Including Accolade Plus
For Gledhill Accolade Parts and Spares click on the following links: Gledhill Accolade Parts And Spares
An Unvented Mains Pressure Cylinder
Design, Installation and Servicing Instructions
TESTED BY THE WRC EVALUATION AND TESTING CENTRE, A NAMAS TESTING LABORATORY No.0626,AND FOUND TO COMPLY WITH THE BUILDING REGU LATIONS.
PLEASE LEAV E THESE INSTRUCTIONS ADJACENT TO THE APPLIANCE.
In the interest of continuously improving the Accolade range, Gledhill Water Storage Ltd reserve the right to modify the product without notice, and in these circumstances this booklet, which is accurate at the time of printing, should be disregarded.
GLEDHILL ACCOLADE SPECIFICATION
|2||GENERAL DESCRIP TION|
|8||COMMISSIONING & MAINTENANCE|
|9||PROBLEMS & REMEDIAL ACTION|
|10||ACCOLADE P LUS|
|11||SHORT PARTS LIST|
|12||TERMS & CONDITIONS|
These instructions are a guide to the Design, Installation and Servicing and should be read in conjunction with the Installation I Servicing Instructions issued by the manufacturer of the heat source being used, and should be carried out by qualified Plumbing and Electrical Installers in accordance with recognised practice. A copy of these instructions should be left with the unit.
MANUFACTURER: GLEDHILL WATER STORAGE LTD.
|Maximum inlet pressure to Pressure Reducing Valve||6 bar|
|Operating pressure (PRV setting):||1.5 bar|
|Expansion Relief Valve setting||3 bar|
|Maximum primary working pressure:||7 bar|
|Opening pressure of T&P Relief Valve:||4 bar|
|Opening temp. of T&P Relief Valve:||90°C|
|Energy cut-out thermostat setting||95°C|
|Immersion heater: Red ring Type GU||11 TC|
|Rating: 3kW, 240V AC|
|Drain tap will empty 100% of contents.|
All cylinders are manufactured in accordance with the requirements of BS7206: 1990
The tundish must be positioned so that it is visible to the occupant and is away from electrical devices.
COMPONENTS SUPPLIED WITH ACCOLADE:
relief I PRV combination valve.
Temperature & Pressure Relief Valve.
Energy cut-out thermostat.
Energy cut-out motorised valve.
(Note: Two immersion heaters are supplied with the direct ACCOLADE).
In any situation where the volume of heated pipework (e.g. secondary circulation pipes or manifold pipework for multi pie units) exceeds 10 Liters, then an expansion vessel must be fitted to accommodate the extra expansion volume.
HANDLING BEFORE INSTALLATION
ACCOLADE must be handled with care and stored the correct way up in a dry place.
Modifications should not be made to this product. Replacement parts, including immersion heaters, should be purchased from Gledhill Water Storage, or agents approved by them.
Unvented hot water storage vessels need regular routine checks, and these are detailed below. It is for this reason that this manual must always be left attached to the ACCOLADE.
It is rec om mended that these checks be carried out at the time of boiler maintenance by a qualified installer:
1. Manually open the relief valves in turn, and check that water is discharged from thevalvesand runs freely through the tundish and out at the discharge point. Ensure that the valves re-seat satisfactorily.
2. Turn the mains water off and hold open the P&T relief valve until water stops discharging through the tundish, this will depressurize the system. Leave the mains water turned OFF and remove and clean the strainer element in the Pressure Reducing Valve.
3.Check the charge pressure in the expansion vessel (if one is fitted).
4. Re-fill the system and ensure that all relief valves have re-seated.
For Plus SP models add 120mm to height
TIMES 1 and 3 are 15 to 65°( measured at the top of the cylinder.
TIME 2 and 4 is recovery time after 70% of the contents have been drawn off
The Building Regulations 1992 cover the installation of unvented storage water heating equipment in England and Wales. They decree that installation of an unvented unit shall only be carried out by a person competent to do so as defined in the APPROVED DOCUMENT. The Local Authority must be notified of the intention to carry out the work by submitting a Building Notice or by depositing plans.
The system must also be installed in accordance with the Local Water Bye-laws.
ACCOLADE is sold subject to our Conditions of Sale which are set out at the rear of this Specification. Responsibility for selection and specification of our equipment must remain that of our customer and any experts or consultants concerned with the installation and 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.
