Table of Contents
Advertisement
15 TEMPERATURE PROTECTION
The difference between Supply temperature and Inlet Temperature is continuously monitored. A too big difference
can indicate a defective pump or a clogged heat exchanger. To protect the water heater, the burner controller re-
duces the input when the temperature difference ΔT becomes too high:
At maximum water heater input ΔT is limited to 18 °C
In between 18 °C and 26 °C water heater input modulates between minimum and maximum.
At minimum water heater input ΔT above 26 °C
Above ΔT = 31 °C, the water heater is switched OFF during HX_Diff_Max_Wait_Time.
Relevant factory set variables
Parameter
HX Diff Delta T Min
HX Diff Max Wait Time
Wait time after upper limit primary heat exchanger
differential has been exceeded.
120
High power
100
80
60
40
20
0
10
15
16 ERROR INFORMATION.
Errors can be divided in three groups:
• Non-volatile locking errors (can only be reset by the reset button).
• Blocking errors (will disappear when error is gone)
• Warnings (will disappear when the warning is gone, not stored in the BCU)
The water heater pump will continue to run during most locking and blocking error codes. This is to prevent the
freezing of the Heating circuit when the water heater is in error during the winter period. For some non-volatile
lockouts the pump will not be running, also see the error tables in this chapter for more details.
Water heater history.
The last 15 lockouts and 15 blocking errors are stored in the water heater control. This water heater history can be
shown via the Water heater History screen via the installer water heater status menu in one of the advanced dis-
plays.
•
Successful ignitions
•
Failed ignitions
•
Flame failures
•
Anti-legionella count
Boiler input control
Low power
18
26
20
25
Delta T [°C]
•
Total system run time
•
CH Burner hours
•
DHW burner hours
•
E93.1804.014
Level
3: Factory
3: Factory
Boiler Off
31
30
35
40
Factory Setting.
18 ºC
0 Sec.
95
Advertisement
Table of Contents
