Fabdec EXCELSIOR Installation Manual - page 4
4
STANDARD ENERGY LOSSES
The heat loss of each Excelsior Unvented Unit while
maintaining the temperature of the stored water at 65 degrees
Celsius. (See performance table below).
1) Tests carried out by BBA. Slight variations may occur with
changes to water mains supply pressure
Excelsior Performance
Nominal
Heat up
Heat up
Reheat
Reheat
Heat loss in
Capacity Model IDH Model DH Model IDH Model DH
24 hrs
Litres
Mins
Mins
Mins
Mins
kw/hr
80
33
64
23
53
1.12
130
28
115
21
90
1.50
150
33
138
24
104
1.82
175 27
167
24
124
2.10
215
35
212
30
153
2.64
255
42
263
35
184
2.73
305
50
313
42
220
2.88
SITING THE EXCELSIOR UNIT
The unit can be placed anywhere convenient. Because it is
connected directly to the mains water supply it is equally efficient
on any floor – ground, first or second. Avoid areas that may be
subject to frost. Try to keep pipe runs as short as possible for
maximum economy, especially hot water discharge pipes running
down from the Excelsior unit.
The unit can be fitted into a conventional airing cupboard and
does not require any additional insulation.
ALL EXCELSIOR UNITS MUST BE STORED VERTICALLY
CHECK WATER PRESSURE & FLOW RATES
We suggest 1.5 bar pressure & 15 litres / minute flow rate to be the
minimum requirements for satisfactory operation. Less than this
the unit will still operate but you will not be able to run two, or
more, outlets at the same time. 85% of all U.K homes have more
than 2-bar pressure.
The mains supply must not exceed 16 bar. If it does a special
pressure-reducing valve will be required.
Important Note: - Stainless Steel Tectile push fit elbows are fitted
as standard to all Excelsior Cylinders.
●
1 Element on IDH indirect models up to 305 litres and 80 litre
DH direct model
●
2 Elements on DH direct models from 130 up to 305 litres.
Additional elements from 215 to 305 litres are available on
request.
●
Cold-water control valve comprising line strainer, check valve,
pressure reducing valve set to 3 bar
●
Expansion relief valve with non return valve set at 6 bar
●
Tundish 15mm x 22mm F x F
●
Temperature / Pressure relief valve set at 90 degrees Celsius
and 7 bar pressure relief (factory fitted)
●
Motorised valve (indirect units only)
●
Cylinder thermostat-factory fitted to cylinder, maximum setting
85 degrees Celsius (indirect units only)
●
Thermal cut out set to operate at 87 degrees Celsius plus or
minus 3 degrees (indirect units only)
●
Expansion vessel capacity ranges as shown in the table below: -
Tank Size
80 to 130 Litres
150 to 215 Litres
255 to 305 Litres
Expansion Tank Required
12 Litres
18 Litres
25 Litres
2) These figures relate to a 45 degree differential between the
stored water and ambient temperature
WITH AN EXCELSIOR UNVENTED CYLINDER
THE FOLLOWING IS SUPPLIED AS STANDARD
Before commencing installation check that all the components of
your Excelsior Unit are contained in the kit.
●
3KW Incoloy 825 heating element-incorporating thermostat to
70 degrees Celsius and resetable safety cut out set at 80
degrees Celsius
EXCELSIOR UNVENTED INSTALLATION INSTRUCTIONS
WARNING
: Under no circumstances must the factory fitted temperature pressure relief valve be removed. This will totally invalidate any
guarantee or claim. The cold-water inlet valve assembly must be fitted or the Excelsior unit will not perform satisfactorily.
DO NOT ATTEMPT TO VENT THE PRIMARY CIRCUIT THROUGH THE EXCELSIOR UNIT.
All boilers should be installed to manufacturers instructions and the primary circuit through the Excelsior unit must be pumped.
1845 Tech Manual.qxd 23/11/05 1:22 pm Page 5