Minimiser
- Installation
6
GENERAL
Table 4 - Water flow rate and pressure loss
IMPORTANT
. It is absolutely ESSENTIAL to ensure, in
practice, that products of combustion discharging from the
terminal cannot re-enter the building or any other adjacent
building through ventilators, windows, doors, other sources of
natural air infiltration, or forced ventilation / air conditioning.
If this should occur the appliance MUST be turned OFF, labelled
as 'unsafe' and corrective action taken.
TERMINAL
The terminal assembly can be adapted to accommodate various
wall thicknesses. Refer to Frame 11 - Unpacking.
AIR SUPPLY
It is NOT necessary to have a purpose-provided air vent in the
room or internal space in which the boiler is installed. Neither is
it necessary to ventilate a cupboard or compartment in which
the boiler is installed, due to the low surface temperatures of
the boiler casing during operation; therefore the requirements
of BS 6798, Clause 12, and BS 5440:2 may be disregarded.
WATER CIRCULATION SYSTEM
The boiler must NOT be used for direct hot water supply. For the
types of system and correct piping procedure see
Frames 1
and 3 to 8.
The central heating system should be in accordance with
BS. 6798 and, in addition, for smallbore and microbore systems,
BS. 5449.
WATER TREATMENT - see Frame 9
The hot water storage cylinder MUST be of the indirect type
and should preferably be manufactured of copper.
Single feed, indirect cylinders are not recommended and
MUST NOT be used on sealed systems.
The appliances are NOT suitable for gravity central heating nor
are they suitable for the provision of gravity domestic hot water.
The hot water cylinder and ancillary pipework, not forming part
of the useful heating surface, should be lagged to prevent heat
loss and any possible freezing - particularly where pipes run
through roof spaces and ventilated underfloor spaces.
The boiler must be vented.
Draining taps MUST be located in accessible positions, which
permit the draining of the whole system - including the boiler
and hot water storage vessel. They should be at least
1/2
" BSP
nominal size and be in accordance with BS. 2879.
The boiler is fitted with a special drain plug which is provided to
drain the BOILER ONLY in the event of the system drain plug
being unable to do so.
The hydraulic resistance of the boilers, at MAXIMUM OUTPUT,
with an 11
0
C (20
0
F) temperature differential, are shown in
Table 4.
Boiler size
FF30
FF40
FF50
FF60
FF70
FF80
Boiler
kW
8.8
11.7
14.7
17.6
20.5
23.4
Output
Btu/h 30,000 40,000 50,000 60,000 70,000 80,000
Water Flow
l/sec 0.19
0.25
0.32
0.38
0.44
0.51
Rate
gpm
2.5
3.3
4.2
5.0
5.8
6.7
Pressure
kPa
4.2
6.7
10.0
13.7
11.2
13.7
Loss
m
0.4
0.7
1.0
1.4
1.2
1.4
ft
1.4
2.3
3.3
4.6
3.8
4.6
THERMOSTATIC RADIATOR VALVES (TRV)
Caradon Ideal Ltd.
recommend 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 as stated in BS. 5449.
When thermostatic radiator valves are used, the space heating
temperature control over a living area having a heating
requirement of at least 60% of the boiler heat output should be
achieved using a room thermostat whilst other rooms are
individually controlled by thermostatic radiator valves. A higher
proportion of TRVs may be used, provided that a bypass
between the boiler flow and return is fitted, to ensure adequate
flow when all TRVs are closed - however this is NOT
recommended as a large proportion of TRV's can restrict water
circulation and inhibit the condensing mode of condensing
boilers, reducing fuel economy.
For further information refer to the 'Good Practice Guide 143',
publication of the Energy Efficiency Office, available from the
Building Research Establishment, Garston, Watford WD2 7JR.
Tel: 01923 664 258
ELECTRICAL SUPPLY
Wiring external to the appliance MUST be in accordance with the
current I.E.E. (BS7671) Wiring Regulations and any local
regulations which apply.
The point of connection to the mains should be readily
accessible and adjacent to the boiler, except for bathroom
installations where the point of connection to the mains MUST be
situated outside of the bathroom.
Note
.
Where a room sealed appliance is installed in a room
containing a bath or shower then the appliance and any
electrical switch or appliance control utilising mains electricity
should be so situated that it cannot be touched by a person
using the bath or shower. See Frame 34 for details.