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WATER IN CENTRAL HEATING SYSTEMS
Detail
Maximum rated heat input
Minimum rated heat input
Domestic hot water maximum rated thermal input (80-60)
Domestic hot water minimum rated thermal input (80-60)
PARAMETER
Seasonal heating energy efficiency class
Water heating energy efficiency class
Rated input
Seasonal energy efficiency in central heating mode
USEFUL HEAT OUTPUT
at rated thermal input and at high temperature rating
at 30% of rated thermal input and at low temperature rating
EFFICIENCY
at rated thermal input and at high temperature rating
at 30% of rated thermal input and at low temperature rating
ADDITIONAL ENERGY CONSUMPTION
at full load
at partial load
in stand-by
OTHER PARAMETERS
Heat loss in standby mode
Energy consumption of the pilot light
Annual energy consumption
Level of inner sound power
Emissions of nitrogen oxides
FOR COMBINATION HEATING APPLIANCES
Declared load profile
Energy efficiency in DHW mode
Daily electrical energy consumption
Daily fuel consumption
Annual electrical energy consumption
Annual fuel consumption
14 WATER IN CENTRAL HEATING SYSTEMS
INTRODUCTION
Water used in central heating systems MUST be suitably treated
to ensure the correct functioning of those systems and to guar-
antee an extended working life for boilers and all other system
components. This applies not only to existing systems but to
newly installed systems too.
Sludge, lime-scale and pollutants present in the water can cause
permanent damage to the heating unit, also within a short time
and regardless of the quality standards of the materials used.
Contact the Technical Assistance Service for any further informa-
tion on type and use of additives.
9
Always conform to the standards and legislation applicable
in the country of installation.
150
166
16,6
-
-
-
-
Prated
146,6
ηs
-
P4
146,6
P1
54,1
η4
88,3
η1
97,9
El max
200
El min
60
PSB
4
Pstby
1466
Ping
-
Q HE
-
LWA
-
NOx
-
-
ηWH
-
Qelec
-
Qfuel
-
AEC
-
AFC
-
WATER IN CENTRAL HEATING SYSTEMS.
INSTRUCTIONS FOR THE DESIGN, INSTALLATION AND MANAGEMENT
OF CENTRAL HEATING SYSTEMS.
1. Chemical and physical characteristics of water
The chemical and physical characteristics of water used in cen-
tral heating systems must conform to the requirements of EN
14868 standard and to the following tables:
with furnace power < 150 kW
ph
Hardness
°fH
Electrical
µs/cm
conductivity
Chlorides
mg/l
34
225
300
249
332
16,6
17
-
-
-
-
-
-
-
-
219,9
146,6
-
-
219,9
146,6
81,2
108,2
88,3
88,3
97,9
97,9
300
400
90
120
6
8
2199
2932
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
STEEL BOILERS
Initial filling
Regular service
water
water (*)
6-8
7,5-9,5
< 10°
< 10°
< 150
< 20
U.M.
kW
kW
kW
kW
-
-
kW
%
kW
kW
%
%
W
W
W
W
W
GJ
dB
mg/kWh
-
%
kWh
kWh
kWh
GJ
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