Worcester 28i Junior Spezifikationen PDF herunterladen (Seite 9)

Is there a 230V AC live

supply across

Terminal ST2 pins L

and N?

Switch off electrical

power.

Has fuse F1 blown?

Replace fuse and

investigate cause.

Suggestions: Cable

damage, connections

to (or faults within)

pump, fan, external

230V controls,

transformer or board.

Check electrical

supply to boiler.

Has fuse F2 blown?

TEST A

Yes

Replace fuse.

This will be caused by

fuse fatigue or by the

board.

Remove control board from facia

and separate transformer from

board. Measure resistance across

the two pairs of adjacent pins on

the transformer. Is any coil above

100 ohms?

Replace transformer.

Yes

Replace

control

board.

NOTE: It is normal for

there to be no facia

lights if the boiler is in

normal overtempera-

ture condition.

Continue this test if

this fault occurs when

the appliance is cold.

Is there a 230V AC live

supply across

Terminal

ST2 pins Lr

and N?

TEST B

Yes

Replace

control

board.

NOTE: Lights will be

off and pump will run

if boiler is in 3min

anticycle condition.

With CH control knob

fully clockwise, if

there is still no CH

function, continue:

There is no heat

demand. Check room

thermostat or external

programmer (or link).

Is there a facia

mounted programmer

at connection ST5 at

right-hand end of

board?

Remove programmer

connector from edge

of board. Does the

boiler now ignite?

Correctly set or

replace programmer.

Yes

6.1 A separate vent for combustion air is not required. Refer to

BS5440:2.

The system must comply with requirements of BS6798 and

BS5449 and, in EIRE, the current edition of IS813. It must not be

operated without being full of water and correctly pressurised.

Otherwise a lockout fault will occur when the boiler is powered up.

The pressure relief valve will operate at 3 bar. The discharge pipe,

of 15mm diameter, must be directed such that the discharge of

water or steam is visible, will not discharge onto the occupants

of the premises or cause any damage to the premises, in

particular any electrical components or wiring.

The expansion vessel, to BS4814, has a capacity of 6 litres

charged to 0.5 bar, which is suitable for a static head of 5 metres.

A schraeder type valve allows the pressure to be increased if the

static head is greater than 5 metres.

If the expansion vessel fails then it must be replaced with the

designated spare part.

Refer to BS 7074:1, BS5449 and Table 9 for a guide to the

available system capacity. The maximum system design pressure

is 1.5 bar. If the pressure is above 2.65 bar when the appliance is

at maximum temperature then an additional expansion vessel

must be fitted as near to the appliance as possible in the return

pipe. The pressure gauge shows the system pressure.

Fill and pressurise the system through a WRAS approved filling

loop.

The system and the appliance must be fully vented. Repeated

venting loses water from the system, which must be replaced.

The make-up connection must be close to the appliance in the

heating return pipe through an approved non-return valve.

Plastic pipes must not be directly connected to the boiler. A

copper to plastic transition piece should be positioned a

minimum of 600mm from the boiler. A plastic pipe with a

polymeric barrier must be used.

The connection to the mains water supply must have the

approval of the local Water Company.

An integral non-adjustable by-pass is fitted .

The pump is set at maximum and should not be adjusted.

All connections in the system must withstand a working pressure of up

to 3 bar.

The radiator valves must conform to BS 2767:10 and other

valves to BS1010.

This appliance is NOT suitable for connection to an open vent

system.

7. Sealed System

6. Air Supply

Fig. 7. Sealed primary water system.

Lockshield

valve

Radiator

valve

Heating

return

Hot water out

Water main

British Standard stop valve.

Fixed spindle type

NOTE: A drain cock should be installed at the

lowest point of the heating circuit and below the

level of the appliance.

Mains cold

water

Heating

flow

APPLIANCE

Refer to 'Water

Flow Diagram'

Fig.2.

Cold water inlet

8. Open Vent System

Fig 8a - System make up

1.Central Heating Return

2.Auto Air vent

3.Non-return Valve

4.Make-up Vessel

5.Stop Cock

300mm Above

the highest point

of the system

Fig 8b - Filling loop

Heating

return

Stop

cock

Hose union

Temporary hose

Non return

valve

Non return

valve

Test cock

Mains water

supply

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 21 22

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