7
2.2 Sealed System Data - Sealed System Models
15/21, 21/26, 26/35
Heating system pressure (cold) Maximum 1.0 bar / Minimum 0.5 bar
Operating pressure of pressure relief valve 2.5 bar
Expansion vessel size (pre-charged at 1 bar) 12 litres
Max. heating system volume (including boiler)* 128 litres - approximately
Cold water mains connection 15 mm copper pipe
Pressure relief valve discharge connection 15 mm copper pipe
Circulating pump head 7 m
* Based on vessel charge and system cold fill pressure of 0.5 bar
2.3 Vortex Eco Boiler Using Class C2 Kerosene
Model
and
burner
type
Heat Output SEDBUK
2009
annual
efficiency
(%)
Nozzle Oil
press.
(bar)
Smoke
No.
Burner
head
type
Burner
head/disc
setting
Fuel
flow
rate
(kg/h)
Flue
gas
temp.
(°C)
CO
²
(%)
(kW) (Btu/h)
15/21
Riello
RDB2.2
15.1 51 500
91.9
0.50/80°EH 7.0 0 - 1 T1 Disc setting B 1.29 70 - 75 11 - 12
* 18.1 61 750 0.55/80°EH 7.5 0 - 1 T1 Disc setting C 1.53 75 - 80 11 - 12
20.7 70 600 0.60/80°EH 8.5 0 - 1 T1 Disc setting C 1.78 80 - 85 11 - 12
21/26
Riello
RDB2.2
20.7 70 600
91.7
0.60/80°EH 8.5 0 - 1 T1 Fixed 1.78 85 - 90 11 - 12
* 22.7 77 500 0.65/80°EH 8.5 0 - 1 T2 Fixed 1.95 85 - 90 11 - 12
25.6 87 350 0.75/80°EH 8.0 0 - 1 T2 Fixed 2.19 90 - 95 11 - 12
26/35
Riello
RDB2.2
25.6 87 350
91.4
0.75/80°EH 8.0 0 - 1 T2 Fixed 2.19 75 - 80 11 - 12
* 30.8 105 100 0.85/80°EH 9.1 0 - 1 T3 Fixed 2.65 85 - 90 11 - 12
34.7 118 400 1.00/80°EH 8.0 0 - 1 T3 Fixed 2.93 90 - 95 11 - 12
Notes
1 The data given above is approximate only.
2 The above setting may have to be adjusted on site for the correct operation of the burner.
3 Gas Oil is not suitable for use with the Grant Vortex Eco boiler range.
4 The net flue gas temperatures given above are ± 10%.
5 When commissioning the air damper must be adjusted to obtain the correct CO
2
level.
6 * Factory settings: 15/21 - 18.1 kW, 21/26 - 22.7 kW, 26/35 - 30.8 kW.
7 The combustion door test point may be used for CO
2
and smoke readings only. Do not use this test point for temperature or efficiency readings.
8 When setting the 15/21 to 15.1 kW output the burner air adjuster disc requires repositioning. Refer to Section 10.
When setting the 21/26 to 20.7kW or the 26/35 to 25.6 kW output the combustion head must be changed. Refer to Section 11.4.
9 The installer must amend the boiler data label if the output is changed.
2.4 Flue Gas Analysis
To allow the boiler to be commissioned and serviced, the boiler is supplied with a combustion test point on the front cleaning door.
When this test point is used please note the following:
• The test point is for CO2 and smoke readings only.
• The boiler efficiency and temperature must be taken from the flue test point on high level, vertical and conventional flue adaptors.
• Concentric low level flues do not contain a test point. The temperature and efficiency readings must be taken from the flue
terminal.
2.5 Water Connections
Boiler model Flow connection Return connection
Size Fitting Supplied Size Fitting Supplied
15/21 22mm pipe Tectite elbow in fittings kit 22mm pipe Compression fitted
21/26 22mm pipe Tectite elbow in fittings kit 22mm pipe Compression fitted
26/35 22mm pipe Tectite elbow in fittings kit 22mm pipe Compression fitted
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