Bedienungsanleitung Worcester-Bosch Greenstar Danesmoor Utility Regular - Utility System (Seite 13 von 64) (Englisch)

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Pre-Installation

Greenstar Danesmoor Utility 2022+ and Utility System 2022+ - 6 721 846 263 (2022/01) 13

[NOTE:] The table and illustration above is a guide only and does not in

any way override the de-aerator manufacturer’s instructions

4.3.4 Pipework

▶ Refer to the oil supply sections Single pipe gravity feed

system: 4.3.1, Double pipe sub-gravity feed system: 4.3.2 & Single

pipe suction lift with de-aerator: 4.3.3 for oil supply pipework

configurations.

Oil supply pipework considerations:

• Lay the oil supply pipe as straight and level as possible to avoid air

pockets and unnecessary friction losses.

– Route away from the boiler access door or other hot surfaces.

• Install a manual isolating valve to the oil supply pipe, as close to the

oil storage tank as possible.

• Fit an oil strainer and water separator to the oil supply pipe, near the

oil storage tank.

– Fit an additional oil filter (70 μm max filtration size) close to the

boiler, but not inside the boiler casing.

• Fit a fire valve in accordance with BS 5410.

– The fire valve should be fitted externally to the building with the

fire valve sensor located within the appliance case.

– A fire valve with a shut off temperature of 85°C or higher must be

fitted to avoid the possibility of nuisance shut offs.

– A capillary type valve provides a neat and simple installation.

Alternatively, a fusible link or electrical system may be used.

• Under no circumstances should a combination isolating/fire valve be

used as the sole fire protection device.

4.3.5 Boiler isolation valve

▶ Use copper pipe of the correct diameter according to the information

shown in oil supply sections 4.3.1, 4.3.2 & 4.3.3.

– If using soft copper pipe (R220) with a compression fitting, an

insert must be used to prevent the pipe from collapsing or

distorting when the fitting is tightened.

▶ Slide nut [1] and olive [5] onto the oil supply pipe [4].

▶ Slide insert [3] into the pipe.

▶ Offer the pipe to the fitting [2] and tighten the nut [1].

Fig. 8 Isolation valve bracket removed for clarity

▶ Use flexible hoses to connect to the oil pump.

4.4 Water systems and pipework

Primary system plastic pipework:

• Any plastic pipework used for the CH system must have a polymeric

barrier, complying with BS 7921 and installed to BS 5955 with

1000mm (minimum) length of copper or steel pipe connected to the

boiler.

• Plastic pipework used for underfloor heating must be correctly

controlled with a thermostatic blending valve limiting the

temperature of the circuits to approximately 50°C with 1000mm

(minimum) length of copper or steel pipe connected to the boiler,

and a 20K differential must be maintained at the appliance.

Primary system/connections/valves:

• Do not use galvanised pipes or radiators.

• All system connections, taps and mixing valves must be capable of

sustaining a pressure of 3 bar.

• Radiator valves should conform to BS 2767:10.

• All other valves should conform to BS 1010.

• An automatic bypass valve must be connected between the heating

flow and return where TRVs are used on all radiators, fitted to give at

least a 3 metre circuit when activated.

• Drain cocks are required at all the lowest points on the system.

• Air vents are required at all high points on the system.

Open vent primary system (Regular only)

• The open vent pipe (F) and feed and expansion pipe (H) must rise

continuously from the appliance.

• The feed and expansion cistern (E) must be positioned to provide a

static head (S) of at least 1 metre above the highest point in the

heating system to the water level in the feed and expansion cistern.

• Ensure adequate space is left in the expansion cistern for expansion

of the system water.

• No valve shall be fitted in the open vent pipe (F) or the feed and

expansion pipe (H).

• The open vent pipe (F) must be at least 22mmØ.

FUEL FLOW RATE

2.5kg/h 5kg/h 10kg/h 10kg/h

Head (m) 8mmØ 8mmØ 8mmØ 10mmØ

010055 26 100

0.5 95 45 23 100

1.0 80 40 20 90

1.5 70 35 17 75

2.0 60 30 14 65

2.5 45 25 11 50

3.0 35 15 8 35

3.5 25 10 5 20

6720813288-03.1Wo

NOTICE:

▶ The boiler should not be allowed to operate with a

return temperature of less than 30°C when the

system is up to operating temperature.

Oil burners cannot modulate to accommodate a

reduction in heating loads. If the heating load can be

significantly reduced due to TRV’s or zoning of the

heating circuits, consideration should be given as to how

short cycling of the burner could be prevented.

Burner run times should remain greater than 2 minutes

during normal operation.

A buffer vessel or thermal store should be considered to

help prevent excessive short cycling of a single

appliance, or a low loss header could be used to divide

the heating duty between multiple lower output

appliances.

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