2.7
Air supply
The appliance does not require any purpose provided
ventilation unless installed in a compartment. A compart-
ment enclosing an appliance requires high and low level
openings. These openings must either communicate with
a room or internal space or be direct to outside air. The
minimum FREE area of the opening must be :
High level Low level
Air from room or internal space
258 cm* (40 in.2)
258 cm* (40 mz)
Au direct from outside 129 cm2 (20 in.*) 129 cm* (20 in.2)
2.8
Electrical Connections
The appliances must be earthed.
The installation should be undertaken by a competent
electrrcian and should be In accordance with the current
edition of the IEE Wiring Regulations.
Particular attention should be paid to cross bonding.
The appliance must be provided with a means of isolation.
If installed In a bathroom the means of isolation must be
external to the bathroom or a double pole cord switch fit-
ted.
Acceptable methods of connection are :
1 A switched, double pole fused spur with 3 mm contact
separation on all poles.
2. A double pole switch where the supply must be suita-
bly fused 3 A.
3. An un-switched socket outlet compling with BS 1363.
The method of connecting the plug brown wire to live (L)
blue wire to neutral (N) and green/yellow to earth (4).
see fig. 3.
A three core cable should be used and a heat resisting ca-
ble of 0.75 mm2 (24 x 0.2 mm) is considered suitable.
The cable should be passed through the gland on the top
of the appliance and the clamp tightened to secure the
cable. Ensure current carrying conductors become taught
before earthing conductor should cable slip from the
cord anchorage. Connection to the appliance should be
made in accordance with diagram (see section 3,8,2).
2.9
Description of Operation
Read in conjunction with figs 1, 2 and 4).
The controls on the Britony FlexiFlue comprise of a range
of thermal, electric and electronic switches. Broadly, the
thermal controls are for the pilot flame supervision, the
electrical controls are functional switching and the elec-
tronic controls act as a security for the functional
controls.
The circuit is designed so that, under normal conditions,
the fan runs continuously at low speed and automatically
changes to high speed when the gas valve opens. If,
however, the incoming air temperature approaches 0 “C
the integral frost protection thermostat interrupts the
low fan speed signal. Under this condition, if there is a de-
mand for hot water, then the fan recommences at high
speed. There is an in-built delay circuit to prevent the
safety devices operating,prematurely.
The pilot can only be established under the control of the
thermocouple flame failure circuit after the mains electri-
city connectlon is made since it is dependent upon the
energising of relay-RLI.
Iftheairflowisnot provedon highspeedtheflamesupervision
device will operate by interrupting the termocouple as a
result of the de-energising relay-RLl
ELECTRIC SUPPLY
FUNCTIONAL FLOW DIAGRAM
THERMOSTAT
FAN
t-t
PRESSURE
SWITCH
-
I
1r
,
MICRO SWITCH
L
RELAY
THERM0
L
RELAY
L
THERM0
r
RL2
r
RLl
r
COUPLE + ELECTRIC
4 .
VALVE
GAS VALVE
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