Baxi LUNA HT 280 Installers And Users Instructions page 27

17. Setting the boiler
parameters
The boiler parameters may only be modified by professionally qualified staff proceeding as follows:
a) press the , keys on the boilerʼs front panel together for about 3 s until the parameter H90 appears
on the display;
b) press the keys to select the parameter for modification;
c) press the and keys to modify the parameter;
d) press the key to exit the programming function.
e) when programming is finished, warning message E183 will blink for 3 seconds approx.
If the warning continues to blink or if other warnings are displayed, press the reset button
When warning message E153 appears, press the reset button a second time.
The following are the parameters generally used:
Parameter N. Description
Setting for domestic hot water reduced temperature (°C)
H90
S.H.W. (Sanitary Hot Water) program
Selecting the sanitary hot water program:
1 = S.H.W. production on 24 hours a day;
H91
0 = special program for sanitary hot water (program lines 31...36).
If the preheating function has been enabled (parameter H602=1440):
1 = preheating on 24 hours a day;
0 = preheating controlled by special S.H.W. program (program lines 31...36).
Only for plate type heat exchangers.
Economy function: allows the user to disable the preheating function while leaving
sanitary hot water production enabled (key 1 - figure 1; a line appears under the
H93
symbol).
0 = disabled
1 = enabled
Note: The economy function can only be used if the preheating function is enabled
(parameter H602 = 1440).
Maximum temperature (°C) of the central heating circuit HC1 corresponding to:
- the main circuit in systems with just one zone;
- the circuit of the zone where the QAA73 temperature control device is installed
H505
in case of systems with more than one high-temperature zone;
- the high temperature zone circuit in mixed systems and if the SIEMENS
AGU2.500 accessory is used.
Maximum temperature (°C) of the central heating circuit HC2 of a system with
more than one zone, corresponding to the circuit of the low-temperature zone if
H507
the SIEMENS AGU2.500 accessory is used.
Automatic Summer / Winter switching temperature (°C).
H516
Selection of temperature curve of central heating circuit HC1 (see Graph 1)
H532
Selection of temperature curve of central heating circuit HC2 (see Graph 1)
H533
Selection of central heating power (N. of fan rpm)
H536
Pump post-circulation time in central heating mode (min)
H544
Burner operating pause time between two start-ups (s)
H545
Hydraulic system setting (see instructions provided with the SIEMENS AGU2.500
H552
accessory)
Pump / three-way valve anti-blocking operating time (s)
H584
Heat exchanger preheating holding time after operation in domestic hot water
H602
mode (min)
Heat exchanger preheating holding time after operation in central heating mode
H603
(min)
Programmable function:
- "0" electricity supply to zone pump / valve and use of the SIEMENS AGU2.500
accessory;
- "1" electricity supply to a remote LPG gas valve;
H615
- "5" electricity supply to zone pump / valve in the absence of the SIEMENS
AGU2.500 accessory.
Only one of these functions can be selected.
H641
Fan post-purge interval (s)
27
Factory setting
10 or 35
1
0
80
70
20
15
15
See table 4
3
180
See table 4
10
0
0
5
10