BC-HM VI.72.M4.02 Danfoss 11/97 23
System 1-C - Hot-water-service storage tank with secondary mixing
Operating
Relay 1 Relay 2
condition
Standby 0 0
Reduced 0 time switch
Normal 1*) time switch
Frost 1 1
Control principle for 1-C
PI control of temperature at S1 in tap
circuit. Temperature held constant by
motor valve control M in secondary
circuit.
Note:
The relay status in different operating
conditions is shown in the table.
*
)
On changing over from normal to
reduced, R1 is delayed 3 minutes.
0 = open relay contact
1 = closed relay contact
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