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Siemens Building Technologies
Basic Documentation QAA73.110 Room unit
CE1P2284en
HVAC Products
Description
of the heating engineer settings
10.07.2002
4.19 Maximum forward shift for optimum start
control
Maximum forward shift is a limit function for limiting the switch-on point with optimum
start control. It is active only when room influence is used.
1. Press the line selection buttons to select line 78.
2. Press the + / – buttons to select the type of building construction.
Setting range
Unit
Factory setting
0 ... 360
min
100
0
Optimum start control switched off
10 ... 360
Optimum start control switched on
Optimum start control acts according to line
75
”Room influence”.
The maximum forward shift for optimum start control can be set between 0 and 360
minutes. Setting 0 means that optimum stop control is deactivated.
During non-occupancy hours, the heating is maintained at the reduced level. Towards
the end of the setback period, optimization switches the control back to the nominal
temperature level.
Optimization calculates the changeover time such that, at the start of occupancy, the
room temperature will have reached the nominal setpoint.
The switch-on point for the heating system (change to the nominal temperature level) is
selected such that, at the start of occupancy according to the heating program, the
room temperature reached will be the setpoint minus 0.25 K.
Optimum start control only acts on the first occupancy period of the day.
4.20 Maximum forward shift for optimum stop
control
Maximum forward shift is a limit function for limiting the switch-off point with optimum
stop control. It is active only when room influence is used.
1. Press the line selection buttons to select line 79.
2. Press the + / – buttons to select the type of building construction.
Setting range
Unit
Factory setting
0 ... 360
min
30
0
Optimum stop control deactivated
10 ... 360
Optimum stop control activated
Optimum stop control acts according to line 75 ”Room influence”.
The maximum forward shift for optimum stop control can be set between 0 and 360
minutes. Setting 0 means that optimum stop control is deactivated.
Description
Line 78
Effect
Note
Optimum start control
Note
Description
Line 79
Effect
Note
optimum stop control