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CONTENTS
I.
GenerallnformatJon
II.
Electrical
2.
Technical Data
12. Removal of Cabinet
3. Dimensions and Wall Preparation
13.
lnstallatJOn
4.
Siting the Appliance
14.
Commissioning the Appliance
5. Flue
15.
Users Instructions
6. Arr Supply
16.
Routine Cleamng and Inspection
7.
System Considerations
17.
Replacement of Parts
8.
Sealed Primary System
18.
Short Parts List
9.
Open Vent Pnmary Systems
19.
Fault Fmdmg
10.
Domestic Water Supply
1.
GENERAL INFORMATION
See Fig. 1
1.
THE HIGHFLOW 4.5 INCORPORATES:
(a)
An open flued low thermal capacity boiler having a maximum
heat output of 22.9 kW (78,000 Stu/hi
(b) A heatbank having a nominal capacity of 92litres (21 gallons)
of circulating primary hot water and positioned at the side of
the appliance. A copper finned water to water heat exchanger
is fitted into the heat bank. Secondary mains supply domestic
hot water passes through the heat exchanger.
{c)
A diverting valve to direct the boiler output either to domestic
hot water or central heating as required.
{d) Two mtegral circulating pumps.
(e)
A multifunctional gas valve and electrical control system to
individually control the domestic hot water and central
heating.
(f)
Boiler and hot water temperature control thermostats
providmg control for central heating and domestic hot water.
(g) An Operating Switch for selection of water only or central
heating and water. A programmer kit is available as an
optional extra
(h) An expansion vessel, pressure gauge, pressure release valve
and auto air vent to enable the appliance to be connected to a
sealed water system.
{i)
An electronic pump delay control board which enables the
central heating pump to run on for a period of about 5 minutes
after each operating cycle.
2.
THE HEATING SYSTEM
The appliance is supplied for connection to a sealed system.
IMPORTANT: The pipe connections made throughout the
system must be capable of sustaining a pressure of up to 3 bar.
when the appliance is fitted to an existing installation and that
system ts upgraded to a sealed system then the water connec-
tions must be checked and replaced if necessary
If thermostatic radiator valves are to be fitted to the system
then they must conform to the requirements ofBS 276 7:1972.
A combined cold feed and vent pipe connection is available for
use when the boiler is fitted to an open vented system. See Fig.
2. Provision is made in the top panel for access.
INSTALLATION REQUIREMENTS
The installation of this appliance must be in accordance with the
relevant requirements of the Gas Safety (Installation and Use)
Regulations, local Building Regulations, Building Standards
(Scotland) {Consolidation), current lEE wiring regulations and bye
laws of the local water undertaking.
It
should be in accordance
with the relevant recommendations of the following British
Standards and Codes of Practiceo BS 6798:1987, BS 5449:1:1990,
BS 5546:1:1990, BS 5440:1:1990, BS 5440:2:1989 and BS 6891.
Gas Safety (Installation and use) Regulations 1984: It is the law that
all gas appliances are installed by a competent person, in
accordance with the above regulations. Failure to install appliances
correctly could lead to prosecution. It is in your interest, and that of
safety, to ensure compliance with the law.
The manufacturers notes must not be taken,
tn
any way, as
overriding statutory obligations.
3.
2
NATURAL GAS SUPPLY
The boiler requires 2.8 m
3
/h (98.5
ft
3
/hr) of gas. The gas meter
and supply pipes must be capable of supplyrng this quantity
of gas in addition to the demand from any other appliances
being served. It is recommended that a 22 mm dia. supply
pipe is used up to the appliance. Under no circumstances
should the size of the gas supply pipe be less than that of the
appliance inlet connection (22 mm diameter). The meter outlet
governor must ensure a nominal pressure of20 mbar (8 in.wg.)
at the appliance. The complete installation, including the
meter, should be inspected and tested for soundness and
purged in accordance with the recommendations of BS 6891.
Fig. 1 . Appliance water flow diagram.
Flow-
- -
- - - -
regulators
Comb1ned cold feed
and vent p1pe
I
Open vent pnmary
systems onlyl
Bmler heat exchanger
Bo11ersec110n
lrrnnnuuu,
Bumer
:3ealed system
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