8
Henrad SE FF
- Installation
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
o
C (20
o
F) temperature differential, is shown in
Table 4.
Boiler size
SE30FF SE40FF SE50FF SE60FF SE70FF SE80FF
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 Plumbing 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 TRVs 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. (BS.7671) 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.
CONDENSATE DRAIN.
Refer to Frame 44
A condensate drain is provided on the boiler. This drain must be
connected to a drainage point on site. All pipework and fittings in
the condensate drainage system MUST be made of plastic -
no
other materials may be used.
IMPORTANT.
Any external runs must be insulated
The drain outlet on the boiler is standard
3/4
" (22 mm) overflow
pipe.
Summary of Contents for Henrad SE 30 FF
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