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Service manual
Appendix
QAA 73 (Engineer Parameters)
Press and Hold program keys 1 (Down button) and 2 (Up button) for approx 5 secs. Ref Page 22
* Lines are only displayed if the unit is operating in Open Therm Plus mode and if the boiler controller supports its function.
For Access to the LMU level: Access QAA73 Engineer Parameters as detailed above
For Access to LMU Parameters (i.e Line 100 upwards)
Press and Hold program keys 1 (Down button) and 2 (Up button) for approx 10 secs
Parameter
Number
Description
Options / Range
Recommended
Default
Service Values
51
Current Room Temperature Set Point (Heating Zone 1)

#
52*
Current Room Temperature Set Point (Heating Zone 2)

#
53*
Outside Air Temperature (Attenuated)
-
#
54*
Outside Air Temperature (Composite)
-
#
55*
Actual Value of HWS

#
56*
HWS Flow Rate

#
57*
Actual Boiler Return Temperature
-
#
58*
Actual Flue Gas Temperature
-
#
59*
Actual Solar Panel Temperature
-
#
61*
Actual solar Storage Tank Temperature
-
#
62
QAA73 Communication Mode (Open Therm Mode)
Lite / Plus
Plus
Heating Zone Temperature Set Points
70
Compensation Curves Set Point for Time Switch 1

32
71
Minimum Boiler Flow Temperature for Time Switch 1

8
72
Maximum Boiler Flow Temperature for Time Switch 1

80
73
Compensation Slope Parallel Displacement for Time
Switch 1
-
0.0
74*
Build Construction Type
Heavy / Light
Light
75*
Influence of Room Temperature on Boiler Operation
None / HC1
On HC1
76
Pump Switching Differential

0.5
77
Compensation Slope Auto Adaptation
Inactive/Active
Inactive
78
Optimum Start Time Maximum Shift Limitation (Minutes)

100
79
Optimum Stop Time Maximum Shift Limitation (Minutes)

30
80*
Compensation Curves Set Point for Time Switch 2

0 (32 if AGU
used)
81*
Minimum Boiler Flow Temperature for Time Switch 2

8
82*
Maximum Boiler Flow Temperature for Time Switch 2

8 (80 if AGU
used)
83*
Compensation Slope Parallel Displacement for Time
Switch 2
-
0.0
HWS Set Points
90*
Reduced HWS Set Point

40
91
HWS Enable Switching
TSP DHW..
TSP DHW
92*
Anti Legionella Function (Monday Morning 2,5 Hours Max)
On
On
93*
Operating mode for HWS (Eco setting)
With Eco / Without
Eco
Without Eco
General
95
Operational Lock
Off / On
Off
96*
Clock Operation
QAA73 / Boiler
QAA73
97
Summer Time Start

25 March
98
Summer Time End

25 Oct
41


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