The ACCOLADE system comprises of a unique twin cylinder designed to give extra strength in a slimline package and is complete with all the necessary safety and control devices needed to allow connection to the cold water mains. All components are correct for purpose and are either factory assembled or are supplied with the unit.
1.2 COLD WATER SERVICE
We supply a combination valve incorporating a Pressure Reducing Valve, Strainer and Expansion Valve separately for installation on site, which will ensure that the cold supply to the system does not exceed 1.5 bar irrespective of normal supply pressure. The supply to the cylinder is via a check valve and the incoming cold water traps a self replenishing pocket of air inside the unit so that expand ion on heating is accommodated within the ACCOLADE.
1.3 HOT WATER SERVICE
DIRECT ACCOLADE units are fitted with 3kW immersion heaters which incorporate a manually re-settable thermal cut-out as well as the usual adjustable thermostat. INDIRECT units have a high efficiency coil in one tube of the twin tube unit to ensure an extremely fast recovery. An energy cut-out motorised valve is supplied separately for fitting to the ACCOLADE body and this will stop circulation to the heat exchanger in the event of a boiler control failure. When ACCOLADE is used with a sealed heating system, the boiler must incorporate its own energy cut-out. A factory fitted thermostat will maintain stored water temperature as required.
1.4 TEMPERATURE/PRESSURE RELIEF
A Temperature and Pressure Relief Valve is fitted in the cylinder body and will operate at either 90oC 4 Bar pressure should fault conditions occur. The outlet from the valve must be connected to a tundish to give the householder visible warning.
1.5 GENERAL FEATURES
The twin tank configuration is important in ensuring more usable water because the pipework is arranged so that gravity circulation takes place constantly around two tubes. In a single tube cylinder some 15 % of the contents, which are below the heat exchanger, remain unheated, and therefore at an unusable temperature. The twin tube design ACCOLADE overcomes this problem and therefore significantly reduces the risk of legionella. Drain down is effected from the very bottom of both tubes.
2.1 GENERAL DESIGN CONSIDERATIONS
The minimum cupboard width to accommodate the ACCOLADE is 720mm with a minimum gap of 30mm on the left side to facilitates the removal of Pressure /Temperature Relief Valves.
The base chosen for the cylinder should be level and capable of supporting the weight of the unit when full of water as shown in GENERAL DATA. The discharge pipework for the safety valves must have a minimum fall of 1 : 200 from the unit to a safe discharge point as outlined in Section 7. All exposed pipework should be insulated and the unit should NOT be fixed in a location where the contents could freeze.
WHEN USING AN ACCOLADE PLUS (SP) COMPLY WITH THE FOLLOWING:
The pipe connecting the boiler flow to the appliance must not be less than 22mm copper or equivalent.
There should be no valves or other equipment in the pipe connecting the boiler flow to the appliance.
If the length of pipe connecting the boiler flow to the appliance exceeds 6m, then you should consult our technical department.
|A100||2/3 bedroom house with 1 bathroom or shower|
|A120||2/3 bedroom house with 1 bathroom and 1 shower en suite.|
|A144||2/3/4 bedroom house with 1 bathroom and 1 /2 showers en suite.|
|A175||3/4 bedroom house with 1 bathroom and up to3 showers en suite or 2 bathrooms and 2 showers en suite.|
|A210||3/5 bedroom house with 2 bathrooms and up to 3 showers en suite.|
|OFF PEAK ELECTRIC MODELS|
|Consult electricity pie's|
2.2 MAINS WATER SUPPLY
Existing properties with a 1/2 inch supply will be satisfactory provided the local mains pressure is good, but should be confined to single bathroom properties.
For new properties where simultaneous demand is required to more than one bathroom or a bathroom and one or more en-suites, the communication and service pipe into the dwelling should be a minimum of 3/4 inch, ( 19mm usually in the form of a 25mm MOPE supply ). The minimum recommended static pressure to operate an ACCOLADE domestic system is 2 BAR. There should be a flow of at least 25 litres per minute or above available into the property.
Normally Accolade provides well in excess of 30 litres /min in most conditions. Flow rates for ALL mains pressure systems are subject to district pressures and system dynamic loss.
