Worcester 440CDi Manuál s instrukcemi stáhnout pdf (Strana 48)

SETTING THE AIR/GAS RATIO

SERVICING

& SPARES

INSTALLATION & SERVICING INSTRUCTIONS

46

SETTING THE GAS/AIR RATIO

8 716 115 219c (03.2010)

GAS TYPE

CO

2

setting

maximum.

Natural Gas

Type H (G20)

LPG (propane)

(G31)

9.4 ±0.5% 8.6 ±0.5%

10.8 ±0.5% 10.4 ±0.5%

Greenstar Highflow 440CDi

CO

2

setting

minimum.

GAS TYPE

CO

2

setting

maximum.

Natural Gas

Type H (G20)

LPG (propane)

(G31)

9.4 ±0.5% 9.0 ±0.5%

10.8 ±0.5% 10.4 ±0.5%

Greenstar Highflow 550CDi

CO

2

setting

minimum.

IMPORTANT: The appliance is set at the

factory and adjustment to the CO

2

settings (air/gas ratio) is only required

where the appliance has been stripped

down and assembled or if the fan, burner

or gas valve are replaced or the appliance

has been converted to a different gas

type.

The air/gas ratio may only be adjusted on

the basis of a CO

2 measurement at

maximum and minimum heat output using

an electronic tester.

Setting the gas ratio MUST ONLY be

carried out by a competent person

equipped with a combustion analyser

conforming to BS 7927 and competent in

its use.

Remove cap [J] on the “flue gas sample

point”, as shown in the figure on page 38,

and connect a flue gas combustion

analyser. Replace the cap after use.

1

Connect manometer to the inlet pressure

point (A) on the gas valve.

Measure the inlet pressure, it should be

between 17 - 19mbar (nominally 18 mbar)

for Natural Gas and between 35 - 39mbar

(nominally 37mbar) for LPG.

2 To adjust the CO

2

it will be necessary to

first operate the boiler at maximum output.

Press and hold down the boost button

(B) for 10 seconds.

Turn temperature control (C) to

maximum, the boiler will then go to

maximum output.

Note: the control will resume normal

operation after 15 minutes or if the

boost button (B) is pressed for more

than 1 second.

3

Remove plastic cap and using a flat

bladed screwdriver, set the CO

2

via adjuster

(D) referring the table opposite.

Note: CO

2

should be measured 10 minutes

after firing the boiler.

Check the CO is less than 200ppm.

4

Turn the temperature control (C) to

minimum. This will make the boiler go to

minimum output.

5

Measure the CO

2

it should now be at the

figure for minimum output shown on the

table opposite. If not, remove cap and

adjust (E) on the gas valve until correct.

Check the CO is less than 200ppm.

Turn temperature control to maximum

output and recheck the CO

2

. If correct,

hold down the boost button (B) for two

seconds, the boiler should return to normal

operating mode with the blue power

indicator permanently illuminated.

Remove manometer and re-seal the inlet

pressure point on the gas valve.

Fit a new plastic sealing cover to outlet

adjuster (D) and replace the cap on the

gas valve.

E

A

B

D

C

1

2

3

4

5

C

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 59 60

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