Technical data

ManualsBrandsMain ManualsHome building and DecorMULTIPOINT FF

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 mom or internal space 258 cm2 (40 in2) 258 cm* (40 irL2)

Air direct from outside

129 cm2 (20 in.2) 129 ails (20 in*)

2.8

Electrical Connections

The appliances must be earthed.

The installation should be undertaken by a competent

electrician 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 (U

blue wire to neutral (N) and green/yellow to earth ( ),

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.

2.9

Description of Operation

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 3,6,2).

Read in conjunction with figs 1. 2 and 4).

The controls on the BRITONY II FF are comprised of a ran-

ge of thermal, electric and electronic switches. Broadly, the

thermal controls are for the pilot flame supervision, the

electrical controls are functional switching and the electro-

nic 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 connection is made since it is dependent upon the

energising of relay-RLI.

If the air flow is not proved on high speed the flame failure

device will operate by interrupting the thermocouple as a

result of the failure of the circuit through relay-RLI.

Additional security is provided for the condition where,

because the linkage is mechanical, the main gas burner is

initiated but the microswitch has remained in the low fan

speed position. If the burner is sensed in the low fan

speed circuit the appliance fails safe.

ELECTRIC SUPPLY

FUNCTIONAL FLOW DIAGRAM

THERMOSTAT ’

FAN

THERM0

MICRO SWITCH

RELAY

- RL2

i RELAY L

RLl

r ’

COUPLE -t ELECTR’C

VALVE

SAS VALVE