Worcester 440CDi Wartungshandbuch PDF herunterladen (Seite 4)

A condensing boiler is more efficient due to its ability to

extract more heat from the flue gases normally lost to the

environment through the flue system.

Greenstar Highflow CDi combis use a proven aluminium-

silicon heat cell with an extra large surface area.

As the flue gases pass through the heat exchanger this

extra surface area cools the flue gases to around 55°C at

which point the latent heat within is released. This is heat

that would normally be lost to the atmosphere.

It is this ability to extract as much heat as possible from

the gas it burns that gives Greenstar Highflow CDi combis

an exceptionally high level of operating efficiency.

This higher efficiency is recognised within section L of the

Building Regulations, subsequently achieving a higher SAP

or NHER rating.

The separate plated DHW heat exchanger combined with

the thermal store ensures that hot water is delivered

instantly to the outlet being operated.

The Greenstar Highflow CDi condensing combi boiler series

The advantages of a combi boiler

A combi (or combination boiler) is a compact and highly

efficient unit giving all the heating and hot water you need,

with significant savings on running and installation costs.

Unlike a conventional heating and hot water system, a

combi boiler system does not store domestic hot water. It

heats water directly from the cold water mains – as you use

it. There’s no hot water cylinder, no tank in the loft (and so

less risk of freezing and flooding), and none of the

connecting pipework.

So you not only save space, but also reduce hot water costs

– which can account for up to 60% of a typical domestic

fuel bill.

A combi also supplies hot water at mains pressure, giving

you powerful showering without the need for a pump. And

as, on average, a shower uses considerably less water than

a typical bath, the savings on hot water costs and water

consumption can be significant.

Modulating central heating and hot water outputs

combined with separate consumer controls, also mean

that comfortable temperature levels for both can be set

independently of each other.

Greenstar Highflow CDi combis are supplied as standard

suitable for sealed primary water systems. The appliance

contains a 12 litre expansion vessel, 3bar pressure relief

valve, pressure gauge and an automatic air vent. The

appliance cannot be used on an open vent system.

Fluing

Greenstar Highflow CDi combis are available as a multi-

directional room-sealed fanned flue appliance.

Gas

The Greenstar Highflow CDi is manufactured in both natural

gas and Liquid Petroleum Gas (LPG) variants.

Operation

Hot water mode

ith the appliance in a standby condition, i.e. thermal store

or heatbank at temperature set by the hot water thermostat,

a demand for hot water will cause the flow turbine to

energise the pump and circulate primary hot water around

the boiler and the plated water to water heat exchanger. The

burner will ramp-up at its maximum setting and modulate

accordingly to maintain the temperature of the heatbank.

When hot water is no longer required the appliance will

continue to operate until the heatbank has returned to the

required temperature.

Priority is always given to the production of domestic hot

water. Should the central heating be in operation when a hot

water demand is made, the supply to the radiators will be

temporarily interrupted.

Central heating mode

On a demand for central heating the pump will energise,

the diverter valve will open and primary water will circulate

around the heating system. The burner will light at the

minimum setting and ramp upwards to meet the system

demand. The radiators will heat up to the temperature set

by the fascia mounted heating temperature controller

(assuming there are no TRVs on the radiators).

Application of Greenstar Highflow CDi combis

•

Worcester Greenstar Highflow CDi combis deliver

domestic hot water at a flow rate of 20 litres/min (4.4gpm)

& 25 litres/min (5.5gpm), making the appliances ideally

suited for use in medium to large sized family homes,

incorporating up to three bathrooms

•

As the Worcester Greenstar Highflow CDi combis deliver

hot water at mains pressure, they are ideally suited to

providing a powerful shower

•

Worcester Greenstar Highflow CDi combis can be sited

where space and water storage is a problem

•

Worcester Greenstar Highflow CDi combis may be used to

provide domestic hot water only, with radiators being

added at a later date

•

The fluing options available with Greenstar Highflow CDi

combis, both horizontal and vertical, offer excellent scope

for siting the appliance, particularly in kitchens, airing

cupboards, etc

•

Worcester Greenstar Highflow CDi combis can be sited

underneath a worktop as servicing can be undertaken

from the front. A removable section of worktop is

recommended should you require top access for

maintenance work

Hot water performance

Greenstar Highflow 440CDi

eenstar Highflow 550CDi

Combi

boiler la

yout

Worcester

combi boiler

with programmer

Room

thermostat

Hot water to baths, showers

and basins etc

Cold mains

Regular

boiler layout

Cold water

storage cistern

Feed and

expansion

cistern

Hot water cylinder

Programmer

Worcester

regular boiler

Room

thermostat

Motorised

valve

Pump

Hot water to

baths, showers

and basins etc

130 litres

182

litres

37.5

32.5

2345

8910

50 litres

72 litres

100 litres

Normal bathing temperature

Temperature ºC ∆ T

Time in minutes

Nominal flow rate 4.4gpm (20l/min)

Cold water inlet 10ºC (50ºF)

42.5

135 litres

183 litres

37.5

32.5

2345

8910

42.5 litres

70 litres

98 litres

Normal bathing temperature

Temperature ºC ∆ T

Time in minutes

Nominal flow rate 5.5gpm (25l/min)

Cold water inlet 10ºC (50ºF)

42.5

Fluing

Greenstar Highflow CDi combis feature 2 different sizes of

multi-dir

ectional RSF flue systems, 100mm or 125mm dia.

The flue can be run horizontally or vertically with

additional 90º or 45º in-line bends allowing changes of

route or direction, providing an extremely flexible and

versatile fluing system enabling the appliance to be sited

virtually anywhere. More details are shown on page 20.

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