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A flow restrictor is fitted within the appliance which limits a hot

water delivery rate to a maximum of 18 (±15%) litres/minute (4.0 gal-

lons/minute).

The restrictor is removed by the installer if a cistern feed hot

water system is installed.

Hot Water and Central Heating mode:

When a demand is made for heating by the system controls (i.e.

a programmer or room thermostat).

The water diverter valve will open, the pump will energise circu-

lating primary water around the heating system and the burner will

light. The heat output from the appliance in this mode will have been

set by the installer to match the requirements of the system. The

appliance will operate as necessary to maintain the temperature of

the radiators at the level set by the adjustment of the Heating

Temperature Control Knob. (See Fig. 2.)

If the system no longer requires output to maintain the desired

room temperature, the burner will extinguish. The pump will contin-

ue to run for a short period to dissipate the residual heat from the

appliance and then switch off.

The appliance will supply heat to the central heating system as

required. A demand for hot water at a tap or shower will override the

central heating function for the period of the domestic hot water

demand.

When domestic hot water

is no longer required the burner

and pump will continue to oper-

ate until the heatbank is back to

the required temperature.

The appliance will return

to the central heating state and

its normal mode of operation.

Similarly the hot water is

occasionally diverted from the

central heating system into the

heatbank to maintain the stored

primary hot water temperature.

NOTE: If in doubt about

the use of the controls ask your

installer to assist you.

Fig. 1. System Diagram of Highflow 400 Series.

Primary

Water

circulation

Water

diverter

valve

From

radiators

Mains

cold in

Flow

switch

Domestic hot

water out

Expansion

vessel

Slot in

front cover.

(O.F. only

Pilot obser-

vation win-

dow. (B.F.

only)

radiators

Circulating

pump

Heat

exchanger

Heatbank

Burner

Boiler

1 2 3 4 5 6 7 8 9 ... 15 16

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