Operating instructions

11
HEATING SYSTEM DESIGN
● The ECOSY boilers are compatible with any type
of installation.
● Heating surfaces may consist of radiators, con-
vectors or fan assisted convectors.
● Pipe sectional areas shall be determined in ac-
cordance with normal practices, using the output/
pressure curve (diagram 3). The distribution system
shall be calculated in accordance with the output
requirements of the actual system, not the maxi-
mum output of the boiler. However, provision shall
be made to ensure sufficient flow so that the tem-
perature difference between the flow and return
pipes be less than or equal to 20°C. The minimum
flow is 400 l/h.
● The piping system shall be routed so as to avoid
any air pockets and facilitate permanent venting
of the installation. Bleed fittings shall be provided
at every high point of the system and on all radia-
tors.
● The total volume of water permitted for the heat-
ing system depends, amongst other things, on the
static head in the cold condition. The expansion
vessel on the boiler is pressurised at :
Ecosy 24 E/28 E : 0,5 bar (corresponding to a static
head of 5 m w.g.) and allows a maximum system
volume of 150 l.
Ecosy SB 24 E/SB 28 E : 1 bar (corresponding to a
static head of 10 m w.g.) and allows a maximum
system volume of 215 l,
for an average temperature of 75°C and a maxi-
mum service pressure of 3 bar. This pressure setting
can be modified at commissioning stage if the static
head differs. An additional expansion vessel can be
fitted to the system if required, see diagram 8.
● Provision shall be made for a drain valve at the
lowest point of the system.
● Where thermostatic radiator valves are fitted, not
all radiators must be fitted with this type of valve,
and in particular, where the room thermostat is in-
stalled.
● In the case of an existing installation, it is ESSEN-
TIAL that the system is thoroughly flushed prior to in-
stalling the new boiler using a propietary cleanser
such as Sentinel X 400 . In addition, it is recom-
mended that an inhibitor Sentinel X 100 , is added
to the system in accordance with the recommen-
dations of Betz-Dearbourn Ltd., Foundry Lane
Widnes, Cheshire WA8 8UD.
Filling the system
Provision must be made for filling the system at low
level. The use of a WRC approved filling loop is
strongly recommended, connected as shown in dia-
gram 8.
Diagram 8
Flow
control valve
Drain point
Filling device
Bypass
valve
Domestic
water
Heating
circuit
Return
Additional
expansion
vessel
(if required)
Boiler
Hot
Cold supply
Sch 173a