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http://www.surefiresoftware.co.uk/index.php
INSTALLATION & SERVICE
INSTRUCTIONS
MERSEY
MEDWAY automatic
TRENT thermostatic
GAS FIRED WATER HEATERS
FROM SERIAL No. 58/13130000001
FROM SERIAL No. 55/54130000001
FROM SERIAL No. 55/56130000001
G.C. No. 52 476 24
G.C. No. 52 476 25
G.C. No. 52 476 30
NON SPOUTED MULTIPOINT MODELS
FOR USE WITH NATURAL GAS
THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984.
"In your own interest, and that of safety, it is the law that all gas appliances are installed by competent
persons, in accordance with the above regulations. Failure to install appliances correctly could lead to
prosecution."
Installation must be in accordance with the Building Regulations, byelaws of the water-undertaking, and I.
E.E. Wiring Regulations. It should be in accordance also with any relevant requirements of the Local Gas
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Summary of Contents for Surefire MERSEY
- Page 1 Surefire Software - http://www.surefiresoftware.co.uk/index.php INSTALLATION & SERVICE INSTRUCTIONS MERSEY MEDWAY automatic TRENT thermostatic GAS FIRED WATER HEATERS FROM SERIAL No. 58/13130000001 FROM SERIAL No. 55/54130000001 FROM SERIAL No. 55/56130000001 G.C. No. 52 476 24 G.C. No. 52 476 25 G.C. No. 52 476 30...
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Page 2: Minimum Clearances
50 mm (2in.) below Bottom Cover Allow as much clearance below the appliance as possible for ease of servicing. Nil clearance at the sides. MERSEY 1.95 metres (6.4ft) MINIMUM OPERATING HEAD: MEDWAY 2.29 metres (7.5ft) TRENT 3.36 metres (11.0ft) NOMINAL WATER RATE: 12.5 Litres/min. (2.75 UK gal/min. Raised 25°C (45°F) THE MAXIMUM PERMITTED WATER PRESSURE THROUGH THIS APPLIANCE IS: 13 bar (188.5... -
Page 3: Gas Pressures
Surefire Software - http://www.surefiresoftware.co.uk/index.php 1.2 mm 0.27 mm mbar in. w.g. MARKING MARKING GAS PRESSURES The nominal burner pressure should be 12.5 mbar (5in. w.g.) and will only be obtained if the appliance inlet pressure is correct at 20 mbar (8in. w.g.). - Page 4 Surefire Software - http://www.surefiresoftware.co.uk/index.php IMPORTANT:- Blow out all foreign matter from the supply pipe before connecting to the gas service cock. Test for gas soundness (BS 6891) 2.2 Assemble the water inlet tail, WATER FILTER and water service cock to the water inlet (15mm compression).
- Page 5 Turn on a hot water outlet and adjust the throttle to give a flow of: 1.6 G.P.M. (which is 4.5 seconds to fill a pint milk bottle) for the MERSEY and MEDWAY or, 2.2 G.P.M. (which is 3.5 seconds to fill a pint milk bottle) for the TRENT.
- Page 6 Surefire Software - http://www.surefiresoftware.co.uk/index.php 12.5mbar (5in w.g.) is obtained at the manifold. (b) Slowly reduce the water rate until the gas pressure at the manifold just begins to fall i.e. less than 12. 5mbar (5in. w.g.) and greater than 12mbar (4.8in. w.g.).
- Page 7 Surefire Software - http://www.surefiresoftware.co.uk/index.php 6.4 Remove the push rod seal and push rod. Replace the seal, if necessary, clean the push rod and regrease using Dow Corning 111 silicone grease. (See Section 7.13). 6.5 Check for water and gas soundness, replace 'O' rings, sealing washers and gaskets where required.
- Page 8 Surefire Software - http://www.surefiresoftware.co.uk/index.php DISMANTLING IMPORTANT If water is drained from the system during servicing turn on all hot water taps to purge air from the water system. Turn them off in sequence, starting with the tap at the lowest level.
- Page 9 The top connection on the thermostat valve assembly feeds the connection on the diaphragm housing nearest the gas section. MERSEY AND MEDWAY ONLY The front connection on the venturi assembly feeds the connection on the diaphragm housing nearest the gas section.
- Page 10 Surefire Software - http://www.surefiresoftware.co.uk/index.php 7.3 Cont. TO PREVENT POSSIBLE DAMAGE TO THE HEATING UNIT RELEASE THE SPLIT TUBING NUT (7) WITH A SUITABLE SPANNER WHILST SUPPORTING THE BULB HOUSING HEXAGON BOSS WITH A SECOND SPANNER. ALL MODELS Disconnect the two union connections at (8).
