Manual Vaillant ecoTEC plus 937 (page 10 of 16) (English)

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Operating instructions ecoTEC plus 937 / 0020031573_0210

4.5 Heating operation

The boiler can only be used if the heating system has

water in it (see Section 4.2.2).

4.5.1 Setting the flow temperature

Fig. 4.11 Setting the flow temperature

Set the flow temperature by using the knob (1).

We recommend the following settings:

– Left-hand setting in Spring and Autumn,

– Mid-position setting in reasonably cold weather

– Right-hand setting in very cold weather

The set value is shown in the display (2) during the set-

ting process. After approx. 3 seconds the display returns

to standard mode (the current heating flow tempera-

ture).

Normally you can adjust the knob (1) continuously up to

a flow temperature of 75 °C.

However, if higher temperatures are required this can be

achieved by adjusting the boiler parameter d.71 (a quali-

fied installer should make this change) up to a maximum

of 85 °C.

4.5.2 Switching heating mode off (summer mode)

Fig. 4.12 Switching off heating (summer operation)

You can switch off the heating in summer without swit-

ching off the hot water supply.

• Turn the rotary knob (1) for setting the heating flow

temperature all the way to the left.

4.5.3 Setting a room thermostat or weather com-

pensator

Fig.4.13 Setting a room thermostat or weather compensator

• Adjust the room thermostat (1) and/or the radiator

thermostatic valves (2) in accordance with the opera-

ting instructions for these accessories.

Note

Vaillant supplies thermostats and time control-

lers which provide exact and economic room

temperature regulation for improved operating

convenience.

The boiler thus operates automatically according to the

set parameters for the heating system (the ecoTEC com-

bination boiler also provides hot water if required).

After operation is stopped the pump runs on for a short

period to allow the heat to be completely dissipated

from the unit.

Note

The boiler is fitted with a control unit which

prevents unnecessary and energy-wasting

short-term switching on and off. For this reason

there may be a slight delay when setting a hig-

her temperature on the thermostat before the

boiler switches on.

4.6 Status displays (for maintenance and servi-

cing by the engineer)

Fig. 4.14 Status displays

4 Operation

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Vaillant ecoTEC plus 937 Manual

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