Setting The Boiler Parameters - Baxi HT 1.850 Installation, Operation And Maintenance Manual

14. SETTING THE BOILER PARAMETERS

The boiler parameters may only be modi ed by professionally quali ed staff proceeding as follows:
a) press the , keys on the boiler's front panel together for about 3 s until the parameter H90 appears on
the display;
b) press the keys to select the parameter for modi cation;
c) press the and keys to modify the parameter;
d) press the key to exit the programming function.
The following are the parameters generally used:
Parameter N.
Description
H90 Minimum D.H.W. temperature setting (°C).
D.H.W. activation program
H91
(0=active; 1=not active)
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 room temperature control device is installed in
H505
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
H507 zone, corresponding to the circuit of the low-temperature zone if the SIEMENS AGU2.500
accessory is used.
H516 Automatic Summer / Winter switching temperature (°C).
H532 Selection of temperature curve of central heating circuit HC1 (see Graph 1)
H533 Selection of temperature curve of central heating circuit HC2 (see Graph 1)
H608 PWM (%) Setting: Ignition load
H611 Speed setting (rpm) : Ignition load
H609 PWM Setting (%) : minimum power
H541-H610 PWM Setting (%) : maximum power Central heating / Domestic hot water
H612 Speed setting (rpm) : minimum power
H536-H613 Speed setting (rpm) : maximum power Central heating / Domestic hot water
H544 Pump post-circulation time in central heating mode (min)
H545 Burner operating pause time between two start-ups (s)
Hydraulic system setting (see instructions provided with the SIEMENS AGU2.500 accessory)
H552 H552 = 50 with AGU2.500 and with QAA73 + zones with room thermostat
H552 = 80 with RVA 47
Con guration of heating circuits
H553
H553 = 12 with AGU2.500
H615 Programmable function:
Con guration of system with supplementary pump
H632 = 00001111 with AGU2.500 and with QAA73 + zones with room thermostat
H632 = 00001111 with RVA 47
H632
The value of Bit could be 1 or 0.
Press the keys 5 and 6 to select the bit to modify (b0 is the bit on the right, b7 is the last bit on
the left).
To modify the Bit value press on the keys 7 and 8
H641 Fan overrun time setting (s)
Setpoint of autonomous ANTILEGIONELLA function
H657
60...80 °C = setting temperature range
0 = function inactive
If the electronic circuit board is replaced, make sure that the parameters set are those speci c to the boiler
model, as indicated in the documentation available from the authorised Service Centre.
ISTRUCTIONS PERTAINING TO THE INSTALLER
hydroheat.com.au
29
Factory setting
10
1
80
80
20
15
15
See
table 2
3
180
2
21
9
00001100
10
0
910.026.1 - EN (AUS)