- Page 11 Surefire Software - http://www.surefiresoftware.co.uk/index.php Remove the burner bars see 7.4. Remove the screws at (25) and lift off manifold (26). Check the condition of the gasket, renew if necessary. 7.6 ALL MODELS TO REMOVE THERMOCOUPLE Gain general access as described in 7.1.
- Page 12 Surefire Software - http://www.surefiresoftware.co.uk/index.php Remove the burner and controls assembly see 7.2. Remove the burner bars see 7.4. Remove the thermocouple split nut see Disengage the electrode lead from the rear of the piezo unit. Lift up the pilot block assembly (loose fit) to clear the pilot tube.
- Page 13 Surefire Software - http://www.surefiresoftware.co.uk/index.php Slide out the bottom cover. Viewing the burner and controls assembly from the bottom disengage the electrode lead from the piezo unit at (17). Remove spark button retainer (18) do not lose shakeproof washer. Lift off button (19) and unscrew the piezo unit from its housing.
- Page 14 Surefire Software - http://www.surefiresoftware.co.uk/index.php Wash the filter clean and re-fit. 7.11 ALL MODELS TO REMOVE THE GAS SECTION OF THE AUTOMATIC VALVE Gain general access as described in 7.1. Remove the burner and controls assembly see 7.2. Remove the burner bars see 7.4.
- Page 15 Surefire Software - http://www.surefiresoftware.co.uk/index.php Gain general access as described in 7.1. Remove the burner and controls assembly see 7.2. Remove all the screws (33) and separate the diaphragm housing. Remove the diaphragm. To replace the diaphragm lay the burner and controls assembly onto its burners with the diaphragm housing uppermost.
- Page 16 Surefire Software - http://www.surefiresoftware.co.uk/index.php Gain general access as described in 7.1. Remove the burner and controls assembly see 7.2. Remove the gas section of the automatic valve see 7.11. Remove the brass disc (34) to expose the push rod seal. Carefully prise out the push rod seal and replace with the new one.
- Page 17 Surefire Software - http://www.surefiresoftware.co.uk/index.php 7.15 Cont. Remove the thermostat phial from its pocket. TO PREVENT POSSIBLE DAMAGE TO THE HEATING UNIT RELEASE THE SPLIT TUBING NUT (39) WITH A SUITABLE SPANNER WHILST SUPPORTING THE BULB HOUSING HEXAGON BOSS WITH A SECOND SPANNER.
- Page 18 Surefire Software - http://www.surefiresoftware.co.uk/index.php and that the spacer is correctly located between the thermostat flange and the retaining plate. The retaining plate must be fitted with the drain hole in the plate at the bottom. Check that the two 'O' Rings are in position between the thermostat valve assembly and the throttle body before securing with the screw (36).
- Page 19 Surefire Software - http://www.surefiresoftware.co.uk/index.php Inlet water supply restricted by stop cock Open all stop cocks fully. Clean or exchange filter. Water filter blocked. Raise tank or connect heater to main Head of water from tank supply supply (subject inadequate. to Local Water Authority Regulations).
- Page 20 Surefire Software - http://www.surefiresoftware.co.uk/index.php 5. Excessive resistance to push rods. Exchange push rods and seals lubricating with Corning 111 silicone grease and ensure free movement. 6. Scale in heat exchanger tubes restricting Descale or exchange heating unit. water flow. `F' SLOW OR INCOMPLETE CLOSING OF MAIN BURNER...
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Page 21: Short Spare Parts List
Surefire Software - http://www.surefiresoftware.co.uk/index.php (a) Slow ignition device overadjusted. Re-adjust slow ignition device. (b) Transfer port blocked. Clear blockage. (c) Diaphragm punctured. Exchange diaphragm. (d) Push rod jammed. Exchange push rod and seals lubricating with silicone (e) Thermostat bellows extended by excessive pressure on sensing bulb. - Page 22 Surefire Software - http://www.surefiresoftware.co.uk/index.php...
- Page 23 284 535 Viewing Aperture Glass 10-10145 285 513 Injector N.G. 1.2mm 19-12196 391 677 Thermocouple CF-7749-101-102 10-12416 Junkers Mersey and Medway 395 768 Thermocouple SIT 0-290-148 10-13848 Trent 393 673 Electrode Assembly Sperryn RV 10-12259 14021 285 679 Pilot Injector Special...
- Page 24 Surefire Software - http://www.surefiresoftware.co.uk/index.php 285 762 Igniter Button 10-14641 285 684 Starter/Pilot Button Mersey and 10-13480 Medway 285 783 Starter/Pilot Button Trent 10-13705 285 763 Stop Button 10-14639 285 691 Thermostat (Trent) 10-13486 This leaflet is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearance are changed in the interests of continued improvement.
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