22
Diagram 128: Heating circuit with burner demand, switchover to cooling
with cooler demand
The burner and the cooler demand are switched in a potential-free manner using 2 additional
auxiliary relays
HIREL-STAG
(special accessories).
Sensors:
S1
Room sensor RASPT or RAS
S2
External sensor
S3
Flow sensor
S4
Sensor in the buffer cylinder, only all programs
+2
S5
External switchover heating/cooling operation, only all programs
+1
S6
external burner or cooler demand, dependent on the S5 switch state, only all programs
+1
Outputs:
A1
Pump
A2 & A3
Mixer motor ON/OFF
COP 1
Burner demand 0V = OFF, 10V = ON
COP2
Cooler demand 0V = OFF, 10V = ON
Program 128:
The cooling operation functions only in combination with the RASPT or RAS room
sensor.
The operating mode is set using the room sensor with the aid of the slider switch:
Required settings:
Basic control level
Time
Parameter menu
Program number
PR
Heat curve
TEMP
or
R RISE
Flow maximum and minimum temperature
PRE
max,
PRE
min)
Parameter frost protection mode (
OTF
,
RTF
)
Set flow temperature for cooling operation
TNC
(fs = 18°C)
Menu Men
MIXER
(Room influence etc.) and
PUMP
(Switch off conditions)