Specifications

VMBMA602

ROOM

If you wish to increase or reduce the indoor temperature, change the ROOM value. The difference between changing the ROOM value and

the CURVE value is that the system’s heat curve does not become steeper or flatter if the ROOM value is changed, which the curve becomes

if the CURVE value changes, instead the entire heat curve is moved by 3°C for every degree change of the ROOM value. The reason that the

curve is adjusted 3° is that an approximate 3° increase in supply temperature is needed to increase the indoor temperature 1°.

Changing the ROOM value changes the heat curve upwards or downwards.Figure 85:

The relationship of the supply temperature to outdoor temperature will not be affected. The supply temperature will be increased or

reduced by the same number of degrees all along the heat curve. I.E. the entire heat curve rises or drops instead of the curve gradient

changing.

This method of adjusting the indoor temperatures can be used for a temporary raise or drop. For long term increases or reductions of the

indoor temperature, the heat curve is adjusted instead.

Sometimes,atoutdoortemperaturesbetween-5°Cand+5°C,partoftheheatcurvemayneedadjustingiftheindoortemperatureisnot

constant.Forthisreason,thecontrolsystemincludesafunctionadjustingthecurveatthreeoutdoortemperatures:-5°C,0°Cand+5°C.

This function will allow you to increase or reduce the supply temperature, without affecting the heat curve, at three specific outdoor tem-

peratures. If, for example, the outdoor temperature is -5°C, the supply temperature will change gradually between 0°C and -10°C, maximum

adjustment being reached at -5°C. The figure below displays the adjusted CURVE -5. The adjustment can be seen on the graph in the form

of a bump.

The adjusted curve at -5°C Figure 86:

Youcanchoosetoadjusttheheatcurveindividuallyatthreespecifiedoutdoortemperatures:-5°C,0°Cand+5°C.Thesupplytemperature

can be changed by plus/minus 5 degrees.

Supply temperature

Outdoor temperature

Maximum supply tem-

perature

Supply temperature

Outdoor temperature

Local higher supply tem-

perature at -5°