Potterton Mersey Super Installation And Service Instructions Manual
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Potterton Mersey Super Installation And Service Instructions Manual

Potterton Mersey Super Installation And Service Instructions Manual

Gas fired water heater
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INSTALLATION AND SERVICE INSTRUCTIONS
G.C. NO.52476 38
NON SPOUTED MULTIPOINT MODEL
THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984.
"In your own interest, and that of safety, it is 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 Region and Local Authority
and the relevant recommendations of the following British Standard Codes of practice: BS 6891, BS 5440:1:2 and BS 5546.
LEAVE THESE INSTRUCTIONS WITH THE USER FOR USE ON FUTURE CALLS
Mersey Super
Gas Fired Water Heater
IMPORTANT
PLEASE READ THIS BOOK
BEFORE INSTALLING,
OPERATING OR
SERVICING THIS
APPLIANCE.
FOR USE WITH NATURAL GAS

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  • Page 1 INSTALLATION AND SERVICE INSTRUCTIONS Mersey Super Gas Fired Water Heater G.C. NO.52476 38 NON SPOUTED MULTIPOINT MODEL FOR USE WITH NATURAL GAS THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS 1984. “In your own interest, and that of safety, it is law that all gas appliances are installed by competent persons, in accordance with the above regulations.

  • Page 2: Energy Cut-Off Device

    VENTILATION Being a room sealed appliance, the Mersey Super does not require an air vent in the room or space in which it is installed. Where this appliance is installed in a compartment, air vents to the compartment at both high and low levels, should be provided for cooling.

  • Page 3: Technical Specifications

    2. TECHNICAL SPECIFICATIONS - Page 3 Finish White stoved paint with contrasting chassis Weight Packed 21.0 kg. (46.2 lb.) Weight without Water 17.8 kg. (39.2 lb.) Weight with Water 18.6 kg. (41.0 lb.) Water Capacity 0.75 litre (0.17 gall.) Input 30.3 kW (103,000 Btu/h.) Maximum Output 22.7 kW (77,400 Btu/h.)

  • Page 4: Installation

    3. INSTALLATION - Page 4 LOCATION If the appliance is to be fixed to a suitable existing terminal first isolate and remove the old appliance. Flue Leave the flue terminal in place. Retain the fixing nuts Terminal and washers. Make good any damage to the brickwork or plaster around the terminal.

  • Page 5: Gas Connection

    INSTALLATION - Page 5 Fit the flue terminal sealing strip (packed separately in the carton) into the recess around the flue aperture in the back of the appliance. Lift the appliance into position, locating the flue outlet into the circular duct on the flue terminal. Secure with the appropriate nuts and washers.

  • Page 6: Water Connections

    INSTALLATION - Page 6 WATER CONNECTIONS IMPORTANT: Flush out all foreign matter from the supply pipe before connecting to the service cock. Assemble the filter, olive and inlet tail to the water inlet. NOTE: The inlet tail need not be used as a vertical supply can be routed directly onto the water inlet.
  • Page 7 4. COMMISSIONING - Page 7 WARNING: The outer case of this appliance is not merely a cosmetic device. It is a functioning component in the air supply to the burner and MUST BE replaced with great care NOW, before any attempt is made to light the burners. TO ALLOW THE MAIN BURNER TO IGNITE WITHOUT THE CASE IN POSITION IS A HAZARD.
  • Page 8 COMMISSIONING - Page 8 NOTE: If a gas rate check is required, the gas consumption after 3 minutes running should be approximately 48.5 l/mm (1.7³/min). Turn OFF the hot water outlet and press the OFF button ’ ‘ on the appliance. Remove the pressure gauge and replace the screw and sealing ring.
  • Page 9 SERVICING - Page 9 Operate the appliance noting any faults in the component units. Carry out the servicing procedure then correct any other faults by reference to ‘Replacement of Parts’, in which T hermocouple section you will find details of how to dismantle and reassemble the following detailed components.

  • Page 10: Replacement Of Parts

    6. REPLACEMENT OF PARTS - Page 10 IMPORTANT: THE FOLLOWING WORK SHOULD ONLY BE CARRIED OUT BY A COMPETENT SERVICE ENGINEER. E.G. BRITISH GAS OR CORGI REGISTERED PERSONNEL IF WATER IS DRAINED FROM THE SYSTEM DURING SERVICING, TURN ON ALL HOT TAPS TO PURGE AIR FROM THE WATER SYSTEM.

