Worcester 28i Junior Spezifikationen PDF herunterladen (Seite 12)

Room

thermostat

and/or mains

programmer

(or link) On

facia

programmer

(if fitted) On

CH control

knob On

33

18. Operational Flow Diagrams

MAIN SWITCH

ON

CENTRAL

HEATING

DEMAND

Pump on.

Fan ON/

ignition

sequence.

Burner Light

On.

Three minute

wait

Gas valve Off.

Burner light

off. (Pump still

On)

Over tempera-

ture shut-

down if flow

temperature

5°C above set

value

19 second

minimum

burner

pressure then

ramp up

pressure over

next one

minute

Modulate gas

to maintain

flow

temperature

set by control

knob

(50-82°C)

DEMAND

END

Overrun

function

(see overleaf)

CENTRAL HEATING FUNCTION

AND

AND

DOMESTIC HOT WATER FUNCTION

MAIN SWITCH

ON

Flow sensor

signal

(Tap open)

DOMESTIC

HOT WATER

DEMAND

(Priority over

CH demand)

Pump continue

4 seconds if

primary temp

above DHW

setting. Burner

to MAX.

Modulate gas

to maintain

delivered

water

temperature

(55°C)

Is CH

interrupted?

DHW temp

drops to

<55°C

Over

temperature

shut-down if

water

temperature

above 80°C

Primary

temperature

94°C

DEMAND

END

Overrun

function

(see overleaf)

YES

NO

Ignition

sequence and

burner to MAX

Gas valve off.

Primary

78°C

Gas valve off.

Pump on

12

Fig. 10. Functional flow diagram.

On/Off

switch

ST2

(LS)

ST2

(LR)

ST2

(N

S)

ST1

centre

pin

ST15

right

pin

Pump

Fan

ST2 Pin N

Optional link

Room

thermostat

Transformer

Fuse F2

(1.25A Slow)

Fuse F1

(2A Slow)

N

N

ST2 Pin L

LIVE

IN

Electronics

Electronics

Inputs

Outputs

Spark Indicators

Settings

Regulator valve

Spark

electrodes

Error

indicator/reset

Red

Main valves

Flow sensor

CH sensor

DHW sensor

Air pressure switch

Flame sense

Overheat cut-off

24V programmer (if applicable)

Gas valve mode switch

CH Control knob

Convert AC to low

voltage electronics

Electronics/

microprocessor

(Safety Low Voltage)

Flame detect

indicator

Red

ST2

centre pole

(Ls)

(for other features)

low

high

Electronics

ST1

right

pin

Reset button

white

red

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