2.3 GENERAL RESTRICTIONS
a) The highest hot or cold water draw off point should not exceed 4 metres above the Pressure Reducing Valve.
b) An ascending spray type bidet or any other appliance with a Class 1 back-syphonage risk requiring a Type A air gap should not be used.
c) ACCOLADE should not be used where steam is the primary heating medium, or in a situation where maintenance is likely to be neglected.
d) Unvented cylinders are not suitable for use with solid fuel boilers.
e) Unless a double (dual) outlet mixer fitting is used all cold water connections to mixer fittings must be taken from the balanced cold outlet provided on the combination PRV sup plied with the appliance. (or a seperate PRV set to 1.5 bar.)
f) In larger properties with a number of bathrooms/ en-suites and long pipe runs we would recommend that the balance cold supply is provided with its own pressure reducing valve and is not taken from the balanced cold connection on the com bi nation valve. In this case it will also be necessary to fit a small expansion vessel on the balanced cold water system to accommodate the pressure rise caused by the increase in temperature of the balanced cold water.
2.4 SHOWER FITTINGS
Any type of shower mixing valve can be used as long as both the hot and cold supplies are mains fed. However PRESSURE COMPENSATING shower mixing valves are proven to give better control when more than one fitting are open simultaneously and are therefore STRONGLY RECOMMENDED. Thermostatic versions are preferable.
2.5 PIPE LAYOUT
In all mains pressure installations it is important to remember that the incoming cold supply must be shared between all terminal fittings. It is important that a 22mm supply is brought to the appliance and a 22mm take-off is continued at least to the bath. If there are two baths, 28m m pipework should be considered. Smaller pipework, or the use of flow restrictors, should be considered for other outlets so as to balance the water available. In any event the distribution pipework should be generally in accordance with 856700.
2.6 PLASTIC PIPEWORK
This appliance is suitable for use with plastic pipework as long as the material is recommended for the purpose by the manufacturer and is installed fully in accordance with their recommendations. We recommend the use of barrier pipe, which will also ensure the system can have BritishGas service cover if required.
2.7 SECONDA RY HOT WATER CIRCULATION
Models A 175 and A210 are fitted with a secondary return tapping as standard. This tapping may also be fitted on other models on request. If fitted, an extra expansion vessel may be necessary. A non-return valve MUST BE FITIED near the return connection. No valve or terminal fitting should be installed between the non return valve and the cylinder.
2.8 PRESSURE & TEMPERATURE RELIEF PIPEWORK
The safety relief valves should be installed to discharge in accordance with G3 of the Approved Document of the Building Regulations and should be piped to where it is visible, but will not cause danger to persons or damage to materials.
The discharge pipework should be of metal and from the tundish should fall vertically for at least 300mm, and then continue by continuous fall to a visible safe termination. The discharge termination point should be below a fixed grating and above the water seat of a trapped gully or other permissible terminations as in the Approved Document. Discharges should be visible at the tundish and the termination.
FITTINGS / DESCRIPTION / USE
The safety devices supplied or fitted on an ACCOLADE are selected for their suitability for the temperatures and pressures involved. They must not be changed or removed and it is essential that replacements must be supplied or approved by Gledhill Water Storage Limited. This includes the immersion heaters, which must incorporate energy cut-out, and are available to approved installers from: Gledhill Water Storage Limited, Sycamore Trading Estate, Squires Gate Lane, Blackpool (Telephone 01253 474444).
A) COMBINATION VALVE-- COMBINES ELEMENTS 1 ), 2) and 3) below:-
1) Pressure Reducing Valve
This must be fixed near the cylinder. The cold water supply terminal fittings in the property should be taken from the cold water tapping of this valve to ensure balanced hot and cold pressures. This valve is factory set to ensure the correct operating pressure for the ACCOLADE.
2) Non Return Valve
This is integral with the pressure reducing valve to prevent backflow of hot water towards cold water draw off points.
3) Cold water Expansion Relief Valve
This safety device is preset at the factory and is to relieve excess cold water pressure resulting from a fault condition.
B) TEMPERATURE/PRESSURE RELIEF VALVE
This safety device is also pre-set at the factory and relieves before the temperature reaches 100° c and admits cold water to the cylinder. It is also a Pressure Relief Valve, and is pre-set to 4 bar.
C) IMMERSION HEATERS
These are 3kW 240V AC heaters and incorporates thermostat and a manually reset cut-out which operates at 80°C. They have lncoloy elements to prolong their life expectancy in aggressive water conditions.
D) LINE STRAINER
This is integral with the Pressure Reducing Valve to reduce the likelihood of contaminants fouling the valve seat.
