Double Pipe Sub-Gravity Feed System; Single Pipe Suction Lift With De-Aerator; Pipework; Boiler Isolation Valve - Bosch WORCESTER Greenstar Danesmoor 18/25 Installation, Commissioning And Servicing Instruction Manual
Floor standing oil-fired condensing boiler conventional flue & room sealed flue
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Pre-Installation
4.3.2
Double pipe sub-gravity feed system:
Maximum suction height 3.5 metres. Non-return valves must be fitted to
the inlet and return oil line between the oil pump [9] and oil storage tank
[1].
1
11
150mm
2
3
4
Fig. 8
Double pipe feed
Maximum pipe run for double pipe sub-gravity fed system
Head (m) 10mmØ 12mmØ
0
50
100
0.5
44
100
1.0
38
95
1.5
32
80
4.3.3
Single pipe suction lift with de-aerator:
Maximum suction height 3.5 metres. The oil tank [1] must be positioned
below the oil pump [9]. Create an inlet and return loop between the de-
aerator [12] and oil pump [9].
A non-return valve must be incorporated within the de-aerator or fitted
to the oil line between the oil storage tank [1] and the de-aerator [12].
A top feed oil tank fitted with a de-aerator using an internal non-return
valve should have any non-return valves fitted in the base of the tank to
the suction line removed to assist purging air from the oil line.
1
2
3
4
Fig. 9
De-aerator feed
Maximum pipe run for single pipe suction lift with de-aerator
2.5kg/h
5kg/h
Head (m)
8mmØ
8mmØ
0
100
55
0.5
95
45
1.0
80
40
1.5
70
35
2.0
60
30
2.5
45
25
3.0
35
15
3.5
25
10
The table and illustration above is a guide only and does
not in any way override the de-aerator manufacturer's
instructions
14
6
8
5
9
10
3
7
13
6720813284-09.2Wo
Head (m) 10mmØ 12mmØ
2.0
26
66
2.5
20
50
3.0
14
37
3.5
8
22
12
6
8
9
10
5
3
7
13
FUEL FLOW RATE
10kg/h
10kg/h
8mmØ
10mmØ
26
100
23
100
20
90
17
75
14
65
11
50
8
35
5
20
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].
1
5
4
3
Fig. 10 Isolation valve bracket removed for clarity
▶ Use flexible hoses to connect from the boiler isolation valve/s to the
oil pump.
Greenstar Danesmoor Kitchen
ErP+
and Kitchen System
2
ErP+
-6 720 821 686 (2018/04)
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