AVDO Installation Guide.pdf

AVDO

INSTRUCTIONS

Installation and Commissioning Guide

Adjustment Procedure

The following is intended to be a simple

guide to the setting of the AVDO. As

detailed design information is rarely

available for domestic systems this

approach is usually more appropriate

than the more scientific method often

applied to the AVDA, AVDSA and IVDA

commercial by-pass valves.

1. With boiler/system cool, set AVDO to

max (0.5 bar).

2. Switch heating system/boiler/pump

on.

3. Reduce setting until AVDO is just

open (by-pass/valve starts to get hot).

4. Turn adjuster back (anti-clockwise)

one revolution (ie. valve closes).

5. AVDO will automatically open when

system flow reduces.

6. Setting can be lead-seal locked.

The AVDO is an automatic by-pass

control valve intended for use in

domestic central heating systems. Its

function is to allow a minimum flow to be

maintained through the boiler as the

water flow through the pump is reduced

by, for example, radiator thermostats.

The AVDO automatically opens and

closes dependent upon system load;

when the radiator thermostats are open

and calling for heat the AVDO remains

closed, allowing the full boiler/pump

output to circulate. As radiator

thermostats start to close so the AVDO

opens to allow a flow through the

bypass.

Specifications

Max. working pressure: ............. 10 bar

Max. differential

pressure: .................................. 0.5 bar

Setting range: ................. 0.05-0.5 bar

Test pressure: .......................... 16 bar

Max. flow

temperature: ............................. 90 °C.

120 °C (intermittent)

The AVDO automatic bypass control

valve is factory set to 0,2 bar (20 kPa).

The valve can be adjusted at the time of

installation to suit the central heating

system. A simple method of adjustment

is described in the next column.

VI.55.M7.02

8-1999

DKCD

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