This is to allow the discharge from any Relief Valve to be seen. It must be fitted away from any electrical devices. See page 5 for discharge pipework details.
TYPICAL DISCHARGE PIPE ARRANGEMENT
ALTERNATIVE DISCHARGE ARRANGEMENT (HIGH LEVEL)
Locations to be avoided when siting a discharge pipe at high level:
1. The pedestrian discharge area, pipe or should above not a window, located door, above
2. create Subsequent a hazard freezing to of persons the about discharge the should building.
3. The water at adjacent 80oC. structure should be impervious to water at 80C
Two immersion heaters are fitted to all direct models.
Where it is intended that units a refitted to off-peak circuits, then suitable controllers must be supplied. External wiring to the immersion heaters must be in accordance with the relevant IEE Wiring Regulations and the circuit must be protected by a suitable fuse and a double pole isolating switch.
The immersion heaters must be earthed, and they should be isolated from the mains before the cover is removed on every occasion. Replacement immersion heaters should be obtained from Gledhill Water Storage Limited.
ACCOLADE is fitted with a Pressure Relief Valve to cope with any increase in system pressure above the design limitations, and a Temperature Relief Valve to provide an adequate safety factor when used with boilers up to 45kW output. The primary water temperatures should be controlled as outlined below.
5.2 PRIMARY CIRCUIT
It is essential that the circuit between the boiler and the ACCOLADE is pumped. The motorised zone valve supplied should be fitted adjacent to the unit and controlled by the cylinder thermostat supplied. The thermostat and motorised valve must be wired so that they both switch off should an overheat situation develop. It is important to follow the wiring diagram in the Wiring Section of these instructions.
5.3 SEALED PRIMARY CIRCUIT
Any boiler used must be of a rated output of less than 45kW and must be fitted with an over temperature cut-out.
Unvented primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe provided a 'Listed' double check valve or some other no less effective backflow prevention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use.
NOTE: The G/Y earth wires are not required on Danfoss motorised valves.
ACCOLADE FUNCTIONAL FLOW DIAGRAM
COMMISSIONING & MAINTENANCE
7 .1 Connections can come loose in transit, and all should be checked before installation.
7.2 Ensure that the immersion heater setting is between 55 and 60°C and that the wiring is in accordance with the diagram on page 9.
7.3 Check that the drain cock is closed, and open all the cold and hot water taps and other terminal fittings. Allow the system to fill with water, and to run until there is no air left in the system. Close the taps and inspect the system closely for leaks.
7 .4 Manually open the Relief Valves one by one and check that water is discharged and runs freely through the tundish and out at the discharge point. The pipework should accept full bore discharge without overflowing at the tundish, and the valve should seat satisfactorily.
7 .S Set the control thermostat at SS°C. Al low the cylinder to heat to Norma I working temperature, then thoroughlyflush the secondary pipework through each tap.
7.6 If it is necessary to drain the cylinder switch off the boiler/immersion heater, open the nearest hot tap and run all hot water until cold. Then close the stop tap and open all hot taps in the system. AT THE SAME TIME HOLD OPEN THE PRESSURE AND TEMPERATURE RELIEF VALVE UNTIL WATER STOPS DISCHARGING INTO THE TUNDISH. OPEN THE DRAIN COCK AND IMMEDIATELY HOLD OPEN THE P & T RELIEF VALVE AGAIN. THIS MUST BE HELD OPEN UNTIL THE CYLINDER IS COMPLETELY DRAINED.
7 .7 Remove and clean the strainer element in the Pressure Reducing Valve, then replace it and re-fill the system.
7.8 Allow the cylinderto heat to normal working temperature with whatever heat source is to be used, and check again for leaks. The Pressure Relief Valve should not operate during the heating cycle.
The Registered Installer is responsible for the safe installation and operation of the system. He must also make his customer aware that periodic checks of the equipment are essential for safety.
Maintenance and inspection periods will vary for many reasons. Gledhill Water Storage Ltd recommend a maximum of 12 months between inspections to coincide with boiler maintenance. Experience of local water conditions may indicate that more frequent inspection is desirable, eg. when water is portico I arly hard, scale-forming or where the water supply contains a high proportion of solids, eg. sand. Maintenance will include the following:
1. Check and clean filter.
2. Manually check the operation of the temperature relief valve.
3. Manually check the operation of the expansion relief valve
4. Check discharge pipes from temperature and expansion relief valves are free from obstruction and blockage and are not passing any water.
