Baxi LUNA HT 1.280, Installation, Operation And Maintenance Manual

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Fan shutdown for heating
mode
(2445)
This function is used for switching off the supply voltage for the fan. The supply
voltage for the fad is released as soon as the fan PWM actuation is active or a
DHW request exists. The switch off is done delayed to switch off of the PWM ac-
tuation or to discontinuation of the DHW request. The duration of the switch off
delay can be set with the fan switch off delay function (prog.no. 2446). During a
DHW request the voltage supply for the fan also remains then released if the
PWM actuation is not active.
Fan shutdown delay
(2446)
If no heating requirement exists the voltage supply of the fan is switched off. The
time is set here in which the fan gets voltage anyway.
Par controller delay
(2450)
The controller delay is used for a stabilisation of the combustion conditions, espe-
cially after a cold start. After release of the firing automation by the controller
this remains on the set output for a specified time. Only after this time has elap-
sed is the modulation released.
Prog. no. 2450 is used to set at which operating mode the controller delay is acti-
ve.
Speed controller delay
(2452)
Speed which is output during the duration of the control delay.
Controller delay duration
(2453)
Duration of the control delay. The time duration starts as soon as after ignition a
positive flame detection is done.
Switching diff on HCs
(2454)
Switching diff off min HCs
(2455)
Switching diff off max HCs
(2456)
Switching diff on DHW dura-
tion
(2460)
Switching diff off min DHW
(2461)
Switching diff off max DHW
(2462)
To avoid unnecessary switch off during transient effects the switch off difference
adapts dynamically depending on the temperature profile (see Fig. 22 ).
Fig. 22: Switching differential
Tc
t
Switching diff off
Tc (Current temperature)
Switching diff off
max HCs/DHW
(2456/2462)
Switching diff off
min HCs/DHW
(2456/2462)
Switching diff on
HCs/DHW duration
Programming
92 358 436 08.10