both the hot and cold supplies are mains fed. However all mains pressure systems are subject to dynamic changes particularly when other hot and cold taps/showers are opened and closed, which will cause changes in the water temperature at mixed water outlets such as showers. For this reason and because these are now no more expensive than a manual shower we strongly recommend the use of thermostatic showers with this appliance.

The shower head provided must also be suitable for mains pressure supplies. However, if it is proposed to use a ‘whole body’ or similar shower with a number of high flow/pressure outlets please discuss with the Gledhill technical department.

The hot water supply to a shower-mixing valve should be fed wherever practical directly from the PulsaCoil 2000 or be the first draw-off point on the hot circuit. The cold supply to a shower-mixing valve should wherever practical be fed directly from the rising mains via an independent branch. The shower must incorporate or be fitted with the necessary check valves to provide back-syphonage protection in accordance with the Water Regulations. The supply of hot and cold mains water directly to a bidet is permitted provided that it is of the over-rim flushing type and that a type ‘A’ air gap is incorporated.

Hot and Cold Water System

If the length of the hot water draw off pipework is excessive and the delivery time will be more than 60 seconds before hot water is available at the tap, you may wish to consider using trace heating to the hot water pipework such as the Raychem HWAT system. Please consult Gledhill Technical Department for further details.

Note: A conventional pumped secondary circulation system is NOT suitable for use with this appliance.

It is important that the cold water pipework is adequately separated/protected from any heating/hot water pipework to ensure that the water remains cold and of drinking water quality.




Electrical Installation

The Schematic arrangement of the wiring within the PulsaCoil 2000 is shown above.

The whole of the electrical installation shall be designed and installed by a competent person fully in accordance with the latest edition of the Requirements for Electrical installations BS 7671.

The PulsaCoil 2000 appliance is provided with two side entry 3kW immersion heaters and has been designed to generally operate with an off peak supply.

The lower immersion heater heats the whole of the contents and is normally connected to the off peak supply.


Electrical Installation

The upper immersion heater is positioned at a level on the PulsaCoil 2000 to provide sufficient hot water for at least one bath - see Technical Data Table on page 5. This is connected to the unrestricted on peak supply and is normally switched manually by the householder to provide a day time boost when required. Alternatively a time clock could be wired into this supply to provide an automatic boost on a daily basis if preferred.

The size of the appliance and the need to use the on peak boost facility is reduced if a better off peak tariff can be agreed with the electrical supply company - see Model Selection Guide on page 5.

A 3 amp supply is also required from the unrestricted on peak supply for the control circuit.

Although the PulsaCoil 2000 appliance is primarily designed to operate with an off peak supply it will also operate quite successfully if it is only supplied with an on peak supply. However, this will substantially increase the running costs of the appliance and should only be considered if an off peak supply is not available.

Two typical methods of providing electrical supplies are shown below for information. However, the PulsaCoil 2000 appliance is suitable for use with any method of supply - if unsure please consult Gledhill Technical Department for further assistance.

If separate circuits are provided the two switches must be clearly labelled for the householders use.

Note: In addition to the supplies to the immersion heaters, PulsaCoil 2000 requires a 3 amp supply for the control circuit. This 3 amp supply must be provided via a fused 3 amp double pole isolator providing 3mm of separation to both poles.



The appliance is designed to be installed in an airing/cylinder cupboard and the relevant minimum dimensions are provided in section 1.2 Technical Data.

Because of the ease of installation we recommend that the cupboard construction is completed and painted before installation of the appliance. The cupboard door can be fitted after installation.

If the unit needs to be stored prior to installation it should be stored upright in a dry environment and on a level base/floor.

Installation and maintenance access is needed to the front of the appliance and above the F & E cistern. See Section 1.2 Technical Data for further details.

The minimum dimensions contained in section 1.2 Technical Data allow for the passage/connection of pipes to the appliance from any direction as long as the appliance is installed on the installation base provided. If the installation base is not used extra space may be needed to allow connection to the pipework and the whole of the base area should be continuously supported on a material which will not easily deteriorate if exposed to moisture.

The floor of the cupboard needs to be level and even and capable of supporting the weight of the appliance when full. Details of the weight when full is provided in section 1.2 Technical Data.

The appliance is designed to operate as quietly as practicable. However, some noise (from pumps etc) is inevitable when hot water is being used. This will be most noticeable if the cupboards are located adjacent to bedrooms, on bulkheads, or at the mid span of a suspended floor.

Cupboard temperatures will normally be higher than in a conventional system and the design of the cupboard and door will need to take this into account. No ventilation is normally required to the cupboard.

