12
Response FF80
- Installation
Boiler
FF80
Max CH Output
kW
17.6
(Btu/h)
(60 000)
Water flow rate
l/sec
0.382
(gal/min)
(5.04)
Temperature
o
C
11
differential
(
o
F)
(20)
Head available for
m.w.g.
2.75
system pump, pos.3
(ft.w.g.)
9.0
GENERAL
7. Thermostatic radiator valves.
Caradon Ideal Limited
support the recommendations
made by leading manufacturers of domestic heating
controls that heating systems utilising full thermostatic
radiator valve control of temperature in individual rooms
should also be fitted with a room thermostat controlling the
temperature in a space served by radiators not fitted with
such a valve. Such an arrangement will provide for a more
efficient control of the environment and will also avoid the
continuous running of the circulation pump during
programmed heating ON periods, saving electrical energy.
It is therefore strongly recommended that, when
thermostatic radiator valves are used, the space heating
temperature control over a living/dining area or a hallway,
having a heat requirement of at least 10% of the boiler
output, is achieved using a room thermostat whilst other
rooms are individually controlled by thermostatic radiator
valves.
However, if thermostatic radiator valves are fitted to
all
radiators then a bypass MUST be fitted. This should
consist of 22mm (
3/4
") pipe for the FF 80 positioned as far
from the boiler as possible and incorporating a balancing
valve
which cannot be adjusted by the householder.
For adjustment refer to Frame 45
a.
The total length of pipework
A, B, C & D
MUST NOT
be less than 3m (10') and must not include any other
valves.
b.
The balancing valve MUST be at least one turn open.
8. Hydraulic resistance
Having subtracted the hydraulic resistance of the boiler the
head available to overcome system resistance at
MAXIMUM CENTRAL HEATING OUTPUT, with an 11
0
C
(20
0
F) temperature differential, is shown in Table 7.
9. Draining the system
Draining taps MUST be located in accessible positions to
permit the draining of the whole central heating system,
including the central heating side of the boiler. The taps
should be at least
1/2
" BSP nominal size and be in
5
SEALED SYSTEM REQUIREMENTS - Central Heating - continued
1.
The domestic hot water service must be in accordance
with BS 5546 and BS 6700.
2.
For the minimum and maximum working pressures of the
FF80 domestic hot water circuit refer to Table 1, page 3.
3.
The cold water supply pipe should be flushed before fitting
the boiler.
4.
The boilers are suitable for connection to most types of
washing machine and dishwashing appliances.
6
DOMESTIC HOT WATER REQUIREMENTS
Table 7 - Water Flow Rate and Pressure Loss
5.
When connecting to suitable showers, i.e. those designed
for modulating domestic hot water, ensure that:
a.
The cold inlet to the boiler is fitted with an approved
anti-vacuum or syphon non-return valve.
b.
Hot and cold supplies are of equal pressure.
6. Hard water areas
In areas where the water is 'hard' it is recommended that a
proprietary scale-reducing device is fitted into the boiler
cold supply - within the requirements of the local water
company.
accordance with BS 2879. The boiler flow and return
service valves (fitted to the piping frame) have drain
plugs to drain the BOILER ONLY, in the event of the
system drain tap being unable to do so.
