SERVICING | & SPARES |
51
REPLACEMENT OF PARTS
31.1
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| 31. Bypass valve |
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| Remove the Hydraulic block from the boiler |
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| (See Removing the Hydraulic Block). |
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| 31.1 Remove the two spring clips at either end of |
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| the copper bypass pipe. |
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| Undo the screw securing the left hand |
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| 31.2 | plastic housing to the heat exchanger |
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| Move the housing to the left to free up the | |
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| one end of the pipe. |
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| Remove the pipe from the right hand housing |
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| to reveal the bypass valve |
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| 31.2 Using a pair of pliers, pull out the bypass |
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| valve (A) from the housing |
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| To refit, follow the above in reverse. Ensure |
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| any seals that have been disturbed are |
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| renewed. |
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| 32. Expansion vessel |
| A |
| The expansion vessel can be replaced with the |
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| boiler in position if there is a side exit flue fitted |
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| and there is a minimum clearance of 340mm |
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| above the boiler casing. If vertical flue is fitted |
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| then a similar clearance to one side and the flue |
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| is required. |
32.1 | 32.2 |
| If clearance is not available, the boiler will need to |
| be removed from the mounting frame to gain | ||
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| access to the expansion vessel. |
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| Alternatively a second vessel of at least the |
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| capacity of 7lts can be fitted to the return from |
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| the heating system as close as possible to the |
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| boiler. |
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| Expansion vessel replacement |
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| (Boiler in place) |
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| Isolate mains power from the boiler. |
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| Place the controls in service position. |
| 32.3 |
| Isolate the boiler from the heating system |
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| (and cylinder return if internal diverter valve is | |
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| fitted) using service valves. |
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| Drain boiler. |
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| 32.1 Remove clip from expansion vessel |
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| connection. |
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| 32.2 Remove screw retaining the vessel to the top |
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| of the boiler casing. |
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| 32.3 Pull the vessel up and out over the flue |
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| system or to one side if fitted with a vertical |
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| flue. |
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| Remove the flexible hose from the expansion |
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| vessel and fit to the replacement vessel |
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| using a new seal. Ensure that the connection |
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| to the boiler will be pointing to the right hand |
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| side of the appliance when fitted. |
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| Reassemble expansion vessel into boiler and |
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| connect flexible pipe to boiler. |
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| Removing boiler |
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| Isolate electrical supply. |
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| Isolate system and gas connections at the |
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| service valves. |
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| Drain boiler. |
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| Disconnect electrical supply and any external |
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| controls. |
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| Disconnect flue connection from the boiler. |
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| Undo connection to boiler at the service valves. |
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| Remove clip from expansion vessel |
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| connection to the boiler. |
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| Gently raise the boiler off the mounting frame. |
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| Replace expansion vessel and refit the boiler |
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| to the mounting frame. |
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| Follow the commissioning procedure in this |
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| manual. |
REPLACEMENT OF PARTS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)