The separate feed and expansion cistern will need to be located on top of the appliance or at high level in the cupboard housing the PulsaCoil 2000. The dimensions and clearances are provided in section 1.2 Technical Data. The location will need to provide a suitable route for the cold feed and expansion pipe as well as the open safety vent pipe. The location will also need to provide a suitable route and discharge position for the warning/overflow pipe and the ballvalve supply from the mains cold water system (if provided).

Note: The standard appliance is supplied with a cistern without a ballvalve/ overflow for filling manually.

An electrical supply must be available which is correctly earthed, polarized and in accordance with the latest edition of the IEE requirements for electrical Installations BS 7671.

The electrical mains supply needs to be 230V/50Hz.

The sizes/types of electrical supplies must be as detailed in 1.3 System Details, Electrical Installation and the connections must be made using a double-pole linked isolator with a contact separation of 3mm in both poles which are located within 1m of the appliance. The supplies must only serve the appliance.

The hot and cold water ‘first fi x’ pipework should be terminated 50mm above the finished floor level in accordance with the dimensions provided in 1.2 Technical Data.



Before installation the site requirements should be checked and confirmed as acceptable.

The plastic cover and protective wrapping should be removed from the appliance and the installation base (provided) placed in position.

The appliance can then be lifted into position in the cupboard on top of the base and the front panel removed by unscrewing the 2 screws and lifting the door up and out, ready for connection of the pipework and electrical supplies.

The feed and expansion cistern support shall be installed ensuring that the base is fully supported, the working head of the appliance is not exceeded and the recommended access is provided for maintenance - see section 1.2 Technical Data for details.

Preparation/placing the appliance in position.

The ‘first fi x’ pipework positions should be checked using the template provided with each appliance. If these have been followed installation is very simple and much quicker than any other system.

The appliance is supplied shrink wrapped on a timber installation base. Carrying handles are also provided in the back of the casing.

The feed and expansion cistern complete with ballvalve, cold feed/expansion and overflow/warning pipe fittings are provided in a separate box.

If flexible connections have been ordered these will also be inside the feed and expansion cistern.

The appliance should be handled carefully to avoid damage and the recommended method is shown above.

Note: Although the above guidance is provided any manual handling/lifting operations will need to comply with the requirements of the Manual Handling Operations Regulations issued by the H.S.E.

The appliance can be moved using a sack truck on the rear face although care should be taken and the route should be even.

In apartment buildings containing a number of storeys we would recommend that the appliances are moved vertically in a mechanical lift.

If it is proposed to use a crane expert advice should be obtained regarding the need for slings, lifting beams etc.




Pipework connections

The position of the pipework connections is shown opposite. The connection sizes and dimensions are listed in Section 1.2 Technical Data.

All the connections are also labelled on the appliance. It is essential that the pipework is connected to the correct connection.

The connections can be hard piped but we recommend the use of flexible connections (available as an optional extra).

If using push fi t connectors with the flexible hose kits it is important to check that they are compatible. Written approval has already been obtained for:-
Hepworth - Hep2O BiTite
John Guest - Speedfi t
Yorkshire - Tectite

However, as similar assurances cannot be obtained for Polypipe fittings we cannot recommend their use.

Connections A, B and D are plain ended copper pipe.
Connection C is a compression fi tting.
Connection E is RC½ (½ in BSPT internal)

A - Safety open vent
B - Cold feed/expansion
C - Incoming mains cold water
D - Domestic hot water
E - Drain tap connection

Note: The safety open vent and cold feed/ expansion should be connected to the F & E cistern using the pipework assembly provided.

All factory made joints should be checked after installation in case they have been loosened during transit.

The fittings for the feed and expansion cistern should be installed following the instructions provided by the manufacturer in a position to suit the particular location and the cistern fi ted on its supports/base.

The cold feed/expansion and safety open vent should be installed between the appliance and the feed and expansion cistern.


It is normally envisaged that the feed and expansion cistern will be located in the same cupboard as the PulsaCoil 2000 appliance itself to maintain a dry roof space.

The cold feed/open vent pipework assembly (as supplied) should be used if it is intended to install the F & E cistern directly on top of the appliance.

However, if it is necessary to locate the cistern in the roof space (or on a higher floor) the cold feed/open vent pipework assembly (as supplied) should be used to connect to the F & E cistern and pipework site run by the installer to connect this to the appliance.

Obviously, any pipework in the roof space and the feed and expansion cistern will need to be adequately insulated to protect against frost damage.

