Air Supply; Electrical Supply; Water Circulation System - Excel HE C24 User Manual

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

IMPORTANT.
A minimum length of 1 metre of copper pipe MUST be fitted
to both flow and return connections from the boiler before
connection to any plastic piping.
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 6
BOILER CONTROL INTERLOCKS
Ideal Stelrad Group 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.
Central heating systems controls should be installed to
ensure the boiler is switched off when there is no demand for
heating or hot water.
3 SYSTEM REQUIREMENTS - Central Heating
Notes
a. The method of filling, refilling, topping up or flushing sealed
primary hot water circuits from the mains via a temporary
hose connection is only allowed if acceptable to the local
water authority.
b. Antifreeze fluid, corrosion and scale inhibitor fluids suitable
for use with boilers having copper heat exchangers may be
used in the central heating system.
Advice should be sought from a local water treatment
company.
General
1. The installation must comply with all relevant national and
local regulations.
2. The installation should be designed to work with flow
o
temperatures of up to 82 C.
3. All components of the system must be suitable for a
working pressure of 3 bar and temperature of 110
care should be taken in making all connections so that the
risk of leakage is minimised.
The following components are incorporated within the
appliance:
a. Circulating pump.
b. Safety valve, with a non-adjustable preset lift pressure
of 3 bar.
c. Pressure gauge, covering a range of 0 to 4 bar.
d. A 7-litre expansion vessel, with an initial charge
pressure of 0.75 bar.
10
GENERAL
When thermostatic radiator valves are used, the space heating
temperature control over a living / dining area or hallway having
a heating requirement of at least 10% of the boiler heat output
should be achieved using a room thermostat, whilst other
rooms are individually controlled by thermostatic radiator valves.

ELECTRICAL SUPPLY

WARNING.
This appliance must be earthed.
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. For IE reference should be made to
the current ETCI rules for electrical installations.
The point of connection to the mains should be readily
accessible and adjacent to the boiler.
CONDENSATE DRAIN
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 21.5mm (3/4")
overflow pipe.
Safety valve setting
Vessel charge pressure
System pre-charge pressure bar
System volume
For other system volumes
multiply by the factor across
o
C. Extra
4. 'Make-up' Water. Provision must be made for replacing
water loss from the system, either :
a. From a manually filled 'make-up' vessel with a readily
visible water level. The vessel should be mounted at
least 150mm above the highest point of the system and
be connected through a non-return valve to the system,
fitted at least 150mm below the 'make-up' vessel on the
return side of the radiators.
or
Refer to Frame 27
bar 3.0
bar 0.5 to 0.75
None
Expansion vessel
(litres) volume (litres)
25 1.6
50 3.1
75 4.7
100 6.3
125 7.8
150 9.4
175 10.9
190 11.9
200 12.5
250 15.6
300 18.8
0.063
continued . . . . . .
excel HE -
Installation and Servicing
1.0
1.8
3.7
5.5
7.4
9.2
11.0
12.9
14.0
14.7
18.4
22.1
0.074