Compensating And Auxiliary Variables; Heating Limit; Mode Of Operation Of Eco Function No. 1 - Siemens RVD110 Basic Documentation

Siemens Building Technologies
HVAC Products
Depending on the type of plant, "active" means:
Plant type no. Heating circuit pump Q1
1 OFF
2 OFF
3 OFF, ON for d.h.w.
charging
4 OFF
5 OFF
6 OFF
7 OFF
8 OFF
The heating circuit pump is deactivated. It can only be activated via frost protection for
the plant.
With the RVD110 / RVD130, the automatic ECO energy saver performs 2 part func-
tions. ECO function no. 1 is used especially in the summer. ECO function no. 2, re-
sponds mainly to short-term temperature changes and, therefore, is active during in-
termediate seasons.
With ECO, the heating system operates only or consumes energy only when required.
ECO can be deactivated, if required.

11.6.2 Compensating and auxiliary variables

Note: Also refer to section 11.2 "Compensating variables".
The automatic ECO energy saver requires an outside sensor. As compensating and
auxiliary variables it considers the progression of the outside temperature and the build-
ing's thermal storage capacity. The following variables are taken into account:
• The building time constant
• The actual outside temperature (T
• The attenuated outside temperature (T
ture, the attenuated outside temperature is considerably damped. It ensures summer
operation without heating because it makes certain the heating will not be switched
on if, for a few days, the outside temperature drops below a certain level
• Composite outside temperature (T
parison with the actual outside temperature, it reflects the effect of short-time outside
temperature variations on the room temperature as they often occur during interme-
diate seasons (spring and autumn)
The thermal inertia of the building in the case of outside temperature variations is taken
into account by including the composite outside temperature in the automatic ECO
energy saver.

11.6.3 Heating limit

ECO operates with a heating limit for which an ECO temperature can be set in the
range –10...+10 K (operating line 61). From this ECO temperature and the room tem-
perature setpoint, the heating limit will be calculated.
The switching differential of 1 K for switching on / off is entered as a fixed value.

11.6.4 Mode of operation of ECO function no. 1

ECO function no. 1 operates as an automatic summer / winter function. The heating will
be switched off (mixing valve closed and heating circulating pump deactivated) when
Basic Documentation RVD110, RVD130
11 Function block Space heating
Regulating unit heating circuit
CLOSED
CLOSED, OPEN for d.h.w.
charging
CLOSED, OPEN for d.h.w.
charging
CLOSED
CLOSED
CLOSED
CLOSED, OPEN for d.h.w.
charging
CLOSED
)
A
): Compared to the actual outside tempera-
AD
): Since this temperature is attenuated in com-
AM
Y...
Y1
Y1
Y1
Y1
Y1
Y1
Y1
Y5
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CE1P2381E
27.05.2004