Combined feed and open vent pipe arrangements must not be used.

No valves should be fitted in the safety open vent which must be a minimum of 22mm copper pipe or equivalent.

The mains cold water supply to the ballvalve shall be provided with a suitable servicing valve.

The overflow/warning pipe (if provided) shall have a continuous fall, be fitted to discharge clear of the building and be sited so that any overflow can be easily observed. It shall also be installed in a size and material suitable for use with heating feed and expansion cisterns in accordance with BS 5449 (e.g 22mm copper) and should not have any other connections to it.

Note: If a warning/overflow pipe is NOT provided the F & E cistern should be filled from a temporary hose connection supplied from any cold water tap or from a permanent cold branch provided adjacent to the F & E cistern. The temporary hose must be fitted with a double check valve and removed once the appliance is filled.



NOTE: The three 230V, 50Hz supplies should be as shown in the
schematic diagram on page 12.

Electrical Connection - Standard Appliance

The PulsaCoil 2000 is pre-wired to a 12 way terminal strip from the A.C.B. and plumbers are well able to complete the electrical installation as long as they are competent to carry out the work strictly in accordance with the IEE Requirements for Electrical Installations BS 7671. The arrangement of the wiring is shown on the previous page.

All the terminals are suitably labelled. Note: Do not attempt the electrical work unless you are competent to carry it out to the above standards.

Before commencing check that the power source is in accordance with section 2.1 Site Requirements and ensure that it is isolated.

Run the external wiring from the adjacent isolator through the service slot provided in the base of the appliance.

Make the connections as shown opposite on the terminal strip provided.

Clamp the cables in the grips provided below the terminal strip and ensure all cables are routed to avoid hot surfaces.

Note: The appliance pipework should be bonded to earth to comply with the IEE Requirements for Electrical Installations BS 7671.

The appliance is provided with a 4.0mm earth cable from a strap on the case to the earth stud on the wiring panel.

Before switching on the electrical supply check all the factory made terminal connections to ensure they have not become loose during transit.


Open the incoming stop valve and fill the domestic mains cold and hot water systems including the PulsaCoil 2000 appliance.

Check the water level in the feed and expansion cistern and if a ballvalve is fitted adjust if necessary.

Check the whole of the domestic hot and cold distribution systems for leaks.


Fully flush and if necessary chlorinate the hot and cold water system in accordance with the recommendations in the Water Regulations and BS 6700.

Once the system is finally filled turn down the servicing valve for the ballvalve in the F & E cistern to the point where the warning/overflow pipe will cope with the discharge arising from a ballvalve failure.

If an overflow is not provided ensure the temporary filling hose is isolated and removed from its connection to the cold water supply.

It is essential that all systems function properly for optimum performance.

To achieve this the flow rate from each tap should be checked and a suitable number of taps run simultaneously to check the impact of this on the flow rate at individual taps.

We recommend that flow restrictors are provided for each tap/terminal fitting to ensure that the available flow is shared evenly - See Appendix A for further details.

Commissioning the PulsaCoil Control System

Once the PulsaCoil 2000 is filled with water the electrical supply to the 3amp control circuit can be switched on and the switches on the two isolating terminal connectors can be pushed home.

WARNING - Pushing home these switches will complete the electrical circuit to the immersion heaters. DO NOT PUSH HOME THESE SWITCHES AND SWITCH ON THE ELECTRICITY SUPPLY TO THE IMMERSION HEATERS UNTIL YOU HAVE CHECKED THAT THERE IS WATER IN THE F & E CISTERN . Failure to do this will result in dry fi ring and premature failure of the immersion heaters, which will invalidate the warranty.

The green indicating lamp on the front of the appliance will light to show the control circuit supply is live.

The red indicating light is not connected on this version of the appliance.

When the green indicating lamp is lit switch on the on-peak (top) immersion heater and allow the appliance to reach temperature. Check that the rod thermostat mounted in the on peak immersion heater has switched off at the correct temperature of approx 72ºC.

When this has been proven isolate the incoming power supplies and remove the incoming on and off peak supplies from the immersion heater supply terminals. Temporarily reconnect the on peak supplies to the off peak terminals (numbers 8, 9) and 10) and allow the appliance to reach temperature.

Check the rod thermostat has switched off the off peak immersion heater at the correct temperature of approx 72ºC.

If the control thermostats do not switch off the immersion heaters at the correct temperature the integral overheat thermostat will operate the manual reset button. In this case check and adjust or replace the relevant rod control and overheat thermostat . Reduce the store temperature by running some hot water and repeat the test relevant to the immersion heater/control thermostat concerned.

