Technical data

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ALPHA700

12.0 system schematic

using reverse/return

It is important to ensure that for all Alpha single and multi-boiler installations, the system should be

designed to provide an even flow of water through each boiler when the burner is firing, and that this flow

rate is not less than the minimum flow rate shown for each size of boiler in the technical data.

On multi-boiler installations, even flow can be achieved by connecting the boilers to the water flow and

return pipework using a reverse return method of connection.

This will provide an even water flow through each boiler and ensure that the pressure loss across any

number of boilers is never greater than that for a single boiler plus adjacent pipework losses.

Constant Temp. Circuit

Primary

Circulating

Pump

3-Way Vent Valve

Gate

Valve

Boiler

No.1

No.2

No.3

Water

Sensor

Zone

Controls

Thermometer

Open Vent

Safety Valve

Boiler Sequence Controller

Zone 2

Zone 1

Mixing Valve

It is desirable to prohibit flow of water through a non firing boiler in a multiple boiler bank. One such

way is to install divertor valves and boiler bypass as shown below.

If this option is to be followed, then overrun timers must be incorporated into the control scheme to

allow any latent heat contained within the boilers to be scrubbed off before by-passing a boiler via the

operation of the divertor valve.

13.0 system schematic

using diverter valves