  • Page 11: Piezo Unit

    REPLACEMENT OF PARTS - Page 11 6.1. PIEZO UNIT Button It will NOT be necessary to remove the outer case. Piezo Unit Slide out the bottom cover. Disengage the electrode lead from the piezo unit. Remove or loosen and pull aside the spark button retainer, taking care not to lose the shakeproof washer.

  • Page 12: Pilot Injector

    REPLACEMENT OF PARTS - Page 12 6.3. THERMOCOUPLE AND SPARK ELECTRODE Gain general access - see 6.2. Remove the fixing screw and bracket then lower the spark electrode. Disconnect the nut securing the thermocouple to the interrupter at the chassis base. Disconnect the electrode lead from the back of the piezo unit, pull the lead up through the grommet and remove.

  • Page 13: To Drain The Appliance

    REPLACEMENT OF PARTS - Page 13 Test for gas soundness as follows:- Ensure the water service cock is in the OFF Thermocouple position. This will ensure water cannot flow and open the automatic valve. Pilot Turn ON the gas, purge and light the pilot, this will pressurise the burner supply pipe.
  • Page 14 REPLACEMENT OF PARTS - Page 14 Remove 2 screws above the chassis base securing the governor to the automatic valve. Remove 3 screws above the chassis base securing the governor to the chassis base. Carefully withdraw the governor complete with pressure S crews - 2 Off relief valve, TAKE CARE NOT TO BEND THE PUSH ROD.

  • Page 15: Water Governor Venturi

    REPLACEMENT OF PARTS - Page 15 6.8. WATER GOVERNOR VENTURI Gain general access - see 6.2. Drain the appliance - see 6.6. Release the union nut and clamping plate then remove the feed pipe. Using a large flat bladed screwdriverthat will engage both slots, remove the venturi.

  • Page 16: Descaling The Heating Unit

    REPLACEMENT OF PARTS - Page 16 6.10. HEATING UNIT Heating U nit Gain general access - see 6.2. Drain the appliance - see 6.6. P rimary Flue Remove the 2 screws securing the energy cut-off device to the heating unit (located top front left). Heat Exc hanger Disconnect the 2 unions.
  • Page 17 REPLACEMENT OF PARTS - Page 17 6.12. PILOT VIEWING GLASS AND SEAL Viewing Glass S eal Complete steps a., b. and c. of section 6.2. The viewing glass and seal are fixed to the inside of the outer case by 2 metal tabs. Bend back the tabs and remove the glass and seal.

  • Page 18: Fault Finding

    7. FAULT FINDING - Page 18 SYMPTON POSSIBLE CAUSE SOLUTION PILOT WILL NOT LIGHT Gas not turned on. Turn on the gas at the gas service cock and/or the main gas line. Air in gas line. Purge the air line by depressing and holding the centre ON button, this may take 2-3 minutes.
  • Page 19 FAULT FINDING - Page 19 SYMPTON POSSIBLE CAUSE SOLUTION PILOT LIT BUT MAIN BURNER Gas inlet pressure low. Call in your local British Gas WILL NOT LIGHT ON WATER Region FLOW Low water flow caused by blocked Clean the debris from the filter. water filter.
  • Page 20 FAULT FINDING - Page 20 SYMPTOM POSSIBLE CAUSE SOLUTION LOW WATER TEMPERATURE Gas pressure too low. Check and clean gas filter, also check gas inlet pressure. 2. Faulty diaphragm. Will also cause a high Replace the Diaphragm water rate. Assembly - Part No 10/17572. Automatic gas valve push rod sticking.

  • Page 21: Important Note

    FAULT FINDING - Page 21 SYMPTOM POSSIBLE CAUSE SOLUTION SMELL OF COMBUSTION Faulty case or terminal seal. Check that the outer case seal - PRODUCTS Part No 10/17501 and terminal seal - Part No 31/12299 are in good condition, replace if necessary.
  • Page 22 8. SHORT SPARE PARTS LIST - Page 22...

  • Page 23: Short Spare Parts List

    SHORT SPARE PARTS LIST - Page 22 Key No. G.C. Part No. Description. No. Off. Makers Part No. 284 957 Seal Pack - Chassis to Flue Terminal 31/12299 285 907 Case Assembly 10(17543 285 910 Case Seal - Self Adhesive Rubber 10/17501 285 908 Viewing Aperture Seal...

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