Once it has been proved that the control thermostats are working correctly isolate the incoming power supplies and re-connect the immersion heater supplies in accordance with the details in 2.2 Installation.

Run a tap and using a digital thermometer check that the temperature of the hot water is about 55°C. This temperature is factory set and is independent of the store temperature and hot water flow rates.

This product is covered by the ‘Benchmark’ scheme and a separate commissioning/ service log book is included with this product. This must be completed during commissioning and left with the product to meet the Warranty conditions offered by Gledhill.

Important Do’s and Don’ts

1. DO check the incoming mains water pressure. The preferred range of mains pressure is 2 -3 bar.
2. DO check the flow rate of the incoming cold water main is adequate to meet the maximum hot and cold water simultaneous demands.
3. DO check that all connections are in accordance with the labelling on the thermal store.
4. DO NOT push home the 2 switches on the isolating terminal connectors and switch on the electricity supply until you have checked that the appliance is full of water i.e. there is water in the F & E cistern.
5. DO check the water level is correctly set in the F & E cistern when cold and that there is no overflow when the appliance is up to temperature.
6. DO check that the rod thermostats switch the immersion heaters on/off at the correct set points i.e. approx 72°C.
7. DO insulate any exposed hot water pipework in the PulsaCoil cupboard.
8. If the ballvalve in the F & E cistern is permanently connected to the mains cold water supply DO plumb the overflow/ warning pipe in a 20mm internal diameter pipe and ensure it discharges in a conspicuous external position. Use a material which is suitable for use with heating F & E cisterns in accordance with BS 5449 (such as copper).
9. DO ensure the green light is ‘on’ .
10.Once the appliance is filled and commissioned DO leave the electricity switched on to the appliance to ensure the automatic pump run facility can operate to prevent the pump sticking.
11. DO ensure that the functioning and control of the system is explained to the occupant.
12. DON’T place any clothing or other combustible materials against or on top of this appliance.

These instructions should be placed along with the component manufacturers instructions in the pocket provided on the rear of the front panel. The front panel should then be refitted.


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares


No annual servicing of the PulsaCoil 2000 is necessary.

However, if required, the operation of the controls and a hot water performance test can be carried out to prove the appliance is working satisfactorily and within its specification.


Free of charge replacements for any faulty components are available from Gledhill during the in-warranty period on return of the faulty part (normally 12 months).

After this, spares can be obtained direct from

However, all components are readily accessible and can be changed quickly and easily by the installer using common plumbing practice. If it is necessary to replace the pump fitted to the appliance the pump head (motor pack) only should be removed as recommended by Grundfos. Assuming it is within warranty this will be accepted by a merchant as being covered by the Grundfos national service exchange agreement, as long as it is a complete pump i.e. alleged faulty motor pack and new base is left with the merchant. It is important when a pump has been replaced to ensure that any air is adequately vented and the pump is set on speed 3.


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares




For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares


Despite everyones best efforts some problems can occur and lead to complaints from the householder.

The following checks should be carried out by the installer before calling the manufacturer.

1. Noise when hot water tap is opened/closed

If the plate heat exchanger pump is noisy when the hot water tap is opened, then check the level of water in the F & E cistern and vent the pump if necessary. Water hammer - loose pipework and/or tap washers.

2. Causes of ‘Unsatisfactory Hot Water Service’

DHW temperature remains cold exiting the taps

 - Thermal store is cold/DHW pump is stuck
- Temperature sensor or pump speed control l PCB is faulty
- Too little or too much flow from the pipe
- The water level is low in the F&E cistern.
- Overheat stat tripped

DHW temperature fluctuates wildly when flow is steady. DHW pump keeps sticking when voltage is reduced and not starting until voltage is too high.
DHW temperature exceeds and remains well above 60ºC when the flow rate is low. - DHW pump speed control PCB and/or temperature sensor is/are faulty.
- Immersion heater thermostat temperature setting too high should be 72ºC.
Store not heating - The two switches on the isolating terminal connectors are not pushed home
- i.e. unit is not commissioned.
- No power supplies to control circuit and heaters
- Overheat stat has tripped

3. Overflow from Feed and Expansion Cistern

Check that the controlled level of water in the cistern is at the correct level. Adjust if required or check the ballvalve is shutting off the water supply.



A number of the DHW faults indicated in the above chart will be indicated by the pump speed control PCB.