5. Descale heat exchangers in hard water areas (if required)
6. Check that water pressure downstream of pressure reducing valve is within the manufacturers limits.
7. Check operation of motorised valve.
8. Drain the appliance down to the level of the temperature e relief valve (following the instructions in item 2 under Maintenance on page 4} and refill to ensure the expansion 'bubble' is fully charged.
PROBLEMS & REMEDIAL ACTION
PROBLEMS & REMEDIAL ACTION
In hard water areas it is recommended that an in-line scale inhibitor is fitted. Reducing the tern perature of the stored water will reduce the rate at which scale forms. If the recovery rate is badly affected, this is an indication that scaling may have occurred. In this event, follow the procedures as recommended by a reputable Water Treatment Company.
a) No water at the tap. Check that the mains water supply is turned ON. Check the line strainer is not blocked. Check that the combination valve has been fitted so that water is flowing in the correct direction.
b) If the water at the tap is cold, ensure that the boiler has been switched ON and is working correctly. Check that there are no air locks in the primary system. ISOLATE THE UNIT AT THE MAINS ELECTRIC SUPPLY AND THEN CHECK THE FOLLOWING:-
i) The cylinder thermostat.
ii) The thermal cut-out, which can be re-set by pushing the red button.
iii) The motorised valve.
iv) The boiler thermostat.
v) The boiler thermostat cut-out (if fitted).
ANY ENERGY CUT-OUT MUST NEVER BE BY-PASSED UNDER ANY CIRCUMSTANCES.
If the units are not getting hot and the heat source is electrical, ensure that the immersion heaters are isolated from the ma ins before re-setting the energy cut-out. If the immersion heater(s) need replacing this should be done with the units supplied from Gledhill Water Storage Ltd. Sa me day dispatch to a pp roved installers can be arranged by telephoning 01253 474444.
8.3 DISCHARGE FROM RELIEF VALVES
If cold water is discharging from the expansion relief valve into the tundish carry out item 2 under Maintenance on page
lf the fault continues and the problem cannot be stopped by operating the easing control a few times then either the Pressure Reducing Valve or the Relief Valve may be at fault. If the cold water pressure is too high, this would suggest that the Pressure Reducing Value is at fault and the Gledhill approved replacement should be fitted. If the pressure is correct then the Relief Valve will require replacing with a Gledhill approved component.
See Commissioning 7.6 for drain down procedure.
If there is an overheat fault and very hot water is being discharged, turn off the heat source, but not the water supply.
When the system is cool, check thermostats and energy cut-outs in the boiler and immersion heaters and replace the faulty component with a unit supplied by Gledhill and check that it works correctly before returning the system to full operation.
ACCOLADE PLUS (OV)
This Accolade Plus (OV) is a pre-plumbed, pre-wired system cylinder suitable for use with an open vented primary system which, in addition to the standard controls for unvented hot water storage, incorporates a Honeywell'$' Plan (See figure 4 ).
This comprises of two 2-port motorised valves, one for heating and one for hot water, a Grundfos 15-50 pump, and a spring loaded by-pass valve.
The standard common flow/heating connections and 2 port valve are 22mm diameter on all models up to and including the A 175 and 28mm diameter on the A210. 28mm diameter connections are available on the smaller models on request.
ACCOLADE PLUS (SP)
The SP version is suitable for use with a sealed primary system, and in addition to the components fitted to the OV version, there is also a 10 litre expansion vessela pressure gauge, an expansion relief valve (pre-set to 3 bar) and a filling loop. (See figure 5 ).
When filling the primary system via the filling loop, the valves should be closed off when the pressure reaches the chosen initial pressure. (This is normally equal to the pressure to which the expansion vessel is pre-charged (in this case 1 bar).
The filling loop should be removed and left adjacent to the appliances for future servicing.
The pipe connecting the boiler flow to the appliance must be a minimum of 22mm copper or equivalent.
There should no valves or other equipment in the pipe connecting the boiler flow to the appliance .
If the length of pipe connecting the boiler flow to the appliance exceeds 6m, then you should consult our technical department.
Refer to BS 5449 for maximum allowable system volume eg. under the above conditions the max volume would be 91 Iitres. lf the system volume is greater, then an additional I vessel will be required.