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6.
PREPARATION & POSITIONING
6.1 PREPARATION
6.1.1 ELECTRICAL
CONNECTIONS:
Make sure all the electrical cables are in place.
6.1.2 WATER
CONNECTIONS:
Important. A minimum length of 1 metre of copper pipe MUST be fitted to both
flow and return connections from the boiler before connection to any plastic piping.
6.1.3 The central heating system should be in accordance with BS 6798 and for small bore and microbore
systems, BS 5449.
6.1.4
I
t is important that the system is flushed thoroughly before the appliance is left to operate (as recommended
in BS 7593) in order to maintain an efficiently operating heating system and in accordance with the
Benchmark Guidance Notes on Water Treatment in Central Heating Systems. See paragraph 15.10.
6.1.5 GAS
CONNECTIONS:
Make sure the gas connections are in place.
6.1.6 Give consideration to the flue position. Pluming will occur at the terminal so terminal positions where this
could cause a nuisance should be avoided. See Figure 11.
6.1.7 Give consideration to the overall height. See section 7.
6.1.8 CONDENSE
DRAIN:
This drain must be connected to a drainage point on site. All pipework and fittings in
the condensate drainage system MUST be made of plastic - no other materials may be used.
IMPORTANT:
Any external runs must be in accordance with BS 6798. The drain outlet on the boiler is
sized for standard 21.5mm (¾”) overflow pipe.
24C
30C
TABLE 3. PERFORMANCE DATA
MAXIMUM
MINIMUM
MAXIMUM
MINIMUM
Burner CO² (%)
case off
9.3
8.3
9.4
8.6
case on
9.5
8.6
9.7
8.9
± 0.5
PERFORMANCE DATA FOR CENTRAL HEATING
CH input Q
Net
kW
17
4.4
24
4.7
Gross
kW
18.87
4.88
26.6
5.2
Gas Consumption
m³/h
1.75
0.45
2.47
0.48
CH Output
Non condensing
kW
16.76
4.83
23.4
4.58
Condensing
kW
18.48
4.27
25.6
5.17
Seasonal Ef
fi
ciency
SEDBUK 2005
A
SEDBUK 2009*
89.66
89.50
NOx Classi
fi
cation
CLASS 5 17mg/kWh
CLASS 5 34mg/kWh
Central Heating set point temperature range
20 - 82°C
PERFORMANCE DATA FOR DOMESTIC HOT WATER
DHW Input Q
NET
kW
-
24
-
31
GROSS
kW
-
26.6
-
34.4
DHW output
kW
-
24.8
-
30.3
DHW
fl
ow rate at 35°C temperature rise
l/m
-
10.1
-
12.3
DHW speci
fi
c rate
l/m
-
11.8
-
14.4
Gas rate
m³/h
3.2
* The value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been certified by a notified body.
NOTE:
Gas consumption is calculated using a calorific value of 38.7 MJ/m³ gross or 34.9 MJ/m³ nett. To obtain the
gas consumption at a different calorific value:
a. For l/s - divide the gross heat input (kW) by the gross C.V. of the gas (MJ/m³)
b. For ft³/h - divide the gross heat input (Btu/h) by the gross C.V. of the gas (Btu/ft³)
c. For m³/h - multiply l/s by 3.6