The layout of the pump speed control board is shown opposite. In faulty conditions if the hot water outlet temperature exceeds 60º, the pump speed will be reduced to minimum and if the outlet temperature exceeds 65ºC, the pump will be switched off until the outlet temperature reduces to 50ºC.

If hot water has not been used for a period of 30 hours the pump speed control board will run the pump for approximately 3 seconds to help prevent it sticking.

The red LED on the pump speed control board will also flash differently to indicate a number of fault conditions - see diagram opposite. If necessary change the faulty sensor (fault 2,3, or 4) board (fault 5) or fuse/check electrics (fault 6) to resolve the problem.

If the problem cannot be resolved by the installer the manufacturer should be contacted.

When requiring a visit from the manufacturer the installer must have the completed ‘Benchmark’ commissioning/ service record sheet to hand to enable help to be provided.



Vast quantities of water are needlessly run off to waste due to Taps, Mixers and Showers discharging flow rates far in excess of the rates required for them to perform their duties. The contrasting flow rates shown on this leaflet clearly illustrate the savings that can be made whilst still providing a good performance.

British made Aquaflow Regulators provide constant flow rates by automatically compensating for supply pressure changes between 1 bar & 10 bars. To facilitate installation into the wide range of plumbing equipment which is encountered in the U.K, Four Fixing Options are available:-


1. MXF “DW” Range - For fitting behind Fixed Shower Heads or onto Flexible Hoses for Handshowers (preferably onto the inlet end when lightweight hoses are used).

2. Compression Fitting Range. “In Line” regulators as in Option 4 for Taps & Mixers.


1. MK Range - Combined Regulators & Aerator for screwing onto Taps & Mixers with internal or external threads on their noses. Anti Vandal models also available.

2. MR05-T Range - Internal Regulators. Push-fi t into Tap or Mixer seats. Produced in three sizes - 12.5mm (BS1010), 12mm & 10mm, Flangeless models also available for Taps with Low Lift washers.

3. MXF Standard Range - Screw on tail models for Taps & Mixers. Fix onto the tails before fitting the tap connectors. Available in 3/8", 1/2", 3/4" and 1" BSP.

4. Compression Fitting Range - “In Line” regulators housed in 15mm & 22mm CXC Couplers & Isolating Valves. “ ”UK WFBS listed by the Water Research Centre. Isolation valves available for slotted screwdriver operation or with coloured plastic handles. Now available also in plastic bodied push-fi t couplers & valves.

Information by courtesy of AQUAFLOW REGULATORS LTD Haywood House, 40 New Road, Stourbridge, West Midlands DY8 1PA TELEPHONE (01384) 442611 FAX: (01384) 442612


Two sets of manifolds are available as an optional extra. Each set comprises a separate hot and cold water manifold. Both are provided with a 22mm inlet connection located centrally. All outlet connections are 15mm compression. The centre to centre dimension of each branch is 55mm.


The arrangement of each manifold is supplied as shown. This provides the best balance of flows but the flow regulators/duty of each branch can be changed if required as long as a reasonable balance is maintained. If it is necessary to change or clean the flow regulator this can be done without needing to drain the system by closing the valve and removing the screwed cover below the white plastic cover.

The manifolds are designed to be used with plastic pipework and are supplied complete with isolation valves and flow regulators on each branch. They would normally be installed in the same cupboard as the thermal storage appliance (as shown on page 36) but can be installed in another cupboard close to the appliance if required.




The pressure loss through a flow regulator at the designated flow rate is about 1.8 bar. Therefore for the flow regulator to control the flow rate at pre-set level, the inlet pressure must be greater than 1.8 bar. If the inlet pressure is lower, the flow rate will be correspondingly less than the pre-set values.

The maximum equivalent pipe lengths from the manifold to the terminal fittings can be estimated from the above information and the resistance characteristics of the pipes. The examples presented below are for 15mm copper pipe in table 1 and for plastic pipework in table 2.


The size of the distribution pipes supplying the manifold should be calculated using the method set out in BS 6700. A typical diagrammatic arrangement of a system using Manifold Type 1 is shown below. This is only meant to show the principles involved and the actual connection of fittings to the manifold will need to suit the arrangements shown on page 35.

Note 1 - If it is proposed to fi t chemical water treatment such as a water softener this should be fitted in this location and the cold water branch in the sink should be branched off the cold water main prior to the treatment device instead of the cold water manifold.

Any other isolating/control valves and backflow protection devices should be provided as necessary to comply with the Water Regulations.


For Gledhill PulsaCoil 2000 Parts and Spares click on the following link: Gledhill PulsaCoil 2000 Parts And Spares

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