Inputs and Outputs


Fig. 3.   CARE Icon


Table 10.   Inputs

Inputs

Functional description

Connection Signal Name

HeatDemandIn

heat demand input


BufUpperTemp

buffer upper temperature


BufMid1Temp

buffer middle temperature 1


BufMid2Temp

buffer middle temperature 2


BufMid3Temp

buffer middle temperature 3


BufLowerTemp

buffer lower temp


BufLoadLevel

Load buffer to sensor: 0 = BufUpperTemp;1 = BufMid1Temp; 2 = BufMid2Temp; 3 = BufMid3Temp; 4 = BufLowerTemp


ExtLoading

0 = no external loading; 1 = external loading


FilteredOATemp

outside air temperature



Table 11.   Outputs

Outputs

Functional description

Connection Signal Name

HeatDemandOut

heat demand output to the heating strategy


Buf_SpShift

buffer setpoint shift


EffLowerTemp

The value of the effective lower temperature; depends on the input “BufLoadLevel” and will be one of the middle or lower sensor.


ChargPumpEn

charging pump enable


ChgOverValve

changeover valve; 0 = buffer; 1 = boiler


BypassValve1

bypass valve 1; 0 = bypass; 1 = charge


BypassValve2

bypass valve 2; 0 = bypass; 1 = charge


BypassValve3

bypass valve 3; 0 = bypass; 1 = charge


BypassValve4

bypass valve 4; 0 = bypass; 1 = charge


BufOverheatAlm

buffer overheat alarm; 0 = normal; 1 = alarm


StopHighOATemp

stop buffer loading at high outside air temperatures


OperationMode

contains diagnostic information



Table 12.   Operation Mode

OperationMode

Function

Comments

1

buffer feed the system

Discharging control and “ChgOverValve1” = buffer

2

heat generator feeds the system

Discharging control and “ChgOverValve1” = boiler

3

buffer charging

Charging control and buffer charging; transmit heat demand to heat generator

4

buffer discharging

Charging control and buffer discharging

5

stop buffer loading at high outdoor temperatures

Charging control and (“BufUpperTemp” < OVHT-01 or “BufLowerTemp” > OVHT-02)

6

buffer overheat protection

“FilteredOATemp” > OAT-01