Vaillant Flue pipe Specifications download pdf (Page 31)

31Instructions for installation and servicing ecoTEC 839592_12

4.16 Thermostatic radiator valves

The boiler has a built in automatic by-pass valve making

it ideal for use in systems with thermostatic radiator

valves (no separate system by-pass is required). For

optimum fuel economy where TRV’s are used they must

be used in conjunction with a boiler control interlock. A

programmable room thermostat or separate timer and

room thermostat will ensure complete boiler shut down

when the heating demand is satisfied. (The radiator in

the room containing the room thermostat should not be

fitted with a TRV).

4.17 Frost protection

The boiler has an integral frost thermostat which is

designed for protection of the boiler. To protect remote

or exposed parts of the heating system or property

additional frost protection measures must be taken such

as the installation of an external frost thermostat. This

frost thermostat should be connected across the boiler

terminals 3 and 4, in parallel with any external heating

controls.

Note

External frost protection cannot be used when

plug in timers are utilised.

4.18 Circulating pump

The boiler incorporates a built in circulating pump that

is fully prewired (no additional wiring is necessary). The

pump incorporates an automatic overrun period after

the boiler switches off.

4.19 Anticycling ‘economiser’ control

The boiler incorporates a built in anticycling control to

ensure that energy wasteful short cycling of the boiler

cannot occur. This control prevents the boiler from

reigniting for a preset period after central heating

operation (the hot water operation is unaffected by this

control and hot water can be drawn at any time).

Note

To temporarily override the anticycling control

turn the main boiler on/off switch to the off

position “0” and then back to the on position

“I” after a few seconds.

4.20 Automatic pump spin control (APS)

The boiler incorporates a built in control which will spin

the built in circulating pump and operate the diverter

valve (ecoTEC combination boilers only) once in a

23 hour period. This control helps to prevent seizure

when the boiler is not operated for a period of time.

This control is not active when the power supply to the

appliance is turned off.

Boiler installation sequence 4

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 63 64

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Vaillant Flue pipe Specifications Page 31

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