COSMOGAS CSG 160

13 - USE

Outside temperature (°F)

Figure 13-2 - Graph of th e outdoor reset adj ustment

(influence of parameters “br”, “OA”, “Ob” and “Oc”)

13.10.6 – Outdoor reset with room compensation

While in the “Installers’ Menu” (section

13.17) set the parameter to 02.

The system will function exactly as described in the previous “Outdoor reset adjustment” sections except that now the boiler pump will stay on permanently. The opening of the room thermostat contacts will translate into a parallel downward movement of the curve in Figures 13-2 and 13-3.

The value by which the curve moves downwards can be adjusted by the

parameter present in the

“Installers’ Menu”, see section 13.17.

The parameter can range from 1 °F (1 °C) to 36 °F, (20°C). The suggested values for this parameter are:

- 18 °F (10°C) for high temperature radiator systems;

- 6 °F (3°C) for low temperature radiant panel systems

Values of this parameter that are too high may translate into room temperature instability. Values that are too low may make the action of the room thermostat ineffective.

Climatic adjustment with room compensation can be used in all the systems described in Section 13.10.1.

The advantage being that the constant running of the pump will stabilize and standardize the room temperatures.

This is especially true when some loops in the heating system have considerably greater volume than others.

Outside temperature (°F)

Figure 13-3 - Graphs of th e outdoor reset adj ustment

(influence of parameter “b”)

75

OA = Slope of the line

Ob = Minimum heating temperature

Oc = Maximum heating temperature br = “Fix point” of the angle fulcrum of the line b = parallel shift of the lin e

(adjusted by the heating knob, item “7” of figure 13-1)