PRE-INSTALLATION
6 720 815 725 (2015/05)10
3 PRE-INSTALLATION
3.1 CLEANING PRIMARY SYSTEMS
BEFORE CLEANING THE SYSTEM:
▶ Ensure that the system and pipe work is in good working order.
▶ Where possible keep the existing boiler/circulating pump in
place when flushing the system.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
FLUSHING THE SYSTEM
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ Run the boiler/system at normal operating temperature as directed
by the manufacturer of the flushing agent.
Product data Symbol Unit 7 738 100 252 7 738 100 253 7 738 100 246 7 738 100 247
Product type – – 38CDi
Classic
ErP
38CDi
Classic
ErP
LPG
42CDi
Classic
ErP
42CDi
Classic
ErP
LPG
Condensing boiler – – Yes Yes Yes Yes
Combination heater – – Yes Yes Yes Yes
Rated heat output P
rated
kW 30 30 30 30
Seasonal space heating energy efficiency
s
%9292 9292
Energy efficiency class – – A A A A
Useful heat output
At rated heat output and high temperature regime
1)
1) High temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
P
4
kW 30.0 30.0 30.0 30.0
At 30 % of rated heat output and low temperature
regime
2)
2) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).
P
1
kW 10.0 10.0 10.0 10.0
Useful efficiency
At rated heat output and high temperature regime
1)
4
% 88.2 88.2 88.2 88.2
At 30 % of rated heat output and low temperature
regime
2)
1
% 97.5 97.5 97.5 97.5
Auxiliary electricity consumption
At full load el
max
kW 0.052 0.052 0.052 0.052
At part load el
min
kW 0.028 0.028 0.028 0.028
In standby mode P
SB
kW 0.004 0.004 0.004 0.004
Other items
Standby heat loss P
stby
kW 0.048 0.048 0.048 0.048
Emissions of nitrogen oxides NOx mg/kWh 20 20 20 20
Sound power level, indoors L
WA
dB(A) 55 55 55 55
Additional data for combination heaters
Declared load profile – – XL XL XL XL
Daily electricity consumption Q
elec
kWh 0.171 0.171 0.171 0.171
Annual electricity consumption AEC kWh 38 38 38 38
Daily fuel consumption Q
fuel
kWh 22.388 22.388 22.377 22.377
Annual fuel consumption AFC GJ 1,368 1,368 1,367 1,367
Water heating energy efficiency
wh
%8484 8787
Water heating energy efficiency class – – A A A A
Table 7 Product data for energy consumption
NOTICE:
▶ All the following Pre-Installation sections must be
read and requirements met before starting boiler or
flue installations.
CAUTION:
▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
NOTICE:
▶ Debris from the system can damage the boiler and
reduce efficiency. Failure to comply with the
guidelines for the use of water treatment with the
appliance will invalidate the appliance guarantee.
NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT
BE USED TO FILL THE CENTRAL HEATING SYSTEM.
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